Reportable Business Segments, Segment Results (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)
Segment reporting information
Number of reportable business segments | segment			2
Net sales	$ 2,100.6	$ 2,129.0	$ 6,074.4	$ 5,977.3
Operating income	413.6	444.2	1,189.4	1,229.3
Interconnect Products and Assemblies
Segment reporting information
Net sales	2,000.8	2,019.3	5,789.0	5,659.5
Cable Products and Solutions
Segment reporting information
Net sales	99.8	109.7	285.4	317.8
Operating Segment
Segment reporting information
Net sales	2,100.6	2,129.0	6,074.4	5,977.3
Operating income	444.1	472.5	1,301.7	1,309.3
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	2,000.8	2,019.3	5,789.0	5,659.5
Operating income	433.9	458.1	1,272.4	1,268.9
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales	99.8	109.7	285.4	317.8
Operating income	10.2	14.4	29.3	40.4
Inter-Segment
Segment reporting information
Net sales	23.6	11.9	63.7	34.7
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	11.9	3.8	22.9	9.6
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales	$ 11.7	$ 8.1	$ 40.8	$ 25.1