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Revenue - Broadcasting Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 171.8	$ 186.6
Total revenue	171.8	186.6
Spectrum
Segment Reporting Information [Line Items]
Revenue	10.5	10.1
Other revenue	0.0	0.0
Total revenue	10.5	10.1
Network advertising | Spectrum
Segment Reporting Information [Line Items]
Revenue	4.7	5.0
Broadcast station | Spectrum
Segment Reporting Information [Line Items]
Revenue	4.4	3.5
Network distribution | Spectrum
Segment Reporting Information [Line Items]
Revenue	0.9	1.0
Other | Spectrum
Segment Reporting Information [Line Items]
Revenue	$ 0.5	$ 0.6

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