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Investment Securities (Non-agency Mortgage-backed Securities) (Details) (Fair Value, USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Investment securities        
Fair value investments $ 6,580.6 [1],[2] $ 6,950.7 [1],[2] $ 6,706.3 [3],[4] $ 7,500.8 [3],[4]
Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 55.6 160.6    
Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 284.9 334.1    
Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 340.5 494.7    
Securities Issued in 2005 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 34.9      
Securities Issued in 2005 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 0      
Securities Issued in 2005 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 34.9      
Securities Issued In 2006 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 11.0      
Securities Issued In 2006 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 8.7      
Securities Issued In 2006 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 19.7      
Securities Issued In 2007 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 4.8      
Securities Issued In 2007 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 15.0      
Securities Issued In 2007 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 19.8      
Securities Issued In 2008 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 0      
Securities Issued In 2008 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 35.0      
Securities Issued In 2008 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 35.0      
Securities Issued In 2010 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 4.9      
Securities Issued In 2010 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 12.9      
Securities Issued In 2010 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 17.8      
Securities Issued In 2011 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 0      
Securities Issued In 2011 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 39.8      
Securities Issued In 2011 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 39.8      
Securities Issued in 2012 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 0      
Securities Issued in 2012 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 122.5      
Securities Issued in 2012 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments 122.5      
Securities Issued in 2013 | Residential Mortgage Backed Securities
        
Investment securities        
Fair value investments 0      
Securities Issued in 2013 | Commercial Mortgage Backed Securities
        
Investment securities        
Fair value investments 51.0      
Securities Issued in 2013 | Mortgage-backed Securities, Issued by Private Enterprises
        
Investment securities        
Fair value investments $ 51.0      
[1] Carrying value includes $296.9 that is classified as assets held for sale relating to discontinued operations.
[2] Excludes carrying value of $34.9 associated with other long-term investment limited partnerships accounted for using the equity method and $(0.2) related to forward contracts.
[3] Excludes carrying value of $33.0 and $33.2 at March 31, 2012 and January 1, 2012 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 discontinued operations.