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Discontinued Operations (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues    
Earned insurance premiums $ 499.0 $ 467.8
Net investment income 41.8 49.5
Net realized and unrealized investment gains 58.6 (9.2)
Other revenue 31.2 21.5
Total revenues 630.6 529.6
Expenses    
Loss and loss adjustment expenses 262.7 358.4
Insurance and reinsurance acquisition expenses 108.4 90.7
Other underwriting expenses 74.8 73.1
General and administrative expenses 45.5 28.0
Total expenses 502.3 563.3
Income from discontinued operations 0.1 2.5
Discontinued Operations.
    
Revenues    
Earned insurance premiums 7.8 227.7
Net investment income   4.0
Net realized and unrealized investment gains   3.4
Other revenue   17.7
Total revenues 7.8 252.8
Expenses    
Loss and loss adjustment expenses 6.7 168.1
Insurance and reinsurance acquisition expenses 1.0 49.5
Other underwriting expenses 0.2 21.5
General and administrative expenses   12.5
Total expenses 7.9 251.6
Pre-tax (loss) income (0.1) 1.2
Discontinued Operation, Tax Effect of Discontinued Operation 0.2 1.3
Income from discontinued operations $ 0.1 $ 2.5