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Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Tax Expense (Benefit)    
Balance beginning of period $ 3,742.8 $ 4,656.8
Balance end of period 3,809.4 4,755.2
Deferred Gains and Losses on Derivatives    
Before-Tax Amount    
Accumulated derivative net gains as the beginning of the period 11.7 (1.3)
Net changes in fair value of derivatives 0.6 6.8
Net gains (loss) reclassified from accumulated other comprehensive loss into income (2.5) 2.6
Accumulated derivative net gains as of the end of the period 9.8 8.1
Income Tax Expense (Benefit)    
Accumulated derivative net gains as of the beginning of the period 2.8 (0.5)
Net changes in fair value of derivatives 0.2 2.2
Net gains (loss) reclassified from accumulated other comprehensive loss into income (0.8) 0.3
Accumulated derivative net gains as of the end of the period 2.2 2.0
Income Tax Expense (Benefit)    
Balance beginning of period 8.9 (0.8)
Net changes in fair value of derivatives 0.4 4.6
Net gains (loss) reclassified from accumulated other comprehensive loss into income (1.7) 2.3
Balance end of period 7.6 6.1
Deferred Gains and Losses on Derivatives | Foreign currency contracts    
Before-Tax Amount    
Net changes in fair value of derivatives 0.6 (1.1)
Net gains (loss) reclassified from accumulated other comprehensive loss into income (2.3) 2.6
Accumulated derivative net gains as of the end of the period (0.2)  
Income Tax Expense (Benefit)    
Net changes in fair value of derivatives 0.2 0.1
Net gains (loss) reclassified from accumulated other comprehensive loss into income (0.7) 0.3
Income Tax Expense (Benefit)    
Net changes in fair value of derivatives 0.4 (1.2)
Net gains (loss) reclassified from accumulated other comprehensive loss into income (1.6) 2.3
Deferred Gains and Losses on Derivatives | Commodity contracts    
Before-Tax Amount    
Net changes in fair value of derivatives   (0.3)
Income Tax Expense (Benefit)    
Net changes in fair value of derivatives   0.0
Income Tax Expense (Benefit)    
Net changes in fair value of derivatives   (0.3)
Deferred Gains and Losses on Derivatives | Treasury rate locks    
Before-Tax Amount    
Net changes in fair value of derivatives   8.2
Net gains (loss) reclassified from accumulated other comprehensive loss into income (0.2)  
Income Tax Expense (Benefit)    
Net changes in fair value of derivatives   2.1
Net gains (loss) reclassified from accumulated other comprehensive loss into income (0.1)  
Income Tax Expense (Benefit)    
Net changes in fair value of derivatives   $ 6.1
Net gains (loss) reclassified from accumulated other comprehensive loss into income $ (0.1)