Acquisitions - Preliminary Determination of Fair Value of Identifiable Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions			1 Months Ended	9 Months Ended
		Jun. 07, 2024	Jul. 07, 2024	Sep. 30, 2024	Dec. 31, 2023
Assets
Goodwill				$ 2,906.9	$ 2,897.7
Casa Systems Inc [Member]
Business Acquisition [Line Items]
Total cash consideration paid		$ 45.1	$ 45.1
Assets
Accounts receivable, net	[1]	4.4
Inventories, net		13.6
Property, plant and equipment		2.6
Goodwill		2.2		4.3
Identifiable intangible assets		24.1
Other noncurrent assets		1.2
Less: Liabilities assumed
Accounts payable and accrued and other liabilities		2.3
Other noncurrent liabilities		0.7
Fair value allocated to net assets acquired		45.1
Casa Systems Inc [Member] | Restatement Adjustment [Member]
Business Acquisition [Line Items]
Total cash consideration paid		45.1		0.0
Assets
Accounts receivable, net	[1]	5.2		0.8
Inventories, net		9.7		(3.9)
Property, plant and equipment		6.1		3.5
Goodwill		4.3		2.1
Identifiable intangible assets		21.7		(2.4)
Other noncurrent assets		1.1		(0.1)
Less: Liabilities assumed
Accounts payable and accrued and other liabilities		2.3		0.0
Other noncurrent liabilities		0.7		0.0
Fair value allocated to net assets acquired		$ 45.1		$ 0.0

[1] The fair value of accounts receivable, net is $5.2 million with a gross contractual amount of $12.2 million. The Company expects $7.0 million to be uncollectible.