SEGMENT INFORMATION - Schedule of Reportable Segments (Details) $ in Thousands	3 Months Ended
Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Financial information regarding the Company's reportable segments
Net Sales	$ 887,305	$ 915,448
Selling, Research & Development and Administrative:	155,277	152,780
Restructuring Initiatives	(2,042)	(3,480)
Net unrealized investment (loss) gain	(1,096)	592
Depreciation and amortization	(65,647)	(64,349)
Interest Expense	(11,351)	(10,175)
Interest Income	2,814	2,898
Income before Income Taxes	106,015	104,318
Optimization initiative
Financial information regarding the Company's reportable segments
Restructuring Initiatives	(2,042)	(3,497)
Prior year initiatives
Financial information regarding the Company's reportable segments
Restructuring Initiatives	0	17
Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	409,467	407,293
Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	305,707	327,320
Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	172,131	180,835
Operating segment
Financial information regarding the Company's reportable segments
Net Sales	895,919	925,067
Adjusted EBITDA	206,848	200,473
Depreciation and amortization	(64,785)	(63,561)
Operating segment \| Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	409,697	407,490
Cost of Sales (exclusive of depreciation and amortization):	205,137	213,747
Selling, Research & Development and Administrative:	62,483	61,593
Other Segment Items:	(603)	(225)
Adjusted EBITDA	142,450	132,178
Restructuring Initiatives	(190)	(24)
Depreciation and amortization	(31,148)	(28,802)
Operating segment \| Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	312,301	334,880
Cost of Sales (exclusive of depreciation and amortization):	224,048	237,972
Selling, Research & Development and Administrative:	46,412	48,628
Other Segment Items:	(1,891)	(414)
Adjusted EBITDA	37,138	41,134
Restructuring Initiatives	(395)	(2,710)
Depreciation and amortization	(20,062)	(21,228)
Operating segment \| Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	173,921	182,697
Cost of Sales (exclusive of depreciation and amortization):	122,391	131,336
Selling, Research & Development and Administrative:	23,012	22,665
Other Segment Items:	(532)	(327)
Adjusted EBITDA	27,260	27,161
Restructuring Initiatives	(1,352)	(760)
Depreciation and amortization	(13,575)	(13,531)
Intersegment
Financial information regarding the Company's reportable segments
Net Sales	(8,614)	(9,619)
Intersegment \| Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	(230)	(197)
Intersegment \| Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	(6,594)	(7,560)
Intersegment \| Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	(1,790)	(1,862)
Corporate & Other
Financial information regarding the Company's reportable segments
Adjusted EBITDA	(23,511)	(21,641)
Restructuring Initiatives	(105)	14
Depreciation and amortization	$ (862)	$ (788)

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