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Investments - AFS Securities with Cost Basis in Excess of Fair Value - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale fixed-maturities with cost basis in excess of fair values, cost basis	$ 1,944.9		$ 1,944.9		$ 2,493.1
Allowance for credit losses	0.9		0.9		$ 0.0
Available-for-sale credit (gains) losses	$ 0.9	$ 0.5	$ 0.9	$ 0.5

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- Definition

Available-for-sale fixed-maturities with cost basis in excess of fair values, cost basis.

+ References

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Debt securities held to maturity allowance for credit loss.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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