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

X

- 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

X

- 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

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: