Pensions and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension charges			$ 49,100
Reduction of unfunded pension liabilities			$ 6,200
Benefit obligation, employer contributions	$ 7,900	$ 9,400
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Reduction of unfunded pension liabilities	(8,801)	(5,463)
Benefit obligation	83,730	230,790		$ 245,800
Benefit obligation period increase (decrease)	(147,000)	(15,000)
Benefit obligation, settlement	91,600
Benefit obligation, net actuarial gain	46,995	7,163
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Reduction of unfunded pension liabilities	(35,658)	(44,884)
Benefit obligation	35,658	44,884		$ 47,977
Benefit obligation period increase (decrease)	(9,200)	(3,100)
Benefit obligation, net actuarial gain	6,658	$ 995
United States
Defined Benefit Plan Disclosure [Line Items]
Accrued postretirement liability	34,800
Switzerland | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	2,900
Canada
Defined Benefit Plan Disclosure [Line Items]
Accrued postretirement liability	$ 800