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Business combinations - general information (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Cash paid for acquisitions, net of cash acquired   $ 0.0 $ 0.0 $ 6,660.7
Reporting unit allocation     0.0  
Americas        
Business Acquisition [Line Items]        
Reporting unit allocation     1,609.4  
Europe        
Business Acquisition [Line Items]        
Reporting unit allocation     1,164.0  
AMEA        
Business Acquisition [Line Items]        
Reporting unit allocation     $ 29.6  
VWR        
Business Acquisition [Line Items]        
Cash paid for acquisitions, net of cash acquired       6,579.8
Transaction costs       40.7
Net sales of acquiree included in our results       552.0
Operating loss of acquiree included in our results       39.4
VWR | Americas        
Business Acquisition [Line Items]        
Reporting unit allocation $ 1,412.1      
VWR | Europe        
Business Acquisition [Line Items]        
Reporting unit allocation 1,156.9      
VWR | AMEA        
Business Acquisition [Line Items]        
Reporting unit allocation $ 12.3      
Other        
Business Acquisition [Line Items]        
Cash paid for acquisitions, net of cash acquired       $ 80.9