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Debt - Debt Transactions and Gain (Loss) on Extinguishment of Debt (Details) - USD ($)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
May 31, 2024
Debt Instrument [Line Items]        
Debt instrument, repurchase amount $ 452,000,000.0 $ 61,400,000 $ 135,000,000.0  
Gain (loss) on extinguishment of debt $ (5,600,000) 21,200,000 58,700,000  
Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage       5.50%
Exchange Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, repurchased face amount   85,000,000.0 200,000,000.0  
Debt instrument, interest rate, stated percentage       5.50%
Debt instrument, repurchase amount   $ 61,400,000 $ 135,000,000.0