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Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
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
9 Months Ended 12 Months Ended
Sep. 30, 2020
CAD ($)
lb
gal
MMBTU
MWh
Dec. 31, 2019
CAD ($)
MMBTU
lb
gal
MWh
Natural Gas [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Derivative, Nonmonetary Notional Amount | MMBTU 29.7 20.1
Diesel [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Derivative, Nonmonetary Notional Amount | gal 0.0 0.8
Zinc [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Derivative, Nonmonetary Notional Amount | lb 10.9 0.0
Electricity [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh 0.8 0.0
Canada, Dollars | Foreign Exchange Contract [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Derivative, Notional Amount | $ $ 38.8 $ 0.0