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Investment Securities (Non-agency Commercial Mortgage-backed Securities) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fixed rate CMBS | Super Senior
      
Investment securities      
Fair value investments $ 212,300,000 [1]    
Fixed rate CMBS | Senior
      
Investment securities      
Fair value investments 90,400,000 [2]    
Fixed rate CMBS | Subordinate
      
Investment securities      
Fair value investments 8,800,000 [3]    
Floating rate CMBS | Super Senior
      
Investment securities      
Fair value investments 15,600,000 [1]    
Floating rate CMBS | Senior
      
Investment securities      
Fair value investments 1,400,000 [2]    
Floating rate CMBS | Subordinate
      
Investment securities      
Fair value investments 5,600,000 [3]    
Commercial | Super Senior
      
Investment securities      
Fair value investments 227,900,000 [1]    
Commercial | Senior
      
Investment securities      
Fair value investments 91,800,000 [2]    
Commercial | Subordinate
      
Investment securities      
Fair value investments 14,400,000 [3]    
Fair value
      
Investment securities      
Fair value investments 7,581,300,000 [4],[5] 8,346,800,000 [4],[5],[6],[7] 7,901,600,000 [6]
Fair value | Fixed rate CMBS
      
Investment securities      
Fair value investments 311,500,000    
Fair value | Floating rate CMBS
      
Investment securities      
Fair value investments 22,600,000    
Fair value | Commercial
      
Investment securities      
Fair value investments $ 334,100,000 $ 276,700,000  
[1] At issuance, Super Senior were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to other AAA or Aaa bonds.
[2] At issuance, Senior were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to non-AAA or non-Aaa bonds.
[3] At issuance, Subordinate were not rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were junior to AAA or Aaa bonds.
[4] Excludes carrying value of $33.0 and $35.0 at January 1, 2012 and December 31, 2012 associated with other long-term investments accounted for using the equity method and $(0.1) at December 31, 2012 related to currency forward contracts.
[5] Carrying value includes $111.8 and $338.1 at January 1, 2012 and December 31, 2012 that is classified as assets held for sale relating to discontinued operations.
[6] Excludes carrying value of $33.0 and $41.9 at December 31, 2011 and January 1, 2011 associated with other long-term investment limited partnerships accounted for using the equity method.
[7] Carrying value includes $111.8 that is classified as assets held for sale relating to AutoOne discontinued operations.