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GOODWILL AND OTHER INTANGIBLE ASSETS (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
GOODWILL AND OTHER INTANGIBLE ASSETS    
Number of segments that contain reporting units with goodwill and intangible assets | segment 2  
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period $ 1,951.0  
Foreign currency translation adjustment (5.8)  
Gross goodwill at the end of the period 1,945.2  
Accumulated impairment losses at the end of the period (210.0) $ (210.0)
Net goodwill at the end of the period 1,735.2 1,741.0
Trade names    
Changes made to goodwill by reportable segment    
Indefinite-lived intangible assets, net of cumulative translation adjustment 5.9 6.0
Chlorovinyls    
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period 1,790.8  
Foreign currency translation adjustment (5.8)  
Gross goodwill at the end of the period 1,785.0  
Accumulated impairment losses at the end of the period (59.6) (59.6)
Net goodwill at the end of the period 1,725.4 1,731.2
Building Products    
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period 160.2  
Gross goodwill at the end of the period 160.2  
Accumulated impairment losses at the end of the period (150.4) (150.4)
Net goodwill at the end of the period $ 9.8 $ 9.8