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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
After-Tax Amount        
Accumulated derivative net losses as of December 31, 2015     $ 2,883.3  
Net losses reclassified from accumulated other comprehensive loss into income $ 2.7 $ 2.9 8.7 $ 8.4
Accumulated derivative net losses as of September 30, 2016 2,961.6   2,961.6  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Before-Tax Amount        
Accumulated derivative net losses as of December 31, 2015     (3.3)  
Net changes in fair value of derivatives     (6.2)  
Net losses reclassified from accumulated other comprehensive loss into income     1.1  
Accumulated derivative net losses as of September 30, 2016 (8.4)   (8.4)  
Income Tax        
Accumulated derivative net losses as of December 31, 2015     (1.3)  
Net changes in fair value of derivatives     0.1  
Net losses reclassified from accumulated other comprehensive loss into income     (0.1)  
Accumulated derivative net losses as of September 30, 2016 (1.3)   (1.3)  
After-Tax Amount        
Accumulated derivative net losses as of December 31, 2015     (2.0)  
Net changes in fair value of derivatives     (6.3)  
Net losses reclassified from accumulated other comprehensive loss into income     1.2  
Accumulated derivative net losses as of September 30, 2016 $ (7.1)   $ (7.1)