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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 625.0 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,514.8 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 1,295.3 |
Available-for-Sale Amortized Cost, After Ten Years | 973.7 |
Amortized Cost | 4,408.8 | $ 3,932.7
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 722.7 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,621.1 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 1,161.6 |
Available-for-Sale Estimated Fair Value, After Ten Years | 898.2 |
Available-for-Sale, Estimated Fair Value | 4,403.6 | 4,008.7
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 662.2 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 365.7 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 263.6 |
Held-to-Maturity Amortized Cost, After Ten Years | 326.6 |
Amortized Cost | 1,618.1 | 51.6
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 667.4 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 369.7 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 266.8 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 328.6 |
Held-to-Maturity, Estimated Fair Value | 1,632.5 | 55.0
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 2,373.4 | 2,323.0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | $ 2,399.1 | $ 2,383.6

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