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Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues [Abstract]                      
Earned Premiums $ 541.5 $ 536.7 $ 500.1 $ 431.3 $ 451.5 $ 462.8 $ 470.3 $ 477.6 $ 2,009.6 $ 1,862.2 $ 2,025.8
Net Investment Income 79.4 75.9 76.7 70.6 93.1 72.3 72.6 71.1 302.6 309.1 314.7
Other Income 1.4 0.8 0.6 0.9 0.6 0.5 0.2 0.1 3.7 1.4 0.8
Net Realized Gains on Sales of Investments 9.4 5.3 34.0 3.4 21.0 8.0 3.5 6.6 52.1 39.1 99.1
Other-than-temporary Impairment Losses:                      
Total Other-than-temporary Impairment Losses (14.9) (3.3) (2.2) (7.0) (6.5) (3.8) (4.1) (0.8) (27.4) (15.2) (15.8)
Portion of Losses Recognized in Other Comprehensive Income 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 1.9
Net Impairment Losses Recognized in Earnings (14.7) (3.3) (2.2) (7.0) (6.5) (3.8) (4.1) (0.8) (27.2) (15.2) (13.9)
Total Revenues 617.0 615.4 609.2 499.2 559.7 539.8 542.5 554.6 2,340.8 2,196.6 2,426.5
Expenses [Abstract]                      
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses 416.0 378.8 375.1 297.7 285.8 300.5 347.5 327.9 1,467.6 1,261.7 1,357.2
Insurance Expenses 177.0 161.1 162.1 144.9 156.4 158.6 161.3 152.1 645.1 628.4 654.4
Write-off of Long-lived Assets 0.0 0.0 11.1 0.0 0.0 54.6 0.0 0.0 11.1 54.6 0.0
Loss from Early Extinguishment of Debt 0.0 0.0 0.0 9.1         9.1 0.0 0.0
Interest and Other Expenses 25.6 25.7 26.6 29.7 24.4 22.1 22.5 22.7 107.6 91.7 100.5
Total Expenses 618.6 565.6 574.9 481.4 466.6 535.8 531.3 502.7 2,240.5 2,036.4 2,112.1
Income (Loss) from Continuing Operations before Income Taxes (1.6) 49.8 34.3 17.8 93.1 4.0 11.2 51.9 100.3 160.2 314.4
Income Tax Benefit (Expense) 2.9 (11.8) (6.9) (4.3) (29.8) 0.8 (1.9) (16.7) (20.1) (47.6) (99.9)
Income from Continuing Operations 1.3 38.0 27.4 13.5 63.3 4.8 9.3 35.2 80.2 112.6 214.5
Income from Discontinued Operations 3.3 (0.1) 2.3 0.0 2.1 (0.1) 0.0 (0.1) 5.5 1.9 3.2
Net Income $ 4.6 $ 37.9 $ 29.7 $ 13.5 $ 65.4 $ 4.7 $ 9.3 $ 35.1 $ 85.7 $ 114.5 $ 217.7
Income (Loss) from Continuing Operations Per Unrestricted Share [Abstract]                      
Income from Continuing Operations Per Unrestricted Share - Basic (usd pre share) $ 0.03 $ 0.73 $ 0.53 $ 0.26 $ 1.20 $ 0.09 $ 0.17 $ 0.63 $ 1.55 $ 2.08 $ 3.75
Income from Continuing Operations Per Unrestricted Share - Diluted (usd per share) 0.03 0.73 0.53 0.26 1.20 0.09 0.17 0.63 1.55 2.08 3.74
Net Income (Loss) Per Unrestricted Share [Abstract]                      
Net Income Per Unrestricted Share - Basic ( usd per share) 0.09 0.73 0.57 0.26 1.24 0.09 0.17 0.63 1.65 2.12 3.81
Net Income Per Unrestricted Share - Diluted (usd pre share) 0.09 0.73 0.57 0.26 1.24 0.09 0.17 0.63 1.65 2.12 3.80
Dividends Paid to Shareholders Per Share (usd per share) $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.96 $ 0.96 $ 0.96
Discontinued Operation, Tax Effect of Discontinued Operation                 $ 3.1 $ 1.1 $ 1.7