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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 9.7	$ 9.3	$ 9.6
Gross increases - tax positions in prior period		0.2	0.1
Gross decreases - tax positions in prior period		(0.1)	(0.2)
Gross increases - tax positions in current period		0.9	1.0
Lapse of statute of limitations		(0.6)	(1.2)
Ending balance		9.7	9.3
Unrecognized tax benefits that would impact effective tax rate		7.8
Unrecognized tax benefits accrued interest and penalties		$ 0.8	$ 0.7
Forecast [Member]
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Lapse of statute of limitations	$ (2.0)

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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.

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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 https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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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/disclosureRef
-Publisher FASB
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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