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Segment Information - Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue from External Customer [Line Items]
Revenues	$ 683.3	$ 739.2	$ 2,099.0	$ 2,225.2
Services
Revenue from External Customer [Line Items]
Revenues	600.9	656.0	1,809.8	1,956.5
Technology
Revenue from External Customer [Line Items]
Revenues	82.4	83.2	289.2	268.7
Cloud & infrastructure services | Services
Revenue from External Customer [Line Items]
Revenues	341.9	380.0	1,017.8	1,146.1
Application services | Services
Revenue from External Customer [Line Items]
Revenues	210.4	220.7	641.4	640.6
Business processing outsourcing services | Services
Revenue from External Customer [Line Items]
Revenues	$ 48.6	$ 55.3	$ 150.6	$ 169.8

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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=26872669&loc=d3e20235-122688

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