Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Service cost	$ 1.4	$ 1.7	$ 1.7
Interest cost	3.8	3.9	4.1
Expected return on plan assets	(0.6)	(0.6)	(0.8)
Curtailment	0.0	(2.0)	0.0
Net actuarial loss (gain)	2.3	(2.9)	7.1
Net periodic benefit expense	$ 6.9	$ 0.1	$ 12.1
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)