ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands						12 Months Ended
	Oct. 01, 2021	Sep. 30, 2021	Sep. 20, 2021	Jun. 01, 2020	Feb. 04, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired						$ 745,670	$ 940,875	$ 0
Goodwill						$ 2,038,408	$ 1,741,496	$ 1,142,223
Silgan Specialty Packaging
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired			$ 483,800
Goodwill			204,800
Silgan Specialty Packaging | Customer Relationships
Business Acquisition [Line Items]
Customer relationship intangible asset			$ 169,000
Estimated remaining life			21 years
Silgan Specialty Packaging | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Customer relationship intangible asset			$ 3,400
Estimated remaining life			5 years
Unicep Packaging LLC
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired		$ 236,900
Goodwill		142,600
Unicep Packaging LLC | Customer Relationships
Business Acquisition [Line Items]
Customer relationship intangible asset		$ 74,000
Estimated remaining life		17 years
Unicep Packaging LLC | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Customer relationship intangible asset		$ 4,000
Estimated remaining life		10 years
Unicep Packaging LLC | Trade names
Business Acquisition [Line Items]
Customer relationship intangible asset		$ 3,600
Estimated remaining life		10 years
Easytech Closures S.p.A.
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired	$ 27,200
Goodwill	12,900
Easytech Closures S.p.A. | Customer Relationships
Business Acquisition [Line Items]
Customer relationship intangible asset	$ 3,100
Cobra Plastics, Inc. Business Acquisition
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired					$ 39,800
Goodwill					18,600
Cobra Plastics, Inc. Business Acquisition | Customer Relationships
Business Acquisition [Line Items]
Customer relationship intangible asset					$ 11,500
Albea Dispensing Business, Business Acquisition
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired				$ 898,700
Goodwill				500,400
Albea Dispensing Business, Business Acquisition | Customer Relationships
Business Acquisition [Line Items]
Customer relationship intangible asset				255,000
Albea Dispensing Business, Business Acquisition | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Customer relationship intangible asset				$ 28,000