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Other Comprehensive Income/Loss (Tables) | 9 Months Ended
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Sep. 30, 2024
Equity [Abstract] |
Schedule of Other Comprehensive Income and Related Tax Effects | The gross amounts of each component of other comprehensive loss and the related tax effects are as follows:
| Pre-tax |  | Tax (Expense) Benefit |  | Net of Tax
Three Months Ended September 30, | 2024 | 2023 |  | 2024 | 2023 |  | 2024 | 2023
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized gains (losses) during the period | $ | 158.5 |  | $ | (72.1) |  |  | $ | (39.4) |  | $ | 17.9 |  |  | $ | 119.1 |  | $ | (54.2) |
Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity | (0.2) |  | (0.3) |  |  | — |  | 0.1 |  |  | (0.2) |  | (0.2) |
Cash flow hedge: |  |  |  |  |  |  |  |
Change in unrealized gains (losses) on derivatives | 12.4 |  | (13.1) |  |  | (3.0) |  | 3.2 |  |  | 9.4 |  | (9.9) |
Reclassification adjustment for derivatives net losses included in income | 3.1 |  | 2.1 |  |  | (0.8) |  | (0.5) |  |  | 2.3 |  | 1.6 |
Total other comprehensive income (loss) | $ | 173.8 |  | $ | (83.4) |  |  | $ | (43.2) |  | $ | 20.7 |  |  | $ | 130.6 |  | $ | (62.7) |
| Pre-tax |  | Tax (Expense) Benefit |  | Net of Tax
Nine Months Ended September 30, | 2024 | 2023 |  | 2024 | 2023 |  | 2024 | 2023
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized gains (losses) during the period | $ | 134.6 |  | $ | (51.4) |  |  | $ | (33.5) |  | $ | 12.7 |  |  | $ | 101.1 |  | $ | (38.7) |
Reclassification adjustment for net losses included in income | — |  | 23.5 |  |  | — |  | (5.8) |  |  | — |  | 17.7 |
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale | — |  | (7.2) |  |  | — |  | 1.8 |  |  | — |  | (5.4) |
Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity | (0.5) |  | (1.1) |  |  | — |  | 0.3 |  |  | (0.5) |  | (0.8) |
Cash flow hedge: |  |  |  |  |  |  |  |
Change in unrealized gains on derivatives | (10.1) |  | (27.2) |  |  | 2.8 |  | 6.7 |  |  | (7.3) |  | (20.5) |
Reclassification adjustment for derivatives net losses included in income | 11.2 |  | 4.1 |  |  | (2.9) |  | (1.0) |  |  | 8.3 |  | 3.1 |
Total other comprehensive income (loss) | $ | 135.2 |  | $ | (59.3) |  |  | $ | (33.6) |  | $ | 14.7 |  |  | $ | 101.6 |  | $ | (44.6) |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| September 30, 2024 |  | December 31, 2023
Net unrealized loss on investment securities available-for-sale | $ | (249.0) |  |  | $ | (350.1) |
Net unrealized loss on investment securities transferred to held-to-maturity | (5.9) |  |  | (5.6) |
Net unrealized loss on derivatives | — |  |  | (0.8) |
Net accumulated other comprehensive loss | $ | (254.9) |  |  | $ | (356.5) |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1 + Details
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