Commitments and Contingencies - Narrative (Detail) - FDIC Special Assessment - USD ($) $ in Millions	3 Months Ended
	Feb. 29, 2024	Dec. 31, 2023	Nov. 16, 2023
Loss Contingencies [Line Items]
Loss contingency accrual		$ 10.8
Estimate of possible loss	$ 20,400.0		$ 16,300.0
Increase in estimated loss	$ 4,100.0