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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 $ 3.6 $ 3.0 6.0 $ 5.5
Accumulated derivative net losses as of June 30, 2016 2,982.8   2,982.8  
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     (7.8)  
Net losses reclassified from accumulated other comprehensive loss into income     0.9  
Accumulated derivative net losses as of June 30, 2016 (10.2)   (10.2)  
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     0.0  
Accumulated derivative net losses as of June 30, 2016 (1.4)   (1.4)  
After-Tax Amount        
Accumulated derivative net losses as of December 31, 2015     (2.0)  
Net changes in fair value of derivatives     (7.7)  
Net losses reclassified from accumulated other comprehensive loss into income     0.9  
Accumulated derivative net losses as of June 30, 2016 $ (8.8)   $ (8.8)