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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 103.7 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,296.0 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 1,318.2 |
Available-for-Sale Amortized Cost, After Ten Years | 2,326.6 |
Amortized Cost | 5,044.5 | $ 5,474.8
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 102.4 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 1,244.0 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 1,247.7 |
Available-for-Sale Estimated Fair Value, After Ten Years | 2,148.1 |
Estimated Fair Value | 4,742.2 | 5,057.1
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 108.1 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 446.6 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 442.0 |
Held-to-Maturity Amortized Cost, After Ten Years | 1,574.0 |
Amortized Cost(1) | 2,570.7 | 2,688.4
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 108.0 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 427.8 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 397.8 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1,383.4 |
Investment debt securities held-to-maturity | 2,317.0 | 2,358.6
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 3,315.7 | 3,460.2
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 3,049.9 | $ 3,092.6
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Fair Value | 1,031.2 |
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Amortized Cost Basis | $ 1,064.8 |

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