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Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Investment securities available-for sale: |  |
Change in net unrealized gain during period, pre-tax | $ 39.2 | $ 33.6
Change in net unrealized gain during period, tax expense (benefit) | 10.3 | 8.8
Change in net unrealized gain during period, net of tax | 28.9 | 24.8
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, pre-tax | 0.0 | (6.0)
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, tax expense (benefit) | 0.0 | (1.6)
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, net of tax | 0.0 | (4.4)
Defined benefits post-retirement benefit plan: |  |
Change in net actuarial (gain) loss, pre-tax | (0.2) | (0.2)
Change in net actuarial (gain) loss, tax expense (benefit) | (0.1) |
Change in net actuarial (gain) loss, net of tax | (0.1) | (0.2)
Other comprehensive income, before tax | 39.0 | 27.4
Total other comprehensive income, tax expense (benefit) | 10.2 | 7.2
Total other comprehensive income, net of tax amount | $ 28.8 | $ 20.2

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