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Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]    
Equity interests income (loss) $ (6.2) $ (8.3)
EPIX    
Schedule of Equity Method Investments [Line Items]    
Equity interests income (loss) [1] 0.0 4.0
Pop    
Schedule of Equity Method Investments [Line Items]    
Equity interests income (loss) (0.8) (3.0)
Other    
Schedule of Equity Method Investments [Line Items]    
Equity interests income (loss) $ (5.4) $ (9.3)
[1] In May 2017, the Company sold all of its 31.15% equity interest in EPIX. The Company recorded a gain before income taxes of approximately $201.0 million which is reflected in the gain (loss) on investments line item in the consolidated statement of operations for the three months ended June 30, 2017. Prior to the sale of its interest in EPIX, the Company had accounted for such interest as an equity method investment.