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GOODWILL, OTHER INTANGIBLE ASSETS AND RESTRUCTURING (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
segment
Dec. 31, 2013
GOODWILL, OTHER INTANGIBLE ASSETS AND RESTRUCTURING    
Number of segments that contain reporting units with goodwill and intangible assets 2  
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period $ 1,969.1  
Adjustments 0.7  
Foreign currency translation adjustment (9.1)  
Gross goodwill at the end of the period 1,960.7  
Accumulated impairment losses at the end of the period (205.9) (205.9)
Net goodwill at the end of the period 1,754.8 1,763.2
Chlorovinyls
    
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period 1,808.8  
Adjustments 0.7  
Foreign currency translation adjustment (9.1)  
Gross goodwill at the end of the period 1,800.4  
Accumulated impairment losses at the end of the period (55.5) (55.5)
Net goodwill at the end of the period 1,744.9 1,753.3
Building Products
    
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period   160.3
Gross goodwill at the end of the period 160.3 160.3
Accumulated impairment losses at the end of the period (150.4) (150.4)
Net goodwill at the end of the period 9.9 9.9
Merged Business | Immaterial correction of an error | Overstatement of certain assets and deferred tax liabilities
    
Goodwill    
Net assets acquired (0.7)  
Changes made to goodwill by reportable segment    
Net goodwill at the end of the period $ 0.7