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, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) renewal	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items]
Total revenue			$ 773.0	$ 917.0	$ 2,333.0	$ 2,544.0
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 revenue			$ 33.0	41.0	$ 97.0	109.0
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					$ 72.0		69.0
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			0.3	0.2	$ 1.0	1.0
Sinclair Broadcast Group, LLC
Related Party Transaction [Line Items]
Total revenue			$ 667.0	845.0	$ 2,040.0	2,322.0
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 revenue			$ 33.0	41.0	$ 97.0	109.0
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					$ 72.0		$ 69.0
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			$ 0.3	$ 0.2	$ 1.0	$ 1.0