Long-Duration Insurance Contracts - Market Risk Benefits Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Market Risk Benefit [Roll Forward]
Balance, beginning of period	$ (6.8)	$ (3.9)
Balance, beginning of period, before effects of changes in the instrument-specific credit risk	(7.4)	(4.5)
Changes in market risk benefits	(1.7)	(2.9)
Balance, end of period	(9.1)	(7.4)
Effect of changes in the instrument-specific credit risk	0.1	0.6
Balance, end of period	(9.0)	(6.8)
Net amount at risk	$ 12.4	$ 15.9
Weighted-average attained age of contract holders	62 years	62 years