v3.26.1
Debt - Interest Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Debt Instrument [Line Items]      
Debt issuance cost amortization $ 5.9 $ 7.8 $ 7.3
Debt discount amortization 27.2 64.8 37.5
Other interest expense 4.2 5.5 4.5
Total interest expense 221.3 259.2 198.3
Senior Indebtedness      
Debt Instrument [Line Items]      
Debt issuance cost amortization 2.5 3.6 4.5
Debt discount amortization 27.2 64.8 37.5
Interest expense 174.0 172.2 147.3
Total interest expense 203.7 240.6 189.3
Convertible debt      
Debt Instrument [Line Items]      
Debt issuance cost amortization 3.4 4.2 2.8
Interest expense 10.0 8.9 1.7
Total interest expense $ 13.4 $ 13.1 $ 4.5