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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Mar. 31, 2023
Derivative [Line Items]        
Remaining maturity of forward foreign exchange contracts, maximum 22 months      
Unrealized gains in AOCI at time of termination $ 49.0 $ (728.2) $ 310.5 $ (786.0)
Derivative Liability 1.6   2.8  
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months 4.1      
Interest rate swap cash flow hedge gain estimated to be reclassified into earnings during next 12 months 31.1      
Net Cash Provided by (Used in) Operating Activities (158.9) 29.2    
Net Cash Provided by (Used in) Financing Activities (75.9) $ (60.5)    
Interest rate swaps | Designated as Hedging Instrument        
Derivative [Line Items]        
US Dollar Amount or Notional Amount 1,700.0   1,700.0  
Derivative Liability 0.0   0.0  
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   $ 300.0