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Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total stockholders’ equity | $ 3,209.7 | $ 3,160.3 | $ 3,227.5 | $ 3,073.8
Net unrealized gain (loss) on derivatives | (10.4) | 7.5 |  |
Change in net unrealized gain during period, pre-tax | (26.4) | 78.2 |  |
Change in net unrealized gain during period, tax expense (benefit) | (6.6) | 19.6 |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (19.8) | 58.6 |  |
Reclassification adjustment for net losses included in income | 0.0 | 23.4 |  |
Reclassification adjustment for net gains included in income, tax expense (benefit) | 0.0 | 5.8 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 17.6 |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax | (0.2) | (0.4) |  |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | 0.0 | (0.1) |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax | (0.2) | (0.3) |  |
Unrealized loss on derivatives, pre-tax | (13.9) | 10.0 |  |
Unrealized loss on derivatives, tax expense (benefit) | (3.5) | 2.5 |  |
Other comprehensive (loss) income, before tax | (40.5) | 104.0 |  |
Other Comprehensive Income (Loss), tax expense (benefit) | (10.1) | 26.0 |  |
Other Comprehensive Income (Loss), Net of Tax | (30.4) | 78.0 |  |
Net unrealized loss on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total stockholders’ equity | (369.9) |  | (350.1) |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax | (5.7) |  | (5.6) |
Net unrealized loss on derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized gain (loss) on derivatives | (11.3) |  | (0.8) |
Net accumulated other comprehensive loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total stockholders’ equity | $ (386.9) | $ (399.1) | $ (356.5) | $ (477.1)

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