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Income Taxes - Deductions Related to Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 332.1 | $ 204.5 | $ 210.1
Additions Charged to Costs and Expenses | 26.0 | 16.2 | 36.2
Additions Charged to Other Accounts | 0.0 | 175.8 | 0.0
Deductions | (54.6) | (64.4) | (41.8)
Balance at End of Year | $ 303.5 | $ 332.1 | $ 204.5

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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=26873400&loc=d3e24092-122690 + Details
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