Employee Benefits - Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 86.6	$ 96.3
Prior Service (Credit) Cost	0.0	0.1
Gross Amount in Accumulated Other Comprehensive Income	86.6	96.4
Income Tax Effect	21.7	23.9
Net Amount in Accumulated Other Comprehensive Income	64.9	72.5
U.S. Plan | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	273.8	332.4
Prior Service (Credit) Cost	(0.1)	(0.6)
Gross Amount in Accumulated Other Comprehensive Income	273.7	331.8
Income Tax Effect	68.7	82.1
Net Amount in Accumulated Other Comprehensive Income	205.0	249.7
Non U.S. Plans | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	40.4	49.0
Prior Service (Credit) Cost	0.6	2.2
Gross Amount in Accumulated Other Comprehensive Income	41.0	51.2
Income Tax Effect	5.2	6.4
Net Amount in Accumulated Other Comprehensive Income	$ 35.8	$ 44.8