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Debt - Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Debt issuance cost amortization	$ 9.5	$ 11.5	$ 17.1
Debt discount amortization	7.2	44.9	71.1
Other interest expense	5.0	5.4	3.7
Total interest expense	203.9	257.0	356.9
Senior Indebtedness
Debt Instrument [Line Items]
Debt issuance cost amortization	6.8	9.1	14.7
Debt discount amortization	7.2	7.0	6.6
Interest expense	179.3	187.1	227.4
Total interest expense	193.3	203.2	248.7
Convertible Debt
Debt Instrument [Line Items]
Debt issuance cost amortization	2.7	2.4	2.4
Debt discount amortization	0.0	37.9	64.5
Interest expense	2.9	8.1	37.6
Total interest expense	$ 5.6	$ 48.4	$ 104.5

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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