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Income Taxes - Statutory Federal Income Tax Expense, Effective Income Tax Expense, Rates (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory Federal Income Tax Expense |  |  |  |  |  |  |  |  | $ (41.8) | $ (56.4) | $ (1.2)
Statutory Federal Income Tax Expense, Rate, percentage |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
Tax-exempt Income and Dividends Received Deduction |  |  |  |  |  |  |  |  | $ 4.8 | $ 9.8 | $ 9.8
Tax-exempt Income and Dividends Received Deduction, Rate, percentage |  |  |  |  |  |  |  |  | (2.40%) | (6.00%) | (279.50%)
Effective Income Tax Rate Reconciliation, Indemnification Recoveries, Amount |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.2
Effective Income Tax Rate Reconciliation, Indemnification Recoveries, Percent |  |  |  |  |  |  |  |  | (0.00%) | (0.00%) | (6.50%)
State Income Taxes |  |  |  |  |  |  |  |  | $ (0.1) | $ 0.1 | $ (0.6)
State Income Taxes, Percentage |  |  |  |  |  |  |  |  | 0.10% | (0.10%) | 16.90%
Change in Enacted Tax Rate, Amount |  |  |  |  |  |  |  |  | $ (26.4) | $ (7.4) | $ 0.0
Change in Enacted Tax Rate, Percent |  |  |  |  |  |  |  |  | (13.30%) | (4.60%) | 0.00%
Other, Net |  |  |  |  |  |  |  |  | $ 0.0 | $ (2.1) | $ 1.0
Other, Net, Percent |  |  |  |  |  |  |  |  | 0.00% | 1.30% | (28.90%)
Income Tax Expense | $ (1.1) | $ 11.8 | $ (8.0) | $ (13.4) | $ (8.3) | $ (20.5) | $ (15.5) | $ 3.1 | $ (10.7) | $ (41.2) | $ 9.2
Effective Income Tax Expense, Rate, percentage |  |  |  |  |  |  |  |  | 5.40% | 25.60% | (263.00%)

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