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Investment Securities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Marketable Securities [Abstract] |  |  |  |  |
Available-for-sale, accrued interest, after allowance for credit loss | $ 21.8 |  | $ 21.8 |  |
Carrying amount of equity investments without a readily determinable fair value | 55.2 |  | 55.2 |  | $ 25.6
Unrealized gain (loss) for equity investments with readily determinable fair values | $ 1.2 | $ 0.4 | $ (3.6) | $ 4.9 |

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