v3.26.1
SPECIAL (GAINS) AND CHARGES - Reported on Statement of Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2024
Special (gains) and charges          
One Ecolab/Other restructuring         $ 184.1
Special (gains) and charges subtotal $ 46.4 $ 24.6 $ 92.8 $ 54.1  
Interest expense, net 6.6   6.6    
Total special (gains) and charges 57.7 27.1 115.4 61.4  
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold          
Special (gains) and charges          
One Ecolab/Other restructuring 4.7 2.5 16.0 7.3  
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold | One Ecolab          
Special (gains) and charges          
One Ecolab/Other restructuring 1.1 2.5 2.7 7.3  
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold | Other Restructuring Plan          
Special (gains) and charges          
One Ecolab/Other restructuring 3.6 0.0 13.3 0.0  
Location, Statement of Income, Balance [Axis]: us-gaap:NonoperatingIncomeExpense          
Special (gains) and charges          
Other 13.6 2.0 14.5 11.0  
Location, Statement of Income, Balance [Axis]: us-gaap:OtherNonrecurringIncomeExpense          
Special (gains) and charges          
Acquisition and integration activities 4.6 7.3 18.7 8.8  
Sale of global surgical solutions business 0.0 0.8 0.0 2.4  
Other 13.6 2.0 14.5 (11.0)  
Location, Statement of Income, Balance [Axis]: us-gaap:OtherNonrecurringIncomeExpense | One Ecolab          
Special (gains) and charges          
One Ecolab/Other restructuring 27.7 26.5 59.1 65.9  
Location, Statement of Income, Balance [Axis]: us-gaap:OtherNonrecurringIncomeExpense | Other Restructuring Plan          
Special (gains) and charges          
One Ecolab/Other restructuring 0.5 (12.0) 0.5 (12.0)  
Location, Statement of Income, Balance [Axis]: ecl:InterestExpenseNet          
Special (gains) and charges          
Interest expense, net $ 6.6 $ 0.0 $ 6.6 $ 0.0