GOODWILL AND INTANGIBLES (Details 1) - USD ($) $ in Millions |
9 Months Ended | |||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Goodwill [Line Items] | ||||
| Goodwill | $ 2,119.8 | $ 2,119.4 | $ 2,118.0 | $ 2,174.1 |
| Acquisition activity | (55.0) | |||
| Foreign currency translation adjustment | 1.8 | 0.3 | ||
| Chlor Alkali Products and Vinyls Segment | ||||
| Goodwill [Line Items] | ||||
| Goodwill | 1,832.7 | 1,832.4 | 1,831.3 | 1,877.5 |
| Acquisition activity | (45.3) | |||
| Foreign currency translation adjustment | 1.4 | 0.2 | ||
| Epoxy Segment | ||||
| Goodwill [Line Items] | ||||
| Goodwill | 287.1 | 287.0 | $ 286.7 | $ 296.6 |
| Acquisition activity | (9.7) | |||
| Foreign currency translation adjustment | $ 0.4 | $ 0.1 | ||