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Contingencies and Significant Estimates (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Y
Dec. 31, 2012
Dec. 31, 2011
Product liability reserves      
Period over which product liability self-insurance retention levels have fluctuated (in years) 5    
Product liability reserves $ 26.5 $ 27.9  
Product liability reserves for actual cases 4.5 6.3  
Product liability reserves for claims incurred but not reported 22.0 21.6  
Warranty claims reserves 101.8 101.4 103.7
Minimum
      
Product liability reserves      
Product liability self-insurance retention levels per occurrence 0.1    
Maximum
      
Product liability reserves      
Product liability self-insurance retention levels per occurrence 3.0    
Product liability self-insurance maximum retention level for new occurrence $ 2.0