Employee Benefits - Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 56.6	$ 62.3
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	56.6	62.3
Income Tax Effect	14.2	15.6
Net Amount in Accumulated Other Comprehensive Income	42.4	46.7
U.S. | Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	516.5	467.7
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	516.5	467.7
Income Tax Effect	129.5	117.7
Net Amount in Accumulated Other Comprehensive Income	387.0	350.0
Non U.S. Plans | Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	29.8	34.4
Prior Service (Credit) Cost	(0.2)	0.0
Gross Amount in Accumulated Other Comprehensive Income	29.6	34.4
Income Tax Effect	3.7	5.1
Net Amount in Accumulated Other Comprehensive Income	$ 25.9	$ 29.3