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Debt - Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Debt issuance cost amortization	$ 11.5	$ 17.1	$ 17.1
Debt discount amortization	44.9	71.1	121.7
Other interest expense	5.4	3.7	3.7
Total interest expense	257.0	356.9	497.3
Senior Secured Indebtedness
Debt Instrument [Line Items]
Debt issuance cost amortization	9.1	14.7	13.2
Debt discount amortization	7.0	6.6	2.9
Interest expense	187.1	227.4	277.6
Total interest expense	203.2	248.7	293.7
Convertible Debt
Debt Instrument [Line Items]
Debt issuance cost amortization	2.4	2.4	3.9
Debt discount amortization	37.9	64.5	118.8
Interest expense	8.1	37.6	77.2
Total interest expense	$ 48.4	$ 104.5	$ 199.9

X

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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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