Employee Benefits - Change in Projected Benefit Obligation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial Loss (Gain)	$ (31.5)	$ 176.0
Supplemental Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	162.3	149.2
Service Cost	5.3	4.6	$ 4.1
Interest Cost	3.7	4.8	5.8
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	(2.0)	20.4
Settlement	0.0	0.0
Benefits Paid	(21.6)	(16.7)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	147.7	162.3	149.2
U.S. Plan | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	1,470.6	1,323.4
Service Cost	52.3	47.4	41.6
Interest Cost	40.4	43.3	47.2
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	(19.1)	136.5
Settlement	(132.1)	0.0
Benefits Paid	(10.8)	(80.0)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	1,401.3	1,470.6	1,323.4
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	236.1	211.1
Service Cost	2.2	1.9	2.0
Interest Cost	2.2	2.9	3.9
Employee Contributions	0.6	0.6
Plan Amendment	(1.4)	(0.5)
Actuarial Loss (Gain)	(10.4)	19.1
Settlement	(9.4)	(5.4)
Benefits Paid	(5.5)	(4.1)
Foreign Exchange Rate Changes	(4.3)	10.5
Ending Balance	$ 210.1	$ 236.1	$ 211.1