v2.4.0.6

Operating Segments (Details 5) (USD $) In Millions, unless otherwise specified	8 Months Ended					4 Months Ended	12 Months Ended		4 Months Ended	12 Months Ended		4 Months Ended	12 Months Ended		4 Months Ended	12 Months Ended		4 Months Ended	12 Months Ended
	Dec. 31, 2012 TransUnion Corp-Successor [Member]	Dec. 31, 2012 TransUnion Corp-Successor [Member] U.S. Information Services [Member]	Dec. 31, 2012 TransUnion Corp-Successor [Member] International [Member]	Dec. 31, 2012 TransUnion Corp-Successor [Member] Interactive [Member]	Dec. 31, 2012 TransUnion Corp-Successor [Member] Corporate [Member]	Apr. 30, 2012 TransUnion Corp-Predecessor [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member]	Apr. 30, 2012 TransUnion Corp-Predecessor [Member] U.S. Information Services [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member] U.S. Information Services [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member] U.S. Information Services [Member]	Apr. 30, 2012 TransUnion Corp-Predecessor [Member] International [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member] International [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member] International [Member]	Apr. 30, 2012 TransUnion Corp-Predecessor [Member] Interactive [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member] Interactive [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member] Interactive [Member]	Apr. 30, 2012 TransUnion Corp-Predecessor [Member] Corporate [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member] Corporate [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member] Corporate [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment	$ 115.0	$ 78.9	$ 25.8	$ 5.2	$ 5.1	$ 29.2	$ 85.3	$ 81.6	$ 22.3	$ 66.9	$ 63.7	$ 3.7	$ 7.8	$ 6.8	$ 1.3	$ 4.3	$ 4.8	$ 1.9	$ 6.3	$ 6.3

X

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration