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Exchange rates
12 Months Ended
Dec. 31, 2025
Disclosure Of Exchange Rates [Abstract]  
Exchange rates 1. Exchange rates
2025
2024
2023
$1 equivalent
Average
Closing
Average
Closing
Average
Closing
Sterling
£0.76
£0.74
£0.78
£0.80
£0.80
£0.78
Euro
€0.89
€0.85
€0.92
€0.96
€0.92
€0.90