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Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current      
Federal $ 177.4 $ 143.8 $ 270.6
State 41.6 38.8 33.2
Foreign 22.1 24.1 20.5
Income tax expense 241.1 206.7 324.3
Deferred      
Federal 11.3 27.4 (33.1)
State 0.2 0.2 3.3
Foreign 0.2 0.8 0.0
Income tax expense 11.7 28.4 (29.8)
Total      
Federal 188.7 171.2 237.5
State 41.8 39.0 36.5
Foreign 22.3 24.9 20.5
Income tax expense $ 252.8 $ 235.1 $ 294.5