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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Reclassified to held-for-sale assets    
Held-for-sale assets $ 10.7 $ 0.0
Reclassified to held-for-sale liabilities    
Held-for-sale liabilities 2.5 $ 0.0
Held-for-sale    
Reclassified to held-for-sale assets    
Property, plant and equipment 5.5  
Inventory 2.9  
Accounts and other receivables 2.3  
Held-for-sale assets 10.7  
Reclassified to held-for-sale liabilities    
Accounts payables 2.5  
Held-for-sale liabilities $ 2.5