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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Finite-Lived Intangible Assets |  |  |
Gross | $ 22.6 | $ 23.4 | $ 21.7
Accumulated amortization | (10.1) | (9.7) |
Net | 12.5 | 13.7 |
Customer relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Gross | 15.2 | 15.2 | 13.4
Accumulated amortization | (6.1) | (5.7) |
Net | 9.1 | 9.5 |
Technology and trading related |  |  |
Finite-Lived Intangible Assets |  |  |
Gross | 7.4 | 8.2 | $ 8.3
Accumulated amortization | (4.0) | (4.0) |
Net | $ 3.4 | $ 4.2 |

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