Pension and Postretirement Health Care (Net Periodic Pension Expense (Benefit)) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Plan
Amortization
Contribution to pension plan	$ 0	$ 50,000,000
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	1,000,000	1,100,000
Interest Cost	1,500,000	1,300,000
Amortization
Net Actuarial Loss (Gain)	1,400,000	1,800,000
Prior Service Cost	0	0
Net Periodic Pension Expense	3,900,000	4,200,000
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0	0
Interest Cost	300,000	300,000
Amortization
Net Actuarial Loss (Gain)	(300,000)	0
Prior Service Cost	0	0
Net Periodic Pension Expense	0	300,000
U.S. Plan | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	10,400,000	10,400,000
Interest Cost	11,800,000	11,100,000
Expected Return on Plan Assets	(21,700,000)	(22,000,000)
Amortization
Net Actuarial Loss (Gain)	4,300,000	7,100,000
Prior Service Cost	(100,000)	(100,000)
Net Periodic Pension Expense	4,700,000	6,500,000
Non U.S. Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	500,000	400,000
Interest Cost	1,000,000	1,000,000
Expected Return on Plan Assets	(1,000,000)	(1,100,000)
Settlement Expense	0	0
Amortization
Net Actuarial Loss (Gain)	100,000	300,000
Net Periodic Pension Expense	$ 600,000	$ 600,000