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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
EPIX    
Schedule of Equity Method Investments [Line Items]    
Current assets $ 408.3 $ 355.7
Non-current assets 399.4 360.4
Current liabilities 116.1 90.8
Non-current liabilities 18.5 23.9
Pop    
Schedule of Equity Method Investments [Line Items]    
Current assets 45.6 38.3
Non-current assets 184.0 192.5
Current liabilities 28.5 29.1
Non-current liabilities 555.7 8.2
Redeemable preferred stock $ 547.3 $ 466.5