Benefit Plans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Service cost	$ 0.4	$ 0.3
Interest cost	0.9	1.0
Expected return on plan assets	(0.2)	(0.2)
Net periodic benefit cost	$ 1.1	$ 1.1