Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Additional Information (Detail)

v2.4.0.8
Business and Credit Concentrations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Customer
Jun. 30, 2012
Customer
Jun. 30, 2013
Customer
Jun. 30, 2012
Customer
Dec. 31, 2012
Risks And Uncertainties [Abstract]          
Domestic accounts receivable which do not require collateral from customers $ 156.9   $ 156.9   $ 111.8
Foreign accounts receivable which are collateralized by letters of credit 112.0   112.0   118.8
Losses due to company's credit write-off's 0.4 1.5 1.0 1.2  
Net assets held outside the United States $ 337.6   $ 337.6   $ 387.2
Number of customers accounting for more than 10% of sales 0 0 0 0  
Number of customers accounting for more than 10% of accounts receivable 0   0    
Number of largest customers 5 5 5 5  
Percentage of net sales to largest customers 19.30% 23.00% 18.60% 20.40%