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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
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]                      
Statutory Federal Income Tax Expense                 $ (1.2) $ (35.1) $ (56.1)
Statutory Federal Income Tax Expense, Rate, percentage                 35.00% 35.00% 35.00%
Tax-exempt Income and Dividends Received Deduction                 $ 9.8 $ 9.8 $ 9.0
Tax-exempt Income and Dividends Received Deduction, Rate, percentage                 (279.50%) (9.70%) (5.60%)
Effective Income Tax Rate Reconciliation, Unrecognized Tax Benefit (Expense), Amount                 $ 0.0 $ 2.1 $ (0.3)
Effective Income Tax Rate Reconciliation, Unrecognized Tax Benefit (Expense), Percent                 (0.00%) (2.10%) (0.00%)
Effective Income Tax Rate Reconciliation, Indemnification Recoveries, Amount                 $ 0.2 $ 3.7 $ 0.0
Effective Income Tax Rate Reconciliation, Indemnification Recoveries, Percent                 (6.50%) (3.60%) (0.00%)
State Income Taxes                 $ (0.6) $ (0.6) $ (0.6)
State Income Taxes, Percentage                 16.90% 0.50% 0.40%
Other, Net                 $ 1.0 $ 0.0 $ 0.4
Other, Net, Rate, percentage                 (28.90%) 0.00% (0.10%)
Income Tax Expense $ (11.5) $ 14.9 $ 1.5 $ 4.3 $ 2.9 $ (11.8) $ (6.9) $ (4.3) $ 9.2 $ (20.1) $ (47.6)
Effective Income Tax Expense, Rate, percentage                 (263.00%) 20.10% 29.70%