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Revenue Recognition (Reagent Rental Programs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Lease receivable asset $ 9.2   $ 9.2   $ 7.2
Lease receivable asset reclassified to accounts receivable 0.3   1.0    
Operating-type reagent rental programs          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Instruments transferred to property and equipment 2.6 $ 5.5 6.6 $ 10.5  
Reagent rental programs          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Estimation of future revenues $ 25.9   $ 25.9