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Divestures and Business Combinations - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jan. 07, 2019 | Dec. 31, 2020
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Dynasty Marketplace, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of voting equity interest |  | 100.00% |
Total purchase consideration |  | $ 60.2 |
Amount retained to satisfy adjustments |  | 6.0 |
Acquisition costs |  | $ 0.3 |
MyCase |  |  |
Business Acquisition [Line Items] |  |  |
Capitalized software |  |  | $ 3.9
MyCase | Discontinued operations, disposed of by sale |  |  |
Business Acquisition [Line Items] |  |  |
Consideration for disposal of subsidiary | $ 193.0 |  |
Proceeds from divestiture of subsidiary | 192.2 |  |
Employee retention bonus pool | 2.2 |  |
Cash divested | 0.8 |  |
Working capital adjustment | $ 0.6 |  |
Retention period | 1 year |  |
Gain on sale of subsidiary | $ 187.7 |  |
Assets divested | 4.6 |  |
Capitalized software | 3.9 |  |
Deferred revenue | 2.8 |  |
Goodwill | 2.3 |  |
Income received | $ 1.1 |  |

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