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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
After-Tax Amount          
Balance beginning of period $ 4,053.9 $ 4,656.8      
Balance end of period 4,148.8 4,148.8      
Equity, Including Portion Attributable to Noncontrolling Interest (4,148.8) (4,148.8) $ (4,355.6) $ (4,139.0) $ (3,882.6)
Deferred Gains and Losses on Derivatives          
Before-Tax Amount          
Accumulated derivative net gains (losses) as the beginning of the period 6.8 (1.3)      
Net changes in fair value of derivatives (0.1) 3.9      
Net losses reclassified from accumulated other comprehensive loss into income 2.1 6.2      
Accumulated derivative net gains (losses) as of the end of the period 8.8 8.8      
Income Tax Expense (Benefit)          
Accumulated derivative net gains (losses) as of the beginning of the period 2.7 (0.5)      
Net changes in fair value of derivatives 0.2 3.1      
Net losses reclassified from accumulated other comprehensive loss into income 0.2 0.5      
Accumulated derivative net gains (losses) as of the end of the period 3.1 3.1      
After-Tax Amount          
Balance beginning of period 4.1 (0.8)      
Other comprehensive loss before reclassifications (0.3) 0.8      
Net losses reclassified from accumulated other comprehensive loss into income 1.9 5.7      
Balance end of period 5.7 5.7      
Equity, Including Portion Attributable to Noncontrolling Interest $ (5.7) $ (5.7)