Components of Change in Projected Benefit Obligation and Change in Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in projected benefit obligation:
Benefit obligation, beginning balance	$ 2,903.3	$ 2,567.0
Service cost	107.6	94.0	$ 148.5
Interest cost	$ 135.0	$ 127.5	84.9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Costs and Expenses	Costs and Expenses
Benefits paid	$ (119.3)	$ (110.1)
Actuarial (gain) loss	(224.0)	186.5
Currency translation and other	(37.7)	37.8
Participant contributions	1.0	0.6
Projected benefit obligation, ending balance	2,765.9	2,903.3	2,567.0
Change in plan assets:
Fair value of plan assets, beginning balance	3,494.1	3,115.2
Employer contributions	40.8	27.3
Actual gain on plan assets	234.0	412.5
Benefits paid	(119.3)	(110.1)
Currency translation and other	(32.3)	48.6
Participant contributions	1.0	0.6
Fair value of plan assets, ending balance	3,618.3	3,494.1	$ 3,115.2
Funded status, ending balance	852.4	590.8
Amounts recorded on Balance Sheets:
Other noncurrent assets	995.8	734.8
Accounts payable, accrued expenses and other	29.4	23.8
Other liabilities	114.0	120.2
Accumulated other comprehensive loss:
Actuarial (gain) loss	(80.2)	98.0
Prior service cost	$ 10.5	$ 12.3