CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net Sales	$ 776,754	$ 721,553
Operating Expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	488,705	451,256
Selling, research & development and administrative	134,348	126,192
Depreciation and amortization	57,438	50,806
Restructuring initiatives	3,672	4,839
​Total Operating Expenses	684,163	633,093
Operating Income	92,591	88,460
Other Income (Expense):
Interest expense	(7,415)	(8,388)
Interest income	381	175
Net investment gain	16,809	0
Equity in results of affiliates	(515)	(799)
Miscellaneous, net	(963)	(1,412)
​Total Other Income (Expense)	8,297	(10,424)
Income before Income Taxes	100,888	78,036
Provision for Income Taxes	16,949	22,786
Net Income	83,939	55,250
Net Loss Attributable to Noncontrolling Interests	13	3
Net Income Attributable to AptarGroup, Inc.	$ 83,952	$ 55,253
Net Income Attributable to AptarGroup, Inc. per Common Share:
Basic (in dollars per share)	$ 1.29	$ 0.86
Diluted (in dollars per share)	$ 1.24	$ 0.84
Average Number of Shares Outstanding:
Basic (in shares)	65,229	64,009
Diluted (in shares)	67,648	66,111
Dividends per Common Share (in dollars per share)	$ 0.36	$ 0.36