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Segment Information - Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Revenues	$ 708.4	$ 664.5
Services
Revenue from External Customer [Line Items]
Revenues	568.5	585.3
Technology
Revenue from External Customer [Line Items]
Revenues	139.9	79.2
Cloud & infrastructure services | Services
Revenue from External Customer [Line Items]
Revenues	318.4	337.4
Application services | Services
Revenue from External Customer [Line Items]
Revenues	192.9	199.4
Business process outsourcing services | Services
Revenue from External Customer [Line Items]
Revenues	$ 57.2	$ 48.5

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+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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