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Other Comprehensive Income/Loss | 3 Months Ended
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Mar. 31, 2020
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 March 31, | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains during period | $ | 39.2 |  |  | $ | 33.6 |  |  | $ | 10.3 |  |  | $ | 8.8 |  |  | $ | 28.9 |  |  | $ | 24.8 |
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale | — |  |  | (6.0 | ) |  | — |  |  | (1.6 | ) |  | — |  |  | (4.4 | )
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial gains | (0.2 | ) |  | (0.2 | ) |  | (0.1 | ) |  | — |  |  | (0.1 | ) |  | (0.2 | )
Total other comprehensive income | $ | 39.0 |  |  | $ | 27.4 |  |  | $ | 10.2 |  |  | $ | 7.2 |  |  | $ | 28.8 |  |  | $ | 20.2 |
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| March 31, 2020 |  | December 31, 2019
Net unrealized gains on investment securities available-for-sale | $ | 39.6 |  |  | $ | 10.6 |
Net actuarial gains on defined benefit post-retirement benefit plans | 0.2 |  |  | 0.4 |
Net accumulated other comprehensive gains | $ | 39.8 |  |  | $ | 11.0 |

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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=120395209&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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