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Other expenses
 12 Months Ended
Dec. 31, 2025
Other Expenses, By Function [Abstract]  
Other expenses 8      Other expenses
2025
2024
2023
$m
$m
$m
Professional fees
98.9
87.5
61.4
Non-trading technology and support
72.7
59.6
45.8
Trading systems and market data
83.3
68.5
54.6
Occupancy and equipment rental
24.4
25.7
23.0
Travel and business development
33.6
25.6
20.6
Communications
10.0
8.4
7.4
Bank fees
10.3
8.7
5.4
Owner fees
0.4
2.4
6.0
VAT (irrecoverable)
6.2
4.6
2.7
Other
14.1
15.3
10.5
353.9
306.3
237.4