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Segment financial information - product lines (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation by product line                      
Net sales $ 1,524.0 $ 1,503.8 $ 1,532.4 $ 1,480.1 $ 1,473.9 $ 1,494.2 $ 1,477.9 $ 1,418.3 $ 6,040.3 $ 5,864.3 $ 1,247.4
Proprietary materials & consumables                      
Disaggregation by product line                      
Net sales                 2,008.5 1,933.9  
Third party materials & consumables                      
Disaggregation by product line                      
Net sales                 2,395.6 2,364.9  
Services & specialty procurement                      
Disaggregation by product line                      
Net sales                 735.6 663.5  
Equipment & instrumentation                      
Disaggregation by product line                      
Net sales                 $ 900.6 $ 902.0