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Investments (Carrying Amount Of Equity Method Investments) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | May 11, 2017 | Mar. 31, 2017 | Sep. 30, 2016
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Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  | $ 137.0 |  | $ 322.9 |
EPIX |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 31.15% |  | 31.15%
Equity method investments | [1] | $ 0.0 |  | 188.8 |
Pop |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  |  |
Equity method investments |  | $ 94.2 |  | 96.8 |
Other |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  | $ 42.8 |  | $ 37.3 |
[1] | In May 2017, the Company sold all of its 31.15% equity interest in EPIX to MGM (see further details below).

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