Annual report pursuant to Section 13 and 15(d)

Business And Credit Concentrations - Additional Information (Detail)

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Business And Credit Concentrations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Dec. 31, 2010
Customer
Concentration Risk [Line Items]      
Domestic accounts receivable which do not require collateral from customers $ 111.8 $ 90.9  
Foreign accounts receivable which are collateralized by letters of credit 118.8 105.5  
International net sales 496.0 546.0 484.7
Losses due to company's credit write-off's 1.5 7.0 4.8
Net assets held outside the United States $ 387.2 $ 325.3  
Number of customers accounting for more than 10% of sales 0 0 0
Number of customer accounting for more than 12.5% of Accounts receivable   1  
Number of customers accounting for more than 10% of accounts receivable 0 1 0
Number of largest customers 5    
Percentage of net sales to largest customers 18.10% 17.80% 24.90%