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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 664.5	$ 666.8
Operating income (loss)	(2.7)	(27.6)
Services
Segment Reporting Information [Line Items]
Revenue	585.3	595.1
Operating income (loss)	27.3	4.0
Technology
Segment Reporting Information [Line Items]
Revenue	79.2	71.7
Operating income (loss)	13.0	14.0
Intersegment
Segment Reporting Information [Line Items]
Revenue	(5.3)	(5.6)
Intersegment | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0
Intersegment | Technology
Segment Reporting Information [Line Items]
Revenue	5.3	5.6
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	40.3	18.0
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	585.3	595.1
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	84.5	77.3
Corporate
Segment Reporting Information [Line Items]
Revenue	(5.3)	(5.6)
Operating income (loss)	$ (43.0)	$ (45.6)

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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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