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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Available-for-Sale Amortized Cost, Within One Year | $ 57.1 |
Available-for-Sale Amortized Cost, After One Year but Within Five Years | 1,049.0 |
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years | 1,918.3 |
Available-for-Sale Amortized Cost, After Ten Years | 4,423.8 |
Amortized Cost | 7,448.2 | $ 4,859.3
Available-for-Sale, Estimated Fair Value |  |
Available-for-Sale Estimated Fair Value, Within One Year | 56.4 |
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years | 998.0 |
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years | 1,710.2 |
Available-for-Sale Estimated Fair Value, After Ten Years | 4,018.8 |
Available-for-Sale, Estimated Fair Value | 6,783.4 | 4,820.5
Held-to-Maturity, Amortized Cost |  |
Held-to-Maturity Amortized Cost, Within One Year | 5.1 |
Held-to-Maturity Amortized Cost, After One Year but Within Five Years | 546.0 |
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years | 797.1 |
Held-to-Maturity Amortized Cost, After Ten Years | 2,139.4 |
Amortized Cost | 3,487.6 | 1,687.6
Held-to-Maturity, Estimated Fair Value |  |
Held-to-Maturity Estimated Fair Value, Within One Year | 5.0 |
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years | 524.2 |
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years | 695.2 |
Held-to-Maturity Estimated Fair Value, After Ten Years | 1,839.1 |
Held-to-Maturity, Estimated Fair Value | 3,063.5 | 1,667.5
Securities Sold under Agreements to Repurchase [Abstract] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | 4,836.7 | 2,617.8
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | $ 4,265.1 | $ 2,610.8

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