COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2013 item	Dec. 31, 2012	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Lake Charles, LA facility	Sep. 30, 2013 Calcasieu River Estuary and plant sites	Dec. 31, 2012 Calcasieu River Estuary and plant sites item	Sep. 30, 2013 Natrium, West Virginia facility
Environmental Matters
Accrual of remediation costs	$ 56.7	$ 7.2			$ 23.0	$ 12.0	$ 7.2	$ 14.0
Current reserves for environmental contingencies	1.3
Number of plant site locations	2						4
Expected cash outlays for environmental remediation through 2015			10	20
Cash outlays for environmental remediation in 2016			3	5
Cash outlays for environmental remediation in 2017			3	5
Accrual of remediation costs in non-current liabilities					$ 2.9