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Investment Securities (Mortgage-backed Asset Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Investment securities |  |  |  |
Fair value investments | $ 2,746.0 | $ 2,328.7 |  | $ 3,208.3
FNMA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 88.6 | 53.6 |  |
FHLMC |  |  |  |
Investment securities |  |  |  |
Fair value investments | 60.5 | 38.1 |  |
GNMA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 30.8 | 23.7 |  |
Total Agency |  |  |  |
Investment securities |  |  |  |
Fair value investments | 179.9 | 115.4 |  |
Total mortgage-backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 179.9 | 115.4 |  |
Vehicle receivables |  |  |  |
Investment securities |  |  |  |
Fair value investments | 15.1 | 9.2 |  |
Credit card receivables |  |  |  |
Investment securities |  |  |  |
Fair value investments | 14.0 | 8.9 |  |
Total other asset-backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 29.1 | 18.1 |  |
Total mortgage and asset- backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 209.0 | 133.5 |  |
Level 2 Inputs |  |  |  |
Investment securities |  |  |  |
Fair value investments | 1,109.6 | 1,160.5 | $ 1,160.5 | $ 2,105.4
Level 2 Inputs | FNMA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 88.6 | 53.6 |  |
Level 2 Inputs | FHLMC |  |  |  |
Investment securities |  |  |  |
Fair value investments | 60.5 | 38.1 |  |
Level 2 Inputs | GNMA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 30.8 | 23.7 |  |
Level 2 Inputs | Total Agency |  |  |  |
Investment securities |  |  |  |
Fair value investments | 179.9 | 115.4 |  |
Level 2 Inputs | Total mortgage-backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 179.9 | 115.4 |  |
Level 2 Inputs | Vehicle receivables |  |  |  |
Investment securities |  |  |  |
Fair value investments | 15.1 | 9.2 |  |
Level 2 Inputs | Credit card receivables |  |  |  |
Investment securities |  |  |  |
Fair value investments | 14.0 | 8.9 |  |
Level 2 Inputs | Total other asset-backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 29.1 | 18.1 |  |
Level 2 Inputs | Total mortgage and asset- backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 209.0 | 133.5 |  |
Level 3 Inputs | FNMA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | FHLMC |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | GNMA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Total Agency |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Total mortgage-backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Vehicle receivables |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Credit card receivables |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Total other asset-backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0.0 | 0.0 |  |
Level 3 Inputs | Total mortgage and asset- backed securities |  |  |  |
Investment securities |  |  |  |
Fair value investments | $ 0.0 | $ 0.0 |  |

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