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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 619.6 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,455.7 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 609.0 |
Available-for-Sale Amortized Cost, After Ten Years | 544.7 |
Amortized Cost | 3,229.0 | $ 2,945.5
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 722.3 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,381.5 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 698.6 |
Available-for-Sale Estimated Fair Value, After Ten Years | 515.2 |
Available-for-Sale, Estimated Fair Value | 3,317.6 | 2,960.0
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 19.1 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 29.4 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 17.7 |
Held-to-Maturity Amortized Cost, After Ten Years | 1.7 |
Amortized Cost | 67.9 | 92.3
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 19.2 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 30.5 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 19.7 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1.7 |
Held-to-Maturity, Estimated Fair Value | $ 71.1 | $ 94.5

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