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GOODWILL AND INTANGIBLES (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2016
$
1,877.5

 
$
296.6

 
$
2,174.1

Acquisition activity
(23.3
)
 
(5.5
)
 
(28.8
)
Foreign currency translation adjustment
0.6

 
0.2

 
0.8

Balance at March 31, 2016
$
1,854.8

 
$
291.3

 
$
2,146.1

Balance at January 1, 2017
$
1,831.3

 
$
286.7

 
2,118.0

Foreign currency translation adjustment
0.8

 
0.2

 
1.0

Balance at March 31, 2017
$
1,832.1

 
$
286.9

 
$
2,119.0
Schedule of Finite-Lived Intangible Assets
Intangible assets consisted of the following:

 
 
March 31, 2017
 
December 31, 2016
 
March 31, 2016
 
 
Gross Amount
Accumulated Amortization
Net
 
Gross Amount
Accumulated Amortization
Net
 
Gross Amount
Accumulated Amortization
Net
 
 
($ in millions)
Customers, customer contracts and relationships
 
$
669.2

 
$
(125.3
)
 
$
543.9

 
$
667.8

 
$
(112.9
)
 
$
554.9

 
$
643.8

 
$
(75.9
)
 
$
567.9

Trade name
 
6.9

 
(2.1
)
 
4.8

 
17.8

 
(12.7
)
 
5.1

 
17.9

 
(2.7
)
 
15.2

Acquired technology
 
84.4

 
(18.1
)
 
66.3

 
84.2

 
(15.0
)
 
69.2

 
85.2

 
(5.7
)
 
79.5

Other
 
2.3

 
(1.9
)
 
0.4

 
2.3

 
(1.9
)
 
0.4

 
2.3

 
(1.7
)
 
0.6

Total intangible assets
 
$
762.8

 
$
(147.4
)
 
$
615.4

 
$
772.1

 
$
(142.5
)
 
$
629.6

 
$
749.2

 
$
(86.0
)
 
$
663.2