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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
After-Tax Amount        
Balance beginning of period $ 2,717.5 $ 3,128.7 $ 2,907.0 $ 2,993.5
Net gains reclassified from accumulated other comprehensive loss into income 2.4 1.1 6.1 8.2
Balance end of period 2,849.9 $ 3,038.8 2,849.9 $ 3,038.8
Deferred Net Gains (Losses) on Derivatives        
Before-Tax Amount        
Accumulated derivative net gains (losses) as the beginning of the period     (1.5)  
Net changes in fair value of derivatives     8.9  
Net gains reclassified from accumulated other comprehensive loss into income     (4.4)  
Accumulated derivative net gains (losses) as of the end of the period 3.0   3.0  
Income Tax        
Accumulated derivative net gains (losses) as of the beginning of the period     (0.2)  
Net changes in fair value of derivatives     0.8  
Income tax provision     (0.2)  
Accumulated derivative net gains (losses) as of the end of the period 0.4   0.4  
After-Tax Amount        
Balance beginning of period     (1.3)  
Net changes in fair value of derivatives     8.1  
Net gains reclassified from accumulated other comprehensive loss into income     (4.2)  
Balance end of period $ 2.6   $ 2.6