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Held-for-sale assets and liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Held-for-sale assets    
Current assets $ 27.8 $ 8.9
Property, plant and equipment 1.2 1.2
Non-current assets 3.0 3.3
Held-for-sale liabilities    
Held-for-sale liabilities 8.0 3.9
Held-for-sale | Graphic Arts    
Held-for-sale assets    
Inventory 18.0 3.3
Accounts and other receivables 6.8 2.3
Current assets 24.8 5.6
Right-of-use-assets 1.8 2.1
Held-for-sale assets 27.8 8.9
Held-for-sale liabilities    
Accounts payable 2.1 0.9
Accrued liabilities 1.9 0.4
Other liabilities 4.0 2.6
Held-for-sale liabilities $ 8.0 $ 3.9