Employee Benefits - Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 65.8	$ 83.2
Prior Service Cost	0.4	0.6
Gross Amount in Accumulated Other Comprehensive Income	66.2	83.8
Income Tax Effect	16.4	31.9
Net Amount in Accumulated Other Comprehensive Income	49.8	51.9
U.S. Plan | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	435.4	399.0
Prior Service Cost	(1.4)	(1.8)
Gross Amount in Accumulated Other Comprehensive Income	434.0	397.2
Income Tax Effect	108.5	151.6
Net Amount in Accumulated Other Comprehensive Income	325.5	245.6
Non U.S. Plans | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	41.2	44.2
Prior Service Cost	3.6	2.5
Gross Amount in Accumulated Other Comprehensive Income	44.8	46.7
Income Tax Effect	6.0	5.3
Net Amount in Accumulated Other Comprehensive Income	$ 38.8	$ 41.4