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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 27, 2020
Dec. 31, 2019
Held-for-sale assets    
Held-for-sale assets $ 3.7 $ 3.9
Held-for-sale    
Held-for-sale assets    
Property, plant and equipment 3.7 3.7
Inventory 0.0 0.2
Held-for-sale assets $ 3.7 $ 3.9