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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 11 years 6 months | 11 years 8 months 12 days
Gross Carrying Amount | $ 535.0 | $ 535.0
Accumulated Amortization | $ 135.4 | $ 125.0
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 11 years 7 months 6 days | 11 years 9 months 18 days
Gross Carrying Amount | $ 497.8 | $ 497.8
Accumulated Amortization | $ 118.6 | $ 109.8
Trademarks and Trade Names |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 10 years | 9 years 9 months 18 days
Gross Carrying Amount | $ 32.9 | $ 32.9
Accumulated Amortization | $ 14.6 | $ 13.2
Other Intangible Assets |  |
Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Life (in Years) | 3 years 4 months 24 days | 3 years 7 months 6 days
Gross Carrying Amount | $ 4.3 | $ 4.3
Accumulated Amortization | $ 2.2 | $ 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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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