RESTRUCTURING CHARGES (Tables)

12 Months Ended

Dec. 31, 2015

Restructuring and Related Activities [Abstract]

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

The following table summarizes the 2015, 2014 and 2013 activities by major component of these 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2015:

	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, 2013	$	13.5		$	0.4		$	—		$	—		$	—		$	13.9
2013 restructuring charges (credits)	0.4			(0.4		)	0.6			4.9			—			5.5
Amounts utilized	(3.7		)	—			(0.6		)	(4.9		)	—			(9.2		)
Balance at December 31, 2013	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

Restructuring and Related Costs [Table Text Block]

The following table summarizes the cumulative restructuring charges of these 2014 and 2010 restructuring actions by major component through December 31, 2015:

	Chlor Alkali Products and Vinyls				Winchester		Total
	Becancour		Mercury
	($ in millions)
Write-off of equipment and facility	$	3.5	$	17.8	$	—	$	21.3
Employee severance and job related benefits	2.7		5.6		13.1		21.4
Facility exit costs	0.6		15.6		2.2		18.4
Pension and other postretirement benefits curtailment	—		—		4.1		4.1
Employee relocation costs	—		0.9		5.3		6.2
Lease and other contract termination costs	5.2		0.7		—		5.9
Total cumulative restructuring charges	$	12.0	$	40.6	$	24.7	$	77.3