SEGMENT INFORMATION (Operating Revenue and Operating Income by Operating 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]
Operating revenue	$ 613.9	$ 586.9	$ 1,198.4	$ 1,153.4
Operating income	167.4	158.1	319.3	307.1
U.S. Consumer Information Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	264.1	259.7	508.0	504.8
Operating income	109.5	104.3	204.3	196.2
International [Member]
Segment Reporting Information [Line Items]
Operating revenue	153.4	129.8	297.3	253.5
Operating income	33.4	37.2	62.8	71.9
Workforce Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	119.4	123.2	239.1	246.9
Operating income	40.5	38.3	79.2	75.7
North America Personal Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	54.0	51.5	108.1	102.6
Operating income	16.5	14.2	31.8	28.7
North America Commercial Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	23.0	22.7	45.9	45.6
Operating income	4.0	3.8	8.4	8.7
General Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating income	$ (36.5)	$ (39.7)	$ (67.2)	$ (74.1)