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Retirement Benefits (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,738,000 $ 2,041,000 $ 5,476,000 $ 6,052,000
Interest cost 1,999,000 2,563,000 3,998,000 5,046,000
Expected return on assets (5,580,000) (5,197,000) (11,161,000) (10,394,000)
Amortization of net (income) loss 2,731,000 2,462,000 5,461,000 3,675,000
Net periodic benefit cost 1,888 1,869 3,774,000 4,379,000
Post-Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 281,000 311,000 564,000 452,000
Interest cost 181,000 215,000 362,000 429,000
Amortization of prior service cost (144,000) (176,000) (289,000) (224,000)
Net periodic benefit cost $ 318,000 $ 350,000 $ 637,000 $ 657,000