TransUnion (TRU) 10-K 30 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 28, 2015	Jun. 30, 2014
Document type	10-K
Amendment flag	FALSE
Document period end date	31-Dec-14
Document fiscal year focus	2014
Document fiscal period focus	FY
Entity registrant name	TransUnion
Entity central index key	1552033
Current fiscal year end date	-19
Entity filer category	Non-accelerated Filer
Entity well-known seasoned issuer	No
Entity voluntary filers	No
Entity current reporting status	Yes
Entity common stock, shares outstanding		110,968,015
Entity public float			$0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 15, 2012
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Current assets:
Cash and cash equivalents	$77.90	$111.20	$154.30	$0
Trade accounts receivable, net of allowance of $2.4 and $0.7	200.4	165
Other current assets	122.7	73.5
Total current assets	401	349.7
Property, plant and equipment, net of accumulated depreciation and amortization of $123.4 and $70.2	181.4	150.4
Goodwill	2,023.90	1,909.70	1,804.20
Other intangibles, net of accumulated amortization of $407.8 and $227.5	1,939.60	1,934
Other assets	119.9	148.5
Total assets	4,665.80	4,492.30
Current liabilities:
Trade accounts payable	106.5	100.3
Short-term debt and current portion of long-term debt	74	13.8
Other current liabilities	149.4	133.5
Total current liabilities	329.9	247.6
Long-term debt	2,865.90	2,853.10
Deferred taxes	676.8	636.9
Other liabilities	22.1	22.6
Total liabilities	3,894.70	3,760.20
Redeemable noncontrolling interests	23.4	17.6
Stockholders' equity:
Common stock, $0.01 par value; 200.0 million shares authorized at December 31, 2014 and December 31, 2013, 111.4 million and 110.7 million shares issued as of December 31, 2014 and December 31, 2013, respectively; and 110.9 million and 110.2 million shares outstanding as of December 31, 2014 and December 31, 2013, respectively	1.1	1.1
Additional paid-in capital	1,138	1,121.80
Treasury stock at cost; 0.5 million shares at December 31, 2014 and December 31, 2013	-4.3	-4.1
Accumulated deficit	-430.2	-417.7
Accumulated other comprehensive income (loss)	-117.5	-73.2	-24.4
Total Stockholders’ Equity Attributable to Parent	587.1	627.9
Noncontrolling interests	160.6	86.6
Total stockholders’ equity	747.7	714.5
Total liabilities and stockholders’ equity	$4,665.80	$4,492.30

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Trade accounts receivable, allowance	$2.40	$0.70
Property, plant and equipment, accumulated depreciation and amortization	123.4	70.2
Other intangibles accumulated amortization of	$407.80	$227.50
Common stock, par value	$0	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	111,400,000	110,700,000
Common stock, shares outstanding	110,900,000	110,200,000
Treasury stock at cost, shares	500,000	500,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended								10 Months Ended	12 Months Ended		4 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Revenue									$767	$1,304.70	$1,183.20
Operating expenses
Cost of services (exclusive of depreciation and amortization below)									298.2	499.1	472.4
Selling, general and administrative									212.6	436	354.8
Depreciation and amortization									115	241.2	186.8
Total operating expenses									625.8	1,176.30	1,014
Operating income (loss)	20.4	40.8	32.4	34.8	36.2	49.3	39.5	44.2	141.2	128.4	169.2
Non-operating income and expense
Interest expense									-125	-190	-197.6
Interest income									0.8	3.3	1.7
Earnings from equity method investments									8	12.5	13.7
Other income and (expense), net									-22.3	44	-12.9
Total non-operating income and expense									-138.5	-130.2	-195.1
Income (loss) before income taxes									2.7	-1.8	-25.9
(Provision) benefit for income taxes									-6.6	-2.6	-2.3
Net loss	-10.7	-0.1	19.9	-13.5	-15.7	-1.4	-6.1	-5	-3.9	-4.4	-28.2
Less: net income attributable to noncontrolling interests									-4.9	-8.1	-6.9
Net loss attributable to TransUnion	-13.1	-2.6	17.9	-14.7	-17.6	-3.4	-7.8	-6.3	-8.8	-12.5	-35.1
Earnings per share - basic	($0.12)	($0.02)	$0.16	($0.13)	($0.16)	($0.03)	($0.07)	($0.06)	($0.08)	($0.11)	($0.32)
Earnings per share - diluted	($0.12)	($0.02)	$0.16	($0.13)	($0.16)	($0.03)	($0.07)	($0.06)	($0.08)	($0.11)	($0.32)
Weighted average shares outstanding									109.7	110.5	109.9
Weighted average dilutive shares outstanding									109.7	110.5	109.9
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Revenue												373
Operating expenses
Cost of services (exclusive of depreciation and amortization below)												172
Selling, general and administrative												172
Depreciation and amortization												29.2
Total operating expenses												373.2
Operating income (loss)												-0.2
Non-operating income and expense
Interest expense												-40.5
Interest income												0.6
Earnings from equity method investments												4.1
Other income and (expense), net												-27.9
Total non-operating income and expense												-63.7
Income (loss) before income taxes												-63.9
(Provision) benefit for income taxes												11.5
Net loss												-52.4
Less: net income attributable to noncontrolling interests												-2.5
Net loss attributable to TransUnion												($54.90)
Earnings per share - basic												($1.84)
Earnings per share - diluted												($1.84)
Weighted average shares outstanding												29.8
Weighted average dilutive shares outstanding												29.8

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion Parent [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	($22.10)	($47.90)	($54.80)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	1.4	3.8	3
Other comprehensive income (loss), net of tax
Foreign currency translation, net	-20.7	-44.1	-51.8
Net unrealized gain (loss)	-5.9	-0.6	4.8
Amortization of accumulated loss	0	0.3	0
Benefit (provision) for income taxes	2.2	0.1	-1.8
Interest rate swaps, net	-3.7	-0.2	3
Net unrealized gain	0	0.2	0
Provision for income taxes	0	-0.1	0
Available-for-sale securities, net	0	0.1	0
Total other comprehensive income (loss), net of tax	-24.4	-44.2	-48.8
Comprehensive loss attributable to TransUnion	-51	-56.7	-66.1
TransUnion [Member] | TransUnion [Member]
Net loss	-3.9	-4.4	-28.2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	-24.2	-58.9	-59.6
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	1.5	5.2	3.2
Other comprehensive income (loss), net of tax
Foreign currency translation, net	-22.7	-53.7	-56.4
Net unrealized gain (loss)	-5.9	-0.6	4.8
Amortization of accumulated loss	0	0.3	0
Benefit (provision) for income taxes	2.2	0.1	-1.8
Interest rate swaps, net	-3.7	-0.2	3
Net unrealized gain	0	0.2	0
Provision for income taxes	0	-0.1	0
Available-for-sale securities, net	0	0.1	0
Total other comprehensive income (loss), net of tax	-26.4	-53.8	-53.4
Comprehensive loss	-30.3	-58.2	-81.6
Less: comprehensive income (loss) attributable to noncontrolling interests	-2.9	1.5	-2.3
Comprehensive loss attributable to TransUnion	-33.2	-56.7	-83.9
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Net loss				-52.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax				2.5
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax				0
Other comprehensive income (loss), net of tax
Foreign currency translation, net				2.5
Net unrealized gain (loss)				0
Amortization of accumulated loss				0
Benefit (provision) for income taxes				0
Interest rate swaps, net				0
Net unrealized gain				0
Provision for income taxes				0
Available-for-sale securities, net				0
Total other comprehensive income (loss), net of tax				2.5
Comprehensive loss				-49.9
Less: comprehensive income (loss) attributable to noncontrolling interests				-2.8
Comprehensive loss attributable to TransUnion				($52.70)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	4 Months Ended	10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Predecessor [Member] | Transunion Intermediate [Member]
Cash flows from operating activities:
Net income	($52.40)
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	29.2
Equity in net income of affiliates, net of dividends	-3.7
Deferred taxes	-18.3
Amortization of senior notes purchase accounting fair value adjustment and note discount	0
(Gains) / losses on sale of other assets	0.1
Loss on early extinguishment of debt	0
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	0
Cost-method Investments, Realized Gain (Loss)	0
Other Noncash Expense	0
Amortization of deferred financing fees	3.9
Stock-based compensation	2
Provision (reduction) for losses on trade accounts receivable	3.1
Change in control transaction fees	20.9
Other	-0.7
Changes in assets and liabilities:
Trade accounts receivable	-24.7
Other current and long-term assets	1.5
Trade accounts payable	1.6
Other current and long-term liabilities	89.9
Net cash provided by (Used in) operating activities	52.4
Payments for Repurchase of Other Equity	-1.3
Cash flows from investing activities:
Capital expenditures	-20.4
Purchases of trading securities	-1.1
Proceeds from Sale of Other Investments	0
Payments to Acquire Other Investments	0
Proceeds from sale of trading securities	1.1
Proceeds from sale of other assets	0
Acquisitions and purchases of noncontrolling interests, net of cash acquired	-0.1
Acquisition-related deposits, net	0
Other	0.9
Acquisition of noncontrolling interests in TransUnion Corp. subsidiaries	0
Cash (used in) provided by investing activities	-19.6
Cash flows from financing activities:
Proceeds from senior secured term loan	0
Extinguishment of senior secured term loan	0
Repayments of Unsecured Debt	0
Proceeds from revolving line of credit	0
Payment on revolving line of credit	0
Repayments of debt	-14.6
Debt financing fees	-6.1
Proceeds from issuance of common stock	0
Treasury stock purchases	-1.3
Change in control transaction fees	-20.9
Dividends to TransUnion Holding	0
Distributions to noncontrolling interests	-0.4
Other	-0.4
Cash provided by (used in) financing activities	-45
Effect of exchange rate changes on cash and cash equivalents	0.8
Net change in cash and cash equivalents	-11.4
Cash and cash equivalents	107.8
Cash and cash equivalents	96.4
Noncash investing activities & Noncash financing activities:
Property and equipment acquired through capital lease obligations	0
Noncash or Part Noncash Acquisition, Value of Assets Acquired	0
Exchange of TransUnion Holding Company, Inc. common stock for ownership interest in TransUnion Corp.	0
Cash paid during the year for:
Interest	12.7
Income taxes, net of refunds	5.6
Predecessor [Member] | Transunion Intermediate [Member] | 9.625% notes
Cash flows from financing activities:
Proceeds from notes	0
Predecessor [Member] | Transunion Intermediate [Member] | 8.125% notes
Cash flows from financing activities:
Proceeds from notes	0
TransUnion [Member] | TransUnion [Member]
Cash flows from operating activities:
Net income		-3.9	-4.4	-28.2
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation and amortization		115	241.2	186.8
Equity in net income of affiliates, net of dividends		1.3	-3.3	-3.6
Deferred taxes		-5.1	-20.8	-16.2
Amortization of senior notes purchase accounting fair value adjustment and note discount		-10.8	-5.8	-17.1
(Gains) / losses on sale of other assets		0	0	-1
Loss on early extinguishment of debt		0	-33.1	0
Gain (Loss) on Investments, Excluding Other than Temporary Impairments		0	-22.2	0
Cost-method Investments, Realized Gain (Loss)		0	4.1	0
Other Noncash Expense		0	0.6	0
Amortization of deferred financing fees		2.1	7.3	8.2
Stock-based compensation		2.7	8	6.3
Provision (reduction) for losses on trade accounts receivable		-1.9	3.2	0.8
Change in control transaction fees		0	0	0
Other		2.6	1.3	-0.9
Changes in assets and liabilities:
Trade accounts receivable		-1	-36.3	-3.1
Other current and long-term assets		-78.8	2	-8.6
Trade accounts payable		-0.8	6.1	5.9
Other current and long-term liabilities		25.6	6.4	14.1
Net cash provided by (Used in) operating activities		47	154.3	143.4
Payments for Repurchase of Other Equity		0	0	0
Cash flows from investing activities:
Capital expenditures		-48.8	-155.2	-81.7
Purchases of trading securities		-0.5	-2.1	-1.8
Proceeds from Sale of Other Investments		0	9.7	0
Payments to Acquire Other Investments		0	-15.1	0
Proceeds from sale of trading securities		0	1.5	4.4
Proceeds from sale of other assets		0	1	4.3
Acquisitions and purchases of noncontrolling interests, net of cash acquired		-14.2	-119.9	-282.3
Acquisition-related deposits, net		3.7	4.1	-10
Other		-1.4	0	0.1
Acquisition of noncontrolling interests in TransUnion Corp. subsidiaries		-1,485.90	0	0
Cash (used in) provided by investing activities		-1,547.10	-276	-367
Cash flows from financing activities:
Proceeds from senior secured term loan		0	1,895.30	1,133.40
Extinguishment of senior secured term loan		0	-1,120.50	-923.4
Repayments of Unsecured Debt		0	-645	0
Proceeds from revolving line of credit		0	78.5	65
Payment on revolving line of credit		0	-28.5	-65
Repayments of debt		-17.2	-25.6	-11.9
Debt financing fees		-41.3	-61.5	-5.2
Proceeds from issuance of common stock		1,097.30	9.6	5.8
Treasury stock purchases		-0.7	-0.2	-3.4
Change in control transaction fees		0	0	0
Dividends to TransUnion Holding		-373.8	0	0
Distributions to noncontrolling interests		-7.2	-10.4	-8
Other		0	0.2	0
Cash provided by (used in) financing activities		1,655.10	91.9	187.3
Effect of exchange rate changes on cash and cash equivalents		-0.7	-3.5	-6.8
Net change in cash and cash equivalents		154.3	-33.3	-43.1
Cash and cash equivalents		0	111.2	154.3
Cash and cash equivalents		154.3	77.9	111.2
Noncash investing activities & Noncash financing activities:
Property and equipment acquired through capital lease obligations		0	0	2
Noncash or Part Noncash Acquisition, Value of Assets Acquired		0	12.9	0
Exchange of TransUnion Holding Company, Inc. common stock for ownership interest in TransUnion Corp.		10.4	0	0
Cash paid during the year for:
Interest		140.4	191	211.8
Income taxes, net of refunds		14.9	25.2	23.3
TransUnion [Member] | TransUnion [Member] | 9.625% notes
Cash flows from financing activities:
Proceeds from notes		600	0	0
TransUnion [Member] | TransUnion [Member] | 8.125% notes
Cash flows from financing activities:
Proceeds from notes		$398	$0	$0

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	3 Months Ended		10 Months Ended	12 Months Ended		4 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012	Dec. 31, 2011
TransUnion [Member] | TransUnion [Member]
Earnings available to common shareholders	($13.10)	($17.60)	($8.80)	($12.50)	($35.10)
Consolidated Statement of Stockholders' Equity
Net income	-10.7	-15.7	-3.9	-4.4	-28.2
Other comprehensive loss			-26.4	-53.8	-53.4
Acquisition of noncontrolling interests in TransUnion Intermediate Holdings, Inc. subsidiaries			1,485.90	0	0
Balance	747.7	714.5		747.7	714.5
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Earnings available to common shareholders						-54.9
Consolidated Statement of Stockholders' Equity
Net income						-52.4
Other comprehensive loss						2.5
Acquisition of noncontrolling interests in TransUnion Intermediate Holdings, Inc. subsidiaries						0
Common Stock | TransUnion [Member] | TransUnion [Member]
Earnings available to common shareholders			0	0	0
Consolidated Statement of Stockholders' Equity
Other comprehensive loss			0	0	0
Purchase accounting adjustments related to acquisition of TransUnion Intermediate Holdings, Inc.			0		0
Stock-based compensation			0	0	0
Issuance of Stock Shares			110,200,000
Issuance of stock			1.1	0
Stock issued during period, shares, restricted stock award, forfeited					100,000
Issuance of stock, Shares				500,000	400,000
Purchase of noncontrolling interests			0	0	0
Exercise of stock options				0
Stock repurchased during period, shares				0	-400,000
Reclassification of redeemable non-controlling interests			0
Acquisition of subsidiary			0	0
Additional acquisition price for Brazil subsidiary			0		0
Dividends			0
Distributions to noncontrolling interests			0	0	0
Treasury stock purchased				0
Treasury stock purchased, shares			-100,000
Disposal of noncontrolling interests					0
Stockholder contribution				0
Balance	1.1	1.1	1.1	1.1	1.1
Balance, shares	110,900,000	110,200,000	110,100,000	110,900,000	110,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				200,000
Common Stock | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Earnings available to common shareholders						0
Consolidated Statement of Stockholders' Equity
Other comprehensive loss						0
Stock-based compensation						0
Stock issued during period, shares, restricted stock award, forfeited						0
Impact of share-based awards modification						0
Distributions to noncontrolling interests						0
Effects of merger transaction						0
Balance						0.3	0.3
Balance, shares						29,800,000	29,800,000
Paid-In Capital | TransUnion [Member] | TransUnion [Member]
Earnings available to common shareholders				0
Consolidated Statement of Stockholders' Equity
Other comprehensive loss				0
Stock-based compensation			2.7	8	6.3
Issuance of stock			1,106.60	8.5	5.2
Purchase of noncontrolling interests			0.1	-1.4	0.3
Exercise of stock options				1.1	0.6
Acquisition of subsidiary				0
Distributions to noncontrolling interests				0
Treasury stock purchased				0
Stockholder contribution				0
Balance	1,138	1,121.80	1,109.40	1,138	1,121.80
Paid-In Capital | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Consolidated Statement of Stockholders' Equity
Stock-based compensation						2
Exercise of stock options						0.1
Impact of share-based awards modification						-3.3
Balance						892.7	893.9
Treasury Stock | TransUnion [Member] | TransUnion [Member]
Earnings available to common shareholders				0
Consolidated Statement of Stockholders' Equity
Other comprehensive loss				0
Stock-based compensation				0
Issuance of stock				0
Purchase of noncontrolling interests				0
Exercise of stock options				0
Acquisition of subsidiary				0
Distributions to noncontrolling interests				0
Treasury stock purchased			-0.7	-0.2	-3.4
Stockholder contribution				0
Balance	-4.3	-4.1	-0.7	-4.3	-4.1
Treasury Stock | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Consolidated Statement of Stockholders' Equity
Treasury stock purchased						-1.3
Balance						-1.5	-0.2
Retained Earnings (Accumulated Deficit) | TransUnion [Member] | TransUnion [Member]
Earnings available to common shareholders				-12.5
Consolidated Statement of Stockholders' Equity
Net income			-8.8		-35.1
Other comprehensive loss				0
Stock-based compensation				0
Issuance of stock				0
Purchase of noncontrolling interests				0
Exercise of stock options				0
Acquisition of subsidiary				0
Dividends			-373.8
Distributions to noncontrolling interests				0
Treasury stock purchased				0
Stockholder contribution				0
Balance	-430.2	-417.7	-382.6	-430.2	-417.7
Retained Earnings (Accumulated Deficit) | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Consolidated Statement of Stockholders' Equity
Net income						-54.9
Effects of merger transaction						-0.4
Balance						-1,794.30	-1,739
Accumulated Other Comp Income (Loss) | TransUnion [Member] | TransUnion [Member]
Earnings available to common shareholders				0
Consolidated Statement of Stockholders' Equity
Other comprehensive loss			-24.4	-44.3	-48.8
Stock-based compensation				0
Issuance of stock				0
Purchase of noncontrolling interests				0
Exercise of stock options				0
Acquisition of subsidiary				0
Distributions to noncontrolling interests				0
Treasury stock purchased				0
Stockholder contribution				0
Balance	-117.5	-73.2	-24.4	-117.5	-73.2
Accumulated Other Comp Income (Loss) | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Consolidated Statement of Stockholders' Equity
Other comprehensive loss						2.2
Balance						-1.4	-3.6
Non-controlling Interests | TransUnion [Member] | TransUnion [Member]
Consolidated Statement of Stockholders' Equity
Net income			4.9
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest					6.8
Other comprehensive loss			-2	-7.5	-1.9
Acquisition of noncontrolling interests in TransUnion Intermediate Holdings, Inc. subsidiaries			26.6
Purchase accounting adjustments related to acquisition of TransUnion Intermediate Holdings, Inc.			87
Stock-based compensation				0
Issuance of stock				0
Purchase of noncontrolling interests				-2
Exercise of stock options				0
Reclassification of redeemable non-controlling interests			-17.9
Acquisition of subsidiary			1.9	85.1
Payments of ordinary dividends, noncontrolling interest			-7.2
Distributions to noncontrolling interests				-10.1	-7.8
Treasury stock purchased				0
Purchase accounting adjustments related to acquisition of TransUnion Corp. subsidiaries					-3.3
Disposal of noncontrolling interests					-0.6
Stockholder contribution				0.1	0.1
Balance	160.6	86.6	93.3	160.6	86.6
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest				8.4
Non-controlling Interests | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Consolidated Statement of Stockholders' Equity
Net income						2.5
Other comprehensive loss						0.3
Payments of ordinary dividends, noncontrolling interest						0.4
Balance						26.6	24.2
Stockholders' Equity, Total [Member] | TransUnion [Member] | TransUnion [Member]
Consolidated Statement of Stockholders' Equity
Net income			-3.9	-4.1	-28.3
Other comprehensive loss			-26.4	-51.8	-50.7
Acquisition of noncontrolling interests in TransUnion Intermediate Holdings, Inc. subsidiaries			26.6
Purchase accounting adjustments related to acquisition of TransUnion Intermediate Holdings, Inc.			87
Stock-based compensation			2.7	8	6.3
Issuance of stock			1,107.70	8.5	5.2
Purchase of noncontrolling interests			0.1	-3.4	0.3
Exercise of stock options				1.1	0.6
Reclassification of redeemable non-controlling interests			-17.9
Acquisition of subsidiary			1.9	85.1
Payments of ordinary dividends, noncontrolling interest			-7.2
Dividends			-373.8
Distributions to noncontrolling interests				-10.1	-7.8
Treasury stock purchased			-0.7	-0.2	-3.4
Purchase accounting adjustments related to acquisition of TransUnion Corp. subsidiaries					-3.3
Disposal of noncontrolling interests					-0.6
Stockholder contribution				0.1	0.1
Balance	747.7	714.5	796.1	747.7	714.5
Stockholders' Equity, Total [Member] | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Consolidated Statement of Stockholders' Equity
Net income						-52.4
Other comprehensive loss						2.5
Stock-based compensation						2
Exercise of stock options						0.1
Impact of share-based awards modification						-3.3
Payments of ordinary dividends, noncontrolling interest						0.4
Treasury stock purchased						-1.3
Effects of merger transaction						-0.4
Balance						-877.6	-824.4
Redeemable Non-controlling Interests (Temporary Equity) | TransUnion [Member] | TransUnion [Member]
Consolidated Statement of Stockholders' Equity
Net income					0.1
Other comprehensive loss				-2	-2.7
Purchase accounting adjustments related to acquisition of TransUnion Intermediate Holdings, Inc.			-0.3
Stock-based compensation				0
Issuance of stock				0
Purchase of noncontrolling interests			-3.3	0	-1.9
Exercise of stock options				0
Reclassification of redeemable non-controlling interests			17.9
Acquisition of subsidiary				8.4	7.6
Additional acquisition price for Brazil subsidiary			0.4
Distributions to noncontrolling interests				-0.3	-0.2
Treasury stock purchased				0
Stockholder contribution				0
Balance	23.4	17.6	14.7	23.4	17.6
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest				($0.30)

Significant_Accounting_and_Rep

Significant Accounting and Reporting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant accounting and reporting policies	Significant Accounting and Reporting Policies
	Description of Business
	TransUnion is a leading global risk and information solutions provider. Our mission is to help people worldwide access opportunities that lead to a higher quality of life. We accomplish this by helping businesses optimize their risk-based decisions and by enabling consumers to better understand and manage their personal information. Businesses embed our solutions into their process workflows to manage risk and to drive better business outcomes. Consumers use our solutions to view their credit profiles and access analytical tools that help them understand and manage their personal financial information and take precautions against identity theft. We have deep domain expertise across a number of attractive industry verticals, including financial services, insurance and healthcare, as well as a global presence in over 30 countries across North America, Africa, Latin America and Asia.
	We obtain financial, credit, alternative credit, identity, bankruptcy, lien, judgment, insurance claims, automotive and other relevant information from over 90,000 data sources, including financial institutions, private databases and public records repositories. We refine, standardize and enhance this data using sophisticated algorithms to create proprietary databases. Our deep analytics expertise, which includes our people as well as tools such as predictive modeling and scoring, customer segmentation, benchmarking and forecasting, enables businesses and consumers to gain better insights into their risk and financial data. Our decisioning capability, which is generally delivered on a software-as-a-service platform, allows businesses to interpret data and apply their specific qualifying criteria to make decisions and take action with their customers. Collectively, our data, analytics and decisioning capabilities allow businesses to authenticate the identity of consumers, effectively determine the most relevant products for consumers, retain and cross-sell to existing consumers, identify and acquire new consumers and reduce loss from fraud. Similarly, our capabilities allow consumers to see how their credit profile have changed over time, understand the impact of financial decisions on their credit score and manage their personal financial information as well as to take precautions against identity theft.
	Basis of Presentation
	The accompanying consolidated financial statements of TransUnion (formerly known as TransUnion Holding Company, Inc.) and subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). Our consolidated financial statements reflect all adjustments which, in the opinion of management, are necessary for a fair presentation of the periods presented. All significant intercompany transactions and balances have been eliminated.
	TransUnion Holding Company, Inc. was formed on February 15, 2012, as a vehicle to acquire TransUnion Corp. on April 30, 2012. On March 26, 2015, TransUnion Holding Company, Inc. was renamed TransUnion and TransUnion Corp. was renamed TransUnion Intermediate Holdings, Inc. ("TransUnion Intermediate"). The historical financial statements and information are presented on a Successor and Predecessor basis. The historical financial information for TransUnion Intermediate reflects the consolidated results of TransUnion Intermediate and its subsidiaries prior to the 2012 Change in Control Transaction (the “Predecessor”). The historical financial information for TransUnion reflects the stand-alone results of its operations from its date of inception and the consolidated results of TransUnion Intermediate and its subsidiaries after April 30, 2012 (the “Successor”).
	Unless the context indicates otherwise, any reference in this report to the “Company,” “we,” “us,” and “our” refers to TransUnion with its direct and indirect subsidiaries, including TransUnion Intermediate, or to TransUnion Intermediate and its subsidiaries for periods prior to the forming of TransUnion.
	2012 Change in Control Transaction
	TransUnion was formed by affiliates of Advent International Corporation (“Advent”) and Goldman Sachs & Co. (“GS”) on February 15, 2012, as a vehicle to acquire 100% of the outstanding common stock of TransUnion Intermediate. On April 30, 2012, pursuant to an Agreement and Plan of Merger, TransUnion acquired TransUnion Intermediate. To partially fund the acquisition, TransUnion issued $600.0 million aggregate principal amount of 9.625%/10.375% senior PIK toggle notes due 2018 (9.625% notes). We refer to these transactions collectively as the “2012 Change in Control Transaction.”
	The 2012 Change in Control Transaction was accounted for using the acquisition method of accounting in accordance with Accounting Standards Codification (“ASC”) 805, Business Combinations, with the basis of the assets acquired and liabilities assumed recorded at fair value to reflect the purchase price.
	Subsequent Events
	Events and transactions occurring through the date of issuance of the financial statements have been evaluated by management, and when appropriate, recognized or disclosed in the consolidated financial statements.
	Principles of Consolidation
	The consolidated financial statements of TransUnion include the accounts of TransUnion and all of its majority-owned or controlled subsidiaries. Investments in unconsolidated entities in which the Company has at least a 20% ownership interest, or where it is able to exercise significant influence, are accounted for using the equity method. Nonmarketable investments in unconsolidated entities in which the Company has less than a 20% ownership interest, or where it is not able to exercise significant influence, are accounted for using the cost method and periodically reviewed for impairment.
	Use of Estimates
	The preparation of consolidated financial statements and related disclosures in accordance with GAAP requires management to make estimates and judgments that affect the amounts reported. We believe that the estimates used in preparation of the accompanying consolidated financial statements are reasonable, based upon information available to management at this time. These estimates and judgments affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the balance sheet date, as well as the amounts of revenue and expense during the reporting period. Estimates are inherently uncertain and actual results could differ materially from the estimated amounts.
	Change in Accounting Estimate
	Effective July 1, 2014, we revised the remaining useful lives of certain internal use software, equipment, leasehold improvement and corporate headquarters facility assets to align with the expected completion dates of our strategic initiatives to transform our technology infrastructure and corporate headquarters facility. As a result, depreciation and amortization expense increased by $17.5 million. The net of tax impact of this change decreased net income attributable to TransUnion by $11.2 million,or $0.10 per share.
	Reclassifications
	We have reclassified certain items, which are not material, that are presented in our prior period consolidated financial statements to conform to the current year’s presentation.
	Segments
	We manage our business and report our financial results in three operating segments: U.S. Information Services (“USIS”); International; and Consumer Interactive (formerly "Interactive"). We also report expenses for Corporate, which provides support services to each operating segment. Details of our segment results are discussed in Note 17, “Operating Segments.”
	Revenue Recognition and Deferred Revenue
	Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the pricing is fixed or determinable and the collectability is reasonably assured. For multiple element arrangements, we separate deliverables into units of accounting and recognize revenue for each unit of accounting based on evidence of each unit’s relative selling price to the total arrangement consideration, assuming all other revenue recognition criteria have been met.
	A significant portion of our revenue is derived from providing information services to our customers. This revenue is recognized when services are provided, assuming all criteria for revenue recognition are met. A smaller portion of our revenue relates to subscription-based contracts where a customer pays a predetermined fee for a predetermined, or unlimited, number of transactions or services during the subscription period. Revenue related to subscription-based contracts having a preset number of transactions is recognized as the services are provided, using an effective transaction rate as the actual transactions are completed. Any remaining revenue related to unfulfilled units is not recognized until the end of the related contract’s subscription period. Revenue related to subscription-based contracts having an unlimited volume is recognized straight-line over the contract term.
	Deferred revenue generally consists of amounts billed in excess of revenue recognized for the sale of data services, subscriptions and set up fees. Deferred revenue is included in other current liabilities.
	Costs of Services
	Costs of services include data acquisition and royalty fees, personnel costs related to our databases and software applications, consumer and call center support costs, hardware and software maintenance costs, telecommunication expenses, research and development costs and occupancy costs associated with the facilities where these functions are performed.
	Selling, General and Administrative Expenses
	Selling, general and administrative expenses include personnel-related costs for sales, administrative and management employees, costs for professional and consulting services, advertising and occupancy and facilities expense of these functions. Advertising costs are expensed as incurred. Advertising costs for the years ended December 31, 2014 and 2013, and from the date of inception through December 31, 2012 were $31.3 million, $32.3 million and $19.2 million, respectively. Advertising costs of TransUnion Intermediate Predecessor for the four months ended April 30, 2012 were $15.5 million.
	Stock-Based Compensation
	Compensation expense for all stock-based compensation awards is determined using the grant date fair value and includes an estimate for expected forfeitures. Expense is recognized on a straight-line basis over the requisite service period of the award, which is generally equal to the vesting period. The details of our stock-based compensation program are discussed in Note 15, “Stock-Based Compensation.”
	Income Taxes
	Deferred income tax assets and liabilities are determined based on the estimated future tax effects of temporary differences between the financial statement and tax basis of assets and liabilities, as measured by current enacted tax rates. The effect of a tax rate change on deferred tax assets and liabilities is recognized in operations in the period that includes the enactment date of the change. We periodically assess the recoverability of our deferred tax assets, and a valuation allowance is recorded against deferred tax assets if it is more likely than not that some portion of the deferred tax assets will not be realized. See Note 14, “Income Taxes,” for additional information.
	Foreign Currency Translation
	The functional currency for each of our foreign subsidiaries is generally that subsidiary’s local currency. We translate the assets and liabilities of foreign subsidiaries at the year-end exchange rate, and translate revenues and expenses at the monthly average rates during the year. We record the resulting translation adjustment as a component of other comprehensive income in stockholders’ equity.
	Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are included in the results of operations as incurred. The exchange rate loss for the years ended December 31, 2014 and December 31, 2013, was $1.1 million and $0.8 million, respectively. The exchange rate gain from the date of inception through December 31, 2012 was less than $0.1 million. The exchange rate gain of TransUnion Intermediate Predecessor for the four months ended April 30, 2012 was $0.2 million.
	Cash and Cash Equivalents
	We consider investments in highly liquid debt instruments with original maturities of three months or less to be cash equivalents.
	Trade Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts is based on our historical write-off experience, analysis of the aging of outstanding receivables, customer payment patterns and the establishment of specific reserves for customers in adverse financial condition or for existing contractual disputes. Adjustments to the allowance are recorded as a bad debt expense in selling, general and administrative expenses. Trade receivables are written off against the allowance when they are determined to be no longer collectible. We reassess the adequacy of the allowance for doubtful accounts each reporting period.
	Long-Lived Assets
	Property, Plant, Equipment and Intangibles
	Property, plant and equipment was adjusted to fair value on the date of the 2012 Change in Control Transaction. All subsequent purchases of property, plant and equipment have been recorded at cost. Property, plant and equipment is depreciated primarily using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements are generally depreciated over twenty years. Computer equipment and purchased software are depreciated over three to seven years. Leasehold improvements are depreciated over the shorter of the estimated useful life of the asset or the lease term. Other assets are depreciated over five to seven years. Intangibles, other than indefinite-lived intangibles, are amortized using the straight-line method over their economic life, generally three to forty years. Assets to be disposed of are separately presented in the consolidated balance sheet and reported at the lower of the carrying amount or fair value, less costs to sell, and are no longer depreciated. See Note 2, “Change in Control Transaction,” Note 5, “Property, Plant and Equipment,” and Note 7, “Intangible Assets,” for additional information about these assets.
	Internal Use Software
	We monitor the activities of each of our internal use software and system development projects and analyze the associated costs, making an appropriate distinction between costs to be expensed and costs to be capitalized. Costs incurred during the preliminary project stage are expensed as incurred. Many of the costs incurred during the application development stage are capitalized, including costs of software design and configuration, development of interfaces, coding, testing and installation of the software. Once the software is ready for its intended use, it is amortized on a straight-line basis over its useful life, generally three to seven years.
	Impairment of Long-Lived Assets
	We review long-lived assets that are subject to amortization for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized equal to the amount by which the carrying amount of the asset exceeds the fair value of the asset. No significant impairment charges were recorded during 2014, 2013, or 2012.
	Marketable Securities
	We classify our investments in debt and equity securities in accordance with our intent and ability to hold the investments. Held-to-maturity securities are carried at amortized cost, which approximates fair value, and are classified as either short-term or long-term investments based on the contractual maturity date. Earnings from these securities are reported as a component of interest income. Available-for-sale securities are carried at fair market value, with the unrealized gains and losses, net of tax, included in accumulated other comprehensive income. Trading securities are carried at fair value, with unrealized gains and losses included in income.
	At December 31, 2014 and 2013, the Company's marketable securities consisted of trading securities and available-for-sale securities. The trading securities relate to a nonqualified deferred compensation plan held in trust for the benefit of plan participants. The available-for-sale securities relate to foreign exchange-traded corporate bonds. There were no significant realized or unrealized gains or losses for these securities for any of the periods presented. We follow fair value guidance to measure the fair value of our financial assets as further described in Note 16, "Fair Value."
	We periodically review our marketable securities to determine if there is an other-than-temporary impairment on any security. If it is determined that an other-than-temporary decline in value exists, we write down the investment to its market value and record the related impairment loss in other income. There were no other-than-temporary impairments of marketable securities in 2014, 2013, or 2012.
	Goodwill and Other Indefinite-Lived Intangibles
	Goodwill and other indefinite-lived intangible assets are allocated to various reporting units, which are an operating segment or one level below an operating segment. We test goodwill and indefinite-lived intangible assets for impairment on an annual basis, in the fourth quarter, or on an interim basis if an indicator of impairment is present. For goodwill, we compare the fair value of each reporting unit to its carrying amount to determine if there is potential goodwill impairment. If the fair value of a reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the fair value of the goodwill within the reporting unit is less than the carrying value of its goodwill. For other indefinite-lived intangibles, we compare the fair value of the asset to its carrying value to determine if there is an impairment. If the fair value of the asset is less than its carrying value, an impairment loss is recorded. We use discounted cash flow techniques to determine the fair value of our reporting units and other indefinite-lived intangibles. See Note 6, “Goodwill,” and Note 7, “Intangible Assets,” for additional information about these assets.
	Benefit Plans
	We maintain a 401(k) defined contribution profit sharing plan for eligible employees. We provide a partial matching contribution and a discretionary contribution based on a fixed percentage of a participant’s eligible compensation. Contributions to this plan for the years ended December 31, 2014 and 2013, and from the date of inception through December 31, 2012, were $14.1 million, $12.4 million and $6.9 million, respectively. Contributions to this plan by TransUnion Intermediate Predecessor for the four months ended April 30, 2012, were $4.8 million. We also maintain a nonqualified deferred compensation plan for certain key employees. The deferred compensation plan contains both employee deferred compensation and company contributions. These investments are held in the TransUnion Rabbi Trust, and are included in marketable securities in the consolidated balance sheets. The assets held in the Rabbi Trust are for the benefit of the participants in the deferred compensation plan, but are available to our general creditors in the case of our insolvency. The liability for amounts due to these participants is included in other current liabilities and other liabilities in the consolidated balance sheets.
	Recently Adopted Accounting Pronouncements
	On July 18, 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exist. ASU No. 2013-11 provides guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses or tax credit carryforwards exist. ASU No. 2013-11 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. This guidance was adopted by the Company effective January 1, 2014, and did not result in a material change in the Company’s consolidated financial statements. See Note 14, "Income Taxes," for further details regarding the impact of this adoption.
	Recent Accounting Pronouncement Not Yet Adopted
	On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This comprehensive guidance will replace all existing revenue recognition guidance and is effective for annual reporting periods beginning after December 15, 2016, and interim periods therein. We are currently assessing the impact this guidance will have on our consolidated financial statements once it is adopted.
	On June 19, 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. This update clarifies the accounting for share-based awards with performance targets and is effective for years beginning after December 15, 2015. We are currently assessing the impact this guidance will have on our consolidated financial statements.

Change_in_Control_Transactions

Change in Control Transactions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Change in Control Transaction	Change in Control Transaction
	2012 Change in Control Transaction
	On April 30, 2012, TransUnion Intermediate was acquired by affiliates of Advent and GS, for the aggregate purchase price of $1,592.7 million, plus the assumption of existing debt. As a result, TransUnion Intermediate became a wholly-owned subsidiary of TransUnion. In connection with the acquisition, all existing stockholders of TransUnion Intermediate received cash consideration for their shares and all existing option holders received cash consideration based on the value of their options. To partially fund the acquisition, TransUnion issued $600.0 million aggregate principal amount of the 9.625% notes. At the time of the transaction, TransUnion was owned 49.5% by affiliates of Advent, 49.5% by affiliates of GS and 1% by members of management.
	Purchase Price Allocation
	The fair value of identifiable intangible assets acquired and liabilities assumed was based on many factors including an analysis of historical financial performance and estimates of future performance, and was determined using analytical approaches appropriate to the facts and circumstances, including discounted cash flow and market-based approaches. The allocation of the purchase price to the identifiable assets acquired and liabilities assumed as of April 30, 2012, consisted of the following:
	(in millions)	Fair Value
	Trade accounts receivable	$	162.4
	Property and equipment	112.9
	Identifiable intangible assets	1,986.40
	Goodwill(1)	1,794.80
	All other assets	302.3
	Total assets acquired	$	4,358.80
	Existing debt (including fair value adjustment)	(1,710.8		)
	All other liabilities	(945.4		)
	Noncontrolling interests	(109.9		)
	Net assets of acquired company	$	1,592.70
	(1)	For tax purposes, $128.8 million of goodwill is tax deductible.
	The excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired and liabilities assumed was recorded as goodwill. The purchase price of TransUnion Intermediate exceeded the fair value of the net assets acquired due primarily to growth opportunities and operational efficiencies.
	Identifiable Intangible Assets
	The fair values of the intangible assets acquired consisted of the following:
	(in millions)	Fair Value			Estimated
					Useful Life
	Database and credit files	$	765		15 years
	Technology and software	364.6			7 years
	Trade names and trademarks	546.1			40 years
	Customer relationships	308			20 years
	Other	2.7			5 years
	Total identifiable intangible assets	$	1,986.40
	The weighted-average useful life of identifiable intangible assets is approximately 21 years.
	Acquisition Costs
	The Company incurred $36.5 million of acquisition-related costs, including investment banker fees, legal fees, due diligence and other external costs recorded in other income and expense. Of this total, $15.6 million was incurred by the Successor and $20.9 million was incurred by the Predecessor. The Predecessor also incurred $2.7 million of loan fees for a bridge loan prior to the date of acquisition.

Business_Acquisitions

Business Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Acquisitions	Business Combinations
	TLO
	On December 16, 2013, we acquired a 100% ownership interest in certain net assets of TLO, LLC ("TLO") for $153.4 million in cash. TLO provides data solutions for identity authentication, fraud prevention, and debt recovery. The results of operations of this business have been included as part of the USIS segment in the accompanying consolidated statements of income since the date of acquisition.
	Purchase Price Allocation
	The fair value of the assets acquired and liabilities assumed consisted of the following:
	(in millions)	Fair Value
	Other current assets	$	0.3
	Property and equipment	6.8
	Identifiable intangible assets	83.1
	Goodwill(1)	69.2
	Total assets acquired	$	159.4
	Total liabilities assumed	(6.0		)
	Net assets of acquired company	$	153.4
	(1)	All of the goodwill is deductible for tax purposes.
	The excess of the purchase price over the fair value of the net assets acquired was recorded as goodwill. The purchase price of TLO exceeded the fair value of the net assets acquired due primarily to growth opportunities, synergies associated with its internal use software and our existing customer base and brand name, and other technological and operational synergies. Goodwill has been allocated to the USIS segment.
	Identifiable Intangible Assets
	The fair values of the intangible assets acquired consisted of the following:
	(in millions)		Fair Value		Estimated Useful Life
	Technology and software		$	45.8	7 years
	Trade names and trademarks		13.2		20 years
	Customer relationships		24.1		15 years
	Total identifiable intangible assets		$	83.1
	The weighted-average useful life of identifiable intangible assets is approximately 11 years.
	Acquisition Costs
	During 2013, the Company incurred $3.7 million of acquisition-related costs for TLO, including banking fees, legal fees, due diligence and other external costs, which were expensed and recorded in other income and expense in the fourth quarter of 2013. Additional TLO acquisition-related costs of $0.5 million were incurred and expensed during 2014.
	DHI
	On November 12, 2014, we acquired an 87.5% ownership interest in Drivers History Information Sales, LLC ("DHI"). DHI provides traffic violations and criminal court data. The results of operations of DHI, which are not material, have been included as part of our USIS segment in our consolidated statements of income since the date of acquisition.
	L2C
	On October 17, 2014, we increased our equity interest in L2C, Inc. ("L2C") from 11.6% to 100%. L2C provides predictive analytics using alternative data. The results of operations of L2C, which are not material, have been included as part of our USIS segment in our consolidated statements of income since the date we obtained control.
	CIBIL
	During 2014, we increased our equity interest in Credit Information Bureau (India) Limited (“CIBIL”) from 27.5% to 55.0%. This additional purchase gave us control and resulted in our consolidation of CIBIL. CIBIL's results of operations, which are not material, are included as part of our International segment in our consolidated statements of income since May 21, 2014, the date we obtained control. See Note 9, "Investments in Affiliated Companies," for additional information.
	eScan
	On September 4, 2013, we acquired 100% ownership of e-Scan Data Systems, Inc. ("eScan"), a business that provides services to healthcare providers to capture uncompensated care costs in their revenue management programs. This acquisition is in line with our strategic objective to invest in the growing healthcare industry. The results of operations of eScan, which are not material, have been included as part of our USIS segment in our consolidated statements of income since the date of the acquisition.
	ZipCode
	On March 1, 2013, we acquired 80% ownership in Data Solutions Serviços de Informática Ltda. (“ZipCode”), a Brazilian company that provides data enrichment and registry information services. This acquisition is in line with our strategic objective to invest in growing international regions. The results of operations of ZipCode, which are not material, have been included as part of our International segment in our consolidated statements of income since the date of the acquisition.

Other_Current_Assets

Other Current Assets	12 Months Ended
	Dec. 31, 2014
Prepaid Expense and Other Assets, Current [Abstract]
Other Current Assets	Other Current Assets
	Other current assets consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Deferred income tax assets	$	51.2	$	22.1
	Prepaid expenses	43.4		34.9
	Other investments	8.8		—
	Deferred financing fees	8.2		6.8
	Marketable securities	3		—
	Income taxes receivable	2.8		6.8
	Other	5.3		2.9
	Total other current assets	$	122.7	$	73.5
	Other investments are foreign non-negotiable certificates of deposit that we acquired with CIBIL. The majority of these certificates of deposits are in denominations of greater than $0.1 million. As of December 31, 2014, these investments were recorded at their carrying value.

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment
	Property, plant and equipment, including those acquired by capital lease, consisted of the following:
	(in millions)	December 31, 2014			December 31, 2013
	Computer equipment and furniture	$	153.1		$	107.8
	Building and building improvements	89			64.3
	Purchased software	59.5			45.3
	Land	3.2			3.2
	Total cost of property, plant and equipment	304.8			220.6
	Less: accumulated depreciation	(123.4		)	(70.2		)
	Total property, plant and equipment, net of accumulated depreciation	$	181.4		$	150.4
	Depreciation expense, including depreciation of assets recorded under capital leases, for the years ended December 31, 2014 and December 31, 2013, and from the date of inception through December 31, 2012, was $56.7 million, $44.0 million and $26.7 million, respectively. Depreciation expense for the Predecessor four months ended April 30, 2012, was $12.4 million.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2014
Goodwill [Abstract]
Goodwill	Goodwill
	Goodwill is tested for impairment at the reporting unit level on an annual basis, in the fourth quarter, or on an interim basis if changes in circumstances could reduce the fair value of a reporting unit below its carrying value. Our reporting units are consistent with our operating segments for the U.S. Information Services and Consumer Interactive segments. The reporting units for our International segment are the geographic regions of Africa, Canada, Latin America and Asia.
	Our impairment tests are performed using a discounted cash flow analysis that requires certain assumptions and estimates regarding economic factors and future profitability. Goodwill impairment tests performed during 2014, 2013 and 2012 resulted in no impairment. At December 31, 2014, there was no accumulated goodwill impairment loss.
	As a result of the 2012 Change in Control Transaction, the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired was recorded as goodwill. See Note 2, “2012 Change in Control Transaction.”
	Goodwill allocated to our segments as of December 31, 2014, December 31, 2013, and December 31, 2012, and the changes in the carrying amount of goodwill during those periods consisted of the following:
	(in millions)	USIS			International			Consumer Interactive			Total
	Balance, December 31, 2012	$	1,135.30		$	532.1		$	136.8		$	1,804.20
	Purchase accounting adjustments	(4.7		)	(3.8		)	(0.6		)	(9.1		)
	Acquisitions	125.9			25.4			—			151.3
	Tax deductible goodwill adjustment	—			(2.1		)	—			(2.1		)
	Foreign exchange rate adjustment	—			(33.9		)	—			(33.9		)
	Sale of Africa subsidiary	—			(0.7		)	—			(0.7		)
	Balance, December 31, 2013	$	1,256.50		$	517		$	136.2		$	1,909.70
	Purchase accounting adjustments	10.3			—			—			10.3
	Acquisitions	40.8			92.9			—			133.7
	Foreign exchange rate adjustment	—			(29.8		)	—			(29.8		)
	Balance, December 31, 2014	$	1,307.60		$	580.1		$	136.2		$	2,023.90
	As of December 31, 2014, our estimates of fair value for each reporting unit exceeded the carrying amount of the corresponding reporting unit. The estimated fair value of our Latin America reporting unit exceeded its carrying amount by 5%. A 10% increase in the discount rate or a 10% decrease in the estimated cash flows of the reporting unit could not have resulted in an impairment in any reporting unit other than the Latin America reporting unit.
	See Note 2, “Change in Control Transaction,” and Note 3, “Business Combinations,” for information on our purchase accounting adjustments and business acquisitions.

Intangible_Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets	Intangible Assets
	Intangible assets are initially recorded at their acquisition cost, or fair value if acquired as part of a business combination, and amortized over their estimated useful lives. Increases to the gross amount of intangible assets during 2014 included expenditures to develop internal use software and increases due to business acquisitions, partially offset by the impact of foreign exchange rate adjustments.
	Intangible assets consisted of the following:
		31-Dec-14							31-Dec-13
	(in millions)	Gross		Accumulated			Net		Gross		Accumulated			Net
				Amortization							Amortization
	Database and credit files	$	801.3	$	(135.8	)	$	665.5	$	761.8	$	(84.3	)	$	677.5
	Internal use software	580		(187.3		)	392.7		510.4		(94.7		)	415.7
	Customer relationships	392.4		(46.0		)	346.4		336.1		(25.8		)	310.3
	Trademarks, copyrights and patents	571.5		(37.9		)	533.6		550.7		(22.2		)	528.5
	Noncompete and other agreements	2.2		(0.8		)	1.4		2.5		(0.5		)	2
	Total intangible assets	$	2,347.40	$	(407.8	)	$	1,939.60	$	2,161.50	$	(227.5	)	$	1,934.00
	All amortizable intangibles are amortized on a straight-line basis over their estimated useful lives. Database and credit files are amortized over a twelve- to fifteen-year period. Internal use software is amortized over a three- to seven-year period. Customer relationships are amortized over a ten- to twenty-year period. Trademarks are generally amortized over a forty-year period. Copyrights, patents, noncompete and other agreements are amortized over varying periods based on their estimated economic life. The increase in gross intangible assets is primarily a result of business acquisitions during 2014. See Note 3, “Business Combinations,” for information on our business acquisitions.
	Amortization expense related to intangible assets for the years ended December 31, 2014 and 2013, and from inception through December 31, 2012, was $184.5 million, $142.8 million, and $88.3 million, respectively. Amortization expense for the Predecessor four months ended April 30, 2012, was $16.8 million.
	Estimated future amortization expense related to purchased intangible assets at December 31, 2014, is as follows:
	(in millions)	Annual
		Amortization
		Expense
	2015	$	214.3
	2016	180.1
	2017	146.2
	2018	134
	2019	115.6
	Thereafter	1,149.40
	Total future amortization expense	$	1,939.60

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Other Assets	Other Assets
	Other assets consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Investments in affiliated companies	$	52.8	$	92.4
	Deferred financing fees	25.8		29.7
	Other investments	18.8		—
	Deposits	11.5		15.8
	Marketable securities	10.9		9.9
	Other	0.1		0.7
	Total other assets	$	119.9	$	148.5
	The decrease in investments in affiliated companies was primarily due to our acquisition of a controlling equity interest in CIBIL, which we now consolidate. Other investments include foreign non-negotiable certificates of deposit that we acquired with CIBIL. The majority of these certificates of deposits are in denominations of greater than $0.1 million. As of December 31, 2014, these investments are recorded at their carrying value. See Note 3, "Business Combinations," and Note 9, "Investments in Affiliated Companies," for additional information regarding the CIBIL acquisition.

Investments_in_Affiliated_Comp

Investments in Affiliated Companies	12 Months Ended
	Dec. 31, 2014
Investments in Affiliated Companies [Abstract]
Investments in Affiliated Companies	Investments in Affiliated Companies
	Investments in affiliated companies represent our investment in non-consolidated domestic and foreign entities. These entities are in businesses similar to ours, such as credit reporting, credit scoring and credit monitoring services. These investments are included in other assets in the consolidated balance sheets.
	We use the equity method to account for investments in affiliates where we have at least a 20% ownership interest or where we are able to exercise significant influence. For these investments, we adjust the carrying value for our proportionate share of the affiliates’ earnings, losses and distributions, as well as for purchases and sales of our ownership interest.
	We use the cost method to account for nonmarketable investments in affiliates where we have less than a 20% ownership interest or where we are not able to exercise significant influence. For these investments, we adjust the carrying value for purchases and sales of our ownership interests.
	For all investments, we adjust the carrying value if we determine that an other-than-temporary impairment has occurred. During 2014, we incurred a loss of $4.1 million recorded in our USIS segment on a cost method investment that was liquidated. The loss was included in other income and expense in the consolidated statements of income. We had no impairments of investments in affiliated companies during 2013 or 2012.
	Investments in affiliated companies consisted of the following:
	(in millions)	December 31,			December 31,
		2014			2013
	Trans Union de Mexico, S.A. (25.69% ownership interest)	$	45		$	50
	Credit Information Bureau (India) Ltd. ("CIBIL", 27.5% ownership interest in 2013)	—			28.4
	All other equity method investments	6.9			6.1
	Total equity method investments	$	51.9		$	84.5
	Total cost method investments	0.9			7.9
	Total investments in affiliated companies	$	52.8		$	92.4
	These balances are included in other assets in the consolidated balance sheets.
	During 2014, we increased our equity interest in CIBIL to 55.0%, obtained control and began consolidating results of operations of CIBIL as part of our International segment. As a result, CIBIL is no longer an equity method investment.
	We remeasured our previously held equity interest in CIBIL at fair value as of the date we obtained control in accordance with the accounting guidance for acquisitions achieved in stages. As a result, we recognized a gain of $21.7 million in other income and expense in the second quarter of 2014.
	Earnings from equity method investments, which are included in other non-operating income and expense, and dividends received from equity method investments consisted of the following:
			Successor							Predecessor
	(in millions)		Twelve Months Ended December, 2014			Twelve Months Ended December, 2013		From the Date of		Four Months
								Inception through		Ended
								31-Dec-12		April 30, 2012
	Earnings from equity method investments		$	12.5		$	13.7	$	8	$	4.1
	Dividends received from equity method investments		$	9.2		$	10.1	$	9.3	$	0.4
	Under SEC Regulation S-X, Rule 4-08(g), our investment in TransUnion de Mexico, S.A. is considered a significant equity method investment. The summarized financial information and earnings for our equity method investments as required by SEC Regulation S-X, Rule 1-02(bb)(i) and (ii) consisted of the following:
	(in millions)		31-Dec-14			31-Dec-13
	Current assets		$	57.8		$	83
	Noncurrent assets		$	14.7		$	24.6
	Current liabilities		$	18		$	26.3
	Noncurrent liabilities		$	0.1		$	1.4
			Successor							Predecessor
	(in millions)		Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013		From the Date of Inception through December 31, 2012		Four Months Ended April 30, 2012
	Revenue		$	124.9		$	132.6	$	82.4	$	40.9
	Operating income		$	55.7		$	57.7	$	34.4	$	16.9
	Income from continuing operations		$	43.9		$	48.2	$	28.6	$	14.1
	Net income		$	43.9		$	48.2	$	28.6	$	14.1
	Dividends received from cost method investments were $0.8 million, $0.7 million, and $0.6 million in 2014 and 2013 and from the date of inception through December 31, 2012, respectively. We received no dividends from cost method investments for the four months ended April 30, 2012. Dividends received from cost method investments have been included in other income and expense.

Other_Current_Liabilities

Other Current Liabilities	12 Months Ended
	Dec. 31, 2014
Other Liabilities, Current [Abstract]
Other Current Liabilities	Other Current Liabilities
	Other current liabilities consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Accrued payroll	$	71.5	$	63.7
	Accrued interest	20.5		23.1
	Accrued legal and regulatory	17.8		13.8
	Accrued employee benefits	13		9.6
	Deferred revenue	8.6		9.1
	Other	18		14.2
	Total other current liabilities	$	149.4	$	133.5

Other_Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]
Other Liabilities	Other Liabilities
	Other liabilities consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Retirement benefits	$	10.8	$	10.4
	Unrecognized tax benefits	0.3		4.6
	Other	11		7.6
	Total other liabilities	$	22.1	$	22.6

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Instruments [Abstract]
Debt	Debt
	Debt outstanding consisted of the following:
	(in millions)	December 31,			December 31,
		2014			2013
	Senior secured term loan, payable in quarterly installments through April 9, 2021, including variable interest (4.00% at December 31, 2014) at LIBOR or alternate base rate, plus applicable margin, including original discount (premium) of $4.3 million and $(0.2) million at December 31, 2014, and December 31, 2013, respectively	$	1,881.50		$	1,123.50
	Senior secured revolving line of credit, due on April 9, 2019, variable interest (3.75% at December 31, 2014) at LIBOR or alternate base rate, plus applicable margin	50			—
	11.375% Senior Notes - Senior notes, principal due June 15, 2018, (paid in full in May 2014) semi-annual interest payments, 11.375% fixed interest per annum, including unamortized fair value adjustment of $95.9 million as of December 31, 2013	—			740.9
	9.625% Senior Notes - Senior unsecured PIK toggle notes, principal due June 15, 2018, semi-annual interest payments, 9.625% fixed interest per annum	600			600
	8.125% Senior Notes - Senior unsecured PIK toggle notes, principal due June 15, 2018, semi-annual interest payments, 8.125% fixed interest per annum, including original issuance discount of $1.3 million and $1.7 million at December 31, 2014, and December 31, 2013, respectively	398.7			398.3
	Other notes payable	7.4			—
	Capital lease obligations	2.3			4.2
	Total debt	$	2,939.90		$	2,866.90
	Less short-term debt and current portion of long-term debt	(74.0		)	(13.8		)
	Total long-term debt	$	2,865.90		$	2,853.10
	Excluding potential additional principal payments due on the senior secured credit facility based on excess cash flows of the prior year, scheduled future maturities of total debt at December 31, 2014, was as follows:
	(in millions)
	2015	$	74
	2016	23.4
	2017	19.4
	2018	1,019.00
	2019	19
	Thereafter	1,790.70
	Unamortized premiums and discounts on notes	(5.6		)
	Total	$	2,939.90
	Senior Secured Credit Facility
	On June 15, 2010, the Company entered into a senior secured credit facility with various lenders. The credit facility consists of a senior secured term loan and a senior secured revolving line of credit. On April 9, 2014, we refinanced and amended the senior secured credit facility. The refinancing resulted in an increase in the outstanding senior secured term loan from $1,120.5 million to $1,900.0 million. The amendment, among other things, reduced the interest rate floor and margins, reduced the amount available under the senior secured revolving line of credit from $210.0 million to $190.0 million, extended the maturity dates, and changed certain covenant requirements. The additional borrowings were used in part to repay all amounts outstanding under the existing senior secured revolving line of credit and pay fees and expenses associated with the refinancing transaction. On May 9, 2014, the remaining borrowings were used to redeem the entire $645.0 million outstanding balance of the 11.375% notes issued by TransUnion LLC and its wholly-owned subsidiary, TransUnion Financing Corporation, including a prepayment premium and unpaid accrued interest through June 15, 2014. We refer to these transactions collectively as the "2014 Refinancing Transaction." The early redemption of the 11.375% notes resulted in a net gain of $45.8 million recorded in other income and expense in the consolidated statements of income consisting of the unamortized 2012 Change in Control Transaction fair value increase in the notes of $89.4 million less an early redemption premium and other costs totaling $43.6 million. The senior secured credit facility refinancing resulted in $12.7 million of refinancing fees and other net costs expensed and recorded in other income and expense in the consolidated statements of income.
	Interest rates on the refinanced senior secured term loan are based on the London Interbank Offered Rate (“LIBOR”) unless otherwise elected, and subject to a floor of 1.00%, plus a margin of 2.75% or 3.00% depending on our senior secured net leverage ratio. Under the refinanced senior secured term loan, the Company is required to make principal payments of 0.25% of the refinanced original principal balance at the end of each quarter, with the remaining balance due April 9, 2021. The Company will also be required to make additional payments beginning in 2015 based on excess cash flows of the prior year. Depending on the senior secured net leverage ratio for the year, a principal payment of between zero and fifty percent of the excess cash flows will be due the following year.
	During the fourth quarter of 2014, the Company borrowed $50.0 million against the senior secured revolving line of credit to partially fund acquisitions. As of December 31, 2014, the entire $50.0 million borrowed against the senior secured revolving line of credit remained outstanding.
	Interest rates on the refinanced senior secured revolving line of credit are based on LIBOR unless otherwise elected, and subject to a floor of 1.00%, plus a margin of 2.50% or 2.75% depending on our senior secured net leverage ratio. There is a 0.375% or 0.50% annual commitment fee, depending on our senior secured net leverage ratio, payable quarterly based on the undrawn portion of the senior secured revolving line of credit. The commitment under the senior secured revolving line of credit expires on April 9, 2019.
	With certain exceptions, the obligations are secured by a first-priority security interest in substantially all of the assets of Trans Union LLC, including its investment in subsidiaries. The senior secured credit facility contains various restrictions and nonfinancial covenants, along with a senior secured net leverage ratio test. The nonfinancial covenants include restrictions on dividends, investments, dispositions, future borrowings and other specified payments, as well as additional reporting and disclosure requirements. We are in compliance with all of the loan covenants.
	On April 30, 2012, we entered into swap agreements that effectively fixed the interest payments on a portion of the then existing senior secured term loan at 2.033%, plus the applicable margin, beginning March 28, 2013. Under the swap agreements, which we had designated as cash flow hedges, we pay a fixed rate of interest of 2.033% and receive a variable rate of interest equal to the greater of 1.50% or the three-month LIBOR. The net amount paid or received was recorded as an adjustment to interest expense. As a result of the April 9, 2014, senior secured credit facility amendment, the swaps were no longer expected to be highly effective and no longer qualify for hedge accounting. The total fair value of the swap instruments as of April 9, 2014, of $1.6 million was recorded in other liabilities in the consolidated balance sheet. The corresponding net of tax loss of $1.0 million was recorded in accumulated other comprehensive income and is being amortized to interest expense on a straight-line basis through December 29, 2017, the remaining life of the swaps. Changes in the fair value of the swaps after April 9, 2014 through December 31, 2014, resulted in a loss of $0.3 million recorded in other income and expense.
	11.375% Senior Notes
	Trans Union LLC and its wholly-owned subsidiary TransUnion Financing Corporation issued $645.0 million principal amount of 11.375% senior unsecured notes due June 15, 2018. On May 9, 2014, the 11.375% notes were fully repaid using proceeds received on the new senior secured term loan.
	9.625% Senior Notes
	On March 21, 2012, the Company issued $600.0 million principal amount of 9.625%/10.375% senior unsecured PIK toggle notes (“9.625% Senior Notes”) due June 15, 2018, in a private placement to certain investors. Pursuant to an exchange offer completed in October 2012, these notes were subsequently registered with the SEC. The Company is required to pay interest on the 9.625% Senior Notes in cash unless certain conditions described in the indenture governing the notes are satisfied, in which case the Company will be entitled to pay interest for such period by increasing the principal amount of the notes or by issuing new notes (such increase being referred to as “PIK,” or paid-in-kind interest) to the extent described in the indenture.
	The indenture governing the 9.625% Senior Notes contains nonfinancial covenants that include restrictions on our ability to pay dividends or distributions, repurchase equity, prepay junior debt, make certain investments, incur additional debt, issue certain stock, incur liens on property, merge, consolidate or sell certain assets, enter into transactions with affiliates, and allow to exist certain restrictions on the ability of subsidiaries to pay dividends or make other payments to TransUnion. We are in compliance with all covenants under the indenture.
	8.125% Senior Notes
	On November 1, 2012, the Company issued $400.0 million principal amount of 8.125%/8.875% senior unsecured PIK toggle notes (“8.125% Senior Notes”) due June 15, 2018, at an offering price of 99.5% in a private placement to certain investors. Pursuant to an exchange offer completed in August 2013, these notes were subsequently registered with the SEC. The Company is required to pay interest on the 8.125% Senior Notes in cash unless certain conditions described in the indenture governing the notes are satisfied, in which case the Company will be entitled to pay interest for such period by increasing the principal amount of the notes or by issuing new notes to the extent described in the indenture.
	The indenture governing the 8.125% Senior Notes and the nonfinancial covenants are substantially identical to those governing the 9.625% notes. We are in compliance with all covenants under the indenture.
	Fair Value of Debt
	The estimated fair values of our 9.625% and 8.125% Senior Notes as of December 31, 2014, were $613.7 million and $410.2 million, respectively, compared with book values of $600.0 million and $398.7 million, respectively. The fair values of these fixed-rate notes, as determined under Level 2 of the fair-value hierarchy, are measured using quoted market prices of these publicly traded securities. The book value of our variable-rate debt approximates its fair value. The estimated fair value of our debt may not represent the actual settlement value due to redemption premiums and prepayment penalties that we may incur in connection with extinguishing our debt before its stated maturity.

Earnings_per_share

Earnings per share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	Basic earnings per share represents income available to common stockholders divided by the weighted average number of common shares outstanding during the reported period. Diluted earnings per share reflects the effect of the increase in shares outstanding determined by using the treasury stock method for awards issued under our long-term incentive stock plans. There were 7.7 million, 7.1 million, and 6.5 million anti-dilutive stock-based awards outstanding at December 31, 2014, December 31, 2013, and December 31 2012, respectively, including contingently issuable market-based stock options. These awards were excluded from the computation of diluted earnings per share because their effect would have been anti-dilutive. Basic and diluted weighted average shares outstanding and earnings per share for the years ended December 31, 2014 and 2013, from the date of inception through December 31, 2012, and four months ended April 30, 2012, were as follows:
		Successor									Predecessor
	(in millions)	Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013			From the Date of Inception through December 31, 2012			Four Months Ended April 30, 2012
	Earnings per share - basic
	Earnings available to common shareholders	$	(12.5	)	$	(35.1	)	$	(8.8	)	$	(54.9	)
	Weighted average shares outstanding	110.5			109.9			109.7			29.8
	Earnings per share - basic	$	(0.11	)	$	(0.32	)	$	(0.08	)	$	(1.84	)
	Earnings per share - diluted
	Earnings available to common shareholders	$	(12.5	)	$	(35.1	)	$	(8.8	)	$	(54.9	)
	Weighted average shares outstanding	110.5			109.9			109.7			29.8
	Dilutive impact of stock based awards	—			—			—			—
	Weighted average dilutive shares outstanding	110.5			109.9			109.7			29.8
	Earnings per share - diluted	$	(0.11	)	$	(0.32	)	$	(0.08	)	$	(1.84	)

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The provision (benefit) for income taxes on income (loss) from operations consisted of the following:
		Successor											Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013			From Date of Inception Through December 31, 2012				Four Months Ended April 30,
													2012
	Federal
	Current	$	(0.1	)		$	0.1		$	0.1			$	1
	Deferred	(15.9		)		(15.5		)	(3.0		)		(16.1		)
	State
	Current	0.4				—			(0.5		)		0.1
	Deferred	0.1				(0.3		)	(0.3		)		(1.5		)
	Foreign
	Current	23.1				18.4			12.1				5.7
	Deferred	(5.0		)		(0.4		)	(1.8		)		(0.7		)
	Total provision (benefit) for income taxes	$	2.6			$	2.3		$	6.6			$	(11.5	)
	The components of income (loss) from operations before income taxes consisted of the following:
		Successor											Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013			From Date of Inception Through December 31, 2012				Four Months Ended April 30,
													2012
	Domestic	$	(54.1	)		$	(72.9	)	$	(33.3	)		$	(79.5	)
	Foreign	52.3				47			36				15.6
	Total income (loss) from operations before income taxes	$	(1.8	)		$	(25.9	)	$	2.7			$	(63.9	)
	The effective income tax rate reconciliation consisted of the following:
			Successor																	Predecessor
	(in millions)		Twelve Months Ended December 31, 2014						Twelve Months Ended December 31, 2013						From Date of Inception Through December 31, 2012					Four Months Ended April 30, 2012
	Income taxes at 35% statutory rate		$	(0.6	)		35	%	$	(9.1	)	35	%		$	0.9		35	%	$	(22.4	)	35	%
	Increase (decrease) resulting from:
	State taxes		0.4				(23.9	)%	(0.1		)	0.4	%		(0.9		)	(35.0	)%	(1.4		)	2.2	%
	Foreign rate differential		(1.8		)		98.7	%	(0.9		)	3.5	%		(4.0		)	(148.1	)%	(1.2		)	1.9	%
	Change in control transaction expenses		—				—		—			—			1.8			66.7	%	2.7			(4.2	)%
	Application of indefinite reinvestment assertion to to foreign earnings		5.6				(308.4	)%	15.1			(58.0	)%		4.3			159.2	%	8.1			(12.7	)%
	Impact of foreign dividends		—				(1.6	)%	(1.7		)	6.4	%		5			185.2	%	2			(3.1	)%
	Other		(1.0		)		56	%	(1.0		)	3.9	%		(0.5		)	(18.6	)%	0.7			(1.1	)%
	Total		$	2.6			(144.2	)%	$	2.3		(8.8	)%		$	6.6		244.4	%	$	(11.5	)	18	%
	For 2014 and 2013, we reported a loss before income taxes with income tax expense, resulting in a negative effective tax rate for both periods. This rate was lower than the 35.0% U.S. federal statutory rate due primarily to tax on our foreign earnings that are not considered indefinitely reinvested outside the United States.
	For the period of inception through December 31, 2012, the effective tax rate was 244.4%. This rate was higher than the 35.0% U.S. federal statutory rate due primarily to the lapse of the look-through rule and the reduction in available foreign tax credits, the unfavorable impact of changes to our accrual on certain undistributed earnings of the Company’s controlled foreign subsidiaries and tax non-deductibility of certain costs incurred in connection with the 2012 Change in Control Transaction, partially offset by a favorable tax rate differential on the Company’s foreign earnings.
	For the four months ended April 30, 2012, TransUnion Intermediate Predecessor reported a loss before income taxes. The effective tax rate for this period of 18.0% was lower than the 35.0% U.S. federal statutory rate due primarily to the impact of recording tax expense on our undistributed foreign earnings, the non-deductibility of certain costs incurred in connection with the 2012 Change in Control Transaction and limitations on our foreign tax credits.
	Effective January 1, 2012, the look-through provision under subpart F of the U.S. Internal Revenue Code expired.
	Consequently, beginning in 2012, we recorded tax expense for the U.S. income tax we would incur in the absence of the look-through rule. As part of the American Taxpayer Relief Act of 2012 enacted into law on January 2, 2013, the look-through provision was retroactively reinstated to January 1, 2012, and we reversed the tax expense we recorded for subpart F in 2012 during the first quarter of 2013. The look-through rule was effective for 2013 and 2014 as well.
	As a result of the 2012 Change in Control Transaction and increased debt service requirements resulting from the additional debt incurred by TransUnion, we asserted at December 31, 2012, that all undistributed foreign earnings from certain controlled foreign corporations accumulated as of April 30, 2012, were not indefinitely reinvested outside the United States. Accordingly, in 2012 we recorded a deferred tax liability for the full estimated U.S. tax cost, net of related foreign tax credits, associated with remitting these earnings back to the United States. In 2014, we modified this assertion due to changes in the Company’s capital structure. We now assert that $118.7 million of earnings from our Canadian, South African and Netherlands subsidiaries and CIBIL are not indefinitely reinvested outside the United States.
	Components of net deferred income tax consisted of the following:
	(in millions)	December 31,				December 31,
		2014				2013
	Deferred income tax assets:
	Compensation	$	9.8			$	6.8
	Employee benefits	7.8				6.3
	Legal reserves and settlements	5.3				3.5
	Hedge investments	0.7				0.4
	Financing related costs	3.6				39.4
	Loss and credit carryforwards	110.7				72.5
	Other	8.6				8.6
	Gross deferred income tax assets	146.5				137.5
	Valuation allowance	(42.1		)		(25.9		)
	Total deferred income tax assets, net	$	104.4			$	111.6
	Deferred income tax liabilities:
	Depreciation and amortization	$	(663.3	)		$	(647.3	)
	Investments in affiliated companies	(15.0		)		(17.1		)
	Taxes on undistributed foreign earnings	(50.4		)		(57.1		)
	Other	(1.3		)		(4.9		)
	Total deferred income tax liability	(730.0		)		(726.4		)
	Net deferred income tax liability	$	(625.6	)		$	(614.8	)
	The temporary differences resulting from differing treatment of items for tax and accounting purposes results in deferred tax assets and liabilities. If deferred tax assets are not likely to be recovered in future years, a valuation allowance is recorded. During 2014, our valuation allowance increased $16.2 million primarily due to the current year foreign tax credit carryforward. As of December 31, 2014 and 2013, a valuation allowance of $42.1 million and $25.9 million, respectively, was recorded against the deferred tax assets generated by capital loss, foreign loss and foreign tax credit carryforwards. Our capital loss carryforwards will expire over the next five years, our U.S. net operating loss carryforward will expire in twenty years, and our foreign loss and foreign credit carryforwards will expire over the next ten years.
	No provision has been made for U.S. income taxes or foreign withholding taxes on $141.7 million of unremitted earnings from certain non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in operations outside the United States. It is impractical at this time to determine the tax impact if these earnings were distributed. Remitting these earnings to the United States would result in additional tax expense.
	The total amount of unrecognized tax benefits as of December 31, 2014 and 2013, was $1.9 million and $4.6 million, respectively. The amount of unrecognized tax benefits as of December 31, 2014 and 2013, which would affect the effective tax rate if recognized, was $0.3 million and $4.6 million, respectively.
The total amount of unrecognized tax benefits consisted of the following:
(in millions)	December 31,				December 31,
	2014				2013
Balance as of beginning of period	$	4.6			$	4.9
Reductions for tax positions of prior years	—				(0.1		)
Reductions relating to settlement and lapse of statute	(2.7		)		(0.2		)
Balance as of end of period	$	1.9			$	4.6
We classify interest on unrecognized tax benefits as interest expense and tax penalties as other income or expense in the consolidated statements of income. We classify any interest or penalties related to unrecognized tax benefits as other liabilities in the consolidated balance sheets. Interest expense related to taxes was insignificant for the years ended December 31, 2014 and 2013. The accrued interest payable for taxes as of December 31, 2014 and 2013, was $0.9 million and $0.7 million, respectively. There was no significant expense recognized, or significant liability recorded, for tax penalties as of December 31, 2014 or 2013.
We are regularly audited by federal, state, local and foreign taxing authorities. Given the uncertainties inherent in the audit process, it is reasonably possible that certain audits could result in a significant increase or decrease in the total amount of unrecognized tax benefits. An estimate of the range of the increase or decrease in unrecognized tax benefits due to audit results cannot be made at this time. As of December 31, 2014, tax years 2006 and forward remained open for examination in some state and foreign jurisdictions and tax years 2009 and forward remained open for the federal purposes. The Internal Revenue Service has issued its final Revenue Agent's Report to the Company for its 2009 through 2011 tax years. We have evaluated the issues raised and, where appropriate, made adjustments in 2014 where we determined that we did not have a more likely than not probability of prevailing upon appeal.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Stock-Based Compensation
	In connection with the 2012 Change in Control Transaction, the 2010 Management Equity Plan (the "2010 Plan") was cancelled and replaced with the TransUnion Holding Company, Inc. 2012 Management Equity Plan (the "2012 Plan") as approved by stockholders. Under the 2012 Plan, stock-based awards may be issued to executive officers, employees and independent directors of the Company. A total of 9.1 million shares have been authorized for grant under the 2012 Plan. As of December 31, 2014, 0.4 million shares remain available for future issuance under the 2012 plan.
	For the years ended December 31, 2014, and December 31, 2013, and from the date of inception through December 31, 2012, we recognized stock-based compensation of $10.6 million, $6.9 million, and $3.0 million, respectively, with related income tax benefits of approximately $3.8 million, $2.5 million and $1.1 million, respectively. For the four months ended April 30, 2012, TransUnion Intermediate Predecessor recognized $90.0 million stock-based compensation with related income tax benefits of approximately $32.4 million.
	In connection with the 2012 Change in Control Transaction, all outstanding awards under the 2010 Plan immediately vested and TransUnion Intermediate Predecessor recognized $88.0 million of accelerated stock-based compensation, with a related income tax benefit of approximately $31.7 million. All options outstanding were then cancelled and existing option holders received $91.2 million in cash consideration for the value of their options.
	Stock Options
	Stock-options granted under the 2012 Plan have a ten-year term. For stock options granted to employees, 40% generally vest based on the passage of time (service condition options), and 60% vest based on the passage of time and meeting certain shareholder return on investment conditions (market condition options). All stock options granted to independent directors vest based on the passage of time.
	Service condition options are valued using the Black-Scholes valuation model and vest over a five-year service period, with 20% generally vesting one year after the grant date, and 5% vesting each quarter thereafter. Compensation costs for the service condition awards are recognized on a straight-line basis over the requisite service period for the entire award. Market condition options are valued using a risk-neutral Monte Carlo valuation model, with assumptions similar to those used to value the service condition awards, and vest over a five-year service period, contingent on meeting the market conditions.
	The assumptions used to value the service condition options and the weighted-average grant date fair value for the periods presented were as follows:
		Successor											Predecessor
		Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From Date of Inception Through December 31, 2012			Four Months Ended April 30, 2012
	Service condition options:
	Dividend yield	—				—				—			—
	Expected volatility	55%-60%				60%-70%				59		%	30		%
	Risk-free interest rate	0.9%-2.3%				0.9%-1.0%				0.9		%	2.4		%
	Expected life, in years	5.9-6.4				5.9-6.1				6.2			6.5
	Weighted-average grant date fair value	$	8.16			$	5.61			$	4.97		$	15.74
	Market condition options:
	Weighted-average grant date fair value	$	7.45			$	5.19			$	4.08		$	15.15
	The dividend yield was estimated to be zero because we do not expect to pay dividends in the future. The expected volatility was estimated based on comparable company volatility. The risk-free interest rate was derived from the constant maturity treasury curve for terms matching the expected life of the award. The expected life was calculated using the simplified method described in SAB No. 110 because we do not have sufficient historical data related to exercise behavior.
	In connection with a special dividend of $3.41 per common share paid on November 1, 2012, the Compensation Committee of the Board of Directors approved an equitable adjustment to reduce the exercise price of options outstanding at November 9, 2012, from $10.07 to $6.65 per share. Since the Company’s options do not contain mandatory anti-dilution provisions, the adjustment was treated as a modification of the options’ terms and conditions, resulting in $2.8 million of additional compensation expense that is being recognized over the remaining requisite service period as of the modification date.
	Stock option activity as of and for the years ended December 31, 2014 and December 31, 2013, consisted of the following:
	(in millions, except share and per share information)	Shares			Weighted				Weighted		Aggregate
					Average				Average		Intrinsic
					Exercise				Remaining		Value
					Price				Contractual		(in millions)
									Term
									(in years)
	Outstanding at December 31, 2013	7,106,389			$	7.46			8.8		$	28.2
	Granted	1,461,865			$	14.76
	Exercised	(164,484	)		$	6.65
	Forfeited	(717,973	)		$	8.64
	Expired	(1,350	)		$	6.65
	Outstanding at December 31, 2014	7,684,447			$	8.83			8.2		$	65.8
	Fully vested and expected to vest at December 31, 2014	7,022,716			$	8.83			8.2		$	60.2
	Exercisable at December 31, 2014	995,418			$	7.17			7.9		$	10.2
	As of December 31, 2014, stock-based compensation expense remaining to be recognized in future years related to options, excluding an estimate for forfeitures, was $11.3 million for service condition options and $15.5 million for market condition options, with weighted-average recognition periods of 3.5 years and 2.7 years, respectively. During 2014, cash received from the exercise of stock options was $1.1 million with a tax benefit realized from these exercises of approximately $0.1 million.
	The intrinsic value of options exercised and the fair value of options vested for the periods presented are as follows:
			Successor											Predecessor
	(in millions)		Year Ended December 31, 2014				Year Ended December 31, 2013				From Date of Inception Through December 31, 2012			Four Months Ended April 30, 2012
	Intrinsic value of options exercised		$	1.1			$	0.5			$	—		$	—
	Total fair value of options vested		$	3			$	3.7			$	—		$	18.2
	For the four months ended April 30, 2012, the total fair value of options vested includes the fair value of options that vested in connection with the 2012 Change in Control Transaction.
	Stock appreciation rights
	During the years ended December 31, 2014, and December 31, 2013, and from the date of inception through December 31, 2012, the Company granted 0.1 million, 0.1 million and 0.9 million stock appreciation rights (“SARs”), respectively, with weighted-average exercise prices of $14.58, $9.52 and $6.65, respectively. The SARs have a ten-year term, with 40% vesting over a five-year service period and 60% vesting over a five-year service period contingent on meeting certain market conditions. The SARs provide for cash settlement and are being accounted for as liability awards, with expense recognized based on the award's fair value and the percentage of requisite service rendered at the end of each reporting period.
	In connection with a special dividend of $3.41 per common share paid on November 1, 2012, the Compensation Committee of the Board of Directors approved an equitable adjustment to reduce the exercise price of the SARs outstanding at November 9, 2012, from $10.07 to $6.65 per share.
	As of December 31, 2014, 0.1 million SARs had vested, 0.2 million SARs had been forfeited, and 0.1 million SARs had been exercised. During 2014, $0.1 million of share-based liabilities were paid for SARs that were exercised during the year. Stock-based compensation expense remaining to be recognized in future years related to SARs was $3.9 million based on the fair value of the awards at December 31, 2014.
	Restricted stock
	During 2012, the Company granted 25,082 shares of restricted stock that cliff vest after three years under the 2012 Management Equity Plan. During 2014 and 2013, there we no new grants or forfeitures and none of the restricted stock vested. The weighted average grant date fair value was $6.65. As of December 31, 2014, stock-based compensation expense remaining to be recognized in future years related to restricted stock was $0.1 million with a weighted-average recognition period of one year.
	In connection with a special dividend of $3.41 per common share paid on November 1, 2012, the grant date fair value of restricted stock issued was reset from $10.07 to $6.65 per share.

Fair_Value

Fair Value	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value	Fair Value
	The following table summarizes financial instruments measured at fair value, on a recurring basis, as of December 31, 2014:
	(in millions)	Total			Level 1		Level 2			Level 3
	Assets
	Trading securities	$	10.9		$	6.6	$	4.3		$	—
	Available for sale securities	3			—		3			—
	Total	$	13.9		$	6.6	$	7.3		$	—
	Liabilities
	Contingent obligation	$	(5.0	)	$	—	$	—		$	(5.0	)
	Interest rate swaps	(2.0		)	—		(2.0		)	—
	Total	$	(7.0	)	$	—	$	(2.0	)	$	(5.0	)
	Level 1 instruments consist of exchange-traded mutual funds. Exchange-traded mutual funds are trading securities valued at their current market prices. These securities relate to a nonqualified deferred compensation plan held in trust for the benefit of plan participants.
	Level 2 instruments consist of pooled separate accounts, foreign exchange-traded corporate bonds and interest rate swaps. Pooled separate accounts are designated as trading securities valued at net asset values. These securities relate to the nonqualified deferred compensation plan held in trust for the benefit of plan participants. Foreign exchange-traded corporate bonds are available-for-sale securities valued at their current quoted prices. These securities mature between 2027 and 2033. Interest rate swaps fair values are determined using standard valuation models with market-based observable inputs including forward and spot exchange rates and interest rate curves. See Note 12, “Debt” for additional information regarding interest rate swaps.
	Unrealized gains and losses on trading securities are included in net income, while unrealized gains and losses on available for sale securities are included in other comprehensive income. There were no significant realized or unrealized gains or losses on our securities for any of the periods presented.
	Level 3 instruments consist of contingent obligations related to recent acquisitions with maximum payouts totaling $19.5 million. These obligations are contingent upon meeting certain performance requirements in 2015 and 2016. The fair values of these obligations were determined based on an income approach, using our current expectations of the future earnings of the acquired entities. We assess the fair value of these obligations each reporting period with any changes reflected as gains or losses in selling, general and administrative expenses in the consolidated statements of income. During 2014, we recorded an expense of $1.5 million as a result of changes to the fair value of these obligations.

Operating_Segments

Operating Segments	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Operating Segments	Operating Segments
	Operating segments are businesses for which separate financial information is available and evaluated regularly by the chief operating decision-maker in deciding how to allocate resources. This segment financial information is reported on the basis that is used for the internal evaluation of operating performance. The accounting policies of the segments are the same as described in Note 1, “Significant Accounting and Reporting Policies.”
	We evaluate the performance of segments based on revenue and operating income. Intersegment sales and transfers have been eliminated and were not material.
	The following is a more detailed description of the three operating segments and the Corporate unit, which provides support services to each operating segment:
	U.S. Information Services
	U.S. Information Services (“USIS”) provides consumer reports, risk scores, analytical services and decisioning capabilities to businesses. These businesses use our services to acquire new customers, assess consumer ability to pay for services, identify cross-selling opportunities, measure and manage debt portfolio risk, collect debt, verify consumer identities and investigate potential fraud. These core capabilities and delivery platforms in our USIS segment allow us to serve a broad set of customers and business issues. We offer our services to customers in the financial services, insurance, healthcare and other industries.
	International
	The International segment provides services similar to our USIS segment to businesses in select regions outside the U.S. Depending on the maturity of the credit economy in each country; services may include credit reports, analytics and decisioning services and other value-added risk management services. In addition, we have insurance, business and automotive databases in select geographies. These services are offered to customers in a number of industries including financial services, insurance, automotive, collections and communications, and are delivered through both direct and indirect channels. The International segment also provides consumer services similar to those offered by our Consumer Interactive segment that help consumers proactively manage their personal finances.
	Consumer Interactive
	Consumer Interactive offers solutions that help consumers manage their personal finances and take precautions against identity theft. Services in this segment include credit reports and scores, credit monitoring, fraud protection and resolution and financial management. Our products are provided through user friendly online and mobile interfaces and supported by educational content and customer support. Our Consumer Interactive segment serves over 35 million consumers through both direct and indirect channels.
	Corporate
	Corporate provides shared services for the Company and conducts enterprise functions. Certain costs incurred in Corporate that are not directly attributable to one or more of the operating segments remain in Corporate. These costs are typically for enterprise-level functions and are primarily administrative in nature.
	Selected financial information consisted of the following:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception through December 31, 2012				Four Months
														Ended April 30, 2012
	Revenue
	U.S. Information Services	$	818.6			$	740.6			$	487.4			$	238.1
	International	255.5				238.9				157.8				76.6
	Consumer Interactive	230.6				203.7				121.8				58.3
	Total	$	1,304.70			$	1,183.20			$	767			$	373
	Operating income (loss)
	U.S. Information Services	$	112.8			$	154.7			$	121.9			$	33.2
	International	22.2				19.5				19.1				5.3
	Consumer Interactive	85.5				65.6				48.7				13
	Corporate	(92.1		)		(70.6		)		(48.5		)		(51.7		)
	Total	$	128.4			$	169.2			$	141.2			$	(0.2	)
	Reconciliation of operating income (loss) to income (loss) from operations before income tax:
	Operating income from segments	$	128.4			$	169.2			$	141.2			$	(0.2	)
	Non-operating income and expense	(130.2		)		(195.1		)		(138.5		)		(63.7		)
	Income (loss) from operations before income tax	$	(1.8	)		$	(25.9	)		$	2.7			$	(63.9	)
	Earnings from equity method investments, included in non-operating income and expense was as follows:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception through December 31, 2012				Four Months
														Ended April 30, 2012
	U.S. Information Services	$	1.2			$	1.4			$	0.9			$	0.5
	International	11.3				12.3				7.1				3.6
	Total	$	12.5			$	13.7			$	8			$	4.1
	Total assets, by segment, consisted of the following:
	(in millions)	December 31,					December 31,
		2014					2013
	U.S. Information Services	$	2,932.80				$	2,894.70
	International	1,268.10					1,166.80
	Consumer Interactive	268.8					268.3
	Corporate	196.1					162.5
	Total	$	4,665.80				$	4,492.30
	Cash paid for capital expenditures, by segment, was as follows:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception through December 31, 2012				Four Months Ended April 30, 2012
	U.S. Information Services	$	99.6			$	46.9			$	30.8			$	14.3
	International	30.1				17.1				8.6				2.4
	Consumer Interactive	5.3				3.9				2.8				1.3
	Corporate	20.2				13.8				6.6				2.4
	Total	$	155.2			$	81.7			$	48.8			$	20.4
	Depreciation and amortization expense by segment was as follows:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception Through December 31, 2012				Four Months
														Ended April 30, 2012
	U.S. Information Services	$	174.3			$	129.3			$	78.9			$	22.3
	International	51				39.9				25.8				3.7
	Consumer Interactive	10.3				8.9				5.2				1.3
	Corporate	5.6				8.7				5.1				1.9
	Total	$	241.2			$	186.8			$	115			$	29.2
	Percentage of revenue based on the country where it was earned, was as follows:
	Successor										Predecessor
(in millions)	Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013			From the Date of Inception Through December 31, 2012				Four Months
											Ended April 30, 2012
United States	80	%		80	%		79	%			79	%
South Africa	6	%		6	%		7	%			8	%
Canada	5	%		5	%		5	%			6	%
Other	9	%		9	%		9	%			7	%
Percentage of long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset, was as follows:
	Percent of Long-Lived
	Assets
Country	2014			2013			2012
United States	82	%		85	%		81	%
South Africa	3	%		3	%		5	%
Canada	3	%		3	%		4	%
Other	12	%		9	%		10	%

Commitments

Commitments	12 Months Ended
	Dec. 31, 2014
Commitments [Abstract]
Commitments	Commitments
	Future minimum payments for noncancelable operating leases, purchase obligations and other liabilities of the Company in effect as of December 31, 2014, are payable as follows:
	(in millions)	Operating		Purchase		Total
		Leases		Obligations
	2015	$	12.8	$	182	$	194.8
	2016	9.9		31.9		41.8
	2017	7		11.1		18.1
	2018	5.4		6.7		12.1
	2019	5		1.1		6.1
	Thereafter	11.8		2.5		14.3
	Totals	$	51.9	$	235.3	$	287.2
	Purchase obligations include $106.5 million of trade accounts payable that were included in our balance sheet as of December 31, 2014. Purchase obligations include commitments for outsourcing services, royalties, data licenses, maintenance and other operating expenses. Rental expense related to operating leases was $13.4 million, $11.0 million, and $7.4 million for the years ended December 31, 2014, and December 31, 2013, and from date of inception through December 31, 2012, respectively. Rental expense related to operating leases was $3.7 million of TransUnion Intermediate Predecessor for the four months ended April 30, 2012.
	Licensing agreements
	We have agreements with Fair Isaac Corporation to license credit-scoring algorithms and the right to sell credit scores derived from those algorithms. Payment obligations under these agreements vary due to factors such as the volume of credit scores we sell, what type of credit scores we sell, and how our customers use the credit scores. There are no minimum payments required under these licensing agreements. However, we do have a significant level of sales volume related to these credit scores.

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies
	Litigation
	In the ordinary course of business, we are routinely named as defendants in, or parties to, various legal actions and proceedings relating to our current or past business operations. These actions generally assert claims for violations of federal or state credit reporting, consumer protection or privacy laws, or common law claims related to privacy, libel, slander or the unfair treatment of consumers, and may include claims for substantial or indeterminate compensatory or punitive damages, or injunctive relief, and may seek business practice changes. In the ordinary course of business, we also are subject to governmental and regulatory examinations, information-gathering requests, investigations and proceedings (both formal and informal), certain of which may result in adverse judgments, settlements, fines, penalties, injunctions or other relief. In connection with formal and informal inquiries by these regulators, we routinely receive requests, subpoenas and orders seeking documents, testimony and other information in connection with various aspects of our activities. We regularly review all litigation and regulatory matters to determine whether a loss is probable and, if probable, whether the loss can be reasonably estimated. If a loss is probable and can be reasonably estimated, an appropriate reserve is accrued, taking into consideration legal positions, contractual obligations and applicable insurance coverages, and included in other current liabilities. We believe that the reserves established for pending or threatened legal and regulatory matters are appropriate based on the facts currently known. Due to the uncertainties inherent in the investigation and resolution of legal and regulatory matters, however, the actual costs of resolving litigation and regulatory matters may be substantially higher than the amounts reserved for those matters, and an adverse outcome in certain of these matters could have a material adverse effect on our financial results. Legal fees incurred in connection with ongoing litigation are considered a period cost and are expensed as incurred.
	As of December 31, 2014 and 2013, we accrued $17.8 million and $13.8 million, respectively, for anticipated claims. These amounts were recorded in other accrued liabilities in the consolidated balance sheets and the associated expenses were recorded in selling, general and administrative expenses in the consolidated statements of income.

RelatedParty_Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions
	Stockholder Agreement
	In connection with the 2012 Change in Control Transaction, TransUnion, GS and Advent entered into the Major Stockholders’ Agreement. Under the terms of the agreement, GS and Advent have the right to appoint all members of TransUnion’s board of directors.
	Consulting Agreement
	In connection with the 2012 Change in Control Transaction, TransUnion, GS and Advent entered into a consulting agreement. Under the terms of the agreement, GS and Advent are to receive an advisory fee of $0.3 million each, increasing 5% annually, in exchange for services provided, including (i) general executive and management services; (ii) identification, support, negotiation and analysis of acquisitions and dispositions; (iii) support, negotiation and analysis of financing alternatives, including in connection with acquisitions, capital expenditures and refinancing of existing debt; (iv) finance functions, including assistance in the preparation of financial projections and monitoring of compliance with financing agreements; (v) human resources functions, including searching and recruiting of executives; and (vi) other services as mutually agreed upon. For the years ended December 31, 2014 and December 31, 2013, and from the date of inception through December 31, 2012, we incurred fees from Advent totaling $0.3 million, $0.3 million, and $0.1 million, respectively. For the years ended December 31, 2014 and December 31, 2013, and from the date of inception through December 31, 2012, we incurred fees from GS totaling $0.3 million, $0.3 million, and $0.1 million, respectively.
	In connection with his resignation as President and Chief Executive Officer of the Company, TransUnion and Siddharth N. (Bobby) Mehta, a director of the Company, entered into a consulting agreement, dated December 6, 2012, pursuant to which Mr. Mehta provides advice and consultation to assist Mr. Peck in the transition of duties as Chief Executive Officer and to Mr. Peck and the Board of Directors with respect to the Company's strategic operating plan and strategic opportunities or transactions considered by the Company from time to time. Pursuant to the terms of the agreement, Mr. Mehta receives a consulting services fee of $0.2 million on or before January 10 of each year during the term of the agreement. Either party may terminate the agreement by providing notice of non-renewal at least sixty (60) days prior to the end of the then-current term.
	Other Fees
	In connection with the 2012 Change in Control Transaction and the issuance of the 8.125% notes, in 2012, we paid acquisition-related and underwriting fees of $11.9 million and $0.2 million to affiliates of GS and Advent, respectively, and TransUnion Intermediate Predecessor paid $1.4 million of acquisition-related fees to affiliates of GS.
	Legal Services
	TransUnion paid $0.5 million from the date of inception through December 31, 2012, and TransUnion Intermediate Predecessor paid $0.1 million for the four months ended April 30, 2012, to the law firm of Neal, Gerber & Eisenberg LLP for legal services. Marshall E. Eisenberg, a partner in the law firm, is a co-trustee of certain Pritzker family U.S.-based trusts that beneficially owned in excess of 5% of the Company’s common stock prior to the 2012 Change in Control Transaction.
	TransUnion paid $0.4 million from the date of inception through December 31, 2012, and TransUnion Intermediate Predecessor paid $3.5 million for the four months ended April 30, 2012, to the law firm of Latham and Watkins LLP. Michael A. Pucker, a partner in the law firm, is an immediate family member of a co-trustee of certain Pritzker family U.S.-based trusts that beneficially owned in excess of 5% of the Company’s common stock prior to the 2012 Change in Control Transaction.
	Payables
	Other liabilities at December 31, 2014 and 2013, included $3.2 million, owed to certain Pritzker family business interests related to tax indemnification payments arising in connection with the 2010 change in control transaction. This amount is subject to future adjustments based on a final determination of tax expense.
	Issuances of Common Stock
	During 2014, the Company sold an aggregate of 257,576 shares of common stock at a purchase price of $17.40 per share to Executive Officers of the Company.
	During 2013, the Company sold an aggregate of 87,566 and 26,326 shares of common stock at a purchase price of $11.42 and $6.65 per share, respectively, to Executive Officers of the Company. During 2012, the Company sold an aggregate of 424,800 shares of common stock at a price of $6.65 per share to Executive Officers of the Company.
	Investment Purchase
	During 2014, the Company had no purchases of common stock from current or former Executive Officers of the Company. During 2013, the Company purchased an aggregate of 109,623 and 297,955 shares of common stock at a price of $11.42 and $6.65 per share, respectively, from former Executive Officers of the Company. During 2012, the Company purchased an aggregate of 69,625 shares of common stock at a price of $10.07 from a former Executive Officer of the Company.

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited)
	The quarterly financial data for 2014 and 2013 consisted of the following:
		Three Months Ended
	(in millions)	December 31,			September 30,			June 30,			March  31,
		2014			2014			2014			2014
	Revenue	$	335.6		$	338.2		$	327.5		$	303.4
	Operating income	20.4			40.8			32.4			34.8
	Net income (loss)	(10.7		)	(0.1		)	19.9			(13.5		)
	Net income (loss) attributable to TransUnion	(13.1		)	(2.6		)	17.9			(14.7		)
	Earnings per share:
	Basic	$	(0.12	)	$	(0.02	)	$	0.16		$	(0.13	)
	Diluted	$	(0.12	)	$	(0.02	)	$	0.16		$	(0.13	)
		Three Months Ended
	(in millions)	December 31,			September 30,			June 30,			March  31,
		2013			2013			2013			2013
	Revenue	$	292.4		$	299.5		$	300.8		$	290.5
	Operating income	36.2			49.3			39.5			44.2
	Net income (loss)	(15.7		)	(1.4		)	(6.1		)	(5.0		)
	Net income (loss) attributable to TransUnion	(17.6		)	(3.4		)	(7.8		)	(6.3		)
	Earnings per share:
	Basic	$	(0.16	)	$	(0.03	)	$	(0.07	)	$	(0.06	)
	Diluted	$	(0.16	)	$	(0.03	)	$	(0.07	)	$	(0.06	)

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	The following table sets forth the changes in each component of accumulated other comprehensive income (loss), net of tax:
	(in millions)	Foreign			Net			Net		Accumulated
		Currency			Unrealized			Unrealized		Other
		Translation			Gain/(Loss)			Gain/(Loss)		Comprehensive
		Adjustment			On Hedges			On Available-for-sale Securities		Income /
										(Loss)
	Predecessor balance, December 31, 2011	$	(3.6	)	$	—		$	—	$	(3.6	)
	Change	2.2			—			—		2.2
	Predecessor balance, April 30, 2012	$	(1.4	)	$	—		$	—	$	(1.4	)
	Purchase accounting adjustments	1.4			—			—		1.4
	Change	(20.7		)	(3.7		)	—		(24.4		)
	Successor balance, December 31, 2012	$	(20.7	)	$	(3.7	)	$	—	$	(24.4	)
	Change	(51.9		)	3.1			—		(48.8		)
	Successor balance, December 31, 2013	$	(72.6	)	$	(0.6	)	$	—	$	(73.2	)
	Change	(44.2		)	(0.2		)	0.1		(44.3		)
	Successor balance, December 31, 2014	$	(116.8	)	$	(0.8	)	$	0.1	$	(117.5	)

Condensed_Financial_Informatio

Condensed Financial Information of TransUnion Holding Company, Inc.	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of TransUnion Holding Company, Inc.	Schedule I—Condensed Financial Information of TransUnion
	TRANSUNION
	Parent Company Only
	Balance Sheet
	(in millions, except per share data)
		December 31,			December 31,
		2014			2013
	Assets
	Current assets:
	Due from TransUnion Intermediate	$	86.2		$	52.7
	Other current assets	22.7			7.5
	Total current assets	108.9			60.2
	Investment in TransUnion Intermediate	1,505.60			1,584.60
	Other assets	20.9			28.1
	Total assets	$	1,635.40		$	1,672.90
	Liabilities and stockholders’ equity
	Current liabilities:
	Trade accounts payable	$	0.1		$	0.2
	Other current liabilities	18.3			33.4
	Total current liabilities	18.4			33.6
	Long-term debt	998.7			998.3
	Other liabilities	31.2			13.1
	Total liabilities	1,048.30			1,045.00
	Stockholders’ equity:
	Common stock, $0.01 par value; 200.0 million shares authorized at December 31, 2014 and December 31, 2013, 111.4 million and 110.7 million shares issued as of December 31, 2014 and December 31, 2013, respectively; and 110.9 million and 110.2 million shares outstanding as of December 31, 2014 and December 31, 2013, respectively	1.1			1.1
	Additional paid-in capital	1,138.00			1,121.80
	Treasury stock at cost; 0.5 million shares at December 31, 2014 and December 31, 2013	(4.3		)	(4.1		)
	Accumulated deficit	(430.2		)	(417.7		)
	Accumulated other comprehensive income (loss)	(117.5		)	(73.2		)
	Total stockholders’ equity	587.1			627.9
	Total liabilities and stockholders’ equity	$	1,635.40		$	1,672.90
	See accompanying notes to condensed financial statements.
	Schedule I —Condensed Financial Information of TransUnion
	TRANSUNION
	Parent Company Only
	Statement of Income
	(in millions)
		Twelve Months Ended December 31, 2014			Twelve Months Ended			From the Date
					December 31, 2013			of Inception
								Through
								December 31, 2012
	Revenue	$	—		$	—		$	—
	Operating expenses
	Selling, general and administrative	1.4			1.3			0.9
	Total operating expenses	1.4			1.3			0.9
	Operating loss	(1.4		)	(1.3		)	(0.9		)
	Non-operating income and expense
	Interest expense	(97.0		)	(96.3		)	(52.2		)
	Equity Income from TransUnion Intermediate	49.1			43.2			43
	Other income and (expense), net	(0.2		)	(0.2		)	(16.5		)
	Total non-operating income and expense	(48.1		)	(53.3		)	(25.7		)
	Loss from operations before income taxes	(49.5		)	(54.6		)	(26.6		)
	Benefit for income taxes	37			37.3			—
	Net loss	$	(12.5	)	$	(17.3	)	$	(26.6	)
	See accompanying notes to condensed financial statements.
	Schedule I —Condensed Financial Information of TransUnion
	TRANSUNION
	Parent Company Only
	Statements of Comprehensive Income
	(in millions)
		Twelve Months Ended December 31, 2014			Twelve Months Ended			From the Date
					31-Dec-13			of Inception
								Through December 31, 2012
	Net loss	$	(12.5	)	$	(17.3	)	$	(26.6	)
Other comprehensive loss:
Foreign currency translation:
Foreign currency translation adjustment	(47.9		)	(54.8		)	(22.1		)
Benefit for income taxes	3.8			3			1.4
Foreign currency translation, net	(44.1		)	(51.8		)	(20.7		)
Interest rate swaps:
Net unrealized gain (loss)	(0.6		)	4.8			(5.9		)
Amortization of accumulated loss	0.3			—			—
Benefit (provision) for income taxes	0.1			(1.8		)	2.2
Interest rate swaps, net	(0.2		)	3			(3.7		)
Available-for-sale securities:
Net unrealized gain	0.2			—			—
Provision for income taxes	(0.1		)	—			—
Available-for-sale securities, net	0.1			—			—
Total other comprehensive loss, net of tax	(44.2		)	(48.8		)	(24.4		)
Comprehensive loss attributable to TransUnion	$	(56.7	)	$	(66.1	)	$	(51.0	)
See accompanying notes to condensed financial statements.
Schedule I —Condensed Financial Information of TransUnion
TRANSUNION
Parent Company Only
Statement of Cash Flows
(in millions)
	Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013			From the Date of
							Inception  Through December 31, 2012
Cash used in operating activities	$	(9.4	)	$	(1.5	)	$	(16.4	)
Cash flows from investing activities:
Acquisition of TransUnion Intermediate Holdings, Inc.	—			—			(1,582.3		)
Capital investment in TransUnion Intermediate Holdings, Inc.	—			—			(80.8		)
Cash used in investing activities	—			—			(1,663.1		)
Cash flows from financing activities:
Proceeds from 9.625% notes	—			—			600
Proceeds from 8.125% notes	—			—			398
Debt financing fees	—			(0.9		)	(41.3		)
Proceeds from issuance of common stock and exercise of stock options	9.6			5.8			1,097.30
Treasury stock purchases	(0.2		)	(3.4		)	(0.7		)
Dividends	—			—			(373.8		)
Cash provided by financing activities	9.4			1.5			1,679.50
Net change in cash and cash equivalents	—			—			—
Cash and cash equivalents, beginning of period	—			—			—
Cash and cash equivalents, end of period	$	—		$	—		$	—
See accompanying notes to condensed financial statements.
Schedule I —Condensed Financial Information of TransUnion
TRANSUNION
Parent Company Only
Notes To Financial Statements
Note 1. Basis of Presentation
In the TransUnion (formerly known as TransUnion Holding Company, Inc.) parent company only financial statements, the Company’s investment in subsidiaries is stated at cost plus equity in the undistributed earnings of subsidiaries since the date of acquisition. The Company’s share of net income of its subsidiaries is included in consolidated income using the equity method. The parent company only financial information should be read in conjunction with TransUnion's consolidated financial statements.
Note 2. Income tax
TransUnion entered into an intercompany tax allocation agreement with TransUnion Intermediate Holdings, Inc. in 2013, effective for all taxable periods from May 1, 2012, forward, in which they are members of the same consolidated federal or state tax groups. The agreement allocates the consolidated tax liability from those filings among the various members of the group. We recorded the cumulative effect of the intercompany tax allocation agreement to TransUnion's balance sheet and statement of income during 2013.
Note 3. Dividends from subsidiaries
Cash dividends paid to TransUnion from its consolidated subsidiaries were $90.3 million, $94.2 million and $27.9 million for the years ended December 31, 2014 and 2013, and from inception through December 31, 2012, respectively.

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	Schedule II—Valuation and Qualifying Accounts
	TRANSUNION
	(in millions)	Balance at		Charged to			Charged to		Deductions(1)			Balance at
		Beginning of year		Costs and			Other					End of
				Expenses			Accounts					Year
	Allowance for doubtful accounts:
	Year ended December 31,
	2014	$	0.7	$	3.2		$	—	$	(1.5	)	$	2.4
	2013	$	1.7	$	0.8		$	—	$	(1.8	)	$	0.7
	2012	$	—	$	(1.9	)	$	3.7	$	(0.1	)	$	1.7
	Allowance for deferred tax assets:
	Year ended December 31,
	2014	$	25.9	$	19.5		$	—	$	(3.3	)	$	42.1
	2013	$	27.2	$	4.8		$	—	$	(6.1	)	$	25.9
	2012	$	—	$	5		$	24.8	$	(2.6	)	$	27.2
	____________________
	(1)	For the allowance for doubtful accounts, includes write-offs of uncollectable accounts.

Significant_Accounting_and_Rep1

Significant Accounting and Reporting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Description of Business	Description of Business
Basis of Presentation	Basis of Presentation
	The accompanying consolidated financial statements of TransUnion (formerly known as TransUnion Holding Company, Inc.) and subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). Our consolidated financial statements reflect all adjustments which, in the opinion of management, are necessary for a fair presentation of the periods presented. All significant intercompany transactions and balances have been eliminated.
	TransUnion Holding Company, Inc. was formed on February 15, 2012, as a vehicle to acquire TransUnion Corp. on April 30, 2012. On March 26, 2015, TransUnion Holding Company, Inc. was renamed TransUnion and TransUnion Corp. was renamed TransUnion Intermediate Holdings, Inc. ("TransUnion Intermediate"). The historical financial statements and information are presented on a Successor and Predecessor basis. The historical financial information for TransUnion Intermediate reflects the consolidated results of TransUnion Intermediate and its subsidiaries prior to the 2012 Change in Control Transaction (the “Predecessor”). The historical financial information for TransUnion reflects the stand-alone results of its operations from its date of inception and the consolidated results of TransUnion Intermediate and its subsidiaries after April 30, 2012 (the “Successor”).
	Unless the context indicates otherwise, any reference in this report to the “Company,” “we,” “us,” and “our” refers to TransUnion with its direct and indirect subsidiaries, including TransUnion Intermediate, or to TransUnion Intermediate and its subsidiaries for periods prior to the forming of TransUnion.
2012 Change in Control Transaction	2012 Change in Control Transaction
	TransUnion was formed by affiliates of Advent International Corporation (“Advent”) and Goldman Sachs & Co. (“GS”) on February 15, 2012, as a vehicle to acquire 100% of the outstanding common stock of TransUnion Intermediate. On April 30, 2012, pursuant to an Agreement and Plan of Merger, TransUnion acquired TransUnion Intermediate. To partially fund the acquisition, TransUnion issued $600.0 million aggregate principal amount of 9.625%/10.375% senior PIK toggle notes due 2018 (9.625% notes). We refer to these transactions collectively as the “2012 Change in Control Transaction.”
	The 2012 Change in Control Transaction was accounted for using the acquisition method of accounting in accordance with Accounting Standards Codification (“ASC”) 805, Business Combinations, with the basis of the assets acquired and liabilities assumed recorded at fair value to reflect the purchase price.
Subsequent events	Subsequent Events
	Events and transactions occurring through the date of issuance of the financial statements have been evaluated by management, and when appropriate, recognized or disclosed in the consolidated financial statements.
Principles of consolidation	Principles of Consolidation
	The consolidated financial statements of TransUnion include the accounts of TransUnion and all of its majority-owned or controlled subsidiaries. Investments in unconsolidated entities in which the Company has at least a 20% ownership interest, or where it is able to exercise significant influence, are accounted for using the equity method. Nonmarketable investments in unconsolidated entities in which the Company has less than a 20% ownership interest, or where it is not able to exercise significant influence, are accounted for using the cost method and periodically reviewed for impairment.
Use of Estimates	Use of Estimates
	The preparation of consolidated financial statements and related disclosures in accordance with GAAP requires management to make estimates and judgments that affect the amounts reported. We believe that the estimates used in preparation of the accompanying consolidated financial statements are reasonable, based upon information available to management at this time. These estimates and judgments affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the balance sheet date, as well as the amounts of revenue and expense during the reporting period. Estimates are inherently uncertain and actual results could differ materially from the estimated amounts.
Accounting Changes [Text Block]	Change in Accounting Estimate
	Effective July 1, 2014, we revised the remaining useful lives of certain internal use software, equipment, leasehold improvement and corporate headquarters facility assets to align with the expected completion dates of our strategic initiatives to transform our technology infrastructure and corporate headquarters facility. As a result, depreciation and amortization expense increased by $17.5 million. The net of tax impact of this change decreased net income attributable to TransUnion by $11.2 million,or $0.10 p
Reclassification, Policy [Policy Text Block]	Reclassifications
	We have reclassified certain items, which are not material, that are presented in our prior period consolidated financial statements to conform to the current year’s presentation.
Segments	Segments
	We manage our business and report our financial results in three operating segments: U.S. Information Services (“USIS”); International; and Consumer Interactive (formerly "Interactive"). We also report expenses for Corporate, which provides support services to each operating segment. Details of our segment results are discussed in Note 17, “Operating Segments.”
Revenue Recognition and Deferred Revenue	Revenue Recognition and Deferred Revenue
	Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the pricing is fixed or determinable and the collectability is reasonably assured. For multiple element arrangements, we separate deliverables into units of accounting and recognize revenue for each unit of accounting based on evidence of each unit’s relative selling price to the total arrangement consideration, assuming all other revenue recognition criteria have been met.
	A significant portion of our revenue is derived from providing information services to our customers. This revenue is recognized when services are provided, assuming all criteria for revenue recognition are met. A smaller portion of our revenue relates to subscription-based contracts where a customer pays a predetermined fee for a predetermined, or unlimited, number of transactions or services during the subscription period. Revenue related to subscription-based contracts having a preset number of transactions is recognized as the services are provided, using an effective transaction rate as the actual transactions are completed. Any remaining revenue related to unfulfilled units is not recognized until the end of the related contract’s subscription period. Revenue related to subscription-based contracts having an unlimited volume is recognized straight-line over the contract term.
	Deferred revenue generally consists of amounts billed in excess of revenue recognized for the sale of data services, subscriptions and set up fees. Deferred revenue is included in other current liabilities.
Costs of Services	Costs of Services
	Costs of services include data acquisition and royalty fees, personnel costs related to our databases and software applications, consumer and call center support costs, hardware and software maintenance costs, telecommunication expenses, research and development costs and occupancy costs associated with the facilities where these functions are performed.
Selling, General and Administrative Expenses	Selling, General and Administrative Expenses
	Selling, general and administrative expenses include personnel-related costs for sales, administrative and management employees, costs for professional and consulting services, advertising and occupancy and facilities expense of these functions. Advertising costs are expensed as incurred. Advertising costs for the years ended December 31, 2014 and 2013, and from the date of inception through December 31, 2012 were $31.3 million, $32.3 million and $19.2 million, respectively. Advertising costs of TransUnion Intermediate Predecessor for the four months ended April 30, 2012 were $15.5 million.
Stock-Based Compensation	Stock-Based Compensation
	Compensation expense for all stock-based compensation awards is determined using the grant date fair value and includes an estimate for expected forfeitures. Expense is recognized on a straight-line basis over the requisite service period of the award, which is generally equal to the vesting period. The details of our stock-based compensation program are discussed in Note 15, “Stock-Based Compensation.”
Income Taxes	Income Taxes
	Deferred income tax assets and liabilities are determined based on the estimated future tax effects of temporary differences between the financial statement and tax basis of assets and liabilities, as measured by current enacted tax rates. The effect of a tax rate change on deferred tax assets and liabilities is recognized in operations in the period that includes the enactment date of the change. We periodically assess the recoverability of our deferred tax assets, and a valuation allowance is recorded against deferred tax assets if it is more likely than not that some portion of the deferred tax assets will not be realized. See Note 14, “Income Taxes,” for additional information.
Foreign Currency Translation	Foreign Currency Translation
	The functional currency for each of our foreign subsidiaries is generally that subsidiary’s local currency. We translate the assets and liabilities of foreign subsidiaries at the year-end exchange rate, and translate revenues and expenses at the monthly average rates during the year. We record the resulting translation adjustment as a component of other comprehensive income in stockholders’ equity.
	Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are included in the results of operations as incurred. The exchange rate loss for the years ended December 31, 2014 and December 31, 2013, was $1.1 million and $0.8 million, respectively. The exchange rate gain from the date of inception through December 31, 2012 was less than $0.1 million. The exchange rate gain of TransUnion Intermediate Predecessor for the four months ended April 30, 2012 was $0.2 million.
Cash and Cash Equivalents	Cash and Cash Equivalents
	We consider investments in highly liquid debt instruments with original maturities of three months or less to be cash equivalents.
Trade Accounts Receivable	Trade Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts is based on our historical write-off experience, analysis of the aging of outstanding receivables, customer payment patterns and the establishment of specific reserves for customers in adverse financial condition or for existing contractual disputes. Adjustments to the allowance are recorded as a bad debt expense in selling, general and administrative expenses. Trade receivables are written off against the allowance when they are determined to be no longer collectible. We reassess the adequacy of the allowance for doubtful accounts each reporting period.
Long-Lived Assets	Long-Lived Assets
	Property, Plant, Equipment and Intangibles
	Property, plant and equipment was adjusted to fair value on the date of the 2012 Change in Control Transaction. All subsequent purchases of property, plant and equipment have been recorded at cost. Property, plant and equipment is depreciated primarily using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements are generally depreciated over twenty years. Computer equipment and purchased software are depreciated over three to seven years. Leasehold improvements are depreciated over the shorter of the estimated useful life of the asset or the lease term. Other assets are depreciated over five to seven years. Intangibles, other than indefinite-lived intangibles, are amortized using the straight-line method over their economic life, generally three to forty years. Assets to be disposed of are separately presented in the consolidated balance sheet and reported at the lower of the carrying amount or fair value, less costs to sell, and are no longer depreciated. See Note 2, “Change in Control Transaction,” Note 5, “Property, Plant and Equipment,” and Note 7, “Intangible Assets,” for additional information about these assets.
	Internal Use Software
	We monitor the activities of each of our internal use software and system development projects and analyze the associated costs, making an appropriate distinction between costs to be expensed and costs to be capitalized. Costs incurred during the preliminary project stage are expensed as incurred. Many of the costs incurred during the application development stage are capitalized, including costs of software design and configuration, development of interfaces, coding, testing and installation of the software. Once the software is ready for its intended use, it is amortized on a straight-line basis over its useful life, generally three to seven years.
	Impairment of Long-Lived Assets
	We review long-lived assets that are subject to amortization for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized equal to the amount by which the carrying amount of the asset exceeds the fair value of the asset. No significant impairment charges were recorded during 2014, 2013, or 2012.
Marketable Securities	Marketable Securities
	We classify our investments in debt and equity securities in accordance with our intent and ability to hold the investments. Held-to-maturity securities are carried at amortized cost, which approximates fair value, and are classified as either short-term or long-term investments based on the contractual maturity date. Earnings from these securities are reported as a component of interest income. Available-for-sale securities are carried at fair market value, with the unrealized gains and losses, net of tax, included in accumulated other comprehensive income. Trading securities are carried at fair value, with unrealized gains and losses included in income.
	At December 31, 2014 and 2013, the Company's marketable securities consisted of trading securities and available-for-sale securities. The trading securities relate to a nonqualified deferred compensation plan held in trust for the benefit of plan participants. The available-for-sale securities relate to foreign exchange-traded corporate bonds. There were no significant realized or unrealized gains or losses for these securities for any of the periods presented. We follow fair value guidance to measure the fair value of our financial assets as further described in Note 16, "Fair Value."
	We periodically review our marketable securities to determine if there is an other-than-temporary impairment on any security. If it is determined that an other-than-temporary decline in value exists, we write down the investment to its market value and record the related impairment loss in other income. There were no other-than-temporary impairments of marketable securities in 2014, 2013, or 2012.
Goodwill and Other Indefinite-Lived Intangibles	Goodwill and Other Indefinite-Lived Intangibles
	Goodwill and other indefinite-lived intangible assets are allocated to various reporting units, which are an operating segment or one level below an operating segment. We test goodwill and indefinite-lived intangible assets for impairment on an annual basis, in the fourth quarter, or on an interim basis if an indicator of impairment is present. For goodwill, we compare the fair value of each reporting unit to its carrying amount to determine if there is potential goodwill impairment. If the fair value of a reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the fair value of the goodwill within the reporting unit is less than the carrying value of its goodwill. For other indefinite-lived intangibles, we compare the fair value of the asset to its carrying value to determine if there is an impairment. If the fair value of the asset is less than its carrying value, an impairment loss is recorded. We use discounted cash flow techniques to determine the fair value of our reporting units and other indefinite-lived intangibles. See Note 6, “Goodwill,” and Note 7, “Intangible Assets,” for additional information about these assets.
Benefit Plans	Benefit Plans
	We maintain a 401(k) defined contribution profit sharing plan for eligible employees. We provide a partial matching contribution and a discretionary contribution based on a fixed percentage of a participant’s eligible compensation. Contributions to this plan for the years ended December 31, 2014 and 2013, and from the date of inception through December 31, 2012, were $14.1 million, $12.4 million and $6.9 million, respectively. Contributions to this plan by TransUnion Intermediate Predecessor for the four months ended April 30, 2012, were $4.8 million. We also maintain a nonqualified deferred compensation plan for certain key employees. The deferred compensation plan contains both employee deferred compensation and company contributions. These investments are held in the TransUnion Rabbi Trust, and are included in marketable securities in the consolidated balance sheets. The assets held in the Rabbi Trust are for the benefit of the participants in the deferred compensation plan, but are available to our general creditors in the case of our insolvency. The liability for amounts due to these participants is included in other current liabilities and other liabilities in the consolidated balance sheets.
Recently adopted accounting pronouncements	Recently Adopted Accounting Pronouncements
	On July 18, 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exist. ASU No. 2013-11 provides guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses or tax credit carryforwards exist. ASU No. 2013-11 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. This guidance was adopted by the Company effective January 1, 2014, and did not result in a material change in the Company’s consolidated financial statements. See Note 14, "Income Taxes," for further details regarding the impact of this adoption.
Recent Accounting Pronouncement not yet Adopted	Recent Accounting Pronouncement Not Yet Adopted
	On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This comprehensive guidance will replace all existing revenue recognition guidance and is effective for annual reporting periods beginning after December 15, 2016, and interim periods therein. We are currently assessing the impact this guidance will have on our consolidated financial statements once it is adopted.
	On June 19, 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. This update clarifies the accounting for share-based awards with performance targets and is effective for years beginning after December 15, 2015. We are currently assessing the impact this guidance will have on our consolidated financial statements.

Change_in_Control_Transactions1

Change in Control Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Allocation of purchase price value of the assets acquired and the liabilities assumed	The allocation of the purchase price to the identifiable assets acquired and liabilities assumed as of April 30, 2012, consisted of the following:
	(in millions)	Fair Value
	Trade accounts receivable	$	162.4
	Property and equipment	112.9
	Identifiable intangible assets	1,986.40
	Goodwill(1)	1,794.80
	All other assets	302.3
	Total assets acquired	$	4,358.80
	Existing debt (including fair value adjustment)	(1,710.8		)
	All other liabilities	(945.4		)
	Noncontrolling interests	(109.9		)
	Net assets of acquired company	$	1,592.70
	(1)	For tax purposes, $128.8 million of goodwill is tax deductible.
Identifiable Intangible Assets	The fair values of the intangible assets acquired consisted of the following:
	(in millions)	Fair Value			Estimated
					Useful Life
	Database and credit files	$	765		15 years
	Technology and software	364.6			7 years
	Trade names and trademarks	546.1			40 years
	Customer relationships	308			20 years
	Other	2.7			5 years
	Total identifiable intangible assets	$	1,986.40

Business_Acquisitions_Tables

Business Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The allocation of the purchase price to the identifiable assets acquired and liabilities assumed as of April 30, 2012, consisted of the following:
	(in millions)	Fair Value
	Trade accounts receivable	$	162.4
	Property and equipment	112.9
	Identifiable intangible assets	1,986.40
	Goodwill(1)	1,794.80
	All other assets	302.3
	Total assets acquired	$	4,358.80
	Existing debt (including fair value adjustment)	(1,710.8		)
	All other liabilities	(945.4		)
	Noncontrolling interests	(109.9		)
	Net assets of acquired company	$	1,592.70
	(1)	For tax purposes, $128.8 million of goodwill is tax deductible.
Fair Values of Intangible Assets	The fair values of the intangible assets acquired consisted of the following:
	(in millions)	Fair Value			Estimated
					Useful Life
	Database and credit files	$	765		15 years
	Technology and software	364.6			7 years
	Trade names and trademarks	546.1			40 years
	Customer relationships	308			20 years
	Other	2.7			5 years
	Total identifiable intangible assets	$	1,986.40
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Intangible assets consisted of the following:
		31-Dec-14								31-Dec-13
	(in millions)	Gross			Accumulated			Net		Gross		Accumulated			Net
					Amortization							Amortization
	Database and credit files	$	801.3		$	(135.8	)	$	665.5	$	761.8	$	(84.3	)	$	677.5
	Internal use software	580			(187.3		)	392.7		510.4		(94.7		)	415.7
	Customer relationships	392.4			(46.0		)	346.4		336.1		(25.8		)	310.3
	Trademarks, copyrights and patents	571.5			(37.9		)	533.6		550.7		(22.2		)	528.5
	Noncompete and other agreements	2.2			(0.8		)	1.4		2.5		(0.5		)	2
	Total intangible assets	$	2,347.40		$	(407.8	)	$	1,939.60	$	2,161.50	$	(227.5	)	$	1,934.00
TLO [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The fair value of the assets acquired and liabilities assumed consisted of the following:
	(in millions)	Fair Value
	Other current assets	$	0.3
	Property and equipment	6.8
	Identifiable intangible assets	83.1
	Goodwill(1)	69.2
	Total assets acquired	$	159.4
	Total liabilities assumed	(6.0		)
	Net assets of acquired company	$	153.4
	(1)	All of the goodwill is deductible for tax purposes.
Schedule of Finite-Lived Intangible Assets [Table Text Block]	The fair values of the intangible assets acquired consisted of the following:
	(in millions)		Fair Value			Estimated Useful Life
	Technology and software		$	45.8		7 years
	Trade names and trademarks		13.2			20 years
	Customer relationships		24.1			15 years
	Total identifiable intangible assets		$	83.1

Other_Current_Assets_Tables

Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Other Current Assets [Line Items]
Other current assets	Other current assets consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Deferred income tax assets	$	51.2	$	22.1
	Prepaid expenses	43.4		34.9
	Other investments	8.8		—
	Deferred financing fees	8.2		6.8
	Marketable securities	3		—
	Income taxes receivable	2.8		6.8
	Other	5.3		2.9
	Total other current assets	$	122.7	$	73.5

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, plant and equipment	Property, plant and equipment, including those acquired by capital lease, consisted of the following:
	(in millions)	December 31, 2014			December 31, 2013
	Computer equipment and furniture	$	153.1		$	107.8
	Building and building improvements	89			64.3
	Purchased software	59.5			45.3
	Land	3.2			3.2
	Total cost of property, plant and equipment	304.8			220.6
	Less: accumulated depreciation	(123.4		)	(70.2		)
	Total property, plant and equipment, net of accumulated depreciation	$	181.4		$	150.4

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill [Abstract]
Changes in the carrying amount of goodwill	Goodwill allocated to our segments as of December 31, 2014, December 31, 2013, and December 31, 2012, and the changes in the carrying amount of goodwill during those periods consisted of the following:
	(in millions)	USIS			International			Consumer Interactive			Total
	Balance, December 31, 2012	$	1,135.30		$	532.1		$	136.8		$	1,804.20
	Purchase accounting adjustments	(4.7		)	(3.8		)	(0.6		)	(9.1		)
	Acquisitions	125.9			25.4			—			151.3
	Tax deductible goodwill adjustment	—			(2.1		)	—			(2.1		)
	Foreign exchange rate adjustment	—			(33.9		)	—			(33.9		)
	Sale of Africa subsidiary	—			(0.7		)	—			(0.7		)
	Balance, December 31, 2013	$	1,256.50		$	517		$	136.2		$	1,909.70
	Purchase accounting adjustments	10.3			—			—			10.3
	Acquisitions	40.8			92.9			—			133.7
	Foreign exchange rate adjustment	—			(29.8		)	—			(29.8		)
	Balance, December 31, 2014	$	1,307.60		$	580.1		$	136.2		$	2,023.90

Intangible_Assets_Tables

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets	Intangible assets consisted of the following:
		31-Dec-14							31-Dec-13
	(in millions)	Gross		Accumulated			Net		Gross		Accumulated			Net
				Amortization							Amortization
	Database and credit files	$	801.3	$	(135.8	)	$	665.5	$	761.8	$	(84.3	)	$	677.5
	Internal use software	580		(187.3		)	392.7		510.4		(94.7		)	415.7
	Customer relationships	392.4		(46.0		)	346.4		336.1		(25.8		)	310.3
	Trademarks, copyrights and patents	571.5		(37.9		)	533.6		550.7		(22.2		)	528.5
	Noncompete and other agreements	2.2		(0.8		)	1.4		2.5		(0.5		)	2
	Total intangible assets	$	2,347.40	$	(407.8	)	$	1,939.60	$	2,161.50	$	(227.5	)	$	1,934.00
Estimated future amortization expense related to purchased intangible	Estimated future amortization expense related to purchased intangible assets at December 31, 2014, is as follows:
	(in millions)	Annual
		Amortization
		Expense
	2015	$	214.3
	2016	180.1
	2017	146.2
	2018	134
	2019	115.6
	Thereafter	1,149.40
	Total future amortization expense	$	1,939.60

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Other assets	Other assets consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Investments in affiliated companies	$	52.8	$	92.4
	Deferred financing fees	25.8		29.7
	Other investments	18.8		—
	Deposits	11.5		15.8
	Marketable securities	10.9		9.9
	Other	0.1		0.7
	Total other assets	$	119.9	$	148.5

Investment_in_Affiliated_Compa

Investment in Affiliated Companies (Tables)	12 Months Ended
	Dec. 31, 2014
Investments in Affiliated Companies [Abstract]
Summary of Investments in affiliated companies	Investments in affiliated companies consisted of the following:
	(in millions)	December 31,			December 31,
		2014			2013
	Trans Union de Mexico, S.A. (25.69% ownership interest)	$	45		$	50
	Credit Information Bureau (India) Ltd. ("CIBIL", 27.5% ownership interest in 2013)	—			28.4
	All other equity method investments	6.9			6.1
	Total equity method investments	$	51.9		$	84.5
	Total cost method investments	0.9			7.9
	Total investments in affiliated companies	$	52.8		$	92.4
Schedule of equity investments income statement information	Earnings from equity method investments, which are included in other non-operating income and expense, and dividends received from equity method investments consisted of the following:
			Successor							Predecessor
	(in millions)		Twelve Months Ended December, 2014			Twelve Months Ended December, 2013		From the Date of		Four Months
								Inception through		Ended
								31-Dec-12		April 30, 2012
	Earnings from equity method investments		$	12.5		$	13.7	$	8	$	4.1
	Dividends received from equity method investments		$	9.2		$	10.1	$	9.3	$	0.4
Significant equity method investments - summarized financial information balance sheet	The summarized financial information and earnings for our equity method investments as required by SEC Regulation S-X, Rule 1-02(bb)(i) and (ii) consisted of the following:
	(in millions)		31-Dec-14			31-Dec-13
	Current assets		$	57.8		$	83
	Noncurrent assets		$	14.7		$	24.6
	Current liabilities		$	18		$	26.3
	Noncurrent liabilities		$	0.1		$	1.4
Equity method investment summarized financial information
			Successor							Predecessor
	(in millions)		Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013		From the Date of Inception through December 31, 2012		Four Months Ended April 30, 2012
	Revenue		$	124.9		$	132.6	$	82.4	$	40.9
	Operating income		$	55.7		$	57.7	$	34.4	$	16.9
	Income from continuing operations		$	43.9		$	48.2	$	28.6	$	14.1
	Net income		$	43.9		$	48.2	$	28.6	$	14.1

Other_Current_Liabilities_Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Other current liabilities	Other current liabilities consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Accrued payroll	$	71.5	$	63.7
	Accrued interest	20.5		23.1
	Accrued legal and regulatory	17.8		13.8
	Accrued employee benefits	13		9.6
	Deferred revenue	8.6		9.1
	Other	18		14.2
	Total other current liabilities	$	149.4	$	133.5

Other_Liabilities_Tables

Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Other Liabilities [Line Items]
Schedule of Other Non Current Liabilities	Other liabilities consisted of the following:
	(in millions)	December 31,		December 31,
		2014		2013
	Retirement benefits	$	10.8	$	10.4
	Unrecognized tax benefits	0.3		4.6
	Other	11		7.6
	Total other liabilities	$	22.1	$	22.6

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Instruments [Abstract]
Debt outstanding	Debt outstanding consisted of the following:
	(in millions)	December 31,			December 31,
		2014			2013
	Senior secured term loan, payable in quarterly installments through April 9, 2021, including variable interest (4.00% at December 31, 2014) at LIBOR or alternate base rate, plus applicable margin, including original discount (premium) of $4.3 million and $(0.2) million at December 31, 2014, and December 31, 2013, respectively	$	1,881.50		$	1,123.50
	Senior secured revolving line of credit, due on April 9, 2019, variable interest (3.75% at December 31, 2014) at LIBOR or alternate base rate, plus applicable margin	50			—
	11.375% Senior Notes - Senior notes, principal due June 15, 2018, (paid in full in May 2014) semi-annual interest payments, 11.375% fixed interest per annum, including unamortized fair value adjustment of $95.9 million as of December 31, 2013	—			740.9
	9.625% Senior Notes - Senior unsecured PIK toggle notes, principal due June 15, 2018, semi-annual interest payments, 9.625% fixed interest per annum	600			600
	8.125% Senior Notes - Senior unsecured PIK toggle notes, principal due June 15, 2018, semi-annual interest payments, 8.125% fixed interest per annum, including original issuance discount of $1.3 million and $1.7 million at December 31, 2014, and December 31, 2013, respectively	398.7			398.3
	Other notes payable	7.4			—
	Capital lease obligations	2.3			4.2
	Total debt	$	2,939.90		$	2,866.90
	Less short-term debt and current portion of long-term debt	(74.0		)	(13.8		)
	Total long-term debt	$	2,865.90		$	2,853.10
Scheduled future maturities	Excluding potential additional principal payments due on the senior secured credit facility based on excess cash flows of the prior year, scheduled future maturities of total debt at December 31, 2014, was as follows:
	(in millions)
	2015	$	74
	2016	23.4
	2017	19.4
	2018	1,019.00
	2019	19
	Thereafter	1,790.70
	Unamortized premiums and discounts on notes	(5.6		)
	Total	$	2,939.90

Earnings_per_share_Tables

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted
		Successor									Predecessor
	(in millions)	Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013			From the Date of Inception through December 31, 2012			Four Months Ended April 30, 2012
	Earnings per share - basic
	Earnings available to common shareholders	$	(12.5	)	$	(35.1	)	$	(8.8	)	$	(54.9	)
	Weighted average shares outstanding	110.5			109.9			109.7			29.8
	Earnings per share - basic	$	(0.11	)	$	(0.32	)	$	(0.08	)	$	(1.84	)
	Earnings per share - diluted
	Earnings available to common shareholders	$	(12.5	)	$	(35.1	)	$	(8.8	)	$	(54.9	)
	Weighted average shares outstanding	110.5			109.9			109.7			29.8
	Dilutive impact of stock based awards	—			—			—			—
	Weighted average dilutive shares outstanding	110.5			109.9			109.7			29.8
	Earnings per share - diluted	$	(0.11	)	$	(0.32	)	$	(0.08	)	$	(1.84	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Details of provision (benefit) for income taxes on income (loss) from continuing operations	The provision (benefit) for income taxes on income (loss) from operations consisted of the following:
		Successor											Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013			From Date of Inception Through December 31, 2012				Four Months Ended April 30,
													2012
	Federal
	Current	$	(0.1	)		$	0.1		$	0.1			$	1
	Deferred	(15.9		)		(15.5		)	(3.0		)		(16.1		)
	State
	Current	0.4				—			(0.5		)		0.1
	Deferred	0.1				(0.3		)	(0.3		)		(1.5		)
	Foreign
	Current	23.1				18.4			12.1				5.7
	Deferred	(5.0		)		(0.4		)	(1.8		)		(0.7		)
	Total provision (benefit) for income taxes	$	2.6			$	2.3		$	6.6			$	(11.5	)
Summary of components of income (loss) from continuing operations before income taxes	The components of income (loss) from operations before income taxes consisted of the following:
		Successor											Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013			From Date of Inception Through December 31, 2012				Four Months Ended April 30,
													2012
	Domestic	$	(54.1	)		$	(72.9	)	$	(33.3	)		$	(79.5	)
	Foreign	52.3				47			36				15.6
	Total income (loss) from operations before income taxes	$	(1.8	)		$	(25.9	)	$	2.7			$	(63.9	)
Reconciliation of the U.S. federal statutory tax rate to our effective tax rate
	The effective income tax rate reconciliation consisted of the following:
			Successor																	Predecessor
	(in millions)		Twelve Months Ended December 31, 2014						Twelve Months Ended December 31, 2013						From Date of Inception Through December 31, 2012					Four Months Ended April 30, 2012
	Income taxes at 35% statutory rate		$	(0.6	)		35	%	$	(9.1	)	35	%		$	0.9		35	%	$	(22.4	)	35	%
	Increase (decrease) resulting from:
	State taxes		0.4				(23.9	)%	(0.1		)	0.4	%		(0.9		)	(35.0	)%	(1.4		)	2.2	%
	Foreign rate differential		(1.8		)		98.7	%	(0.9		)	3.5	%		(4.0		)	(148.1	)%	(1.2		)	1.9	%
	Change in control transaction expenses		—				—		—			—			1.8			66.7	%	2.7			(4.2	)%
	Application of indefinite reinvestment assertion to to foreign earnings		5.6				(308.4	)%	15.1			(58.0	)%		4.3			159.2	%	8.1			(12.7	)%
	Impact of foreign dividends		—				(1.6	)%	(1.7		)	6.4	%		5			185.2	%	2			(3.1	)%
	Other		(1.0		)		56	%	(1.0		)	3.9	%		(0.5		)	(18.6	)%	0.7			(1.1	)%
	Total		$	2.6			(144.2	)%	$	2.3		(8.8	)%		$	6.6		244.4	%	$	(11.5	)	18	%
Components of net deferred income tax	Components of net deferred income tax consisted of the following:
	(in millions)	December 31,				December 31,
		2014				2013
	Deferred income tax assets:
	Compensation	$	9.8			$	6.8
	Employee benefits	7.8				6.3
	Legal reserves and settlements	5.3				3.5
	Hedge investments	0.7				0.4
	Financing related costs	3.6				39.4
	Loss and credit carryforwards	110.7				72.5
	Other	8.6				8.6
	Gross deferred income tax assets	146.5				137.5
	Valuation allowance	(42.1		)		(25.9		)
	Total deferred income tax assets, net	$	104.4			$	111.6
	Deferred income tax liabilities:
	Depreciation and amortization	$	(663.3	)		$	(647.3	)
	Investments in affiliated companies	(15.0		)		(17.1		)
	Taxes on undistributed foreign earnings	(50.4		)		(57.1		)
	Other	(1.3		)		(4.9		)
	Total deferred income tax liability	(730.0		)		(726.4		)
	Net deferred income tax liability	$	(625.6	)		$	(614.8	)
Total amount of unrecognized tax benefits	The total amount of unrecognized tax benefits consisted of the following:
	(in millions)	December 31,				December 31,
		2014				2013
	Balance as of beginning of period	$	4.6			$	4.9
	Reductions for tax positions of prior years	—				(0.1		)
	Reductions relating to settlement and lapse of statute	(2.7		)		(0.2		)
	Balance as of end of period	$	1.9			$	4.6

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Schedule of assumptions used to value the service condition options and the weighted-average grant date fair value	The assumptions used to value the service condition options and the weighted-average grant date fair value for the periods presented were as follows:
		Successor											Predecessor
		Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From Date of Inception Through December 31, 2012			Four Months Ended April 30, 2012
	Service condition options:
	Dividend yield	—				—				—			—
	Expected volatility	55%-60%				60%-70%				59		%	30		%
	Risk-free interest rate	0.9%-2.3%				0.9%-1.0%				0.9		%	2.4		%
	Expected life, in years	5.9-6.4				5.9-6.1				6.2			6.5
	Weighted-average grant date fair value	$	8.16			$	5.61			$	4.97		$	15.74
	Market condition options:
	Weighted-average grant date fair value	$	7.45			$	5.19			$	4.08		$	15.15
Stock options granted	Stock option activity as of and for the years ended December 31, 2014 and December 31, 2013, consisted of the following:
	(in millions, except share and per share information)	Shares			Weighted				Weighted		Aggregate
					Average				Average		Intrinsic
					Exercise				Remaining		Value
					Price				Contractual		(in millions)
									Term
									(in years)
	Outstanding at December 31, 2013	7,106,389			$	7.46			8.8		$	28.2
	Granted	1,461,865			$	14.76
	Exercised	(164,484	)		$	6.65
	Forfeited	(717,973	)		$	8.64
	Expired	(1,350	)		$	6.65
	Outstanding at December 31, 2014	7,684,447			$	8.83			8.2		$	65.8
	Fully vested and expected to vest at December 31, 2014	7,022,716			$	8.83			8.2		$	60.2
	Exercisable at December 31, 2014	995,418			$	7.17			7.9		$	10.2
Intrinsic value of options exercised and fair value of options vested	The intrinsic value of options exercised and the fair value of options vested for the periods presented are as follows:
			Successor											Predecessor
	(in millions)		Year Ended December 31, 2014				Year Ended December 31, 2013				From Date of Inception Through December 31, 2012			Four Months Ended April 30, 2012
	Intrinsic value of options exercised		$	1.1			$	0.5			$	—		$	—
	Total fair value of options vested		$	3			$	3.7			$	—		$	18.2

Fair_Value_Tables

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Financial instruments measured at fair value, on a recurring basis	The following table summarizes financial instruments measured at fair value, on a recurring basis, as of December 31, 2014:
	(in millions)	Total			Level 1		Level 2			Level 3
	Assets
	Trading securities	$	10.9		$	6.6	$	4.3		$	—
	Available for sale securities	3			—		3			—
	Total	$	13.9		$	6.6	$	7.3		$	—
	Liabilities
	Contingent obligation	$	(5.0	)	$	—	$	—		$	(5.0	)
	Interest rate swaps	(2.0		)	—		(2.0		)	—
	Total	$	(7.0	)	$	—	$	(2.0	)	$	(5.0	)

Operating_Segments_Tables

Operating Segments (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of segment reporting information, by segment	Selected financial information consisted of the following:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception through December 31, 2012				Four Months
														Ended April 30, 2012
	Revenue
	U.S. Information Services	$	818.6			$	740.6			$	487.4			$	238.1
	International	255.5				238.9				157.8				76.6
	Consumer Interactive	230.6				203.7				121.8				58.3
	Total	$	1,304.70			$	1,183.20			$	767			$	373
	Operating income (loss)
	U.S. Information Services	$	112.8			$	154.7			$	121.9			$	33.2
	International	22.2				19.5				19.1				5.3
	Consumer Interactive	85.5				65.6				48.7				13
	Corporate	(92.1		)		(70.6		)		(48.5		)		(51.7		)
	Total	$	128.4			$	169.2			$	141.2			$	(0.2	)
	Reconciliation of operating income (loss) to income (loss) from operations before income tax:
	Operating income from segments	$	128.4			$	169.2			$	141.2			$	(0.2	)
	Non-operating income and expense	(130.2		)		(195.1		)		(138.5		)		(63.7		)
	Income (loss) from operations before income tax	$	(1.8	)		$	(25.9	)		$	2.7			$	(63.9	)
Other income and expense, net, included earnings (losses) from equity method investments	Earnings from equity method investments, included in non-operating income and expense was as follows:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception through December 31, 2012				Four Months
														Ended April 30, 2012
	U.S. Information Services	$	1.2			$	1.4			$	0.9			$	0.5
	International	11.3				12.3				7.1				3.6
	Total	$	12.5			$	13.7			$	8			$	4.1
Property, plant and equipment, net of accumulated depreciation and amortization, by segment	Total assets, by segment, consisted of the following:
	(in millions)	December 31,					December 31,
		2014					2013
	U.S. Information Services	$	2,932.80				$	2,894.70
	International	1,268.10					1,166.80
	Consumer Interactive	268.8					268.3
	Corporate	196.1					162.5
	Total	$	4,665.80				$	4,492.30
Cash paid for capital expenditures, by segment	Cash paid for capital expenditures, by segment, was as follows:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception through December 31, 2012				Four Months Ended April 30, 2012
	U.S. Information Services	$	99.6			$	46.9			$	30.8			$	14.3
	International	30.1				17.1				8.6				2.4
	Consumer Interactive	5.3				3.9				2.8				1.3
	Corporate	20.2				13.8				6.6				2.4
	Total	$	155.2			$	81.7			$	48.8			$	20.4
Depreciation and amortization expense of continuing operations, by segment	Depreciation and amortization expense by segment was as follows:
		Successor												Predecessor
	(in millions)	Twelve Months Ended December 31, 2014				Twelve Months Ended December 31, 2013				From the Date of Inception Through December 31, 2012				Four Months
														Ended April 30, 2012
	U.S. Information Services	$	174.3			$	129.3			$	78.9			$	22.3
	International	51				39.9				25.8				3.7
	Consumer Interactive	10.3				8.9				5.2				1.3
	Corporate	5.6				8.7				5.1				1.9
	Total	$	241.2			$	186.8			$	115			$	29.2
Revenue based on the country	Percentage of revenue based on the country where it was earned, was as follows:
		Successor										Predecessor
	(in millions)	Twelve Months Ended December 31, 2014			Twelve Months Ended December 31, 2013			From the Date of Inception Through December 31, 2012				Four Months
												Ended April 30, 2012
	United States	80	%		80	%		79	%			79	%
	South Africa	6	%		6	%		7	%			8	%
	Canada	5	%		5	%		5	%			6	%
	Other	9	%		9	%		9	%			7	%
Long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset	Percentage of long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset, was as follows:
		Percent of Long-Lived
		Assets
	Country	2014			2013			2012
	United States	82	%		85	%		81	%
	South Africa	3	%		3	%		5	%
	Canada	3	%		3	%		4	%
	Other	12	%		9	%		10	%

Commitments_Tables

Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments [Abstract]
Summary of future minimum payments for noncancelable operating leases, purchase obligations and other liabilities	Future minimum payments for noncancelable operating leases, purchase obligations and other liabilities of the Company in effect as of December 31, 2014, are payable as follows:
	(in millions)	Operating		Purchase		Total
		Leases		Obligations
	2015	$	12.8	$	182	$	194.8
	2016	9.9		31.9		41.8
	2017	7		11.1		18.1
	2018	5.4		6.7		12.1
	2019	5		1.1		6.1
	Thereafter	11.8		2.5		14.3
	Totals	$	51.9	$	235.3	$	287.2

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Interim Period, Costs Not Allocable [Line Items]
Summary of quarterly financial data	The quarterly financial data for 2014 and 2013 consisted of the following:
		Three Months Ended
	(in millions)	December 31,			September 30,			June 30,			March  31,
		2014			2014			2014			2014
	Revenue	$	335.6		$	338.2		$	327.5		$	303.4
	Operating income	20.4			40.8			32.4			34.8
	Net income (loss)	(10.7		)	(0.1		)	19.9			(13.5		)
	Net income (loss) attributable to TransUnion	(13.1		)	(2.6		)	17.9			(14.7		)
	Earnings per share:
	Basic	$	(0.12	)	$	(0.02	)	$	0.16		$	(0.13	)
	Diluted	$	(0.12	)	$	(0.02	)	$	0.16		$	(0.13	)
		Three Months Ended
	(in millions)	December 31,			September 30,			June 30,			March  31,
		2013			2013			2013			2013
	Revenue	$	292.4		$	299.5		$	300.8		$	290.5
	Operating income	36.2			49.3			39.5			44.2
	Net income (loss)	(15.7		)	(1.4		)	(6.1		)	(5.0		)
	Net income (loss) attributable to TransUnion	(17.6		)	(3.4		)	(7.8		)	(6.3		)
	Earnings per share:
	Basic	$	(0.16	)	$	(0.03	)	$	(0.07	)	$	(0.06	)
	Diluted	$	(0.16	)	$	(0.03	)	$	(0.07	)	$	(0.06	)

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Component accumulated other comprehensive income (loss)	The following table sets forth the changes in each component of accumulated other comprehensive income (loss), net of tax:
	(in millions)	Foreign			Net			Net		Accumulated
		Currency			Unrealized			Unrealized		Other
		Translation			Gain/(Loss)			Gain/(Loss)		Comprehensive
		Adjustment			On Hedges			On Available-for-sale Securities		Income /
										(Loss)
	Predecessor balance, December 31, 2011	$	(3.6	)	$	—		$	—	$	(3.6	)
	Change	2.2			—			—		2.2
	Predecessor balance, April 30, 2012	$	(1.4	)	$	—		$	—	$	(1.4	)
	Purchase accounting adjustments	1.4			—			—		1.4
	Change	(20.7		)	(3.7		)	—		(24.4		)
	Successor balance, December 31, 2012	$	(20.7	)	$	(3.7	)	$	—	$	(24.4	)
	Change	(51.9		)	3.1			—		(48.8		)
	Successor balance, December 31, 2013	$	(72.6	)	$	(0.6	)	$	—	$	(73.2	)
	Change	(44.2		)	(0.2		)	0.1		(44.3		)
	Successor balance, December 31, 2014	$	(116.8	)	$	(0.8	)	$	0.1	$	(117.5	)

Significant_Accounting_and_Rep2

Significant Accounting and Reporting Policies (Details Textual) (USD $)	8 Months Ended	10 Months Ended	12 Months Ended			0 Months Ended	4 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 21, 2012	Apr. 30, 2012
			Segment
TransUnion Intermediate-Predecessor
Summary of Significant Accounting Policies (Textual) [Abstract]
Business acquisition, percentage of voting interests acquired							100.00%
TransUnion [Member] | TransUnion [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Advertising costs		$19,200,000	$31,300,000	$32,300,000
Exchange rate gains (losses)		100,000	-1,100,000	-800,000
Expenses related to defined contribution profit sharing plan	6,900,000		14,100,000	12,400,000
Other-than-temporary impairments of marketable securities				0
Impairment of intangible assets, finite-lived			0	0	0
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Ownership interest			20.00%
Nonmarketable investments in TransUnion Corp			20.00%
Number of operating segments			3
TransUnion [Member] | TransUnion [Member] | Common Stock [Member]
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Change in Accounting Estimate, Financial Effect			0.1
TransUnion [Member] | TransUnion [Member] | Effect On Operating Income [Member]
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Change in Accounting Estimate, Financial Effect			17.5
TransUnion [Member] | TransUnion [Member] | Effect on Net Income [Member]
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Change in Accounting Estimate, Financial Effect			11.2
TransUnion [Member] | TransUnion [Member] | Building and Building Improvements [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life of the asset			20 years
TransUnion [Member] | TransUnion [Member] | Net Unrealized Gain/(Loss) On Available-for-sale Securities
Summary of Significant Accounting Policies (Textual) [Abstract]
Other-than-temporary impairments of marketable securities			0	0	0
TransUnion [Member] | TransUnion [Member] | 9.625% notes
Summary of Significant Accounting Policies (Textual) [Abstract]
Senior notes issued notes to investor			600,000,000			600,000,000
Interest rate			9.63%			9.63%	9.63%
PIK rate percentage on notes			10.38%			10.38%
Senior notes issued notes to investor			600,000,000			600,000,000
Interest rate			9.63%			9.63%	9.63%
PIK rate percentage on notes			10.38%			10.38%
Senior Note Maturity Date			15-Jun-18			15-Jun-18
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Summary of Significant Accounting Policies (Textual) [Abstract]
Advertising costs							15,500,000
Exchange rate gains (losses)							200,000
Expenses related to defined contribution profit sharing plan							$4,800,000
Minimum [Member] | TransUnion [Member] | TransUnion [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life			3 years
Minimum [Member] | TransUnion [Member] | TransUnion [Member] | Internal Use Software [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life			3 years
Minimum [Member] | TransUnion [Member] | TransUnion [Member] | Computer Equipment and Purchased Software [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life of the asset			3 years
Minimum [Member] | TransUnion [Member] | TransUnion [Member] | Leasehold Improvements [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life of the asset			5 years
Maximum [Member] | TransUnion [Member] | TransUnion [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life			40 years
Maximum [Member] | TransUnion [Member] | TransUnion [Member] | Internal Use Software [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life			7 years
Maximum [Member] | TransUnion [Member] | TransUnion [Member] | Computer Equipment and Purchased Software [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life of the asset			7 years
Maximum [Member] | TransUnion [Member] | TransUnion [Member] | Leasehold Improvements [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life of the asset			7 years

Change_in_Control_Transactions2

Change in Control Transactions (Details) (USD $)	Apr. 30, 2012
In Millions, unless otherwise specified
Allocation of purchase price value of the assets acquired and the liabilities assumed
Identifiable intangible assets	$1,986.40
TransUnion Change in Control [Member]
Allocation of purchase price value of the assets acquired and the liabilities assumed
Trade accounts receivable	162.4
Property and equipment	112.9
Identifiable intangible assets	1,986.40
Goodwill	1,794.80
All other assets	302.3
Total assets acquired	4,358.80
Existing debt (including fair value adjustment)	-1,710.80
All other liabilities	-945.4
Noncontrolling interests	-109.9
Net assets of acquired company	$1,592.70

Change_in_Control_Transactions3

Change in Control Transactions (Details 1) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$1,986.40
Database and credit files [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	765
Identifiable Intangible Assets
Estimated useful life	15 years
Technology and software [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	364.6
Identifiable Intangible Assets
Estimated useful life	7 years
Trade names and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	546.1
Identifiable Intangible Assets
Estimated useful life	40 years
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	308
Identifiable Intangible Assets
Estimated useful life	20 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$2.70
Identifiable Intangible Assets
Estimated useful life	5 years

Change_in_Control_Transactions4

Change in Control Transactions (Details Textual) (USD $)	1 Months Ended	12 Months Ended	10 Months Ended	12 Months Ended		4 Months Ended
	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012	Mar. 21, 2012
Change in Control Transactions (Textual) [Abstract]
Merger Agreement, TransUnion Holding	30-Apr-12
Aggregate purchase price	$1,592,700,000
Change in Control Transactions (Additional Textual) [Abstract]
Business Combination, goodwill tax deductible	128,800,000					128,800,000
Acquisition costs		36,500,000
TransUnion [Member] | TransUnion [Member]
Change in Control Transactions (Additional Textual) [Abstract]
Weighted-average useful life of identifiable intangible assets				21 years
Repayment of bank debt			17,200,000	25,600,000	11,900,000
(Provision) benefit for income taxes			-6,600,000	-2,600,000	-2,300,000
Acquisition costs			15,600,000	500,000	3,700,000
TransUnion [Member] | 9.625% notes | TransUnion [Member]
Change in Control Transactions (Textual) [Abstract]
Senior unsecured debt raised							600,000,000
Short-term Debt [Line Items]
Senior notes issued notes to investor				600,000,000			600,000,000
Change in Control Transactions (Additional Textual) [Abstract]
Interest rate	9.63%			9.63%		9.63%	9.63%
TransUnion Intermediate-Predecessor
Change in Control Transactions (Textual) [Abstract]
Business acquisition, percentage of voting interests acquired	100.00%					100.00%
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Change in Control Transactions (Textual) [Abstract]
Debt Related Commitment Fees and Debt Issuance Costs						2,700,000
Change in Control Transactions (Additional Textual) [Abstract]
Repayment of bank debt						14,600,000
(Provision) benefit for income taxes						11,500,000
Acquisition costs						$20,900,000
Management [Member] | TransUnion [Member] | TransUnion [Member]
Change in Control Transactions (Textual) [Abstract]
Business acquisition, percentage of voting interests acquired	1.00%					1.00%
Affiliates of Advent [Member] | TransUnion [Member] | TransUnion [Member]
Change in Control Transactions (Textual) [Abstract]
Business acquisition, percentage of voting interests acquired	49.50%					49.50%
Affiliates of GSC [Member] | TransUnion [Member] | TransUnion [Member]
Change in Control Transactions (Textual) [Abstract]
Business acquisition, percentage of voting interests acquired	49.50%					49.50%

Business_Acquisitions_Details

Business Acquisitions (Details) (USD $)	12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 16, 2013	Apr. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	21-May-14	Oct. 17, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Identifiable intangible assets			$1,986.40
TransUnion [Member] | TransUnion [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	21 years
Goodwill	2,023.90			1,909.70	1,804.20
TransUnion [Member] | TransUnion [Member] | TLO [Member]
Business Acquisition [Line Items]
Trade accounts receivable		0.3
Ownership interest		100.00%
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 years 0 months
Net assets of acquired company		153.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		6.8
Identifiable intangible assets		83.1
Goodwill		69.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		159.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		$6
TransUnion [Member] | TransUnion [Member] | CIBIL [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent						55.00%
TransUnion [Member] | TransUnion [Member] | Cost Method Investment-L2C [Member]
Business Acquisition [Line Items]
Ownership interest							100.00%
cost method investment percentage								11.60%
TransUnion [Member] | TransUnion [Member] | Equity Method Significant Subsidiary - CIBIL [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage				27.50%

Business_Acquisitions_Details_

Business Acquisitions (Details 1) (USD $)	1 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 16, 2013	Dec. 31, 2014	Dec. 31, 2013
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
TransUnion [Member] | TransUnion [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net			$1,939.60	$1,934
TransUnion [Member] | TransUnion [Member] | TLO [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net		83.1
TransUnion [Member] | TransUnion [Member] | Technology-Based Intangible Assets [Member] | TLO [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net		45.8
Finite-Lived Intangible Asset, Useful Life		7 years 0 months
TransUnion [Member] | TransUnion [Member] | Trademarks and Trade Names [Member] | TLO [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net		13.2
Finite-Lived Intangible Asset, Useful Life		20 years
TransUnion [Member] | TransUnion [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net			346.4	310.3
TransUnion [Member] | TransUnion [Member] | Customer Relationships [Member] | TLO [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net		$24.10
Finite-Lived Intangible Asset, Useful Life		15 years 0 months

Business_Acquisitions_Details_1

Business Acquisitions (Details Textual) (USD $)	1 Months Ended	12 Months Ended	10 Months Ended	12 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 16, 2013	Sep. 04, 2013	Mar. 01, 2013	Nov. 12, 2014
Business Acquisitions (Textual) [Abstract]
Acquisition costs		$36.50
Sale of stock, consideration received on transaction	1,592.70
TransUnion [Member] | TransUnion [Member]
Business Acquisitions (Textual) [Abstract]
Acquisition costs			15.6	0.5	3.7
TransUnion [Member] | TransUnion [Member] | Databusiness [Member]
Business Acquisitions (Textual) [Abstract]
Ownership interest						100.00%
Sale of stock, consideration received on transaction						$153.40
TransUnion [Member] | TransUnion [Member] | eScan [Member]
Business Acquisitions (Textual) [Abstract]
Ownership interest							100.00%
TransUnion [Member] | TransUnion [Member] | ZipCode [Member]
Business Acquisitions (Textual) [Abstract]
Ownership interest								80.00%
TransUnion [Member] | TransUnion [Member] | DHI [Member]
Business Acquisitions (Textual) [Abstract]
Ownership interest									87.50%

Business_Acquisitions_Identifi

Business Acquisitions Identifiable Intangible Assets Table (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$1,939.60	$1,934

Other_Current_Assets_Details

Other Current Assets (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Time Deposits, $100,000 or More, Foreign	$0.10
Other current assets
Deferred income tax assets	51.2	22.1
Prepaid expenses	43.4	34.9
Other Short-term Investments	8.8	0
Income taxes receivable	2.8	6.8
Deferred financing fees	8.2	6.8
Marketable Securities, Current	3	0
Other	5.3	2.9
Total other current assets	$122.70	$73.50

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Property, plant and equipment
Computer equipment and furniture	$153.10	$107.80
Building and building improvements	89	64.3
Purchased software	59.5	45.3
Land	3.2	3.2
Total cost of property, plant and equipment	304.8	220.6
Less: accumulated depreciation	-123.4	-70.2
Property, plant and equipment, net of accumulated depreciation and amortization of $123.4 and $70.2	$181.40	$150.40

Property_Plant_and_Equipment_D1

Property, Plant and Equipment (Details Textual) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Property, Plant and Equipment (Textual) [Abstract]
Accumulated depreciation		$123.40	$70.20
Depreciation expense	26.7	56.7	44
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Property, Plant and Equipment (Textual) [Abstract]
Depreciation expense				$12.40

Goodwill_Details

Goodwill (Details) (TransUnion [Member], TransUnion [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Changes in the carrying amount of goodwill
Beginning balance	$1,909.70	$1,804.20
Acquisitions	133.7	151.3
Foreign exchange rate adjustment	-29.8	-33.9
Goodwill, written off related to sale of business unit		-0.7
Tax deductible goodwill adjustment		-2.1
Purchase accounting adjustments related to acquisition of TransUnion Corp	10.3	-9.1
Ending balance	2,023.90	1,909.70
USIS [Member]
Changes in the carrying amount of goodwill
Beginning balance	1,256.50	1,135.30
Acquisitions	40.8	125.9
Foreign exchange rate adjustment	0	0
Goodwill, written off related to sale of business unit		0
Tax deductible goodwill adjustment		0
Purchase accounting adjustments related to acquisition of TransUnion Corp	10.3	-4.7
Ending balance	1,307.60	1,256.50
International [Member]
Changes in the carrying amount of goodwill
Beginning balance	517	532.1
Acquisitions	92.9	25.4
Foreign exchange rate adjustment	-29.8	-33.9
Goodwill, written off related to sale of business unit		-0.7
Tax deductible goodwill adjustment		-2.1
Purchase accounting adjustments related to acquisition of TransUnion Corp	0	-3.8
Ending balance	580.1	517
Interactive [Member]
Changes in the carrying amount of goodwill
Beginning balance	136.2	136.8
Acquisitions	0	0
Foreign exchange rate adjustment	0	0
Goodwill, written off related to sale of business unit		0
Tax deductible goodwill adjustment		0
Purchase accounting adjustments related to acquisition of TransUnion Corp	0	-0.6
Ending balance	$136.20	$136.20

Goodwill_Details_Textual

Goodwill (Details Textual) (TransUnion [Member], TransUnion [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
TransUnion [Member] | TransUnion [Member]
Goodwill (Textual) [Abstract]
Goodwill impairment	$0	$0	$0
Accumulated goodwill impairment losses	$0
Discount Rate Sensitivity for Goodwill Impairment Analysis	0.00%
Cash flow sensitivity for goodwill impairment analysis	0.00%
Reporting Unit, Percentage of Fair Value in Excess of Carrying Value	5.00%

Intangible_Assets_Details

Intangible Assets (Details) (USD $)	1 Months Ended	12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2014	Dec. 16, 2013	Dec. 31, 2013
TransUnion [Member] | TransUnion [Member]
Intangible assets
Gross		$2,347.40		$2,161.50
Accumulated amortization		-407.8		-227.5
Total future amortization expense		1,939.60		1,934
Database and credit files [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	15 years
Database and credit files [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Gross		801.3		761.8
Accumulated amortization		-135.8		-84.3
Total future amortization expense		665.5		677.5
Internally developed software [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Gross		580		510.4
Accumulated amortization		-187.3		-94.7
Total future amortization expense		392.7		415.7
Customer relationships [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	20 years
Customer relationships [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Gross		392.4		336.1
Accumulated amortization		-46		-25.8
Total future amortization expense		346.4		310.3
Trademarks, copyrights and patents [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	40 years
Trademarks, copyrights and patents [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Gross		571.5		550.7
Accumulated amortization		-37.9		-22.2
Total future amortization expense		533.6		528.5
Finite-Lived Intangible Asset, Useful Life		40 years
Noncompete and other agreements [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Gross		2.2		2.5
Accumulated amortization		-0.8		-0.5
Total future amortization expense		1.4		2
TLO [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Total future amortization expense			83.1
TLO [Member] | Trademarks and Trade Names [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Total future amortization expense			13.2
Finite-Lived Intangible Asset, Useful Life			20 years
TLO [Member] | Customer relationships [Member] | TransUnion [Member] | TransUnion [Member]
Intangible assets
Total future amortization expense			$24.10
Finite-Lived Intangible Asset, Useful Life			15 years 0 months

Intangible_Assets_Details_1

Intangible Assets (Details 1) (TransUnion [Member], TransUnion [Member], USD $)	10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
TransUnion [Member] | TransUnion [Member]
Goodwill [Line Items]
Amortization of Intangible Assets	$88.30	$184.50	$142.80
Estimated future amortization expense related to purchased intangible
2015		214.3
2016		180.1
2017		146.2
2018		134
2019		115.6
Thereafter		1,149.40
Total future amortization expense		$1,939.60	$1,934

Intangible_Assets_Details_Text

Intangible Assets (Details Textual) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Intangible Assets (Textual) [Abstract]
Accumulated amortization		$407.80	$227.50
Amortization expense for intangible assets	88.3	184.5	142.8
TransUnion [Member] | TransUnion [Member] | Maximum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		40 years
TransUnion [Member] | TransUnion [Member] | Minimum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		3 years
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Intangible Assets (Textual) [Abstract]
Amortization expense for intangible assets				16.8
Database and credit files [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life					15 years
Database and credit files [Member] | TransUnion [Member] | TransUnion [Member]
Intangible Assets (Textual) [Abstract]
Accumulated amortization		135.8	84.3
Database and credit files [Member] | TransUnion [Member] | TransUnion [Member] | Maximum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		15 years
Database and credit files [Member] | TransUnion [Member] | TransUnion [Member] | Minimum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		12 years
Internally developed software [Member] | TransUnion [Member] | TransUnion [Member]
Intangible Assets (Textual) [Abstract]
Accumulated amortization		187.3	94.7
Customer relationships [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life					20 years
Customer relationships [Member] | TransUnion [Member] | TransUnion [Member]
Intangible Assets (Textual) [Abstract]
Accumulated amortization		46	25.8
Customer relationships [Member] | TransUnion [Member] | TransUnion [Member] | Maximum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		20 years
Customer relationships [Member] | TransUnion [Member] | TransUnion [Member] | Minimum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		10 years
Trademarks, copyrights and patents [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life					40 years
Trademarks, copyrights and patents [Member] | TransUnion [Member] | TransUnion [Member]
Intangible Assets (Textual) [Abstract]
Accumulated amortization		37.9	22.2
Finite-Lived Intangible Asset, Useful Life		40 years
Noncompete agreements [Member] | TransUnion [Member] | TransUnion [Member]
Intangible Assets (Textual) [Abstract]
Accumulated amortization		$0.80	$0.50
Internal Use Software [Member] | TransUnion [Member] | TransUnion [Member] | Maximum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		7 years
Internal Use Software [Member] | TransUnion [Member] | TransUnion [Member] | Minimum [Member]
Intangible Assets (Textual) [Abstract]
Finite-Lived Intangible Asset, Useful Life		3 years

Other_Assets_Details

Other Assets (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Assets Disposed of by Method Other than Sale, in Period of Disposition [Line Items]
Time Deposits, $100,000 or More, Foreign	$0.10
Other assets
Investments in affiliated companies	52.8	92.4
Deferred financing fees	25.8	29.7
Other Long-term Investments	18.8	0
Deposits	11.5	15.8
Marketable Securities, Noncurrent	10.9	9.9
Other	0.1	0.7
Total other assets	$119.90	$148.50

Investments_in_Affiliated_Comp1

Investments in Affiliated Companies (Details) (USD $)	4 Months Ended	10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Schedule of Investments [Line Items]
Earnings from equity method investments	$4.10
Dividends received from equity method investments	0.4
TransUnion [Member] | TransUnion [Member]
Schedule of Investments [Line Items]
Impairments of investments in affiliated companies					0
Equity method investments			51.9	84.5
Cost method investments			0.9	7.9
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures			52.8	92.4
Earnings from equity method investments		8	12.5	13.7
Dividends received from equity method investments		9.3	9.2	10.1
Equity Method Significant Subsidiary - TU Mexico [Member] | TransUnion [Member] | TransUnion [Member]
Schedule of Investments [Line Items]
Equity method investments			45	50
Equity Method Significant Subsidiaries [Member] | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Schedule of Investments [Line Items]
Revenue	40.9
Operating income	16.9
Income from continuing operations	14.1
Net income	14.1
Equity Method Significant Subsidiaries [Member] | TransUnion [Member] | TransUnion [Member]
Schedule of Investments [Line Items]
Current assets			57.8	83
Noncurrent assets			14.7	24.6
Current liabilities			18	26.3
Noncurrent liabilities			0.1	1.4
Revenue		82.4	124.9	132.6
Operating income		34.4	55.7	57.7
Income from continuing operations		28.6	43.9	48.2
Net income		28.6	43.9	48.2
Equity Method Significant Subsidiary - CIBIL [Member] | TransUnion [Member] | TransUnion [Member]
Schedule of Investments [Line Items]
Equity method investments			0	28.4
Equity Method - All Other Subsidiaries [Member] | TransUnion [Member] | TransUnion [Member]
Schedule of Investments [Line Items]
Equity method investments			$6.90	$6.10

Investments_in_Affiliated_Comp2

Investments in Affiliated Companies (Details Textual) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012	Jun. 30, 2014	21-May-14
TransUnion Intermediate-Predecessor
Ownership interest				100.00%
TransUnion [Member] | TransUnion [Member]
Earnings from equity method investments	$8	$12.50	$13.70
Percentage of ownership interest		20.00%
Maximum Ownership Percent Consider Under Cost Method Investments		20.00%
Cost-method Investments, Realized Gain (Loss)	0	-4.1	0
Other-than-temporary impairments of marketable securities			0
TransUnion [Member] | Cost-method Investments [Member] | TransUnion [Member]
Cost-method Investments, Realized Gain (Loss)		4.1
Dividends received from cost method investments	0.6	0.8	0.7
TransUnion [Member] | Equity Method Significant Subsidiary - CIBIL [Member] | TransUnion [Member]
Equity Method Investment, Ownership Percentage			27.50%
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Earnings from equity method investments				4.1
Cost-method Investments, Realized Gain (Loss)				0
Transunion Intermediate [Member] | Cost-method Investments [Member] | TransUnion Intermediate-Predecessor
Dividends received from cost method investments				0
CIBIL [Member] | TransUnion [Member] | TransUnion [Member]
Noncontrolling Interest, Ownership Percentage by Parent						55.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain					$0

Other_Current_Liabilities_Deta

Other Current Liabilities (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Other current liabilities
Accrued payroll	$71.50	$63.70
Accrued interest	20.5	23.1
Estimated litigation liability, current	17.8	13.8
Deferred revenue	8.6	9.1
Accrued employee benefits	13	9.6
Other	18	14.2
Total other current liabilities	$149.40	$133.50

Other_Liabilities_Details

Other Liabilities (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Other liabilities
Retirement benefits	$10.80	$10.40
Unrecognized tax benefits	0.3	4.6
Other	11	7.6
Total other liabilities	$22.10	$22.60

Debt_Details

Debt (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Debt and capital lease obligations	$2,939.90	$2,866.90
Current portion of long-term debt	-74	-13.8
Debt outstanding
Long-term debt	2,865.90	2,853.10
Total debt	2,939.90
Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	1,881.50	1,123.50
Senior Secured Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	50	0
11.375% Senior notes [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	0	740.9
9.625% Senior Note [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	600	600
8.125 % Senior Note [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	398.7	398.3
Debt outstanding
Total debt	398.7
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	7.4	0
Capital lease obligations [Member]
Debt Instrument [Line Items]
Debt and capital lease obligations	$2.30	$4.20

Debt_Details_1

Debt (Details 1) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Scheduled future maturities
2014	$74
2015	23.4
2016	19.4
2017	1,019
2018	19
Thereafter	1,790.70
Unamortized premiums and discounts on notes	-5.6
Total debt	$2,939.90

Debt_Details_3

Debt (Details 3) (TransUnion Intermediate-Predecessor, Transunion Intermediate [Member], USD $)	4 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Loan fees included in other interest and expense
Loss on early extinguishment of debt	$0

Debt_Details_Textual

Debt (Details Textual) (TransUnion [Member], TransUnion [Member], USD $)	3 Months Ended	10 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Mar. 21, 2012	Nov. 01, 2012	Apr. 09, 2014	Mar. 31, 2014	9-May-14	Apr. 30, 2012	Apr. 15, 2013
Debt (Textual) [Abstract]
Repayment of term loan		$17,200,000	$25,600,000	$11,900,000
Proceeds from Unsecured Lines of Credit	50,000,000
Carrying value of long term debts	2,939,900,000		2,939,900,000
Gains (Losses) on Extinguishment of Debt		0	33,100,000	0
Debt issuance costs expensed			12,700,000
Accumulated other comprehensive income (loss)	-117,500,000	-24,400,000	-117,500,000	-73,200,000
Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			9-Apr-21
Debt (Textual) [Abstract]
Variable interest rate	4.00%		4.00%
Debt Instrument, unamortized premium	4,300,000		4,300,000	-200,000
Senior Loans [Member]
Debt (Textual) [Abstract]
Senior notes issued notes to investor							1,900,000,000	1,120,500,000
Principal payments percentage			0.25%
LIBOR Floor Rate	1.00%		1.00%
Senior Loans [Member] | Minimum [Member]
Debt (Textual) [Abstract]
Revolving line of credit rate margin			2.75%
Percentage of excess cash flows to determine principal payment			0.00%
Senior Loans [Member] | Maximum [Member]
Debt (Textual) [Abstract]
Revolving line of credit rate margin			3.00%
Percentage of excess cash flows to determine principal payment			50.00%
Senior Secured Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			9-Apr-19
Debt (Textual) [Abstract]
Variable interest rate	3.75%		3.75%
Senior secured revolving line of credit							190,000,000	210,000,000
LIBOR Floor Rate	1.00%		1.00%
Senior Secured Revolving Line Of Credit [Member] | Minimum [Member]
Debt (Textual) [Abstract]
Revolving line of credit rate margin			2.50%
Annual commitment fee			0.38%
Senior Secured Revolving Line Of Credit [Member] | Maximum [Member]
Debt (Textual) [Abstract]
Revolving line of credit rate margin			2.75%
Annual commitment fee			0.50%
11.375% Senior notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			15-Jun-18
Debt Instrument, Interest Rate, Stated Percentage	11.38%		11.38%
Debt (Textual) [Abstract]
Fixed interest rate	11.38%		11.38%
Unamortized fair value adjustment	0		0	95,900,000
Senior notes issued notes to investor	645,000,000		645,000,000						645,000,000
Gains (Losses) on Extinguishment of Debt			45,800,000
Gain (loss) on debt extinguishment - write-off of fair value adjustment			89,400,000
Gain (loss) on debt extinguishment - other costs			-43,600,000
9.625%/10.375% senior PIK toggle notes due 2018 [Member]
Debt (Textual) [Abstract]
Carrying value of long term debts	600,000,000		600,000,000
9.625% Senior Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			15-Jun-18
Debt Instrument, Interest Rate, Stated Percentage	9.63%		9.63%
Debt (Textual) [Abstract]
Fixed interest rate	9.63%		9.63%		9.63%					9.63%
PIK rate percentage on notes	10.38%		10.38%		10.38%
Senior Note Maturity Date			15-Jun-18		15-Jun-18
Senior notes issued notes to investor	600,000,000		600,000,000		600,000,000
Long term debt fair value	613,700,000		613,700,000
8.125 % Senior Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			15-Jun-18
Debt Instrument, Interest Rate, Stated Percentage	8.13%		8.13%
Debt Instrument, Unamortized Discount	1,300,000		1,300,000	1,700,000
Debt (Textual) [Abstract]
Fixed interest rate	8.13%		8.13%
PIK rate percentage on notes	8.88%		8.88%
Senior notes issued notes to investor	400,000,000		400,000,000
Offering price						99.50%
Carrying value of long term debts	398,700,000		398,700,000
Long term debt fair value	410,200,000		410,200,000
10.0% Note payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			15-Apr-13
Debt Instrument, Interest Rate, Stated Percentage
Debt (Textual) [Abstract]
Unsecured, non-interest bearing note, due in annual installments
Senior Unsecured PIK Toggle Notes Nine Point Six Two Five [Member]
Debt (Textual) [Abstract]
Fixed interest rate	9.63%		9.63%
Swap [Member]
Debt (Textual) [Abstract]
Percentage variable rate of interest	1.50%		1.50%
Fixed rate of interest	2.03%		2.03%
Debt Instrument, Description of Variable Rate Basis			three-month LIBOR
Derivative Liability, Fair Value, Gross Liability							1,600,000
Accumulated other comprehensive income (loss)							1,000,000
Loss on Derivative Instruments, Pretax			$300,000

Earnings_per_share_Details

Earnings per share (Details) (USD $)	3 Months Ended								10 Months Ended	12 Months Ended			4 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive stock outstanding										7.7	7.1	6.5
Earnings available to common shareholders	($13.10)	($2.60)	$17.90	($14.70)	($17.60)	($3.40)	($7.80)	($6.30)	($8.80)	($12.50)	($35.10)
Weighted average shares outstanding									109.7	110.5	109.9
Earnings per share - basic	($0.12)	($0.02)	$0.16	($0.13)	($0.16)	($0.03)	($0.07)	($0.06)	($0.08)	($0.11)	($0.32)
Earnings available to common shareholders									-8.8	-12.5	-35.1
Dilutive impact of stock based awards									0	0	0
Weighted average dilutive shares outstanding									109.7	110.5	109.9
Earnings per share - diluted	($0.12)	($0.02)	$0.16	($0.13)	($0.16)	($0.03)	($0.07)	($0.06)	($0.08)	($0.11)	($0.32)
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Earnings available to common shareholders													-54.9
Weighted average shares outstanding													29.8
Earnings per share - basic													($1.84)
Earnings available to common shareholders													($54.90)
Dilutive impact of stock based awards													0
Weighted average dilutive shares outstanding													29.8
Earnings per share - diluted													($1.84)

Income_Taxes_Details

Income Taxes (Details) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Federal
Current	$0.10	($0.10)	$0.10
Deferred	-3	-15.9	-15.5
State
Current	-0.5	0.4	0
Deferred	-0.3	0.1	-0.3
Foreign
Current	12.1	23.1	18.4
Deferred	-1.8	-5	-0.4
Total provision (benefit) for income taxes	6.6	2.6	2.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Federal
Current				1
Deferred				-16.1
State
Current				0.1
Deferred				-1.5
Foreign
Current				5.7
Deferred				-0.7
Total provision (benefit) for income taxes				($11.50)

Income_Taxes_Details_1

Income Taxes (Details 1) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Summary of components of income (loss) from continuing operations before income taxes
Domestic	($33.30)	($54.10)	($72.90)
Foreign	36	52.3	47
Total income (loss) from continuing operations before income taxes	2.7	-1.8	-25.9
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Summary of components of income (loss) from continuing operations before income taxes
Domestic				-79.5
Foreign				15.6
Total income (loss) from continuing operations before income taxes				($63.90)

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Reconciliation of the U.S. federal statutory tax rate to our effective tax rate
Income taxes at 35% statutory rate, Value	$0.90	($0.60)	($9.10)
Income taxes at 35% statutory rate, Percent	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
State taxes net of federal income tax benefit	-0.9	0.4	-0.1
State taxes net of federal income tax benefit, percent	-35.00%	-23.90%	0.40%
Foreign rate differential	-4	-1.8	-0.9
Foreign rate differential, percent	-148.10%	98.70%	3.50%
Nondeductible change in control transaction expenses	1.8	0	0
Nondeductible change in control transaction expenses, percent	66.70%	0.00%	0.00%
Application of ASC 740-30 to foreign earnings	4.3	5.6	15.1
Application of ASC 740-30 to foreign earnings, percent	159.20%	-308.40%	-58.00%
Impact of foreign dividends and foreign tax credits	5	0	-1.7
Impact of foreign dividends and foreign tax credits, percent	185.20%	-1.60%	6.40%
Other	-0.5	-1	-1
Other, percent	-18.60%	56.00%	3.90%
Total provision (benefit) for income taxes	6.6	2.6	2.3
Total, percent	244.40%	-144.20%	-8.80%
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Reconciliation of the U.S. federal statutory tax rate to our effective tax rate
Income taxes at 35% statutory rate, Value				-22.4
Income taxes at 35% statutory rate, Percent				35.00%
Increase (decrease) resulting from:
State taxes net of federal income tax benefit				-1.4
State taxes net of federal income tax benefit, percent				2.20%
Foreign rate differential				-1.2
Foreign rate differential, percent				1.90%
Nondeductible change in control transaction expenses				2.7
Nondeductible change in control transaction expenses, percent				-4.20%
Application of ASC 740-30 to foreign earnings				8.1
Application of ASC 740-30 to foreign earnings, percent				-12.70%
Impact of foreign dividends and foreign tax credits				2
Impact of foreign dividends and foreign tax credits, percent				-3.10%
Other				0.7
Other, percent				-1.10%
Total provision (benefit) for income taxes				($11.50)
Total, percent				18.00%

Income_Taxes_Details_3

Income Taxes (Details 3) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Deferred income tax assets:
Deferred compensation	$9.80	$6.80
Employee benefits	7.8	6.3
Legal reserves and settlements	5.3	3.5
Hedge investments	0.7	0.4
Financing related costs	3.6	39.4
Loss and credit carryforwards	110.7	72.5
Other	8.6	8.6
Gross deferred income tax assets	146.5	137.5
Valuation allowance	-42.1	-25.9
Total deferred income tax assets, net	104.4	111.6
Deferred income tax liabilities:
Depreciation and amortization	-663.3	-647.3
Investments in affiliated companies	-15	-17.1
Taxes on undistributed foreign earnings	-50.4	-57.1
Other	-1.3	-4.9
Total deferred income tax liability	-730	-726.4
Net deferred income tax liability	($625.60)	($614.80)

Income_Taxes_Details_4

Income Taxes (Details 4) (TransUnion [Member], TransUnion [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
TransUnion [Member] | TransUnion [Member]
Unrecognized tax benefits
Balance as of beginning of period	$4.60	$4.90
Reductions for tax positions of prior years	0	-0.1
Reductions relating to settlement and lapse of statute	-2.7	-0.2
Balance as of December 31	$1.90	$4.60

Income_Taxes_Details_Textual

Income Taxes (Details Textual) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member]
Income Taxes (Additional Textual) [Abstract]
Undistributed earnings of foreign subsidiaries, not expected to be remitted		$141.70
Undistributed earnings of foreign subsidiaries, expected to be remitted		118.7
TransUnion [Member] | TransUnion [Member]
Income Taxes (Textual) [Abstract]
Total unrecognized tax benefits	4.9	1.9	4.6
Unrecognized tax benefits that would impact effective tax rate		0.3	4.6
Effective tax rate	244.40%	-144.20%	-8.80%
U.S. federal statutory rate	35.00%	35.00%	35.00%
Deferred tax liabilities, undistributed foreign earnings		50.4	57.1
Operating loss carry forward expiration period		20 years
Income Taxes (Additional Textual) [Abstract]
Valuation allowance increased		16.2
Valuation allowance		42.1	25.9
Foreign loss and credit carryforwards will expire		10 years
Accrued interest payable for taxes		0.9	0.7
Significant expense recognized, or significant liability recorded, for tax penalties		$0	$0
Capital loss carryforward expiration period		5 years
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Income Taxes (Textual) [Abstract]
Effective tax rate				18.00%
U.S. federal statutory rate				35.00%

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$3	$10.60	$6.90
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1.1	3.8	2.5
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense				90
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense				32.4
Equity Option [Member] | TransUnion [Member] | TransUnion [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		7,684,447	7,106,389
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price		$8.83	$7.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		8 years 2 months	8 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		65.8	28.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		7,022,716
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$8.83
Stock option activity consisted of the following:
Beginning, aggregate intrinsic value	0	1.1	0.5
Shares, granted		1,461,865
Weighted average exercise price, granted		$14.76
Shares, exercised		-164,484
Weighted average exercise price, exercised		$6.65
Shares, forfeited		-717,973
Weighted average exercise price, forfeited		$8.64
Shares, expired		-1,350
Weighted average exercise price, expired		$6.65
Ending, aggregate intrinsic value	0	1.1	0.5
Shares, exercisable vested and expected to vest		995,418
Exercisable vested and expected to vest, weighted average exercise price		$7.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		7 years 11 months
Exercisable vested and expected to vest, weighted average remaining contractual term		8 years 2 months
Equity Option [Member] | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Stock option activity consisted of the following:
Beginning, aggregate intrinsic value				0
Ending, aggregate intrinsic value				$0
Equity Option [Member] | Service Condition Option [Member] | TransUnion [Member] | TransUnion [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate	0.00%	0.00%	0.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate	59.00%
Stock option activity consisted of the following:
Risk-free rate of return	0.90%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term	6 years 2 months
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value	$4.97	$8.16	$5.61
Equity Option [Member] | Service Condition Option [Member] | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate				0.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate				30.00%
Stock option activity consisted of the following:
Risk-free rate of return				2.40%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term				6 years 6 months
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value				$15.74
Equity Option [Member] | Market Condition Option [Member] | TransUnion [Member] | TransUnion [Member]
Stock option activity consisted of the following:
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value	$4.08	$7.45	$5.19
Equity Option [Member] | Market Condition Option [Member] | TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Stock option activity consisted of the following:
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value				$15.15

Stock_Based_Compensation_Detai

Stock Based Compensation (Details 1) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$3	$10.60	$6.90
TransUnion [Member] | TransUnion [Member] | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		8 years 2 months	8 years 9 months
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$6.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		7,684,447	7,106,389
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price		$8.83	$7.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		65.8	28.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		717,973
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price		$8.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period		1,350
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price		$6.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		7,022,716
Intrinsic value of stock options exercised	0	1.1	0.5
Share-based compensation arrangement by share-based payment award, options, grants in period, gross		1,461,865
Total fair value of options vested	0	3	3.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		995,418
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price		$7.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		7 years 11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$8.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term		8 years 2 months
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$14.76
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense				90
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised				0
Total fair value of options vested				$18.20
Service Condition Option [Member] | TransUnion [Member] | TransUnion [Member] | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate	59.00%
Risk-free rate of return	0.90%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term	6 years 2 months
Service Condition Option [Member] | Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate				30.00%
Risk-free rate of return				2.40%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term				6 years 6 months
Minimum [Member] | Service Condition Option [Member] | TransUnion [Member] | TransUnion [Member] | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate		55.00%	60.00%
Risk-free rate of return		0.90%	0.90%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term		5 years 11 months	5 years 11 months
Maximum [Member] | Service Condition Option [Member] | TransUnion [Member] | TransUnion [Member] | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate		60.00%	70.00%
Risk-free rate of return		2.30%	1.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term		6 years 5 months	6 years 1 month

Stock_Based_Compensation_Detai1

Stock Based Compensation (Details Textual) (USD $)	10 Months Ended	12 Months Ended			4 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2012	Nov. 01, 2012	Nov. 09, 2012
TransUnion [Member] | TransUnion [Member]
Stock Based Compensation (Textual) [Abstract]
Stock-based compensation expense	$3	$10.60	$6.90
Income tax benefit	1.1	3.8	2.5
Additional stock-based compensation expense				2.8
Shares authorized for grant		9,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		400,000
Special dividend paid						$3.41
Stock-based compensation expense remaining to be recognized with a weighted-average recognition period for market condition options		1 year
Employee service share-based compensation, tax benefit realized from exercise of stock options		0.1
Vesting period for restricted stock granted				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		10.2
TransUnion [Member] | TransUnion [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award, net of forfeitures				25,082
Stock Based Compensation (Textual) [Abstract]
Special dividend paid						$3.41
Exercise price of Stock option and SARs							$10.07
Exercise price of Stock option and SARs after modification							$6.65
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options		0.1
TransUnion [Member] | TransUnion [Member] | Stock Appreciation Rights [Member]
Stock Based Compensation (Textual) [Abstract]
Term of Stock option and SARs		10 years
Exercise price of Stock option and SARs							$10.07
Exercise price of Stock option and SARs after modification							$6.65
Stock-based compensation expense remaining to be recognized in future years for service condition options		3.9
Shares, granted	900,000	100,000	100,000
Share-based compensation, shares authorized under stock option plans, exercise price range, outstanding options, weighted average exercise price	$6.65	$14.58	$9.52	$6.65
Total fair value of restricted stock vested		100,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, forfeited in period		200,000
Stock issued during period, shares, share-based compensation, gross		100,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, share-based liabilities paid		0.1
TransUnion [Member] | TransUnion [Member] | Stock Appreciation Rights [Member] | Service Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Percentage of stock options and stock appreciation rights vest granted based on service condition award		40.00%
Vesting period for restricted stock granted		5 years
TransUnion [Member] | TransUnion [Member] | Stock Appreciation Rights [Member] | Market Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Percentage of stock options and stock appreciation rights vest granted based on market condition award		60.00%
Vesting period for restricted stock granted		5 years
TransUnion [Member] | TransUnion [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		8 years 2 months	8 years 9 months
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price		$6.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value		60.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		7,684,447	7,106,389
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price		$8.83	$7.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		65.8	28.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		717,973
Stock Based Compensation (Textual) [Abstract]
Term of Stock option and SARs		10 years
Exercise price of Stock option and SARs							$10.07
Exercise price of Stock option and SARs after modification							$6.65
Service condition awards vesting percentage on either the first anniversary or one year after the grant date		20.00%
One year after the grant date control transaction		5.00%
Stock options exercised		164,484
Intrinsic value of stock options exercised	0	1.1	0.5
Shares, granted		1,461,865
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$14.76
Employee service share-based compensation, cash received from exercise of stock options		1.1
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$6.65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	0	3	3.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		995,418
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price		$7.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		7 years 11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		7,022,716
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$8.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term		8 years 2 months
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price		$8.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period		1,350
TransUnion [Member] | TransUnion [Member] | Stock Option [Member] | Service Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Percentage of stock options and stock appreciation rights vest granted based on service condition award		40.00%
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value	$4.97	$8.16	$5.61
Expected volatility	59.00%
Risk-free rate of return	0.90%
Stock-based compensation expense remaining to be recognized in future years for service condition options		11.3
Stock-based compensation expense remaining to be recognized with a weighted-average recognition period for service condition options		3 years 6 months
Vesting period for restricted stock granted		5 years
TransUnion [Member] | TransUnion [Member] | Stock Option [Member] | Market Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Percentage of stock options and stock appreciation rights vest granted based on market condition award		60.00%
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value	$4.08	$7.45	$5.19
Stock-based compensation expense remaining to be recognized in future years for service condition options		15.5
Stock-based compensation expense remaining to be recognized with a weighted-average recognition period for market condition options		2 years 8 months
TransUnion [Member] | TransUnion [Member] | Maximum [Member] | Stock Option [Member] | Service Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Expected volatility		60.00%	70.00%
Risk-free rate of return		2.30%	1.00%
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Stock Based Compensation (Textual) [Abstract]
Stock-based compensation expense					90
Income tax benefit					32.4
Additional stock-based compensation expense					88
Additional stock based compensation net of tax recognized in connection with current year change in control transaction					31.7
Existing option holders received in cash consideration for the value of their options				91.2
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member] | Stock Option [Member]
Stock Based Compensation (Textual) [Abstract]
Intrinsic value of stock options exercised					0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					$18.20
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member] | Stock Option [Member] | Service Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value					$15.74
Expected volatility					30.00%
Risk-free rate of return					2.40%
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member] | Stock Option [Member] | Market Condition Option [Member]
Stock Based Compensation (Textual) [Abstract]
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value					$15.15

Fair_Value_Details

Fair Value (Details) (TransUnion [Member], TransUnion [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Financial instruments measured at fair value, on a recurring basis
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$19.50
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	1.5
Fair Value, Recurring [Member]
Financial instruments measured at fair value, on a recurring basis
Trading securities	10.9
Available-for-sale Securities, Noncurrent	3
Assets, Fair Value Disclosure	13.9
Financial and Nonfinancial Liabilities, Fair Value Disclosure	-7
Business Combination, Contingent Consideration, Liability	-5
Derivative Liability, Fair Value, Gross Liability	-2
Level 1 [Member] | Fair Value, Recurring [Member]
Financial instruments measured at fair value, on a recurring basis
Trading securities	6.6
Available-for-sale Securities, Noncurrent	0
Assets, Fair Value Disclosure	6.6
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Business Combination, Contingent Consideration, Liability	0
Derivative Liability, Fair Value, Gross Liability	0
Level 2 [Member] | Fair Value, Recurring [Member]
Financial instruments measured at fair value, on a recurring basis
Trading securities	4.3
Available-for-sale Securities, Noncurrent	3
Assets, Fair Value Disclosure	7.3
Financial and Nonfinancial Liabilities, Fair Value Disclosure	-2
Business Combination, Contingent Consideration, Liability	0
Derivative Liability, Fair Value, Gross Liability	-2
Level 3 [Member] | Fair Value, Recurring [Member]
Financial instruments measured at fair value, on a recurring basis
Trading securities	0
Available-for-sale Securities, Noncurrent	0
Assets, Fair Value Disclosure	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	-5
Business Combination, Contingent Consideration, Liability	-5
Derivative Liability, Fair Value, Gross Liability	$0
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, Date	17-Jan-33
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, Date	17-Dec-27

Operating_Segments_Details

Operating Segments (Details) (USD $)	4 Months Ended	3 Months Ended								10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Financial information by segments
Revenue	$373
Operating income (loss)	-0.2
Non-operating income and expense	-63.7
Income (loss) before income taxes	-63.9
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | U.S. Information Services [Member]
Financial information by segments
Revenue	238.1
Operating income (loss)	33.2
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | International [Member]
Financial information by segments
Revenue	76.6
Operating income (loss)	5.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Interactive [Member]
Financial information by segments
Revenue	58.3
Operating income (loss)	13
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Corporate [Member]
Financial information by segments
Operating income (loss)	-51.7
TransUnion [Member] | TransUnion [Member]
Financial information by segments
Revenue										767	1,304.70	1,183.20
Operating income (loss)		20.4	40.8	32.4	34.8	36.2	49.3	39.5	44.2	141.2	128.4	169.2
Non-operating income and expense										-138.5	-130.2	-195.1
Income (loss) before income taxes										2.7	-1.8	-25.9
TransUnion [Member] | TransUnion [Member] | U.S. Information Services [Member]
Financial information by segments
Revenue										487.4	818.6	740.6
Operating income (loss)										121.9	112.8	154.7
TransUnion [Member] | TransUnion [Member] | International [Member]
Financial information by segments
Revenue										157.8	255.5	238.9
Operating income (loss)										19.1	22.2	19.5
TransUnion [Member] | TransUnion [Member] | Interactive [Member]
Financial information by segments
Revenue										121.8	230.6	203.7
Operating income (loss)										48.7	85.5	65.6
TransUnion [Member] | TransUnion [Member] | Corporate [Member]
Financial information by segments
Operating income (loss)										($48.50)	($92.10)	($70.60)

Operating_Segments_Details_2

Operating Segments (Details 2) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments	$8	$12.50	$13.70
TransUnion [Member] | U.S. Information Services [Member] | TransUnion [Member]
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments	0.9	1.2	1.4
TransUnion [Member] | International [Member] | TransUnion [Member]
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments	7.1	11.3	12.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments				4.1
Transunion Intermediate [Member] | U.S. Information Services [Member] | TransUnion Intermediate-Predecessor
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments				0.5
Transunion Intermediate [Member] | International [Member] | TransUnion Intermediate-Predecessor
Other income and expense, net, included earnings (losses) from equity method investments
Other income and expense, net from equity method investments				$3.60

Operating_Segments_Details_3

Operating Segments (Details 3) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Property, plant and equipment, net of accumulated depreciation and amortization, by segment
Assets	$4,665.80	$4,492.30
U.S. Information Services [Member]
Property, plant and equipment, net of accumulated depreciation and amortization, by segment
Assets	2,932.80	2,894.70
International [Member]
Property, plant and equipment, net of accumulated depreciation and amortization, by segment
Assets	1,268.10	1,166.80
Interactive [Member]
Property, plant and equipment, net of accumulated depreciation and amortization, by segment
Assets	268.8	268.3
Corporate [Member]
Property, plant and equipment, net of accumulated depreciation and amortization, by segment
Assets	$196.10	$162.50

Operating_Segments_Details_4

Operating Segments (Details 4) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment	$48.80	$155.20	$81.70
TransUnion [Member] | TransUnion [Member] | U.S. Information Services [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment	30.8	99.6	46.9
TransUnion [Member] | TransUnion [Member] | International [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment	8.6	30.1	17.1
TransUnion [Member] | TransUnion [Member] | Interactive [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment	2.8	5.3	3.9
TransUnion [Member] | TransUnion [Member] | Corporate [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment	6.6	20.2	13.8
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment				20.4
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | U.S. Information Services [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment				14.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | International [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment				2.4
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Interactive [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment				1.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Corporate [Member]
Cash paid for capital expenditures, by segment
Payments to acquire property, plant, and equipment				$2.40

Operating_Segments_Details_5

Operating Segments (Details 5) (USD $)	4 Months Ended	10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment	$29.20
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | U.S. Information Services [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment	22.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | International [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment	3.7
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Interactive [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment	1.3
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor | Corporate [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment	1.9
TransUnion [Member] | TransUnion [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment		115	241.2	186.8
TransUnion [Member] | TransUnion [Member] | U.S. Information Services [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment		78.9	174.3	129.3
TransUnion [Member] | TransUnion [Member] | International [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment		25.8	51	39.9
TransUnion [Member] | TransUnion [Member] | Interactive [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment		5.2	10.3	8.9
TransUnion [Member] | TransUnion [Member] | Corporate [Member]
Depreciation and amortization expense of continuing operations, by segment
Depreciation and amortization expense of continuing operations, by segment		$5.10	$5.60	$8.70

Operating_Segments_Details_6

Operating Segments (Details 6)	10 Months Ended	12 Months Ended		4 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | United States [Member] | TransUnion [Member]
Revenue based on the country
Revenue earned	79.00%	80.00%	80.00%
TransUnion [Member] | South Africa [Member] | TransUnion [Member]
Revenue based on the country
Revenue earned	7.00%	6.00%	6.00%
TransUnion [Member] | Canada [Member] | TransUnion [Member]
Revenue based on the country
Revenue earned	5.00%	5.00%	5.00%
TransUnion [Member] | Other Country [Member] | TransUnion [Member]
Revenue based on the country
Revenue earned	9.00%	9.00%	9.00%
Transunion Intermediate [Member] | United States [Member] | TransUnion Intermediate-Predecessor
Revenue based on the country
Revenue earned				79.00%
Transunion Intermediate [Member] | South Africa [Member] | TransUnion Intermediate-Predecessor
Revenue based on the country
Revenue earned				8.00%
Transunion Intermediate [Member] | Canada [Member] | TransUnion Intermediate-Predecessor
Revenue based on the country
Revenue earned				6.00%
Transunion Intermediate [Member] | Other Country [Member] | TransUnion Intermediate-Predecessor
Revenue based on the country
Revenue earned				7.00%

Operating_Segments_Details_7

Operating Segments (Details 7) (TransUnion [Member], TransUnion [Member])	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United States [Member]
Long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset
Long-lived assets, other than financial instruments and deferred tax assets	82.00%	85.00%	81.00%
South Africa [Member]
Long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset
Long-lived assets, other than financial instruments and deferred tax assets	3.00%	3.00%	5.00%
Canada [Member]
Long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset
Long-lived assets, other than financial instruments and deferred tax assets	3.00%	3.00%	4.00%
Other Country [Member]
Long-lived assets, other than financial instruments and deferred tax assets, based on the location of the legal entity that owns the asset
Long-lived assets, other than financial instruments and deferred tax assets	12.00%	9.00%	10.00%

Operating_Segments_Details_Tex

Operating Segments (Details Textual) (TransUnion [Member], TransUnion [Member])	12 Months Ended
	Dec. 31, 2014
	Segment
TransUnion [Member] | TransUnion [Member]
Operating Segments (Textual) [Abstract]
Number of operating segments	3

Commitments_Details

Commitments (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Summary of future minimum payments for noncancelable operating leases, purchase obligations and other liabilities
Operating Leases, 2015	$12.80
Operating Leases, 2016	9.9
Operating Leases, 2017	7
Operating Leases, 2018	5.4
Operating Leases, 2019	5
Operating Leases, Thereafter	11.8
Totals, Operating Leases	51.9
Purchase Obligations, 2015	182
Purchase Obligations, 2016	31.9
Purchase Obligations, 2017	11.1
Purchase Obligations, 2018	6.7
Purchase Obligations, 2019	1.1
Purchase Obligations, Thereafter	2.5
Totals, Purchase Obligations	235.3
Total, 2014	194.8
Total, 2015	41.8
Total, 2016	18.1
Total, 2017	12.1
Total, 2018	6.1
Total, Thereafter	14.3
Totals	$287.20

Commitments_Details_Textual

Commitments (Details Textual) (USD $)	10 Months Ended	12 Months Ended		4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2012
TransUnion [Member] | TransUnion [Member]
Commitments (Textual) [Abstract]
Rental expense	$7.40	$13.40	$11
Operating lease other than of TransUnion Corp		51.9
Commitments (Additional Textual) [Abstract]
Trade accounts payable		106.5	100.3
Minimum payment under licensing agreements		0
TransUnion Intermediate-Predecessor | Transunion Intermediate [Member]
Commitments (Textual) [Abstract]
Rental expense				$3.70

Contingencies_Details

Contingencies (Details) (TransUnion [Member], TransUnion [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
TransUnion [Member] | TransUnion [Member]
Contingencies (Textual) [Abstract]
Anticipated claims of continuing operations related to TransUnion Corp	$17.80	$13.80

RelatedParty_Transactions_Deta

Related-Party Transactions (Details) (USD $)	12 Months Ended	4 Months Ended	10 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Related Party Transactions (Textual) [Abstract]
Acquisition costs	$36.50
Neal Gerber and Eisenberg LLP [Member] | TransUnion Intermediate-Predecessor
Related Party Transactions (Textual) [Abstract]
Legal services		0.1
Pritzker Family US Situs Trusts [Member]
Related Party Transactions (Textual) [Abstract]
Beneficially owned excess		5.00%
Affiliates of Goldman Sachs & Co [Member] | TransUnion Intermediate-Predecessor
Related Party Transactions (Textual) [Abstract]
Acquisition costs	1.4
Pritzker family business interests [Member]
Related Party Transactions (Textual) [Abstract]
Beneficially owned excess		5.00%
TransUnion [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Advisory fee				0.3
Annual increase in advisor fee to GSC & Advent				5.00%
Acquisition costs			15.6	0.5	3.7
Common stock, shares issued				111,400,000	110,700,000
TransUnion [Member] | Neal Gerber and Eisenberg LLP [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Legal services			0.5
TransUnion [Member] | Latham and Watkins LLP [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Legal services			0.4
TransUnion [Member] | Advent International Corporation [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Related party transaction, expenses from transactions with related party			0.1	0.3	0.3
Acquisition costs	0.2
TransUnion [Member] | Goldman Sachs and Company [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Related party transaction, expenses from transactions with related party			0.1	0.3	0.3
TransUnion [Member] | Director [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Advisory fee				0.2
TransUnion [Member] | Affiliates of Goldman Sachs & Co [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Acquisition costs	11.9
TransUnion [Member] | Pritzker family business interests [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Other liabilities				3.2	3.2
TransUnion [Member] | Executive Officer [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Common stock, shares issued	424,800		424,800	257,576
Purchase price of common shares	$6.65		$6.65	$17.40
TransUnion [Member] | Former Executive Officers [Member] | Successor [Member]
Related Party Transactions (Textual) [Abstract]
Aggregate purchase of common stock	69,625
Purchase price of aggregate common stock	$10.07		$10.07
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Related Party Transactions (Textual) [Abstract]
Acquisition costs		20.9
Transunion Intermediate [Member] | Latham and Watkins LLP [Member] | TransUnion Intermediate-Predecessor
Related Party Transactions (Textual) [Abstract]
Legal services		$3.50
$6.65 purchase price [Member] | TransUnion [Member] | Executive Officer [Member]
Related Party Transactions (Textual) [Abstract]
Common stock, shares issued					26,326
Purchase price of common shares					$6.65
$6.65 purchase price [Member] | TransUnion [Member] | Former Executive Officers [Member]
Related Party Transactions (Textual) [Abstract]
Aggregate purchase of common stock					297,955
Purchase price of aggregate common stock					$6.65
$11.42 purchase price [Member] | TransUnion [Member] | Executive Officer [Member]
Related Party Transactions (Textual) [Abstract]
Common stock, shares issued					87,566
Purchase price of common shares					$11.42
$11.42 purchase price [Member] | TransUnion [Member] | Former Executive Officers [Member]
Related Party Transactions (Textual) [Abstract]
Aggregate purchase of common stock					109,623
Purchase price of aggregate common stock					$11.42

Quarterly_Financial_Data_Unaud2

Quarterly Financial Data (Unaudited) (Details) (TransUnion [Member], TransUnion [Member], USD $)	3 Months Ended								10 Months Ended	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
TransUnion [Member] | TransUnion [Member]
Summary of quarterly financial data
Revenue	$335.60	$338.20	$327.50	$303.40	$292.40	$299.50	$300.80	$290.50
Operating income (loss)	20.4	40.8	32.4	34.8	36.2	49.3	39.5	44.2	141.2	128.4	169.2
Net loss	-10.7	-0.1	19.9	-13.5	-15.7	-1.4	-6.1	-5	-3.9	-4.4	-28.2
Net income (loss) attributable to TransUnion Corp.	($13.10)	($2.60)	$17.90	($14.70)	($17.60)	($3.40)	($7.80)	($6.30)	($8.80)	($12.50)	($35.10)
Earnings per share - basic	($0.12)	($0.02)	$0.16	($0.13)	($0.16)	($0.03)	($0.07)	($0.06)	($0.08)	($0.11)	($0.32)
Earnings per share - diluted	($0.12)	($0.02)	$0.16	($0.13)	($0.16)	($0.03)	($0.07)	($0.06)	($0.08)	($0.11)	($0.32)

Quarterly_Financial_Data_Unaud3

Quarterly Financial Data (Unaudited) (Details 1) (Transunion Intermediate [Member], TransUnion Intermediate-Predecessor, USD $)	4 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Summary of quarterly financial data
Operating income (loss)	($0.20)
Net loss	-52.4
Net income (loss) attributable to TransUnion Corp.	($54.90)

Quarterly_Financial_Data_Unaud4

Quarterly Financial Data (Unaudited) (Details Textual) (USD $)	12 Months Ended	4 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Apr. 30, 2012
Quarterly Financial Data (Textual) [Abstract]
Acquisition fees	$36.50
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Quarterly Financial Data (Textual) [Abstract]
Acquisition fees		$20.90

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	4 Months Ended	8 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total	($1.40)				($3.60)
Change	2.2
Accumulated other comprehensive income (loss), total	-1.4				-3.6
Transunion Intermediate [Member] | Foreign Currency Translation Adjustment | TransUnion Intermediate-Predecessor
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total	-1.4				-3.6
Change	2.2
Accumulated other comprehensive income (loss), total	-1.4				-3.6
Transunion Intermediate [Member] | Net Unrealized Gain/(Loss) On Hedges | TransUnion Intermediate-Predecessor
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total	0				0
Change	0
Accumulated other comprehensive income (loss), total	0				0
Transunion Intermediate [Member] | Net Unrealized Gain/(Loss) On Available-for-sale Securities | TransUnion Intermediate-Predecessor
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total	0				0
Change	0
Accumulated other comprehensive income (loss), total	0				0
TransUnion [Member] | TransUnion [Member]
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total		-24.4	-117.5	-73.2
Change		-24.4	-44.3	-48.8
Purchase accounting adjustments		1.4
Accumulated other comprehensive income (loss), total		-24.4	-117.5	-73.2
TransUnion [Member] | Foreign Currency Translation Adjustment | TransUnion [Member]
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total		-20.7	-116.8	-72.6
Change		-20.7	-44.2	-51.9
Purchase accounting adjustments		1.4
Accumulated other comprehensive income (loss), total		-20.7	-116.8	-72.6
TransUnion [Member] | Net Unrealized Gain/(Loss) On Hedges | TransUnion [Member]
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total		-3.7	-0.8	-0.6
Change		-3.7	-0.2	3.1
Purchase accounting adjustments		0
Accumulated other comprehensive income (loss), total		-3.7	-0.8	-0.6
TransUnion [Member] | Net Unrealized Gain/(Loss) On Available-for-sale Securities | TransUnion [Member]
Component accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), total		0	0.1	0
Change		0	0.1	0
Purchase accounting adjustments		0
Accumulated other comprehensive income (loss), total		$0	$0.10	$0

Financial_Statements_of_Guaran

Financial Statements of Guarantors (Details 2) (Transunion Intermediate [Member], TransUnion Intermediate-Predecessor, USD $)	4 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Statement of Comprehensive Income [Abstract]
Net income	($52.40)
Other comprehensive income (loss), net of tax
Foreign currency translation, net	2.5
Net unrealized loss on hedges	0
Other comprehensive loss	2.5
Comprehensive income (loss)	-49.9
Less: comprehensive income (loss) attributable to noncontrolling interests	-2.8
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	($52.70)

Financial_Statements_of_Guaran1

Financial Statements of Guarantors (Details 3) (Transunion Intermediate [Member], TransUnion Intermediate-Predecessor, USD $)	4 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012
Transunion Intermediate [Member] | TransUnion Intermediate-Predecessor
Cash flows from operating activities:
Net income	($52.40)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by (used in) operating activities:
Depreciation and amortization	29.2
Loss on early extinguishment of debt	0
Stock-based compensation	2
Amortization of deferred financing fees	3.9
Provision (reduction) for losses on trade accounts receivable	3.1
Change in control transaction fees	20.9
Deferred taxes	-18.3
Amortization of senior notes purchase accounting fair value adjustment and note discount	0
Equity in net income of affiliates, net of dividends	-3.7
(Gains) / losses on sale of other assets	0.1
Other	-0.7
Changes in assets and liabilities:
Trade accounts receivable	-24.7
Other current and long-term assets	1.5
Trade accounts payable	1.6
Other current and long-term liabilities	89.9
Net cash provided by (Used in) operating activities	52.4
Cash flows from investing activities:
Capital expenditures	-20.4
Purchases of trading securities	-1.1
Proceeds from sale of trading securities	1.1
Proceeds from sale of other assets	0
Acquisitions and purchases of noncontrolling interests, net of cash acquired	-0.1
Other Payments to Acquire Businesses	0
Other	0.9
Cash (used in) provided by investing activities	-19.6
Cash flows from financing activities:
Proceeds from senior secured term loan	0
Proceeds from revolving line of credit	0
Repayments of Lines of Credit	0
Extinguishment of senior secured term loan	0
Repayments of debt	-14.6
Treasury stock purchases	-1.3
Distribution of merger consideration	-1.3
Debt financing fees	-6.1
Change in control transaction fees	-20.9
Distributions to noncontrolling interests	-0.4
Dividends to TransUnion Holding	0
Other	-0.4
Cash provided by (used in) financing activities	-45
Effect of exchange rate changes on cash and cash equivalents	0.8
Net change in cash and cash equivalents	($11.40)

Condensed_Financial_Informatio1

Condensed Financial Information of TransUnion Holding Company, Inc.(Details) (TransUnion Parent [Member], USD $)	10 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Available-for-sale securities, net	$0	$0.10	$0
Current assets:
Due from TransUnion Intermediate		86.2	52.7
Other current assets		22.7	7.5
Total current assets		108.9	60.2
Equity method investments		1,505.60	1,584.60
Other assets		20.9	28.1
Total assets		1,635.40	1,672.90
Current liabilities:
Trade accounts payable		0.1	0.2
Other current liabilities		18.3	33.4
Total current liabilities		18.4	33.6
Long-term debt		998.7	998.3
Other liabilities		31.2	13.1
Total liabilities		1,048.30	1,045
Stockholders' equity:
Common stock, $0.01 par value; 200.0 million shares authorized at December 31, 2014 and December 31, 2013, 111.4 million and 110.7 million shares issued as of December 31, 2014 and December 31, 2013, respectively; and 110.9 million and 110.2 million shares outstanding as of December 31, 2014 and December 31, 2013, respectively		1.1	1.1
Additional paid-in capital		1,138	1,121.80
Treasury stock at cost; 0.5 million shares at December 31, 2014 and December 31, 2013		-4.3	-4.1
Accumulated deficit		-430.2	-417.7
Accumulated other comprehensive income (loss)		-117.5	-73.2
Total stockholders’ equity		587.1	627.9
Total liabilities and stockholders’ equity		1,635.40	1,672.90
Operating expenses
Selling, general and administrative	0.9	1.4	1.3
Total operating expenses	0.9	1.4	1.3
Operating income (loss)	-0.9	-1.4	-1.3
Non-operating income and expense
Interest expense	-52.2	-97	-96.3
Earnings from equity method investments	43	49.1	43.2
Other income and (expense), net	-16.5	-0.2	-0.2
Total non-operating income and expense	-25.7	-48.1	-53.3
Income (loss) before income taxes	-26.6	-49.5	-54.6
(Provision) benefit for income taxes	0	37	37.3
Net income (loss) attributable to TransUnion Corp.	-26.6	-12.5	-17.3
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	-22.1	-47.9	-54.8
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	1.4	3.8	3
Statement of Comprehensive Income [Abstract]
Net unrealized gain	-20.7	-44.1	-51.8
Net unrealized loss on hedges	-3.7	-0.2	3
Total other comprehensive loss, net of tax	-24.4	-44.2	-48.8
Comprehensive loss attributable to TransUnion	-51	-56.7	-66.1
Net unrealized gain	0	0.2	0
Provision for income taxes	0	-0.1	0
Statement of Cash Flows
Net cash provided by (Used in) operating activities	-16.4	-9.4	-1.5
Cash flows from investing activities:
Acquisition of noncontrolling interests in TransUnion Corp. subsidiaries	-1,582.30	0	0
Capital investment in TransUnion Corp.	-80.8	0	0
Cash (used in) provided by investing activities	-1,663.10	0	0
Cash flows from financing activities:
Debt financing fees	-41.3	0	-0.9
Proceeds from issuance of common stock	1,097.30	9.6	5.8
Treasury stock purchases	-0.7	-0.2	-3.4
Dividends	-373.8	0	0
Cash provided by (used in) financing activities	1,679.50	9.4	1.5
Proceeds paid to TransUnion Holding from its consolidated subsidiaries	27.9	90.3	94.2
Net unrealized gain (loss)	-5.9	-0.6	4.8
Amortization of accumulated loss	0	0.3	0
Benefit (provision) for income taxes	2.2	0.1	-1.8
9.625% notes
Cash flows from financing activities:
Proceeds from notes	600	0	0
8.125% notes
Cash flows from financing activities:
Proceeds from notes	$398	$0	$0
TransUnion [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock, Shares Authorized		200,000,000	200,000,000
Cash flows from financing activities:
Common stock, shares issued		111,400,000	110,700,000
Common stock, shares outstanding		110,900,000	110,200,000
Treasury stock at cost, shares		500,000	500,000

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts [Member]
Movement in valuation allowances and reserves
Balance at Beginning of Year	$0.70	$1.70	$0
Charged to Costs and Expenses	3.2	0.8	-1.9
Charged to Other Accounts	0	0	3.7
Deductions	-1.5	-1.8	-0.1
Balance at End of Year	2.4	0.7	1.7
Allowance for deferred tax assets [Member]
Movement in valuation allowances and reserves
Balance at Beginning of Year	25.9	27.2	0
Charged to Costs and Expenses	19.5	4.8	5
Charged to Other Accounts	0	0	24.8
Deductions	-3.3	-6.1	-2.6
Balance at End of Year	$42.10	$25.90	$27.20