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Investments Equity Interests Income (Loss) (Details) - USD ($) $ in Millions | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 11, 2017 | Mar. 15, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interests income (loss) |  |  | $ (42.9) |  | $ (52.8) |  | $ 10.7 |
EPIX |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interests income (loss) | $ 4.0 |  | 0.0 | [1] | 4.0 | [1] | 31.0 | [1]
Pop |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interests income (loss) |  | $ (8.4) | (8.4) | [2] | (9.0) | [2] | (6.9) | [2]
Other Equity Method Investments |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interests income (loss) |  |  | $ (34.5) |  | $ (47.8) |  | $ (13.4) |
[1] | The Company's equity interest in EPIX was sold in May 2017 (see further discussion under "Gain (Loss) on Investments" section below).
[2] | The Company's equity interest in Pop was sold in March 2019 (see further discussion under "Pop" section below).

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