Restructuring and Relocation Activities - Schedule of Program Metrics (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) employee	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost And Reserve [Line Items]
Total	$ 28.8	$ 40.9	$ 121.2
Capital expenditures	21.3	123.5	$ 52.0
Maximum
Restructuring Cost And Reserve [Line Items]
Costs of reduction in headcount as a result of reorganization	270.0
Other expenses associated with the Program	135.0
Total	405.0
Capital expenditures	255.0
Proceeds, foreign exchange and other cash items	(75.0)
Total estimated net cash cost	$ 585.0
Program
Restructuring Cost And Reserve [Line Items]
Approximate positions eliminated by the Program | employee	1,950
Costs of reduction in headcount as a result of reorganization	$ 237.0
Other expenses associated with the Program	123.0
Total estimated net cash cost		$ 120.0
Total Cumulative Expense	360.0
Cumulative capital expenditures	235.0
Program | Minimum
Restructuring Cost And Reserve [Line Items]
Costs of reduction in headcount as a result of reorganization	260.0
Other expenses associated with the Program	130.0
Total	390.0
Capital expenditures	250.0
Proceeds, foreign exchange and other cash items	(70.0)
Total estimated net cash cost	$ 570.0