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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes $ 51.8 $ 23.8 $ 75.7 $ 42.8
Income tax expense $ (17.3) $ (5.3) (23.3) $ (7.4)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     1.5  
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     (0.6)  
Amortization of actuarial net losses     2.6  
Income before income taxes     2.0  
Income tax expense     (0.5)  
Total reclassifications     $ 1.5