SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - ECOLAB PUERTO RICO SAVINGS PLAN - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Entity tax identification number	41-0231510
Plan number	005
Notes receivable from participants	$ 392	$ 437
Total assets	$ 14,861
Minimum
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Interest rates of notes receivable from participants (in%)	4.25%
Maximum
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Interest rates of notes receivable from participants (in%)	9.50%
Investment, Identifier [Axis]: Harbor Capital Appreciate CIT Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:HarborCapitalAppreciateCitMember
Investment current value type	Common/collective trusts
Current Value	$ 77
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Money Market Dodge amp; Cox Stock Fund Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:DodgeCoxStockFundMember
Investment current value type	Registered investment companies
Current Value	$ 321
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Money Market Fidelity Global ex US Index Fund Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:FidelityGlobalExUsIndexFundMember
Investment current value type	Registered investment companies
Current Value	$ 5
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund American Europacific Growth R6 Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:AmericanEuropacificGrowthR6Member
Investment current value type	Registered investment companies
Current Value	$ 180
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund Banco Popular Time Deposit Open Account Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:BancoPopularTimeDepositOpenAccountMember
Investment current value type	Registered investment companies
Current Value	$ 2
Asset held for investment, party-in-interest	true
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund Fidelity Extended Market Index Fund Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:FidelityExtendedMarketIndexFundMember
Investment current value type	Registered investment companies
Current Value	$ 283
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund Fidelity Government Money Market Fund Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:FidelityGovernmentMoneyMarketFundMember
Investment current value type	Registered investment companies
Current Value	$ 175
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund Spartan 500 Index Fund Investor Class Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:Spartan500IndexFundInvestorClassMember
Investment current value type	Registered investment companies
Current Value	$ 3,129
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund Spartan US Bond Index Fund Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:SpartanUsBondIndexFundMember
Investment current value type	Registered investment companies
Current Value	$ 278
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Fund Western Asset Core Plus Bond Fund Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:WesternAssetCorePlusBondFundMember
Investment current value type	Registered investment companies
Current Value	$ 6
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2025 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2025FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 427
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2030 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2030FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 919
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2035 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2035FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 1,146
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2040 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2040FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 1,096
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2045 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2045FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 908
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2050 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2050FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 476
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2055 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2055FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 251
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2060 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2060FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 70
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement 2065 Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirement2065FundMMember
Investment current value type	Common/collective trusts
Current Value	$ 54
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: State Street Target Retirement Income Fund M Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:StateStreetTargetRetirementIncomeFundMMember
Investment current value type	Common/collective trusts
Current Value	$ 25
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Wellington Trust Investment Fund Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Investment issuer name	ecl:WellingtonTrustInvestmentFundMember
Investment current value type	Common/collective trusts
Current Value	$ 61
Participation status	us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Registered investment companies
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Current Value	$ 4,379
Common/collective trusts
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Current Value	5,510
Ecolab Inc. common stock
SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
Current Value	$ 4,580
Asset held for investment, party-in-interest	true

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Amount of total assets in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, current value of investment, participant loan, and plan interest in master trust.

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Amount of unpaid principal plus accrued but unpaid interest for loan from participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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