Acquisitions and Dispositions - Other 2020 Nexstar Acquisitions - Additional Information (Details) - USD ($) $ in Millions				10 Months Ended	12 Months Ended
	Sep. 17, 2020	Mar. 02, 2020	Jan. 27, 2020	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Operating income					$ 1,312.1	$ 1,175.4	$ 1,375.4
WDKY-TV [Member]
Business Acquisition [Line Items]
Acquisition date	Sep. 17, 2020
Cash payment	$ 18.0
Television Station WJZY and WMYT [Member]
Business Acquisition [Line Items]
Acquisition date		Mar. 02, 2020
Cash payment		$ 45.3
KGBT-TV [Member]
Business Acquisition [Line Items]
Acquisition date			Jan. 27, 2020
Cash payment			$ 17.9
Other 2020 Nexstar Acquisitions [Member]
Business Acquisition [Line Items]
Revenue included in consolidated statements of operations and comprehensive income				$ 78.0
Operating income				$ 34.0