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Derivative Instruments and Hedging Activities - Derivatives by Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Mar. 31, 2023
Derivatives, Fair Value [Line Items]      
Derivative Asset $ 28.1 $ 35.6  
Derivative Liability $ 1.6 $ 2.8  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other current assets Other current assets  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other accrued liabilities Other accrued liabilities  
Designated as Hedging Instrument | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative Asset $ 28.1 $ 35.6  
Derivative Liability 0.0 0.0  
Designated as Hedging Instrument | Forward exchange contracts      
Derivatives, Fair Value [Line Items]      
Derivative Asset 0.0 0.0  
Derivative Liability $ 1.6 2.8  
Other Current Assets | Cash Flow Hedging | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Derivative Asset   35.6 $ 2.9
Other Current Assets | Cash Flow Hedging | Designated as Hedging Instrument | Forward exchange contracts      
Derivatives, Fair Value [Line Items]      
Derivative Asset   0.0 2.9
Other Current Assets | Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative Asset   35.6 0.0
Other Non-current Assets | Cash Flow Hedging | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Derivative Asset   0.0 41.1
Other Non-current Assets | Cash Flow Hedging | Designated as Hedging Instrument | Forward exchange contracts      
Derivatives, Fair Value [Line Items]      
Derivative Asset   0.0 0.0
Other Non-current Assets | Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative Asset   0.0 41.1
Other Accrued Liabilities | Cash Flow Hedging | Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Derivative Liability   2.8 0.1
Other Accrued Liabilities | Cash Flow Hedging | Designated as Hedging Instrument | Forward exchange contracts      
Derivatives, Fair Value [Line Items]      
Derivative Liability   2.8 0.1
Other Accrued Liabilities | Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative Liability   $ 0.0 $ 0.0