Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt issuance cost amortization			$ 7.1	$ 9.2
Debt discount amortization			5.4	34.9
Other interest expense	$ 1.2	$ 1.8	3.8	3.7
Total interest expense	52.8	62.1	156.4	199.2
Senior Secured Indebtedness
Debt Instrument [Line Items]
Debt issuance cost amortization	1.7	2.2	5.1	7.4
Debt discount amortization	1.8	1.7	5.4	5.3
Interest expense	46.8	45.3	137.8	144.9
Total interest expense	50.3	49.2	148.3	157.6
Convertible Debt
Debt Instrument [Line Items]
Debt issuance cost amortization	0.7	0.6	2.0	1.8
Debt discount amortization	0.0	9.0	0.0	29.6
Interest expense	0.6	1.5	2.3	6.5
Total interest expense	$ 1.3	$ 11.1	$ 4.3	$ 37.9