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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Apr. 02, 2023 | Dec. 31, 2023
Cost: |  |  |
At period start | $ 23.0 |  |
Exchange movements | (0.1) |  |
At period end | 22.9 |  |
Accumulated amortization: |  |  |
Accumulated amortization, beginning balance | 11.0 |  |
Amortization of purchased intangible assets | 0.2 | $ 0.2 |
Exchange movements | (0.1) |  |
Accumulated amortization, ending balance | 11.1 |  |
Net book values: | 11.8 |  | $ 12.0
Customer relationships |  |  |
Cost: |  |  |
At period start | 15.2 |  |
Exchange movements | 0.0 |  |
At period end | 15.2 |  |
Accumulated amortization: |  |  |
Accumulated amortization, beginning balance | 6.6 |  |
Amortization of purchased intangible assets | 0.1 |  |
Exchange movements | 0.0 |  |
Accumulated amortization, ending balance | 6.7 |  |
Net book values: | 8.5 |  | 8.6
Technology and trading related |  |  |
Cost: |  |  |
At period start | 7.8 |  |
Exchange movements | (0.1) |  |
At period end | 7.7 |  |
Accumulated amortization: |  |  |
Accumulated amortization, beginning balance | 4.4 |  |
Amortization of purchased intangible assets | 0.1 |  |
Exchange movements | (0.1) |  |
Accumulated amortization, ending balance | 4.4 |  |
Net book values: | $ 3.3 |  | $ 3.4

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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 -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 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + 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 -Topic 928 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483147/928-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Amount after 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 -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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