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Subsequent events- Additional Information (Details) - USD ($) $ in Millions | Oct. 15, 2022 | Sep. 30, 2022 | Dec. 31, 2021
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Subsequent Events |  |  |
Developed technology - Software intangible assets |  | $ 0.7 | $ 0.7
Subsequent event | US Treasury Securities |  |  |
Subsequent Events |  |  |
Available-for-sale transfer to Held-to-maturity, unrealized losses before tax | $ 873.1 |  |
Available-for-sale securities transfer to Held-to-maturity | 6,500.0 |  |
Available-for-sale securities transfer to Held-to-Maturity at par value | $ 7,400.0 |  |

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