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Investment Securities (Details 6) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Fair Value Measurements by Level        
Fair value, investment-related liabilities $ 75.5 $ 68.1    
Investment securities        
Carrying value 5,411.3 6,221.9    
Total fixed maturity investments including assets held for sale   6,333.7    
Fair Value
        
Investment securities        
Fair value investments 7,583.8 8,346.8 7,784.8 7,901.6
Level 1 Inputs
        
Investment securities        
Fair value investments 1,983.3 1,879.1 1,826.0 1,894.4
Level 2 Inputs
        
Investment securities        
Fair value investments 5,115.0 6,088.2 5,498.5 5,477.4
Fixed maturity investments. | Level 3 Inputs
        
Investment securities        
Fair value investments 179.1 78.9 84.3 128.4
U.S. Government and agency obligations
        
Investment securities        
Carrying value 266.9 305.0    
Debt securities issued by corporations
        
Investment securities        
Fair value investments 2,332.4 2,135.1    
Carrying value 2,332.4 2,135.1    
Municipal obligations
        
Investment securities        
Carrying value 2.7 2.7    
Mortgage-backed and asset-backed securities
        
Investment securities        
Carrying value 2,151.2 3,222.9    
Mortgage-backed and asset-backed securities | Fair Value
        
Investment securities        
Fair value investments 2,151.2 3,222.9    
Mortgage-backed and asset-backed securities | Level 2 Inputs
        
Investment securities        
Fair value investments 2,062.9 3,207.8    
Mortgage-backed and asset-backed securities | Level 3 Inputs
        
Investment securities        
Fair value investments 88.3 15.1    
Non-cumulative perpetual preference shares
        
Investment securities        
Carrying value 86.5 78.8    
Common equity securities | Level 3 Inputs
        
Investment securities        
Fair value investments 32.9 32.3 74.2 71.2
Other long-term investments | Level 3 Inputs
        
Investment securities        
Fair value investments 273.5 268.3 301.8 330.2
Carrying value of investment accounted for using the equity method 33.2 33.0 37.5 41.9
Fair value measured on a recurring basis | Fair Value
        
Investment securities        
Fair value investments 7,583.8 8,346.8    
Fair value measured on a recurring basis | Level 1 Inputs
        
Investment securities        
Fair value investments 1,983.3 1,879.1    
Fair value measured on a recurring basis | Level 2 Inputs
        
Investment securities        
Fair value investments 5,115.0 6,088.2    
Fair value measured on a recurring basis | Level 3 Inputs
        
Investment securities        
Fair value investments 485.5 379.5    
Fair value measured on a recurring basis | Fixed maturity investments. | Fair Value
        
Investment securities        
Fair value investments 5,411.3 6,333.7    
Fair value measured on a recurring basis | Fixed maturity investments. | Fair Value | AutoOne
        
Investment securities        
Fair value investments   111.8    
Fair value measured on a recurring basis | Fixed maturity investments. | Level 1 Inputs
        
Investment securities        
Fair value investments 328.6 365.7    
Fair value measured on a recurring basis | Fixed maturity investments. | Level 2 Inputs
        
Investment securities        
Fair value investments 4,903.6 5,889.1    
Fair value measured on a recurring basis | Fixed maturity investments. | Level 3 Inputs
        
Investment securities        
Fair value investments 179.1 78.9    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Fair Value
        
Investment securities        
Fair value investments 266.9 305.0    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 1 Inputs
        
Investment securities        
Fair value investments 259.9 296.2    
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 | Debt securities issued by corporations | Fair Value
        
Investment securities        
Fair value investments 2,332.4 2,135.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 1 Inputs
        
Investment securities        
Fair value investments 3.1 3.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 2 Inputs
        
Investment securities        
Fair value investments 2,308.3 2,131.3    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 3 Inputs
        
Investment securities        
Fair value investments 21.0      
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Fair Value
        
Investment securities        
Fair value investments 746.6 790.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 2 Inputs
        
Investment securities        
Fair value investments 725.6 790.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 3 Inputs
        
Investment securities        
Fair value investments 21.0      
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Fair Value
        
Investment securities        
Fair value investments 436.8 359.4    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 2 Inputs
        
Investment securities        
Fair value investments 436.8 359.4    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Fair Value
        
Investment securities        
Fair value investments 315.2 239.6    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 1 Inputs
        
Investment securities        
Fair value investments 3.1 3.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 2 Inputs
        
Investment securities        
Fair value investments 312.1 235.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Fair Value
        
Investment securities        
Fair value investments 262.7 225.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 2 Inputs
        
Investment securities        
Fair value investments 262.7 225.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Fair Value
        
Investment securities        
Fair value investments 193.1 155.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 2 Inputs
        
Investment securities        
Fair value investments 193.1 155.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Basic materials | Fair Value
        
Investment securities        
Fair value investments 183.3 195.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Basic materials | Level 2 Inputs
        
Investment securities        
Fair value investments 183.3 195.7    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Fair Value
        
Investment securities        
Fair value investments 165.9 140.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 2 Inputs
        
Investment securities        
Fair value investments 165.9 140.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Fair Value
        
Investment securities        
Fair value investments 25.1 24.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 2 Inputs
        
Investment securities        
Fair value investments 25.1 24.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Diversified | Fair Value
        
Investment securities        
Fair value investments 3.7 3.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Diversified | Level 2 Inputs
        
Investment securities        
Fair value investments 3.7 3.5    
Fair value measured on a recurring basis | Municipal obligations | Fair Value
        
Investment securities        
Fair value investments 2.7 2.7    
Fair value measured on a recurring basis | Municipal obligations | Level 2 Inputs
        
Investment securities        
Fair value investments 2.7 2.7    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Fair Value
        
Investment securities        
Fair value investments 2,151.2 3,222.9    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 2 Inputs
        
Investment securities        
Fair value investments 2,062.9 3,207.8    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 3 Inputs
        
Investment securities        
Fair value investments 88.3 15.1    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Fair Value
        
Investment securities        
Fair value investments 571.6 589.2    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Level 1 Inputs
        
Investment securities        
Fair value investments 65.6 65.7    
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations | Level 2 Inputs
        
Investment securities        
Fair value investments 506.0 523.5    
Fair value measured on a recurring basis | Non-cumulative perpetual preference shares | Fair Value
        
Investment securities        
Fair value investments 86.5 78.8    
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 69.8 63.8    
Fair value measured on a recurring basis | Common equity securities | Fair Value
        
Investment securities        
Fair value investments 868.7 755.0    
Fair value measured on a recurring basis | Common equity securities | Level 1 Inputs
        
Investment securities        
Fair value investments 777.2 667.4    
Fair value measured on a recurring basis | Common equity securities | Level 2 Inputs
        
Investment securities        
Fair value investments 58.6 55.3    
Fair value measured on a recurring basis | Common equity securities | Level 3 Inputs
        
Investment securities        
Fair value investments 32.9 32.3    
Fair value measured on a recurring basis | Common equity securities | Consumer | Fair Value
        
Investment securities        
Fair value investments 197.5 188.8    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 1 Inputs
        
Investment securities        
Fair value investments 197.1 188.5    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 2 Inputs
        
Investment securities        
Fair value investments 0.4 0.3    
Fair value measured on a recurring basis | Common equity securities | Financials | Fair Value
        
Investment securities        
Fair value investments 296.0 219.2    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 1 Inputs
        
Investment securities        
Fair value investments 261.9 185.8    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 2 Inputs
        
Investment securities        
Fair value investments 1.2 1.5    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 3 Inputs
        
Investment securities        
Fair value investments 32.9 31.9    
Fair value measured on a recurring basis | Common equity securities | Energy | Fair Value
        
Investment securities        
Fair value investments 80.1 72.6    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 1 Inputs
        
Investment securities        
Fair value investments 80.1 72.6    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Fair Value
        
Investment securities        
Fair value investments 123.4 121.0    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Level 1 Inputs
        
Investment securities        
Fair value investments 122.2 119.9    
Fair value measured on a recurring basis | Common equity securities | Basic materials | Level 2 Inputs
        
Investment securities        
Fair value investments 1.2 1.1    
Fair value measured on a recurring basis | Common equity securities | Utilities | Fair Value
        
Investment securities        
Fair value investments 44.0 42.0    
Fair value measured on a recurring basis | Common equity securities | Utilities | Level 1 Inputs
        
Investment securities        
Fair value investments 43.8 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 | Technology | Fair Value
        
Investment securities        
Fair value investments 29.5 25.8    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 1 Inputs
        
Investment securities        
Fair value investments 29.5 25.8    
Fair value measured on a recurring basis | Common equity securities | Other: | Fair Value
        
Investment securities        
Fair value investments 98.2 85.6    
Fair value measured on a recurring basis | Common equity securities | Other: | Level 1 Inputs
        
Investment securities        
Fair value investments 42.6 33.0    
Fair value measured on a recurring basis | Common equity securities | Other: | Level 2 Inputs
        
Investment securities        
Fair value investments 55.6 52.2    
Fair value measured on a recurring basis | Common equity securities | Other: | Level 3 Inputs
        
Investment securities        
Fair value investments   0.4    
Fair value measured on a recurring basis | Short-term investments | Fair Value
        
Investment securities        
Fair value investments 877.5 846.0    
Fair value measured on a recurring basis | Short-term investments | Level 1 Inputs
        
Investment securities        
Fair value investments 877.5 846.0    
Fair value measured on a recurring basis | Convertible fixed maturities | Fair Value
        
Investment securities        
Fair value investments 152.8 143.8    
Fair value measured on a recurring basis | Convertible fixed maturities | Level 2 Inputs
        
Investment securities        
Fair value investments 152.8 143.8    
Fair value measured on a recurring basis | Other long-term investments
        
Investment securities        
Carrying value of investment accounted for using the equity method 33.2      
Fair value measured on a recurring basis | Other long-term investments | Fair Value
        
Investment securities        
Fair value investments 273.5 268.3    
Fair value measured on a recurring basis | Other long-term investments | Level 3 Inputs
        
Investment securities        
Fair value investments 273.5 268.3    
Carrying value of investment accounted for using the equity method   $ 111.8