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INVESTMENTS (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
MW
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
MW
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Investments and related party transactions          
Noncontrolling interest - beginning of period     $ 107,900,000    
Net income (loss) attributable to noncontrolling interest $ (22,900,000) $ 600,000 (19,800,000) $ 2,500,000  
Other comprehensive loss attributable to noncontrolling interest 6,800,000 1,900,000 3,800,000 3,200,000  
Distribution to noncontrolling interest     (8,400,000) (7,700,000)  
Noncontrolling interest - end of period $ 75,900,000   $ 75,900,000    
Several manufacturing joint ventures          
Investments and related party transactions          
Ownership interest (as a percent) 50.00%   50.00%    
RS Cogen          
Investments and related party transactions          
Ownership interest (as a percent) 50.00%   50.00%    
Production capacity of combined cycle natural gas-fired cogeneration facility in Lake Charles, Louisiana (in megawatt) | MW 425   425    
Future commitment per year to purchase electricity and steam from the joint venture     $ 23,500,000    
Aggregate future commitment to purchase electricity and steam from the joint venture $ 167,100,000   167,100,000    
Purchases under future commitment 6,500,000 6,300,000 19,400,000 18,700,000  
RS Cogen | Not a primary beneficiary | Chlorovinyls          
Investments and related party transactions          
Investment in and net advances to RS Cogen 12,100,000   12,100,000   $ 4,600,000
Supply contracts 37,000,000   37,000,000   38,500,000
Maximum exposure to loss $ 49,100,000   $ 49,100,000   $ 43,100,000
TCI          
Investments and related party transactions          
Ownership interest (as a percent) 60.00%   60.00%    
Noncontrolling interest - beginning of period     $ 107,900,000 119,400,000  
Net income (loss) attributable to noncontrolling interest     (19,805,000) 2,413,000  
Other comprehensive loss attributable to noncontrolling interest     (3,800,000) (3,200,000)  
Distribution to noncontrolling interest     (8,400,000) (7,700,000)  
Noncontrolling interest - end of period $ 75,900,000 $ 111,000,000 $ 75,900,000 $ 111,000,000