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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 666.3	$ 683.3	$ 1,997.0	$ 2,099.0
Operating income (loss)	(27.0)	(9.8)	(54.5)	12.1
Services
Segment Reporting Information [Line Items]
Revenue	575.5	600.9	1,735.6	1,809.8
Operating income (loss)	18.7	15.5	36.6	32.2
Technology
Segment Reporting Information [Line Items]
Revenue	90.8	82.4	261.4	289.2
Operating income (loss)	29.6	28.6	77.0	110.2
Intersegment
Segment Reporting Information [Line Items]
Revenue	(4.4)	(5.8)	(15.1)	(17.3)
Intersegment | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Intersegment | Technology
Segment Reporting Information [Line Items]
Revenue	4.4	5.8	15.1	17.3
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	48.3	44.1	113.6	142.4
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	575.5	600.9	1,735.6	1,809.8
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	95.2	88.2	276.5	306.5
Corporate
Segment Reporting Information [Line Items]
Revenue	(4.4)	(5.8)	(15.1)	(17.3)
Operating income (loss)	$ (75.3)	$ (53.9)	$ (168.1)	$ (130.3)

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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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