SEGMENT INFORMATION (Operating Revenue and Operating Income by Operating Segment) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating revenue	$ 613.4	$ 572.0	$ 1,811.8	$ 1,725.4
Operating income	153.7	150.0	473.0	457.1
Total assets	4,707.1		4,707.1		4,539.9
U.S. Information Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	278.6	270.2	821.0	808.4
Operating income	104.3	97.7	312.4	298.1
Total assets	1,987.4		1,987.4		1,979.1
International [Member]
Segment Reporting Information [Line Items]
Operating revenue	158.4	134.5	467.2	400.2
Operating income	37.1	40.7	104.5	117.2
Total assets	918.0		918.0		629.7
Workforce Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	122.5	115.0	361.6	361.9
Operating income	39.8	34.5	119.0	110.2
Total assets	1,279.4		1,279.4		1,295.5
North America Personal Solutions [Member]
Segment Reporting Information [Line Items]
Operating revenue	53.9	52.3	162.0	154.9
Operating income	17.0	13.7	48.8	42.4
Total assets	47.2		47.2		42.9
General Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating income	(44.5)	(36.6)	(111.7)	(110.8)
Total assets	$ 475.1		$ 475.1		$ 592.7