Pension and Postretirement Health Care (Net Periodic Pension Expense (Benefit)) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Pension Plan
Amortization
Contribution to pension plan			$ 0	$ 0
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	$ 1,300,000	$ 1,100,000	2,600,000	2,200,000
Interest Cost	1,000,000.0	1,200,000	1,900,000	2,400,000
Amortization
Actuarial Loss (Gain)	2,000,000.0	1,800,000	4,100,000	3,600,000
Prior Service Cost	0	100,000	0	100,000
Net Periodic Pension Expense	4,300,000	4,200,000	8,600,000	8,300,000
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0	0	0	0
Interest Cost	100,000	200,000	200,000	400,000
Amortization
Actuarial Loss (Gain)	0	(200,000)	(100,000)	(400,000)
Prior Service Cost	(300,000)	0	(500,000)	0
Net Periodic Pension Expense	(200,000)	0	(400,000)	0
U.S Plans
Amortization
Defined benefit plan, plan assets, period increase (decrease)			7,100,000
U.S Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	13,200,000	11,800,000	26,400,000	23,600,000
Interest Cost	9,800,000	10,800,000	19,600,000	21,600,000
Expected Return on Plan Assets	(20,100,000)	(19,200,000)	(40,200,000)	(38,400,000)
Amortization
Actuarial Loss (Gain)	9,400,000	8,800,000	18,800,000	17,600,000
Prior Service Cost	(100,000)	(100,000)	(200,000)	(200,000)
Settlement Expense	17,600,000	0	17,600,000	0
Net Periodic Pension Expense	$ 29,800,000	12,100,000	42,000,000.0	24,200,000
Payment for settlement			$ 17,600,000
Discount rate	3.05%		3.05%
Expected long-term rate of return on plan assets			5.25%
Settlement expense	$ 74,500,000
Benefit obligation	1,396,100,000		$ 1,396,100,000		$ 1,470,600,000
U.S Plans | Supplemental Plan
Amortization
Contribution to pension plan			6,700,000	10,600,000
Non U.S. Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	600,000	500,000	1,100,000	1,000,000.0
Interest Cost	500,000	700,000	1,100,000	1,400,000
Expected Return on Plan Assets	(700,000)	(800,000)	(1,300,000)	(1,500,000)
Amortization
Actuarial Loss (Gain)	200,000	300,000	500,000	600,000
Prior Service Cost	100,000	0	100,000	0
Settlement Expense	700,000	0	900,000	200,000
Net Periodic Pension Expense	$ 1,400,000	$ 700,000	$ 2,400,000	$ 1,700,000