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Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
State
Dec. 31, 2012
Jun. 30, 2012
Accounts Receivable [Abstract]      
Percentage of amounts financed under in-house credit programs, as a percent of net sales (in hundredths) 4.00%   5.10%
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 $ 8.5    
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 16