Employee Benefits - Change In Plan Assets (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value at beginning of year	$ 1,380.1
Employer Contributions	3.0	$ 21.9
Fair Value at end of year	1,601.2	1,380.1
U.S. Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value at beginning of year	1,380.1	1,506.4
Actual Return on Assets	291.8	(85.1)
Employer Contributions	0.0	50.0
Employee Contributions	0.0	0.0
Settlement	0.0	0.0
Benefits Paid	(70.7)	(91.2)
Foreign Exchange Rate Changes	0.0	0.0
Fair Value at end of year	1,601.2	1,380.1
Non U.S. Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value at beginning of year	166.7	178.7
Actual Return on Assets	18.6	(2.3)
Employer Contributions	3.1	2.6
Employee Contributions	0.6	0.4
Settlement	0.0	(2.7)
Benefits Paid	(3.6)	(1.1)
Foreign Exchange Rate Changes	4.7	(8.9)
Fair Value at end of year	$ 190.1	$ 166.7