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Investments in Affiliated Companies (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011 TransUnion Corp-Predecessor [Member]	Dec. 31, 2012 TransUnion Corp-Successor [Member]	Dec. 31, 2011 Equity Method Investments [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2012 Equity Method Investments [Member] TransUnion Corp-Successor [Member]	Dec. 31, 2011 Cost-method Investments [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2012 Cost-method Investments [Member] TransUnion Corp-Successor [Member]
Summary of Investments in affiliated companies
Equity method investments			$ 34.8	$ 80.7
Cost method investments					7.9	7.9
Total investments in affiliated companies	$ 42.7	$ 88.6

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This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign.

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Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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