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Treasury Stock	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Treasury Stock	Treasury Stock On October 17, 2016, our Board of Directors authorized the repurchase by us of up to an aggregate of $300.0 million of our common stock by various means from time to time through and including December 31, 2021. We did not repurchase any shares of our common stock pursuant to this authorization during the three months ended March 31, 2021. At March 31, 2021, we had approximately $76.6 million remaining under this authorization for the repurchase of our common stock. During the first three months of 2021, we issued 545,168 treasury shares which had an average cost of $3.19 per share for restricted stock units that vested during the period. In accordance with the Silgan Holdings Inc. Amended and Restated 2004 Stock Incentive Plan, we repurchased 215,934 shares of our common stock at an average cost of $38.33 to satisfy minimum employee withholding tax requirements resulting from the vesting of such restricted stock units. We account for treasury shares using the first-in, first-out (FIFO) cost method.  As of March 31, 2021, 64,726,235 shares of our common stock were held in treasury.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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