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Pension Plans - Schedule of Assumptions Used (Details) - U.K. | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
In respect of defined benefit plans: |  |  |
Discount rate | 5.50% | 5.40% | 4.50%
Expected return on assets | 5.30% | 5.80% | 4.80%
Life expectancy of male in the U.K. aged 65 at accounting date | 20 years 2 months 12 days | 20 years 1 month 6 days |
Life expectancy of female in the U.K. aged 65 at accounting date | 22 years 9 months 18 days | 22 years 8 months 12 days |
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date | 21 years 4 months 24 days | 21 years 3 months 18 days |
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date | 24 years 2 months 12 days | 24 years 1 month 6 days |
Retirement Plan Pre-2030 |  |  |
In respect of defined benefit plans: |  |  |
Retail Price Inflation | 2.80% | 3.20% | 3.10%
Consumer Price Inflation | 1.80% | 2.20% | 2.00%
Retirement Plan Pre-2030 | Pre 6 April 1997 |  |  |
In respect of defined benefit plans: |  |  |
Rate of pension increases | 1.70% | 1.90% | 1.80%
Retirement Plan Pre-2030 | 1997 To 2005 |  |  |
In respect of defined benefit plans: |  |  |
Rate of pension increases | 1.90% | 2.20% | 2.10%
Retirement Plan Pre-2030 | Post 5 April 2005 |  |  |
In respect of defined benefit plans: |  |  |
Rate of pension increases | 1.50% | 1.70% | 1.60%
Retirement Plan Post-2030 |  |  |
In respect of defined benefit plans: |  |  |
Retail Price Inflation | 2.80% | 3.20% | 3.10%
Consumer Price Inflation | 2.60% | 3.00% | 3.00%
Retirement Plan Post-2030 | Pre 6 April 1997 |  |  |
In respect of defined benefit plans: |  |  |
Rate of pension increases | 2.10% | 2.30% | 2.30%
Retirement Plan Post-2030 | 1997 To 2005 |  |  |
In respect of defined benefit plans: |  |  |
Rate of pension increases | 2.60% | 2.90% | 2.90%
Retirement Plan Post-2030 | Post 5 April 2005 |  |  |
In respect of defined benefit plans: |  |  |
Rate of pension increases | 1.90% | 2.00% | 2.00%

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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 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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