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Debt (Gain (Loss) on Extinguishment of Debt) (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)
Term Loan A
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	0.0	(1.3)	0.0
Senior Notes
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	21.2	58.7	(24.7)
Revolving Credit Facility and Term Loan A
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	0.0	0.0	(1.7)
Revolving Credit Facility
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	0.0	0.0	(1.1)
Term Loan B and Other
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	0.0	0.0	(0.7)
Production Loans
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (1.3)	$ 0.0	$ 0.0

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