SEGMENT INFORMATION - Schedule of Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Financial information regarding the Company's reportable segments
Net Sales	$ 966,009	$ 910,063	$ 1,853,314	$ 1,825,511
Cost of Sales (exclusive of depreciation and amortization):	598,994	567,440	1,149,885	1,150,196
Selling, Research & Development and Administrative:	151,139	149,330	306,416	302,110
Acquisition related costs	(344)	(140)	(344)	(140)
Restructuring Initiatives	(1,579)	(2,315)	(3,621)	(5,795)
Net unrealized investment gain (loss)	2,102	(140)	1,006	452
Depreciation and amortization	(69,904)	(64,968)	(135,551)	(129,317)
Interest Expense	(10,850)	(10,061)	(22,201)	(20,236)
Interest Income	1,880	3,102	4,694	6,000
Income before Income Taxes	139,714	118,246	245,729	222,564
Optimization initiative
Financial information regarding the Company's reportable segments
Restructuring Initiatives	(1,579)	(2,315)	(3,621)	(5,812)
Prior year initiatives
Financial information regarding the Company's reportable segments
Restructuring Initiatives	0	0	0	17
Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	442,589	414,533	852,056	821,826
Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	334,849	321,487	640,556	648,807
Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	188,571	174,043	360,702	354,878
Operating segment
Financial information regarding the Company's reportable segments
Net Sales	975,346	920,464	1,871,265	1,845,531
Adjusted EBITDA	235,787	213,244	442,635	413,717
Depreciation and amortization	(69,091)	(64,389)	(133,876)	(127,950)
Operating segment | Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	442,817	414,783	852,514	822,273
Cost of Sales (exclusive of depreciation and amortization):	224,879	213,795	430,016	427,542
Selling, Research & Development and Administrative:	60,703	59,511	123,186	121,104
Other Segment Items:	176	(261)	(427)	(486)
Adjusted EBITDA	156,831	141,488	299,281	273,666
Restructuring Initiatives	(68)	(65)	(258)	(89)
Depreciation and amortization	(34,169)	(29,609)	(65,317)	(58,411)
Operating segment | Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	342,251	328,700	654,552	663,580
Cost of Sales (exclusive of depreciation and amortization):	241,378	229,553	465,426	467,525
Selling, Research & Development and Administrative:	48,738	48,278	95,150	96,906
Other Segment Items:	(2,340)	(982)	(4,231)	(1,396)
Adjusted EBITDA	47,073	44,638	84,211	85,772
Restructuring Initiatives	(626)	(1,199)	(1,021)	(3,909)
Depreciation and amortization	(21,475)	(20,526)	(41,537)	(41,754)
Operating segment | Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	190,278	176,981	364,199	359,678
Cost of Sales (exclusive of depreciation and amortization):	133,362	125,087	255,753	256,423
Selling, Research & Development and Administrative:	23,858	22,397	46,870	45,062
Other Segment Items:	(532)	(559)	(1,064)	(886)
Adjusted EBITDA	31,883	27,118	59,143	54,279
Restructuring Initiatives	(890)	(893)	(2,242)	(1,653)
Depreciation and amortization	(13,447)	(14,254)	(27,022)	(27,785)
Intersegment
Financial information regarding the Company's reportable segments
Net Sales	(9,337)	(10,401)	(17,951)	(20,020)
Intersegment | Aptar Pharma
Financial information regarding the Company's reportable segments
Net Sales	(228)	(250)	(458)	(447)
Intersegment | Aptar Beauty
Financial information regarding the Company's reportable segments
Net Sales	(7,402)	(7,213)	(13,996)	(14,773)
Intersegment | Aptar Closures
Financial information regarding the Company's reportable segments
Net Sales	(1,707)	(2,938)	(3,497)	(4,800)
Corporate & Other
Financial information regarding the Company's reportable segments
Adjusted EBITDA	(17,378)	(20,476)	(40,889)	(42,117)
Restructuring Initiatives	5	(158)	(100)	(144)
Depreciation and amortization	$ (813)	$ (579)	$ (1,675)	$ (1,367)