Rationalization Charges - Rationalization Charges by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Rationalization charges	$ 354	$ 1,942	$ 10,711	$ 4,741
Dispensing and Specialty Closures
Restructuring Cost and Reserve [Line Items]
Rationalization charges	67	700	5,298	1,442
Metal Containers
Restructuring Cost and Reserve [Line Items]
Rationalization charges	225	1,153	5,246	3,116
Custom Containers
Restructuring Cost and Reserve [Line Items]
Rationalization charges	$ 62	$ 89	$ 167	$ 183