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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 11, 2017 | May 11, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on sale of equity method investee |  |  | $ 201.0 | $ 0.0 | $ 0.0
Proceeds from the sale of equity method investee, net of transaction costs |  |  | 393.7 | 0.0 | 0.0
Distribution from equity method investee |  |  | $ 0.0 | $ 14.0 | $ 0.0
EPIX |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 31.15% | 31.15% |  | 31.15% | 31.15%
Pop |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% | 50.00% | 50.00%
Redeemable Preferred Stock | Pop |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Rate of dividend on preferred stock |  |  | 10.00% |  |
Total accretion period to redemption date of mandatorily redeemable preferred stock units and dividend |  |  | 10 years |  |
Disposed by sale | EPIX |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on sale of equity method investee |  |  | $ 201.0 |  |
Ownership interest sold | 100.00% |  |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | $ 397.2 |  |  |  |
Lions Gate | Disposed by sale | EPIX |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest sold | 31.15% |  |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | $ 373.8 |  |  |  |
Distribution from equity method investee |  | $ 23.4 |  |  |
Minimum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 9.00% |  |
Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% |  |

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