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Goodwill - Schedule of reasonable possible changes (Details)
 12 Months Ended
Dec. 31, 2019
Bioscience  
Disclosure of information for cash-generating units [line items]  
Reasonably possible change in perpetual growth rate (as a percent) 0.50%
Reasonably possible change in pre-tax discount rate (as a percent) 0.50%
Diagnostic  
Disclosure of information for cash-generating units [line items]  
Reasonably possible change in EBITDA margin multiple (as a percent) 2.50%
Hospital  
Disclosure of information for cash-generating units [line items]  
Reasonably possible change in perpetual growth rate (as a percent) 0.50%
Reasonably possible change in pre-tax discount rate (as a percent) 0.50%