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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 26, 2022 | Jun. 27, 2021 | Dec. 31, 2021
Cost: |  |  |
At period start | $ 23.4 |  |
Exchange movements | (0.6) |  |
At period end | 22.8 |  |
Accumulated amortization: |  |  |
Accumulated amortization, beginning balance | 9.7 |  |
Amortization of purchased intangible assets | 0.4 | $ 0.4 |
Exchange movements | (0.3) |  |
Accumulated amortization, ending balance | 9.8 |  |
Net book values: | 13.0 |  | $ 13.7
Customer relationships |  |  |
Cost: |  |  |
At period start | 15.2 |  |
Exchange movements | 0.0 |  |
At period end | 15.2 |  |
Accumulated amortization: |  |  |
Accumulated amortization, beginning balance | 5.7 |  |
Amortization of purchased intangible assets | 0.2 |  |
Exchange movements | 0.0 |  |
Accumulated amortization, ending balance | 5.9 |  |
Net book values: | 9.3 |  | 9.5
Technology and trading related |  |  |
Cost: |  |  |
At period start | 8.2 |  |
Exchange movements | (0.6) |  |
At period end | 7.6 |  |
Accumulated amortization: |  |  |
Accumulated amortization, beginning balance | 4.0 |  |
Amortization of purchased intangible assets | 0.2 |  |
Exchange movements | (0.3) |  |
Accumulated amortization, ending balance | 3.9 |  |
Net book values: | $ 3.7 |  | $ 4.2

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- Definition Finite-Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation Gain (Loss) + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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