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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Depreciation $ 14.7 $ 12.6 $ 12.0
Impairment charges $ 1.5 0.0 5.2
Discontinued operations | Superform Aluminum Superplastic      
Property, Plant and Equipment [Line Items]      
Impairment charges   $ 0.0 $ 5.2
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    
Minimum | Computer software      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 4 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    
Maximum | Computer software      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 7 years