Revenue Recognition (Reagent Rental Programs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Lease receivable asset	$ 2.6		$ 2.6
Operating-type reagent rental programs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Instruments transferred to property and equipment	3.0	$ 4.1	5.0	$ 8.1
Reagent rental programs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimation of future revenues	$ 33.6		$ 33.6