Rationalization Charges Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Rationalization charges	$ 39,317	$ 492	$ 45,400	$ 1,195
Metal containers plant closings and Central States Pension Plan withdrawal [Member]
Restructuring Cost and Reserve [Line Items]
Rationalization charges	38,700
Metal container plant closings [Member]
Restructuring Cost and Reserve [Line Items]
Rationalization charges	2,500
Remaining expenses for this rationalization plan	1,200		1,200
Remaining cash expenditures for this rationalization plan			2,900
Central States Pension Plan withdrawal [Member]
Restructuring Cost and Reserve [Line Items]
Rationalization charges	36,200
Metal container plant closings [Member]
Restructuring Cost and Reserve [Line Items]
Rationalization charges			437
Metal container plant closings [Member] | Metal containers plant closings and Central States Pension Plan withdrawal [Member]
Restructuring Cost and Reserve [Line Items]
Expected cost	3,700		3,700
Central States Pension Plan withdrawal [Member] | Metal containers plant closings and Central States Pension Plan withdrawal [Member]
Restructuring Cost and Reserve [Line Items]
Expected cost	56,400		$ 56,400
Annually over the next twenty years [Member] | Central States Pension Plan withdrawal [Member]
Restructuring Cost and Reserve [Line Items]
Remaining cash expenditures for this rationalization plan	2,800
Accretion Expense	$ 1,000