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Debt - Interest Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Debt Instrument [Line Items]      
Debt issuance cost amortization $ 7.8 $ 7.3 $ 9.5
Debt discount amortization 64.8 37.5 7.2
Other interest expense 5.5 4.5 5.0
Total interest expense 259.2 198.3 203.9
Senior Indebtedness      
Debt Instrument [Line Items]      
Debt issuance cost amortization 3.6 4.5 6.8
Debt discount amortization 64.8 37.5 7.2
Interest expense 172.2 147.3 179.3
Total interest expense 240.6 189.3 193.3
Convertible debt      
Debt Instrument [Line Items]      
Debt issuance cost amortization 4.2 2.8 2.7
Interest expense 8.9 1.7 2.9
Total interest expense $ 13.1 $ 4.5 $ 5.6