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Business Segments - Segment Operating Profit (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
Segment Reporting Information [Line Items]                      
Operating Income (Loss)                 $ 3.1 $ 84.5 $ 136.3
Net Realized Gains on Sales of Investments $ 9.1 $ 11.6 $ 5.6 $ 6.8 $ 9.4 $ 5.3 $ 34.0 $ 3.4 33.1 52.1 39.1
Net Impairment Losses Recognized in Earnings (8.7) (8.3) (6.4) (9.3) (14.7) (3.3) (2.2) (7.0) (32.7) (27.2) (15.2)
Loss from Early Extinguishment of Debt         0.0 0.0 0.0 9.1 0.0 9.1 0.0
Income (Loss) from Continuing Operations before Income Taxes $ 40.6 $ (33.2) $ 2.6 $ (6.5) $ (1.6) $ 49.8 $ 34.3 $ 17.8 3.5 100.3 160.2
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Operating Income (Loss)                 28.5 133.4 169.0
Operating Segments [Member] | Property and Casualty Insurance [Member]                      
Segment Reporting Information [Line Items]                      
Operating Income (Loss)                 (17.2) 23.7 27.1
Operating Segments [Member] | Life and Health Insurance [Member]                      
Segment Reporting Information [Line Items]                      
Operating Income (Loss)                 45.7 109.7 141.9
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Operating Income (Loss)                 (25.4) (48.9) (32.7)
Segment Reconciling Items [Member]                      
Segment Reporting Information [Line Items]                      
Net Realized Gains on Sales of Investments                 33.1 52.1 39.1
Net Impairment Losses Recognized in Earnings                 (32.7) (27.2) (15.2)
Loss from Early Extinguishment of Debt                 $ 0.0 $ (9.1) $ 0.0