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Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
May 11, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss)   $ (52.8) $ 10.7 $ 44.2
EPIX        
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss) $ 4.0 4.0 31.0 52.1
Pop        
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss)   (9.0) (6.9) (1.8)
Other        
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss) [1]   $ (47.8) $ (13.4) $ (6.1)
[1] The Company records its share of the net income or loss of certain other equity method investments on a one quarter lag.