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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 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
After-Tax Amount        
Beginning balance $ 2,883.3 $ 2,883.3 $ 3,496.9 $ 4,044.8
Net losses reclassified from accumulated other comprehensive loss into income   10.7 9.4  
Ending balance   2,837.2 2,883.3 3,496.9
Deferred Net Gains (Losses) on Derivatives        
Before-Tax Amount        
Accumulated derivative net gains, beginning of period (3.3) (3.3) (0.2) (0.3)
Net changes in fair value of derivatives (7.8)   (6.2) (1.3)
Net losses reclassified from accumulated other comprehensive loss into income 1.0   3.1 1.4
Accumulated derivative net gains, end of period   (10.1) (3.3) (0.2)
Income Tax        
Accumulated derivative net gains, beginning of period (1.3) (1.3) (0.1) (0.1)
Net changes in fair value of derivatives (0.1)   (1.6) 0.1
Net losses reclassified from accumulated other comprehensive loss into income 0.0   0.4 (0.1)
Accumulated derivative net gains, end of period   (1.4) (1.3) (0.1)
After-Tax Amount        
Beginning balance (2.0) (2.0) (0.1) (0.2)
Net changes in fair value of derivatives (7.7) (7.7) (4.6) (1.4)
Net losses reclassified from accumulated other comprehensive loss into income $ 1.0 1.0 2.7 1.5
Ending balance   $ (8.7) $ (2.0) $ (0.1)