Divestitures - Summary Cash Inflows Related to Ongoing Activities of Discontinued Operations (Detail) - Discontinued Operations [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Vantiva [Member] \| Transition Service Agreement Fees [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows	$ 3.5	$ 14.3
Vantiva [Member] \| Supply Agreement Inventory Sales [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows	8.5	18.2
Amphenol [Member] \| Transition Service Agreement Fees [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows	10.6	0.0
Amphenol [Member] \| Manufacturing Supply Agreement Inventory Sales [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, cash inflows	$ 8.1	$ 0.0