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Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
After-Tax Amount      
Beginning balance $ 3,095.3 $ 2,837.2 $ 2,883.3
Net losses reclassified from accumulated other comprehensive loss into income 20.2 14.6  
Ending balance 2,993.5 3,095.3 2,837.2
Deferred Net Gains (Losses) on Derivatives      
Before-Tax Amount      
Accumulated derivative net gains, beginning of period (6.0) (10.1) (3.3)
Net changes in fair value of derivatives (1.0) 1.9 (7.8)
Net losses reclassified from accumulated other comprehensive loss into income 8.6 2.2 1.0
Accumulated derivative net gains, end of period 1.6 (6.0) (10.1)
Income Tax      
Accumulated derivative net gains, beginning of period (1.3) (1.4) (1.3)
Net changes in fair value of derivatives 0.1 (0.1) (0.1)
Net losses reclassified from accumulated other comprehensive loss into income 1.4 0.2 0.0
Accumulated derivative net gains, end of period 0.2 (1.3) (1.4)
After-Tax Amount      
Beginning balance (4.7) (8.7) (2.0)
Net changes in fair value of derivatives (1.1) 2.0 (7.7)
Net losses reclassified from accumulated other comprehensive loss into income 7.2 2.0 1.0
Ending balance $ 1.4 $ (4.7) $ (8.7)