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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 10 years 1 month 6 days | 10 years 9 months 18 days
Gross Carrying Amount | $ 542.9 | $ 543.7
Accumulated Amortization | $ 194.4 | $ 165.5
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 10 years 2 months 12 days | 10 years 10 months 24 days
Gross Carrying Amount | $ 503.8 | $ 504.6
Accumulated Amortization | $ 171.3 | $ 144.5
Trademarks and Trade Names |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 9 years 7 months 6 days | 10 years 1 month 6 days
Gross Carrying Amount | $ 34.8 | $ 34.8
Accumulated Amortization | $ 19.9 | $ 18.3
Other Intangible Assets |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 2 years 3 months 18 days | 3 years
Gross Carrying Amount | $ 4.3 | $ 4.3
Accumulated Amortization | $ 3.2 | $ 2.7

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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://www.xbrl.org/2003/role/disclosureRef -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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