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SPECIAL (GAINS) AND CHARGES - Restructuring and Non-Restructuring Activity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Apr. 27, 2024
Other restructuring information |  |  |  |  |  |  |  |  |
Resulting in a gain |  |  | $ 12.0 |  |  |  |  |  |
Gain after tax |  |  | $ 9.2 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Global surgical solutions business |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | $ 950.0
Cash received from sale of business | $ 926.0 |  |  |  |  |  |  |  |
Special gain (loss) on sale of business before tax |  |  |  |  |  | $ 365.3 |  |  |
Special gain (loss) on sale of business after tax |  |  |  |  |  | $ 264.2 |  |  |
Gain on sale of business per diluted share |  |  |  |  |  | $ 0.92 |  |  |
Transaction costs and other adjustments |  |  |  |  |  | $ 56.4 |  |  |
Professional services |  |  |  | $ 3.3 | $ 2.4 | 14.6 |  |  |
Services from professionals, net of tax |  |  |  | 2.5 | 1.8 | 11.3 |  |  |
Special (gains) and charges |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Business combination advisory and legal fees, pre tax |  | $ 11.0 |  | 3.5 | 19.8 | 8.3 |  |  |
Business combination and integration related costs, after tax |  | 10.2 |  | 2.7 | 16.9 | 6.3 |  |  |
Other special gains and charges |  | (2.2) |  | 3.1 | (13.2) | (8.8) |  |  |
Specific legal reserve and related legal charges |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Other special gains and charges |  | (2.2) |  | 3.1 | 13.2 | (8.8) |  |  |
Other special gains and charges, after-tax |  | 1.7 |  | 2.3 | 11.4 | 6.9 |  |  |
Prior Year Plans |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Restructuring liability |  | 5.6 |  |  | 5.6 |  | $ 6.5 | $ 6.5 |
Combined Program |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charges incurred, pre-tax |  |  |  |  | 184.1 |  |  |  |
Restructuring charges incurred, after tax |  |  |  |  | 151.5 |  |  |  |
Cash payments |  | 1.2 |  |  | 9.5 |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  |  |  |  | 170.1 |
Net cash payments |  |  |  |  |  |  |  | (156.0) |
Non-cash net charges |  |  |  |  |  |  |  | (15.3) |
Reclassification |  |  |  |  |  |  |  | (14.0) |
Restructuring liability |  | 3.2 |  |  | 3.2 |  | 12.8 | 12.8 |
Combined Program | Special (gains) and charges |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charges incurred, pre-tax |  |  |  | 0.4 | (12.0) | 20.1 |  |  |
Combined Program | Cost of sales |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charges incurred, pre-tax |  |  |  | 0.9 |  | 3.2 |  |  |
Combined Program | Employee termination costs |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  |  |  |  | 118.0 |
Net cash payments |  |  |  |  |  |  |  | (124.5) |
Reclassification |  |  |  |  |  |  |  | (19.3) |
Restructuring liability |  |  |  |  |  |  | 12.8 | 12.8 |
Combined Program | Asset disposals |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  |  |  |  | 15.3 |
Non-cash net charges |  |  |  |  |  |  |  | (15.3) |
Combined Program | Other |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  |  |  |  | 36.8 |
Net cash payments |  |  |  |  |  |  |  | (31.5) |
Reclassification |  |  |  |  |  |  |  | 5.3 |
One Ecolab |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charge expected to be incurred, pre-tax |  | 240.0 |  |  | 240.0 |  |  |  |
Restructuring charge expected to be incurred, after tax |  | 187.0 |  |  | 187.0 |  |  |  |
Restructuring and related special charges, pre-tax |  | 60.0 |  |  | 60.0 |  |  |  |
Restructuring and related activities special charges, after tax |  | 47.0 |  |  | 47.0 |  |  |  |
Restructuring charges incurred to date, pre-tax |  | 148.1 |  |  | 148.1 |  |  |  |
Restructuring charges incurred to date, after-tax |  | 114.0 |  |  | 114.0 |  |  |  |
Special charges to date |  | 48.3 |  |  | 48.3 |  |  |  |
Special charges to date, after tax |  | 36.5 |  |  | 36.5 |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  | 66.3 |  | 76.5 |  |
Net cash payments |  |  |  |  | (56.4) |  | (26.9) |  |
Reclassification |  |  |  |  |  |  | 5.3 |  |
Restructuring liability |  | 64.8 |  |  | 64.8 |  | 54.9 | 54.9 |
One Ecolab | Special (gains) and charges |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charges incurred, pre-tax |  | 17.4 |  | 24.4 | 83.3 | 38.9 |  |  |
Professional services |  | 8.2 |  | 7.0 | 24.6 | 16.2 |  |  |
Services from professionals, net of tax |  | 6.2 |  | 5.2 | 18.6 | 12.2 |  |  |
One Ecolab | Cost of sales |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charges incurred, pre-tax |  | 0.3 |  |  | 7.6 |  |  |  |
One Ecolab | Employee termination costs |  |  |  |  |  |  |  |  |
Other restructuring information |  |  |  |  |  |  |  |  |
Restructuring charges incurred, pre-tax |  | 9.5 |  | 17.4 | 66.3 | 22.7 |  |  |
Restructuring charges incurred, after tax |  | 7.3 |  | $ 13.3 | 51.0 | $ 17.3 |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  | 55.5 |  | 46.3 |  |
Net cash payments |  |  |  |  | (38.2) |  |  |  |
Restructuring liability |  | 63.6 |  |  | 63.6 |  | 46.3 | 46.3 |
One Ecolab | Other |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |
Recorded expense (income) and accrual |  |  |  |  | 10.8 |  | 30.2 |  |
Net cash payments |  |  |  |  | (18.2) |  | (26.9) |  |
Reclassification |  |  |  |  |  |  | 5.3 |  |
Restructuring liability |  | $ 1.2 |  |  | $ 1.2 |  | $ 8.6 | $ 8.6 |

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