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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period   $ 404.9
Accumulated impairment losses at the beginning of the period   (187.7)
Net goodwill at the beginning of the period   217.2
Preliminary addition from the Transactions 1,450.2  
Foreign currency translation adjustment (9.5)  
Gross goodwill at the end of the period 1,845.6 404.9
Accumulated impairment losses at the end of the period (187.7) (187.7)
Net goodwill at the end of the period 1,657.9 217.2
Chlorovinyls
   
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period   245.4
Accumulated impairment losses at the beginning of the period   (55.5)
Net goodwill at the beginning of the period   189.9
Preliminary addition from the Transactions 1,450.2  
Foreign currency translation adjustment (9.5)  
Gross goodwill at the end of the period 1,686.1 245.4
Accumulated impairment losses at the end of the period (55.5) (55.5)
Net goodwill at the end of the period 1,630.6 189.9
Building Products
   
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period   159.5
Accumulated impairment losses at the beginning of the period   (132.2)
Net goodwill at the beginning of the period   27.3
Gross goodwill at the end of the period 159.5 159.5
Accumulated impairment losses at the end of the period (132.2) (132.2)
Net goodwill at the end of the period $ 27.3 $ 27.3