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Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Change in net unrealized loss during period | $ (613.1) | $ (113.7) | $ 61.8 |
Reclassification adjustment for net gains included in net income | 24.4 | (1.1) | (0.3) |
Accumulated other comprehensive income (loss) | 3,073.8 | 1,986.6 | $ 1,959.8 | $ 2,013.9
Net unrealized loss on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ (471.0) | $ (29.0) |  |

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