Employee Benefits - Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 56.5	$ 56.6
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	56.5	56.6
Income Tax Effect	14.2	14.2
Net Amount in Accumulated Other Comprehensive Income	42.3	42.4
U.S. | Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	499.5	516.5
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	499.5	516.5
Income Tax Effect	125.3	129.5
Net Amount in Accumulated Other Comprehensive Income	374.2	387.0
Non U.S. Plans | Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	27.5	29.8
Prior Service (Credit) Cost	(0.1)	(0.2)
Gross Amount in Accumulated Other Comprehensive Income	27.4	29.6
Income Tax Effect	1.0	3.7
Net Amount in Accumulated Other Comprehensive Income	$ 26.4	$ 25.9