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Other Comprehensive Income/Loss (Tables) | 6 Months Ended | 9 Months Ended
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Jun. 30, 2021 | Sep. 30, 2021
Equity [Abstract] |  |
Schedule of Other Comprehensive Income and Related Tax Effects |  | The gross amounts of each component of other comprehensive income and the related tax effects are as follows:
| Pre-tax |  | Tax Expense (Benefit) |  | Net of Tax
Three Months Ended September 30, | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized loss during period | $ | (13.4) |  |  | $ | (4.2) |  |  | $ | (3.3) |  |  | $ | (1.1) |  |  | $ | (10.1) |  |  | $ | (3.1) |
Reclassification adjustment for net gain included in net income | (0.3) |  |  | (0.1) |  |  | (0.1) |  |  | — |  |  | (0.2) |  |  | (0.1) |
Net change in unamortized gains on available-for-sale securities transferred into held-to-maturity | (2.5) |  |  | — |  |  | (0.6) |  |  | — |  |  | (1.9) |  |  | — |
Unrealized loss on derivatives | 3.2 |  |  | — |  |  | 0.8 |  |  | — |  |  | 2.4 |  |  | — |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial gains | — |  |  | (0.1) |  |  | — |  |  | — |  |  | — |  |  | (0.1) |
Total other comprehensive (loss) income | $ | (13.0) |  |  | $ | (4.4) |  |  | $ | (3.2) |  |  | $ | (1.1) |  |  | $ | (9.8) |  |  | $ | (3.3) |
| Pre-tax |  | Tax Expense (Benefit) |  | Net of Tax
Nine Months Ended September 30, | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized (loss) gains during period | $ | (81.0) |  |  | $ | 69.9 |  |  | $ | (20.5) |  |  | $ | 18.7 |  |  | $ | (60.5) |  |  | $ | 51.2 |
Reclassification adjustment for net gain included in net income | (0.2) |  |  | (0.1) |  |  | (0.1) |  |  | — |  |  | (0.1) |  |  | (0.1) |
Net change in unamortized gains on available-for-sale securities transferred into held-to-maturity | 22.3 |  |  | — |  |  | 5.7 |  |  | — |  |  | 16.6 |  |  | — |
Unrealized loss on derivatives | 2.3 |  |  | 0.2 |  |  | 0.6 |  |  | — |  |  | 1.7 |  |  | 0.2 |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial gains | — |  |  | (0.5) |  |  | — |  |  | (0.1) |  |  | — |  |  | (0.4) |
Total other comprehensive (loss) income | $ | (56.6) |  |  | $ | 69.5 |  |  | $ | (14.3) |  |  | $ | 18.6 |  |  | $ | (42.3) |  |  | $ | 50.9 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income, net of related tax effects, are as follows:
| September 30, 2021 |  | December 31, 2020
Net unrealized (loss) gain on investment securities available-for-sale | $ | (4.0) |  |  | $ | 56.8 |
Net unrealized gain on investment securities transferred to held-to-maturity | 16.6 |  |  | — |
Net unrealized gain (loss) on derivatives | 1.7 |  |  | (0.2) |
Net accumulated other comprehensive gains | $ | 14.3 |  |  | $ | 56.6 |

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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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