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Capitalized Software Development Costs, net - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Capitalized software development costs during the period | $ 27.3 | $ 23.6 | $ 13.8 |
Amortization expense with respect to software development costs during the period | 17.9 | $ 14.0 | $ 11.0 |
MyCase |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Capitalized software | $ 3.9 |  |  |
Discontinued operations, disposed of by sale | MyCase |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Capitalized software |  |  |  | $ 3.9

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