RESTRUCTURING CHARGE (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		41 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.0	$ 2.3	$ 59.9
Write-off of equipment and facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			17.5
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.2	0.6	17.1
Facility Exit Costs (asset retirement obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.7	1.6	15.3
Pension and other postretirement benefits curtailment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4.1
Employee Relocation Cost [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1	0.1	5.2
Lease and Other Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	0.7
Chlor Alkali Products Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6	1.5	37.4
Chlor Alkali Products Segment [Member] | Write-off of equipment and facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			17.5
Chlor Alkali Products Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4.7
Chlor Alkali Products Segment [Member] | Facility Exit Costs (asset retirement obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			13.8
Chlor Alkali Products Segment [Member] | Pension and other postretirement benefits curtailment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Chlor Alkali Products Segment [Member] | Employee Relocation Cost [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.7
Chlor Alkali Products Segment [Member] | Lease and Other Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.7
Winchester Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	0.8	22.5
Winchester Segment [Member] | Write-off of equipment and facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Winchester Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			12.4
Winchester Segment [Member] | Facility Exit Costs (asset retirement obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1.5
Winchester Segment [Member] | Pension and other postretirement benefits curtailment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4.1
Winchester Segment [Member] | Employee Relocation Cost [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4.5
Winchester Segment [Member] | Lease and Other Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 0