Revenue Recognition, Disaggregation of Net Sales (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue recognition
Net sales	$ 2,100.6	$ 2,129.0	$ 6,074.4	$ 5,977.3
United States
Revenue recognition
Net sales	667.9	572.0	1,879.6	1,675.3
China
Revenue recognition
Net sales	594.5	698.3	1,660.2	1,763.3
Other foreign locations
Revenue recognition
Net sales	838.2	858.7	2,534.6	2,538.7
End customers and contract manufacturers
Revenue recognition
Net sales	1,790.1	1,814.9	5,164.5	5,071.7
Distributors and resellers
Revenue recognition
Net sales	310.5	314.1	909.9	905.6
Interconnect Products and Assemblies
Revenue recognition
Net sales	2,000.8	2,019.3	5,789.0	5,659.5
Interconnect Products and Assemblies | United States
Revenue recognition
Net sales	613.6	517.9	1,736.3	1,519.5
Interconnect Products and Assemblies | China
Revenue recognition
Net sales	593.2	696.9	1,656.1	1,760.0
Interconnect Products and Assemblies | Other foreign locations
Revenue recognition
Net sales	794.0	804.5	2,396.6	2,380.0
Interconnect Products and Assemblies | End customers and contract manufacturers
Revenue recognition
Net sales	1,710.1	1,725.9	4,944.2	4,828.9
Interconnect Products and Assemblies | Distributors and resellers
Revenue recognition
Net sales	290.7	293.4	844.8	830.6
Cable Products and Solutions
Revenue recognition
Net sales	99.8	109.7	285.4	317.8
Cable Products and Solutions | United States
Revenue recognition
Net sales	54.3	54.1	143.3	155.8
Cable Products and Solutions | China
Revenue recognition
Net sales	1.3	1.4	4.1	3.3
Cable Products and Solutions | Other foreign locations
Revenue recognition
Net sales	44.2	54.2	138.0	158.7
Cable Products and Solutions | End customers and contract manufacturers
Revenue recognition
Net sales	80.0	89.0	220.3	242.8
Cable Products and Solutions | Distributors and resellers
Revenue recognition
Net sales	$ 19.8	$ 20.7	$ 65.1	$ 75.0