RESTRUCTURING CHARGES (Tables)

12 Months Ended

Dec. 31, 2016

Restructuring and Related Activities [Abstract]

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

The following table summarizes the 2016, 2015 and 2014 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2016:

	Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
	($ in millions)
Balance January 1, 2014	$	10.2		$	—		$	—		$	—		$	—		$	10.2
2014 restructuring charges	4.5			4.5			0.5			2.9			3.3			15.7
Amounts utilized	(3.5		)	—			(0.5		)	(2.9		)	(3.3		)	(10.2		)
Balance at December 31, 2014	11.2			4.5			—			—			—			15.7
2015 restructuring charges	—			0.7			0.6			0.9			0.5			2.7
Amounts utilized	(6.0		)	(2.9		)	(0.6		)	(0.9		)	(0.5		)	(10.9		)
Currency translation adjustments	(0.6		)	(0.2		)	—			—			—			(0.8		)
Balance at December 31, 2015	4.6			2.1			—			—			—			6.7
2016 restructuring charges	5.1			13.6			2.1			15.5			76.6			112.9
Amounts utilized	(6.3		)	(8.2		)	(2.1		)	(13.7		)	(76.6		)	(106.9		)
Balance at December 31, 2016	$	3.4		$	7.5		$	—		$	1.8		$	—		$	12.7

Restructuring and Related Costs [Table Text Block]

The following table summarizes the cumulative restructuring charges of these 2016, 2014 and 2010 restructuring actions by major component through December 31, 2016:

	Chlor Alkali Products and Vinyls						Winchester		Total
	Becancour		Capacity Reductions		Mercury
	($ in millions)
Write-off of equipment and facility	$	3.5	$	76.6	$	17.8	$	—	$	97.9
Employee severance and job related benefits	2.7		5.1		5.6		13.1		26.5
Facility exit costs	1.3		14.7		15.6		2.3		33.9
Pension and other postretirement benefits curtailment	—		—		—		4.1		4.1
Employee relocation costs	—		1.4		0.9		6.0		8.3
Lease and other contract termination costs	5.3		13.5		0.7		—		19.5
Total cumulative restructuring charges	$	12.8	$	111.3	$	40.6	$	25.5	$	190.2