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Investments - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Interest on cash and cash equivalents	$ 7.3	$ 2.4
Fixed maturities income	5.9	2.9
Short-term investment income	10.4	3.9
Total investment income	23.6	9.2
Investment expenses	(0.5)	(0.2)
Net investment income	$ 23.1	$ 9.0

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Investment Income, Debt Securities, Available-for-sale

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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-Name Regulation S-K (SK)
-Number 229
-Section 1402
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Amount of expenses related to the generation of investment income.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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