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Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Change in net unrealized loss during period | $ (13.9) | $ (6.5) | $ (19.4) |
Reclassification adjustment for net loss included in net income | 0.1 | (0.7) | (0.3) |
Accumulated other comprehensive income (loss) | 1,693.9 | 1,427.6 | 982.6 | $ 950.5
Net unrealized gain (loss) on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (25.5) | (13.3) |  |
Net actuarial gain (loss) on defined benefit post-retirement benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) |  | 1.3 |  |
Total other comprehensive income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (24.6) | $ (12.0) | $ (8.2) | $ 0.4
Postretirement Healthcare Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), before tax, related to the Plan | 1.2 |  |  |
Postretirement Healthcare Plan | Net actuarial gain (loss) on defined benefit post-retirement benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), before tax, related to the Plan | $ 0.9 |  |  |

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