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Other Comprehensive Income/Loss (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of 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, | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains during period | $ | (23.7 | ) |  | $ | 9.3 |  |  | $ | (6.2 | ) |  | $ | 3.7 |  |  | $ | (17.5 | ) |  | $ | 5.6 |
Change in unamortized loss on available- for-sale securities transferred into held-to- maturity | 0.5 |  |  | 0.5 |  |  | 0.2 |  |  | 0.2 |  |  | 0.3 |  |  | 0.3 |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial (gain) loss | (0.1 | ) |  | (0.7 | ) |  | (0.1 | ) |  | (0.3 | ) |  | — |  |  | (0.4 | )
Total other comprehensive income | $ | (23.3 | ) |  | $ | 9.1 |  |  | $ | (6.1 | ) |  | $ | 3.6 |  |  | $ | (17.2 | ) |  | $ | 5.5 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| March 31, 2018 |  | December 31, 2017
Net unrealized gain (loss) on investment securities available-for-sale | $ | (33.5 | ) |  | $ | (13.3 | )
Net unrealized gain (loss) on derivatives | — |  |  | 1.3 |
Net actuarial gain (loss) on defined benefit post-retirement benefit plans | 1.2 |  |  | — |
Net accumulated other comprehensive gain (loss) | $ | (32.3 | ) |  | $ | (12.0 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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