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Investment Securities (Details 6) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Investments, Debt and Equity Securities [Abstract]        
Fair value, investment-related liabilities $ 70.4 $ 68.1    
Investment securities        
Carrying value 5,248.7 6,221.9    
Total fixed maturity investments including assets held for sale   6,333.7    
Investments reclassified to assets held for sale   111.8    
AutoOne
       
Investment securities        
Investments reclassified to assets held for sale   111.8    
Fair Value
       
Investment securities        
Fair value investments 7,190.3 [1] 8,346.8 [1],[2] 7,493.9 [1] 7,901.6 [1]
Level 1 Inputs
       
Investment securities        
Fair value investments 1,769.9 1,879.1 1,667.8 1,894.4
Level 2 Inputs
       
Investment securities        
Fair value investments 5,006.4 6,088.2 5,330.6 5,477.4
Level 3 Inputs
       
Investment securities        
Fair value investments       0
Debt securities issued by corporations
       
Investment securities        
Fair value investments 2,340.6 2,135.1    
Carrying value 2,340.6 2,135.1    
Fixed maturity investments. | Level 3 Inputs
       
Investment securities        
Fair value investments 119.7 78.9 123.0 128.4
U.S. Government and agency obligations
       
Investment securities        
Carrying value 261.9 305.0    
Municipal obligations
       
Investment securities        
Carrying value 3.9 2.7    
Mortgage-backed and asset-backed securities
       
Investment securities        
Carrying value 2,009.0 3,222.9    
Mortgage-backed and asset-backed securities | Fair Value
       
Investment securities        
Fair value investments 2,009.0 3,222.9    
Mortgage-backed and asset-backed securities | Level 2 Inputs
       
Investment securities        
Fair value investments 1,959.4 3,207.8    
Mortgage-backed and asset-backed securities | Level 3 Inputs
       
Investment securities        
Fair value investments 49.6 15.1    
Non-cumulative perpetual preference shares
       
Investment securities        
Carrying value 86.8 78.8    
Common equity securities | Level 3 Inputs
       
Investment securities        
Fair value investments 35.8 32.3 74.5 71.2
Convertible fixed maturity investments | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0 0  
Other long-term investments | Level 3 Inputs
       
Investment securities        
Fair value investments 258.5 [1] 268.3 [1] 298.0 [1] 330.2 [1]
Fair value measured on a recurring basis | Fair Value
       
Investment securities        
Fair value investments 7,190.3 8,346.8    
Fair value measured on a recurring basis | Level 1 Inputs
       
Investment securities        
Fair value investments 1,769.9 1,879.1    
Fair value measured on a recurring basis | Level 2 Inputs
       
Investment securities        
Fair value investments 5,006.4 6,088.2    
Fair value measured on a recurring basis | Level 3 Inputs
       
Investment securities        
Fair value investments 414.0 379.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Fair Value
       
Investment securities        
Fair value investments 2,340.6 2,135.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 1 Inputs
       
Investment securities        
Fair value investments 2.0 3.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 2 Inputs
       
Investment securities        
Fair value investments 2,338.6 2,131.3    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Fair Value
       
Investment securities        
Fair value investments 756.4 790.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 2 Inputs
       
Investment securities        
Fair value investments 756.4 790.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Fair Value
       
Investment securities        
Fair value investments 430.1 359.4    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 2 Inputs
       
Investment securities        
Fair value investments 430.1 359.4    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Fair Value
       
Investment securities        
Fair value investments 307.1 239.6    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 1 Inputs
       
Investment securities        
Fair value investments 2.0 3.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 2 Inputs
       
Investment securities        
Fair value investments 305.1 235.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Fair Value
       
Investment securities        
Fair value investments 255.8 225.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 2 Inputs
       
Investment securities        
Fair value investments 255.8 225.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Fair Value
       
Investment securities        
Fair value investments 192.5 155.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 2 Inputs
       
Investment securities        
Fair value investments 192.5 155.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Basic materials | Fair Value
       
Investment securities        
Fair value investments 201.1 195.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Basic materials | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Basic materials | Level 2 Inputs
       
Investment securities        
Fair value investments 201.1 195.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Basic materials | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Fair Value
       
Investment securities        
Fair value investments 172.3 140.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 2 Inputs
       
Investment securities        
Fair value investments 172.3 140.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Fair Value
       
Investment securities        
Fair value investments 25.3 24.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 2 Inputs
       
Investment securities        
Fair value investments 25.3 24.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Diversified | Fair Value
       
Investment securities        
Fair value investments 0 3.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Diversified | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Diversified | Level 2 Inputs
       
Investment securities        
Fair value investments 0 3.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Diversified | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Fixed maturity investments. | Fair Value
       
Investment securities        
Fair value investments 5,248.7 6,333.7 [3]    
Fair value measured on a recurring basis | Fixed maturity investments. | Level 1 Inputs
       
Investment securities        
Fair value investments 321.6 365.7 [3]    
Fair value measured on a recurring basis | Fixed maturity investments. | Level 2 Inputs
       
Investment securities        
Fair value investments 4,807.4 5,889.1 [3]    
Fair value measured on a recurring basis | Fixed maturity investments. | Level 3 Inputs
       
Investment securities        
Fair value investments 119.7 78.9 [3]    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Fair Value
       
Investment securities        
Fair value investments 261.9 305.0    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 1 Inputs
       
Investment securities        
Fair value investments 254.9 296.2    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 2 Inputs
       
Investment securities        
Fair value investments 7.0 8.8    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Municipal obligations | Fair Value
       
Investment securities        
Fair value investments 3.9 2.7    
Fair value measured on a recurring basis | Municipal obligations | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Municipal obligations | Level 2 Inputs
       
Investment securities        
Fair value investments 3.9 2.7    
Fair value measured on a recurring basis | Municipal obligations | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Fair Value
       
Investment securities        
Fair value investments 2,009.0 3,222.9    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 2 Inputs
       
Investment securities        
Fair value investments 1,959.4 3,207.8    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 3 Inputs
       
Investment securities        
Fair value investments 49.6 15.1    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Fair Value
       
Investment securities        
Fair value investments 546.5 589.2    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Level 1 Inputs
       
Investment securities        
Fair value investments 64.7 65.7    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Level 2 Inputs
       
Investment securities        
Fair value investments 481.8 523.5    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Non-cumulative perpetual preference shares | Fair Value
       
Investment securities        
Fair value investments 86.8 78.8    
Fair value measured on a recurring basis | Non-cumulative perpetual preference shares | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Non-cumulative perpetual preference shares | Level 2 Inputs
       
Investment securities        
Fair value investments 16.7 15.0    
Fair value measured on a recurring basis | Non-cumulative perpetual preference shares | Level 3 Inputs
       
Investment securities        
Fair value investments 70.1 63.8    
Fair value measured on a recurring basis | Common equity securities | Consumer | Fair Value
       
Investment securities        
Fair value investments 230.8 188.8    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 1 Inputs
       
Investment securities        
Fair value investments 230.7 188.5    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 2 Inputs
       
Investment securities        
Fair value investments 0.1 0.3    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Financials | Fair Value
       
Investment securities        
Fair value investments 301.1 219.2    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 1 Inputs
       
Investment securities        
Fair value investments 264.0 185.8    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 2 Inputs
       
Investment securities        
Fair value investments 1.3 1.5    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 3 Inputs
       
Investment securities        
Fair value investments 35.8 31.9    
Fair value measured on a recurring basis | Common equity securities | Energy | Fair Value
       
Investment securities        
Fair value investments 75.7 72.6    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 1 Inputs
       
Investment securities        
Fair value investments 75.7 72.6    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 2 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Fair Value
       
Investment securities        
Fair value investments 110.3 121.0    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Level 1 Inputs
       
Investment securities        
Fair value investments 110.3 119.9    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Level 2 Inputs
       
Investment securities        
Fair value investments 0 1.1    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Utilities | Fair Value
       
Investment securities        
Fair value investments 38.6 42.0    
Fair value measured on a recurring basis | Common equity securities | Utilities | Level 1 Inputs
       
Investment securities        
Fair value investments 38.4 41.8    
Fair value measured on a recurring basis | Common equity securities | Utilities | Level 2 Inputs
       
Investment securities        
Fair value investments 0.2 0.2    
Fair value measured on a recurring basis | Common equity securities | Utilities | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Technology | Fair Value
       
Investment securities        
Fair value investments 46.3 25.8    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 1 Inputs
       
Investment securities        
Fair value investments 46.3 25.8    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 2 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Common equity securities | Other: | Fair Value
       
Investment securities        
Fair value investments 116.4 85.6    
Fair value measured on a recurring basis | Common equity securities | Other: | Level 1 Inputs
       
Investment securities        
Fair value investments 64.5 33.0    
Fair value measured on a recurring basis | Common equity securities | Other: | Level 2 Inputs
       
Investment securities        
Fair value investments 51.9 52.2    
Fair value measured on a recurring basis | Common equity securities | Other: | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0.4    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Fair Value
       
Investment securities        
Fair value investments 919.2 755.0    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Level 1 Inputs
       
Investment securities        
Fair value investments 829.9 667.4    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Level 2 Inputs
       
Investment securities        
Fair value investments 53.5 55.3    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Level 3 Inputs
       
Investment securities        
Fair value investments 35.8 32.3    
Fair value measured on a recurring basis | Short-term investments | Fair Value
       
Investment securities        
Fair value investments 618.4 846.0    
Fair value measured on a recurring basis | Short-term investments | Level 1 Inputs
       
Investment securities        
Fair value investments 618.4 846.0    
Fair value measured on a recurring basis | Short-term investments | Level 2 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Short-term investments | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Convertible fixed maturity investments | Fair Value
       
Investment securities        
Fair value investments 145.5 143.8    
Fair value measured on a recurring basis | Convertible fixed maturity investments | Level 1 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Convertible fixed maturity investments | Level 2 Inputs
       
Investment securities        
Fair value investments 145.5 143.8    
Fair value measured on a recurring basis | Convertible fixed maturity investments | Level 3 Inputs
       
Investment securities        
Fair value investments 0 0    
Fair value measured on a recurring basis | Other long-term investments | Fair Value
       
Investment securities        
Fair value investments 258.5 [3] 268.3 [2]    
Fair value measured on a recurring basis | Other long-term investments | Level 1 Inputs
       
Investment securities        
Fair value investments 0 [3] 0 [2]    
Fair value measured on a recurring basis | Other long-term investments | Level 2 Inputs
       
Investment securities        
Fair value investments 0 [3] 0 [2]    
Fair value measured on a recurring basis | Other long-term investments | Level 3 Inputs
       
Investment securities        
Fair value investments 258.5 [3] 268.3 [2]    
Carrying value of investment accounted for using the equity method $ 34.0 $ 33.0 $ 35.3 $ 41.9
[1] (1) Excludes carrying value of $33.0 and $34.0 at January 1, 2012 and June 30, 2012 associated with other long-term investments accounted for using the equity method.
[2] (2) Carrying value includes $111.8 that is classified as assets held for sale relating to AutoOne discontinued operations.
[3] (1) Excludes carrying value of $34.0 associated with other long-term investment limited partnerships accounted for using the equity method.