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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

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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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