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Investment Securities (Investment Holdings) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Including Short Term Fixed
Dec. 31, 2012
US Government and agency obligations
Dec. 31, 2011
US Government and agency obligations
Dec. 31, 2012
Debt securities issued by industrial corporations
Dec. 31, 2011
Debt securities issued by industrial corporations
Dec. 31, 2012
Municipal obligations
Dec. 31, 2011
Municipal obligations
Dec. 31, 2012
Mortgage-backed and asset-backed securities
Dec. 31, 2011
Mortgage-backed and asset-backed securities
Dec. 31, 2012
Foreign government, agency and provincial obligations
Dec. 31, 2011
Foreign government, agency and provincial obligations
Dec. 31, 2012
Preferred stocks
Dec. 31, 2011
Preferred stocks
Dec. 31, 2012
Fixed Income Investments [Member]
Dec. 31, 2011
Fixed Income Investments [Member]
Dec. 31, 2012
Excluding Short Term Investments
Investment securities                                    
Duration of Fixed Maturities including short-term investments in years     2 years 4 months 24 days                             2 years 8 months 12 days
Cost or amortized cost $ 5,576.3     $ 440.4 $ 299.4 $ 2,321.4 $ 2,072.1 $ 5.3 $ 2.7 $ 2,081.0 $ 3,190.5 $ 526.6 $ 581.2 $ 79.9 $ 82.3 $ 5,454.6 $ 6,228.2  
Gross unrealized gains       1.0 5.3 88.3 73.7 0 0 25.1 25.9 6.9 11.0 6.7 3.2 128.0 119.1  
Gross unrealized losses       (0.1) (0.1) (1.6) (7.8) (0.1) 0 (1.1) (3.9) (3.0) (0.1) 0 (6.7) (5.9) (18.6)  
Net foreign currency losses       (1.2) 0.4 (23.0) (2.9) 0 0 (9.4) 10.4 (8.6) (2.9) (0.2) 0 (42.4) 5.0  
Total fixed maturity investments including assets held for sale                               5,534.3 6,333.7  
Fixed maturity investments reclassified to assets held for sale (1) (338.1) [1] (111.8) [1]                                
Fixed maturity investments, at fair value $ 5,196.2 $ 6,221.9   $ 440.1 $ 305.0 $ 2,385.1 $ 2,135.1 $ 5.2 $ 2.7 $ 2,095.6 $ 3,222.9 $ 521.9 $ 589.2 $ 86.4 $ 78.8      
[1] Assets held for sale related to discontinued operations. See Note 20.