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Income Taxes - Schedule Of Provision For Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Current income taxes, Federal $ 352.1 $ 207.0 $ 148.7
Current income taxes, State 13.0 13.4 8.4
Current income taxes, Foreign 8.7 5.4 7.6
Current income taxes 373.8 225.8 164.7
Deferred income taxes, Federal 65.5 18.3 7.5
Deferred income taxes, State (0.4) 0.6 0.5
Deferred income taxes, Foreign (2.4) 0.2 (3.0)
Deferred income taxes 62.7 19.1 5.0
Total income tax expense $ 436.5 $ 244.9 $ 169.7