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Other Comprehensive Income - Schedule of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Tax | $ 12.4 | $ 12.4 | $ (3.3) | $ (2.8)
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Net Of Tax |  |  | 1.2 | 1.2
Other Comprehensive Income (Loss), Net of Tax | 35.6 |  | (9.5) |
Before Tax Amount |  |  |  |
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)
Change in net unrealized loss on derivatives |  |  |  | (1.1)
Reclassification adjustment for derivative net (gains) losses included in net income |  | 0.0 | 0.0 | 1.1
Change in net actuarial gains |  | (0.8) | (0.6) | (1.3)
Total other comprehensive income |  |  |  | (6.6)
Tax Expense (Benefit) |  |  |  |
Change in net unrealized loss during period |  | 14.1 | (3.6) | (2.7)
Reclassification adjustment for net loss included in net income |  | 0.0 | 0.0 | (0.3)
Change in net unrealized loss on derivatives |  |  |  | (0.4)
Change in net actuarial gains |  | (0.1) | (0.1) | (0.5)
Total other comprehensive income (loss) |  |  |  | (2.8)
Net of Tax Amount |  |  |  |
Change in net unrealized loss during period |  | 40.8 | (10.3) | (3.8)
Reclassification adjustment for net gain included in net income |  | (0.1) | 0.1 | (0.4)
Change in net unrealized loss on derivatives |  |  |  | (0.7)
Change in net actuarial loss |  | (0.7) | (0.5) | (0.8)
Other comprehensive income (loss), net of tax |  | 35.6 | (9.5) | (3.8)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  | 0.4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  |  | 0.7
Other comprehensive income (loss), before tax | $ 48.0 | 48.0 | (12.8) | (6.6)
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Before Tax |  | 281.1 | 1.6 | 1.9
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Tax |  |  | 0.4 | 0.7
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity |  | (6.0) | $ 0.0 | $ 0.0
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax |  | (1.6) |  |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax |  | $ (4.4) |  |

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