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Components of Earning Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes      
U.S. $ 329.9 $ 300.9 $ 255.7
International 190.9 161.6 146.8
Earnings before provision for income taxes $ 520.8 $ 462.5 $ 402.5