Employee Benefits - Change in Projected Benefit Obligation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial (Gain) Loss	$ (131.4)	$ 164.5
Supplemental Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	144.5	121.1
Service Cost	4.3	3.7	$ 3.5
Interest Cost	5.3	5.2	5.1
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial (Gain) Loss	(9.7)	21.5
Settlement	0.0	0.0
Acquisitions/Divestitures	0.0	0.0
Benefits Paid	(8.8)	(7.0)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	135.6	144.5	121.1
U.S. Plan | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	1,209.9	1,062.7
Service Cost	41.4	38.3	37.4
Interest Cost	44.3	45.9	45.8
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial (Gain) Loss	(112.4)	142.6
Settlement	0.0	0.0
Acquisitions/Divestitures	0.0	0.0
Benefits Paid	(91.2)	(79.6)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	1,092.0	1,209.9	1,062.7
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	198.3	155.9
Service Cost	1.7	0.4	0.0
Interest Cost	4.0	4.0	4.7
Employee Contributions	0.4	0.1
Plan Amendment	1.3	2.5
Actuarial (Gain) Loss	(9.3)	0.4
Settlement	(2.7)	(6.8)
Acquisitions/Divestitures	0.0	27.0
Benefits Paid	(1.1)	(3.0)
Foreign Exchange Rate Changes	(9.1)	17.8
Ending Balance	$ 183.5	$ 198.3	$ 155.9