Operating Segments (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
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 U.S. Information Services [Member] TransUnion Corp-Successor [Member]	Apr. 30, 2012 U.S. Information Services [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2011 U.S. Information Services [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2010 U.S. Information Services [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2012 International [Member] TransUnion Corp-Successor [Member]	Apr. 30, 2012 International [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2011 International [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2010 International [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2012 Interactive [Member] TransUnion Corp-Successor [Member]	Apr. 30, 2012 Interactive [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2011 Interactive [Member] TransUnion Corp-Predecessor [Member]	Dec. 31, 2010 Interactive [Member] TransUnion Corp-Predecessor [Member]
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments	$ 8.0	$ 4.1	$ 11.4	$ 8.4	$ 0.9	$ 0.5	$ 1.1	$ (0.1)	$ 7.1	$ 3.6	$ 10.3	$ 8.5

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.12)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 6

-Subparagraph b

-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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 19

-Subparagraph c

-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.

+ Details