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SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Changes in the carrying amount of goodwill      
Beginning goodwill $ 6,383.0 $ 6,490.8  
Current year business combinations 599.1 3.7  
Prior year business combinations 0.1 3.6  
Dispositions (42.6)    
Effect of foreign currency translation 227.5 (115.1)  
Ending goodwill 7,167.1 6,383.0  
Goodwill expected to be tax deductible 79.2 3.0  
Previously Reported      
Changes in the carrying amount of goodwill      
Beginning goodwill   6,490.8  
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    
Global Industrial      
Changes in the carrying amount of goodwill      
Beginning goodwill 2,585.0 2,623.5  
Current year business combinations 123.4    
Prior year business combinations (0.2) 3.5  
Reclassifications   3.5  
Effect of foreign currency translation 88.8 (45.5)  
Ending goodwill 2,797.0 2,585.0  
Global Industrial | Previously Reported      
Changes in the carrying amount of goodwill      
Beginning goodwill   2,560.8  
Global Industrial | Adjustment      
Changes in the carrying amount of goodwill      
Beginning goodwill   62.7  
Global Institutional      
Changes in the carrying amount of goodwill      
Beginning goodwill 590.7 600.0  
Current year business combinations 403.7 3.1  
Reclassifications   (0.6)  
Effect of foreign currency translation 32.6 (11.8)  
Ending goodwill 1,027.0 590.7  
Global Institutional | Previously Reported      
Changes in the carrying amount of goodwill      
Beginning goodwill   662.7  
Global Institutional | Adjustment      
Changes in the carrying amount of goodwill      
Beginning goodwill   (62.7)  
Global Energy      
Changes in the carrying amount of goodwill      
Beginning goodwill 3,093.6 3,151.5  
Current year business combinations 8.1 0.6  
Prior year business combinations 0.3 0.1  
Reclassifications   (2.9)  
Effect of foreign currency translation 101.7 (55.7)  
Ending goodwill 3,203.7 3,093.6  
Global Energy | Previously Reported      
Changes in the carrying amount of goodwill      
Beginning goodwill   3,151.5  
Other      
Changes in the carrying amount of goodwill      
Beginning goodwill 113.7 115.8  
Current year business combinations 63.9    
Dispositions (42.6)    
Effect of foreign currency translation 4.4 (2.1)  
Ending goodwill $ 139.4 113.7  
Other | Previously Reported      
Changes in the carrying amount of goodwill      
Beginning goodwill   $ 115.8