Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS - Schedule of Notional Amounts of Outstanding Derivatives (Details)

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DERIVATIVE INSTRUMENTS - Schedule of Notional Amounts of Outstanding Derivatives (Details) - Designated as Hedging Instrument [Member]
lb in Millions, gal in Millions, MWh in Millions, MMBTU in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
CAD ($)
gal
lb
MMBTU
MWh
Dec. 31, 2019
CAD ($)
gal
lb
MMBTU
MWh
Natural Gas [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBTU 39.2 20.1
Diesel [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | gal 0.0 0.8
Zinc [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | lb 18.2 0.0
Electricity [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh 1.5 0.0
Canada, Dollars | Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative, Notional Amount | $ $ 48.7 $ 0.0