Rationalization Charges - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 45,595	$ 41,560
Other Restructuring | Rationalization Plan
Restructuring Cost and Reserve [Line Items]
Remaining expenses	2,500
Remaining cash expenditures	8,300
Annually Through 2040 | Central States Pension Plan withdrawal
Restructuring Cost and Reserve [Line Items]
Remaining cash expenditures	3,100
Accretion expense	1,100
Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	8,900
Other Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 36,700