Rationalization Charges - Rationalization Charges by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Rationalization charges	$ 2,315	$ 2,505	$ 13,026	$ 7,247
Dispensing and Specialty Closures
Restructuring Cost and Reserve [Line Items]
Rationalization charges	406	787	5,704	2,229
Metal Containers
Restructuring Cost and Reserve [Line Items]
Rationalization charges	1,822	1,639	7,068	4,755
Custom Containers
Restructuring Cost and Reserve [Line Items]
Rationalization charges	$ 87	$ 79	$ 254	$ 263