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Mergers and Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 08, 2016
Business Acquisition [Line Items]      
Accrued merger consideration payable $ 826.2 $ 812.9  
Interest Rate, Percentage Spread on Federal Reserve Discount Rate 5.00%    
Goodwill $ 2,704.5 $ 2,700.5  
Starz      
Business Acquisition [Line Items]      
Goodwill     $ 2,169.7
Starz Dissenting Shareholders | Starz      
Business Acquisition [Line Items]      
Outstanding equity interests (in shares)     25,000,000
Period for demanding appraisal rights 60 days    
Shareholders withdrawing demands of appraisal rights (in shares) 2,510,485    
Accrued merger consideration payable $ 826.2   $ 797.3