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Goodwill and Intangibles - Goodwill (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) segment | Sep. 30, 2018 USD ($) item | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Gross Balance |  |  |  |
Balance at the beginning of the period |  |  | $ 717.6 | $ 699.8
Acquired During the Period |  |  | 1.5 | 2.0
Foreign Currency Translation and Other |  |  | (4.4) | 15.8
Balance at the end of the period |  |  | 714.7 | 717.6
Accumulated Impairment Losses |  |  |  |
Balance at the beginning of the period |  |  | (167.1) | (167.1)
Balance at the end of the period |  |  | (167.1) | (167.1)
Net Goodwill | $ 547.6 | $ 547.6 | 547.6 | 550.5
Number of geographic segments | 3 | 3 |  |
Americas |  |  |  |
Gross Balance |  |  |  |
Balance at the beginning of the period |  |  | 437.4 | 434.7
Acquired During the Period |  |  | 1.5 | 2.0
Foreign Currency Translation and Other |  |  | (0.4) | 0.7
Balance at the end of the period |  |  | 438.5 | 437.4
Accumulated Impairment Losses |  |  |  |
Balance at the beginning of the period |  |  | (24.5) | (24.5)
Balance at the end of the period |  |  | (24.5) | (24.5)
Net Goodwill | $ 414.0 | $ 414.0 | 414.0 | 412.9
Europe |  |  |  |
Gross Balance |  |  |  |
Balance at the beginning of the period |  |  | 249.3 | 234.9
Foreign Currency Translation and Other |  |  | (3.0) | 14.4
Balance at the end of the period |  |  | 246.3 | 249.3
Accumulated Impairment Losses |  |  |  |
Balance at the beginning of the period |  |  | (129.7) | (129.7)
Balance at the end of the period |  |  | (129.7) | (129.7)
Net Goodwill | 116.6 | 116.6 | 116.6 | 119.6
APMEA |  |  |  |
Gross Balance |  |  |  |
Balance at the beginning of the period |  |  | 30.9 | 30.2
Foreign Currency Translation and Other |  |  | (1.0) | 0.7
Balance at the end of the period |  |  | 29.9 | 30.9
Accumulated Impairment Losses |  |  |  |
Balance at the beginning of the period |  |  | (12.9) | (12.9)
Balance at the end of the period |  |  | (12.9) | (12.9)
Net Goodwill | $ 17.0 | $ 17.0 | $ 17.0 | $ 18.0

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- Definition 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. + 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 (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 + Details
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