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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 31, 2010
Significant Accounting Policies [Line Items]          
Stock split description   On June 1, 2011, the Company effected a two-for-one stock split of the Common Stock in the form of a 100% stock dividend. All applicable amounts in the consolidated financial statements, including earnings per share and related disclosures, have been retroactively adjusted to reflect the stock split.      
Stock split conversion ratio   2      
Stock split, rate of stock dividend   100.00%      
Impact on net sales due to change in calendar periods $ 14.3   $ 14.3   $ (1.0)
Impact in net income due to change in calendar periods         0.1
Percentage of inventory determined using LIFO 24.00% 20.00% 24.00%    
Adjustments to reflect inventory at net realizable value 4.7 5.7 4.7    
Research and development expenses   54.8 55.1 53.7  
Stock compensation expense   11.0 10.0 10.9  
Unvested Stock Options Fair Value
         
Significant Accounting Policies [Line Items]          
Stock compensation expense   12.4      
Selling, General And Administrative Expenses
         
Significant Accounting Policies [Line Items]          
Stock compensation expense   11.0      
Cost of Sales
         
Significant Accounting Policies [Line Items]          
Stock compensation expense   $ 1.4      
Minimum | Building and Building Improvements
         
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   9 years      
Minimum | Machinery and Equipment
         
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   3 years      
Minimum | Office Equipment
         
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   3 years      
Maximum | Software
         
Significant Accounting Policies [Line Items]          
Estimated useful life (years)   10 years      
Maximum | Building and Building Improvements
         
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   40 years      
Maximum | Machinery and Equipment
         
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   20 years      
Maximum | Office Equipment
         
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   10 years      
Armand Products Company
         
Significant Accounting Policies [Line Items]          
Ownership interest, percentage 50.00% 50.00% 50.00% 50.00%  
Armakleen Company
         
Significant Accounting Policies [Line Items]          
Ownership interest, percentage 50.00% 50.00% 50.00% 50.00%  
Natronx Technologies Llc Company
         
Significant Accounting Policies [Line Items]          
Ownership interest, percentage   33.33%