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Other Comprehensive Income/Loss (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, | 2024 | 2023 |  | 2024 | 2023 |  | 2024 | 2023
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized (losses) gains during the period | $ | (26.4) |  | $ | 78.2 |  |  | $ | (6.6) |  | $ | 19.6 |  |  | $ | (19.8) |  | $ | 58.6 |
Reclassification adjustment for net losses included in income | — |  | 23.4 |  |  | — |  | 5.8 |  |  | — |  | 17.6 |
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 | (0.2) |  | (0.4) |  |  | — |  | (0.1) |  |  | (0.2) |  | (0.3) |
Change in unrealized (gains) losses on derivatives | (13.9) |  | 10.0 |  |  | (3.5) |  | 2.5 |  |  | (10.4) |  | 7.5 |
Total other comprehensive (loss) income | $ | (40.5) |  | $ | 104.0 |  |  | $ | (10.1) |  | $ | 26.0 |  |  | $ | (30.4) |  | $ | 78.0 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| March 31, 2024 |  | December 31, 2023
Net unrealized loss on investment securities available-for-sale | $ | (369.9) |  |  | $ | (350.1) |
Net unrealized loss on investment securities transferred to held-to-maturity | (5.7) |  |  | (5.6) |
Net unrealized loss on derivatives | (11.3) |  |  | (0.8) |
Net accumulated other comprehensive loss | $ | (386.9) |  |  | $ | (356.5) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
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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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