Reportable Business Segments, Segment Results (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment reporting information
Number of reportable business segments | segment			2
Net sales	$ 1,987.5	$ 2,015.3	$ 3,849.5	$ 3,973.8
Operating income	357.4	399.5	674.3	775.7
Interconnect Products and Assemblies
Segment reporting information
Net sales	1,898.5	1,925.6	3,677.5	3,788.3
Cable Products and Solutions
Segment reporting information
Net sales	89.0	89.7	172.0	185.5
Operating Segment
Segment reporting information
Net sales	1,987.5	2,015.3	3,849.5	3,973.8
Operating income	387.9	437.1	734.0	857.6
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	1,898.5	1,925.6	3,677.5	3,788.3
Operating income	379.5	428.4	719.2	838.5
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales	89.0	89.7	172.0	185.5
Operating income	8.4	8.7	14.8	19.1
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	21.4	21.5	38.7	40.1
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	12.5	8.1	21.0	11.0
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales	8.9	13.4	17.7	29.1
Inter-Segment | Corporate and Other
Segment reporting information
Net sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0