Segments and Geographic Information - Summary of Net Sales, Adjusted EBITDA, Depreciation Expense and Additions to PP&E by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 2,105.3	$ 2,168.1	$ 6,362.6	$ 6,304.1
Total segment adjusted EBITDA	259.1	341.9	856.4	853.0
Amortization of intangible assets	(153.0)	(158.1)	(461.9)	(473.5)
Restructuring (costs) credits, net	3.1	(40.3)	(100.2)	(83.6)
Equity-based compensation	(21.0)	(34.0)	(61.0)	(90.0)
Asset impairments	0.0	0.0	0.0	(206.7)
Transaction, transformation and integration costs	(26.2)	(4.8)	(62.7)	(17.8)
Acquisition accounting adjustments	(2.8)	(5.1)	(9.0)	(15.8)
Patent claims and litigation settlements	(5.0)	(1.4)	(46.5)	(11.4)
Executive severance		(6.3)		(6.3)
Depreciation	(33.2)	(38.9)	(103.6)	(118.7)
Consolidated operating loss	21.0	55.8	11.5	(170.8)
Additions to property, plant and equipment	36.0	25.8	96.2	73.5
Broadband [Member]
Segment Reporting Information [Line Items]
Net sales	779.7	811.0	2,366.4	2,069.8
Total segment adjusted EBITDA	158.1	202.3	488.3	414.9
Depreciation	14.1	14.6	42.8	44.2
Additions to property, plant and equipment	22.5	9.0	55.3	27.1
OWN [Member]
Segment Reporting Information [Line Items]
Net sales	355.6	271.8	1,036.2	949.0
Total segment adjusted EBITDA	60.5	53.6	214.4	218.4
Depreciation	3.8	4.1	11.4	12.7
Additions to property, plant and equipment	2.7	3.6	7.6	10.3
VCN [Member]
Segment Reporting Information [Line Items]
Net sales	554.9	511.8	1,587.4	1,459.7
Total segment adjusted EBITDA	56.0	55.6	135.1	131.6
Depreciation	10.3	11.7	31.8	34.9
Additions to property, plant and equipment	8.0	7.4	26.1	20.3
Home [Member]
Segment Reporting Information [Line Items]
Net sales	415.1	573.5	1,372.6	1,825.6
Total segment adjusted EBITDA	(15.5)	30.4	18.6	88.1
Depreciation	5.0	8.5	17.6	26.9
Additions to property, plant and equipment	$ 2.8	$ 5.8	$ 7.2	$ 15.8