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Reportable Business Segments and International Operations, Disaggregation of Net Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue recognition
Net sales	$ 2,426.0	$ 2,323.4	$ 1,987.5	$ 1,862.0	$ 2,151.0	$ 2,100.6	$ 2,015.3	$ 1,958.5	$ 8,598.9	$ 8,225.4	$ 8,202.0
United States
Revenue recognition
Net sales									2,494.0	2,524.7	2,241.4
China
Revenue recognition
Net sales									2,597.5	2,306.4	2,594.0
Other foreign locations
Revenue recognition
Net sales									3,507.4	3,394.3	3,366.6
End customers and contract manufacturers
Revenue recognition
Net sales									7,244.7	6,985.4	6,990.2
Distributors and resellers
Revenue recognition
Net sales									1,354.2	1,240.0	1,211.8
Interconnect Products and Assemblies
Revenue recognition
Net sales									8,229.9	7,840.3	7,781.9
Interconnect Products and Assemblies | United States
Revenue recognition
Net sales									2,282.6	2,323.5	2,038.0
Interconnect Products and Assemblies | China
Revenue recognition
Net sales									2,590.3	2,300.6	2,589.9
Interconnect Products and Assemblies | Other foreign locations
Revenue recognition
Net sales									3,357.0	3,216.2	3,154.0
Interconnect Products and Assemblies | End customers and contract manufacturers
Revenue recognition
Net sales									6,934.1	6,684.0	6,667.9
Interconnect Products and Assemblies | Distributors and resellers
Revenue recognition
Net sales									1,295.8	1,156.3	1,114.0
Cable Products and Solutions
Revenue recognition
Net sales									369.0	385.1	420.1
Cable Products and Solutions | United States
Revenue recognition
Net sales									211.4	201.2	203.4
Cable Products and Solutions | China
Revenue recognition
Net sales									7.2	5.8	4.1
Cable Products and Solutions | Other foreign locations
Revenue recognition
Net sales									150.4	178.1	212.6
Cable Products and Solutions | End customers and contract manufacturers
Revenue recognition
Net sales									310.6	301.4	322.3
Cable Products and Solutions | Distributors and resellers
Revenue recognition
Net sales									$ 58.4	$ 83.7	$ 97.8

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