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Investment Securities (Non-agency Residential Mortgage-backed Securities) (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Investment securities        
Fair value investments $ 1.3      
Fair Value
        
Investment securities        
Fair value investments 6,622,400,000 [1],[2] 6,950,700,000 [1],[2] 6,709,100,000 [3],[4] 7,500,800,000 [3],[4]
Residential Mortgage Backed Securities | Fair Value
        
Investment securities        
Fair value investments 130,600,000 160,600,000    
Residential Mortgage Backed Securities | Prime | Fair Value
        
Investment securities        
Fair value investments 96,200,000      
Residential Mortgage Backed Securities | Non-prime | Fair Value
        
Investment securities        
Fair value investments 26,000,000      
Residential Mortgage Backed Securities | Sub-prime | Fair Value
        
Investment securities        
Fair value investments 8,400,000      
Residential Mortgage Backed Securities | Super Senior
        
Investment securities        
Fair value investments 34,300,000 [5]      
Residential Mortgage Backed Securities | Super Senior | Prime
        
Investment securities        
Fair value investments 25,900,000 [5]      
Residential Mortgage Backed Securities | Super Senior | Non-prime
        
Investment securities        
Fair value investments 0 [5]      
Residential Mortgage Backed Securities | Super Senior | Sub-prime
        
Investment securities        
Fair value investments 8,400,000 [5]      
Residential Mortgage Backed Securities | Senior
        
Investment securities        
Fair value investments 96,300,000 [6]      
Residential Mortgage Backed Securities | Senior | Prime
        
Investment securities        
Fair value investments 70,300,000 [6]      
Residential Mortgage Backed Securities | Senior | Non-prime
        
Investment securities        
Fair value investments 26,000,000 [6]      
Residential Mortgage Backed Securities | Senior | Sub-prime
        
Investment securities        
Fair value investments 0 [6]      
Residential Mortgage Backed Securities | Subordinate
        
Investment securities        
Fair value investments 0 [7]      
Residential Mortgage Backed Securities | Subordinate | Prime
        
Investment securities        
Fair value investments 0 [7]      
Residential Mortgage Backed Securities | Subordinate | Non-prime
        
Investment securities        
Fair value investments 0 [7]      
Residential Mortgage Backed Securities | Subordinate | Sub-prime
        
Investment securities        
Fair value investments $ 0 [7]      
[1] Carrying value includes $239.7 that is classified as assets held for sale relating to discontinued operations.
[2] Excludes carrying value of $26.9 associated with other long-term investment limited partnerships accounted for using the equity method and $(0.1) related to forward contracts
[3] Carrying value includes $111.8 that is classified as assets held for sale relating to discontinued operations.
[4] Excludes carrying value of $33.0 and $34.0 at January 1, 2012 and September 30, 2012 associated with other long-term investment limited partnerships accounted for using the equity method.
[5] At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to other AAA or Aaa bonds.
[6] At issuance, Senior, or in the case of resecuritization, the underlying securities, 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.
[7] 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.