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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Reclassified to held-for-sale assets    
Right-of-use assets $ 3.1 $ 3.8
Reclassified to held-for-sale liabilities    
Accrued liabilities 1.5 1.6
Other current liabilities 5.6 5.1
Held-for-sale liabilities 11.4 12.9
Held-for-sale    
Reclassified to held-for-sale assets    
Property, plant and equipment 11.6 12.4
Inventory 12.6 17.1
Accounts and other receivables 8.7 13.5
Total assets 36.0 46.8
Reclassified to held-for-sale liabilities    
Accounts payables 4.3 6.2
Held-for-sale liabilities $ 11.4 $ 12.9