Restructuring Costs - Summary of Company's Net Pre-tax Restructuring Charges (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]
Restructuring costs, net	$ 46.4	$ 7.2	$ 58.8	$ 12.7
Connectivity [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	3.3	4.7	10.6	7.1
Mobility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	2.6	$ 2.5	7.7	$ 5.6
CPE [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	15.1		15.1
N&C [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	21.5		21.5
Ruckus [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	$ 3.9		$ 3.9