Employee Benefits - Assumptions (Details)		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Plans
Benefit obligation:
Discount rate (as a percent)		3.05%	2.75%	3.45%
Net periodic cost:
Return on assets (as a percent)		5.00%	5.50%	6.00%
Retirement Plans | U.S.
Net periodic cost:
Discount rate (as a percent)		2.75%	3.45%	4.40%
Return on assets (as a percent)		5.00%
Retirement Plans | U.S. | Subsequent event
Net periodic cost:
Return on assets (as a percent)	4.00%
Retirement Plans | U.K.
Net periodic cost:
Discount rate (as a percent)		1.36%	1.92%	2.72%
Return on assets (as a percent)		5.50%
Retirement Plans | U.K. | Subsequent event
Net periodic cost:
Return on assets (as a percent)	5.00%
Postretirement Plans
Benefit obligation:
Discount rate (as a percent)		2.72%	2.20%	3.08%
Net periodic cost:
Weighted-average healthcare cost rate (as a percent)			6.00%	6.50%
Postretirement Plans | U.S.
Net periodic cost:
Discount rate (as a percent)		2.20%	3.08%	4.15%