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Pension Plans - Schedule of Assumptions Used (Details) | 12 Months Ended
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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 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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