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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 753.8	$ 667.4	$ 1,449.6	$ 1,375.8
Operating income (loss)	87.0	54.0	129.9	155.8
Services
Segment Reporting Information [Line Items]
Revenue	653.4	586.7	1,265.5	1,155.2
Operating income (loss)	39.2	18.6	54.4	35.7
Technology
Segment Reporting Information [Line Items]
Revenue	100.4	80.7	184.1	220.6
Operating income (loss)	55.1	38.2	84.5	120.2
Intersegment
Segment Reporting Information [Line Items]
Revenue	(2.1)	(4.0)	(4.5)	(14.0)
Intersegment | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Intersegment | Technology
Segment Reporting Information [Line Items]
Revenue	2.1	4.0	4.5	14.0
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	94.3	56.8	138.9	155.9
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	653.4	586.7	1,265.5	1,155.2
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	102.5	84.7	188.6	234.6
Corporate
Segment Reporting Information [Line Items]
Revenue	(2.1)	(4.0)	(4.5)	(14.0)
Operating income (loss)	$ (7.3)	$ (2.8)	$ (9.0)	$ (0.1)

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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 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 220
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