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Investments (Gain (Loss) on Investments) (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 | Sep. 30, 2018 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Impairments of investments | [1] |  | $ (2.6) | $ (29.2) | $ (36.8) | $ (29.2) |  |
Unrealized losses on equity securities held at reporting date |  |  | (3.6) | 0.0 | (6.4) | 0.0 |  |
Gain on sale of EPIX | [2] |  | 0.0 | 0.0 | 0.0 | 201.0 |  |
Gain (loss) on investments |  |  | (6.2) | $ (29.2) | (43.2) | 171.8 |  |
Equity securities without readily determinable fair value, impairments |  |  |  |  | 34.2 |  |  |
Equity securities without readily determinable fair value, amount |  |  | $ 0.5 |  | $ 0.5 |  | $ 0.0 | $ 30.6
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 |  |
[1] | In the three and nine months ended December 31, 2018 and 2017, amounts represent impairments of equity method investments, and the nine months ended December 31, 2018 also includes other-than-temporary impairments of $34.2 million on investments in equity securities without readily determinable fair values and notes receivable (previously included in other assets) which were written down to their estimated fair value of zero.
[2] | 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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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. Additionally, this item includes any gain (loss) on the sale or disposal of an equity method investment. + References No definition available. + Details
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