SIGNIFICANT ACCOUNTING POLICIES - Schedule of Restructuring Initiatives (Details) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($)
Restructuring Reserve [Roll Forward]
Balance at January 1, 2025	$ 0.0
Provisions:	111.0
Payments, currency and other adjustments	(71.3)
Balance at December 31, 2025	39.7
Severance and related costs
Restructuring Reserve [Roll Forward]
Provisions:	84.6
Other qualified costs
Restructuring Reserve [Roll Forward]
Provisions:	26.4
Operating Segments \| Consumer Brands Group
Restructuring Reserve [Roll Forward]
Balance at January 1, 2025	0.0
Provisions:	39.1
Payments, currency and other adjustments	(29.6)
Balance at December 31, 2025	9.5
Operating Segments \| Consumer Brands Group \| Severance and related costs
Restructuring Reserve [Roll Forward]
Provisions:	15.1
Operating Segments \| Consumer Brands Group \| Other qualified costs
Restructuring Reserve [Roll Forward]
Provisions:	24.0
Operating Segments \| Performance Coatings Group
Restructuring Reserve [Roll Forward]
Balance at January 1, 2025	0.0
Provisions:	17.9
Payments, currency and other adjustments	(12.4)
Balance at December 31, 2025	5.5
Operating Segments \| Performance Coatings Group \| Severance and related costs
Restructuring Reserve [Roll Forward]
Provisions:	15.5
Operating Segments \| Performance Coatings Group \| Other qualified costs
Restructuring Reserve [Roll Forward]
Provisions:	2.4
Administrative
Restructuring Reserve [Roll Forward]
Balance at January 1, 2025	0.0
Provisions:	54.0
Payments, currency and other adjustments	(29.3)
Balance at December 31, 2025	24.7
Administrative \| Severance and related costs
Restructuring Reserve [Roll Forward]
Provisions:	54.0
Administrative \| Other qualified costs
Restructuring Reserve [Roll Forward]
Provisions:	$ 0.0

Payments For Restructuring, Foreign Currency Translation And Other Adjustment

No definition available.

Name:	shw_PaymentsForRestructuringForeignCurrencyTranslationAndOtherAdjustment
Namespace Prefix:	shw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-18

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482047/420-10-45-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-21

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-6

+ Details

Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=shw_ConsumerBrandsGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=shw_PerformanceCoatingsGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: