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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
After-Tax Amount        
Balance beginning of period     $ 3,095.3  
Net losses reclassified from accumulated other comprehensive loss into income $ 4.5 $ 4.1 8.8 $ 8.3
Balance end of period 2,998.1   2,998.1  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Before-Tax Amount        
Accumulated derivative net losses as the beginning of the period     (6.0)  
Net changes in fair value of derivatives     (2.4)  
Net losses reclassified from accumulated other comprehensive loss into income     2.8  
Accumulated derivative net losses as of the end of the period (5.6)   (5.6)  
Income Tax        
Accumulated derivative net losses as of the beginning of the period     (1.3)  
Net changes in fair value of derivatives     (0.3)  
Net losses reclassified from accumulated other comprehensive loss into income     0.1  
Accumulated derivative net losses as of the end of the period (1.5)   (1.5)  
After-Tax Amount        
Balance beginning of period     (4.7)  
Net changes in fair value of derivatives     (2.1)  
Net losses reclassified from accumulated other comprehensive loss into income     2.7  
Balance end of period $ (4.1)   $ (4.1)