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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 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 | 786.6 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 1,686.5 |
Available-for-Sale Amortized Cost, After Ten Years | 4,111.2 |
Amortized Cost | 6,584.8 |
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 | 746.1 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 1,524.1 |
Available-for-Sale Estimated Fair Value, After Ten Years | 3,778.6 |
Estimated Fair Value | 6,049.3 | $ 6,946.1
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 307.2 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 301.1 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 704.1 |
Held-to-Maturity Amortized Cost, After Ten Years | 2,064.5 |
Amortized Cost | 3,376.9 | 3,453.7
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 300.4 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 287.2 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 624.4 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1,813.8 |
Investment debt securities held-to-maturity | 3,025.8 | 3,052.2
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 3,607.3 | 4,998.9
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | $ 3,228.5 | $ 4,432.0

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