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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 576.7 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,522.7 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 256.3 |
Available-for-Sale Amortized Cost, After Ten Years | 240.8 |
Amortized Cost | 2,596.5 | $ 2,305.2
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 579.4 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,530.4 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 258.2 |
Available-for-Sale Estimated Fair Value, After Ten Years | 241.7 |
Available-for-Sale, Estimated Fair Value | 2,609.7 | 2,270.7
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 28.9 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 42.1 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 23.9 |
Held-to-Maturity Amortized Cost, After Ten Years | 3.9 |
Amortized Cost | 98.8 | 406.8
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 28.9 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 42.3 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 25.6 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 4.0 |
Held-to-Maturity, Estimated Fair Value | $ 100.8 | $ 400.7

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