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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 | Mar. 31, 2016
Tax Credit Carryforward [Line Items] |  |  |  |
Tax (benefit) from foreign development tax credit |  | $ 39.5 | $ 5.9 | $ (8.9)
Valuation Allowance [Line Items] |  |  |  |
Valuation allowance - deferred tax assets |  | 48.9 | 49.6 |
Foreign Tax Jurisdictions [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Valuation allowance - deferred tax assets |  |  | 2.0 |
Valuation allowance - deferred tax assets change in amount |  | (2.8) |  | (3.0)
Other Tax Jurisdictions [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Valuation allowance - deferred tax assets change in amount |  |  | $ (1.8) | $ 5.0
Forecast [Member] | Foreign Tax Jurisdictions [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Valuation allowance - deferred tax assets change in amount | $ (3.0) |  |  |
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 deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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