Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 1.7	$ 1.7	$ 2.4
Interest cost	3.9	4.1	2.5
Expected return on plan assets	(0.6)	(0.8)	(0.7)
Curtailment	(2.0)	0.0	0.0
Net actuarial (gain) loss	(2.9)	7.1	(16.4)
Net periodic benefit expense (income)	$ 0.1	$ 12.1	$ (12.2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)