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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 667.4	$ 666.2		$ 1,375.8	$ 1,330.7
Operating income (loss)	54.0	(3.5)	[1]	155.8	18.3
Services
Segment Reporting Information [Line Items]
Revenue	586.7	574.8		1,155.2	1,160.1
Operating income (loss)	18.6	(9.4)		35.7	17.9
Technology
Segment Reporting Information [Line Items]
Revenue	80.7	91.4		220.6	170.6
Operating income (loss)	38.2	34.4		120.2	47.4
Intersegment
Segment Reporting Information [Line Items]
Revenue	(4.0)	(5.4)		(14.0)	(10.7)
Intersegment | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0		0.0	0.0
Intersegment | Technology
Segment Reporting Information [Line Items]
Revenue	4.0	5.4		14.0	10.7
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	56.8	25.0		155.9	65.3
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	586.7	574.8		1,155.2	1,160.1
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	84.7	96.8		234.6	181.3
Corporate
Segment Reporting Information [Line Items]
Revenue	(4.0)	(5.4)		(14.0)	(10.7)
Operating income (loss)	$ (2.8)	$ (28.5)		$ (0.1)	$ (47.0)
[1] Amounts were changed to conform to the current-year presentation. See Note 3.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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