Business Segment Information - Summary of Information About Network Segment Significant Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 1,096.3	$ 1,100.1	$ 1,091.5
Less: Significant and other segment expenses
Depreciation and amortization expense	338.9	369.5	408.8
Restructuring and severance related charges	60.5	10.8	0.0
Total operating costs and expenses	1,201.0	1,181.2	1,177.6
Operating loss	(104.7)	(81.1)	(86.1)
Operating Segments [Member] | Network [Member]
Segment Reporting Information [Line Items]
Revenue	1,096.3	1,100.1	1,091.5
Less: Significant and other segment expenses
Employee and related costs	225.0	228.9	224.7
Programming expense	150.2	151.6	146.2
Network expense	33.7	47.6	53.1
Contract services	92.9	97.3	89.9
Other expenses	268.0	250.1	228.9
Depreciation and amortization expense	338.7	369.2	408.4
Restructuring and severance related charges	59.3	10.3	0.0
Total operating costs and expenses	1,167.8	1,155.0	1,151.2
Operating loss	$ (71.5)	$ (54.9)	$ (59.7)