Components of Change in Projected Benefit Obligation and Change in Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in projected benefit obligation:
Benefit obligation, beginning balance	$ 3,709.6	$ 3,761.9
Service cost	148.5	148.4	$ 130.4
Interest cost	$ 84.9	$ 65.3	83.0
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	$ (107.7)	$ (102.0)
Actuarial (gain) loss	(1,190.4)	(146.9)
Currency translation and other	(78.3)	(17.6)
Participant contributions	0.4	0.5
Projected benefit obligation, ending balance	2,567.0	3,709.6	3,761.9
Change in plan assets:
Fair value of plan assets, beginning balance	4,094.5	3,793.4
Employer contributions	39.1	25.1
Actual (loss) gain on plan assets	(809.6)	395.8
Benefits paid	(107.7)	(102.0)
Currency translation and other	(101.5)	(18.3)
Participant contributions	0.4	0.5
Fair value of plan assets, ending balance	3,115.2	4,094.5	$ 3,793.4
Funded status, ending balance	548.2	384.9
Amounts recorded on Balance Sheet:
Other noncurrent assets	671.2	553.2
Accounts payable, accrued expenses and other	18.0	19.6
Other liabilities	105.0	148.7
Accumulated other comprehensive loss:
Actuarial loss	97.9	264.0
Prior service cost	$ 13.0	$ 5.8