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Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 534.9	$ 539.8
Accumulated Amortization	(338.3)	(333.3)
Net	196.6	206.5
Customer Lists and Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	207.6	210.1
Accumulated Amortization	(183.6)	(177.0)
Net	$ 24.0	$ 33.1
Customer Lists and Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	5 years	5 years
Customer Lists and Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	15 years	15 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 173.8	$ 174.1
Accumulated Amortization	(2.0)	(2.1)
Net	171.8	172.0
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	153.5	155.6
Accumulated Amortization	(152.7)	(154.2)
Net	$ 0.8	$ 1.4
Technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	2 years	2 years
Technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	7 years	7 years

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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.

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+ 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
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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
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-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 2
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