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Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
State
Mar. 31, 2012
Accounts Receivable [Abstract]    
Percentage of amounts financed under in-house credit programs, as a percent of net sales (in hundredths) 4.00% 5.00%
Duration of no interest credit programs 12 months  
Term of other programs, minimum 30 days  
Term of other programs, maximum 3 years  
Interest rate of other programs, minimum (in hundredths) 0.00%  
Interest rate of other programs, maximum (in hundredths) 21.00%  
Accounts receivable due per scheduled payment [Abstract]    
Accounts receivables collectible in one year $ 9.3  
Accounts receivables collectible in two years 0.7  
Accounts receivables collectible beyond two years 0.3  
Allowance for doubtful accounts $ 0.4 $ 0.4
Number of states in which accounts receivable originated 17