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Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current      
Federal $ 195.4 $ 177.4 $ 143.8
State 47.5 41.6 38.8
Foreign 28.1 22.1 24.1
Income tax expense 271.0 241.1 206.7
Deferred      
Federal 1.8 11.3 27.4
State (0.5) 0.2 0.2
Foreign 1.3 0.2 0.8
Income tax expense 2.6 11.7 28.4
Total      
Federal 197.2 188.7 171.2
State 47.0 41.8 39.0
Foreign 29.4 22.3 24.9
Income tax expense $ 273.6 $ 252.8 $ 235.1