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Debt - Interest Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Debt Instrument [Line Items]    
Debt issuance cost amortization $ 1.4 $ 2.0
Debt discount amortization 1.4 16.6
Other interest expense 1.1 0.8
Total interest expense 57.4 61.8
Senior Indebtedness    
Debt Instrument [Line Items]    
Debt issuance cost amortization 0.7 0.9
Debt discount amortization 1.4 16.6
Interest expense 51.0 41.3
Total interest expense 53.1 58.8
Convertible debt    
Debt Instrument [Line Items]    
Debt issuance cost amortization 0.7 1.1
Interest expense 2.5 1.1
Total interest expense $ 3.2 $ 2.2