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Divestitures - Additional Information (Detail) € in Millions, $ in Millions						3 Months Ended			6 Months Ended
	May 01, 2025 USD ($)	Jan. 31, 2025 USD ($)	Jan. 09, 2024 USD ($)	Dec. 07, 2023 USD ($) shares	Oct. 02, 2023 EUR (€)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Oct. 02, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal, net of income taxes									$ 869.2	$ (21.9)
Transition service agreement income						$ 10.3	$ 8.4		19.0	18.0
Loss on classification as held for sale								$ 203.4
Loss on impairment of assets									0.0	17.2
Reclassification of foreign currency translation									97.9	27.4
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal, net of income taxes			$ 43.4
Pretax loss on sale						(0.6)	0.0		869.2	(21.9)
Loss on impairment of assets						0.0	17.2		0.0	17.2
Home Business Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment of assets							17.2
OneCell Business [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash consideration	$ 7.3
Cash and cash equivalents	1.2
Pretax loss on sale						4.9			4.9
Carrying amount of the net assets disposed	10.0
Reclassification of foreign currency translation	$ 2.2
OWN and Distributed Antenna Systems business unit of NICS segment [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash consideration		$ 2,000.0
Transaction expenses		9.1
Cash and cash equivalents		83.2
Gain (loss) on disposal, net of income taxes		$ 490.5
Vantiva [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition service agreement income						0.5	8.4		2.1	$ 18.0
Business acquisition number of shares issued \| shares				134,704,669
Total cash consideration paid				$ 250,465.0
Earn-out payment, up to											$ 100.0
Adjusted EBITDA \| €					€ 400
Adjusted EBITDA threshold \| €					€ 400
Loss on investment recognized							$ 17.0
Vantiva [Member] \| Initial Shares Purchased [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition non cash ownership interest acquired				24.73%
Amphenol [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition service agreement income						9.8			16.9
Amphenol [Member] \| Manufacturing Supply Agreement Inventory Sales [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash inflows related to Amphenol MSA									0.3
Amphenol [Member] \| OWN and Distributed Antenna Systems business unit of NICS segment [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues						$ 2.4			$ 4.0