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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold $ (135.4) $ (132.7) $ (396.6) $ (391.3)
Income tax expense (4.3) (1.5) (13.0) (12.9)
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     3.2  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold     (0.1)  
Total before tax     (0.1)  
Income tax expense     0  
Total reclassifications     (0.1)  
Reclassification out of Accumulated Other Comprehensive Income [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     5.0  
Total before tax     4.1  
Income tax expense     (0.8)  
Total reclassifications     $ 3.3