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Goodwill and Other Intangible Assets, Goodwill (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Goodwill. |  |  |
Goodwill, Beginning Balance | $ 3,678.8 |  |
Acquisition-related | 192.7 |  |
Foreign currency translation | 97.8 |  |
Goodwill, Ending Balance | $ 3,969.3 | $ 3,678.8 |
Number of reportable business segments | segment | 2 |  |
Goodwill impairment | $ 0.0 | 0.0 | $ 0.0
Interconnect Products and Assemblies |  |  |
Goodwill. |  |  |
Goodwill, Beginning Balance | 3,532.5 |  |
Acquisition-related | 192.7 |  |
Foreign currency translation | 97.8 |  |
Goodwill, Ending Balance | 3,823.0 | 3,532.5 |
Cable Products and Solutions |  |  |
Goodwill. |  |  |
Goodwill, Beginning Balance | 146.3 |  |
Goodwill, Ending Balance | $ 146.3 | $ 146.3 |

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