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Investment Securities (Mortgage-backed Asset Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Investment securities |  |  |
Fair value investments | $ 5,039.7 | $ 4,050.9 | $ 3,343.6
GNMA |  |  |
Investment securities |  |  |
Fair value investments | 283.9 | 265.5 |
FNMA |  |  |
Investment securities |  |  |
Fair value investments | 278.3 | 42.2 |
FHLMC |  |  |
Investment securities |  |  |
Fair value investments | 89.8 | 22.8 |
Total Agency |  |  |
Investment securities |  |  |
Fair value investments | 652.0 | 330.5 |
Residential |  |  |
Investment securities |  |  |
Debt Instrument, Collateral Amount | 30.2 |  |
Fair value investments | 205.3 | 133.2 |
Commercial |  |  |
Investment securities |  |  |
Fair value investments | 127.5 | 140.4 |
Total Non-agency |  |  |
Investment securities |  |  |
Fair value investments | 332.8 | 273.6 |
Total mortgage-backed securities |  |  |
Investment securities |  |  |
Fair value investments | 984.8 | 604.1 |
Credit card receivables |  |  |
Investment securities |  |  |
Fair value investments | 438.3 | 217.7 |
Vehicle receivables |  |  |
Investment securities |  |  |
Fair value investments | 479.5 | 269.7 |
Other |  |  |
Investment securities |  |  |
Fair value investments | 230.3 | 75.5 |
Total other asset-backed securities |  |  |
Investment securities |  |  |
Fair value investments | 1,148.1 | 562.9 |
Total mortgage and asset- backed securities |  |  |
Investment securities |  |  |
Fair value investments | 2,132.9 | 1,167.0 |
Level 2 Inputs |  |  |
Investment securities |  |  |
Fair value investments | 4,118.5 | 2,531.4 | $ 2,372.9
Level 2 Inputs | GNMA |  |  |
Investment securities |  |  |
Fair value investments | 283.9 | 265.5 |
Level 2 Inputs | FNMA |  |  |
Investment securities |  |  |
Fair value investments | 278.3 | 42.2 |
Level 2 Inputs | FHLMC |  |  |
Investment securities |  |  |
Fair value investments | 89.8 | 22.8 |
Level 2 Inputs | Total Agency |  |  |
Investment securities |  |  |
Fair value investments | 652.0 | 330.5 |
Level 2 Inputs | Residential |  |  |
Investment securities |  |  |
Fair value investments | 205.3 | 133.2 |
Level 2 Inputs | Commercial |  |  |
Investment securities |  |  |
Fair value investments | 127.5 | 140.4 |
Level 2 Inputs | Total Non-agency |  |  |
Investment securities |  |  |
Fair value investments | 332.8 | 273.6 |
Level 2 Inputs | Total mortgage-backed securities |  |  |
Investment securities |  |  |
Fair value investments | 984.8 | 604.1 |
Level 2 Inputs | Credit card receivables |  |  |
Investment securities |  |  |
Fair value investments | 438.3 | 217.7 |
Level 2 Inputs | Vehicle receivables |  |  |
Investment securities |  |  |
Fair value investments | 479.5 | 269.7 |
Level 2 Inputs | Other |  |  |
Investment securities |  |  |
Fair value investments | 230.3 | 75.5 |
Level 2 Inputs | Total other asset-backed securities |  |  |
Investment securities |  |  |
Fair value investments | 1,148.1 | 562.9 |
Level 2 Inputs | Total mortgage and asset- backed securities |  |  |
Investment securities |  |  |
Fair value investments | 2,132.9 | 1,167.0 |
Level 3 Inputs | GNMA |  |  |
Investment securities |  |  |
Fair value investments | 0.0 | 0.0 |
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 | Total Agency |  |  |
Investment securities |  |  |
Fair value investments | 0.0 | 0.0 |
Level 3 Inputs | Residential |  |  |
Investment securities |  |  |
Fair value investments | 0.0 | 0.0 |
Level 3 Inputs | Commercial |  |  |
Investment securities |  |  |
Fair value investments | 0.0 | 0.0 |
Level 3 Inputs | Total Non-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 | Credit card receivables |  |  |
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 | Other |  |  |
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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