Revenue Recognition (Reagent Rental Programs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Lease receivable asset	$ 7.9		$ 7.9		$ 7.2
Lease receivable asset reclassified to accounts receivable	0.3		0.7
Operating-type reagent rental programs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Instruments transferred to property and equipment	1.7	$ 3.0	4.1	$ 5.0
Reagent rental programs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimation of future revenues	$ 26.6		$ 26.6