Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2025	Feb. 01, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-41459
Entity Registrant Name	SILGAN HOLDINGS INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-1269834
Entity Address, Address Line One	601 Merritt 7
Entity Address, City or Town	Norwalk,
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06851
City Area Code	203
Local Phone Number	975-7110
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SLGN
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 5.7
Entity Common Stock, Shares Outstanding		105,441,971
Documents Incorporated by Reference	Portions of the Registrant’s Proxy Statement, to be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, for its Annual Meeting of Stockholders to be held in 2026 are incorporated by reference in Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Entity Central Index Key	0000849869