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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%