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Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss) $ (11.7) $ (12.7) $ (17.8) $ (21.0)
EPIX        
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss) 0.0 0.0 0.0 [1] 4.0 [1]
Pop        
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss) (0.3) 0.5 (1.1) (2.5)
Other        
Schedule of Equity Method Investments [Line Items]        
Equity interests income (loss) $ (11.4) $ (13.2) $ (16.7) $ (22.5)
[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 unaudited condensed consolidated statement of operations for the six months ended September 30, 2017. Prior to the sale of its interest in EPIX, the Company had accounted for such interest as an equity method investment.