Divestitures - Summary Cash Inflows (Outflows) Related to Ongoing Activities of Discontinued Operations (Detail) - Discontinued Operations [Member] - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025
Belden Inc. [Member] \| Transition Service Agreement Fees [Member]
Disposal Group, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows (outflows)	$ 4.8	$ 0.0
Amphenol [Member] \| Transition Service Agreement Fees [Member]
Disposal Group, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows (outflows)	(5.8)	24.4
Amphenol [Member] \| Manufacturing Supply Agreement Inventory Sales [Member]
Disposal Group, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows (outflows)	8.4	16.2
Vantiva [Member] \| Transition Service Agreement Fees [Member]
Disposal Group, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows (outflows)	0.0	3.5
Vantiva [Member] \| Supply Agreement Inventory Sales [Member]
Disposal Group, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows (outflows)	$ 0.0	$ 14.2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details