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Supplementary balance sheet information - Additional information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Not discontinued operation, disposal cost and loss (gain) on write-down $ 12.2 $ 0.0 $ 0.3
Graphic Arts      
Property, Plant and Equipment [Line Items]      
Tangible asset impairment charges   12.7  
Graphic Arts | Property, Plant and Equipment      
Property, Plant and Equipment [Line Items]      
Tangible asset impairment charges   11.1  
Graphic Arts | Operating lease right of use assets      
Property, Plant and Equipment [Line Items]      
Not discontinued operation, disposal cost and loss (gain) on write-down 2.3    
Tangible asset impairment charges 1.6 $ 1.6  
Graphic Arts | Inventories      
Property, Plant and Equipment [Line Items]      
Not discontinued operation, disposal cost and loss (gain) on write-down $ 7.5