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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Reconciliation of unrecognized tax benefits [Roll Forward] |  |  |  |
Beginning balance | $ 13.6 | $ 14.2 |  | $ 5.9
Gross increases - tax positions in prior period |  | 0.8 |  | 0.3
Gross decreases - tax positions in prior period |  | (1.2) | [1] | (0.2)
Gross increases - due to acquisition |  | 1.4 |  | 7.3
Gross increases - tax positions in current period |  | 0.5 |  | 0.9
Settlements |  | (0.3) |  | 0.0
Lapse of statute of limitations |  | (1.8) |  | 0.0
Ending balance |  | 13.6 |  | 14.2
Unrecognized tax benefits that would impact effective tax rate | 1.6 | 12.1 |  |
Unrecognized tax benefits accrued interest and penalties |  | 1.0 |  | $ 0.8
Change in income tax expense (benefit) due to the reduction of federal corporate tax |  | $ 1.0 |  |
Forecast [Member] |  |  |  |
Reconciliation of unrecognized tax benefits [Roll Forward] |  |  |  |
Lapse of statute of limitations | $ (2.2) |  |  |
[1] | Includes $1.0 million related to the reduction of the U.S. federal corporate tax rate as a result of the Tax Act.

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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 unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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