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Debt - Interest Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]        
Debt issuance cost amortization     $ 4.0 $ 4.7
Debt discount amortization     4.8 3.6
Other interest expense $ 1.1 $ 1.2 2.4 2.6
Total interest expense 46.8 53.3 94.0 103.6
Senior Indebtedness        
Debt Instrument [Line Items]        
Debt issuance cost amortization 1.1 1.7 2.6 3.4
Debt discount amortization 3.1 1.8 4.8 3.6
Interest expense 40.4 47.2 81.9 91.0
Total interest expense 44.6 50.7 89.3 98.0
Convertible Debt        
Debt Instrument [Line Items]        
Debt issuance cost amortization 0.7 0.7 1.4 1.3
Interest expense 0.4 0.7 0.9 1.7
Total interest expense $ 1.1 $ 1.4 $ 2.3 $ 3.0