Employee Benefits - Employee Benefit Plan Status (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	$ 1,601.2	$ 1,380.1
Supplemental Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	131.5	120.9
Projected Benefit Obligation	149.2	135.6	$ 144.5
Plan Assets at Fair Value	0.0	0.0
Funded Status at end of year	$ (149.2)	$ (135.6)
Weighted-Average Assumptions:
Discount Rates	3.37%	4.47%
Rate of Increase in Compensation Level	4.97%	4.39%
U.S. Plan | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 1,181.9	$ 980.6
Projected Benefit Obligation	1,323.4	1,092.0	1,209.9
Plan Assets at Fair Value	1,601.2	1,380.1	1,506.4
Funded Status at end of year	$ 277.8	$ 288.1
Weighted-Average Assumptions:
Discount Rates	3.37%	4.47%
Rate of Increase in Compensation Level	4.97%	4.39%
Expected Long-Term Rate of Return on Assets	5.25%	6.00%
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 204.7	$ 178.4
Projected Benefit Obligation	211.1	183.5	198.3
Plan Assets at Fair Value	190.1	166.7	$ 178.7
Funded Status at end of year	$ (21.0)	$ (16.8)
Weighted-Average Assumptions:
Discount Rates	1.40%	2.16%
Rate of Increase in Compensation Level	1.50%	1.75%
Expected Long-Term Rate of Return on Assets	1.72%	2.39%