Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Service cost	$ 2.4	$ 2.8	$ 3.3
Interest cost	2.5	2.0	2.9
Expected return on plan assets	(0.7)	(0.5)	(0.8)
Net actuarial (gain) loss	(16.4)	(1.5)	6.8
Net periodic benefit (income) expense	$ (12.2)	$ 2.8	$ 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)