RESTRUCTURING CHARGES (Tables)

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

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

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

	Employee severance and related benefit costs			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
	($ in millions)
Balance at January 1, 2017	$	3.4		$	7.5		$	—		$	1.8		$	—		$	12.7
2017 restructuring charges	2.0			22.1			0.3			11.7			1.5			37.6
Amounts utilized	(3.6		)	(26.3		)	(0.3		)	(13.5		)	(1.5		)	(45.2		)
Balance at December 31, 2017	1.8			3.3			—			—			—			5.1
2018 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
2019 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 and Related Costs [Table Text Block]

The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through December 31, 2019:

	Chlor Alkali Products and Vinyls						Winchester				Total
	Becancour		Capacity Reductions		Freeport		Oxford		Other
	($ 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		6.6		—		14.7		2.7		26.7
Facility exit costs	5.9		48.2		—		2.3		0.2		56.6
Pension and other postretirement benefits curtailment	—		—		—		4.1		—		4.1
Employee relocation costs	—		1.7		—		6.0		—		7.7
Lease and other contract termination costs	6.1		40.9		—		—		0.4		47.4
Total cumulative restructuring charges	$	18.2	$	175.5	$	58.9	$	27.1	$	5.9	$	285.6