v3.26.1
RETIREMENT BENEFIT PLANS - Summary of Principal Actuarial Assumptions Used for Defined Benefit Schemes (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure of net defined benefit liability (asset) [abstract]    
- Discount rate for scheme liabilities 5.90% 5.60%
- General price inflation 3.00% 2.90%
- General salary increase 1.00% 1.00%
- Expected rate of pension increase 2.80% 2.80%
Longevity at 60 for current pensioners, on the valuation date:    
- Males 27 years 3 months 18 days 27 years 2 months 12 days
- Females 29 years 2 months 12 days 29 years 1 month 6 days
Longevity at 60 for future pensioners currently aged 40, on the valuation date:    
- Males 28 years 9 months 18 days 28 years 8 months 12 days
- Females 30 years 8 months 12 days 30 years 7 months 6 days