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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, 2022 | Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | $ 23.4 | $ 21.7
Additions |  | 1.8
Exchange movements | (0.8) | (0.1)
Balance at the end of the year | 22.6 | 23.4
Customer relationships |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at the beginning of the year | 15.2 | 13.4
Additions |  | 1.8
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 | 8.2 | 8.3
Additions |  | 0.0
Exchange movements | (0.8) | (0.1)
Balance at the end of the year | $ 7.4 | $ 8.2

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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