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Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | $ 3,225.3 | $ 3,121.2 | $ 3,225.3 | $ 3,121.2 | $ 3,227.5 | $ 3,209.7 | $ 3,160.3 | $ 3,073.8
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax |  |  | 0.0 | (5.4) |  |  |  |
Change in net unrealized gain during period, pre-tax | 2.5 | (57.5) | (23.9) | 20.7 |  |  |  |
Change in net unrealized gain during period, tax expense (benefit) | (0.7) | 14.4 | 5.9 | (5.2) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | 1.8 | (43.1) | (18.0) | 15.5 |  |  |  |
Reclassification adjustment for net losses included in income | 0.0 | 0.1 | 0.0 | 23.5 |  |  |  |
Reclassification adjustment for net gains included in income, tax expense (benefit) | 0.0 | 0.0 | 0.0 | 5.8 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 0.1 | 0.0 | 17.7 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax | (0.1) | (0.4) | (0.3) | (0.8) |  |  |  |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | 0.0 | (0.1) | 0.0 | (0.2) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax | (0.1) | (0.3) | (0.3) | (0.6) |  |  |  |
Unrealized loss on derivatives, tax expense (benefit) | 1.2 | 0.4 | 2.1 | 0.5 |  |  |  |
Other comprehensive income (loss), before tax | 1.9 | (79.9) | (38.6) | 24.1 |  |  |  |
Other Comprehensive Income (Loss), tax expense (benefit) | 0.5 | (20.0) | (9.6) | 6.0 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 1.4 | (59.9) | (29.0) | 18.1 |  |  |  |
Net unrealized loss on investment securities available-for-sale |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | (368.1) |  | (368.1) |  | (350.1) |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax |  |  | (5.8) |  | (5.6) |  |  |
Net unrealized loss on derivatives |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Net unrealized gain (loss) on derivatives |  |  | (11.6) |  | (0.8) |  |  |
Net accumulated other comprehensive loss |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | $ (385.5) | $ (459.0) | $ (385.5) | $ (459.0) | $ (356.5) | $ (386.9) | $ (399.1) | $ (477.1)

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