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Significant Transactions (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Oct. 31, 2011
Esurance
Significant Transactions      
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 $ 2.5