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, MMBTU in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
CAD ($)
MMBTU
lb
gal
Mar. 31, 2019
MMBTU
lb
gal
Dec. 31, 2019
CAD ($)
Natural Gas [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 50.4 20.1  
Diesel [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount, Volume 0.0 0.8  
Derivative, Nonmonetary Notional Amount, Mass | lb 28.8 0.0  
Electricity [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount, Volume 1.5 0.0  
Canada, Dollars | Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Derivative, Notional Amount | $ $ 58.7   $ 0.0