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Summary of Significant Accounting Policies - Property, Plant and Equipment Estimated Useful Life (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 9.1 | $ 9.3 | $ 11.9
Computer equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |
Minimum | Freehold buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Minimum | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Minimum | Heavy production equipment (including casting, rolling, extrusion and press equipment) |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 20 years |  |
Minimum | Chemical production plant and robotics |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 7 years |  |
Minimum | Other production machinery |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |
Minimum | Furniture, fittings, storage and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Maximum | Freehold buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 33 years |  |
Maximum | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 25 years |  |
Maximum | Heavy production equipment (including casting, rolling, extrusion and press equipment) |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 25 years |  |
Maximum | Chemical production plant and robotics |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Maximum | Other production machinery |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Maximum | Furniture, fittings, storage and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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