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Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Revenues	$ 3,015.1	$ 3,356.4	$ 3,456.5
Services
Revenue from External Customer [Line Items]
Revenues	2,605.6	2,785.7	2,850.0
Technology
Revenue from External Customer [Line Items]
Revenues	409.5	570.7	606.5
Cloud & Infrastructure Services | Services
Revenue from External Customer [Line Items]
Revenues	1,513.1	1,704.9	1,772.4
Application Services | Services
Revenue from External Customer [Line Items]
Revenues	868.9	819.8	824.7
Business Processing Outsourcing Services | Services
Revenue from External Customer [Line Items]
Revenues	$ 223.6	$ 261.0	$ 252.9

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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=26872669&loc=d3e20235-122688

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