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Significant Transactions (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 78 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Oct. 31, 2011
Esurance
Significant Transactions            
Stock Repurchased and Retired During Period, Value $ 5.2 $ 7.2 $ 81.2 $ 93.2 $ 619.0  
Consideration in excess of tangible book value           700
Gain on sale of business in discontinued operations           677.5
Net income from discontinued operations, net of tax $ 0 $ (1.5) $ 0.1 $ 1.0