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Supplementary balance sheet information - Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 29, 2019	Dec. 31, 2018
Held-for-sale assets
Held-for-sale assets	$ 3.9	$ 10.7
Held-for-sale liabilities
Held-for-sale liabilities	0.0	2.5
Held-for-sale
Held-for-sale assets
Property, plant and equipment	3.7	5.5
Inventory	0.2	2.9
Accounts and other receivables	0.0	2.3
Held-for-sale assets	3.9	10.7
Held-for-sale liabilities
Accounts payable	0.0	2.5
Held-for-sale liabilities	0.0	2.5
Elektron | Held-for-sale
Held-for-sale assets
Held-for-sale assets	3.7	10.7
Gas Cylinders | Held-for-sale
Held-for-sale assets
Held-for-sale assets	$ 0.2	$ 0.0

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