Pensions and Other Benefit Programs (Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26	$ 26
Interest cost	10,745	13,179
Expected return on plan assets	(19,478)	(21,304)
Amortization of transition credit	0	0
Amortization of prior service (credit) cost	(15)	(15)
Amortization of net actuarial loss	9,638	8,198
Settlement	0	389
Net periodic benefit cost (income)	916	473
Contributions to benefit plans	1,015	1,929
Defined Benefit Pension Plans | Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	395	399
Interest cost	2,961	3,518
Expected return on plan assets	(7,984)	(8,208)
Amortization of transition credit	0	(1)
Amortization of prior service (credit) cost	67	61
Amortization of net actuarial loss	2,345	2,059
Settlement	0	0
Net periodic benefit cost (income)	(2,216)	(2,172)
Contributions to benefit plans	8,696	7,988
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	224	217
Interest cost	961	1,245
Expected return on plan assets	0	0
Amortization of transition credit	0	0
Amortization of prior service (credit) cost	32	93
Amortization of net actuarial loss	1,078	736
Settlement	0	0
Net periodic benefit cost (income)	2,295	2,291
Contributions to benefit plans	$ 3,519	$ 4,455