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Investments (Gain (Loss) on Investments) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Impairments of investments |  | $ 0.0 | $ (36.8) | $ (29.2)
Unrealized losses on equity securities held at reporting date |  | (0.5) | (6.2) | 0.0
Gain (loss) on sale of equity method investees |  | 0.0 | (44.6) | 201.0
Gain (loss) on investments |  | $ (0.5) | (87.6) | 171.8
Equity Securities without readily determinable fair value, impairments |  |  | 34.2 | 10.0
Disposed by sale | Pop |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain (loss) on sale of equity method investees |  |  | $ 44.6 |
Disposed by sale | EPIX |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest sold | 31.15% |  |  |
Gain (loss) on sale of equity method investees |  |  |  | $ 201.0

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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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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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