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DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Copper Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount $ 48.9 $ 45.2 $ 42.1
Zinc Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount 8.3 8.4 8.0
Natural Gas Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount $ 65.6 $ 39.2 $ 38.4