Liability for Future Policy Benefit, Activity - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Long-term Care | Closed Block
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Adverse Development, Expense	$ (436.7)	$ 46.2	$ (226.5)
Cancer and Critical Illness Colonial | Colonial Life
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Adverse Development, Expense	$ (11.5)