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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, 2020
Dec. 31, 2019
Dec. 31, 2018
After-Tax Amount      
Total Stockholderss Equity, Including Noncontrolling Interest, Beginning balance $ 2,907.0 $ 2,993.5 $ 3,095.3
Net losses reclassified from accumulated other comprehensive loss into income 8.9 13.3  
Total Stockholders' Equity, Including Noncontrolling Interest, Ending balance 3,018.0 2,907.0 2,993.5
Deferred Net Gains (Losses) on Derivatives      
Before-Tax Amount      
Accumulated derivative net gains, beginning of period (1.5) 1.6 (6.0)
Net changes in fair value of derivatives 4.9 (3.0) (1.0)
Net losses reclassified from accumulated other comprehensive loss into income (6.4) (0.1) 8.6
Accumulated derivative net gains, end of period (3.0) (1.5) 1.6
Income Tax      
Accumulated derivative net gains, beginning of period (0.2) 0.2 (1.3)
Net changes in fair value of derivatives (0.2) (0.4) 0.1
Net losses reclassified from accumulated other comprehensive loss into income (0.1) 0.0 1.4
Accumulated derivative net gains, end of period (0.5) (0.2) 0.2
After-Tax Amount      
Total Stockholderss Equity, Including Noncontrolling Interest, Beginning balance (1.3) 1.4 (4.7)
Net changes in fair value of derivatives 5.1 (2.6) (1.1)
Net losses reclassified from accumulated other comprehensive loss into income (6.3) (0.1) 7.2
Total Stockholders' Equity, Including Noncontrolling Interest, Ending balance $ (2.5) $ (1.3) $ 1.4