RESTRUCTURING CHARGE (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended		44 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 2.3	$ 1.0	$ 0.2	$ 2.3	$ 3.3	$ 2.5	$ 62.2
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							17.8
Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	1.2	0.2	(0.7)	0.6			18.3
Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0.8	0.7	0.6	1.6			16.1
Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							4.1
Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0	0.1	0.3	0.1			5.2
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0	0	0	0			0.7
Chlor Alkali Products Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	1.7		(0.1)		2.3	1.4	39.1
Chlor Alkali Products Segment | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							17.8
Chlor Alkali Products Segment | Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							5.4
Chlor Alkali Products Segment | Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							14.5
Chlor Alkali Products Segment | Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							0
Chlor Alkali Products Segment | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							0.7
Chlor Alkali Products Segment | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							0.7
Winchester Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0.6		0.3		1.0	1.1	23.1
Winchester Segment | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							0
Winchester Segment | Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							12.9
Winchester Segment | Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							1.6
Winchester Segment | Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							4.1
Winchester Segment | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							4.5
Winchester Segment | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)							$ 0