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Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue from External Customer [Line Items]
Customer revenue	$ 764.8	$ 806.4	$ 1,486.0	$ 1,568.1
Services
Revenue from External Customer [Line Items]
Customer revenue	661.5	703.4	1,300.5	1,385.1
Technology
Revenue from External Customer [Line Items]
Customer revenue	103.3	103.0	185.5	183.0
Cloud & Infrastructure Services | Services
Revenue from External Customer [Line Items]
Customer revenue	387.7	430.8	766.1	850.2
Application Services | Services
Revenue from External Customer [Line Items]
Customer revenue	217.5	205.1	419.9	401.3
Business Processing Outsourcing Services | Services
Revenue from External Customer [Line Items]
Customer revenue	$ 56.3	$ 67.5	$ 114.5	$ 133.6

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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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