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Goodwill and other identifiable intangible assets - Schedule of Movements in Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | $ 23.3 | $ 23.0
Additions |  | 0.4
Exchange movements | 0.5 | (0.1)
Balance at the end of the year | 23.8 | 23.3
Customer relationships |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | 15.6 | 15.2
Additions |  | 0.4
Exchange movements | 0.0 | 0.0
Balance at the end of the year | 15.6 | 15.6
Technology and trading related |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | 7.7 | 7.8
Additions |  | 0.0
Exchange movements | 0.5 | (0.1)
Balance at the end of the year | $ 8.2 | $ 7.7

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