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Income Taxes, Unrecognized Tax Benefits, and Deferred Tax Asset Valuation Allowances (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Tax Credit Carryforward [Line Items] |  |  |
Tax benefit from recognition of tax credits | $ (14.5) |  |
Tax (benefit) from foreign development tax credit | (5.1) | $ 39.5 | $ 5.9
Net of valuation allowance, classification [Abstract] |  |  |
Income tax expense (benefit) related to US Tax Reform | (7.7) |  |
Deferred tax asset, income tax expense (benefit) | 2.5 |  |
Provisional income tax expense (benefit) related to US Tax Reform |  | 38.0 |
Valuation allowance - deferred tax assets | 43.4 | 48.9 |
Lapse of statute of limitations | (2.2) | (1.8) |
Foreign Tax Jurisdictions [Member] |  |  |
Net of valuation allowance, classification [Abstract] |  |  |
Valuation allowance - deferred tax assets |  |  | 2.0
Changes in deferred tax asset valuation allowances | (1.0) | (2.8) |
Other Tax Jurisdictions [Member] |  |  |
Net of valuation allowance, classification [Abstract] |  |  |
Valuation allowance - deferred tax assets | $ 4.3 |  |
Changes in deferred tax asset valuation allowances |  |  | $ (1.8)
Hungarian Development Tax Credit [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax (benefit) from foreign development tax credit |  | $ (9.0) |

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- Definition Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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