DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Copper Commodity Forward Contracts
Derivative [Line Items]
Notional amount	$ 51.3	$ 45.2	$ 38.9
Zinc Commodity Forward Contracts
Derivative [Line Items]
Notional amount	8.2	8.4	8.0
Lead Commodity Forward Contracts
Derivative [Line Items]
Notional amount	0.0	0.0	1.4
Natural Gas Commodity Forward Contracts
Derivative [Line Items]
Notional amount	$ 68.9	$ 39.2	$ 53.0