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SIGNIFICANT ACCOUNTING POLICIES (Details 4)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
SIGNIFICANT ACCOUNTING POLICIES      
Number of reporting units for which qualitative test is used | segment 10    
Impairment of goodwill $ 0.0    
Changes in the carrying amount of goodwill      
Beginning goodwill, net 6,717.0 $ 6,862.9  
Current year business combinations 136.2 33.0  
Prior year business combinations 0.7 16.8  
Dispositions (0.5) (0.6)  
Effect of foreign currency translation (362.6) (195.1)  
Ending goodwill, net 6,490.8 6,717.0 $ 6,862.9
Goodwill expected to be tax deductible 45.9 20.7  
Nalco | Trademarks      
Changes in the carrying amount of goodwill      
Carrying value of asset subject to impairment testing 1,200.0    
Impairment of indefinite life intangible asset 0.0 0.0 0.0
Global Industrial      
Changes in the carrying amount of goodwill      
Beginning goodwill, net 2,642.2 2,729.5  
Current year business combinations 84.2 18.5  
Prior year business combinations 0.7 (0.1)  
Dispositions (0.4)    
Reclassifications 23.7 (28.9)  
Effect of foreign currency translation (142.2) (76.8)  
Ending goodwill, net 2,560.8 2,642.2 2,729.5
Global Institutional      
Changes in the carrying amount of goodwill      
Beginning goodwill, net 691.2 706.6  
Current year business combinations 6.1    
Dispositions   (0.4)  
Reclassifications (2.9) 5.0  
Effect of foreign currency translation (37.5) (20.0)  
Ending goodwill, net 662.7 691.2 706.6
Global Energy      
Changes in the carrying amount of goodwill      
Beginning goodwill, net 3,262.1 3,306.2  
Current year business combinations 45.0 9.9  
Prior year business combinations   16.9  
Dispositions (0.1)    
Reclassifications (20.8) 23.9  
Effect of foreign currency translation (176.3) (94.8)  
Ending goodwill, net 3,151.5 3,262.1 3,306.2
Other      
Changes in the carrying amount of goodwill      
Beginning goodwill, net 121.5 120.6  
Current year business combinations 0.9 4.6  
Dispositions   (0.2)  
Effect of foreign currency translation (6.6) (3.5)  
Ending goodwill, net $ 115.8 $ 121.5 $ 120.6