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Financial Statements of Guarantors (Details 2) (USD $) In Millions, unless otherwise specified | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2012 TransUnion Corp-Successor [Member] | Apr. 30, 2012 TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Parent TransUnion Corp. [Member] TransUnion Corp-Successor [Member] | Apr. 30, 2012 Parent TransUnion Corp. [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 Parent TransUnion Corp. [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 Parent TransUnion Corp. [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Issuers Trans Union LLC and TransUnion Financing Corporation [Member] TransUnion Corp-Successor [Member] | Apr. 30, 2012 Issuers Trans Union LLC and TransUnion Financing Corporation [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 Issuers Trans Union LLC and TransUnion Financing Corporation [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 Issuers Trans Union LLC and TransUnion Financing Corporation [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Guarantor Subsidiaries [Member] TransUnion Corp-Successor [Member] | Apr. 30, 2012 Guarantor Subsidiaries [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 Guarantor Subsidiaries [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 Guarantor Subsidiaries [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Non-Guarantor Subsidiaries [Member] TransUnion Corp-Successor [Member] | Apr. 30, 2012 Non-Guarantor Subsidiaries [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 Non-Guarantor Subsidiaries [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 Non-Guarantor Subsidiaries [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2012 Eliminations [Member] TransUnion Corp-Successor [Member] | Apr. 30, 2012 Eliminations [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2011 Eliminations [Member] TransUnion Corp-Predecessor [Member] | Dec. 31, 2010 Eliminations [Member] TransUnion Corp-Predecessor [Member]
Consolidating Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 47.9 | $ (52.4) | $ 48.8 | $ 44.9 | $ 43.0 | $ (54.9) | $ 40.8 | $ 36.6 | $ 61.5 | $ (51.8) | $ 42.9 | $ 37.6 | $ 26.5 | $ 10.0 | $ 20.0 | $ 14.3 | $ 32.4 | $ 18.0 | $ 69.7 | $ 65.3 | $ (115.5) | $ 26.3 | $ (124.6) | $ (108.9)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (22.7) | 2.5 | (14.5) | 9.4 | (20.7) | 2.2 | (12.9) | 8.6 | (20.7) | 2.2 | (12.9) | 8.6 |  |  |  |  | (22.7) | 2.5 | (14.5) | 9.4 | 41.4 | (4.4) | 25.8 | (17.2)
Net unrealized loss on hedges | (3.7) |  |  | (1.1) | (3.7) |  |  | (1.1) | (3.7) |  |  | (1.1) |  |  |  |  |  |  |  |  | 3.7 |  |  | 1.1
Total other comprehensive income (loss), net of tax | (26.4) | 2.5 | (14.5) | 8.3 | (24.4) | 2.2 | (12.9) | 7.5 | (24.4) | 2.2 | (12.9) | 7.5 |  |  |  |  | (22.7) | 2.5 | (14.5) | 9.4 | 45.1 | (4.4) | 25.8 | (16.1)
Comprehensive income (loss) | 21.5 | (49.9) | 34.3 | 53.2 | 18.6 | (52.7) | 27.9 | 44.1 | 37.1 | (49.6) | 30.0 | 45.1 | 26.5 | 10.0 | 20.0 | 14.3 | 9.7 | 20.5 | 55.2 | 74.7 | (70.4) | 21.9 | (98.8) | (125.0)
Less: comprehensive income attributable to noncontrolling interests | (2.9) | (2.8) | (6.4) | (9.1) |  |  |  |  |  |  |  |  |  |  |  |  | (2.9) | (2.8) | (6.4) | (9.1) |  |  |  |
Comprehensive income (loss) attributable to TransUnion Corp and TransUnion Holding Company, Inc. | $ 18.6 | $ (52.7) | $ 27.9 | $ 44.1 | $ 18.6 | $ (52.7) | $ 27.9 | $ 44.1 | $ 37.1 | $ (49.6) | $ 30.0 | $ 45.1 | $ 26.5 | $ 10.0 | $ 20.0 | $ 14.3 | $ 6.8 | $ 17.7 | $ 48.8 | $ 65.6 | $ (70.4) | $ 21.9 | $ (98.8) | $ (125.0)

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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e557-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A + Details
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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591552-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition Net of tax and reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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