Reportable Business Segments, Segment Results (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment reporting information
Number of reportable business segments | segment			2
Net sales	$ 2,818.5	$ 2,323.4	$ 7,849.5	$ 6,172.9
Operating income	571.2	475.8	1,512.2	1,150.1
Interconnect Products and Assemblies
Segment reporting information
Net sales	2,699.2	2,221.9	7,520.5	5,899.4
Cable Products and Solutions
Segment reporting information
Net sales	119.3	101.5	329.0	273.5
Operating Segment
Segment reporting information
Net sales	2,818.5	2,323.4	7,849.5	6,172.9
Operating income	607.9	509.3	1,672.3	1,243.3
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	2,699.2	2,221.9	7,520.5	5,899.4
Operating income	603.3	498.4	1,652.3	1,217.6
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales	119.3	101.5	329.0	273.5
Operating income	4.6	10.9	20.0	25.7
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	49.7	28.0	120.3	66.7
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales	34.4	18.4	79.1	39.4
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales	15.3	9.6	41.2	27.3
Inter-Segment | Corporate and Other
Segment reporting information
Net sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0