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Reclassifications Out of Accumulated Other Comprehensive Loss - Summary of Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes $ 41.4 $ 25.4 $ 117.1 $ 68.2
Income tax expense $ (5.8) $ (4.6) (29.1) $ (12.0)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     2.4  
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     (0.9)  
Amortization of actuarial net losses     3.9  
Income before income taxes     3.0  
Income tax expense     (0.6)  
Total reclassifications     $ 2.4