Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	10 Months Ended	8 Months Ended	4 Months Ended	12 Months Ended
Dec. 31, 2012 TransUnion Holding Company, Inc. [Member]	Dec. 31, 2012 TransUnion Corp [Member] TransUnion Corp-Successor [Member]	Apr. 30, 2012 TransUnion Corp [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2011 TransUnion Corp [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2010 TransUnion Corp [Member] TransUnion Corp-Predecessor [Member]
Summary of components of income (loss) from continuing operations before income taxes
Domestic	$ (33.3)	$ 36.2	$ (79.5)	$ 0.2	$ 12.4
Foreign	36.0	36.0	15.6	66.9	70.6
Total income (loss) from continuing operations before income taxes	$ 2.7	$ 72.2	$ (63.9)	$ 67.1	$ 83.0

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 1(i)

-Article 4

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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