Employee Retirement and Pension Benefits - Narratives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S.
Defined Benefit Plan Disclosure
Discount rate, percentage	3.31%	4.27%
Estimated pension benefit expense from amortization of net actuarial pension loss	$ 7,200
Company contribution	7,760	$ 4,125
Anticipated contribution during the period	8,100
Accumulated benefit obligation	433,400
Non U.S
Defined Benefit Plan Disclosure
Estimated pension benefit expense from amortization of net actuarial pension loss	400
Company contribution	236	250
Accumulated benefit obligation	39,500
Expected contributions to plan in 2020	13,700
Other Pension Plan | Non U.S
Defined Benefit Plan Disclosure
Defined contribution plan, accrued liabilities	1,300	2,600
Compensation expense	$ 24,600	$ 27,000	$ 23,800