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Debt - Interest Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Debt Instrument [Line Items]    
Debt issuance cost amortization $ 2.2 $ 2.3
Debt discount amortization 1.7 1.8
Other interest expense 1.3 1.4
Total interest expense 47.2 50.3
Senior Indebtedness    
Debt Instrument [Line Items]    
Debt issuance cost amortization 1.5 1.7
Debt discount amortization 1.7 1.8
Interest expense 41.5 43.8
Total interest expense 44.7 47.3
Convertible Debt    
Debt Instrument [Line Items]    
Debt issuance cost amortization 0.7 0.6
Interest expense 0.5 1.0
Total interest expense $ 1.2 $ 1.6