v2.4.0.6

Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended				10 Months Ended	12 Months Ended		4 Months Ended	8 Months Ended	12 Months Ended			8 Months Ended		12 Months Ended	4 Months Ended	12 Months Ended
	Apr. 30, 2012	Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Capital Loss Carryforward [Member]	Dec. 31, 2012 TransUnion Holding Company, Inc. [Member]	Dec. 31, 2012 TransUnion Holding Company, Inc. [Member]	Dec. 31, 2011 TransUnion Holding Company, Inc. [Member]	Apr. 30, 2012 TransUnion Corp [Member]	Dec. 31, 2012 TransUnion Corp [Member]	Dec. 31, 2011 TransUnion Corp [Member]	Dec. 31, 2010 TransUnion Corp [Member]	Dec. 31, 2012 TransUnion Corp-Successor Y	Dec. 31, 2012 TransUnion Corp-Successor TransUnion Corp [Member]	Dec. 31, 2011 TransUnion Corp-Successor TransUnion Corp [Member]	Dec. 31, 2012 TransUnion Corp-Predecessor [Member] Y	Apr. 30, 2012 TransUnion Corp-Predecessor [Member] TransUnion Corp [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member] TransUnion Corp [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member] TransUnion Corp [Member]
Income Taxes (Textual) [Abstract]
Total unrecognized tax benefits						$ 4.9	$ 4.9	$ 3.2		$ 4.8	$ 3.2			$ 4.8	$ 3.2			$ 3.2	$ 2.1
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						4.9	4.9			4.8	3.2
Effective tax rate						244.40%			18.00%	33.70%	26.50%	55.80%		33.70%			18.00%	26.50%	55.80%
U.S. federal statutory rate						35.00%	35.00%		35.00%	35.00%	35.00%	35.00%		35.00%			35.00%	35.00%	35.00%
Number of tax assessment year		2											1			1
Capital loss carryforwards will expire					3 years
Deferred Tax Liabilities, Undistributed Foreign Earnings						49.7	49.7							32.2				4.8
Income Taxes (Additional Textual) [Abstract]
Provision benefit for income taxes discontinued operations			0.1	2.9
Valuation allowance increased		10.3
Valuation allowance		27.2	16.9
Foreign loss and credit carryforwards will expire		10 years
Unremitted earnings from foreign subsidiaries	16.4
Accrued interest payable for taxes		0.5	0.5
Significant expense recognized, or significant liability recorded, for tax penalties		$ 0	$ 0

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The amount of estimated penalties recognized in the period arising from income tax examinations.

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This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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