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 |