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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 748.9 | $ 764.8 | $ 1,415.7 | $ 1,486.0
Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 613.8 | 661.5 | 1,208.9 | 1,300.5
Technology |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 135.1 | 103.3 | 206.8 | 185.5
Cloud & infrastructure services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 340.0 | 387.7 | 675.9 | 766.1
Application services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 220.4 | 217.5 | 431.0 | 419.9
Business processing outsourcing services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 53.4 | 56.3 | 102.0 | 114.5
Operating Segments | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 613.8 | 661.6 | 1,208.9 | 1,300.6
Operating Segments | Technology |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 141.0 | $ 125.2 | $ 218.3 | $ 214.1

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