RESTRUCTURING CHARGES (Tables)

12 Months Ended

Dec. 31, 2020

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

The following table summarizes the 2020, 2019 and 2018 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2020, 2019 and 2018:

	Employee severance and related benefit costs		Lease and other contract termination costs		Facility exit costs		Write-off of equipment and facility		Total
	($ in millions)
Balance at January 1, 2018	$	1.8	$	3.3	$	—	$	—	$	5.1
Restructuring charges	1.7		5.6		12.0		2.6		21.9
Amounts utilized	(2.0)		(2.9)		(11.3)		(2.6)		(18.8)
Balance at December 31, 2018	1.5		6.0		0.7		—		8.2
Restructuring charges	2.1		0.9		14.6		58.9		76.5
Amounts utilized	(3.6)		(3.8)		(15.3)		(58.9)		(81.6)
Balance at December 31, 2019	—		3.1		—		—		3.1
Restructuring charges	2.2		1.4		5.4		—		9.0
Amounts utilized	(0.4)		(2.8)		(5.4)		—		(8.6)
Balance at December 31, 2020	$	1.8	$	1.7	$	—	$	—	$	3.5

Restructuring and Related Costs [Table Text Block]

The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through December 31, 2020:

	Chlor Alkali Products and Vinyls								Total
	Becancour		Capacity Reductions		Freeport		Winchester
	($ in millions)
Write-off of equipment and facility	$	3.5	$	78.1	$	58.9	$	2.6	$	143.1
Employee severance and related benefit costs	2.7		6.7		2.1		2.7		14.2
Facility exit costs	5.9		52.0		1.7		0.2		59.8
Employee relocation costs	—		1.7		—		—		1.7
Lease and other contract termination costs	6.1		42.2		—		0.4		48.7
Total cumulative restructuring charges	$	18.2	$	180.7	$	62.7	$	5.9	$	267.5