COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Letters of Credit
Outstanding letters of credit	$ 79.8	$ 11.5
Purchase Commitments
Amount of prepaid long-term purchase commitments capitalized	9.1	19.4
Aggregate amount of payments made under long-term raw material purchase agreements	96.1	110.9	187.1
Amount of raw material purchases	370
Account payable for raw material purchases	35.1
Number of full-time employees	6,000
Number of employees employed under collective bargaining agreements	1,600
Percentage of employees employed under collective bargaining agreements	27.00%
Environmental Regulation
Accrual of remediation costs	64
Current reserves for environmental contingencies	12
Number of plant site locations	2
RS Cogen
Purchase Commitments
Ownership interest (as a percent)	50.00%
Future commitment per year to purchase electricity and steam from the joint venture	23.5
Aggregate future commitment to purchase electricity and steam from the joint venture	212
Purchases under future commitment	22.9
Minimum
Letters of Credit
Terms of letters of credit	1 month
Maximum
Letters of Credit
Terms of letters of credit	1 year
Lake Charles, LA facility
Environmental Regulation
Accrual of remediation costs	25
Natrium, West Virginia facility
Environmental Regulation
Accrual of remediation costs	14
Lake Charles, South facility
Environmental Regulation
Accrual of remediation costs	$ 15
Natrium, West Virginia facility and Lake Charles, South facility | Minimum
Environmental Regulation
Period during which facilities are operational	65 years