Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations (Details)

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Business and Credit Concentrations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Concentration Risk [Line Items]          
Total Manufacturers Produced 63.60% 73.10% 63.80% 71.30%  
Business and Credit Concentration (Textuals) [Abstract]          
Domestic accounts receivable which do not require collateral from customers $ 163.1   $ 163.1   $ 164.4
Foreign accounts receivable which are collateralized by letters of credit 135.8   135.8   121.4
Losses due to company's credit write-offs 1.8 0.2 2.5 1.6  
Net assets held outside the United States $ 356.8   $ 356.8   $ 322.0
Company's net sales to its five largest customers 25.20% 31.30% 20.10% 28.20%  
Number of customers accounting for more than 10% of sales 0 1 0 0  
Number of customers accounting for more than 10% of accounts receivable 0 1      
Percentage of outstanding accounts receivable held by one customer   15.10%   15.10%  
Percentage Of Net Sales Accounted By One Customer   10.90%   10.90%  
Companies Top Five Manufacturers Produced
          
Concentration Risk [Line Items]          
Manufacturer #1 31.70% 36.80% 30.80% 34.60%  
Manufacturer #2 11.20% 14.20% 11.40% 13.30%  
Manufacturer #3 7.60% 9.40% 8.60% 10.10%  
Manufacturer #4 6.80% 8.10% 6.70% 8.60%  
Manufacturer #5 6.30% 4.60% 6.30% 4.70%