Retirement Benefits (Net Periodic Benefit Cost (Credit)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 3	$ 9	$ 8
Interest cost	2,387	2,963	7,162	8,889
Expected return on plan assets	(3,708)	(3,153)	(11,124)	(9,458)
Net periodic benefit (credit) cost	(1,318)	(187)	(3,953)	(561)
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	325	266	904	877
Interest cost	379	405	1,052	1,353
Expected return on plan assets	(128)	(144)	(356)	(480)
Amortization of prior service cost	(5)	(6)	(14)	(15)
Net periodic benefit (credit) cost	571	521	1,586	1,735
Other Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	132	175	397	526
Net periodic benefit (credit) cost	$ 133	$ 176	$ 399	$ 528