Components of Change in Projected Benefit Obligation and Change in Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in projected benefit obligation:
Benefit obligation, beginning balance	$ 3,761.9	$ 3,234.4
Service cost	148.4	130.4	$ 102.0
Interest cost	65.3	83.0	95.6
Benefits paid	(102.0)	(120.2)
Actuarial (gain) loss	(146.9)	379.5
Currency translation and other	(17.6)	54.4
Participant contributions	0.5	0.4
Projected benefit obligation, ending balance	3,709.6	3,761.9	3,234.4
Change in plan assets:
Fair value of plan assets, beginning balance	3,793.4	3,226.4
Employer contributions	25.1	184.9
Actual return on plan assets	395.8	453.4
Benefits paid	(102.0)	(120.2)
Currency translation and other	(18.3)	48.5
Participant contributions	0.5	0.4
Fair value of plan assets, ending balance	4,094.5	3,793.4	$ 3,226.4
Funded status, ending balance	384.9	31.5
Amounts recorded on Balance Sheet:
Other noncurrent assets	553.2	222.1
Accounts payable, accrued expenses and other	19.6	25.5
Other liabilities	148.7	165.1
Accumulated other comprehensive loss:
Actuarial loss	264.0	571.7
Prior service cost	$ 5.8	$ 6.3