Summary of Operations by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 806.4	$ 858.6	$ 1,568.1	$ 1,668.5
Operating income (loss)	15.8	38.0	(4.1)	39.6
Operating Segments
Segment Reporting Information [Line Items]
Revenue	806.4	858.6	1,568.1	1,668.5
Operating income (loss)	30.5	61.5	26.9	84.3
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(14.7)	(23.5)	(31.0)	(44.7)
Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(13.8)	(16.9)	(23.4)	(34.2)
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Revenue	(13.8)	(16.9)	(23.4)	(34.2)
Services
Segment Reporting Information [Line Items]
Revenue	712.9	739.7	1,403.8	1,462.7
Operating income (loss)	28.5	29.2	41.9	51.8
Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	0.1	0.4	0.3	0.9
Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	713.0	740.1	1,404.1	1,463.6
Technology
Segment Reporting Information [Line Items]
Revenue	93.5	118.9	164.3	205.8
Operating income (loss)	2.0	32.3	(15.0)	32.5
Technology | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	13.7	16.5	23.1	33.3
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 107.2	$ 135.4	$ 187.4	$ 239.1