DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Derivative [Line Items]
Notional amount	$ 225.1	$ 174.6	$ 186.1
Forward Contracts
Derivative [Line Items]
Notional amount	176.6	140.6	130.8
Forward Contracts Sell
Derivative [Line Items]
Notional amount	111.7	99.2	120.5
Natural Gas Commodity Forward Contracts
Derivative [Line Items]
Notional amount	59.3	62.9	67.1
Ethane Commodity Forward Contracts
Derivative [Line Items]
Notional amount	48.2	51.5	53.4
Metals Commodity Forward Contracts
Derivative [Line Items]
Notional amount	$ 117.6	$ 60.2	$ 65.6