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INVESTMENTS AND RELATED PARTY TRANSACTIONS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 28, 2013
Investments and related party transactions
Gain on acquisition of controlling interest		$ 25.9
Reconciliation of minority interest
Noncontrolling interest beginning balance	119.4us-gaap_MinorityInterest
Net income attributable to noncontrolling interest	3.9	2.7
Noncontrolling interest recognized in connection with the merger		130.0
Distribution to noncontrolling interest	(7.7)	(13.3)
Noncontrolling interest ending balance	107.9us-gaap_MinorityInterest	119.4us-gaap_MinorityInterest
Chlorovinyls
Investments and related party transactions
Investment in joint ventures	11.0	11.7
Receivables due from affiliates	5.5	5.0
Amounts due to affiliates	0.4	1.9
Maximum exposure to loss
Equity in earnings from joint ventures	0.6	0.8	0.7
Reconciliation of minority interest
Liabilities due to related parties	0.4	1.9
Building Products
Investments and related party transactions
Investment in joint ventures	2.5	2.5
Receivables due from affiliates	1.2	1.0
Amounts due to affiliates	8.8	11.6	14.9
Maximum exposure to loss
Equity in earnings from joint ventures	0.3		2.2
Reconciliation of minority interest
Liabilities due to related parties	8.8	11.6	14.9
RS Cogen
Investments and related party transactions
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	186.5
Purchases under future commitment	25.0	22.9
RS Cogen \| Chlorovinyls
Investments and related party transactions
Ownership interest (as a percent)	50.00%
Investment in joint ventures	4.6	10.9
RS Cogen \| Not a primary beneficiary \| Chlorovinyls
Maximum exposure to loss
Investment in and advances to RS Cogen	4.6	10.9
Supply contracts	38.5	40.6
Maximum exposure to loss	43.1	51.5
Several manufacturing joint ventures \| Building Products
Investments and related party transactions
Ownership interest (as a percent)	50.00%
TCI
Investments and related party transactions
Ownership interest (as a percent)	60.00%
Reconciliation of minority interest
Noncontrolling interest beginning balance	119.4
Net income attributable to noncontrolling interest	3.9	2.7
Other comprehensive loss attributable to noncontrolling interest	(7.7)
Noncontrolling interest recognized in connection with the merger		130.0
Distribution to noncontrolling interest	(7.7)	(13.3)
Noncontrolling interest ending balance	107.9	119.4
PHH \| Chlorovinyls
Investments and related party transactions
Ownership interest acquired (as a percent)				50.00%
Ownership interest prior to the merger (as a percent)				50.00%
Gain on acquisition of controlling interest		25.9
Shriram Vinyl Polytech Private Limited \| Chlorovinyls
Investments and related party transactions
Ownership interest (as a percent)	50.00%
Investment in joint ventures	5.8
Vinyl Solutions LLC \| Chlorovinyls
Investments and related party transactions
Ownership interest (as a percent)		50.00%
Investment in joint ventures	$ 0.6	$ 0.7