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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue Recognition [Abstract]        
Payments to representatives $ 14.1 $ 12.7 $ 28.1 $ 24.6
Extended product warranties, minimum length     6 months  
Extended product warranties, maximum length     10 years