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Reportable Business Segments and International Operations, Segment Results (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment reporting information
Number of reportable business segments | segment									2
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
Depreciation and amortization									308.1	312.1	299.7
Operating income	488.4	$ 475.8	$ 357.4	$ 316.9	429.8	$ 413.6	$ 399.5	$ 376.2	1,638.4	1,619.2	1,686.9
Segment assets (excluding goodwill)	6,887.0				5,875.6				6,887.0	5,875.6
Interconnect Products and Assemblies
Segment reporting information
Net sales									8,229.9	7,840.3	7,781.9
Cable Products and Solutions
Segment reporting information
Net sales									369.0	385.1	420.1
Operating Segment
Segment reporting information
Net sales									8,598.9	8,225.4	8,202.0
Depreciation and amortization									308.1	312.1	299.7
Operating income									1,776.6	1,762.2	1,805.1
Segment assets (excluding goodwill)	6,887.0				5,875.6				6,887.0	5,875.6	5,886.7
Capital expenditures									276.8	295.0	310.6
Operating Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales									8,229.9	7,840.3	7,781.9
Depreciation and amortization									297.1	300.1	287.2
Operating income									1,741.2	1,722.7	1,752.5
Segment assets (excluding goodwill)	6,672.8				5,666.4				6,672.8	5,666.4	5,678.6
Capital expenditures									272.1	289.6	305.0
Operating Segment | Cable Products and Solutions
Segment reporting information
Net sales									369.0	385.1	420.1
Depreciation and amortization									4.3	6.4	6.6
Operating income									35.4	39.5	52.6
Segment assets (excluding goodwill)	$ 214.2				$ 209.2				214.2	209.2	208.1
Capital expenditures									3.7	4.1	5.2
Operating Segment | Corporate and Other
Segment reporting information
Net sales									0.0	0.0	0.0
Depreciation and amortization									6.7	5.6	5.9
Capital expenditures									1.0	1.3	0.4
Inter-Segment
Segment reporting information
Net sales									96.7	86.9	46.8
Inter-Segment | Interconnect Products and Assemblies
Segment reporting information
Net sales									58.5	35.3	12.8
Inter-Segment | Cable Products and Solutions
Segment reporting information
Net sales									38.2	51.6	34.0
Inter-Segment | Corporate and Other
Segment reporting information
Net sales									$ 0.0	$ 0.0	$ 0.0

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