GOODWILL AND INTANGIBLES (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in the carrying value of goodwill were as follows:

	Chlor Alkali Products and Vinyls			Epoxy			Total
	($ in millions)
Balance at January 1, 2016	$	1,877.5		$	296.6		$	2,174.1
Acquisition activity	(45.3		)	(9.7		)	(55.0		)
Foreign currency translation adjustment	(0.9		)	(0.2		)	(1.1		)
Balance at December 31, 2016	1,831.3			286.7			2,118.0
Foreign currency translation adjustment	1.6			0.4			2.0
Balance at December 31, 2017	$	1,832.9		$	287.1		$	2,120.0

Schedule of Finite-Lived Intangible Assets [Table Text Block]

Intangible assets consisted of the following:

		December 31,
		2017							2016
	Useful Lives	Gross Amount		Accumulated Amortization			Net		Gross Amount		Accumulated Amortization			Net
		($ in millions)
Customers, customer contracts and relationships	10-15 Years	$	679.5	$	(163.6	)	$	515.9	$	667.8	$	(112.9	)	$	554.9
Trade name	5 Years	7.1		(3.2		)	3.9		17.8		(12.7		)	5.1
Acquired technology	7 Years	86.1		(27.7		)	58.4		84.2		(15.0		)	69.2
Other	4-10 Years	2.3		(2.0		)	0.3		2.3		(1.9		)	0.4
Total intangible assets		$	775.0	$	(196.5	)	$	578.5	$	772.1	$	(142.5	)	$	629.6