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Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 495.2	$ 552.1	$ 1,449.4	$ 1,676.0
Operating income (loss)	27.7	49.4	39.3	127.6
Services
Segment Reporting Information [Line Items]
Revenue	426.0	478.8	1,247.9	1,433.8
Operating income (loss)	20.7	17.7	5.1	25.3
Technology
Segment Reporting Information [Line Items]
Revenue	69.2	73.3	201.5	242.2
Operating income (loss)	24.9	31.8	68.1	111.4
Intersegment
Segment Reporting Information [Line Items]
Revenue	(6.0)	(2.3)	(10.9)	(6.8)
Intersegment | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Intersegment | Technology
Segment Reporting Information [Line Items]
Revenue	6.0	2.3	10.9	6.8
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	45.6	49.5	73.2	136.7
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	426.0	478.8	1,247.9	1,433.8
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	75.2	75.6	212.4	249.0
Corporate
Segment Reporting Information [Line Items]
Revenue	(6.0)	(2.3)	(10.9)	(6.8)
Operating income (loss)	$ (17.9)	$ (0.1)	$ (33.9)	$ (9.1)

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