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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 666.2 | $ 748.9 | $ 1,330.7 | $ 1,415.7
Operating income (loss) | (24.8) | 49.5 | (27.5) | 21.9
Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 574.8 | 613.8 | 1,160.1 | 1,208.9
Operating income (loss) | (9.4) | 12.7 | 17.9 | 16.7
Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 91.4 | 135.1 | 170.6 | 206.8
Operating income (loss) | 34.4 | 67.6 | 47.4 | 81.7
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (5.4) | (5.9) | (10.7) | (11.5)
Intersegment | Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Intersegment | Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 5.4 | 5.9 | 10.7 | 11.5
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | 25.0 | 80.3 | 65.3 | 98.4
Operating Segments | Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 574.8 | 613.8 | 1,160.1 | 1,208.9
Operating Segments | Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 96.8 | 141.0 | 181.3 | 218.3
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (5.4) | (5.9) | (10.7) | (11.5)
Operating income (loss) | $ (49.8) | $ (30.8) | $ (92.8) | $ (76.5)

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