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ACQUISITIONS (Pro Forma) (Details) - Fusion Packaging - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unaudited pro forma financial information |  |
Net Sales | $ 2,937,303 | $ 2,937,218
Net Income Attributable to AptarGroup Inc. | $ 215,619 | $ 247,263
Net Income per common share — basic (in dollars per share) | $ 3.35 | $ 3.89
Net Income per common share — diluted (in dollars per share) | $ 3.23 | $ 3.74

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