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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]
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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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