Reportable Business Segments, Segment Results (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Segment reporting information
Number of reportable business segments | segment			2
Net sales	$ 2,653.9	$ 1,987.5	$ 5,031.0	$ 3,849.5
Operating income	476.2	357.4	941.0	674.3
Interconnect Products and Assemblies
Segment reporting information
Net sales	2,541.3	1,898.5	4,821.4	3,677.5
Cable Products and Solutions
Segment reporting information
Net sales	112.6	89.0	209.6	172.0
Operating Segment
Segment reporting information
Net sales	2,653.9	1,987.5	5,031.0	3,849.5
Operating income	566.6	387.9	1,064.4	734.0
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	2,541.3	1,898.5	4,821.4	3,677.5
Operating income	559.7	379.5	1,049.0	719.2
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales	112.6	89.0	209.6	172.0
Operating income	6.9	8.4	15.4	14.8
Operating Segment | Corporate and Other
Segment reporting information
Net sales	0.0	0.0	0.0	0.0
Inter-Segment
Segment reporting information
Net sales	41.1	21.4	70.7	38.7
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	27.0	12.5	44.8	21.0
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales	14.1	8.9	25.9	17.7
Inter-Segment | Corporate and Other
Segment reporting information
Net sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0