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Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Before-Tax Amount    
Accumulated derivative net gains, Beginning Balance $ (0.2)  
Net changes in fair value of derivatives (2.8)  
Net losses reclassified from accumulated other comprehensive loss into income 1.2  
Accumulated derivative net gains, Ending Balance (1.8)  
Income Tax    
Accumulated derivative net gains, Beginning Balance (0.1)  
Net changes in fair value of derivatives (0.2)  
Net losses reclassified from accumulated other comprehensive loss into income 0.1  
Accumulated derivative net gains, Ending Balance (0.2)  
After-Tax Amount    
Accumulated derivative net gains, Beginning Balance (0.1)  
Net changes in fair value of derivatives (2.6)  
Net losses reclassified from accumulated other comprehensive loss into income 1.1  
Accumulated derivative net gains, Ending Balance $ (0.1) $ (1.6)