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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

Disposal Group, Including Discontinued Operation, Asset Impairment Charge

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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

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-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

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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.

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