Employee Benefits - Change in Projected Benefit Obligation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial Loss (Gain)	$ 53.3	$ (365.5)
Supplemental Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	113.6	147.7
Service Cost	4.8	5.6	$ 5.3
Interest Cost	5.3	3.9	3.7
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	8.4	(20.0)
Settlements	0.0	0.0
Benefits Paid	(22.9)	(23.6)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	109.2	113.6	147.7
U.S. | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	1,077.7	1,401.3
Service Cost	46.0	48.0	52.3
Interest Cost	53.9	46.3	40.4
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	36.8	(281.2)
Settlements	0.0	(125.0)
Benefits Paid	(62.7)	(11.7)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	1,151.7	1,077.7	1,401.3
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	129.0	210.1
Service Cost	1.6	1.7	2.2
Interest Cost	4.8	2.5	2.2
Employee Contributions	0.8	0.7
Plan Amendment	(0.2)	(0.3)
Actuarial Loss (Gain)	8.1	(64.3)
Settlements	0.0	(0.9)
Benefits Paid	(4.1)	(4.6)
Foreign Exchange Rate Changes	8.6	(15.9)
Ending Balance	$ 148.6	$ 129.0	$ 210.1