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v3.21.2

Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Investment securities available-for sale: |  |  |  |  |
Change in net unrealized gain during period, pre-tax | $ (13.4) | $ (4.2) | $ (81.0) | $ 69.9 |
Change in net unrealized gain during period, tax expense (benefit) | (3.3) | (1.1) | (20.5) | 18.7 |
Change in net unrealized gain during period, net of tax | (10.1) | (3.1) | (60.5) | 51.2 |
Reclassification adjustment for net gains included in income, pre-tax | (0.3) | (0.1) | (0.2) | (0.1) |
Reclassification adjustment for net gains included in income, tax expense (benefit) | (0.1) | 0.0 | (0.1) | 0.0 |
Reclassification adjustment for net gains included in income, net of tax | (0.2) | (0.1) | (0.1) | (0.1) |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, pre-tax | (2.5) | 0.0 | 22.3 | 0.0 |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | (0.6) | 0.0 | 5.7 | 0.0 |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, net of tax | (1.9) | 0.0 | 16.6 | 0.0 |
Unrealized loss on derivatives, pre-tax | 3.2 | 0.0 | 2.3 | 0.2 |
Unrealized loss on derivatives, tax expense (benefit) | 0.8 | 0.0 | 0.6 | 0.0 |
Unrealized loss on derivatives, net of tax | 2.4 | 0.0 | 1.7 | 0.2 | $ (0.2)
Defined benefits post-retirement benefit plan: |  |  |  |  |
Change in net actuarial (gain) loss, pre-tax | 0.0 | (0.1) | 0.0 | (0.5) |
Change in net actuarial (gain) loss, tax expense (benefit) | 0.0 |  | 0.0 | (0.1) |
Change in net actuarial (gain) loss, net of tax | 0.0 | (0.1) | 0.0 | (0.4) |
Other comprehensive income (loss), before tax | (13.0) | (4.4) | (56.6) | 69.5 |
Other Comprehensive Income (Loss), tax expense (benefit) | (3.2) | (1.1) | (14.3) | 18.6 |
Other Comprehensive Income (Loss), Net of Tax | $ (9.8) | $ (3.3) | $ (42.3) | $ 50.9 |

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