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Revenue Recognition (Instrument Rebate Programs) (Details) - Instrument rebate programs - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Deferred revenue | $ 50.1 | $ 50.1 | $ 57.4
Deferred revenue recognized | $ 4.4 | $ 13.9 |

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