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Program Rights and Obligations (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Film Cost Disclosures [Abstract]      
Program rights, completed programming $ 334.5    
Program rights, in production programming $ 214.2    
Owned original program rights expected to be amortized within three years (as a percentage) 87.00%    
Program rights expected to be paid within twelve months $ 173.2    
Program rights write offs $ 40.9 $ 50.5 $ 49.4