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Supplementary balance sheet information - Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Held-for-sale assets
Held-for-sale assets	$ 4.1	$ 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	3.8	5.5
Inventory	0.3	2.9
Accounts and other receivables	0.0	2.3
Held-for-sale assets	4.1	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	$ 0.4

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