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Segment Information Classified Based on Geographic Location (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Net sales $ 217.7 $ 185.0 $ 204.4 $ 196.1 $ 195.0 $ 167.8 $ 175.6 $ 150.3 $ 803.2 $ 688.7 $ 633.1
Long-lived assets (excluding intangibles) 71.8       62.0       71.8 62.0  
United States
                     
Segment Reporting Information [Line Items]                      
Net sales                 492.7 420.5 374.6
Long-lived assets (excluding intangibles) 54.5       45.4       54.5 45.4  
Europe
                     
Segment Reporting Information [Line Items]                      
Net sales                 259.0 229.0 220.0
Long-lived assets (excluding intangibles) 16.8       16.0       16.8 16.0  
Canada
                     
Segment Reporting Information [Line Items]                      
Net sales                 51.5 39.2 38.5
Long-lived assets (excluding intangibles) $ 0.5       $ 0.6       $ 0.5 $ 0.6