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Summary of Significant Accounting Policies - Internal Use Software (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |  |
Capitalized internal-use software development costs | $ 40.6 | $ 35.6 | $ 3.3

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