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Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized gain during period, pre-tax | $ 44.7 | $ 2.5 | $ 115.4 | $ (23.9) |  |  |  |
Change in net unrealized gain during period, tax expense (benefit) | (11.1) | (0.7) | (28.8) | 5.9 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | 33.6 | 1.8 | 86.6 | (18.0) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax | (0.1) | (0.1) | (0.1) | (0.3) |  |  |  |
Unrealized loss on derivatives, tax expense (benefit) | (0.1) | (1.2) | (0.4) | (2.1) |  |  |  |
Unrealized loss on derivatives, net of tax | 0.8 | (3.7) | 1.5 | (16.7) |  |  |  |
Other comprehensive income (loss), before tax | 45.9 | 1.9 | 118.6 | (38.6) |  |  |  |
Other Comprehensive Income (Loss), tax expense (benefit) | (11.3) | (0.5) | (29.6) | 9.6 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 34.6 | 1.4 | 89.0 | (29.0) |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 0.9 | (5.1) | 1.9 | (22.5) |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 0.4 | 4.6 | 1.4 | 8.1 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 0.3 | 3.4 | 1.0 | 6.0 |  |  |  |
Total stockholders’ equity | 3,421.8 | 3,225.3 | 3,421.8 | 3,225.3 | $ 3,361.3 | $ 3,304.0 | $ 3,209.7 | $ 3,227.5
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax | (0.1) | (0.1) | (0.1) | (0.3) |  |  |  |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax | $ (0.1) | $ 1.4 | $ (0.4) | $ 5.8 |  |  |  |

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