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Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current      
Federal $ 150.4 $ 130.6 $ 86.9
Foreign 22.3 19.7 12.3
State and other 22.9 16.1 12.0
Deferred      
Federal, state and other (23.9) (11.3) 2.7
Foreign (2.0) (1.7) 4.4
Income tax expense as reported $ 169.7 $ 153.4 $ 118.3