Segment Information - Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 683.3	$ 739.2	$ 2,099.0	$ 2,225.2
Operating income (loss)	(9.8)	8.6	12.1	(70.9)
Services
Segment Reporting Information [Line Items]
Revenue	600.9	656.0	1,809.8	1,956.5
Operating income (loss)	15.5	31.8	32.2	37.6
Technology
Segment Reporting Information [Line Items]
Revenue	82.4	83.2	289.2	268.7
Operating income (loss)	28.6	19.7	110.2	43.8
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(5.8)	(11.9)	(17.3)	(40.6)
Intersegment Eliminations | Services
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.1
Intersegment Eliminations | Technology
Segment Reporting Information [Line Items]
Revenue	5.8	11.9	17.3	40.5
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	44.1	51.5	142.4	81.4
Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	600.9	656.0	1,809.8	1,956.6
Operating Segments | Technology
Segment Reporting Information [Line Items]
Revenue	88.2	95.1	306.5	309.2
Corporate
Segment Reporting Information [Line Items]
Revenue	(5.8)	(11.9)	(17.3)	(40.6)
Operating income (loss)	$ (53.9)	$ (42.9)	$ (130.3)	$ (152.3)