DERIVATIVE INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value

The following table presents the fair value of our derivative instruments and the classification of each in the Statements of Unaudited Condensed Consolidated Financial Position:

	Derivatives designated as hedging instruments under Topic 815:				Derivatives not designated as hedging instruments under Topic 815:
Derivative Asset (Liability)	September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019
Other current assets:
Customer supply agreement	$	—	$	—	$	34.5	$	44.5
Provisional pricing arrangements	—		—		26.9		1.3
Commodity contracts	7.9		—		7.9		—
Other non-current assets:
Commodity contracts	1.8		—		—		—
Other current liabilities:
Provisional pricing arrangements	—		—		(0.3)		(1.1)
Commodity contracts	(1.8)		(3.2)		(6.9)		—
Foreign exchange contracts	(0.6)		—		—		—
Other non-current liabilities:
Foreign exchange contracts	(0.1)		—		—		—

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The following table presents the notional amount of our outstanding hedge contracts:

		(In Millions)
		September 30, 2020			December 31, 2019
	Unit of Measure	Maturity Dates	Notional Amount		Notional Amount
Commodity contracts:
Natural gas	MMBtu	October 2020 - December 2021	29.7		20.1
Diesel	Gallons	—	—		0.8
Zinc	Pounds	October 2020 - December 2021	10.9		—
Electricity	Megawatt hours	October 2020 - December 2021	0.8		—
Foreign exchange contracts:
Canadian dollars	CAD	October 2020 - December 2021	C$	38.8	C$	—

Derivative Instruments, Gain (Loss) [Table Text Block]

Estimated gains before tax expected to be reclassified into Cost of goods sold within the next 12 months for our existing derivatives that qualify as cash flow hedges are presented below:

	(In Millions)
Hedge:	Estimated Gains
Natural gas	$	10.8
Zinc	2.3
Electricity	1.1
Canadian dollars	0.2

Schedule Of Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance Location Table

The following summarizes the effect of our derivatives that are not designated as hedging instruments in the Statements of Unaudited Condensed Consolidated Operations:

		(In Millions)
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Three Months Ended September 30,				Nine Months Ended September 30,
		2020		2019		2020		2019
Customer supply agreements	Revenues	$	8.8	$	7.6	$	14.4	$	82.2
Provisional pricing arrangements	Revenues	20.4		(48.5)		28.0		(38.8)
Commodity contracts	Cost of goods sold	3.9		—		(0.8)		—
Total		$	33.1	$	(40.9)	$	41.6	$	43.4