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v3.24.0.1

Other Comprehensive Income - Schedule of Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity [Abstract] |  |  |  |
Other comprehensive income (loss), before tax | $ 160.7 | $ (621.3) | $ (90.4) |
Other Comprehensive Income (Loss), Tax | 40.1 | (155.2) | (22.8) |
Other Comprehensive Income (Loss), Net of Tax | 120.6 | (466.1) | (67.6) |
Before Tax Amount |  |  |  |
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) |
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale | (7.2) | 0.2 | 0.0 |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax | (1.3) | (26.1) | 20.2 |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0.6 | (4.9) | 3.1 |
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax | 0.9 | (6.7) | 4.2 |
Tax Expense (Benefit) |  |  |  |
Change in net unrealized loss during period | 36.1 | (152.4) | (28.7) |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax | (0.3) | (6.6) | 5.1 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax | 0.3 | (1.8) | 1.1 |
Reclassification adjustment for net losses included in net income | 5.8 | 5.5 | (0.3) |
Net of Tax Amount |  |  |  |
Change in net unrealized loss during period | 108.7 | (460.7) | (85.0) |
Reclassification adjustment for net gains included in net income | 17.7 | 18.9 | (0.8) |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax | (1.0) | (19.5) | 15.1 |
Stockholders' Equity Attributable to Parent | 3,227.5 | 3,073.8 | $ 1,986.6 | $ 1,959.8
Net change in unamortized (losses) gains on available-for-sale investment securities transferred into held-to-maturity | (7.2) | 0.2 |  |
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Tax | (1.8) | 0.1 |  |
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Net Of Tax | $ (5.4) | $ 0.1 |  |

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