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INVESTMENTS AND RELATED PARTY TRANSACTIONS (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jan. 28, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments and related party transactions        
Estimated gain on acquisition of controlling interest   $ 25.9    
PHH LLC | 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%      
Estimated gain on acquisition of controlling interest 25.9      
Estimated fair value of equity interest before the Merger 27.6      
Investment in joint ventures   0.8 2.2  
Maximum exposure to loss associated with RS Cogen        
Sales of materials to joint ventures      2.2 1.7
Liabilities due to related parties   1.9 0.9  
Receivables due from related parties   5.0 3.8  
RS Cogen
       
Investments and related party transactions        
Ownership interest (as a percent)   50.00%    
Carrying amount of investment in excess of underlying equity in net deficit   18.1    
RS Cogen | Chlorovinyls
       
Investments and related party transactions        
Ownership interest (as a percent)   50.00%    
Production capacity of combined cycle natural gas-fired cogeneration facility in Lake Charles, Louisiana (in megawatt)   425    
RS Cogen | Not a primary beneficiary | Chlorovinyls
       
Maximum exposure to loss associated with RS Cogen        
Investment in and advances to RS Cogen   10.9    
Supply contracts   40.6    
Maximum exposure to loss   51.5    
Several manufacturing joint ventures | Building Products
       
Investments and related party transactions        
Investment in joint ventures   2.5 3.8  
Ownership interest (as a percent)   50.00%    
Maximum exposure to loss associated with RS Cogen        
Sales of materials to joint ventures   11.6 14.9 11.0
Liabilities due to related parties   0 0  
Receivables due from related parties   1.0 1.6  
Equity in earnings from joint ventures   $ 0.8 $ 0.7 $ 0.6