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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details)
$ in Millions
Mar. 28, 2021
USD ($)
building
Dec. 31, 2020
USD ($)
building
Held-for-sale assets    
Right-of-use-assets from operating leases $ 2.9 $ 3.1
Held-for-sale assets 20.7 36.0
Held-for-sale liabilities    
Accrued liabilities 1.1 1.5
Other current liabilities 3.3 5.6
Held-for-sale liabilities 7.3 11.4
Held-for-sale    
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
Inventory 6.3 12.6
Accounts and other receivables 6.4 8.7
Held-for-sale assets 20.7 36.0
Held-for-sale liabilities    
Accounts payable 2.9 4.3
Held-for-sale liabilities $ 7.3 $ 11.4
Held-for-sale | Building | Elektron segment    
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