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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) $ in Millions				3 Months Ended		9 Months Ended
	Nov. 12, 2019 lawsuit	Aug. 09, 2018 USD ($)	Dec. 21, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Aug. 23, 2019 regional_sport_network	Oct. 03, 2018 lawsuit
COMMITMENTS AND CONTINGENCIES
Interest expense				$ 129.0	$ 76.0	$ 237.0	$ 238.0
Various Cases Alleging Violation Of Sherman Antitrust Act
COMMITMENTS AND CONTINGENCIES
Loss contingency, number of other broadcasters \| lawsuit									13
Breach Of Merger Agreement
COMMITMENTS AND CONTINGENCIES
Proposed fine		$ 1,000.0
Estimated liability recorded				120.0		135.0
Unfavorable Regulatory Action
COMMITMENTS AND CONTINGENCIES
Proposed fine			$ 13.0
Subsequent Event \| Various Cases Alleging Violation Of Sherman Antitrust Act
COMMITMENTS AND CONTINGENCIES
Loss contingency, new claims filed, number (lawsuit) \| lawsuit	22
Deferred Purchase Price \| RSNs
COMMITMENTS AND CONTINGENCIES
Contingent consideration liability, current				8.0		8.0
Contingent consideration liability, noncurrent				92.0		92.0
Interest expense				0.5		0.5
Profit Participation Interest \| RSNs
COMMITMENTS AND CONTINGENCIES
Contingent consideration liability, current				8.0		8.0
Contingent consideration liability, noncurrent				44.0		44.0
Interest expense				0.3		0.3
Percent obligated to pay of excess cash flow								7.00%
Number of regional sports networks \| regional_sport_network								2
Equity Redemption Liability \| RSNs
COMMITMENTS AND CONTINGENCIES
Contingent consideration liability, current				37.0		37.0
Contingent consideration liability, noncurrent				245.0		245.0
Interest expense				$ 3.0		$ 3.0