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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

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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

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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

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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.

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