Long-Duration Insurance Contracts - Deferred Sale Inducement Costs, Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Movement in Deferred Sales Inducements [Roll Forward]
Balance, beginning of period	$ 12.8	$ 14.1
Capitalizations	0.0	0.0
Amortization expense	(0.9)	(1.0)
Experience adjustment	(0.4)	(0.3)
Balance, end of period	$ 11.5	$ 12.8