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Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
State
Dec. 31, 2013
Sep. 30, 2013
Accounts Receivable [Abstract]      
Percentage of amounts financed under in-house credit programs, as a percent of net sales (in hundredths) 3.40%   3.90%
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 $ 6.8    
Accounts receivables collectible in two years 0.7    
Accounts receivables collectible beyond two years 0.2    
Allowance for doubtful accounts $ 0.4 $ 0.4  
Account write-off period 9 months    
Number of states in which accounts receivable originated 16