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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, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
After-Tax Amount            
Total stockholders’ equity $ 3,164.8 $ 3,124.7 $ 3,018.0 $ 2,717.5 $ 2,690.6 $ 2,907.0
Balance end of period 3,164.8          
Deferred Net Gains (Losses) on Derivatives            
Before-Tax Amount            
Accumulated derivative net gains (losses) as the beginning of the period (3.0)          
Net changes in fair value of derivatives 9.6          
Net losses reclassified from accumulated other comprehensive loss into income 5.0          
Accumulated derivative net gains (losses) as of the end of the period 11.6          
Income Tax            
Accumulated derivative net gains (losses) as of the beginning of the period (0.5)          
Net changes in fair value of derivatives 3.5          
Net losses reclassified from accumulated other comprehensive loss into income 0.8          
Accumulated derivative net gains (losses) as of the end of the period 3.8          
After-Tax Amount            
Total stockholders’ equity 7.8   $ (2.5)      
Net changes in fair value of derivatives 6.1          
Net losses reclassified from accumulated other comprehensive loss into income 4.2          
Balance end of period $ 7.8