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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets |  |
Gross | $ 21.0 | $ 21.5
Accumulated amortization | (8.2) | (7.9)
Net | 12.8 | 13.6
Customer relationships |  |
Finite-Lived Intangible Assets |  |
Gross | 13.4 | 13.4
Accumulated amortization | (4.9) | (4.6)
Net | 8.5 | 8.8
Technology and trading related |  |
Finite-Lived Intangible Assets |  |
Gross | 7.6 | 8.1
Accumulated amortization | (3.3) | (3.3)
Net | $ 4.3 | $ 4.8

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