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Revenue Recognition (Reagent Rental Programs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Lease receivable asset $ 7.7   $ 7.2
Lease receivable asset reclassified to accounts receivable 0.4    
Operating-type reagent rental programs      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Instruments transferred to property and equipment 2.3 $ 2.0  
Reagent rental programs      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Estimation of future revenues $ 28.8