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Other Comprehensive Income/Loss | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Other Comprehensive Income/Loss | Other Comprehensive Income/Loss 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 |
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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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