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Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Dec. 31, 2011 TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Database and credit files [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Apr. 30, 2012 Database and credit files [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Dec. 31, 2011 Database and credit files [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Internally developed software [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Apr. 30, 2012 Internally developed software [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Dec. 31, 2011 Internally developed software [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Customer relationships [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Apr. 30, 2012 Customer relationships [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Dec. 31, 2011 Customer relationships [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Trademarks, copyrights and patents [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Apr. 30, 2012 Trademarks, copyrights and patents [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Dec. 31, 2011 Trademarks, copyrights and patents [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Noncompete and other agreements [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Apr. 30, 2012 Noncompete and other agreements [Member] TransUnion Corp-Successor [Member] TransUnion Holding Company, Inc. [Member] | Dec. 31, 2011 Noncompete and other agreements [Member] TransUnion Corp-Predecessor [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross | $ 1,998.2 | $ 605.4 | $ 763.6 |  | $ 272.4 | $ 380.3 |  | $ 241.8 | $ 306.7 |  | $ 60.0 | $ 545.5 |  | $ 24.4 | $ 2.1 |  | $ 6.8
Accumulated Amortization | (86.6) | (374.6) | (33.9) | 0 | (205.3) | (34.8) | 0 | (148.4) | (10.3) | 0 | (13.8) | (7.4) | 0 | (6.5) | (0.2) | 0 | (0.6)
Total future amortization expense | $ 1,911.6 | $ 230.8 | $ 729.7 |  | $ 67.1 | $ 345.5 |  | $ 93.4 | $ 296.4 |  | $ 46.2 | $ 538.1 |  | $ 17.9 | $ 1.9 |  | $ 6.2

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