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DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Copper Commodity Forward Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 38.9 | $ 35.8 | $ 43.1
Zinc Commodity Forward Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | 8.0 | 8.0 | 8.5
Lead Commodity Forward Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | 1.4 | 3.4 | 9.1
Natural Gas Commodity Forward Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 53.0 | $ 54.4 | $ 0.9

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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