Revenue Recognition, Disaggregation of Net Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue recognition
Net sales	$ 2,653.9	$ 1,987.5	$ 5,031.0	$ 3,849.5
United States
Revenue recognition
Net sales	779.1	569.8	1,453.0	1,185.2
China
Revenue recognition
Net sales	690.2	644.4	1,351.1	1,062.0
Other foreign locations
Revenue recognition
Net sales	1,184.6	773.3	2,226.9	1,602.3
End customers and contract manufacturers
Revenue recognition
Net sales	2,187.0	1,650.9	4,200.3	3,205.7
Distributors and resellers
Revenue recognition
Net sales	466.9	336.6	830.7	643.8
Interconnect Products and Assemblies
Revenue recognition
Net sales	2,541.3	1,898.5	4,821.4	3,677.5
Interconnect Products and Assemblies | United States
Revenue recognition
Net sales	721.8	515.8	1,343.5	1,087.2
Interconnect Products and Assemblies | China
Revenue recognition
Net sales	687.6	642.7	1,345.3	1,059.6
Interconnect Products and Assemblies | Other foreign locations
Revenue recognition
Net sales	1,131.9	740.0	2,132.6	1,530.7
Interconnect Products and Assemblies | End customers and contract manufacturers
Revenue recognition
Net sales	2,094.9	1,574.1	4,025.9	3,062.7
Interconnect Products and Assemblies | Distributors and resellers
Revenue recognition
Net sales	446.4	324.4	795.5	614.8
Cable Products and Solutions
Revenue recognition
Net sales	112.6	89.0	209.6	172.0
Cable Products and Solutions | United States
Revenue recognition
Net sales	57.3	54.0	109.5	98.0
Cable Products and Solutions | China
Revenue recognition
Net sales	2.6	1.7	5.8	2.4
Cable Products and Solutions | Other foreign locations
Revenue recognition
Net sales	52.7	33.3	94.3	71.6
Cable Products and Solutions | End customers and contract manufacturers
Revenue recognition
Net sales	92.1	76.8	174.4	143.0
Cable Products and Solutions | Distributors and resellers
Revenue recognition
Net sales	$ 20.5	$ 12.2	$ 35.2	$ 29.0