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Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Change in net unrealized gain during period | $ 54.9 | $ (13.9) | $ (6.5) |
Reclassification adjustment for net gain included in net income | (0.1) | 0.1 | $ (0.7) |
Accumulated other comprehensive income (loss) | 2,013.9 | 1,693.9 |  | $ 982.6
Net unrealized gain (loss) on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | 10.6 | (25.5) |  |
Total other comprehensive income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | 11.0 | (24.6) |  | $ (8.2)
Postretirement Healthcare Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), before tax, related to the Plan | 0.5 |  |  |
Postretirement Healthcare Plan | Net actuarial gain 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 | $ 0.4 | $ 0.9 |  |

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