Quarterly report pursuant to Section 13 or 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
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Customer
Mar. 31, 2012
Customer
Dec. 31, 2012
Concentration Risk [Line Items]      
Domestic accounts receivable which do not require collateral from customers $ 156.9   $ 111.8
Foreign accounts receivable which are collateralized by letters of credit 144.5   118.8
Losses (recoveries) due to company's credit write-off's 0.5   (0.3)
Net assets held outside the United States $ 346.9   $ 387.2
Number of customers accounting for more than 10% of sales 0 0  
Number of customers accounting for more than 10% of accounts receivable 0 0  
Number of largest customers 5    
Percentage of net sales to largest customers 18.00% 17.80%