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Debt - Interest Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]        
Debt issuance cost amortization     $ 2.7 $ 4.3
Debt discount amortization     6.7 28.1
Other interest expense $ 0.5 $ 2.2 1.6 3.0
Total interest expense 56.3 59.1 113.7 120.9
Senior Indebtedness        
Debt Instrument [Line Items]        
Debt issuance cost amortization 0.6 0.9 1.3 1.8
Debt discount amortization 5.3 11.5 6.7 28.1
Interest expense 46.7 40.4 97.7 81.7
Total interest expense 52.6 52.8 105.7 111.6
Convertible debt        
Debt Instrument [Line Items]        
Debt issuance cost amortization 0.7 1.4 1.4 2.5
Interest expense 2.5 2.7 5.0 3.8
Total interest expense $ 3.2 $ 4.1 $ 6.4 $ 6.3