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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 652.4 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,446.5 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 627.9 |
Available-for-Sale Amortized Cost, After Ten Years | 642.4 |
Amortized Cost | 3,369.2 | $ 2,945.5
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 931.3 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,251.2 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 864.5 |
Available-for-Sale Estimated Fair Value, After Ten Years | 406.5 |
Available-for-Sale, Estimated Fair Value | 3,453.5 | 2,960.0
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 8.9 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 30.5 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 14.1 |
Held-to-Maturity Amortized Cost, After Ten Years | 1.5 |
Amortized Cost | 55.0 | 92.3
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 8.9 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 31.9 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 16.1 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1.5 |
Held-to-Maturity, Estimated Fair Value | 58.4 | 94.5
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase | 820.3 | 697.6
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 2,097.6 | 2,132.0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | $ 2,165.0 | $ 2,144.9

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