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Segment Information - Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 753.8 | $ 667.4 | $ 1,449.6 | $ 1,375.8
Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 653.4 | 586.7 | 1,265.5 | 1,155.2
Technology |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 100.4 | 80.7 | 184.1 | 220.6
Cloud & infrastructure services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 391.3 | 333.5 | 752.5 | 651.9
Application services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 196.7 | 194.0 | 385.8 | 386.9
Business process outsourcing services | Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 65.4 | $ 59.2 | $ 127.2 | $ 116.4

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