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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill [Roll Forward]    
Balance, beginning of period $ 534.8 $ 323.4
Merger or Acquisition 2,199.4 210.8
Measurement period adjustments (33.7) 0.6
Balance, end of period 2,700.5 534.8
Motion Pictures    
Goodwill [Roll Forward]    
Balance, beginning of period 294.4 294.4
Merger or Acquisition 68.4 0.0
Measurement period adjustments (0.9) 0.0
Balance, end of period 361.9 294.4
Television Production    
Goodwill [Roll Forward]    
Balance, beginning of period 240.4 29.0
Merger or Acquisition 0.0 210.8
Measurement period adjustments 0.0 0.6
Balance, end of period 240.4 240.4
Media Networks    
Goodwill [Roll Forward]    
Balance, beginning of period 0.0 0.0
Merger or Acquisition 2,131.0 0.0
Measurement period adjustments (32.8) 0.0
Balance, end of period 2,098.2 $ 0.0
Starz    
Goodwill [Roll Forward]    
Measurement period adjustments (33.7)  
Adjustment to accounts receivable (2.1)  
Adjustment to investments in film and television programs and programming rights 9.2  
Adjustment to intangible assets 50.0  
Adjustment to accounts payable and accrued liabilities (16.5)  
Adjustment to corporate debt 3.4  
Adjustment to deferred tax liabilities (17.2)  
Adjustment to other liabilities 7.0  
Adjustment to fair value of net assets acquired $ 33.7