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Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions | 12 Months Ended
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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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- 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 + Details
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