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Investment Securities (Non-agency Mortgage-backed Securities) (Details) (Fair value, USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment securities      
Fair value investments $ 7,581,300,000 [1],[2] $ 8,346,800,000 [1],[2],[3],[4] $ 7,901,600,000 [3]
Residential
      
Investment securities      
Fair value investments 160,600,000 83,100,000  
Commercial
      
Investment securities      
Fair value investments 334,100,000 276,700,000  
Total Non-agency
      
Investment securities      
Fair value investments 494,700,000 359,800,000  
2003 | Residential
      
Investment securities      
Fair value investments 2,000,000    
2003 | Commercial
      
Investment securities      
Fair value investments 0    
2003 | Total Non-agency
      
Investment securities      
Fair value investments 2,000,000    
2006 | Residential
      
Investment securities      
Fair value investments 21,400,000    
2006 | Commercial
      
Investment securities      
Fair value investments 8,800,000    
2006 | Total Non-agency
      
Investment securities      
Fair value investments 30,200,000    
2007 | Residential
      
Investment securities      
Fair value investments 5,900,000    
2007 | Commercial
      
Investment securities      
Fair value investments 15,600,000    
2007 | Total Non-agency
      
Investment securities      
Fair value investments 21,500,000    
2009 | Residential
      
Investment securities      
Fair value investments 1,700,000    
2009 | Commercial
      
Investment securities      
Fair value investments 0    
2009 | Total Non-agency
      
Investment securities      
Fair value investments 1,700,000    
2010 | Residential
      
Investment securities      
Fair value investments 54,000,000    
2010 | Commercial
      
Investment securities      
Fair value investments 13,400,000    
2010 | Total Non-agency
      
Investment securities      
Fair value investments 67,400,000    
2011 | Residential
      
Investment securities      
Fair value investments 75,600,000    
2011 | Commercial
      
Investment securities      
Fair value investments 99,800,000    
2011 | Total Non-agency
      
Investment securities      
Fair value investments 175,400,000    
Securities Issued in 2012 [Member] | Residential
      
Investment securities      
Fair value investments 0    
Securities Issued in 2012 [Member] | Commercial
      
Investment securities      
Fair value investments 196,500,000    
Securities Issued in 2012 [Member] | Total Non-agency
      
Investment securities      
Fair value investments $ 196,500,000    
[1] 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.
[2] 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.
[3] 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.
[4] Carrying value includes $111.8 that is classified as assets held for sale relating to AutoOne discontinued operations.