Other matters (Details) $ in Millions		1 Months Ended				3 Months Ended
	Jul. 30, 2018 defendant	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) agreement	Jun. 30, 2019 defendant	Dec. 13, 2018 defendant	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
MadHive
Business Acquisition [Line Items]
Number of renewed existing commercial agreements | agreement			2
Intangible Contract Asset
Business Acquisition [Line Items]
Amortizable intangible assets, gross		$ 20.8
Intangible asset useful life		2 years
Equity And Debt Investment | Affiliated Entity
Business Acquisition [Line Items]
Expenses incurred with related party						$ 26.0	$ 23.9
Accounts payable and accrued liabilities with related party			$ 8.9			$ 17.2
Clay, Massey & Associates, P.C. v. Gray Television
Business Acquisition [Line Items]
Number of other broadcasters settling DOJ complaint (defendant) | defendant	16			4
Settled litigation
Business Acquisition [Line Items]
Number of other broadcasters settling DOJ complaint (defendant) | defendant				4	7