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SEGMENT INFORMATION (Operating Revenue and Operating Income by Operating Segment) (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Operating revenue	$ 678.1	$ 613.9	$ 1,329.9	$ 1,198.4
Operating income	188.5	167.4	342.7	319.3
Total assets	4,585.5		$ 4,585.5		$ 4,674.2
Number of reportable segments | segment			4
U.S. Information Solutions
Segment Reporting Information [Line Items]
Operating revenue	315.7	281.1	$ 614.4	542.3
Operating income	132.8	111.1	259.4	208.1
Total assets	1,962.3		1,962.3		1,983.9
International
Segment Reporting Information [Line Items]
Operating revenue	148.4	150.0	287.2	290.8
Operating income	29.5	32.8	57.5	61.8
Total assets	906.2		906.2		983.7
Workforce Solutions
Segment Reporting Information [Line Items]
Operating revenue	146.3	119.4	295.0	239.1
Operating income	56.0	40.5	116.0	79.2
Total assets	1,272.3		1,272.3		1,271.3
Personal Solutions
Segment Reporting Information [Line Items]
Operating revenue	67.7	63.4	133.3	126.2
Operating income	18.7	19.6	36.7	37.5
Total assets	122.3		122.3		123.8
General Corporate
Segment Reporting Information [Line Items]
Operating income	(48.5)	$ (36.6)	(126.9)	$ (67.3)
Total assets	$ 322.4		$ 322.4		$ 311.5

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