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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 0.5 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 814.4 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 1,655.7 |
Available-for-Sale Amortized Cost, After Ten Years | 3,979.0 |
Amortized Cost | 6,449.6 | $ 7,573.5
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 0.5 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 761.3 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 1,472.1 |
Available-for-Sale Estimated Fair Value, After Ten Years | 3,624.0 |
Estimated Fair Value | 5,857.9 | 6,946.1
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 308.1 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 346.6 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 654.3 |
Held-to-Maturity Amortized Cost, After Ten Years | 2,009.4 |
Amortized Cost1 | 3,318.4 | 3,453.7
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 301.7 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 322.9 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 567.9 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1,732.2 |
Investment debt securities held-to-maturity | 2,924.7 | 3,052.2
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 7,227.8 | 4,998.9
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | $ 6,455.1 | $ 4,432.0

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