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Investments - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Investments [Abstract] |  |  |  |
Realized gain (loss) on marketable securities | $ 4.5 | $ 1.0 | $ 4.2 | $ 0.4

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- Definition Amount of realized gain (loss) on investment in debt and equity securities. + References No definition available. + Details
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- References No definition available. + Details
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