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Revenue - Broadcasting Segment Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 439.9 $ 455.0 $ 844.8 $ 870.5
Net revenue 518.6 496.8 1,010.0 950.5
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 439.9 455.0 844.8 870.5
Operating Segments | Broadcasting        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 10.0 11.1 19.8 21.7
Other revenue 0.0 0.0 0.0 0.0
Net revenue 10.0 11.1 19.8 21.7
Operating Segments | Broadcasting | Network advertising        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 5.4 7.0 10.8 13.8
Operating Segments | Broadcasting | Broadcast station        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 2.9 2.8 5.6 5.5
Operating Segments | Broadcasting | Network distribution        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 1.2 0.9 2.7 1.8
Operating Segments | Broadcasting | Other        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 0.5 $ 0.4 $ 0.7 $ 0.6