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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Oct. 01, 2023 | Sep. 25, 2022 | Dec. 31, 2022
Cost: |  |  |
Beginning balance | $ 22.6 |  |
Exchange movements | 0.1 |  |
Ending balance | 22.7 |  |
Accumulated amortization: |  |  |
Beginning balance | 10.1 |  |
Charge | 0.6 | $ 0.6 |
Ending balance | 10.7 |  |
Net book values: | 12.0 |  | $ 12.5
Customer relationships |  |  |
Cost: |  |  |
Beginning balance | 15.2 |  |
Exchange movements | 0.0 |  |
Ending balance | 15.2 |  |
Accumulated amortization: |  |  |
Beginning balance | 6.1 |  |
Charge | 0.3 |  |
Ending balance | 6.4 |  |
Net book values: | 8.8 |  | 9.1
Technology and trading related |  |  |
Cost: |  |  |
Beginning balance | 7.4 |  |
Exchange movements | 0.1 |  |
Ending balance | 7.5 |  |
Accumulated amortization: |  |  |
Beginning balance | 4.0 |  |
Charge | 0.3 |  |
Ending balance | 4.3 |  |
Net book values: | $ 3.2 |  | $ 3.4

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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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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