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Segment financial information - product lines (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation by product line        
Net sales $ 1,720.2 $ 1,856.5 $ 5,244.4 $ 5,717.4
Proprietary materials & consumables        
Disaggregation by product line        
Net sales 629.0 727.4 1,920.4 2,216.7
Third party materials & consumables        
Disaggregation by product line        
Net sales 632.8 665.7 1,929.0 2,078.4
Services & specialty procurement        
Disaggregation by product line        
Net sales 238.6 225.1 712.4 692.3
Equipment & instrumentation        
Disaggregation by product line        
Net sales $ 219.8 $ 238.3 $ 682.6 $ 730.0