Liability for Future Policy Benefit, Activity - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	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	$ (46.2)	$ 226.5