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Investment Securities (Mortgage-backed Asset Securities Table) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments $ 2,633.8 $ 2,547.3 $ 2,604.6 $ 1,543.5
Government National Mortgage Association Certificates and Obligations (GNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 71.1 70.3    
Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 161.1 235.5    
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 74.5 59.5    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 306.7 365.3    
Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 92.6 70.3    
Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 10.4 3.9    
Mortgage-backed Securities, Issued by Private Enterprises        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 103.0 74.2    
Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 409.7 439.5    
Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 41.8 214.2    
Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 35.4 205.9    
Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 24.5 120.2    
Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 101.7 540.3    
Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 511.4 979.8    
Level 2 Inputs        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 1,649.7 2,093.8 $ 2,058.9 $ 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 71.1 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 161.1 235.5    
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 74.5 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 306.7 365.3    
Level 2 Inputs | Residential Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 84.9 70.3    
Level 2 Inputs | Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 8.4 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 93.3 74.2    
Level 2 Inputs | Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 400.0 439.5    
Level 2 Inputs | Collateralized Credit Card Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 41.8 214.2    
Level 2 Inputs | Collateralized Auto Loans        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 35.4 205.9    
Level 2 Inputs | Collateralized Securities, Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 24.5 120.2    
Level 2 Inputs | Asset-backed Securities, Securitized Loans and Receivables        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 101.7 540.3    
Level 2 Inputs | Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 501.7 979.8    
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 7.7 0.0    
Level 3 Inputs | Commercial Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 2.0 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 9.7 0.0    
Level 3 Inputs | Collateralized Mortgage Backed Securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair value investments 9.7 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 $ 9.7 $ 0.0