Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 3.1	$ 64.6	$ 69.1
Increases in tax positions for current year	0.0	0.0	0.0
Increases in tax positions for prior years	0.0	0.0	0.2
Decreases in tax positions for prior years	0.0	0.0	0.0
Settlements	(3.1)	(60.7)	(4.3)
Lapse in statute of limitations	0.0	(0.8)	(0.4)
Unrecognized tax benefits, ending balance	$ 0.0	$ 3.1	$ 64.6

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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-Topic 740
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-Name Accounting Standards Codification
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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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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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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 increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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

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