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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 41.7 | $ 21.8 | $ 78.4 | $ 45.0
Other comprehensive income, before tax: |  |  |  |
Change in net unrealized (losses) gains during period | (3.8) | 8.0 | (27.6) | 17.4
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity | 0.5 | 0.5 | 1.0 | 0.9
Defined benefit post-retirement benefits plans: |  |  |  |
Change in net actuarial gain | (0.2) | (0.2) | (0.3) | (0.9)
Other comprehensive income (loss), before tax | (3.5) | 7.8 | (26.9) | 16.9
Deferred tax benefit (expense) related to other comprehensive income | 0.9 | (3.2) | 7.0 | (6.8)
Other comprehensive (loss) income, net of tax | (2.6) | 4.6 | (19.9) | 10.1
Comprehensive income, net of tax | 39.1 | 26.4 | 58.5 | 55.1
Unrealized Gain (Loss) on Derivatives | $ 0.0 | $ (0.5) | $ 0.0 | $ (0.5)

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