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Mergers and Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 11, 2017
Dec. 08, 2016
Dec. 31, 2017
Dec. 31, 2017
Dec. 11, 2017
Mar. 31, 2017
Business Acquisition [Line Items]            
Accrued merger consideration payable     $ 854.5 $ 854.5   $ 812.9
Interest Rate, Percentage Spread on Federal Reserve Discount Rate     5.00% 5.00%    
Goodwill     $ 2,740.8 $ 2,740.8   $ 2,700.5
Starz            
Business Acquisition [Line Items]            
Goodwill   $ 2,177.0        
Purchase price, cash consideration   $ 1,176.1        
Good Universe            
Business Acquisition [Line Items]            
Goodwill         $ 29.0  
Period for issuance of equity interests after closing date 1 year          
Purchase price, cash consideration $ 20.4          
Purchase price, cash consideration to be paid after one-year of the closing date 1.4          
Purchase price, loans assumed $ 23.6          
Repayments of corporate debt and production loans     $ 14.9      
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 2,510,485    
Accrued merger consideration payable   $ 797.3 $ 854.5 $ 854.5    
Class B Non-Voting Shares | Good Universe            
Business Acquisition [Line Items]            
Purchase price, common shares to be issued, number of shares 119,751