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Segment financial information - product lines (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation by product line                      
Net sales $ 1,790.9 $ 1,605.0 $ 1,478.7 $ 1,519.0 $ 1,524.0 $ 1,503.8 $ 1,532.4 $ 1,480.1 $ 6,393.6 $ 6,040.3 $ 5,864.3
Proprietary materials & consumables                      
Disaggregation by product line                      
Net sales                 2,043.6 1,765.4 1,688.3
Third party materials & consumables                      
Disaggregation by product line                      
Net sales                 2,671.8 2,583.6 2,570.9
Services & specialty procurement                      
Disaggregation by product line                      
Net sales                 817.5 778.9 696.0
Equipment & instrumentation                      
Disaggregation by product line                      
Net sales                 $ 860.7 $ 912.4 $ 909.1