Employee Benefits - Weighted-average assumptions used to determine the net periodic benefit cost (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets, net of administration expenses	6.56%		7.05%
U.S. | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.12%	2.36%	3.92%
Expected return on plan assets, net of administration expenses	2.65%	3.30%
U.S. | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.79%	2.76%	4.26%
Expected return on plan assets, net of administration expenses	6.56%	7.04%
U.K.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.20%	1.89%	2.95%
Expected return on plan assets, net of administration expenses	2.04%	2.74%	3.64%
U.K. | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Rate of compensation increase	3.22%	3.24%	3.73%
U.K. | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Rate of compensation increase	3.72%	3.74%	4.23%
Other | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	0.28%	0.74%	1.89%
Expected return on plan assets, net of administration expenses	1.70%	2.10%	2.50%
Rate of compensation increase	1.00%	1.00%	1.00%
Other | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.00%	2.90%	3.88%
Expected return on plan assets, net of administration expenses	2.65%	3.10%	4.10%
Rate of compensation increase	3.00%	3.00%	3.00%