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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 614.3 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,416.2 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 421.2 |
Available-for-Sale Amortized Cost, After Ten Years | 495.0 |
Amortized Cost | 2,946.7 | $ 2,945.5
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 608.0 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,422.1 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 523.5 |
Available-for-Sale Estimated Fair Value, After Ten Years | 446.7 |
Available-for-Sale, Estimated Fair Value | 3,000.3 | 2,960.0
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 19.7 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 27.4 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 21.3 |
Held-to-Maturity Amortized Cost, After Ten Years | 1.8 |
Amortized Cost | 70.2 | 92.3
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 19.8 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 27.8 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 23.2 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1.8 |
Held-to-Maturity, Estimated Fair Value | $ 72.6 | $ 94.5

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