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RETIREMENT PLANS - Savings Plan and ESOP (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of matching contribution by company vested immediately | 100.00% |  |
Employer matching contribution expense | $ 88.2 | $ 81.6 | $ 78.2
Ecolab Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of matching contribution made by company, up to 4% eligible compensation | 100.00% |  |
Percentage of matching contribution made by company for employee contributions between 4% and 8% | 50.00% |  |
Minimum | Ecolab Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of eligible compensation, matched 50% | 4.00% |  |
Maximum | Ecolab Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of eligible compensation, matched 100% | 4.00% |  |
Percentage of eligible compensation, matched 50% | 8.00% |  |

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