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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 26, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets |  |
Gross | $ 21.7 | $ 21.7
Accumulated amortization | (9.5) | (8.9)
Net | 12.2 | 12.8
Customer relationships |  |
Finite-Lived Intangible Assets |  |
Gross | 13.4 | 13.4
Accumulated amortization | (5.5) | (5.2)
Net | 7.9 | 8.2
Technology and trading related |  |
Finite-Lived Intangible Assets |  |
Gross | 8.3 | 8.3
Accumulated amortization | (4.0) | (3.7)
Net | $ 4.3 | $ 4.6

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