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Summary of Significant Accounting Policies - Impairment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal related costs | $ 2.0 | $ 12.2 | $ 0.0 |
Other restructuring |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Asset impairment charges and non-cash restructuring charges | 6.5 | 2.8 | 3.2 |
Graphic Arts |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Tangible asset impairment charges |  |  | 12.7 |
Graphic Arts | Operating lease right of use assets |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Tangible asset impairment charges | 1.6 |  | 1.6 |
Disposal related costs | 2.3 | 2.3 |  |
Graphic Arts | Property, Plant and Equipment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Tangible asset impairment charges |  |  | 11.1 |
Graphic Arts | Inventories |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal related costs | 7.5 | 7.5 |  |
Held-for-sale | Graphic Arts |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal related costs |  | 9.8 |  |
Discontinued operations, held-for-sale | Superform U.S Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss on assets held-for-sale | 2.8 | 0.0 | 0.0 | $ 2.6
Disposal related credit | 0.4 | $ 0.4 | $ 0.2 |
Discontinued operations, held-for-sale | Superform U.S Business | Property, Plant and Equipment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss on assets held-for-sale | 0.2 |  |  |
Discontinued operations, held-for-sale | Superform U.S Business | Inventories |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss on assets held-for-sale | 1.4 |  |  |
Discontinued operations, held-for-sale | Superform U.S Business | Use rights |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss on assets held-for-sale | $ 1.2 |  |  |

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