Reportable Business Segments and International Operations, Disaggregation of Net Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue recognition
Net sales	$ 2,224.7	$ 2,129.0	$ 1,981.4	$ 1,866.9	$ 1,943.9	$ 1,840.8	$ 1,666.5	$ 1,560.1	$ 8,202.0	$ 7,011.3	$ 6,286.4
United States
Revenue recognition
Net sales									2,241.4	1,978.4	1,740.7
China
Revenue recognition
Net sales									2,594.0	2,067.3	1,865.6
Other foreign locations
Revenue recognition
Net sales									3,366.6	$ 2,965.6	$ 2,680.1
End customers and contract manufacturers
Revenue recognition
Net sales									6,990.2
Distributors and resellers
Revenue recognition
Net sales									1,211.8
Interconnect Products and Assemblies
Revenue recognition
Net sales									7,781.9
Interconnect Products and Assemblies | United States
Revenue recognition
Net sales									2,038.0
Interconnect Products and Assemblies | China
Revenue recognition
Net sales									2,589.9
Interconnect Products and Assemblies | Other foreign locations
Revenue recognition
Net sales									3,154.0
Interconnect Products and Assemblies | End customers and contract manufacturers
Revenue recognition
Net sales									6,667.9
Interconnect Products and Assemblies | Distributors and resellers
Revenue recognition
Net sales									1,114.0
Cable Products and Solutions
Revenue recognition
Net sales									420.1
Cable Products and Solutions | United States
Revenue recognition
Net sales									203.4
Cable Products and Solutions | China
Revenue recognition
Net sales									4.1
Cable Products and Solutions | Other foreign locations
Revenue recognition
Net sales									212.6
Cable Products and Solutions | End customers and contract manufacturers
Revenue recognition
Net sales									322.3
Cable Products and Solutions | Distributors and resellers
Revenue recognition
Net sales									$ 97.8