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Acquisitions - 2018 Acquisitions (Details) - USD ($) $ in Millions | Jul. 02, 2018 | May 15, 2018 | Dec. 31, 2020 | Dec. 31, 2019
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StudyBlue, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total fair value of purchase consideration | $ 20.4 |  |  |
Escrow | $ 3.3 |  |  |
WriteLab, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total fair value of purchase consideration |  | $ 14.5 |  |
Escrow |  | 2.6 |  |
Contingent consideration arrangements |  | $ 5.0 |  |
Contingent purchase consideration, cash |  |  | $ 1.0 | $ 1.0

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