Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Debt issuance cost amortization			$ 4.7	$ 6.4
Debt discount amortization			3.6	24.2
Other interest expense	$ 1.2	$ 1.2	2.6	1.9
Total interest expense	53.3	64.8	103.6	137.1
Senior Secured Indebtedness
Debt Instrument [Line Items]
Debt issuance cost amortization	1.7	2.3	3.4	5.2
Debt discount amortization	1.8	1.7	3.6	3.6
Interest expense	47.2	46.9	91.0	99.6
Total interest expense	50.7	50.9	98.0	108.4
Convertible Debt
Debt Instrument [Line Items]
Debt issuance cost amortization	0.7	0.6	1.3	1.2
Debt discount amortization	0.0	9.9	0.0	20.6
Interest expense	0.7	2.2	1.7	5.0
Total interest expense	$ 1.4	$ 12.7	$ 3.0	$ 26.8