GOODWILL AND INTANGIBLES (Tables)
 9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying value of goodwill were as follows:

 
Chlor Alkali Products and Vinyls
 
Epoxy
 
Total
 
($ in millions)
Balance at January 1, 2015
$
747.1

 
$
—

 
$
747.1

Acquisition activity
—

 
—

 
—

Balance at September 30, 2015
$
747.1

 
$
—

 
$
747.1

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
0.2

 
0.1

 
0.3

Balance at September 30, 2016
$
1,832.4

 
$
287.0

 
$
2,119.4
Schedule of Finite-Lived Intangible Assets
Intangible assets consisted of the following:

 
 
September 30, 2016
 
December 31, 2015
 
September 30, 2015
 
 
Gross Amount
Accumulated Amortization
Net
 
Gross Amount
Accumulated Amortization
Net
 
Gross Amount
Accumulated Amortization
Net
 
 
($ in millions)
Customers, customer contracts and relationships
 
$
673.3

 
$
(101.2
)
 
$
572.1

 
$
641.0

 
$
(64.0
)
 
$
577.0

 
$
152.9

 
$
(51.9
)
 
$
101.0

Trade name
 
17.9

 
(9.6
)
 
8.3

 
17.9

 
—

 
17.9

 
10.9

 
—

 
10.9

Acquired technology
 
85.1

 
(12.2
)
 
72.9

 
84.7

 
(2.7
)
 
82.0

 
—

 
—

 
—

Other
 
2.3

 
(1.8
)
 
0.5

 
2.3

 
(1.7
)
 
0.6

 
2.3

 
(1.7
)
 
0.6

Total intangible assets
 
$
778.6

 
$
(124.8
)
 
$
653.8

 
$
745.9

 
$
(68.4
)
 
$
677.5

 
$
166.1

 
$
(53.6
)
 
$
112.5