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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, 2023 | Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | $ 22.6 | $ 23.4
Exchange movements | 0.4 | (0.8)
Balance at the end of the year | 23.0 | 22.6
Customer relationships |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | 15.2 | 15.2
Exchange movements | 0.0 | 0.0
Balance at the end of the year | 15.2 | 15.2
Technology and trading related |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | 7.4 | 8.2
Exchange movements | 0.4 | (0.8)
Balance at the end of the year | $ 7.8 | $ 7.4

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 928 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483147/928-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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