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Investments in Affiliated Companies (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 12 Months Ended | 8 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 30, 2012 TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 TransUnion Corp-Predecessor [Member] | Apr. 30, 2012 TransUnion Corp-Predecessor [Member] Mexico [Member] | Apr. 30, 2012 TransUnion Corp-Predecessor [Member] India [Member] | Dec. 31, 2012 TransUnion Corp-Successor [Member] | Dec. 31, 2012 TransUnion Corp-Successor [Member] Mexico [Member] | Dec. 31, 2012 TransUnion Corp-Successor [Member] India [Member] | Apr. 30, 2012 Equity Method Investments [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 Equity Method Investments [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 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, 2010 Cost-method Investments [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Cost-method Investments [Member] TransUnion Corp-Successor [Member]
Investments in Affiliated Companies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share earnings of equity method investees |  |  |  | $ 4.1 | $ 11.4 | $ 8.4 | $ 2.3 | $ 0.6 | $ 8.0 | $ 4.4 | $ 1.4 |  |  |  |  |  |  |
Dividends received from equity method investments |  |  |  |  |  |  |  |  |  |  |  | 0.4 | 8.0 | 4.9 | 9.3 |  |  |
Dividends received from cost method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 | 0.5 | 0.6
Investments in Affiliated Companies (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership Interest | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairments of investments in affiliated companies | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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