Restructuring Costs - Schedule of Accrued Restructuring Costs Activity (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 67.2
Restructuring costs, net	$ 6.7	$ 45.7	17.6	$ 51.1
Payments			(34.6)
Reclassification			(13.6)
Foreign Currency and Other			(1.3)
Ending balance	35.3		35.3
Employee severance, termination benefits and relocation costs
Restructuring Cost and Reserve [Line Items]
Beginning balance			20.6
Restructuring costs, net			11.3
Payments			(19.9)
Reclassification			0.0
Foreign Currency and Other			(0.8)
Ending balance	11.2		11.2
Exited contractual commitments and other
Restructuring Cost and Reserve [Line Items]
Beginning balance			46.6
Restructuring costs, net			6.3
Payments			(14.7)
Reclassification			(13.6)
Foreign Currency and Other			(0.5)
Ending balance	$ 24.1		$ 24.1