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Pension Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
U.K.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.90%	1.40%	2.10%
Expected return on assets	3.30%	3.00%	4.10%
Life expectancy of male in the U.K. aged 65 at accounting date	21 years 1 month 6 days	21 years 6 months
Life expectancy of female in the U.K. aged 65 at accounting date	22 years 10 months 24 days	24 years 3 months 18 days
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date	22 years 4 months 24 days	22 years 10 months 24 days
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date	24 years 4 months 24 days	25 years 9 months 18 days
U.K. | Retirement Plan Pre-2030
Defined Benefit Plan Disclosure [Line Items]
Retail Price Inflation	3.30%	2.90%	2.90%
Consumer Price Inflation	2.20%	1.80%	2.00%
U.K. | Retirement Plan Pre-2030 | Pre 6 April 1997
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.00%	1.70%	1.80%
U.K. | Retirement Plan Pre-2030 | 1997 To 2005
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.20%	1.90%	2.10%
U.K. | Retirement Plan Pre-2030 | Post 5 April 2005
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	1.80%	1.60%	1.70%
U.K. | Retirement Plan Post-2030
Defined Benefit Plan Disclosure [Line Items]
Retail Price Inflation	3.30%	2.70%	2.90%
Consumer Price Inflation	3.20%	2.60%	2.00%
U.K. | Retirement Plan Post-2030 | Pre 6 April 1997
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.50%	2.20%	1.80%
U.K. | Retirement Plan Post-2030 | 1997 To 2005
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	3.10%	2.60%	2.10%
U.K. | Retirement Plan Post-2030 | Post 5 April 2005
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.20%	2.00%	1.70%
U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.70%	2.30%	3.10%
Expected return on assets	2.50%	5.00%	6.20%

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

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