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Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
US Treasury Securities
Operating Loss Carryforwards [Line Items]
Debt securities	$ 663.0	$ 596.0
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Current federal income tax liability	$ 24.0	$ 21.0

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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