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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold $ (125.6) $ (121.8) $ (261.2) $ (258.6)
Income tax expense (3.8) (4.0) (8.7) (11.4)
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     2.0  
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     (0.6)  
Amortization of actuarial net losses     3.3  
Total before tax     2.7  
Income tax expense     (0.6)  
Total reclassifications     $ 2.1