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Selected Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 474.8	$ 425.7	$ 929.7	$ 831.4
Operating Income (Loss)	115.5	63.5	216.6	115.4
U.S. Information Services
Segment Reporting Information [Line Items]
Operating Income (Loss)	83.7	41.4	156.0	71.6
International
Segment Reporting Information [Line Items]
Operating Income (Loss)	12.6	8.1	21.5	13.1
Consumer Interactive
Segment Reporting Information [Line Items]
Operating Income (Loss)	49.7	43.6	97.7	84.0
Corporate
Segment Reporting Information [Line Items]
Operating Income (Loss)	(30.5)	(29.5)	(58.6)	(53.3)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(15.8)	(15.2)	(31.4)	(30.3)
Operating Income (Loss)	0.0	0.0	0.0	0.0
Intersegment Eliminations [Member] | U.S. Information Services
Segment Reporting Information [Line Items]
Revenue	(14.7)	(14.2)	(29.1)	(28.4)
Operating Income (Loss)	(14.3)	(13.8)	(28.4)	(27.7)
Intersegment Eliminations [Member] | International
Segment Reporting Information [Line Items]
Revenue	(1.1)	(1.0)	(2.2)	(1.9)
Operating Income (Loss)	(0.8)	(0.7)	(1.6)	(1.4)
Intersegment Eliminations [Member] | Consumer Interactive
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Operating Income (Loss)	15.1	14.6	30.0	29.1
Intersegment Eliminations [Member] | Corporate
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Segment Revenues Gross Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	490.6	440.9	961.1	861.8
Segment Revenues Gross Intersegment [Member] | U.S. Information Services
Segment Reporting Information [Line Items]
Revenue	297.9	256.8	580.1	503.8
Segment Revenues Gross Intersegment [Member] | International
Segment Reporting Information [Line Items]
Revenue	87.3	77.6	170.7	145.4
Segment Revenues Gross Intersegment [Member] | Consumer Interactive
Segment Reporting Information [Line Items]
Revenue	$ 105.4	$ 106.5	$ 210.3	$ 212.6

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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=63488584&loc=d3e20235-122688

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