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RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 28 Months Ended | 77 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 8.2 | $ 92.8 |  |  | $ 157.8
Write-off of Equipment and Facility |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 0.0 | 76.6 |  |  | 80.1
Employee severance and job related benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 0.0 | 3.9 |  |  | 20.9
Facility exit costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 2.3 | 2.9 |  |  | 20.6
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 | 0.2 | 0.2 |  |  | 7.6
Lease and other contract termination costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 5.7 | 9.2 |  |  | 24.5
Chlor Alkali Products Becancour |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 0.7 | 0.3 |  | $ 13.5 |
Chlor Alkali Products Becancour | Write-off of Equipment and Facility |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 3.5 |
Chlor Alkali Products Becancour | Employee severance and job related benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 2.7 |
Chlor Alkali Products Becancour | Facility exit costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 2.0 |
Chlor Alkali Products Becancour | Pension and other postretirement benefits curtailment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 0.0 |
Chlor Alkali Products Becancour | Employee relocation costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 0.0 |
Chlor Alkali Products 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 | $ 7.5 | 92.2 | $ 118.8 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Write-off of Equipment and Facility |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 76.6 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Employee severance and job related benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 5.1 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Facility exit costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 16.3 |  |
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 |  |  | 1.6 |  |
Chlor Alkali Products and Vinyls Capacity Reductions | Lease and other contract termination costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 19.2 |  |
Winchester Segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  | $ 0.3 |  |  | 25.5
Winchester Segment | Write-off of Equipment and Facility |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | 0.0
Winchester Segment | Employee severance and job related benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | 13.1
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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