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Customer Revenue by Classes of Similar Products or Services (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Customer revenue	$ 3,456.5	$ 3,706.4	$ 3,853.8
Services
Revenue from External Customer [Line Items]
Customer revenue	2,996.1	3,192.4	3,354.6
Technology
Revenue from External Customer [Line Items]
Customer revenue	460.4	514.0	499.2
Systems Integration and Consulting | Services
Revenue from External Customer [Line Items]
Customer revenue	956.9	1,079.3	1,164.7
Outsourcing | Services
Revenue from External Customer [Line Items]
Customer revenue	1,428.7	1,475.5	1,487.2
Infrastructure Services | Services
Revenue from External Customer [Line Items]
Customer revenue	428.1	442.4	487.0
Core Maintenance | Services
Revenue from External Customer [Line Items]
Customer revenue	182.4	195.2	215.7
Enterprise-Class Software And Servers | Technology
Revenue from External Customer [Line Items]
Customer revenue	402.7	480.3	443.9
Other Technology | Technology
Revenue from External Customer [Line Items]
Customer revenue	$ 57.7	$ 33.7	$ 55.3

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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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