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Revenue Recognition (Instrument Rebate Programs) (Details) - Instrument rebate programs - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Deferred revenue | $ 52.6 | $ 52.6 | $ 57.4
Deferred revenue recognized | $ 4.6 | $ 9.5 |

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