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Held-for-sale assets and liabilities - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2024 | Oct. 01, 2023 | Sep. 29, 2024 | Oct. 01, 2023 | Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on held for sale asset group |  |  | $ 7.5 | $ 0.0 |
Restructuring charges | $ 0.5 | $ 1.6 | 2.3 | 4.4 |
Gain on disposal of assets held-for-sale | 6.1 | $ 0.0 | 6.1 | $ 0.0 |
Graphic Arts | Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on held for sale asset group | 7.5 |  |  |  |
Restructuring charges |  |  | $ 1.4 |  |
Elektron | Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on disposal of assets held-for-sale | $ 6.1 |  |  |  |
Elektron | Held-for-sale | Subsequent event |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration of disposal |  |  |  |  | $ 7.3

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