Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 764.8	$ 806.4	$ 1,486.0	$ 1,568.1
Operating income (loss)	(49.5)	15.8	(79.5)	(4.1)
Operating Segments
Segment Reporting Information [Line Items]
Revenue	764.8	806.4	1,486.0	1,568.1
Operating income (loss)	33.8	30.5	29.9	26.8
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(83.3)	(14.7)	(109.4)	(30.9)
Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(22.0)	(7.8)	(28.7)	(13.9)
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Revenue	(22.0)	(7.8)	(28.7)	(13.9)
Services
Segment Reporting Information [Line Items]
Revenue	661.5	703.4	1,300.5	1,385.1
Operating income (loss)	14.3	25.6	5.8	36.0
Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	0.1	0.1	0.1	0.3
Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	661.6	703.5	1,300.6	1,385.4
Technology
Segment Reporting Information [Line Items]
Revenue	103.3	103.0	185.5	183.0
Operating income (loss)	19.5	4.9	24.1	(9.2)
Technology | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	21.9	7.7	28.6	13.6
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 125.2	$ 110.7	$ 214.1	$ 196.6