Retirement Plans - Components of Estimated Net Periodic Benefit Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2.9	$ 1.8
Expected return on assets	(3.3)	(2.8)
Amortization, net	0.2	0.8
Net pension plan income	$ (0.2)	$ (0.2)