Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesSilgan and its subsidiaries file U.S. Federal income tax returns, as well as income tax returns in various states and foreign jurisdictions. The Internal Revenue Service, or IRS, has completed its review of the 2019 tax year with no change to our filed federal income tax return. We have been accepted into the Compliance Assurance Program for the 2020 and 2021 tax years which provides for the review by the IRS of tax matters relating to our tax return prior to filing.