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Summary of Operations by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 739.2	$ 882.5	$ 2,225.2	$ 2,450.6
Operating income	8.6	76.6	(70.9)	72.5
Operating Segments
Segment Reporting Information [Line Items]
Revenue	739.2	882.5	2,225.2	2,450.6
Operating income	51.5	92.2	81.4	119.0
Corporate
Segment Reporting Information [Line Items]
Operating income	(42.9)	(15.6)	(152.3)	(46.5)
Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(11.9)	(9.0)	(40.6)	(22.9)
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Revenue	(11.9)	(9.0)	(40.6)	(22.9)
Services
Segment Reporting Information [Line Items]
Revenue	656.0	711.9	1,956.5	2,097.0
Operating income	31.8	36.5	37.6	72.5
Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue			0.1	0.3
Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	656.0	711.9	1,956.6	2,097.3
Technology
Segment Reporting Information [Line Items]
Revenue	83.2	170.6	268.7	353.6
Operating income	19.7	55.7	43.8	46.5
Technology | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	11.9	9.0	40.5	22.6
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 95.1	$ 179.6	$ 309.2	$ 376.2

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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