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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 41.4 | $ 27.3 | $ 119.8 | $ 72.3
Other comprehensive income, before tax: |  |  |  |
Change in net unrealized (losses) gains during period | (6.3) | (1.8) | (33.9) | 15.6
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity | 0.5 | 0.5 | 1.5 | 1.4
Defined benefit post-retirement benefits plans: |  |  |  |
Change in net actuarial gain | (0.2) | (0.2) | (0.5) | (1.1)
Other comprehensive income (loss), before tax | (6.0) | (1.8) | (32.9) | 15.1
Deferred tax benefit (expense) related to other comprehensive income | 1.6 | 0.8 | 8.6 | (6.0)
Other comprehensive (loss) income, net of tax | (4.4) | (1.0) | (24.3) | 9.1
Comprehensive income, net of tax | 37.0 | 26.3 | 95.5 | 81.4
Unrealized Gain (Loss) on Derivatives | $ 0.0 | $ (0.6) | $ 0.0 | $ (1.1)

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