SEGMENT INFORMATION - Summary of Reportable Segments (Details) $ in Thousands		12 Months Ended
	Jan. 01, 2023 segment	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment
Segment Reporting [Abstract]
Number of reportable segments | segment		3	3	3
Number of realigned segments | segment	2
Financial information regarding the Company's reportable segments
Net Sales		$ 3,487,450	$ 3,322,249	$ 3,227,221
Acquisition-related costs		(480)	(231)	(3,811)
Restructuring initiatives		(45,004)	(6,597)	(23,240)
Net unrealized investment (loss) gain		(2,775)	(3,323)	2,709
Depreciation and amortization		(248,593)	(233,706)	(234,853)
Interest expense		(40,418)	(40,827)	(30,284)
Interest income		4,373	2,700	3,668
Income before Income Taxes		374,825	334,704	321,655
Capital Expenditures		312,342	310,427	307,935
Total Assets		4,451,890	4,203,458	4,141,364
Optimization Initiative
Financial information regarding the Company's reportable segments
Restructuring initiatives		(45,445)	(6,224)	0
Prior Year Initiatives
Financial information regarding the Company's reportable segments
Restructuring initiatives		441	(373)	(23,240)
Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales		1,520,993	1,361,256	1,284,624
Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales		1,267,697	1,222,535	1,181,846
Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales		698,760	738,458	760,751
Operating Segments
Financial information regarding the Company's reportable segments
Net Sales		3,526,161	3,366,522	3,270,805
Operating Segments | Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales		1,521,837	1,372,449	1,297,996
Adjusted EBITDA		502,633	441,622	425,714
Restructuring initiatives		(4,852)	0	(76)
Depreciation and amortization		(109,366)	(94,396)	(90,510)
Capital Expenditures		196,083	164,396	154,077
Total Assets		2,111,779	1,872,843	1,833,512
Operating Segments | Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales		1,297,477	1,246,018	1,204,312
Adjusted EBITDA		163,716	151,887	125,451
Restructuring initiatives		(20,683)	(5,539)	(8,149)
Depreciation and amortization		(83,399)	(80,498)	(83,379)
Capital Expenditures		83,872	74,203	87,442
Total Assets		1,412,203	1,398,813	1,370,854
Operating Segments | Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales		706,847	748,055	768,497
Adjusted EBITDA		103,693	86,109	108,615
Restructuring initiatives		(17,927)	(1,058)	(2,702)
Depreciation and amortization		(52,095)	(52,866)	(53,555)
Capital Expenditures		52,160	44,223	47,225
Total Assets		765,930	779,654	819,332
Intersegment
Financial information regarding the Company's reportable segments
Net Sales		38,711	44,273	43,584
Intersegment | Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales		844	11,193	13,372
Intersegment | Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales		29,780	23,483	22,466
Intersegment | Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales		8,087	9,597	7,746
Corporate & Other
Financial information regarding the Company's reportable segments
Adjusted EBITDA		(62,320)	(62,930)	(52,314)
Restructuring initiatives		(1,542)	0	(12,313)
Depreciation and amortization		(3,733)	(5,946)	(7,409)
Capital Expenditures		14,729	29,491	29,686
Transfer of Corporate Expenditures		(34,502)	(1,886)	(10,495)
Total Assets		$ 161,978	$ 152,148	$ 117,666