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Leases - Schedule of Lease Expense and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Other assets:      
ROU assets $ 146.3 $ 156.3  
Right-of-use assets [Extensible List] Other Assets, Noncurrent Other Assets, Noncurrent  
Accrued liabilities:      
Current portion of lease liabilities $ 35.7 $ 32.6  
Current portion of lease liabilities [Extensible List] Accrued Liabilities, Current Accrued Liabilities, Current  
Other long-term liabilities:      
Non-current portion of lease liabilities $ 115.1 $ 128.7  
Non-current portion of lease liabilities [Extensible List] Other long-term liabilities Other long-term liabilities  
Total lease liabilities $ 150.8 $ 161.3  
Weighted average remaining lease-term (in years) 4 years 10 months 24 days    
Weighted average discount rate 4.55%    
Operating lease expense $ 61.8 $ 60.4 $ 56.6