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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 11, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gain on sale of EPIX | [1] |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 201.0 |
Investment in equity method investee |  |  |  |  | 39.6 | $ 47.6 |
Pop |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment in equity method investee |  |  | $ 4.0 |  | $ 9.0 |  |
Equity method investment, ownership percentage |  |  | 50.00% | 50.00% | 50.00% | 50.00% |
Equity method investments |  |  | $ 95.7 |  | $ 95.7 |  | $ 91.3
Redeemable Preferred Stock | Pop |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Rate of dividend on preferred stock |  |  |  |  | 10.00% |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership interest sold |  | 31.15% |  |  |  |  |
Gain on sale of EPIX |  |  |  |  |  | $ 201.0 |
Minimum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 11.00% |  | 11.00% |  |
Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% |  | 50.00% |  |
[1] | In May 2017, the Company sold all of its 31.15% equity interest in EPIX, and recorded a gain before income taxes of approximately $201.0 million. Prior to the sale of its interest in EPIX, the Company had accounted for such interest as an equity method investment.

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