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DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Copper Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount $ 50.9 $ 45.2 $ 42.8
Zinc Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount 8.6 8.4 7.9
Natural Gas Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount $ 79.6 $ 39.2 $ 45.0