Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Additional Information (Detail)

v2.4.0.6
Business and Credit Concentrations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Customer
Sep. 30, 2011
Customer
Sep. 30, 2012
Customer
Sep. 30, 2011
Customer
Dec. 31, 2011
Customer
Concentration Risk [Line Items]          
Domestic accounts receivable which do not require collateral from customers $ 128.2   $ 128.2   $ 90.9
Foreign accounts receivable which are collateralized by letters of credit 130.9   130.9   105.5
Losses due to company's credit write-offs 0.3 0.3 1.5 2.8  
Net assets held outside the United States $ 371.4   $ 371.4   $ 325.3
Percentage of Net Sales to Five Largest Customers 16.70% 17.40% 19.20% 18.80%  
Number of customers accounting for more than 10% of sales 0 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   0   1
Percentage of net trade receivables accounted for by one Major customer         12.50%
Percentage of net trade receivables accounted for by another Major customer         10.00%