Employee Benefits - Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 62.3	$ 59.2
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	62.3	59.2
Income Tax Effect	15.6	14.8
Net Amount in Accumulated Other Comprehensive Income	46.7	44.4
U.S. | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	467.7	418.3
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	467.7	418.3
Income Tax Effect	117.7	105.1
Net Amount in Accumulated Other Comprehensive Income	350.0	313.2
Non U.S. Plans | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	34.4	24.3
Prior Service (Credit) Cost	0.0	0.2
Gross Amount in Accumulated Other Comprehensive Income	34.4	24.5
Income Tax Effect	5.1	4.9
Net Amount in Accumulated Other Comprehensive Income	$ 29.3	$ 19.6