Reportable Business Segments, Segment Results (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment reporting information
Number of reportable business segments | segment			2
Net sales	$ 2,015.3	$ 1,981.4	$ 3,973.8	$ 3,848.3
Operating income	399.5	408.2	775.7	785.1
Interconnect Products and Assemblies
Segment reporting information
Net sales	1,925.6	1,870.2	3,788.3	3,640.2
Cable Products and Solutions
Segment reporting information
Net sales	89.7	111.2	185.5	208.1
Operating Segment
Segment reporting information
Net sales	2,015.3	1,981.4	3,973.8	3,848.3
Operating income	437.1	434.4	857.6	836.9
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	1,925.6	1,870.2	3,788.3	3,640.2
Operating income	428.4	419.7	838.5	810.9
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales	89.7	111.2	185.5	208.1
Operating income	8.7	14.7	19.1	26.0
Inter-Segment
Segment reporting information
Net sales	21.5	11.4	40.1	22.8
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	8.1	3.2	11.0	5.8
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales	$ 13.4	$ 8.2	$ 29.1	$ 17.0