RESTRUCTURING CHARGE (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended		32 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.2	$ 2.3	$ 1.8	$ 1.9	$ 2.5	$ 3.7	$ 55.9
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	(0.7)	0.6	1.0	0.9			16.4
Facility Exit Costs (asset retirement obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6	1.6	0.1	0.2			12.0
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	0.3	0.1	0.7	0.8			4.8
Lease and Other Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	0	0			1.1
Winchester Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3		1.6		1.1	3.2	21.4
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							11.7
Winchester Segment [Member] | Facility Exit Costs (asset retirement obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges							1.2
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							4.4
Winchester Segment [Member] | Lease and Other Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges							0
Chlor Alkali Products Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(0.1)		0.2		1.4	0.5	34.5
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							10.8
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							0.4
Chlor Alkali Products Segment [Member] | Lease and Other Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges							$ 1.1