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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance for Deferred Tax Assets [Member] - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Valuation and Qualifying Accounts [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ 46.9 | $ 43.4 | $ 48.9
Additions charged (benefit) to costs and expenses |  | 86.2 | 4.5 | (1.6)
Additions charged to other accounts | [1] | 2.8 | (1.0) | (3.9)
Reclassified as held for sale |  | (45.2) | 0.0 | 0.0
Balance at end of period |  | $ 90.7 | $ 46.9 | $ 43.4
[1] | Foreign currency translation and other adjustments.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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