SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of AptarGroup, Inc. and our subsidiaries. The terms “AptarGroup,” “Aptar,” “Company,” “we,” “us” or “our” as used herein refer to AptarGroup, Inc. and our subsidiaries. All significant intercompany accounts and transactions have been eliminated. Certain previously reported amounts have been reclassified to conform to the current period presentation. In the opinion of management, the unaudited Condensed Consolidated Financial Statements (the “Condensed Consolidated Financial Statements”) include all normal recurring adjustments necessary for a fair statement of consolidated financial position, results of operations, comprehensive income, changes in equity and cash flows for the interim periods presented. The accompanying Condensed Consolidated Financial Statements have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading. Also, certain financial position data included herein was derived from the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2023 but does not include all disclosures required by U.S. GAAP. Accordingly, these Condensed Consolidated Financial Statements and related notes should be read in conjunction with the audited Consolidated Financial Statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations of any interim period are not necessarily indicative of the results that may be expected for the year.
ADOPTION OF RECENT ACCOUNTING STANDARDS	ADOPTION OF RECENT ACCOUNTING STANDARDS Changes to U.S. GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of Accounting Standards Updates (“ASUs”) to the FASB’s Accounting Standards Codification. In March 2020, the FASB issued ASU 2020-04, which provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments to this update apply only to contracts, hedging relationships and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. ASU 2020-04 was further amended in January 2021 by ASU 2021-01 which clarified the applicability of certain provisions. Both standards are effective upon issuance and could be adopted any time prior to December 31, 2022. The guidance in ASU 2020-04 and ASU 2021-01 is optional and may be elected over time as reference rate reform activities occur. We adopted this guidance in the second quarter of 2023 and have transitioned away from the London Interbank Offered Rate ("LIBOR") to the Secured Overnight Financing Rate ("SOFR") in our revolving credit facility. In November 2023, the FASB issued ASU 2023-07, Improvement to Reportable Segment Disclosures, which requires enhanced disclosures about significant segment expenses on an annual and interim basis. The amendments in ASU 2023-07 are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted, and are to be applied on a retrospective basis. We are evaluating the impact of the standard on our segment reporting disclosures. In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures, which is intended to improve income tax disclosure requirements by requiring (i) consistent categories and greater disaggregation of information in the rate reconciliation and (ii) the disaggregation of income taxes paid by jurisdiction. The guidance makes several other changes to income tax disclosure requirements. The amendments is ASU 2023-09 are effective for fiscal years beginning after December 15, 2024, with early adoption permitted, and is required to be applied prospectively with the option of retrospective application. We are evaluating the impact of the standard on our income tax disclosures. Other accounting standards that have been issued by the FASB or other standards-setting bodies did not have a material impact on our Condensed Consolidated Financial Statements.
INCOME TAXES	INCOME TAXES We compute taxes on income in accordance with the tax rules and regulations of the many taxing authorities where income is earned. The income tax rates imposed by these taxing authorities may vary substantially. Taxable income may differ from pre-tax income for U.S. GAAP financial accounting purposes. To the extent that these differences create temporary differences between the tax basis of an asset or liability and our reported amount in the U.S. GAAP financial statements, an appropriate provision for deferred income taxes is made. We maintain our assertion that the cash and distributable reserves at our non-U.S. affiliates are indefinitely reinvested with the following exceptions: all earnings in Germany and the pre-2020 earnings in Italy, Switzerland and Colombia. As of March 31, 2024, under currently enacted laws, we do not have a balance of foreign earnings that will be subject to U.S. taxation upon repatriation. We will provide for the necessary withholding and local income taxes when management decides that an affiliate should make a distribution. These decisions are made taking into consideration the financial requirements of the non-U.S. affiliates and our global cash management goals. See Note 5 - Income Taxes for more information. We provide a liability for the amount of unrecognized tax benefits from uncertain tax positions. This liability is provided whenever we determine that a tax benefit will not meet a more-likely-than-not threshold for recognition. We are subject to the examination of our returns and other tax matters by the U.S. Internal Revenue Service and other tax authorities and government bodies. We believe that we have adequately provided a tax reserve for any adjustments that may result from tax examinations or uncertain tax positions. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in our tax audits are resolved in a manner inconsistent with our expectations, we could be required to adjust our provision for income taxes in the period such resolution occurs. The resolution of each of these audits is not expected to be material to our Condensed Consolidated Financial Statements.
ASSETS HELD FOR SALE	ASSETS HELD FOR SALE Assets to be disposed of by sale are reported at the lower of their carrying amount or fair value less costs to sell, and are not depreciated while they are held for sale. During the second quarter of 2023, we recorded $0.7 million as assets held for sale within prepaid and other on our Condensed Consolidated Balance Sheets related to three buildings located in France. During the third quarter of 2023, two of the three buildings were sold and we recognized a $0.8 million gain on sale.
SUPPLY CHAIN FINANCE PROGRAM	SUPPLY CHAIN FINANCE PROGRAM We facilitate a supply chain finance program ("SCF") across Europe and the U.S. that is administered by a third-party platform. Eligible suppliers can elect to receive early payment of invoices, less an interest deduction, and negotiate their receivable sales arrangements through the third-party platform on behalf of the respective SCF bank. We are not a party to those agreements, and the terms of our payment obligations are not impacted by a supplier's participation in the SCF. Accordingly, we have concluded that this program continues to be a trade payable program and is not indicative of a borrowing arrangement. Under these agreements, the average payment terms range from 60 to 120 days and are based on industry standards and best practices within each of our regions. All outstanding amounts related to suppliers participating in the SCF are recorded within accounts payable, accrued and other liabilities in our Condensed Consolidated Balance Sheets, and associated payments are included in operating activities within our Condensed Consolidated Statements of Cash Flows. As of March 31, 2024, the amounts due to suppliers participating in the SCF and included in accounts payable, accrued and other liabilities were approximately $41.2 million. Collection and payment periods tend to be longer for our operations located outside the United States due to local business practices. We have also seen an increasing trend in pressure from certain customers to lengthen their payment terms. As the majority of our products are made to order, we have not needed to keep significant amounts of finished goods inventory to meet customer requirements. However, some of our contracts specify an amount of finished goods safety stock we are required to maintain. To the extent our financial position allows and there is a clear financial benefit, we from time-to-time benefit from early payment discounts with some suppliers. We have lengthened the payment terms with our suppliers to be in line with customer trends. While we have offered a third party alternative for our suppliers to receive payments sooner, we generally do not utilize these offerings from our customers as the economic conditions currently are not beneficial for us.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.