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Investment Securities (Mortgage-backed Asset Securities Table) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments $ 2,509.4 $ 2,547.3 $ 2,406.9 $ 1,543.5
Government National Mortgage Association Certificates and Obligations (GNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 51.0 70.3    
Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 88.9 235.5    
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 59.7 59.5    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 199.6 365.3    
Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 70.1 70.3    
Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 39.0 3.9    
Mortgage-backed Securities, Issued by Private Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 109.1 74.2    
Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 308.7 439.5    
Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 40.5 214.2    
Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 22.7 205.9    
Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 16.0 120.2    
Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 79.2 540.3    
Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 387.9 979.8    
Level 2 Inputs        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 1,525.2 2,093.8 $ 2,011.6 $ 585.6
Level 2 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 51.0 70.3    
Level 2 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 88.9 235.5    
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 59.7 59.5    
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 199.6 365.3    
Level 2 Inputs | Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 70.1 70.3    
Level 2 Inputs | Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 39.0 3.9    
Level 2 Inputs | Mortgage-backed Securities, Issued by Private Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 109.1 74.2    
Level 2 Inputs | Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 308.7 439.5    
Level 2 Inputs | Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 40.5 214.2    
Level 2 Inputs | Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 22.7 205.9    
Level 2 Inputs | Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 16.0 120.2    
Level 2 Inputs | Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 79.2 540.3    
Level 2 Inputs | Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 387.9 979.8    
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 0.0 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 0.0 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 0.0 0.0    
Level 3 Inputs | Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 0.0 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 0.0 0.0    
Level 3 Inputs | Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments $ 0.0 $ 0.0