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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 15, 2019 | May 31, 2017 | Mar. 15, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proceeds from the sale of equity method investee, net of transaction costs |  |  |  | $ 48.0 | $ 393.7 | $ 0.0
Gain (loss) on sale of equity method investments |  |  |  | (44.6) | $ 201.0 | $ 0.0
Pop |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 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% |  |  |
Disposed by sale | EPIX |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest sold |  | 31.15% |  |  |  |
Gain (loss) on sale of equity method investments |  |  |  |  | $ 201.0 |
Disposed by sale | Pop |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest sold | 50.00% |  |  |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | $ 48.0 |  |  |  |  |
Gain (loss) on sale of equity method investments |  |  |  | $ (44.6) |  |
Minimum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 11.00% |  |
Maximum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 49.00% |  |

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