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Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Change in net unrealized gain during period | $ 144.8 | $ (613.1) | $ (113.7) |
Reclassification adjustment for net losses included in net income | 23.5 | 24.4 | (1.1) |
Accumulated other comprehensive income (loss) | 3,227.5 | 3,073.8 | 1,986.6 | $ 1,959.8
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0.6 | (4.9) | 3.1 |
Net unrealized loss on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (350.1) | (471.0) |  |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | (5.6) | (4.5) |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (0.8) | (1.6) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ (356.5) | $ (477.1) | $ (11.0) | $ 56.6

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