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Acquisitions - Impact of Business Acquisitions (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) acquisition | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) acquisition | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of business acquisitions | acquisition | 2 |  | 2 |
Impact of Business Acquisitions [Abstract] |  |  |  |
Revenues | $ 243.2 | $ 220.2 | $ 433.9 | $ 338.0
Operating income (loss) | (7.0) | $ 66.8 | (34.4) | $ 57.3
Adapt And PaxVax |  |  |  |
Impact of Business Acquisitions [Abstract] |  |  |  |
Revenues | 88.2 |  | 163.1 |
Operating income (loss) | $ 8.2 |  | $ 4.4 |

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