Reportable Business Segments, Segment Results (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Segment reporting information
Number of reportable business segments | segment	2
Net sales	$ 1,862.0	$ 1,958.5
Operating income	316.9	376.2
Interconnect Products and Assemblies
Segment reporting information
Net sales	1,779.0	1,862.7
Cable Products and Solutions
Segment reporting information
Net sales	83.0	95.8
Operating Segment
Segment reporting information
Net sales	1,862.0	1,958.5
Operating income	346.1	420.5
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	1,779.0	1,862.7
Operating income	339.8	410.0
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales	83.0	95.8
Operating income	6.3	10.5
Operating Segment | Corporate and Other [Member]
Segment reporting information
Net sales	0.0	0.0
Inter-Segment
Segment reporting information
Net sales	17.3	18.6
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	8.4	2.9
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales	8.9	15.7
Inter-Segment | Corporate and Other [Member]
Segment reporting information
Net sales	$ 0.0	$ 0.0