Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 0.4	$ 0.6
Interest cost	1.0	0.6
Expected return on plan assets	(0.2)	(0.1)
Net periodic benefit cost	$ 1.2	$ 1.1