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SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Changes in the carrying amount of goodwill for each of the company's reportable segments        
Number of reporting units | item 11      
Changes in the carrying amount of goodwill        
Beginning goodwill $ 5,394.1 $ 5,466.6    
Current year business combinations 235.0 84.0    
Prior year business combinations (0.2) (2.1)    
Reclassifications   (0.5)    
Effect of foreign currency translation (59.8) (153.9)    
Ending goodwill 5,569.1 5,394.1 $ 5,466.6  
Impairment of goodwill 0.0 0.0 0.0  
Goodwill expected to be tax deductible 49.4      
Allocation        
Changes in the carrying amount of goodwill        
Beginning goodwill   5,466.6    
Ending goodwill     5,466.6  
Nalco Holding Company ("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 3,961.6 4,003.3    
Current year business combinations   68.4    
Prior year business combinations (0.2) (1.2)    
Reclassifications     1,278.0  
Effect of foreign currency translation (37.7) (108.9)    
Ending goodwill 3,923.7 3,961.6 4,003.3  
Global Industrial | Allocation        
Changes in the carrying amount of goodwill        
Beginning goodwill   2,725.3    
Ending goodwill     2,725.3  
Global Institutional & Specialty        
Changes in the carrying amount of goodwill        
Beginning goodwill 417.8 414.3    
Current year business combinations 135.3 12.4    
Reclassifications     (612.7)  
Effect of foreign currency translation (4.9) (8.9)    
Ending goodwill 548.2 417.8 414.3  
Global Institutional & Specialty | Allocation        
Changes in the carrying amount of goodwill        
Beginning goodwill   1,027.0    
Ending goodwill     1,027.0  
Global Healthcare and Life Sciences        
Changes in the carrying amount of goodwill        
Beginning goodwill 775.3 803.1    
Current year business combinations 99.0 3.2    
Reclassifications   (0.5) 803.1  
Effect of foreign currency translation (14.9) (30.5)    
Ending goodwill 859.4 775.3 803.1  
Global Energy        
Changes in the carrying amount of goodwill        
Reclassifications     (1,503.2)  
Global Energy | Allocation        
Changes in the carrying amount of goodwill        
Beginning goodwill   1,503.2    
Ending goodwill     1,503.2  
Other        
Changes in the carrying amount of goodwill        
Beginning goodwill 239.4 245.9    
Current year business combinations 0.7      
Prior year business combinations   (0.9)    
Reclassifications     34.8  
Effect of foreign currency translation (2.3) (5.6)    
Ending goodwill $ 237.8 239.4 245.9  
Other | Allocation        
Changes in the carrying amount of goodwill        
Beginning goodwill   $ 211.1    
Ending goodwill     $ 211.1