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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