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Impact of COVID-19 and foreign exchange rates (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
forward_contract
Dec. 31, 2021
USD ($)
forward_contract
Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items]      
Gross accumulated currency translation adjustments $ 39.9 $ 27.1  
Foreign Exchange Forward      
Unusual or Infrequent Item, or Both [Line Items]      
Number of open foreign exchange forward contracts | forward_contract 194 33  
Derivative, notional value $ 11.9 $ 2.6  
Revenue Benchmark | Currency Concentration Risk | Currencies Other Than United States Dollar      
Unusual or Infrequent Item, or Both [Line Items]      
Concentration percentage 21.60% 7.40% 5.70%
Routine Clinical Test      
Unusual or Infrequent Item, or Both [Line Items]      
Change in testing volume (as a percent) 2.00%    
Services      
Unusual or Infrequent Item, or Both [Line Items]      
Increase (decrease) in revenue $ (851.5)