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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 688.3	$ 666.3		$ 2,064.1	$ 1,997.0
Operating income (loss)	55.8	(2.9)	[1]	211.6	15.4
Services
Segment Reporting Information [Line Items]
Revenue	605.6	575.5		1,760.8	1,735.6
Operating income (loss)	18.6	18.7		54.3	36.6
Technology
Segment Reporting Information [Line Items]
Revenue	82.7	90.8		303.3	261.4
Operating income (loss)	34.5	29.6		154.7	77.0
Intersegment
Segment Reporting Information [Line Items]
Revenue	(4.3)	(4.4)		(18.3)	(15.1)
Intersegment | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0		0.0	0.0
Intersegment | Technology
Segment Reporting Information [Line Items]
Revenue	4.3	4.4		18.3	15.1
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	53.1	48.3		209.0	113.6
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	605.6	575.5		1,760.8	1,735.6
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	87.0	95.2		321.6	276.5
Corporate
Segment Reporting Information [Line Items]
Revenue	(4.3)	(4.4)		(18.3)	(15.1)
Operating income (loss)	$ 2.7	$ (51.2)		$ 2.6	$ (98.2)
[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
-Paragraph 22
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 280
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