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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 708.4 | $ 664.5 |
Operating income | 101.8 | 21.8 | [1]
Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 568.5 | 585.3 |
Operating income | 17.1 | 27.3 |
Technology |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 139.9 | 79.2 |
Operating income | 82.0 | 13.0 |
Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | (10.0) | (5.3) |
Intersegment | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 0.0 | 0.0 |
Intersegment | Technology |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 10.0 | 5.3 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | 99.1 | 40.3 |
Operating Segments | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 568.5 | 585.3 |
Operating Segments | Technology |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 149.9 | 84.5 |
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | (10.0) | (5.3) |
Operating income | $ 2.7 | $ (18.5) |
[1] | *Amounts were changed to conform to the current-year presentation. See Note 3.

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