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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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