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Acquisitions (Details) - Mathway, LLC - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 04, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Fair value of purchase consideration | $ 101.0 |  |  |  |
Initial cash consideration | 93.5 |  |  |  |
Escrow | $ 7.5 |  |  |  |
Remaining escrow release period | 15 months |  |  |  |
Contingent payments | $ 15.0 |  |  |  |
Contingent consideration, liability |  | $ 0.4 |  | $ 0.4 |
Acquisition related costs |  | 3.1 |  |  |
Pro forma net income (loss) |  | $ 12.7 | $ (12.6) | $ 4.8 | $ (19.2)

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