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Investment Securities (Mortgage-backed Asset Securities Table) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments $ 5,091.8 $ 4,050.9 $ 3,379.6 $ 3,343.6
Commercial Mortgage Backed Securities Fixed Rate [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 93.2      
Government National Mortgage Association Certificates and Obligations (GNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 284.7 265.5    
Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 203.5 42.2    
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 37.5 22.8    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 525.7 330.5    
Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 194.3 133.2    
Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 104.5 140.4    
Mortgage-backed Securities, Issued by Private Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 298.8 273.6    
Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 824.5 604.1    
Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 689.1 217.7    
Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 977.4 269.7    
Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 164.2 75.5    
Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 1,830.7 562.9    
Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 2,655.2 1,167.0    
Level 2 Inputs        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 4,061.1 2,531.4 $ 2,522.1 $ 2,372.9
Level 2 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 284.7 265.5    
Level 2 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 152.5 42.2    
Level 2 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 37.5 22.8    
Level 2 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 474.7 330.5    
Level 2 Inputs | Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 194.3 133.2    
Level 2 Inputs | Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 104.5 140.4    
Level 2 Inputs | Mortgage-backed Securities, Issued by Private Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 298.8 273.6    
Level 2 Inputs | Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 773.5 604.1    
Level 2 Inputs | Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 658.1 217.7    
Level 2 Inputs | Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 977.4 269.7    
Level 2 Inputs | Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 164.2 75.5    
Level 2 Inputs | Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 1,799.7 562.9    
Level 2 Inputs | Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 2,573.2 1,167.0    
Level 3 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 51.0 0.0    
Level 3 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 51.0 0.0    
Level 3 Inputs | Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Mortgage-backed Securities, Issued by Private Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 51.0 0.0    
Level 3 Inputs | Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 31.0 0.0    
Level 3 Inputs | Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 0.0    
Level 3 Inputs | Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 31.0 0.0    
Level 3 Inputs | Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments $ 82.0 $ 0.0