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Summary of Significant Accounting Policies - Property, Plant and Equipment Estimated Useful Life (Details)	12 Months Ended
	Dec. 31, 2020
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

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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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