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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Derivative [Line Items]              
Remaining maturity of forward foreign exchange contracts, maximum   16 months          
Unrealized gains in AOCI at time of termination $ 256.1 $ 256.1 $ 323.7 $ 224.6 $ 310.5 $ 218.8 $ (786.0)
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months 1.3 1.3          
Interest rate swap cash flow hedge gain estimated to be reclassified into earnings during next 12 months 26.7 26.7          
Net Cash Provided by (Used in) Operating Activities   (359.7) 401.4        
Net Cash Provided by (Used in) Financing Activities   (292.4) $ 17.4        
Interest rate swaps | Designated as Hedging Instrument              
Derivative [Line Items]              
US Dollar Amount or Notional Amount 345.0 $ 345.0     1,700.0    
Unrealized Gain (Loss) on Derivatives $ 9.4            
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018 | Designated as Hedging Instrument              
Derivative [Line Items]              
US Dollar Amount or Notional Amount         $ 300.0