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Retirement Benefits (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,738 $ 4,011
Interest cost 1,999 2,483
Expected return on assets (5,580) (5,197)
Amortization of net (income) loss 2,730 1,213
Net periodic benefit cost 1,887 2,510
Post-Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 281 141
Interest cost 181 215
Amortization of prior service cost (144) (48)
Net periodic benefit cost $ 318 $ 308