Pension and Postretirement Health Care (Net Periodic Pension Expense (Benefit)) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Plan
Amortization
Contribution to pension plan	$ 0	$ 0
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	1,100,000	1,000,000.0
Interest Cost	1,200,000	1,500,000
Amortization
Net Actuarial Loss (Gain)	1,800,000	1,400,000
Prior Service Cost	0	0
Net Periodic Pension Expense	4,100,000	3,900,000
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Interest Cost	200,000	300,000
Amortization
Net Actuarial Loss (Gain)	(200,000)	(300,000)
Net Periodic Pension Expense	0	0
U.S. Plan | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	11,800,000	10,400,000
Interest Cost	10,800,000	11,800,000
Expected Return on Plan Assets	(19,200,000)	(21,700,000)
Amortization
Net Actuarial Loss (Gain)	8,800,000	4,300,000
Prior Service Cost	(100,000)	(100,000)
Net Periodic Pension Expense	12,100,000	4,700,000
Non U.S. Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	500,000	500,000
Interest Cost	700,000	1,000,000.0
Expected Return on Plan Assets	(700,000)	(1,000,000.0)
Settlement Expense	200,000	0
Amortization
Net Actuarial Loss (Gain)	300,000	100,000
Net Periodic Pension Expense	$ 1,000,000.0	$ 600,000