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Contingencies and Significant Estimates (Details 2)
$ in Millions
Sep. 30, 2015
USD ($)
Y
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Product liability reserves      
Period over which product liability self-insurance retention levels have fluctuated (in years) | Y 10    
Product Liability Contingency, Accrual, Present Value $ 26.8 $ 24.6  
Product liability reserves for actual cases 4.0 4.0  
Product liability reserves for claims incurred but not reported 22.8 20.6  
Warranty claims reserves 85.3 $ 92.2 $ 99.0
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