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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets |  |
Gross | $ 21.5 | $ 21.3
Accumulated amortization | (7.9) | (6.7)
Net | 13.6 | 14.6
Customer relationships |  |
Finite-Lived Intangible Assets |  |
Gross | 13.4 | 13.4
Accumulated amortization | (4.6) | (3.8)
Net | 8.8 | 9.6
Technology and trading related |  |
Finite-Lived Intangible Assets |  |
Gross | 8.1 | 7.9
Accumulated amortization | (3.3) | (2.9)
Net | $ 4.8 | $ 5.0

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