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Discontinued Operations (Loss from Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Discontinued Operations
Dec. 31, 2011
Discontinued Operations
Dec. 31, 2010
Discontinued Operations
Oct. 31, 2011
Esurance
Dec. 31, 2012
Esurance
Dec. 31, 2011
Esurance
Dec. 31, 2010
Esurance
Dec. 31, 2012
Esurance
Discontinued Operations
Dec. 31, 2011
Esurance
Discontinued Operations
Dec. 31, 2010
Esurance
Discontinued Operations
Dec. 31, 2012
AutoOne
Discontinued Operations
Dec. 31, 2011
AutoOne
Discontinued Operations
Revenues                                              
Earned insurance premiums                 $ 2,063.6 $ 1,924.5 $ 2,029.0 $ 10.6 $ 731.2 $ 1,133.4                  
Net investment income                 153.6 184.5 208.9 0 12.0 19.6                  
Net realized and unrealized investment gains                 118.2 74.1 77.6 0 0.7 13.3                  
Other revenue                 100.3 (10.0) 18.2 0 55.1 71.1                  
Revenues (including realized gains and losses) 566.4 697.4 542.3 629.7 593.4 501.7 552.4 525.6 2,435.7 2,173.1 2,333.7 10.6 799.0 1,237.4                  
Expenses                                              
Loss and loss adjustment expenses                 1,193.9 1,174.3 1,216.6 48.4 574.9 851.4                  
Insurance and reinsurance acquisition expenses                 430.2 402.2 419.6 (2.1) 157.0 251.2                  
Other underwriting expenses                 321.8 268.1 295.9 1.7 91.4 124.9                  
General and administrative expenses                 182.2 175.3 155.0 0 38.3 48.7                  
Total expenses 617.2 562.3 504.7 488.8 495.0 500.5 516.6 563.0 2,172.9 2,075.1 2,144.4 48.0 861.6 1,276.2                  
Loss from discontinued operations                       (37.4) (62.6) (38.8)                  
Income tax benefit                       13.4 25.9 8.7                  
Net loss from other discontinued operations, net of tax 0.5 (106.8) 0.5 (9.2) 647.6 (30.1) (2.4) 6.5 (24.0) (36.7) (30.1) (24.0) (36.7) (30.1)                  
Gain (loss) on sale of discontinued operation, net of tax                       (91.0) (19.2) 0 677.5 0 677.5 0 0 677.5 0 0.5 (19.2)
Net (loss) income from discontinued operations                       $ (115.0) $ 621.6 $ (30.1)