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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income before income taxes $ 152.3 $ 110.9 $ 92.8
Income tax expense (32.8) $ (26.8) $ (15.0)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications 8.5    
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | Foreign Currency Translation Items [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Disposal of subsidiary 5.3    
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | Defined Benefit Pension Plan Items [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of prior service credit (1.2)    
Amortization of actuarial net losses 5.2    
Income before income taxes 4.0    
Income tax expense (0.8)    
Total reclassifications $ 3.2