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Goodwill and other intangible assets - Narrative (Details) - Retransmission agreements $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items] |
Decrease in accumulated amortization | $ 111.2
Decrease in gross intangible assets | $ 111.2

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- Definition Finite-Lived Intangible Assets, Decrease In Accumulated Amortization + References No definition available. + Details
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Namespace Prefix: | tgna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |