Pensions and Other Benefit Programs (Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 16	$ 20	$ 69	$ 62
Interest cost	12,719	15,792	39,077	47,378
Expected return on plan assets	(20,932)	(23,182)	(63,539)	(69,545)
Amortization of transition credit	0	0	0	0
Amortization of prior service (credit) cost	(15)	(15)	(45)	(45)
Amortization of net actuarial loss	7,972	6,537	24,367	19,610
Settlement	75	1,477	1,076	2,278
Net periodic benefit cost (income)	(165)	629	1,005	(262)
Contributions to benefit plans	2,061	3,350	5,959	7,401
Defined Benefit Pension Plans | Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	422	385	1,220	1,157
Interest cost	3,548	4,435	10,473	13,231
Expected return on plan assets	(8,297)	(8,340)	(24,474)	(25,609)
Amortization of transition credit	(1)	(2)	(3)	(5)
Amortization of prior service (credit) cost	62	58	182	181
Amortization of net actuarial loss	2,092	1,543	6,156	4,727
Settlement	833	0	4,023	397
Net periodic benefit cost (income)	(1,341)	(1,921)	(2,423)	(5,921)
Contributions to benefit plans	445	652	9,013	9,740
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	229	242	663	725
Interest cost	1,255	1,646	3,742	4,937
Expected return on plan assets	0	0	0	0
Amortization of transition credit	0	0	0	0
Amortization of prior service (credit) cost	93	80	280	241
Amortization of net actuarial loss	926	507	2,400	1,521
Settlement	0	0	0	0
Net periodic benefit cost (income)	2,503	2,475	7,085	7,424
Contributions to benefit plans	$ 2,422	$ 4,628	$ 10,493	$ 13,841