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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 688.3 | $ 666.3 |  | $ 2,064.1 | $ 1,997.0
Operating income (loss) | 55.8 | (2.9) | [1] | 211.6 | 15.4
Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 605.6 | 575.5 |  | 1,760.8 | 1,735.6
Operating income (loss) | 18.6 | 18.7 |  | 54.3 | 36.6
Technology |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 82.7 | 90.8 |  | 303.3 | 261.4
Operating income (loss) | 34.5 | 29.6 |  | 154.7 | 77.0
Intersegment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (4.3) | (4.4) |  | (18.3) | (15.1)
Intersegment | Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 0.0 | 0.0 |  | 0.0 | 0.0
Intersegment | Technology |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 4.3 | 4.4 |  | 18.3 | 15.1
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | 53.1 | 48.3 |  | 209.0 | 113.6
Operating Segments | Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 605.6 | 575.5 |  | 1,760.8 | 1,735.6
Operating Segments | Technology |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 87.0 | 95.2 |  | 321.6 | 276.5
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (4.3) | (4.4) |  | (18.3) | (15.1)
Operating income (loss) | $ 2.7 | $ (51.2) |  | $ 2.6 | $ (98.2)
[1] | Amounts were changed to conform to the current-year presentation. See Note 3.

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