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Investment Securities (Details 3) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Investments holding table                
Percentage of investments based on observable inputs 92.00%     93.00%        
Largest single investment in a fund $ 12.8     $ 13.7        
Community reinvestment vehicle 14.1     14.1        
Tax development fund 21.2     21.8        
Percentage of private preferred stock 84.00%     85.00%        
Investment liabilities recorded at fair value 41.1     36.9        
Level 1
               
Investments holding table                
Investments at fair value 505.6 470.2 492.4 488.4        
Level 2
               
Investments holding table                
Investments at fair value 1,641.7 1,806.4 1,594.6 1,789.0        
Level 3
               
Investments holding table                
Investments at fair value 207.7 219.4 240.9 200.2 255.7 271.4 257.1 289.0
Hedge funds
               
Investments holding table                
Other investments at fair value 53.8     53.5        
Private equity funds
               
Investments holding table                
Other investments at fair value 67.8     65.7        
Fixed maturity investments
               
Investments holding table                
Runoff assets reclassified to assets held for sale 377.3              
AutoOne assets reclassified to assets held for sale       111.8        
Fixed maturity investments | Level 1
               
Investments holding table                
Investments at fair value 211.1 204.7 211.8 222.8        
Fixed maturity investments | Level 2
               
Investments holding table                
Investments at fair value 1,568.4 1,730.6 1,514.4 1,709.1        
Fixed maturity investments | Level 3
               
Investments holding table                
Investments at fair value 71.9 84.8 105.7 66.1 119.5 92.3 73.5 99.1
Debt securities issued by corporations
               
Investments holding table                
Investments at fair value 637.9     758.7        
Asset-backed securities | Fair Value
               
Investments holding table                
Investments at fair value 914.0     938.3        
Asset-backed securities | Level 2
               
Investments holding table                
Investments at fair value 912.6     936.0        
Asset-backed securities | Level 3
               
Investments holding table                
Investments at fair value 1.4     2.3        
Convertible fixed maturity investments | Level 2
               
Investments holding table                
Investments at fair value 72.6 75.6 80.1 79.8        
Other investments
               
Investments holding table                
Percentage of investments based on observable inputs 5.00%     5.00%        
Other investments | Level 3
               
Investments holding table                
Investments at fair value 135.7 133.8 134.4 133.3 135.4 136.6 141.4 150.2
Recurring basis | Fair Value
               
Investments holding table                
Investments at fair value 2,629.1 [1]     2,797.6        
Recurring basis | Level 1
               
Investments holding table                
Investments at fair value 779.7 [1]     808.4        
Recurring basis | Level 2
               
Investments holding table                
Investments at fair value 1,641.7 [1]     1,789.0        
Recurring basis | Level 3
               
Investments holding table                
Investments at fair value 207.7 [1]     200.2        
Recurring basis | Fixed maturity investments | Fair Value
               
Investments holding table                
Investments at fair value 1,851.4     1,998.0        
Recurring basis | Fixed maturity investments | Level 1
               
Investments holding table                
Investments at fair value 211.1     222.8        
Recurring basis | Fixed maturity investments | Level 2
               
Investments holding table                
Investments at fair value 1,568.4     1,709.1        
Recurring basis | Fixed maturity investments | Level 3
               
Investments holding table                
Investments at fair value 71.9     66.1        
Recurring basis | U.S. Government and agency obligations | Fair Value
               
Investments holding table                
Investments at fair value 205.2     215.4        
Recurring basis | U.S. Government and agency obligations | Level 1
               
Investments holding table                
Investments at fair value 205.2     215.4        
Recurring basis | Debt securities issued by corporations | Fair Value
               
Investments holding table                
Investments at fair value 637.9     758.7        
Recurring basis | Debt securities issued by corporations | Level 2
               
Investments holding table                
Investments at fair value 637.9     758.7        
Recurring basis | Debt securities issued by corporations | Consumer | Fair Value
               
Investments holding table                
Investments at fair value 204.9     299.7        
Recurring basis | Debt securities issued by corporations | Consumer | Level 2
               
Investments holding table                
Investments at fair value 204.9     299.7        
Recurring basis | Debt securities issued by corporations | Industrial | Fair Value
               
Investments holding table                
Investments at fair value 101.1     140.1        
Recurring basis | Debt securities issued by corporations | Industrial | Level 2
               
Investments holding table                
Investments at fair value 101.1     140.1        
Recurring basis | Debt securities issued by corporations | Financial | Fair Value
               
Investments holding table                
Investments at fair value 91.6     66.4        
Recurring basis | Debt securities issued by corporations | Financial | Level 2
               
Investments holding table                
Investments at fair value 91.6     66.4        
Recurring basis | Debt securities issued by corporations | Communications | Fair Value
               
Investments holding table                
Investments at fair value 51.8     53.3        
Recurring basis | Debt securities issued by corporations | Communications | Level 2
               
Investments holding table                
Investments at fair value 51.8     53.3        
Recurring basis | Debt securities issued by corporations | Energy | Fair Value
               
Investments holding table                
Investments at fair value 51.5     60.5        
Recurring basis | Debt securities issued by corporations | Energy | Level 2
               
Investments holding table                
Investments at fair value 51.5     60.5        
Recurring basis | Debt securities issued by corporations | Basic materials | Fair Value
               
Investments holding table                
Investments at fair value 77.9     81.5        
Recurring basis | Debt securities issued by corporations | Basic materials | Level 2
               
Investments holding table                
Investments at fair value 77.9     81.5        
Recurring basis | Debt securities issued by corporations | Utilities | Fair Value
               
Investments holding table                
Investments at fair value 44.0     42.5        
Recurring basis | Debt securities issued by corporations | Utilities | Level 2
               
Investments holding table                
Investments at fair value 44.0     42.5        
Recurring basis | Debt securities issued by corporations | Technology | Fair Value
               
Investments holding table                
Investments at fair value 15.1     14.7        
Recurring basis | Debt securities issued by corporations | Technology | Level 2
               
Investments holding table                
Investments at fair value 15.1     14.7        
Recurring basis | Municipal obligations | Fair Value
               
Investments holding table                
Investments at fair value 3.3     2.2        
Recurring basis | Municipal obligations | Level 2
               
Investments holding table                
Investments at fair value 3.3     2.2        
Recurring basis | Asset-backed securities | Fair Value
               
Investments holding table                
Investments at fair value 914.0     938.3        
Recurring basis | Asset-backed securities | Level 2
               
Investments holding table                
Investments at fair value 912.6     936.0        
Recurring basis | Asset-backed securities | Level 3
               
Investments holding table                
Investments at fair value 1.4     2.3        
Recurring basis | Foreign government obligations | Fair Value
               
Investments holding table                
Investments at fair value 6.7     8.1        
Recurring basis | Foreign government obligations | Level 1
               
Investments holding table                
Investments at fair value 5.9     7.4        
Recurring basis | Foreign government obligations | Level 2
               
Investments holding table                
Investments at fair value 0.8     0.7        
Recurring basis | Preferred stocks | Fair Value
               
Investments holding table                
Investments at fair value 84.3     75.3        
Recurring basis | Preferred stocks | Level 2
               
Investments holding table                
Investments at fair value 13.8     11.5        
Recurring basis | Preferred stocks | Level 3
               
Investments holding table                
Investments at fair value 70.5     63.8        
Recurring basis | Common Equity securities | Fair Value
               
Investments holding table                
Investments at fair value 295.3     266.5        
Recurring basis | Common Equity securities | Level 1
               
Investments holding table                
Investments at fair value 294.5     265.6        
Recurring basis | Common Equity securities | Level 2
               
Investments holding table                
Investments at fair value 0.7     0.1        
Recurring basis | Common Equity securities | Level 3
               
Investments holding table                
Investments at fair value 0.1     0.8        
Recurring basis | Common Equity securities | Consumer | Fair Value
               
Investments holding table                
Investments at fair value 69.4     71.3        
Recurring basis | Common Equity securities | Consumer | Level 1
               
Investments holding table                
Investments at fair value 69.4     71.2        
Recurring basis | Common Equity securities | Consumer | Level 2
               
Investments holding table                
Investments at fair value       0.1        
Recurring basis | Common Equity securities | Financial | Fair Value
               
Investments holding table                
Investments at fair value 80.9     69.9        
Recurring basis | Common Equity securities | Financial | Level 1
               
Investments holding table                
Investments at fair value 80.1     69.1        
Recurring basis | Common Equity securities | Financial | Level 2
               
Investments holding table                
Investments at fair value 0.7              
Recurring basis | Common Equity securities | Financial | Level 3
               
Investments holding table                
Investments at fair value 0.1     0.8        
Recurring basis | Common Equity securities | Energy | Fair Value
               
Investments holding table                
Investments at fair value 37.9     32.5        
Recurring basis | Common Equity securities | Energy | Level 1
               
Investments holding table                
Investments at fair value 37.9     32.5        
Recurring basis | Common Equity securities | Basic materials | Fair Value
               
Investments holding table                
Investments at fair value 53.2     56.2        
Recurring basis | Common Equity securities | Basic materials | Level 1
               
Investments holding table                
Investments at fair value 53.2     56.2        
Recurring basis | Common Equity securities | Utilities | Fair Value
               
Investments holding table                
Investments at fair value 19.3     17.9        
Recurring basis | Common Equity securities | Utilities | Level 1
               
Investments holding table                
Investments at fair value 19.3     17.9        
Recurring basis | Common Equity securities | Other Sector | Fair Value
               
Investments holding table                
Investments at fair value 34.6     18.7        
Recurring basis | Common Equity securities | Other Sector | Level 1
               
Investments holding table                
Investments at fair value 34.6     18.7        
Recurring basis | Short-term investments | Fair Value
               
Investments holding table                
Investments at fair value 274.1     320.0        
Recurring basis | Short-term investments | Level 1
               
Investments holding table                
Investments at fair value 274.1     320.0        
Recurring basis | Convertible fixed maturity investments | Fair Value
               
Investments holding table                
Investments at fair value 72.6     79.8        
Recurring basis | Convertible fixed maturity investments | Level 2
               
Investments holding table                
Investments at fair value 72.6     79.8        
Recurring basis | Other investments | Fair Value
               
Investments holding table                
Investments at fair value 135.7 [1]     133.3        
Recurring basis | Other investments | Level 3
               
Investments holding table                
Investments at fair value $ 135.7 [1]     $ 133.3        
[1] Excludes the carrying value of $21.2 million and $21.8 million, respectively, associated with a tax advantaged federal affordable housing development fund accounted for using the equity method as of September 30, 2012 and December 31, 2011.