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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | $ 3,121.2 | $ 3,271.9 | $ 3,121.2 | $ 3,271.9 | $ 3,073.8 | $ 3,160.3 | $ 3,441.1 | $ 1,986.6
Net unrealized gain (loss) on derivatives | (16.6) | (10.8) | (9.1) | 5.2 |  |  |  |
Change in net unrealized gain during period, pre-tax | (57.5) | (161.6) | 20.7 | (414.2) |  |  |  |
Change in net unrealized gain during period, tax expense (benefit) | (14.4) | (45.2) | 5.2 | (107.9) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (43.1) | (116.4) | 15.5 | (306.3) |  |  |  |
Reclassification adjustment for net losses included in income | 0.1 | 0.1 | 23.5 | 0.2 |  |  |  |
Reclassification adjustment for net gains included in income, tax expense (benefit) | 0.0 | 0.0 | 5.8 | 0.0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.1 | 0.1 | 17.7 | 0.2 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax | (0.4) | (0.9) | (0.8) | (23.9) |  |  |  |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | (0.1) | (0.2) | (0.2) | (5.9) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax | (0.3) | (0.7) | (0.6) | (18.0) |  |  |  |
Unrealized loss on derivatives, pre-tax | (22.1) | (15.0) | (12.1) | 6.3 |  |  |  |
Unrealized loss on derivatives, tax expense (benefit) | (5.5) | (4.2) | (3.0) | 1.1 |  |  |  |
Other comprehensive (loss) income, before tax | (79.9) | (177.4) | 24.1 | (431.4) |  |  |  |
Other Comprehensive Income (Loss), tax expense (benefit) | (20.0) | (49.6) | 6.0 | (112.6) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (59.9) | (127.8) | 18.1 | (318.8) |  |  |  |
Net unrealized loss on investment securities available-for-sale |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | (443.2) |  | (443.2) |  | (471.0) |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax |  |  | (5.2) |  | (4.5) |  |  |
Net unrealized loss on derivatives |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Net unrealized gain (loss) on derivatives |  |  | (10.6) |  | (1.6) |  |  |
Net accumulated other comprehensive loss |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | $ (459.0) | $ (329.8) | $ (459.0) | $ (329.8) | $ (477.1) | $ (399.1) | $ (202.0) | $ (11.0)

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