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13. Fair Value of Financial Instruments (Details 6) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Embedded Derivatives [Member]
Dec. 31, 2011
Embedded Derivatives [Member]
As restated and amended [Member]
Sep. 30, 2012
Total liabilities [Member]
Dec. 31, 2011
Total liabilities [Member]
As restated and amended [Member]
Sep. 30, 2012
U.S. government and agency [Member]
Dec. 31, 2011
U.S. government and agency [Member]
As restated and amended [Member]
Sep. 30, 2012
State and political subdivision [Member]
Dec. 31, 2011
State and political subdivision [Member]
As restated and amended [Member]
Sep. 30, 2012
Foreign government [Member]
Dec. 31, 2011
Foreign government [Member]
As restated and amended [Member]
Sep. 30, 2012
Corporate [Member]
Dec. 31, 2011
Corporate [Member]
As restated and amended [Member]
Sep. 30, 2012
Commercial mortgage-backed (CMBS) [Member]
Dec. 31, 2011
Commercial mortgage-backed (CMBS) [Member]
As restated and amended [Member]
Sep. 30, 2012
Residential mortgage-backed (RMBS) [Member]
Dec. 31, 2011
Residential mortgage-backed (RMBS) [Member]
As restated and amended [Member]
Sep. 30, 2012
CDO/CLO [Member]
Dec. 31, 2011
CDO/CLO [Member]
As restated and amended [Member]
Sep. 30, 2012
Other asset-backed [Member]
Dec. 31, 2011
Other asset-backed [Member]
As restated and amended [Member]
Sep. 30, 2012
Available-for-sale equity securities [Member]
Dec. 31, 2011
Available-for-sale equity securities [Member]
As restated and amended [Member]
Sep. 30, 2012
Fair value option investments [Member]
Dec. 31, 2011
Fair value option investments [Member]
As restated and amended [Member]
Sep. 30, 2012
Total assets [Member]
Dec. 31, 2011
Total assets [Member]
As restated and amended [Member]
Level 3 Assets and Liabilities by Pricing Source:                                                    
Total assets Internal         $ 282.8 $ 315.4 $ 85.7 $ 30.9 $ 10.1 $ 10.4 $ 2,825.9 $ 2,662.8             $ 18.0 $ 199.3 $ 41.9 $ 59.1       $ 4.8 $ 37.9 $ 3,269.2 $ 3,315.8
Total assets External         37.8 20.8 107.2 85.7 44.9 41.4 907.3 838.7 73.7 100.6 832.8 944.2 198.5 33.1 279.1 276.4 29.3 29.4 159.3 106.9 2,669.9 2,477.2
Fair Value, Total assets, Balance         320.6 336.2 192.9 116.6 55.0 51.8 3,733.2 3,501.5 73.7 100.6 832.8 944.2 216.5 232.4 321.0 335.5 29.3 29.4 164.1 144.8 5,939.1 5,793.0
Total liabilities Internal 84.4 84.5 84.4 84.5                                            
Total liabilities External                                                        
Total liabilities $ 84.4 $ 84.5 $ 84.4 $ 84.5