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Reclassifications Out of Accumulated Other Comprehensive Income/(Loss) - Summary of Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense $ (5.3) $ (3.8) $ (7.4) $ (8.7)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     1.6  
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     (0.7)  
Amortization of actuarial net losses     2.8  
Total before tax     2.1  
Income tax expense     (0.5)  
Total reclassifications     $ 1.6