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RELATED PERSON TRANSACTIONS - Cunningham Broadcasting Corporation (Details) $ in Millions	1 Months Ended		3 Months Ended								12 Months Ended
	Aug. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) renewal	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related person transactions
Debt and lease obligations			$ 12,340.0								$ 12,340.0
Deferred financing costs			4.0				$ 19.0				4.0	$ 19.0
Revenue			1,476.0	$ 1,535.0	$ 1,612.0	$ 1,511.0	1,512.0	$ 1,539.0	$ 1,283.0	$ 1,609.0	6,134.0	5,943.0	$ 4,240.0
Consolidated VIEs
Related person transactions
Debt and lease obligations			$ 9.0				16.0				9.0	16.0
LMA \| Cunningham
Related person transactions
Payments to related party											$ 11.0	8.0	8.0
Cunningham \| Cunningham License Related Assets
Related person transactions
Agreement renewal period											8 years
Revenue											$ 144.0	157.0	$ 155.0
Cunningham \| Affiliated Entity
Related person transactions
Percentage of the total capital stock held in the related party, none of which have voting rights			100.00%								100.00%
Liabilities treated as prepayment of purchase price			$ 58.0				54.0				$ 58.0	54.0
Remaining purchase price			54.0				54.0				54.0	54.0
Purchase options broadcast stations			0.2								0.2
Equipment purchase agreement, consideration amount		$ 1.0
Equipment purchase agreement, annual service consideration		$ 0.2
Share service agreement, annual service consideration	$ 0.5
Share service agreement, annual service consideration increasing rate ( as a percent)	3.00%
Cunningham \| Affiliated Entity \| Consolidated VIEs
Related person transactions
Debt and lease obligations			7.0								7.0
Deferred financing costs			$ 0.2								$ 0.2
Cunningham \| LMA \| Affiliated Entity
Related person transactions
Number of additional renewal terms \| renewal											2
Agreement renewal period											5 years
Percentage of net broadcast revenue used to determine annual LMA fees required to be paid			3.00%								3.00%
Amount used to determine annual LMA fees required to be paid			$ 5.0								$ 5.0
Annual increase in aggregate purchase price (as a percent)			6.00%								6.00%
Guarantee Obligations
Related person transactions
Unconditional and irrevocably guaranteed debt			$ 39.0				$ 49.0				$ 39.0	$ 49.0
Guarantee Obligations \| Cunningham \| Affiliated Entity
Related person transactions
Unconditional and irrevocably guaranteed debt			$ 37.0								$ 37.0