Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill.
Goodwill, Beginning Balance	$ 4,042.6	$ 3,678.8
Acquisition-related	126.7	233.8
Foreign currency translation	(66.1)	130.0
Goodwill, Ending Balance	4,103.2	4,042.6
Interconnect Products and Assemblies
Goodwill.
Goodwill, Beginning Balance	3,896.1	3,532.5
Acquisition-related	126.7	233.6
Foreign currency translation	(66.1)	130.0
Goodwill, Ending Balance	3,956.7	3,896.1
Cable Products and Solutions
Goodwill.
Goodwill, Beginning Balance	146.5	146.3
Acquisition-related		0.2
Goodwill, Ending Balance	$ 146.5	$ 146.5

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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 1
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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.

+ References

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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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