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Segment Information - Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 757.6 | $ 688.3 | $ 2,207.2 | $ 2,064.1
Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 654.1 | 605.6 | 1,919.6 | 1,760.8
Technology |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 103.5 | 82.7 | 287.6 | 303.3
Cloud & infrastructure services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 405.9 | 348.3 | 1,158.4 | 1,000.2
Application services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 188.3 | 191.2 | 574.1 | 578.1
Business process outsourcing services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 59.9 | $ 66.1 | $ 187.1 | $ 182.5

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