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DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Copper Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount $ 42.8 $ 35.8 $ 38.7
Zinc Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount 7.9 8.0 8.0
Lead Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount 0.0 3.4 8.4
Natural Gas Commodity Forward Contracts      
Derivative [Line Items]      
Notional amount $ 45.0 $ 54.4 $ 0.4