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Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 11, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interests income (loss) |  | $ (8.3) | $ 10.8
EPIX |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interests income (loss) | $ 4.0 | 4.0 | 11.0
Pop |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interests income (loss) |  | (3.0) | 0.3
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interests income (loss) |  | $ (9.3) | $ (0.5)

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