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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Reclassified to held-for-sale assets
Held-for-sale assets	$ 3.9	$ 10.7
Reclassified to held-for-sale liabilities
Held-for-sale liabilities	0.0	2.5
Held-for-sale
Reclassified to 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
Reclassified to held-for-sale liabilities
Accounts payables	0.0	2.5
Held-for-sale liabilities	$ 0.0	$ 2.5

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