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Revenue Recognition (Instrument Rebate Programs) (Details) - Instrument rebate programs - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenue $ 37.4 $ 39.3
Deferred revenue recognized $ 3.9