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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 12.9 | $ 14.7 | $ 12.6
Impairment charges | $ 0.0 | 1.5 | $ 0.0
Discontinued operations | Superform Aluminum Superplastic |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment charges |  | $ 0.0 |
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 The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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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 No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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