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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Oct. 31, 2011
Esurance
Dec. 31, 2011
AutoOne
Dec. 31, 2011
Discontinued Operations.
Dec. 31, 2010
Discontinued Operations.
Dec. 31, 2011
Sirius group
Dec. 31, 2010
Sirius group
Discontinued Operations                    
Gain (loss) on sale of discontinued operation, pre-tax           $ 29.6        
Gain (loss) on sale of discontinued operation, net of tax         677.5 19.2        
Assets held for sale                    
Fixed maturity investments, at fair value 6,221.9 5,786.1         111.8 593.8    
Short-term investments, at amortized cost (which approximates fair value) 846.0 975.3           131.0    
Common equity securities, at fair value 755.0 667.0           43.0    
Convertible fixed maturity investments, at fair value 143.8 143.0           17.2    
Other long-term investments 301.3 372.1           4.0    
Total investments 8,268.0 7,943.5         111.8 789.0 3,640.5 4,116.2
Cash 705.4 395.0         5.5 39.8    
Reinsurance recoverable on paid and unpaid losses 2,537.8 2,407.1           34.4 353.7 469.4
Insurance premiums receivable 489.2 532.5         8.8 102.9    
Deferred acquisition costs 187.0 176.1         2.2 34.7    
Deferred tax asset 630.6 535.9         1.9 67.8    
Other assets 681.9 730.0         2.4 54.2    
Total assets 14,064.0 14,534.1         132.6 1,122.8 5,337.9 5,618.7
Liabilities held for sale                    
Loss and loss adjustment expense reserves 5,702.3 5,736.8 6,379.2 7,029.4     64.7 450.4 2,343.7 2,441.3
Unearned insurance premiums 846.9 938.7         34.1 201.6    
Accrued incentive compensation 187.9 157.4           19.1    
Other liabilities 534.1 557.5         8.8 80.4    
Total liabilities 9,396.1 10,273.3         107.6 751.5 3,784.1 3,863.0
Net assets held for sale           $ 25.0 $ 25.0 $ 371.3