Employee Benefit Plans - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net periodic benefit cost for the years ended December 31:
Healthcare cost trend rate assumed for next year	6.00%	6.30%
Rate that the cost trend rate gradually declines to	5.00%	5.00%
Pension | United States
Benefit obligations as of December 31:
Discount rate	2.98%	2.60%	3.32%
Rate of compensation increase	2.75%	2.75%	2.75%
Interest crediting rates for cash balance plan, year one	2.45%	2.44%	3.22%
Interest crediting rates for cash balance plan, year two	2.56%	2.25%	2.94%
Interest crediting rates for cash balance plan, year three	2.56%	2.25%	2.94%
Interest crediting rates for cash balance plan, year four	2.83%	2.65%	3.02%
Interest crediting rates for cash balance plan, year five		2.65%	3.02%
Interest crediting rates for cash balance plan, year six			3.02%
Net periodic benefit cost for the years ended December 31:
Discount rate	2.60%	3.32%	4.25%
Expected return on plan assets	5.39%	5.94%	6.48%
Rate of compensation increase	2.75%	2.75%	2.75%
Interest crediting rates for cash balance plan	2.45%	2.44%	3.22%
Pension | United Kingdom
Benefit obligations as of December 31:
Discount rate	1.95%	1.40%	2.10%
Rate of compensation increase	3.45%	3.05%	3.30%
Rate of future price inflation	2.95%	2.55%	2.80%
Net periodic benefit cost for the years ended December 31:
Discount rate	1.40%	2.10%	2.90%
Expected return on plan assets	4.85%	5.00%	5.10%
Rate of compensation increase	3.05%	3.30%	3.55%
Rate of future price inflation	2.55%	2.80%	3.05%
Other Postretirement
Benefit obligations as of December 31:
Discount rate	2.95%	2.59%	3.24%
Net periodic benefit cost for the years ended December 31:
Discount rate	2.59%	3.24%	4.21%
Expected return on plan assets	3.35%	5.42%	6.39%