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OTHER LONG-TERM LIABILITIES - Schedule of Real Estate Financing (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
--- | --- | --- | ---
Other Liabilities Disclosure [Abstract] |  |  |
Short-term liability | $ 51.2 | $ 51.0 | $ 50.3
Long-term liability | 763.5 | 762.0 | 757.8
Total liability | $ 814.7 | $ 813.0 | $ 808.1

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- Definition Real Estate Financing Liability + References No definition available. + Details
Name: | shw_RealEstateFinancingLiability
Namespace Prefix: | shw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Real Estate Financing Liability, Current + References No definition available. + Details
Name: | shw_RealEstateFinancingLiabilityCurrent
Namespace Prefix: | shw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Real Estate Financing Liability, Noncurrent + References No definition available. + Details
Name: | shw_RealEstateFinancingLiabilityNoncurrent
Namespace Prefix: | shw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration