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Held-for-sale assets and liabilities - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 28, 2025 | Sep. 29, 2024 | Jul. 02, 2025 | Sep. 28, 2025 | Sep. 29, 2024 | Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of assets held-for-sale | $ 0.0 | $ 6.1 |  | $ 0.0 | $ 6.1 |
Graphic Arts | 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 |  |  | $ (1.1) |  |  |
Consideration of disposal |  |  | $ 7.3 |  |  |
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 |  |  | $ 6.1 |
Consideration of disposal |  |  |  |  |  | $ 7.3

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