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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |  |
Beginning balance | $ 9.6 | $ 9.7 | $ 13.8 |
Gross increases - tax positions in prior period |  | 0.1 | 0.3 |
Gross decreases - tax positions in prior period |  | (0.6) | (1.0) |
Gross increases - tax positions in current period |  | 0.9 | 1.1 |
Settlements |  | 0.0 | (2.1) |
Lapse of statute of limitations |  | (0.5) | (2.4) | $ (2.2)
Ending balance |  | 9.6 | 9.7 | $ 13.8
Unrecognized tax benefits that would impact effective tax rate |  | 1.5 |  |
Lapse of statute of limitations and settlements |  |  | 4.5 |
Unrecognized tax benefits accrued interest and penalties |  | $ 0.6 | $ 0.5 |
Forecast [Member] |  |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |  |
Lapse of statute of limitations and settlements | $ 2.4 |  |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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