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RELATED PERSON TRANSACTIONS - Cunningham Broadcasting Corporation (Details) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) renewal	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Total revenues			$ 917.0	$ 767.0	$ 2,544.0	$ 2,308.0
Cunningham
Related Party Transaction [Line Items]
Right to acquire capital stock			100.00%		100.00%
Remaining purchase price			$ 54.0		$ 54.0		$ 54.0
Purchase options, broadcast stations			0.2		0.2
Cunningham \| Related Party
Related Party Transaction [Line Items]
Total revenues			$ 41.0	33.0	$ 109.0	102.0
Share service agreement, annual service consideration increasing rate ( as a percent)	3.00%
Cunningham \| LMA
Related Party Transaction [Line Items]
Number of additional renewal terms \| renewal					1
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			$ 6.0		$ 6.0
Annual increase in aggregate purchase price			6.00%		6.00%
Amounts of transaction					$ 68.0		65.0
Amount paid			$ 3.0	3.0	$ 9.0	9.0
Cunningham \| Renewal Term
Related Party Transaction [Line Items]
Agreement renewal period					8 years
Cunningham \| Initial Fee
Related Party Transaction [Line Items]
Amounts of transaction		$ 1.0
Cunningham \| Annual Master Control And Maintenance Fee
Related Party Transaction [Line Items]
Amounts of transaction		0.3
Cunningham \| Annual Fee
Related Party Transaction [Line Items]
Amounts of transaction	$ 0.6
Cunningham \| Multi-Cast Agreements
Related Party Transaction [Line Items]
Amount paid			0.2	0.5	$ 1.2	1.5
Sinclair Broadcast Group, LLC
Related Party Transaction [Line Items]
Total revenues			$ 845.0	697.0	$ 2,322.0	2,213.0
Sinclair Broadcast Group, LLC \| Cunningham
Related Party Transaction [Line Items]
Right to acquire capital stock			100.00%		100.00%
Remaining purchase price			$ 54.0		$ 54.0		54.0
Purchase options, broadcast stations			0.2		0.2
Sinclair Broadcast Group, LLC \| Cunningham \| Related Party
Related Party Transaction [Line Items]
Total revenues			$ 41.0	33.0	$ 109.0	102.0
Share service agreement, annual service consideration increasing rate ( as a percent)	3.00%
Sinclair Broadcast Group, LLC \| Cunningham \| LMA
Related Party Transaction [Line Items]
Number of additional renewal terms \| renewal					1
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			$ 6.0		$ 6.0
Annual increase in aggregate purchase price			6.00%		6.00%
Amounts of transaction					$ 68.0		$ 65.0
Amount paid			$ 3.0	3.0	$ 9.0	9.0
Sinclair Broadcast Group, LLC \| Cunningham \| Renewal Term
Related Party Transaction [Line Items]
Agreement renewal period					8 years
Sinclair Broadcast Group, LLC \| Cunningham \| Initial Fee
Related Party Transaction [Line Items]
Amounts of transaction		1.0
Sinclair Broadcast Group, LLC \| Cunningham \| Annual Master Control And Maintenance Fee
Related Party Transaction [Line Items]
Amounts of transaction		$ 0.3
Sinclair Broadcast Group, LLC \| Cunningham \| Annual Fee
Related Party Transaction [Line Items]
Amounts of transaction	$ 0.6
Sinclair Broadcast Group, LLC \| Cunningham \| Multi-Cast Agreements
Related Party Transaction [Line Items]
Amount paid			$ 0.2	$ 0.5	$ 1.2	$ 1.5