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RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 30 Months Ended | 46 Months Ended | 95 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 3.3 | $ 6.4 | $ 4.0 | $ 9.2 | $ 8.5 | $ 8.2 | $ 13.7 | $ 25.9 |  |  | $ 200.9
Write-off of equipment and facility |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 81.6
Employee severance and related benefit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  | 23.3
Facility exit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 2.7 | 2.6 | 3.6 | 2.2 | 2.6 | 2.3 |  |  |  |  | 38.9
Pension and other postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 4.1
Employee relocation costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 |  |  |  |  | 7.7
Lease and other contract termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 0.3 | $ 3.7 | $ 0.4 | 7.0 | $ 5.8 | $ 5.7 |  |  |  |  | 45.3
Chlor Alkali Products and Vinyls Becancour |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 0.0 |  |  | 0.4 |  |  | 1.3 | 2.2 |  | $ 17.4 |
Chlor Alkali Products and Vinyls Becancour | Write-off of equipment and facility |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 3.5 |
Chlor Alkali Products and Vinyls Becancour | Employee severance and related benefit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 2.7 |
Chlor Alkali Products and Vinyls Becancour | Facility exit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 5.9 |
Chlor Alkali Products and Vinyls Becancour | Pension and other postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 0.0 |
Chlor Alkali Products and Vinyls Becancour | Employee relocation costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 0.0 |
Chlor Alkali Products and Vinyls Becancour | Lease and other contract termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | $ 5.3 |
Chlor Alkali Products and Vinyls Capacity Reductions |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 3.3 |  |  | $ 8.8 |  |  | $ 12.4 | $ 23.7 | $ 156.4 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Write-off of equipment and facility |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 78.1 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Employee severance and related benefit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 5.9 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Facility exit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 30.7 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Pension and other postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 0.0 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Employee relocation costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 1.7 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Lease and other contract termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 40.0 |  |
Winchester Segment |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 27.1
Winchester Segment | Write-off of equipment and facility |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 0.0
Winchester Segment | Employee severance and related benefit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 14.7
Winchester Segment | Facility exit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 2.3
Winchester Segment | Pension and other postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 4.1
Winchester Segment | Employee relocation costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 6.0
Winchester Segment | Lease and other contract termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | $ 0.0

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