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Debt (Accounting for Credit Agreement amendment and Senior Notes redemption and issuance) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt	$ (19.9)	$ (57.4)	$ 28.2
Revolving Credit Facility, Term Loan A and Senior Notes
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt			26.4
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances			62.1
Total			88.5
Revolving Credit Facility, Term Loan A and Senior Notes | New Debt Issuance Costs and Call Premiums
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt			21.2
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances			31.0
Total			52.2
Revolving Credit Facility, Term Loan A and Senior Notes | Previously Incurred Debt Issuance Costs
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt			5.2
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances			31.1
Total			36.3
Revolving Credit Facility
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt	$ 0.0	$ 0.0	$ 1.1

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