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Acquisitions (Details) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended			12 Months Ended
	Dec. 09, 2020 USD ($) segment $ / shares	Jan. 31, 2021 USD ($) contract	Jan. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) contract	Mar. 31, 2020 USD ($)
Acquisitions
Number of acquisitions | item								9
Acquisition-related expenses				$ 11.5	$ 8.9	$ 16.5	$ 11.5	$ 25.4	$ 8.5
Acquisition-related expenses, net of tax				10.7	$ 7.8	$ 13.2	10.7	21.0	7.2
Purchase price, net of cash acquired							50.4	937.4	158.9
Goodwill deductible for tax purposes								455.0
Goodwill				5,032.1			5,032.1	4,867.1	4,103.2
Amortization expense							$ 49.6	67.3	46.9
SSI Controls Technologies
Acquisitions
Aggregate purchase price, net of cash acquired (subject to post-closing adjustments)			$ 400.0
Contingent consideration										$ 75.0
MTS Systems Corporation
Acquisitions
Acquisition price per share | $ / shares	$ 58.50
Number of business segments | segment	2
Agreed upon Purchase Price, net of cash acquired including assumption of outstanding debt and liabilities	$ 1,700.0
2019 Acquisitions [Member]
Acquisitions
Goodwill								784.6
Definite-lived intangible assets								111.8
2019 Acquisitions [Member] | Minimum
Acquisitions
Useful lives							5 years
2019 Acquisitions [Member] | Maximum
Acquisitions
Useful lives							10 years
Backlog
Acquisitions
Amortization expense								15.7
Backlog | SSI Controls Technologies
Acquisitions
Amortization expense								$ 12.5
Cable Products and Solutions
Acquisitions
Number of acquisitions | item								1
Goodwill				157.6			$ 157.6	$ 157.1	$ 146.5
Interconnect Products and Assemblies
Acquisitions
Number of acquisitions | contract							2		3
Purchase price, net of cash acquired							$ 50.4		$ 158.9
Goodwill				$ 4,874.5			$ 4,874.5	$ 4,710.0	$ 3,956.7
Subsequent Event | Interconnect Products and Assemblies
Acquisitions
Number of acquisitions | contract		2
Purchase price, net of cash acquired		$ 145.0

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