Restructuring Costs - Schedule of Accrued Restructuring Costs Activity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 79.3	$ 64.6
Restructuring Costs, Net	80.5	87.6	$ 62.2
Payments	(69.5)	(61.0)
Foreign Currency and Other	(23.1)	(11.9)
Ending balance	67.2	79.3	64.6
Employee Severance, Termination Benefits and Relocation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	47.2	46.5
Restructuring Costs, Net	45.1	64.9
Payments	(47.2)	(51.3)
Foreign Currency and Other	(24.5)	(12.9)
Ending balance	20.6	47.2	46.5
Exited Contractual Commitments and Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	32.1	18.1
Restructuring Costs, Net	35.4	22.7
Payments	(22.3)	(9.7)
Foreign Currency and Other	1.4	1.0
Ending balance	$ 46.6	$ 32.1	$ 18.1