Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Beginning Balance	$ 2.9	$ 3.2
Decrease in balances related to prior year tax positions	(0.3)	(2.1)
Interest accrued	0.2	0.6
Increase in balances related to prior year tax positions		1.2
Ending Balance	$ 2.8	$ 2.9