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Pension Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
U.K.
In respect of defined benefit plans:
Discount rate	4.50%	4.80%	1.90%
Expected return on assets	4.80%	5.60%	3.30%
Life expectancy of male in the U.K. aged 65 at accounting date	21 years 2 months 12 days	21 years 2 months 12 days
Life expectancy of female in the U.K. aged 65 at accounting date	23 years 1 month 6 days	23 years
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date	22 years 6 months	22 years 6 months
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date	24 years 7 months 6 days	24 years 6 months
U.K. | Retirement Plan Pre-2030
In respect of defined benefit plans:
Retail Price Inflation	3.10%	3.20%	3.30%
Consumer Price Inflation	2.00%	2.10%	2.20%
U.K. | Retirement Plan Pre-2030 | Pre 6 April 1997
In respect of defined benefit plans:
Rate of pension increases	1.80%	1.90%	2.00%
U.K. | Retirement Plan Pre-2030 | 1997 To 2005
In respect of defined benefit plans:
Rate of pension increases	2.10%	2.10%	2.20%
U.K. | Retirement Plan Pre-2030 | Post 5 April 2005
In respect of defined benefit plans:
Rate of pension increases	1.60%	1.70%	1.80%
U.K. | Retirement Plan Post-2030
In respect of defined benefit plans:
Retail Price Inflation	3.10%	3.20%	3.30%
Consumer Price Inflation	3.00%	3.10%	3.20%
U.K. | Retirement Plan Post-2030 | Pre 6 April 1997
In respect of defined benefit plans:
Rate of pension increases	2.30%	2.40%	2.50%
U.K. | Retirement Plan Post-2030 | 1997 To 2005
In respect of defined benefit plans:
Rate of pension increases	2.90%	3.00%	3.10%
U.K. | Retirement Plan Post-2030 | Post 5 April 2005
In respect of defined benefit plans:
Rate of pension increases	2.00%	2.20%	2.20%
U.S. / other
In respect of defined benefit plans:
Discount rate		5.10%	2.70%
Expected return on assets		4.70%	2.50%

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- Definition

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
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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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
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-8

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-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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