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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 112.5 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,303.3 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 1,254.5 |
Available-for-Sale Amortized Cost, After Ten Years | 2,541.0 |
Amortized Cost | 5,211.3 | $ 5,474.8
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 111.3 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,240.8 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 1,180.6 |
Available-for-Sale Estimated Fair Value, After Ten Years | 2,331.6 |
Estimated Fair Value | 4,864.3 | 5,057.1
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 100.1 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 465.8 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 443.6 |
Held-to-Maturity Amortized Cost, After Ten Years | 1,630.8 |
Amortized Cost(1) | 2,640.3 | 2,688.4
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 99.8 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 443.5 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 395.2 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1,422.7 |
Investment debt securities held-to-maturity | 2,361.2 | 2,358.6
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 3,234.9 | 3,460.2
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 2,945.8 | $ 3,092.6
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Fair Value | 1,043.2 |
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Amortized Cost Basis | $ 1,081.3 |

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