v3.26.1
Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
After-Tax Amount        
Balance beginning of period $ 4,296.5 $ 3,809.4 $ 4,273.5 $ 3,742.8
Balance end of period 4,080.6 4,168.5 4,080.6 4,168.5
Deferred Gains and Losses on Derivatives        
Before-Tax Amount        
Accumulated derivative net gains as the beginning of the period 0.9 9.8 4.6 11.7
Net changes in fair value of derivatives: (3.0) 3.3 (8.3) 3.9
Net losses (gains) reclassified from accumulated other comprehensive loss into income: 3.1 (1.6) 4.7 (4.1)
Accumulated derivative net gains as of the end of the period 1.0 11.5 1.0 11.5
Income Tax Expense (Benefit)        
Accumulated derivative net gains as of the beginning of the period 0.6 2.2 1.4 2.8
Net changes in fair value of derivatives: (0.7) 0.6 (1.9) 0.8
Net losses (gains) reclassified from accumulated other comprehensive loss into income: 0.5 (0.4) 0.9 (1.2)
Accumulated derivative net gains as of the end of the period 0.4 2.4 0.4 2.4
After-Tax Amount        
Balance beginning of period 0.3 7.6 3.2 8.9
Net changes in fair value of derivatives: (2.3) 2.7 (6.4) 3.1
Net losses (gains) reclassified from accumulated other comprehensive loss into income: 2.6 (1.2) 3.8 (2.9)
Balance end of period 0.6 9.1 0.6 9.1
Deferred Gains and Losses on Derivatives | Foreign currency contracts        
Before-Tax Amount        
Net changes in fair value of derivatives: (3.0) 3.3 (8.3) 3.9
Net losses (gains) reclassified from accumulated other comprehensive loss into income: 3.3 (1.4) 5.1 (3.7)
Accumulated derivative net gains as of the end of the period (0.5)   (0.5)  
Income Tax Expense (Benefit)        
Net changes in fair value of derivatives: (0.7) 0.6 (1.9) 0.8
Net losses (gains) reclassified from accumulated other comprehensive loss into income: 0.6 (0.4) 1.0 (1.1)
After-Tax Amount        
Net changes in fair value of derivatives: (2.3) 2.7 (6.4) 3.1
Net losses (gains) reclassified from accumulated other comprehensive loss into income: 2.7 (1.0) 4.1 (2.6)
Deferred Gains and Losses on Derivatives | Treasury rate locks        
Before-Tax Amount        
Net losses (gains) reclassified from accumulated other comprehensive loss into income: (0.2) (0.2) (0.4) (0.4)
Income Tax Expense (Benefit)        
Net losses (gains) reclassified from accumulated other comprehensive loss into income: (0.1) 0.0 (0.1) (0.1)
After-Tax Amount        
Net losses (gains) reclassified from accumulated other comprehensive loss into income: $ (0.1) $ (0.2) $ (0.3) $ (0.3)