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Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
May 11, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss)   $ (13.8) $ (1.5) $ (34.8) $ 11.2
EPIX          
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss) $ 4.0 0.0 5.3 4.0 21.3
Pop          
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss)   (1.4) (2.6) (3.9) (4.6)
Other          
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss)   $ (12.4) $ (4.2) $ (34.9) $ (5.5)