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Accounting Policies - Revision of Prior Year Adjustments (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in Accounting Estimate [Line Items]        
Selling, general and administrative expenses $ (141.9) $ (119.0) $ (158.3)  
Operating income 90.6 96.5 47.2  
Income before income taxes 92.8 93.3 50.2  
Income taxes (15.0) (26.4) (3.1)  
Net income 77.8 66.9 47.1  
Retained earnings 327.5 261.7 241.5 194.4
Accumulated other comprehensive loss (153.9) (152.1) (102.1) (115.5)
As Previously Reported [Member]
       
Change in Accounting Estimate [Line Items]        
Selling, general and administrative expenses   (117.1) (155.9)  
Operating income   98.4 49.6  
Income before income taxes   95.2 52.6  
Income taxes   (26.9) (3.7)  
Net income   68.3 48.9  
Retained earnings   281.0 259.4 210.5
Accumulated other comprehensive loss   (171.4) (120.0) (131.6)
Adjustment [Member]
       
Change in Accounting Estimate [Line Items]        
Selling, general and administrative expenses   (1.9) (2.4)  
Operating income   (1.9) (2.4)  
Income before income taxes   (1.9) (2.4)  
Income taxes   0.5 0.6  
Net income   (1.4) (1.8)  
Retained earnings   (19.3) (17.9) (16.1)
Accumulated other comprehensive loss   $ 19.3 $ 17.9 $ 16.1