v2.4.0.6

Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	8 Months Ended	12 Months Ended		4 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 TransUnion Holding Company, Inc. [Member]	Dec. 31, 2012 TransUnion Holding Company, Inc. [Member]	Dec. 31, 2010 TransUnion Holding Company, Inc. [Member]	Apr. 30, 2012 TransUnion Corp-Predecessor [Member]	Dec. 31, 2011 TransUnion Corp-Predecessor [Member]	Dec. 31, 2010 TransUnion Corp-Predecessor [Member]	Dec. 31, 2009 TransUnion Corp-Predecessor [Member]
Stock option activity consisted of the following:
Beginning, Aggregate Intrinsic Value						$ 63.7
Beginning, Outstanding Shares					3,228,358	3,022,658
Shares, Granted		6,619,789			55,600	342,000	3,104,658
Weighted Average Exercise Price, Granted		$ 6.65			$ 44.47	$ 28.25	$ 24.37
Shares, Exercised				0	(2,100)	(6,500)
Weighted Average Exercise Price, Exercised					$ 24.37	$ 24.37
Shares, Forfeited		(86,980)			(71,004)	(129,200)	(82,000)
Weighted Average Exercise Price, Forfeited		$ 6.65			$ 26.35	$ 25.77	$ 24.37
Shares, Expired					(1,200)	(600)
Weighted Average Exercise Price, Expired					$ 24.37	$ 24.37
Shares, Cancelled					(3,209,654)
Weighted Average Exercise Price, Cancelled					$ 25.03
Ending, Outstanding Shares		6,532,809	6,532,809			3,228,358	3,022,658
Ending, Weighted Average Exercise Price		$ 6.65	$ 6.65			$ 24.72	$ 24.37
Ending, Weighted Average Remaining Contractual Term			9 years 8 months 12 days			8 years 7 months 6 days	9 years 6 months
Ending, Aggregate Intrinsic Value						63.7
Outstanding Shares Vested and expected to vest	6,115,889
Outstanding Vested and expected to vest Weighted Average Exercise Price	$ 6.65
Outstanding Vested and expected to vest Weighted Average Remaining Contractual Term	9 years 8 months 12 days
Outstanding Vested and expected to vest Aggregate Intrinsic Value
Shares, Exercisable Vested and expected to vest
Exercisable Vested and expected to vest, Weighted Average Exercise Price
Exercisable Vested and expected to vest, Weighted Average Remaining Contractual Term
Exercisable Vested and expected to vest, Aggregate Intrinsic Value

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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