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Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 11, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interests income (loss) |  | $ (12.7) | $ 1.9 | $ (21.0) | $ 12.7
EPIX |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interests income (loss) | $ 4.0 | 0.0 | 5.1 | 4.0 | 16.0
Pop |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interests income (loss) |  | 0.5 | (2.4) | (2.5) | (2.1)
Other |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interests income (loss) |  | $ (13.2) | $ (0.8) | $ (22.5) | $ (1.2)

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