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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details)
$ in Millions
Jun. 27, 2021
USD ($)
building
Dec. 31, 2020
USD ($)
building
Held-for-sale assets    
Held-for-sale assets $ 20.1 $ 36.0
Held-for-sale liabilities    
Held-for-sale liabilities 6.5 11.4
Held-for-sale | Superform Aluminum Superplastic    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Amount of property disposed 5.1 11.6
Held-for-sale assets    
Property, plant and equipment 5.1 11.6
Right-of-use-assets from operating leases 2.6 3.1
Inventory 5.9 12.6
Accounts and other receivables 6.5 8.7
Held-for-sale assets 20.1 36.0
Held-for-sale liabilities    
Accounts payable 2.3 4.3
Accrued liabilities 1.0 1.5
Other current liabilities 3.2 5.6
Held-for-sale liabilities $ 6.5 $ 11.4
Held-for-sale | Building | Elektron    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of properties to be disposed | building 1 1
Amount of property disposed $ 3.7 $ 3.7
Held-for-sale assets    
Property, plant and equipment $ 3.7 $ 3.7