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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 11 years 1 month 6 days | 11 years 8 months 12 days
Gross Carrying Amount | $ 529.6 | $ 535.0
Accumulated Amortization | $ 155.7 | $ 125.0
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 11 years 2 months 12 days | 11 years 9 months 18 days
Gross Carrying Amount | $ 491.4 | $ 497.8
Accumulated Amortization | $ 135.5 | $ 109.8
Trademarks and Trade Names |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 10 years 4 months 24 days | 9 years 9 months 18 days
Gross Carrying Amount | $ 33.9 | $ 32.9
Accumulated Amortization | $ 17.6 | $ 13.2
Other Intangible Assets |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 3 years 1 month 6 days | 3 years 7 months 6 days
Gross Carrying Amount | $ 4.3 | $ 4.3
Accumulated Amortization | $ 2.6 | $ 2.0

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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