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Selected Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 425.7	$ 378.5	$ 831.4	$ 731.6
Operating income (loss)	63.5	51.4	115.4	87.9
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(29.5)	(22.0)	(53.3)	(42.8)
Segment Revenues Gross Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	440.9	392.8	861.8	759.9
Segment Revenues Gross Intersegment [Member] | U.S. Information Services
Segment Reporting Information [Line Items]
Revenue	256.8	233.1	503.8	452.1
Segment Revenues Gross Intersegment [Member] | International
Segment Reporting Information [Line Items]
Revenue	77.6	67.5	145.4	131.0
Segment Revenues Gross Intersegment [Member] | Interactive [Member]
Segment Reporting Information [Line Items]
Revenue	106.5	92.2	212.6	176.8
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(15.2)	(14.3)	(30.3)	(28.3)
Operating income (loss)	0.0	0.0	0.0	0.0
Intersegment Eliminations [Member] | U.S. Information Services
Segment Reporting Information [Line Items]
Revenue	(14.2)	(13.5)	(28.4)	(26.8)
Operating income (loss)	(13.8)	(13.1)	(27.7)	(26.1)
Intersegment Eliminations [Member] | International
Segment Reporting Information [Line Items]
Revenue	(1.0)	(0.8)	(1.9)	(1.5)
Operating income (loss)	(0.7)	(0.5)	(1.4)	(0.9)
Intersegment Eliminations [Member] | Interactive [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Operating income (loss)	14.6	13.6	29.1	27.0
Segment Operating Income Gross Intersegment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	63.5	51.4	115.4	87.9
Segment Operating Income Gross Intersegment [Member] | U.S. Information Services
Segment Reporting Information [Line Items]
Operating income (loss)	41.4	38.4	71.6	66.1
Segment Operating Income Gross Intersegment [Member] | International
Segment Reporting Information [Line Items]
Operating income (loss)	8.1	1.9	13.1	4.6
Segment Operating Income Gross Intersegment [Member] | Interactive [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	$ 43.6	$ 33.2	$ 84.0	$ 59.9

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

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