SEGMENT INFORMATION - Schedule of Reportable Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Financial information regarding the Company's reportable segments
Net Sales	$ 909,291	$ 892,997	$ 2,734,802	$ 2,648,970
Acquisition-related costs	0	0	(140)	(255)
Restructuring Initiatives	(3,864)	(6,161)	(9,659)	(19,628)
Curtailment gain related to restructuring initiatives	1,851	0	1,851	0
Net unrealized investment (loss) gain	1,043	(5,428)	1,495	(2,349)
Depreciation and amortization	(67,015)	(62,686)	(196,332)	(184,212)
Interest Expense	(12,290)	(9,984)	(32,526)	(29,900)
Interest Income	3,022	946	9,022	2,266
Income before Income Taxes	131,131	110,049	353,695	294,196
Optimization initiative
Financial information regarding the Company's reportable segments
Restructuring Initiatives	(3,864)	(6,586)	(9,676)	(20,069)
Prior year initiatives
Financial information regarding the Company's reportable segments
Restructuring Initiatives	0	425	17	441
Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	420,594	389,188	1,242,420	1,135,934
Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	302,859	323,980	951,666	979,956
Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	185,838	179,829	540,716	533,080
Operating segment
Financial information regarding the Company's reportable segments
Net Sales	917,032	901,452	2,762,563	2,678,225
Operating segment | Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	420,753	389,423	1,243,026	1,136,544
Adjusted EBITDA	151,594	136,344	425,260	371,508
Restructuring Initiatives	(564)	(92)	(653)	(1,657)
Operating segment | Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	308,955	330,467	972,535	1,002,209
Adjusted EBITDA	40,221	41,070	125,993	121,375
Restructuring Initiatives	(1,962)	(2,880)	(5,871)	(12,650)
Operating segment | Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	187,324	181,562	547,002	539,472
Adjusted EBITDA	31,980	27,607	86,259	81,387
Restructuring Initiatives	(877)	(3,098)	(2,530)	(4,060)
Intersegment
Financial information regarding the Company's reportable segments
Net Sales	7,741	8,455	27,761	29,255
Intersegment | Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	159	235	606	610
Intersegment | Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	6,096	6,487	20,869	22,253
Intersegment | Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	1,486	1,733	6,286	6,392
Corporate & Other, unallocated
Financial information regarding the Company's reportable segments
Adjusted EBITDA	(15,411)	(11,659)	(57,528)	(45,996)
Restructuring Initiatives	$ (461)	$ (91)	$ (605)	$ (1,261)