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Debt Instrument, Covenant, Unrestricted Cash Requirement Restricted cash amount requirement Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] Supplemental Cash Flow Information [Abstract] Supplemental cash flow information: Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and other intangible assets Equity Securities without Readily Determinable Fair Value, Amount Investments Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2029 Unsecured Fixed Rate Notes 4.625 Percent Due March 2028 [Member] Unsecured Fixed Rate Notes 4.625 Percent Due March 2028 [Member] Unsecured notes bearing fixed rate interest at 4.625% due March 2028 Operating Lease, Right-of-Use Asset Right-of-use assets for operating leases Right-of-use assets for operating leases Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Deferred Tax Assets, Gross Total deferred tax assets Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block] Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Total reclassifications, before tax Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to redeemable noncontrolling interest Net loss attributable to the noncontrolling interest Schedule Of Share Based Compensation Restricted Stock Award Activity [Table Text Block] Schedule of share based compensation restricted stock award activity. Schedule of RSAs Activity Land Land Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Change in operating assets and liabilities, net of acquisitions: Document Type Document Type Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and indefinite-lived intangible assets Income Taxes Paid, Net Cash paid for income taxes, net of refunds Total Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Cash Surrender Value of Life Insurance Cash value life insurance Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Entity Central Index Key Entity Central Index Key Accounts Receivable, Allowance for Credit Loss, Current Allowance for doubtful accounts receivable Termination fee to be received Business Combination Termination Fee To Be Received Business combination termination fee to be received. 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Syndication expense Licensing Agreements, With Limited Headroom Licensing Agreements, With Limited Headroom [Member] FCC licenses which have experienced limited headroom Line of Credit Facility, Remaining Borrowing Capacity Unused borrowing capacity Investment, Name [Domain] Investment, Name [Domain] Preferred Stock, Shares Outstanding Preferred stock, outstanding (in shares) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to TEGNA Inc. Common Stock, Capital Shares Reserved for Future Issuance Shares reserved for issuance (in shares) Defined Benefit Plan, Cash and Cash Equivalents [Member] Cash Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Effect of dilutive securities (in shares) Defined Benefit Plan, Assumptions [Table Text Block] Schedule of Assumptions Used Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Proceeds from Sale of Equity Method Investments Proceeds from sale of equity method investment State taxes (net of federal income tax benefit), Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Other, Amount Stock Issued During Period, Value, Stock Options Exercised Stock-based awards activity Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Liabilities and Assets Debt Instrument, Unamortized Discount (Premium), Net Unamortized premiums and discounts, net Unamortized premiums Performance Shares [Member] Performance share awards PSAs Long-Term Debt, Fair Value Fair value of total long-term debt Subsequent Event [Member] Subsequent Event Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Total reclassifications, net of tax Amounts classified from AOCL The amount of non cash pension (benefit) expense reduced by the amounts of cash and cash equivalents contributed during the reporting period by the entity to fund its pension plans. Pension Benefit Expense Net Of Pension Contributions Pension expense, net of employer contributions Other Assets, Noncurrent Other long-term assets Gain (Loss) on Contract Termination Merger termination fee Merger termination fee Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Award vesting percentage Basis of Presentation and Significant Accounting Policies [Text Block] Description of business, use of estimates, basis of presentation, and summary of significant accounting policies Debt investment Debt Securities Debt Securities, Total Programming Contracts [Member] Programming Contracts [Member] Programming Contracts Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Share-Based Payment Arrangement, Expense, after Tax Employee awards stock-based compensation net of tax State and Local Jurisdiction [Member] State Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Schedule of Stock-Based Compensation Related Amounts Recognized in the Consolidated Statements of Income for Equity Awards Related Party Transaction [Axis] Related Party Transaction [Axis] Total Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Customer [Domain] Customer [Domain] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Future funding commitments Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Treasury Stock, Common, Shares Treasury stock (in shares) Finite-Lived Intangible Asset, Expected Amortization, after Year Five Thereafter Increase (Decrease) in Stockholders' Equity [Roll Forward] TEGNA Inc. Shareholders’ Equity Advertising [Member] Advertising Investments and Other Noncurrent Assets [Text Block] Investments and other assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Intangible assets related to acquired technology and customer relationships Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred Selling, General and Administrative Expense Business units - Selling, general and administrative expenses Defined Benefit Plan, Equity Securities [Member] Corporate stock Equity securities Minimum [Member] Minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Granted (in dollars per share) Financial Instrument [Axis] Assets, Current [Abstract] Current assets Other Comprehensive Income (Loss), Tax Income tax effect related to components of other comprehensive income Recorded Unconditional Purchase Obligation [Table] Recorded Unconditional Purchase Obligation [Table] Multiemployer Plan, Employer Contribution, Cost Contribution by employer Amortization of Intangible Assets Amortization of intangible assets Amortization of intangible assets Fair Value, Inputs, Level 3 [Member] Level 3 Income Tax Expense (Benefit), Continuing Operations [Abstract] Total Deferred Tax Liabilities, Property, Plant and Equipment Accelerated depreciation Business Combination [Policy Text Block] Terminated Merger Agreement Gain on investment sales Unrealized Gain (Loss) on Investments Share Based Compensation Arrangement By Share Based Payment Award Incentive Period Share Based Compensation Arrangement By Share Based Payment Award Incentive Period Incentive period Liabilities, Current [Abstract] Current liabilities Deferred Tax Asset, Valuation Allowance, Additions Deferred Tax Asset, Valuation Allowance, Additions Additions to valuation allowance Deferred compensation assets Deferred Compensation Plan Assets Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts receivable Accounts receivable, net of allowances of $3,510 and $2,831, respectively Prepaid Expense, Noncurrent Prepaid Expense, Noncurrent, Total Prepaid assets Commitments and Contingencies Commitments and contingent liabilities (see Note 11) Defined Benefit Plan, Service Cost Service cost-benefits earned during the period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Unvested at end of year (in dollars per share) Unvested at beginning of year (in dollars per share) Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Merger Agreement [Member] Merger Agreement. Merger Agreement All Other Segment Expense Items all other segment expense items. Less: All other segment items Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Indefinite-Lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Less: Reconciling Items [Abstract] Reconciling items. Operating Lease, Liability Present value of lease liabilities Total operating lease liabilities Unfunded Commitments Related to Funds Unfunded commitments related to funds. Unfunded commitments related funds Goodwill, Purchase Accounting Adjustments Adjustments Auditor Firm ID Auditor Firm ID Effective Income Tax Rate Reconciliation, Nondeductible Expense, Transaction Costs Effective income tax rate reconciliation, nondeductible expense, transaction costs. Non-deductible transaction costs, Amount Treasury Stock, Carrying Basis Carrying value of common stock Scenario Forecast Forecast [Member] Syndication assets Syndication Assets Syndication assets. Equity Securities, FV-NI, Cost Other equity investments Equity And Debt Investment [Member] Equity And Debt Investment [Member] Equity And Debt Investment Bridge Loan Bridge Loan [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Debt Issuance Costs, Noncurrent, Net Deferred financing costs Long-Term Debt, Maturity, Year Two 2027 Effective Income Tax Rate Reconciliation, Nondeductible Expense, Transaction Costs, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Transaction Costs, Percent Non-deductible transaction costs, Percent Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Other valuation allowances, tax rate changes, & deferred adjustments Changes in valuation allowances, Percent Liabilities, Noncurrent [Abstract] Noncurrent liabilities Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income Accrued Income Taxes, Current Income taxes payable Pension settlement charge Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Debt instrument, covenant, springing maturity threshold. Debt Instrument, Covenant, Springing Maturity Threshold Springing maturity threshold Long-Term Debt, Type [Domain] Long-term Debt, Type [Domain] Deferred Tax Asset, Valuation Allowance, Reductions Deferred Tax Assets, Valuation Allowance, Reductions Reductions to valuation allowance Cybersecurity Risk Management Positions or Committees Responsible [Text Block] Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted average number of common shares outstanding - basic (in shares) Scenario [Axis] Advertising And Marketing Services [Member] Advertising And Marketing Services [Member] Advertising & Marketing Services Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Change in plan assets Stockholders' Equity, Other Other activity Other Revenue Source [Member] Other Revenue Source [Member] Other Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Reconciliation of Effective Tax Rate Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Fair Value Measured at Net Asset Value Per Share [Member] Fair Value Measured at Net Asset Value Per Share Merger Agreement Merger Agreement [Policy Text Block] Merger Agreement. Long-Lived Tangible Asset [Domain] Property, Plant and Equipment, Type [Domain] Auditor Information [Abstract] Auditor Information [Abstract] Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] Deferred Tax Assets, Net [Abstract] Deferred tax assets Subsequent Events [Text Block] Subsequent Events Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash Company stock 401(k) match contributions Long-Term Debt Total long-term debt Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Fair Value, Inputs, Level 1, 2 and 3 Program Rights Assets, Expense Program Rights Assets, Expense Programming expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Employee stock-based compensation awards Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Actuarial (loss) gain Actuarial (gain) loss Actuarial loss (gain) Actuarial loss (gain) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Changes in valuation allowances, Amount Equity, Attributable to Parent Equity, Attributable to Parent, Total Beginning balance Ending balance Payments to Acquire Investments Payments for investments Basis of Accounting, Policy [Policy Text Block] Basis of presentation Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Equity Method Investments Equity method investments Use of Estimates, Policy [Policy Text Block] Use of estimates Credit Loss, Financial Instrument [Policy Text Block] Trade receivables and allowances for doubtful accounts Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Actuarial gain (loss) arising during the period Current year net actuarial (loss)/gain Treasury Stock, Common [Member] Treasury stock Long-Term Debt, Maturity, Year Five 2030 Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Fair Value Disclosures [Text Block] Fair value measurement Amended And Restated Competitive Advance And Revolving Credit Agreement [Member] Amended And Restated Competitive Advance And Revolving Credit Agreement [Member] Amended and Restated Competitive Advance and Revolving Credit Agreement Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Retirement Plans Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Deferred Tax Assets, Operating Lease, Liabilities Deferred Tax Assets, Operating Lease, Liabilities Operating lease liabilities Income (Loss) from Equity Method Investments Equity loss in unconsolidated investments, net Equity loss in unconsolidated investments, net Programming Rights, Current Programming Rights, Current Syndicated programming rights Long-Term Debt, Maturity, Year Four 2029 Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Activity Related to Unrecognized Tax Benefits, Excluding Federal Tax Benefit of State Tax Deductions Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Other Pension, Postretirement and Supplemental Plans [Member] All other Accelerated Share Repurchase Program (ASR) Accelerated Share Repurchase Program (ASR) [Member] Accelerated Share Repurchase Program (ASR) Recorded Unconditional Purchase Obligation, Category [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Entity [Domain] Entity [Domain] Temporary Equity, Including Noncontrolling Interest Ending balance Beginning balance Redeemable noncontrolling interest (see Note 1) Credit Facility [Axis] Credit Facility [Axis] Cost of Product and Service Sold Cost of revenues Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] Comprehensive Income (Loss) [Table] Comprehensive Income Loss [Table] Comprehensive Income (Loss) [Table] Current State and Local Tax Expense (Benefit) State and other Schedule of Expected Benefit Payments [Table Text Block] Schedule of Expected Benefit Payments Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Contributions expected to be made during next fiscal year Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Schedule of Facility Consolidation and Asset Impairment Charges Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Cash Payments Related Party, Type [Axis] Related Party, Type [Axis] Other adjustments, Amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Customer Two Customer Two [Member] Customer Two Pension Plan [Member] Retirement Plans Property, Plant and Equipment, Policy [Policy Text Block] Property and equipment Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Percent Purchase of clean energy federal tax credits, Percent Purchase of clean energy federal tax credits, Percent Entity Address, City or Town Entity Address, City or Town Debt [Member] Debt Investment Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Recorded gains Number of Reportable Segments Number of reportable segments Business Combination Share Converted Amount Business combination share converted amount. Share converted amount, per share Security Exchange Name Security Exchange Name Defined Benefit Plan, Benefit Obligation, Change In Discount Rate, Actuarial Gain (Loss) Defined Benefit Plan, Benefit Obligation, Change In Discount Rate, Actuarial Gain (Loss) Actuarial gain (losses) from change in discount rate Credit Facility [Domain] Credit Facility [Domain] Indefinite-Lived Intangible Assets (Excluding Goodwill) Television and radio station FCC broadcast licenses Redeemable Noncontrolling Interest, Equity, Carrying Amount Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total Redemption of noncontrolling interest Stock-based awards activity Adjustments to Additional Paid in Capital Stock Based Awards Activity Adjustments to additional paid in capital stock based awards activity. Long-Term Debt, Gross Total principal long-term debt Total Unsecured notes Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Other adjustments, Percent Property, Plant and Equipment, Gross Total Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Counterparty Name [Axis] Counterparty Name [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Loss Contingency, Number Of Codefendants Loss Contingency, Number Of Codefendants Number of co defendants Recorded Unconditional Purchase Obligation, to be Paid, Year Two 2027 Unsecured Fixed Rate Notes 4.750 Percent Due March 2026 Unsecured Fixed Rate Notes 4.750 Percent Due March 2026 [Member] Unsecured notes bearing fixed rate interest at 4.75% due March 2026 Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Balance of cash and cash equivalents at end of year Balance of cash and cash equivalents at beginning of year Interest Paid, Excluding Capitalized Interest, Operating Activity Cash paid for interest Measurement Basis [Axis] Measurement Basis [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Assets, Current Total current assets Share-Based Payment Arrangement, Expense Stock-based compensation Document Period End Date Document Period End Date Title of Individual [Axis] Deferred Compensation Arrangement with Individual, Share-based Payments, by Title of Individual [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Defined Contribution Plan, Cost Compensation expense related to 401(k) contributions ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Impairment of indefinite-lived intangible assets Defined Benefit Plan, Benefit Obligation, Benefits Paid Benefits paid Number Of Radio Stations Number Of Radio Stations Number of radio stations Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets Fair value of plan assets Long-Term Debt [Text Block] Long-term debt Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Reporting unit, percentage of fair value in excess of carrying amount Effective tax rate portion in state and local income taxes, percent Effective Tax Rate Portion In State and Local Income Taxes, Percent Effective tax rate portion in state and local income taxes, percent. Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Restricted Stock Units (RSUs) [Member] RSU Program RSUs Line of Credit [Member] Line of Credit Defined Benefit Plan, Actual Return on Plan Assets Percentage Defined Benefit Plan Actual Return On Plan Assets Percentage Actual rate of return on plan assets (as a percent) Finite-Lived Intangible Assets, Decrease In Accumulated Amortization Finite-Lived Intangible Assets, Decrease In Accumulated Amortization Decrease In accumulated amortization Deferred Tax Liabilities, Net Total net deferred tax liabilities Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Current Income Tax Expense (Benefit) Total Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Fair value of plan assets Cybersecurity Risk Management, Strategy, and Governance [Line Items] Liabilities Total liabilities Financial Instruments [Domain] Income (Loss) Attributable to Parent, before Tax Income before income taxes Income before income taxes Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Requisite service period Teton Parent Corp Teton Parent Corp [Member] Teton Parent Corp Clay, Massey & Associates, P.C. v. Gray Television [Member] Clay, Massey & Associates, P.C. v. Gray Television [Member] Clay, Massey & Associates, P.C. v. Gray Television Defined Benefit Plan, Expected Return (Loss) on Plan Assets Expected return on plan assets Lessee, Operating Lease, Liability, to be Paid, Year Two 2027 Restricted Stock [Member] Restricted stock units Indefinite-Lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Gross Gross Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average number of common shares outstanding - diluted (in shares) Entity File Number Entity File Number Payments of Ordinary Dividends, Common Stock Dividends paid Revenue, Performance Obligation, Description of Timing Submission period for customers to submit payments Cover [Abstract] Cover [Abstract] Sum of the carrying amounts as of the balance sheet date of goodwill, indefinite-lived and amortizable intangible assets, less accumulated amortization, deferred income taxes, and investments and other assets. Intangible Assets And Other Assets Noncurrent Total intangible and other assets Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Cancelled (in shares) Reclassification from AOCI, Current Period, Tax Income tax effect Revenue Benchmark [Member] Sales Revenue MadHive Inc MadHive Inc [Member] MadHive Inc Scenario [Domain] Liability, Defined Benefit Pension Plan, Noncurrent Pension liabilities Pension liabilities—non-current Number of Operating Segments Number of operating segments Lessee, Operating Leases, Assets And Liabilities, [Table Text Block] Lessee, Operating Leases, Assets And Liabilities, [Table Text Block] Schedule of Lessee, Operating Leases, Assets and Liabilities General and Administrative Expense Corporate - General and administrative expenses Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Machinery and Equipment, Gross Equipment, furniture and fixtures Defined Benefit Plan, Lump-sum Payment Charge Defined Benefit Plan, Lump-sum Payment Charge Pension settlement charge Subsequent Event [Table] Subsequent Event [Table] Nexstar Media Group, Inc [Member] Nexstar Media Group, Inc. Nexstar Media Group, Inc Deferred Tax Assets, Other Other Share repurchase program expiration date Share Repurchase Program, Expiration Date Transmission Service Agreement [Member] Retransmission agreements Finite-Lived Intangible Assets, Net Total Equity Method Investment, Realized Gain (Loss) on Disposal After-tax gain on sale of equity method investment Intangible Assets, Gross (Excluding Goodwill) Total indefinite-lived and amortizable intangible assets, gross Operating Lease, Expense Lease expense Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Property, Plant and Equipment, Useful Life Property, plant and equipment, useful life (in years) New Accounting Pronouncements, Policy [Policy Text Block] Accounting guidance adopted in 2025 and New accounting guidance not yet adopted Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Schedule of Future Rent Payments on Lease Liabilities Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Equity investments, impairment loss Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of Restricted Stock and RSU Awards Unrecognized Tax Benefits, Period Increase (Decrease), Percent Unrecognized tax benefits, period increase (decrease), percent. Changes in unrecognized tax benefits, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Other, Percent Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Award vesting period Recorded Unconditional Purchase Obligation, to be Paid, Year Four 2029 Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease), Total Changes in unrecognized tax benefits, Amount Depreciation Depreciation Depreciation Other Receivables, Net, Current Other receivables Lessee, Operating Lease, Term of Contract Remaining lease term Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Actual allocation of Plan Assets Common Stock, Shares, Outstanding Common stock, outstanding (in shares) Operating Lease, Liability, Current Operating lease liabilities (current) Debt instrument, covenant, leverage ratio, step-up. Debt Instrument, Covenant, Leverage Ratio, Step-Up Leverage ratio, step-up Number of Television Stations Number Of Television Stations Number of television stations Investment One Investment One [Member] Investment One Number Of Agreements Terminated Number of agreements terminated. Number of agreements terminated Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service cost Cybersecurity Risk Management Processes Integrated [Flag] Document Transition Report Document Transition Report Accrued Liabilities, Current [Abstract] Accrued liabilities Asset Impairment Charges Asset impairment charges Total asset impairment and other Asset impairment and other (see Note 10) Lessee, Operating Leases [Text Block] Leases Payments for Repurchase of Common Stock Repurchase of Common Stock Litigation Status [Axis] Litigation Status [Axis] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Provision (Benefit) for Income Taxes on Income Consists Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Deferred Tax Liabilities, Operating Lease, Right of Use Assets Deferred Tax Liabilities, Operating Lease, Right of Use Assets Right-of-use assets for operating leases Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average fair value Weighted average fair value Current Federal Tax Expense (Benefit) Federal Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Non-deductible officers' compensation, Percent Payments to Acquire Businesses, Net of Cash Acquired Payments for acquisitions of businesses and assets, net of cash acquired Other comprehensive income (loss) pension and other postretirement benefit plans other adjustments before tax. Other Comprehensive Income (Loss) Pension and Other Postretirement Benefit Plans Other Adjustments Before Tax Pension settlement charge Equity [Text Block] Shareholders' equity Pension and Other Postretirement Plans, Policy [Policy Text Block] Retirement plans Weighted Average Number Of Common Shares Outstanding: Weighted Average Number Of Common Shares Outstanding [Abstract] Weighted average number of common shares outstanding: Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits that, if recognized, would impact effective tax rate Deferred Tax Liabilities, Other Other Cybersecurity Risk Management Processes Integrated [Text Block] Net income attributable to TEGNA Inc. Net (loss) income Long-Term Purchase Commitment, Amount Purchase commitments under contract Recorded Unconditional Purchase Obligation, to be Paid, Year Three 2028 Earnout Payment Earnout payment. Treasury Stock, Shares, declined Treasury Stock, Shares, declined Treasury shares declined Intangible Assets, Net (Excluding Goodwill) Total indefinite-lived and amortizable intangible assets, net Indefinite-lived and amortizable intangible assets, less accumulated amortization of $220,522 and $185,175, respectively Litigation Settlement, Amount Awarded to Other Party Settlement amount Distribution [Member] Distribution. Distribution Operating Lease, Payments Cash payments for operating leases Assets [Abstract] ASSETS Assets Total Investments and Other Noncurrent Assets Investments and other assets Recorded Unconditional Purchase Obligation, to be Paid, Year One 2026 Debt repayment Repayments of Debt Amortization of Debt Issuance Costs and Discounts Amortization of deferred financing costs, debt discounts and premiums Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Loss Increase (Decrease) in Temporary Equity [Roll Forward] Redeemable noncontrolling interest Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash flows from investing activities: Retirement Benefits [Abstract] Retirement Benefits [Abstract] Accounts Payable, Current Accounts payable Interest Expense, Nonoperating Interest Expense, Nonoperating, Total Interest expense Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Reductions due to lapse of statutes of limitations Program Rights Obligations, Current Contracts payable for programming rights Deferred Federal Income Tax Expense (Benefit) Federal Repurchase of noncontrolling interest in Premion Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Repurchase of noncontrolling interest in Premion Redemption of noncontrolling interest Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Amortization of prior service (credit) cost, net Finite-Lived Intangible Asset, Expected Amortization, Year One 2026 Defined Benefit Plan, Debt Security [Member] Debt securities Defined Benefit Plan, Plan Assets, Payment for Settlement Pension settlements Private Equity Funds [Member] Partnership/joint venture interests Schedule of Other Assets [Table Text Block] Schedule of Other Assets Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Change in unrecognized tax benefits Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2026 Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Deferred Debt Issuance Cost, Writeoff Unamortized debt issuance costs Net Income (Loss) Available to Common Stockholders, Basic Earnings available to common shareholders Multiemployer Plan, Pension, Insignificant, Employer Contribution under Collective-Bargaining Arrangement to Total Employer Contribution, Percentage CBA contribution as a percent of total contribution Increase (Decrease) In Accrued Interest And Taxes Increase (Decrease) In Accrued Interest And Taxes Decrease in interest and taxes payable, net (Decrease) increase in interest and taxes payable Payment for Contingent Consideration Liability, Financing Activities Payments for acquisition-related earnout consideration Debt Instrument [Axis] Debt Instrument [Axis] Lessee, Operating Lease, Liability, to be Paid, after Year Five Thereafter Defined Benefit Plan, Interest Cost Interest cost on benefit obligation Interest cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized compensation cost related to unvested share-based compensation Debt instrument, covenant, springing maturity, term. Debt Instrument, Covenant, Springing Maturity, Term Springing maturity, term Gain loss on termination of business acquisition. Gain (Loss) On Termination Of Business Acquisition Gain on termination of business acquisition Merger termination fee Unusual or Infrequent Items, or Both, Disclosure [Text Block] Asset impairment and other Concentration Risk, Percentage Percentage of revenue Defined Benefit Plan, Expected Future Benefit Payment, Year One 2026 Revenues Revenues Revenues, Total Revenue Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net cash flow (used for) provided by investing activities Title of 12(b) Security Title of 12(b) Security December2023 Share Repurchase Program. December 2023 Share Repurchase Program [Member] December 2023 Share Repurchase Program Unusual or Infrequent Items, or Both [Abstract] Unusual or Infrequent Items, or Both [Abstract] Non-deductible officers' compensation, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Cancelled (in dollars per share) Related Party, Type [Domain] Related Party, Type [Domain] Long-Term Debt, Maturity, after Year Five Thereafter Income Tax Disclosure [Text Block] Income taxes Effective Income Tax Rate Reconciliation Non Taxable Merger Termination Fee Amount Effective income tax rate reconciliation non taxable merger termination fee amount. Non-taxable Merger termination fee, Amount Cash and U.S. Government Securities [Member] Cash and U.S. Government Securities. Cash and U.S. Government Securities Pension Plans Fair Value Of Investments [Table Text Block] Pension Plans Fair Value Of Investments [Table Text Block] Schedule of Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy Other Liabilities, Noncurrent Other noncurrent liabilities Legal Entity [Axis] Legal Entity [Axis] Reconciliation of Revenue from Segments to Consolidated [Table] Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Schedule of Net Periodic Benefit Cost Not Yet Recognized Letters of credit outstanding Letters of Credit Outstanding, Amount Defined Benefit Plan, Plan Assets, Amount Fair value of plan assets as of end of year Fair value of plan assets as of beginning of year Fair Value of Plan Assets Total fair value of plan assets Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Number of Markets In Which Entity Operates Number of Markets In Which Entity Operates Number of markets In which entity operates Unrecognized Tax Benefits Balance as of end of year Balance at beginning of year Additional Paid-in Capital [Member] Additional paid-in capital Stock Repurchase Program, Authorized Amount Shares approved to be repurchased under share repurchase program, amount (up to) Income Statement Location [Axis] Income Statement Location [Axis] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Senior Notes [Member] Senior Notes Trading Symbol Trading Symbol Subsequent Event Type [Axis] Subsequent Event Type [Axis] Employee-related Liabilities, Current Compensation Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows from financing activities: Lessee, Operating Lease, Liability, to be Paid Total lease payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: amount of lease payments representing interest Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Equity Components [Axis] Equity Components [Axis] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Change in benefit obligations Accounts Payable Accounts payable Nonoperating Income (Expense) Total Equity Component [Domain] Equity Component [Domain] Restricted Stock and Restricted Stock Units [Member] Restricted Stock And Restricted Stock Units [Member] RSUs Restricted Stock and Restricted Stock Units Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Schedule of Reconciliations Between Revenue and the Primary Measures of Profit or Loss and Include our Significant Expense Measures Document Annual Report Document Annual Report Business Combination [Axis] Business Acquisition [Axis] Employee [Member] Employee [Member] Employee Machinery and Equipment [Member] Machinery, Equipment, and Fixtures Customer [Axis] Customer [Axis] Building and Building Improvements [Member] Building and Improvements Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Octillion Media [Member] Octillion Media. Octillion Media Maximum [Member] Maximum Statistical Measurement [Axis] Statistical Measurement [Axis] Finite-Lived Intangible Assets, Accumulated Amortization Accumulated amortization Accumulated Amortization Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Pension and post-retirement medical and life Common Stock, Value, Issued Common stock of $1 par value per share, 800,000,000 shares authorized, 168,168,632 and 324,418,632 shares issued, respectively Reduction in earnout liability Reduction in earnout liability. Line of Credit Facility, Expiration Date Line of credit facility, expiration date Litigation Status [Domain] Litigation Status [Domain] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of Reclassification out of Accumulated Other Comprehensive Loss Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Total equity Adjustment for working capital and maximum earnout Adjustment for working capital and maximum earnout. Adjustment for working capital and maximum earnout Deferred Tax Assets, Operating Loss Carryforwards Loss carryforwards Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Valuation of long-lived assets Intangible Contract Asset Intangible Contract Asset [Member] Intangible Contract Asset Broadcast Music Inc. Broadcast Music Inc [Member] Broadcast Music Inc Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent State taxes (net of federal income tax benefit), Percent Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Unsecured Fixed Rate Notes 7.75 Percent Due June 2027 [Member] Unsecured Fixed Rate Notes 7.75 Percent Due June 2027 [Member] Unsecured notes bearing fixed rate interest at 7.75% due June 2027 Entity Public Float Entity Public Float Loss Contingency, Number of Defendants Number of other broadcasters settling DOJ complaint (defendant) Preferred Stock, Shares Authorized Preferred stock, authorized (in shares) Interest Payable, Current Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss (gain) attributable to redeemable noncontrolling interest Costs and Expenses Total Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Debt [Table Text Block] Schedule of Long-Term Debt Payments for tax withholding related to vested stock-based compensation awards and share repurchase excise tax Payment, Tax Withholding, Share-Based Payment Arrangement Temporary Equity, Accretion to Redemption Value, Adjustment Adjustment of redeemable noncontrolling interest to redemption value Market Reach Number Of People Market reach number of people. Market reach, number of people Business Combination [Table] Entity Registrant Name Entity Registrant Name Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Accrued interest expense and penalties payable related to unrecognized tax benefits Share Based Compensation Arrangement, Number of Shares of Common Stock that can be Issued for Each Restricted Stock Unit Granted Share Based Compensation Arrangement Number Of Shares Of Common Stock That Can Be Issued For Each Restricted Stock Unit Granted Number of shares of common stock received for each RSU granted Deferred Tax Liabilities, Goodwill and Intangible Assets Accelerated amortization of deductible intangibles Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Accumulated benefit obligation Restricted Stock Awards [ Member] Restricted Stock Awards [ Member] Restricted stock awards RSAs Entity Voluntary Filers Entity Voluntary Filers Customer Concentration Risk [Member] Customer Concentration Risk Finite-Lived Intangible Asset, Expected Amortization, Year Two 2027 Treasury Stock, Shares, Acquired Shares repurchased under share repurchase program (in shares) Other Nonoperating Income (Expense) Other non-operating items, net Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Deferred State and Local Income Tax Expense (Benefit) State and other Subsequent Events [Abstract] Cybersecurity Risk Management Positions or Committees Responsible [Flag] Contractual Termination Contractual termination. Contractual termination Contract termination Finite-Lived Intangible Asset, Expected Amortization, Year Three 2028 Income Tax Expense (Benefit) Provision for income taxes Effective tax rate, Amount Total Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Target Allocation Target allocation Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2030 Share Based Compensation Arrangement By Share Based Payment Award Additional Service Period Share Based Compensation Arrangement By Share Based Payment Award Additional Service Period Additional service period Stock Repurchased During Period, Value Repurchase of Common Stock Costs and Expenses [Abstract] Operating expenses: Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Consolidation Items [Axis] Federal Income Tax Expense (Benefit), Continuing Operations Federal Accounts Receivable, Allowance for Credit Loss, Writeoff Write-offs of accounts receivable Commitments and Contingencies, Policy [Policy Text Block] Loss contingencies Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Granted (in shares) Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Amounts recognized in Consolidated Balance Sheets Assets Total assets Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received, Total State and local taxes Debt Instrument, Number Of Covenants Debt Instrument, Number Of Covenants Number of covenants Loss Contingency, Settlement Agreement, Date Loss contigency, settlement agreement date, approved by court Income Statement [Abstract] Income Statement [Abstract] Reclassifications of Temporary to Permanent Equity Adjustment of redeemable noncontrolling interest to redemption value Retirement Plan Name [Domain] Multiemployer Plan Name [Domain] Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Accrued compensation costs Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Reductions of tax positions of prior years Share-Based Payment Arrangement [Policy Text Block] Employee awards stock-based employee compensation Defined Benefit Plan, Amortization of Gain (Loss) Amortization of actuarial loss Deferred Income Tax Expense (Benefit) Provision for deferred income taxes Total Contract with Customer, Sales Channel [Domain] Gain on sale of investments Equity Securities, FV-NI, Realized Gain (Loss) Equity Securities, FV-NI, Realized Gain (Loss), Total Performance Share Awards [Member] Performance Share Awards [Member] PSAs Performance Share Awards Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses Other Segment Expense Items Other segment expense items. Other segment items Recorded Unconditional Purchase Obligation Total Network Affiliation Agreements [Member] Network Affiliation Agreements [Member] Network affiliation agreements Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Vested (in shares) Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Allocation of Plan Assets Earnings Per Share, Diluted Earnings per share - diluted (in dollars per share) Earnings per share - diluted (in dollars per share) Operating Segments [Member] Operating Segments Finite-Lived Intangible Asset, Expected Amortization, Year Five 2030 Title of Individual [Domain] Title of Individual with Relationship to Entity [Domain] 401(k) match shares Four Zero One K Match Shares [Member] Four zero one K match shares. City Area Code City Area Code One Customer [Member] One Customer [Member] One Customer Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Auditor Name Auditor Name Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Pension Costs Licensing Agreements [Member] Television and radio station FCC broadcast licenses Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Amounts in accumulated other comprehensive loss Income Tax Examination, Penalties and Interest Expense Recognized expense/income from the release of penalty reserves Buildings and Improvements, Gross Buildings and improvements Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Indefinite-Lived Intangible Assets and Amortizable Intangible Assets Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity under credit facility Business Combination [Line Items] Business Acquisition [Line Items] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Other Intangible Assets [Member] Other Counterparty Name [Domain] Counterparty Name [Domain] Related Party Transaction, Agreement Term Extension Period Related Party Transaction, Agreement Term Extension Period Related party Transaction, agreement term extension period Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Litigation Case [Axis] Litigation Case [Axis] Operating Lease, Weighted Average Remaining Lease Term Weighted-average remaining lease term for lease portfolio (in years) Multiemployer Plan, Expenses Multiemployer Plan, Expenses Expenses incurred for multi-employer withdrawal liabilities Other, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Other, Percent Retirement Plan Name [Axis] Multiemployer Plan Name [Axis] Letter of Credit [Member] Letter of Credit Cash and Cash Equivalents, Policy [Policy Text Block] Cash and cash equivalents Property, Plant and Equipment, Net Net property and equipment Reimbursements from spectrum repacking Proceeds from Reimbursements of Property, Plant and Equipment Proceeds from reimbursements of property, plant and equipment. Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2028 Impairment of Intangible Assets, Finite-Lived Programming rights impairment Operating Income (Loss) Operating income Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Discount rate Retained Earnings [Member] Retained earnings Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Amortization of actuarial loss Share-Based Payment Arrangement, Noncash Expense Employee stock-based compensation awards Customer One Customer One [Member] Customer One Liabilities, Noncurrent Total noncurrent liabilities Fair Value Disclosure, Number of Investments Fair Value Disclosure, Number of Investments Number of investments held in collective trusts Operating Lease, Weighted Average Discount Rate, Percent Weighted average discount rate (as a percent) Operating Lease, Liability, Noncurrent Operating lease liabilities Operating lease liabilities (non-current) Fair Value, Inputs, Level 1 [Member] Level 1 Class of Stock [Line Items] Class of Stock [Line Items] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash flow used for financing activities Maximum 401(k) Plan Contribution Rates as a Percentage of Employees Earnings Maximum 401 K Plan Contribution Rates As Percentage Of Employees Earnings 401(k) employee maximum matching contribution (up to) Non-taxable or non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] Employer 401(k) Matching Contribution Employer 401 K Matching Contribution 401(k) employer matching contribution Unsecured Fixed Rate Notes 7.25 Percent Due September 2027 [Member] Unsecured Fixed Rate Notes 7.25 Percent Due September 2027 [Member] Unsecured notes bearing fixed rate interest at 7.25% due September 2027 Auditor Location Auditor Location Deferred Income Tax Liabilities, Net Net deferred income tax liabilities Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Amortization of actuarial loss Nonoperating Income (Expense) [Abstract] Non-operating (expense) income: Contract with Customer, Sales Channel [Axis] One Investment One Investment [Member] One Investment Income Tax Authority [Domain] Income Tax Authority [Domain] Debt Securities, Available-for-Sale [Table] Entity Interactive Data Current Entity Interactive Data Current Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Deferred Tax Liabilities, Gross [Abstract] Deferred tax liabilities Increase (Decrease) in Contract with Customer, Liability Increase (decrease) in deferred revenue Income Statement Location [Domain] Income Statement Location [Domain] Costs and Expenses, Related Party Cost of revenues Fair Value Measurement [Domain] Fair Value Measurement [Domain] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Recognition of foreign currency translation adjustments Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash flows from operating activities: Repayments of Lines of Credit Payments under revolving credit facilities, net Segment Reporting, Revenue Reconciling Item [Line Items] Defined Benefit Plan, Benefit Obligation, Payment for Settlement Pension settlements Common Stock, Dividends, Per Share, Declared Dividends declared, per share (in dollars per share) Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Effect of dilutive securities Line of Credit Facility, Current Borrowing Capacity Current borrowing capacity under credit facility Debt instrument, covenant, leverage ratio, maximum. Debt Instrument, Covenant, Leverage Ratio, Maximum Debt instrument covenant consolidated leverage ratio Recorded Unconditional Purchase Obligation [Line Items] Recorded Unconditional Purchase Obligation [Line Items] Share-Based Payment Arrangement, Expense, Tax Benefit Total income tax benefit Entity Tax Identification Number Entity Tax Identification Number Pension settlement charge Accumulated Defined Benefit Plans Adjustment Pension Settlement Charge Adjustment Attributable To Pension Plan [Member] Accumulated defined benefit plans adjustment pension settlement charge adjustment attributable to pension plan. Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders’ equity Long-Term Debt, Type [Axis] Long-term Debt, Type [Axis] Effective ​Income ​Tax​ Rate ​Reconciliation Non Taxable Merger Termination Fee Effective ​Income ​Tax​ Rate ​Reconciliation Non Taxable Merger Termination Fee Non-taxable Merger termination fee, Percent Debt Instrument, Term Debt instrument, term Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Proceeds from maturity of debt securities available for sale Other Comprehensive (Income) Loss, Defined Benefit Plan, Pension Payment Timing Related Charges, Before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Pension Payment Timing Related Charges, Before Tax Pension payment timing related charges Construction in Progress, Gross Construction in progress Local Phone Number Local Phone Number Related Party Transaction [Domain] Related Party Transaction [Domain] Comprehensive Income (Loss) [Line Items] Comprehensive Income Loss [Line Items] Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Expense for (income from) company-sponsored retirement plans Auditor Opinion [Text Block] Schedule of Net Funded Status [Table Text Block] Schedule of Net Funded Status Temporary Equity, Policy Temporary Equity, Policy [Policy Text Block] Redeemable Noncontrolling interest Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Long-term contract assets Accounting Policies [Abstract] Accounting Policies [Abstract] Payments for clean energy tax credits Payments for clean energy tax credits Payments for clean energy tax credits. Lynn Beall (Trelstad) [Member] Lynn Beall (Trelstad). Lynn Beall (Trelstad) Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other comprehensive income (loss), before reclassifications Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Deferred Tax Assets, Valuation Allowance [Roll Forward] Deferred Tax Assets, Valuation Allowance [Roll Forward] Deferred Tax Assets, Valuation Allowance [Roll Forward] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Total revenues AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Available-For-Sale Investment Lessee, Operating Lease, Liability, to be Paid, Year Four 2029 Employee compensation Labor and Related Expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Unrecognized compensation cost related to unvested share-based compensation for options, recognition period Impairment Charge on Reclassified Assets Impairment charge Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-Lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis]