Employee Benefits - Change in Projected Benefit Obligation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial Loss (Gain)	$ 20.6	$ 73.6
Supplemental Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	103.8	109.2
Service Cost	4.7	4.7	$ 4.8
Interest Cost	5.3	5.0	5.3
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	4.4	(0.8)
Settlements	0.0	0.0
Benefits Paid	(14.8)	(14.3)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	103.4	103.8	109.2
U.S. | Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	1,139.0	1,151.7
Service Cost	54.9	53.6	46.0
Interest Cost	62.1	55.6	53.9
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	23.4	(60.9)
Settlements	0.0	0.0
Benefits Paid	(83.0)	(61.0)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	1,196.4	1,139.0	1,151.7
Non U.S. Plans | Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	130.7	148.6
Service Cost	2.1	1.9	1.6
Interest Cost	4.6	4.5	4.8
Employee Contributions	0.9	0.8
Plan Amendment	0.2	(0.4)
Actuarial Loss (Gain)	(7.2)	(11.9)
Settlements	(5.1)	(1.7)
Benefits Paid	(3.6)	(4.3)
Foreign Exchange Rate Changes	14.5	(6.8)
Ending Balance	$ 137.1	$ 130.7	$ 148.6