Employee Benefit Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Domestic plan [member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligation	2.40%	3.20%
Discount rate, net periodic pension cost	3.20%	4.30%	3.60%
Expected return on plan assets, net periodic pension cost	6.30%	7.00%	7.00%
U.K. plan [member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligation	1.30%	2.10%
Salary inflation, benefit obligation	2.10%	1.60%
Pension inflation, benefit obligation	2.70%	2.80%
Discount rate, net periodic pension cost	2.10%	3.10%	2.60%
Expected return on plan assets, net periodic pension cost	5.00%	5.50%	5.50%
Salary inflation, net periodic pension cost	1.60%	1.80%	1.80%
Pension inflation, net periodic pension cost	2.80%	3.00%	3.00%
International plans [member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligation	1.80%	2.20%
Salary inflation, benefit obligation	2.20%	2.20%
Pension inflation, benefit obligation	1.80%	1.90%
Discount rate, net periodic pension cost	2.00%	3.10%	2.90%
Expected return on plan assets, net periodic pension cost	2.70%	4.30%	4.60%
Salary inflation, net periodic pension cost	2.20%	2.20%	2.20%
Pension inflation, net periodic pension cost	1.90%	1.80%	1.80%