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Restructuring and Other Charges - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, before tax $ 18.5 $ 19.3 $ 22.7
Restructuring and other charges, after tax $ 12.3