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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