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Discontinued Operations (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues        
Earned insurance premiums $ 512.2 $ 478.3 $ 1,011.2 $ 946.1
Net investment income 40.4 45.8 82.2 95.3
Net realized and unrealized investment gains (8.1) 42.8 50.5 33.6
Other revenue (0.5) (13.3) 30.7 8.2
Total revenues 544.0 553.6 1,174.6 1,083.2
Expenses        
Loss and loss adjustment expenses 265.0 278.5 527.7 636.9
Insurance and reinsurance acquisition expenses 108.7 98.5 217.1 189.2
Other underwriting expenses 79.0 71.4 153.8 144.5
General and administrative expenses 42.1 56.2 87.6 84.2
Total expenses 505.7 517.5 1,008.0 1,080.8
Income from discontinued operations 0 (1.5) 0.1 1.0
Discontinued Operations.
        
Revenues        
Earned insurance premiums 0 237.2 7.8 464.9
Net investment income 0 4.0 0 8.0
Net realized and unrealized investment gains 0 4.4 0 7.8
Other revenue 0 17.2 0 34.9
Total revenues 0 262.8 7.8 515.6
Expenses        
Loss and loss adjustment expenses 0 170.1 6.7 338.2
Insurance and reinsurance acquisition expenses 0 53.6 1.0 103.1
Other underwriting expenses 0 22.5 0.2 44.0
General and administrative expenses 0 23.3 0 35.8
Total expenses 0 269.5 7.9 521.1
Pre-tax (loss) income 0 (6.7) (0.1) (5.5)
Discontinued Operation, Tax Effect of Discontinued Operation 0 5.2 0.2 6.5
Income from discontinued operations $ 0 $ (1.5) $ 0.1 $ 1.0