Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Goodwill.
Goodwill, Beginning Balance	$ 3,678.8	$ 2,692.9
Acquisition-related	233.8	1,031.3
Foreign currency translation	130.0	(45.4)
Goodwill, Ending Balance	4,042.6	3,678.8
Interconnect Products and Assemblies
Goodwill.
Goodwill, Beginning Balance	3,532.5	2,569.2
Acquisition-related	233.6	1,008.7
Foreign currency translation	130.0	(45.4)
Goodwill, Ending Balance	3,896.1	3,532.5
Cable Products and Solutions
Goodwill.
Goodwill, Beginning Balance	146.3	123.7
Acquisition-related	0.2	22.6
Goodwill, Ending Balance	$ 146.5	$ 146.3

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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