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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | The gross amounts of each component of other comprehensive (loss) income and the related tax effects for the periods indicated are as follows:
Year Ended December 31, 2022 | Before Tax Amount | Tax Expense (Benefit) | Net of Tax Amount
Investment securities available-for sale: |  |  |
Change in net unrealized loss during period | $ | (613.1) |  | $ | (152.4) |  | $ | (460.7) |
Reclassification adjustment for net gains included in net income | 24.4 |  | 5.5 |  | 18.9 |
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale | 0.2 |  | 0.1 |  | 0.1 |
Net change in unamortized gains on available-for-sale securities transferred into held-to-maturity | (26.1) |  | (6.6) |  | (19.5) |
Change in net unrealized loss on derivatives | (6.7) |  | (1.8) |  | (4.9) |
Total other comprehensive loss | $ | (621.3) |  | $ | (155.2) |  | $ | (466.1) |
Year Ended December 31, 2021 | Before Tax Amount | Tax Expense (Benefit) | Net of Tax Amount
Investment securities available-for sale: |  |  |
Change in net unrealized loss during period | $ | (113.7) |  | $ | (28.7) |  | $ | (85.0) |
Reclassification adjustment for net gains included in net income | (1.1) |  | (0.3) |  | (0.8) |
Net change in unamortized gains on available-for-sale securities transferred into held-to-maturity | 20.2 |  | 5.1 |  | 15.1 |
Change in net unrealized loss on derivatives | 4.2 |  | 1.1 |  | 3.1 |
Total other comprehensive loss | $ | (90.4) |  | $ | (22.8) |  | $ | (67.6) |
Year Ended December 31, 2020 | Before Tax Amount | Tax Expense (Benefit) | Net of Tax Amount
Investment securities available-for sale: |  |  |
Change in net unrealized gains during period | $ | 61.8 |  | $ | 15.8 |  | $ | 46.0 |
Reclassification adjustment for net gains included in net income | (0.3) |  | (0.1) |  | (0.2) |
Change in net unrealized loss on derivatives | 0.2 |  | — |  | 0.2 |
Defined benefits post-retirement benefit plan: |  |  |
Change in net actuarial gains | (0.5) |  | (0.1) |  | (0.4) |
Total other comprehensive income | $ | 61.2 |  | $ | 15.6 |  | $ | 45.6 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss, net of income taxes, are as follows:
Years ended December 31, | 2022 |  | 2021
Net unrealized loss on investment securities available-for-sale | $ | (471.0) |  |  | $ | (29.0) |
Net unrealized (loss) gain on investment securities transferred to held-to-maturity | (4.5) |  |  | 15.0 |
Net unrealized (loss) gain on derivatives | (1.6) |  |  | 3.0 |
Net accumulated other comprehensive loss | $ | (477.1) |  |  | $ | (11.0) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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