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Investment Securities (Mortgage-backed Asset Securities Table) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | $ 2,534.6 | $ 2,328.7 | $ 2,532.5 | $ 3,208.3
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 59.8 | 53.6 |  |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 43.0 | 38.1 |  |
Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 25.6 | 23.7 |  |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 128.4 | 115.4 |  |
Collateralized Mortgage Backed Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 128.4 | 115.4 |  |
Collateralized Auto Loans |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 11.5 | 9.2 |  |
Collateralized Credit Card Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 8.9 | 8.9 |  |
Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 20.4 | 18.1 |  |
Mortgage-backed and asset-backed securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 148.8 | 133.5 |  |
Level 2 Inputs |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 1,237.7 | 1,160.5 | $ 1,405.1 | $ 2,105.4
Level 2 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 59.8 | 53.6 |  |
Level 2 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 43.0 | 38.1 |  |
Level 2 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 25.6 | 23.7 |  |
Level 2 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 128.4 | 115.4 |  |
Level 2 Inputs | Collateralized Mortgage Backed Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 128.4 | 115.4 |  |
Level 2 Inputs | Collateralized Auto Loans |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 11.5 | 9.2 |  |
Level 2 Inputs | Collateralized Credit Card Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 8.9 | 8.9 |  |
Level 2 Inputs | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 20.4 | 18.1 |  |
Level 2 Inputs | Mortgage-backed and asset-backed securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 148.8 | 133.5 |  |
Level 3 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Collateralized Mortgage Backed Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Collateralized Auto Loans |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Collateralized Credit Card Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Mortgage-backed and asset-backed securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Fair value investments | $ 0.0 | $ 0.0 |  |

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