TransUnion (TRU) 10-Q 25 Jul 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information shares in Millions	6 Months Ended
	Jun. 30, 2018shares
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Entity Registrant Name	TransUnion
Entity Central Index Key	1,552,033
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	184.7

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 192.3	$ 115.8
Trade accounts receivable, net of allowance of $11.8 and $9.9	422.2	326.7
Other current assets	168.7	146.2
Current assets of discontinued operations	70.4	0
Total current assets	853.6	588.7
Property, plant and equipment, net of accumulated depreciation and amortization of $333.0 and $299.3	202.9	198.6
Goodwill, net	3,392.3	2,368.8
Other intangibles, net of accumulated amortization of $1,079.0 and $993.6	2,518.1	1,825.8
Other assets	143.2	136.6
Total assets	7,110.1	5,118.5
Current liabilities:
Trade accounts payable	171.5	131.3
Short-term debt and current portion of long-term debt	139.2	119.3
Other current liabilities	216.6	207.8
Current liabilities of discontinued operations	9.5	0
Total current liabilities	536.8	458.4
Long-term debt	4,071.3	2,345.3
Deferred taxes	545.6	419.4
Other liabilities	42.1	70.8
Total liabilities	5,195.8	3,293.9
Stockholders’ equity:
Common stock, $0.01 par value; 1.0 billion shares authorized at June 30, 2018 and December 31, 2017, 188.9 million and 187.4 million shares issued at June 30, 2018 and December 31, 2017, respectively, and 184.7 million shares and 183.2 million shares outstanding as of June 30, 2018 and December 31, 2017, respectively	1.9	1.9
Additional paid-in capital	1,898.7	1,863.5
Treasury stock at cost; 4.2 million shares at June 30, 2018 and December 31, 2017, respectively	(139.3)	(138.8)
Retained earnings	243.2	137.4
Accumulated other comprehensive loss	(187.5)	(135.3)
Total TransUnion stockholders’ equity	1,817	1,728.7
Noncontrolling interests	97.3	95.9
Total stockholders’ equity	1,914.3	1,824.6
Total liabilities and stockholders’ equity	$ 7,110.1	$ 5,118.5

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Trade accounts receivable, allowance	$ 11.8	$ 9.9
Property, plant and equipment, accumulated depreciation and amortization	333	299.3
Other intangibles, net of accumulated amortization	$ 1,079	$ 993.6
Common Stock, Par Value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	1,000	1,000
Common Stock, Shares, Issued	188.9	187.4
Common Stock, Shares, Outstanding	184.7	183.2
Treasury Stock, Shares	4.2	4.2

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 563.1	$ 474.8	$ 1,100.5	$ 929.7
Operating expenses
Cost of services (exclusive of depreciation and amortization below)	189.1	151.9	371.4	303
Selling, general and administrative	171.6	149.2	334.9	293.8
Depreciation and amortization	68	58.2	134.6	116.3
Total operating expenses	428.7	359.3	840.9	713.1
Operating income	134.4	115.5	259.6	216.6
Non-operating income and (expense)
Interest expense	(25.9)	(22.6)	(48.5)	(44.1)
Interest income	1.4	1.4	2.1	2.7
Earnings from equity method investments	2.9	2	5.2	3.7
Other income and (expense), net	(39.7)	(4.2)	(42.3)	(10.8)
Total non-operating income and (expense)	(61.3)	(23.4)	(83.5)	(48.5)
Income from continuing operations before income taxes	73.1	92.1	176.1	168.1
Provision for income taxes	(15.8)	(24.8)	(43.5)	(36.3)
Income from continuing operations	57.3	67.3	132.6	131.8
Discontinued operations, net of tax	0	0	0	0
Net income	57.3	67.3	132.6	131.8
Less: net income attributable to the noncontrolling interests	(2.3)	(2.4)	(4.5)	(4.5)
Net income attributable to TransUnion	55	64.9	128.1	127.3
Net Income
Income from continuing operations	57.3	67.3	132.6	131.8
Less: income from continuing operations attributable to noncontrolling interests	(2.3)	(2.4)	(4.5)	(4.5)
Income from continuing operations attributable to common stockholders	55	64.9	128.2	127.3
Discontinued operations, net of tax	0	0	0	0
Income from continuing operations attributable to TransUnion	55	64.9	128.2	127.3
Net income attributable to TransUnion	$ 55	$ 64.9	$ 128.1	$ 127.3
Basic earnings per common share from:
Income from continuing operations attributable to TransUnion common stockholders, Basic	$ 0.30	$ 0.36	$ 0.70	$ 0.70
Discontinued operations, net of tax, Basic	0	0	0	0
Net Income attributable to TransUnion common stockholders, Basic	0.30	0.36	0.70	0.70
Diluted earnings per common share from:
Income from continuing operations attributable to TransUnion common stockholders, Diluted	0.29	0.34	0.67	0.67
Discontinued operations, net of tax, Diluted	0	0	0	0
Net Income attributable to TransUnion common stockholders, Diluted	$ 0.29	$ 0.34	$ 0.67	$ 0.67
Weighted Average Number of Shares Outstanding, Basic	184.3	181.9	184	182.3
Weighted Average Number of Shares Outstanding, Diluted	190.8	189.3	190.5	189.8

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 57.3	$ 67.3	$ 132.6	$ 131.8
Foreign currency translation:
Foreign currency translation adjustment	(80.9)	(7.8)	(65.9)	26.4
Benefit (expense) for income taxes	0.7	(0.4)	0.1	(0.4)
Foreign currency translation, net	(80.2)	(8.2)	(65.8)	26
Hedge instruments:
Hedge instruments Net change on interest rate cap	4.2	(3.5)	14.1	(0.1)
Hedge instruments: Amortization of accumulated loss	0	0.1	0	0.2
Hedge instruments: (Expense) benefit for income taxes	(1)	1.4	(3.5)	0
Hedge instruments, net	3.2	(2)	10.6	0.1
Available-for-sale debt securities:
Available-for-sale debt securities: Net unrealized loss	(0.1)	0	(0.1)	(0.2)
Available-for-sale debt securities: Benefit for income taxes	0	0	0	0.1
Available-for-sale debt securities, net	(0.1)	0	(0.1)	(0.1)
Total other comprehensive income (loss), net of tax	(77.1)	(10.2)	(55.3)	26
Comprehensive income (loss)	(19.8)	57.1	77.3	157.8
Less: comprehensive income attributable to noncontrolling interests	0.9	(2.3)	(1.4)	(6.8)
Comprehensive income (loss) attributable to TransUnion	$ (18.9)	$ 54.8	$ 75.9	$ 151

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 132.6	$ 131.8
Add: loss from discontinued operations, net of tax	0	0
Income from continuing operations	132.6	131.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	134.6	116.3
Loss on debt financing transactions	11.9	5
Amortization and loss on fair value of hedge instrument	(0.7)	0.3
Impairment of Cost Method Investment, net	1.4	0
Equity in net income of affiliates, net of dividends	(0.2)	(3.2)
Deferred taxes	(8.9)	(18.3)
Stock-based compensation	21.3	15.9
Payment of contingent obligation	0	(2)
Provision for losses on trade accounts receivable	3.4	1.8
Other	1.8	(3.9)
Changes in assets and liabilities:
Trade accounts receivable	(46.6)	(11.4)
Other current and long-term assets	(17.4)	(42.2)
Trade accounts payable	25.9	3.5
Other current and long-term liabilities	(30.2)	(22.7)
Cash provided by operating activities of continuing operations	230.5	172.2
Cash provided by discontinued operations	0	0
Cash provided by operating activities	230.5	172.2
Cash flows from investing activities:
Capital expenditures	(70.4)	(58)
Proceeds from sale of trading securities	1.8	2.5
Purchases of trading securities	(1.8)	(1.5)
Proceeds from sale of other investments	4.5	46.9
Purchases of other investments	(14.1)	(36)
Acquisitions and purchases of noncontrolling interests, net of cash acquired	(1,801.2)	(58.7)
Other	(0.5)	0.3
Cash used in investing activities	(1,881.7)	(104.5)
Cash flows from financing activities:
Proceeds from Senior Secured Term Loan B-4	1,000	0
Proceeds from Senior Secured Term Loan A-3	800	0
Proceeds from senior secured revolving line of credit	125	105
Payments of senior secured revolving line of credit	(135)	(60)
Repayments of debt	(24.2)	(24.9)
Debt financing fees	(33.6)	(5)
Proceeds from issuance of common stock and exercise of stock options	14.1	16.3
Dividends to shareholders	(13.8)	0
Treasury stock purchased	0	(133.5)
Distributions to noncontrolling interests	(0.1)	(0.3)
Payment of contingent obligation	0	(5.8)
Other	(0.5)	0
Cash provided by (used in) financing activities	1,731.9	(108.2)
Effect of exchange rate changes on cash and cash equivalents	(4.2)	0.3
Net change in cash and cash equivalents	76.5	(40.2)
Cash and cash equivalents, beginning of period	115.8	182.2
Cash and cash equivalents, end of period	192.3	142
Amortization of discount and deferred financing fees	$ 1.6	$ 1.3

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Total
Balance (in shares) at Dec. 31, 2017		183.2
Balance at Dec. 31, 2017	$ 1,824.6	$ 1.9	$ 1,863.5	$ (138.8)	$ 137.4	$ (135.3)	$ 95.9	$ 1,824.6
Net income attributable to TransUnion	128.1	0	0	0	128.1	0
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest							4.5
Net income (loss)	132.6							132.6
Other comprehensive income	(55.3)	0	0	0	0	(52.2)	(3.1)	(55.3)
Distributions to noncontrolling interests		0	0	0	0	0	(0.1)	(0.1)
Noncontrolling interests of acquired businesses		0	0	0	0	0	0.1	0.1
Stock-based compensation		$ 0	20.4	0	0	0	0	20.4
Employee share purchase plan		0.1
Employee share purchase plan		$ 0	4.8	0	0	0	0	4.8
Exercise of stock options		1.4
Exercise of stock options		$ 0	10	0	0	0	0	10
Treasury stock purchased		0
Treasury stock purchased		$ 0	0	(0.5)	0	0	0	(0.5)
Dividends to shareholders		0
Dividends to shareholders		$ 0	0	0	(14.1)	0	0	(14.1)
Other		$ 0	0	0	0	0	0.1	(0.1)
Balance (in shares) at Jun. 30, 2018		184.7
Balance at Jun. 30, 2018	$ 1,914.3	$ 1.9	1,898.7	(139.3)	243.2	(187.5)	97.3	1,914.3
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member]		0	0	0	(6)	0	(0.1)	(6.1)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-16 [Member]		$ 0	$ 0	$ 0	$ (2.2)	$ 0	$ 0	$ (2.2)

Significant Accounting and Repo

Significant Accounting and Reporting Policies	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Significant Accounting and Reporting Policies	Significant Accounting and Reporting Policies Basis of Presentation Any reference in this report to “the Company,” “we,” “our,” “us,” and “its’” are to TransUnion and its consolidated subsidiaries, collectively. The accompanying unaudited consolidated financial statements of TransUnion and subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information. In the opinion of management, all adjustments, including normal recurring adjustments, considered necessary for a fair presentation have been included. All significant intercompany transactions and balances have been eliminated. The operating results of TransUnion for the periods presented are not necessarily indicative of the results that may be expected for the full year ending December 31, 2018 . These unaudited consolidated financial statements should be read in conjunction with our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 , filed with the Securities and Exchange Commission (“SEC”) on February 13, 2018. Principles of Consolidation The consolidated financial statements of TransUnion include the accounts of TransUnion and all of its controlled subsidiaries. Investments in nonmarketable unconsolidated entities in which the Company is able to exercise significant influence are accounted for using the equity method. Investments in nonmarketable unconsolidated entities in which the Company is not able to exercise significant influence, our “Cost Method Investments,” are accounted for at our initial cost, minus any impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. 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 financial statements or notes to the consolidated financial statements. Recently Adopted Accounting Pronouncements On May 28, 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, Revenue from Contracts with Customers (ASC Topic 606), with several subsequent updates. This series of comprehensive guidance has replaced all existing revenue recognition guidance and is effective for annual reporting periods beginning after December 15, 2017, and interim periods therein. Under the new guidance, there is a five-step model to apply to revenue recognition. The five-steps consist of: (1) determination of whether a contract, an agreement between two or more parties that creates legally enforceable rights and obligations, exists; (2) identification of the performance obligations in the contract; (3) determination of the transaction price; (4) allocation of the transaction price to the performance obligations in the contract; and (5) recognition of revenue when (or as) the performance obligation is satisfied. We adopted this standard as of January 1, 2018, and used the modified retrospective approach applied to reflect the aggregate effect of all modifications of those contracts that were not completed as of that date. Under the modified retrospective approach, we recognized the cumulative effect of adopting ASC Topic 606 in the opening balance of retained earnings to reflect deferred revenue related to certain contracts where we satisfy performance obligations over time. There was no material impact on our consolidated financial statements or on how we recognize revenue upon adoption. Prior period amounts were not adjusted and the prior period amounts continue to be reported in accordance with previous accounting guidance. These financial statements include enhanced disclosures, particularly around contract assets and liabilities and the disaggregation of revenue. See Note 11, “Revenue,” and Note 14, “Reportable Segments,” for these enhanced disclosures. On January 5, 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The FASB issued technical corrections to this guidance in February 2018. This ASU is intended to improve the recognition and measurement of financial instruments. Among other things, the ASU requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value, if fair value is readily determinable, with changes in fair value recognized in net income. If fair value is not readily determinable, an entity may elect to measure equity investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. On January 1, 2018, we adopted this guidance and have availed ourselves of this measurement election for all currently held equity investments that do not have readily determinable fair values. See Note 6, “Investments in Affiliated Companies,” for the impact on our current financial statements, which was not material. On August 26, 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This ASU addresses the diversity in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. We adopted this guidance on January 1, 2018, and are required to apply it on a retrospective basis. Accordingly, we have reclassified certain payments made in 2017 in satisfaction of contingent obligations from financing activities to operating activities on our statement of cash flows. The reclassification was not material for the six months ended June 30, 2018, and will not be material for the full year. On October 16, 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory . This ASU requires companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the income statement in the period in which the transfer occurs. Intercompany transactions are generally eliminated in consolidation, however there may be income tax consequences of such transactions that do not eliminate. Prior to adoption, any income tax resulting from these transactions were deferred on the balance sheet as a prepaid asset until the asset leaves the consolidated group. The new guidance requires the income tax resulting from these transactions to be recognized in the income statement in the period in which the sale or transfer of the asset occurs. Further, the new guidance requires a modified retrospective approach upon adoption, with any previously established prepaid assets resulting from past intercompany sales or transfers to be reversed with an offset to retained earnings. On January 1, 2018, we adopted this guidance and reclassified our previously established prepaid assets, which were not material, to retained earnings. Recent Accounting Pronouncements Not Yet Adopted On February 25, 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . This ASU, among other things, will require us to record the future discounted present value of all future lease payments as a liability on our balance sheet, as well as a corresponding “right-to-use” asset, which is an asset that represents the right to use or control the use of a specified asset for the lease term, for all long-term leases. This guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are currently assessing the impact this guidance will have on our consolidated financial statements and will adopt this guidance on January 1, 2019. On June 16, 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. In addition, these amendments require the measurement of all expected credit losses for financial assets, including trade accounts receivable, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. This guidance is effective for annual reporting periods beginning after December 15, 2019, including interim periods therein. We are currently assessing the impact this guidance will have on our consolidated financial statements. On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The new standard is intended to improve and simplify accounting rules around hedge accounting. The guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods therein. We are currently assessing the impact this guidance will have on our consolidated financial statements. On February 14, 2018, the FASB issued ASU 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. These amendments provide an option to reclassify stranded tax effects within accumulated other comprehensive income to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recorded. This guidance is effective for fiscal years beginning after December 15, 2018, and interim periods therein. Early adoption is permitted. We are currently assessing the impact this guidance will have on our consolidated financial statements.

Callcredit Acquisition

Callcredit Acquisition	6 Months Ended
	Jun. 30, 2018
Business Acquisition [Line Items]
Business Combination Disclosure	Callcredit Acquisition On June 19, 2018 , we acquired 100% of the equity of Callcredit Information Group, Ltd. (“Callcredit”) for $1,408.2 million in cash, funded primarily by additional borrowings against our Senior Secured Credit Facility. See Note 9, “Debt,” for additional information about our Senior Secured Credit Facility. There was no contingent consideration resulting from this transaction. Callcredit, founded in 2000, is an U.K.-based information solutions company that, like TransUnion, provides data, analytics and technology solutions to help businesses and consumers make informed decisions. International expansion is a key growth strategy for TransUnion, and we expect to leverage strong synergies across TransUnion’s and Callcredit’s business models and solutions. Callcredit revenue and operating income since the date of acquisition, which are not material, have been included as part of the International segment in the accompanying consolidated statements of income. Due to the timing of the closing of this transaction, differences in the basis of accounting and differences in certain accounting policies, we have not yet completed our analysis of the required disclosures about pro forma revenue and earnings of the combined entity as though the acquisition had occurred on January 1, 2017. As we refine our understanding of the basis of accounting and policy differences, and as we refine our purchase price allocation, we will include these required pro forma disclosures next quarter. We have identified and categorized certain operations of Callcredit that we do not consider core to our business as discontinued operations of our International segment as of the date of acquisition. These discontinued operations consist of businesses that do not align with our stated strategic objectives. We expect to sell these businesses within a year, and we do not expect to have a significant continuing involvement with any of these operations after the date of disposal. We have categorized the assets and liabilities of these discontinued operations on separate lines on the face of our balance sheet and in the table below. These amounts are based on estimates that will be refined as we complete the fair-value allocation of the purchase price of Callcredit. Purchase Price Allocation The allocation of the purchase price to the identifiable assets acquired and liabilities assumed is preliminary pending a full fair value assessment, which we expect to complete within one year. The preliminary fair value of the assets acquired and liabilities assumed as of June 30, 2018 consisted of the following: (in millions) Fair Value Trade accounts receivable $ 45.3 Property and equipment 4.4 Goodwill (1) 829.4 Identifiable intangible assets 554.6 All other assets 37.2 Assets of discontinued operations (2) 71.5 Total assets acquired 1,542.4 Existing debt — All other liabilities (124.7 ) Liabilities of discontinued operations (2) (9.5 ) Net assets of the acquired company $ 1,408.2 (1) For tax purposes, we estimate none of goodwill is tax deductible. (2) We have categorized certain lines of business of Callcredit as discontinued operations in our consolidated financial statements. The preliminary fair value of assets and liabilities of these discontinued operations include an estimate of the fair value of the identifiable intangible assets and goodwill acquired. We will revise these estimates as we finalize our analysis of these discontinued operations and purchase price allocation. We recorded the excess of the purchase price over the preliminary fair value of the net tangible and identifiable intangible assets acquired and liabilities assumed as goodwill in a new reportable unit in our International segment. The purchase price of Callcredit exceeded the preliminary fair value of the net assets acquired primarily due to growth opportunities, the assembled workforce, synergies associated with internal use software and other technological and operational efficiencies. Identifiable Amortizable Intangible Assets The preliminary fair values of the amortizable intangible assets acquired consisted of the following as of June 30, 2018 : (in millions) Estimated Useful Life Fair Value Database and credit files 15 years $ 363.1 Technology and software 7 years 37.7 Customer relationships and trademarks 20 years 153.8 Total identifiable assets $ 554.6 We estimate the preliminary weighted-average useful life of the identifiable intangible assets to be approximately 15 years, 7 months . Acquisition Costs As of June 30, 2018 , we have incurred approximately $18.2 million of related acquisition costs, including investment banker fees, legal fees, due diligence and other external costs that we have recorded in other income and expense. The Company will incur additional acquisition-related costs, including legal fees, valuation fees and other professional fees in the next several quarters that we will record in other income and expense. iovation and Healthcare Payment Specialists, LLC Acquisitions During the second quarter of 2018, we acquired 100% of the equity of iovation, Inc. (“iovation”) and Healthcare Payment Specialists, LLC (“HPS”). iovation is a provider of advanced device identity and consumer authentication services that helps businesses and consumers safely transact in a digital world. The results of operations of iovation, which are not material to our consolidated financial statements, have been included as part of our USIS segment in our consolidated statements of income since the date of the acquisition. HPS provides expertise and technology solutions to help medical care providers maximize Medicare reimbursements. The results of operations of HPS, which are not material to our consolidated financial statements, have been included as part of our USIS segment in our consolidated statements of income since the date of the acquisition. The allocation of the purchase price to the identifiable assets acquired and liabilities assumed for these acquisitions is preliminary pending full fair value assessments, which we expect to complete within one year. Based on the preliminary purchase price allocations for these acquisitions, we recorded approximately $218 million of goodwill and $230 million of amortizable intangible assets in addition to what we recorded for Callcredit as discussed above. We estimate the weighted-average useful lives of the iovation and HPS amortizable intangible assets to be approximately 15 years .

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value The following table summarizes financial instruments measured at fair value, on a recurring basis, as of June 30, 2018 : (in millions) Total Level 1 Level 2 Level 3 Assets Interest rate caps $ 24.4 $ — $ 24.4 $ — Trading securities 12.8 9.2 3.6 — Available-for-sale debt securities 3.0 — 3.0 — Total $ 40.2 $ 9.2 $ 31.0 $ — Liabilities Contingent consideration $ (1.5 ) $ — $ — $ (1.5 ) Total $ (1.5 ) $ — $ — $ (1.5 ) 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 the 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 caps. 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 debt securities valued at their current quoted prices. These securities mature between 2027 and 2033. The interest rate caps fair values are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps in conjunction with the cash payments related to financing the premium of the interest rate caps. The variable interest rates used in the calculation of projected receipts on the caps are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. See Note 9, “Debt,” for additional information regarding interest rate caps. All 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 other-than-temporary gains or losses on available-for-sale securities and there were no significant realized or unrealized gains or losses on any of our securities for any of the periods presented. Level 3 instruments consist of contingent obligations related to companies we have acquired with remaining maximum payouts totaling $15.9 million . These obligations are contingent upon meeting certain quantitative or qualitative performance metrics through 2018, and are included in other current liabilities on our balance sheet. The fair values of the obligations are determined based on an income approach, using our expectations of the future expected 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 the three and six months ended June 30, 2018 , there were no significant gains or losses as a result of changes to the fair value of these obligations.

Other Current Assets

Other Current Assets	6 Months Ended
	Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	Other Current Assets Other current assets consisted of the following: (in millions) June 30, December 31, 2017 Prepaid expenses $ 85.6 $ 59.0 Other receivables 27.2 16.5 Other investments 23.6 18.3 Income taxes receivable 15.1 23.7 Available-for-sale debt securities 3.0 3.3 Deferred financing fees 0.6 0.6 CFPB escrow deposit — 13.9 Other 13.6 10.9 Total other current assets $ 168.7 $ 146.2 The increase in prepaid expenses is due primarily to prepaid assets of the entities we acquired in 2018. Other receivables include amounts recoverable under insurance policies for certain litigation costs. Other investments include non-negotiable certificates of deposit that are recorded at their carrying value. Upon adoption of ASC Topic 606, we have recorded contract assets, which are not significant and are included in the “other” line above. See Note 11, “Revenue,” for a further discussion about our contract assets.

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets Other assets consisted of the following: (in millions) June 30, December 31, 2017 Investments in affiliated companies $ 77.8 $ 79.2 Interest rate caps 24.4 9.4 Other investments 15.3 13.5 Trading securities 12.8 12.7 Deposits 4.4 14.6 Deferred financing fees 1.9 2.0 Other 6.6 5.2 Total other assets $ 143.2 $ 136.6 Other investments include non-negotiable certificates of deposit that are recorded at their carrying value. See Note 6, “Investments in Affiliated Companies,” for additional information about investment in affiliated companies. See Note 9, “Debt,” for additional information about the interest rate caps.

Investments in Affiliated Compa

Investments in Affiliated Companies	6 Months Ended
	Jun. 30, 2018
Investments in Affiliated Companies [Abstract]
Equity Method Investments and Joint Ventures Disclosure	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. We use the equity method to account for nonmarketable investments in affiliates 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, any impairments, as well as for purchases and sales of our ownership interest. We account for nonmarketable equity securities in which we are not able to exercise significant influence, our Cost Method Investments, at our initial cost, minus any impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. For these investments, we adjust the carrying value for any purchases or sales of our ownership interests. We record any dividends received from these investments as other income in non-operating income and expense. There were no material gain or loss adjustments to our investments in affiliated companies during the three and six months ended June 30, 2018 or 2017 . Investments in affiliated companies consisted of the following: (in millions) June 30, December 31, 2017 Equity method investments $ 39.7 $ 42.8 Cost method Investments 38.1 36.4 Total investments in affiliated companies $ 77.8 $ 79.2 These balances are included in other assets in the consolidated balance sheets. Earnings from equity method investments, which are included in non-operating income and expense, and dividends received from equity method investments consisted of the following: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 Earnings from equity method investments $ 2.9 $ 2.0 $ 5.2 $ 3.7 Dividends received from equity method investments $ 4.3 $ 0.3 $ 5.0 $ 0.5 Dividends received from cost method investments for the three and six months ended June 30, 2018, was $0.7 million in each period, and for the three and six months ended June 30, 2017, was $0.7 million in each period.

Other Current Liabilities

Other Current Liabilities	6 Months Ended
	Jun. 30, 2018
Payables and Accruals [Abstract]
Other Current Liabilities	Other Current Liabilities Other current liabilities consisted of the following: (in millions) June 30, December 31, 2017 Accrued payroll $ 64.2 $ 84.6 Accrued legal and regulatory 47.7 46.3 Accrued employee benefits 33.6 34.1 Deferred revenue 32.9 13.2 Income taxes payable 13.1 8.5 Accrued interest 2.9 1.5 Contingent consideration 1.5 1.1 Other 20.7 18.5 Total other current liabilities $ 216.6 $ 207.8 The decrease in accrued payroll was due primarily to the payment of accrued bonuses during the first quarter of 2018 that were earned in 2017, partially offset by 2018 bonus accruals. The increase in deferred revenue includes the impact of adopting ASC Topic 606. See Note 11, “Revenue,” for additional information about our deferred revenue. See Note 3, “Fair Value,” for additional information related to our contingent consideration obligations.

Other Liabilities

Other Liabilities	6 Months Ended
	Jun. 30, 2018
Other Liabilities Disclosure [Abstract]
Other Liabilities Disclosure	Other Liabilities Other liabilities consisted of the following: (in millions) June 30, December 31, 2017 Unrecognized tax benefits $ 15.2 $ 12.3 Retirement benefits 10.6 12.2 Income tax payable 7.3 25.6 Purchase consideration payable — 12.2 Other 9.0 8.5 Total other liabilities $ 42.1 $ 70.8

Debt

Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Debt outstanding consisted of the following: (in millions) June 30, December 31, 2017 Senior Secured Term Loan B-3, payable in quarterly installments through April 9, 2023, with periodic variable interest at LIBOR or alternate base rate, plus applicable margin (4.09% at June 30, 2018, and 3.57% at December 31, 2017), net of original issue discount and deferred financing fees of $5.5 million and $5.1 million, respectively, at June 30, 2018, and original issue discount and deferred financing fees of $6.2 million and $3.7 million, respectively, at December 31, 2017 $ 1,960.9 $ 1,971.5 Senior Secured Term Loan A, payable in quarterly installments through August 9, 2022, with periodic variable interest at LIBOR or alternate base rate, plus applicable margin (3.84% at June 30, 2018, and 3.07% at December 31, 2017), net of original issue discount and deferred financing fees of $3.2 million and $4.1 million, respectively, at June 30, 2018, and original issue discount and deferred financing fees of $1.4 million and $0.3 million, respectively, at December 31, 2017 1,180.1 395.8 Senior Secured Term Loan B-4, payable in quarterly installments through June 19, 2025, with periodic variable interest at LIBOR or alternate base rate, plus applicable margin (4.09% at June 30, 2018), net of original issue discount and deferred financing fees of $2.5 million and $11.4 million, respectively, at June 30, 2018 986.1 — Senior Secured Revolving Line of Credit 75.0 85.0 Other notes payable 7.3 11.0 Capital lease obligations 1.1 1.3 Total debt 4,210.5 2,464.6 Less short-term debt and current portion of long-term debt (139.2 ) (119.3 ) Total long-term debt $ 4,071.3 $ 2,345.3 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 June 30, 2018, were as follows: (in millions) June 30, 2018 $ 105.3 2019 71.7 2020 93.5 2021 89.9 2022 1,044.9 Thereafter 2,837.1 Unamortized original issue discounts and deferred financing fees (31.9 ) Total debt $ 4,210.5 Senior Secured Credit Facility On June 15, 2010, we entered into a senior secured credit facility with various lenders. This facility has been amended several times and currently consists of the Senior Secured Term Loan A, the Senior Secured Term Loan B-3, the Senior Secured Term Loan B-4 and the Senior Secured Revolving Line of Credit. On May 2, 2018, we amended certain provisions of our senior secured credit facility. This amendment among other things, allowed us the option to elect between two testing dates for the calculation of ratio requirements to enter into certain transactions. This amendment resulted in $0.1 million of fees expensed and recorded in other income and expense in the consolidated statements of income for the three and six months ended June 30, 2018, and $2.6 million of refinancing fees deferred on the balance sheet to be amortized into interest expense over the life of the loans. During the first quarter of 2018, we repaid $30.0 million of the outstanding borrowings under the Senior Secured Revolving Line of Credit. During the second quarter of 2018, we borrowed a total of $125.0 million under the Senior Secured Revolving Line of Credit to fund an acquisition and for general corporate purposes. On June 19, 2018, we borrowed an additional $800.0 million against our Senior Secured Term Loan A and $600.0 million against a new tranche 4 of our Senior Secured Term Loan B (“Senior Secured Term Loan B-4”) to fund the acquisition of Callcredit. On June 29, 2018, we borrowed an additional $400.0 million of our Senior Secured Term Loan B-4 to fund another acquisition and to repay a portion of our Senior Secured Revolving Line of Credit. Our net incremental borrowings during the second quarter of 2018 was $20.0 million under the Senior Secured Revolving Line of Credit. The new financing resulted in $11.8 million of fees expensed and recorded in other income and expense in the consolidated statements of income for the three and six months ended June 30, 2018, and $19.6 million of financing fees deferred on the balance sheet to be amortized into interest expense over the life of the loans. As of June 30, 2018, we had $75.0 million outstanding under the Senior Secured Revolving Line of Credit and could have borrowed up to the additional $225.0 million available. The terms of the additional borrowings in the second quarter of 2018 on our Senior Secured Term Loan A are the same as the terms of the other outstanding borrowings under the Senior Secured Term Loan A. Interest rates on the new Senior Secured Term Loan B-4 are based on LIBOR, unless otherwise elected, plus a margin of 2.00% . We are required to make principal payments on the Senior Secured Term Loan B-4 at the end of each quarter of 0.25% starting in the third quarter of 2018, with the remaining balance due June 19, 2025. On January 31, 2017, we refinanced and amended certain provisions of our Senior Secured Term Loan B. The refinancing resulted in $5.0 million of refinancing fees and other net costs expensed and recorded in other income and expense in the consolidated statements of income in the first quarter of 2017. TransUnion also has the ability to request incremental loans on the same terms under the existing senior secured credit facility up to the greater of an additional $675.0 million and 100% of Consolidated EBITDA. Consolidated EBITDA is reduced to the extent that the senior secured net leverage ratio is above 4.25 -to-1. In addition, so long as the senior secured net leverage ratio does not exceed 4.25 -to-1.0, we may incur additional incremental loans, subject to certain additional conditions and commitments by existing or new lenders to fund any additional borrowings. With certain exceptions, the senior secured credit facility 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. The senior secured net leverage test must be met as a condition to incur additional indebtedness, make certain investments, and may be required to make certain restricted payments. The senior secured net leverage ratio must not exceed 5.5 -to-1 at any such test date. TransUnion may make dividend payments up to an unlimited amount under the terms of the senior secured credit facility provided that no default or event of default exists and so long as the total net leverage ratio does not exceed 4.75 -to-1. As of June 30, 2018 , we were in compliance with all debt covenants. On December 18, 2015, we entered into interest rate cap agreements with various counter-parties that effectively cap our LIBOR exposure on a portion of our existing senior secured term loans or similar replacement debt at 0.75% beginning June 30, 2016. We have designated these cap agreements as cash flow hedges. The current aggregate notional amount under these agreements is $1,467.7 million and will decrease each quarter until the agreement terminates on June 30, 2020. In July 2016, we began to pay the various counter-parties a fixed rate on the outstanding notional amounts of between 0.98% and 0.994% and receive payments to the extent LIBOR exceeds 0.75% . The interest rate caps are recorded on the balance sheet at fair value. The effective portion of changes in the fair value of the interest rate cap agreements is recorded in other comprehensive income (loss). The ineffective portion of changes in the fair value of the caps, which is due to, and will continue to result from, the cost of financing the cap premium, is recorded in other income and expense. The effective portion of the change in the fair value of the caps resulted in an unrealized gain of $3.2 million and $10.6 million , net of tax, recorded in other comprehensive income for the three and six months ended June 30, 2018, respectively. The effective portion of the change in the fair value of the caps resulted in an unrealized loss of $2.2 million and $0.1 million , net of tax, recorded in other comprehensive income for three and six months ended June 30, 2017, respectively. The ineffective portion of the change in the fair value of the caps resulted in no gain or loss recorded in other income and expense for the three months ended June 30, 2018. The ineffective portion of the change in the fair value of the caps resulted in a gain of $0.7 million recorded in other income and expense for the six months ended June 30, 2018. The ineffective portion of the change in the fair value of the caps resulted in a loss of $0.2 million and $0.1 million recorded in other income and expense for three and six months ended June 30, 2017, respectively. In accordance with ASC 815, the fair value of the interest rate caps at inception is reclassified from other comprehensive income to interest expense in the same period the interest expense on the underlying hedged debt impacts earnings. Based on how the fair value of interest rate caps are determined, the earlier interest periods have lower fair values at inception than the later interest periods, resulting in less interest expense being recognized in the earlier periods compared with the later periods. Any payments we receive to the extent LIBOR exceeds 0.75% is also reclassified from other comprehensive income to interest expense in the period received. Interest income reclassified from other comprehensive income to interest expense related to the fair value of the portion of the caps expiring in the three and six months ended June 30, 2018, was $0.5 million and $0.3 million , respectively. Interest expense reclassified from other comprehensive income to interest expense related to the fair value of the portion of the caps expiring in the three and six months ended June 30, 2017, was $1.1 million and $2.6 million , respectively. We expect to reclassify approximately $6.0 million from other comprehensive income to interest expense related to the fair value of the portion of the caps expiring and payments received to the extent LIBOR exceeds 0.75% in the next twelve months. Fair Value of Debt As of June 30, 2018 , the fair value of our variable-rate Senior Secured Term Loan A and Senior Secured Revolving Line of Credit, excluding original issue discounts and deferred fees, approximates the carrying value. As of June 30, 2018, the fair value of our Senior Secured Term Loan B-3 and B-4, excluding original issue discounts and deferred fees, was $1,965.3 million and $996.9 million , respectively. The fair values of our variable-rate term loans are determined using Level 2 inputs, and quoted market prices for the publicly traded instruments.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2018
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity	Stockholders’ Equity Common Stock On February 13, 2018, we announced that our board of directors has approved a dividend policy pursuant to which we intend to pay quarterly cash dividends on our common stock. On May 9, 2018 , the board of directors declared a dividend for the first quarter of 2018 of $0.075 per share to holders of record as of the close of business on May 23, 2018 . The total dividend declared was $14.1 million , of which $13.8 million was paid on June 7, 2018 , with the remainder due to employees who hold restricted stock units when and if those units vest. Preferred Stock We have 100.0 million shares of preferred stock authorized. No preferred stock had been issued or was outstanding as of June 30, 2018 .

Revenue

Revenue	6 Months Ended
	Jun. 30, 2018
Revenue [Abstract]
Revenue	Revenue All of our revenue is derived from contracts with customers and is reported as revenue in the Consolidated Statement of Income. A performance obligation is a promise in a contract to transfer a distinct good or service to a customer, and is the unit of account under ASC Topic 606. We have contracts with two general groups of performance obligations; those that require us to stand ready to provide goods and services to a customer to use as and when requested (“Stand Ready Performance Obligations”) and those that do not require us to stand ready (“Other Performance Obligations”) . Our Stand Ready Performance Obligations include obligations to stand ready to provide data, process transactions, access our databases, software-as-a-service and direct-to-consumer products, rights to use our intellectual property and other services. Our Other Performance Obligations include the sale of certain batch data sets and various professional and other services. Most of our Stand Ready Performance Obligations consist of a series of distinct goods and services that are substantially the same and have the same monthly pattern of transfer to our customers. We consider each month of service in this time series to be a distinct performance obligation and, accordingly, recognize revenue over time. For a majority of these Stand Ready Performance Obligations the total contractual price is variable because our obligation is to process an unknown quantity of transactions, as and when requested by our customers, over the contract period. We allocate the variable price to each month of service using the time-series concept and recognize revenue based on the most likely amount of consideration to which we will be entitled to , which is generally the amount we have the right to invoice. This monthly amount can be based on the actual volume of units delivered or any guaranteed minimum, if higher. Certain Stand Ready Performance Obligation fees result from contingent fee based contracts that require us to provide services before we have an enforceable right to payment. For these performance obligations, we recognize revenue at the point in time the contingency is met and we have an enforceable contract and right to payment. Certain of our Stand Ready Performance Obligation contracts include non-recurring, non-refundable up-front fees to cover our costs of setting up files or configuring systems to enable our customers to access our services. These fees are not fees for distinct performance obligations. When these fees are insignificant in relation to the total contract value we recognize such fees as revenue when invoiced. If such fees are significant we recognize them as revenue over the duration of the contract, the period of time for which we have contractually enforceable rights and obligations. For contracts where such fees are for a distinct performance obligation, we recognize revenue as or when the performance obligation is satisfied. Certain of our Other Performance Obligations, including certain batch data sets and certain professional and other services, are delivered at a point in time. Accordingly, we recognize revenue upon delivery, once we have satisfied that obligation. For certain Other Performance Obligations, including certain professional and other services, we recognize revenue over time, based on an estimate of progress towards completion of that obligation. For all contracts that include a Stand Ready Performance Obligation with variable pricing, we are unable to estimate the variable price attributable to future performance obligations because the number of units to be purchased is not known. As a result, we use the exception available to forgo disclosures about revenue attributable to the future performance obligations where we recognize revenue using the time-series concept as discussed above, including those qualifying for the right to invoice practical expedient. We also use the exception available to forgo disclosures about revenue attributable to contracts with expected durations of one year or less. During the sixth-month period ending June 30, 2018 , we recognized $16.1 million of revenue that was included in the balance of our deferred revenue at the beginning of the year as adjusted for the cumulative effect of adopting ASC Topic 606. In certain circumstances we apply the guidance in ASC Topic 606 to a portfolio of contracts with similar characteristics. We use estimates and assumptions when accounting for a portfolio that reflect the size and composition of the portfolio of contracts. Our contracts generally include standard commercial payment terms generally acceptable in each region, and do not include financing with extended payment terms. We have no significant obligations for refunds, warranties, or similar obligations . Our revenue does not include taxes collected from our customers. Accounts receivable are shown separately on our balance sheet. Contract assets and liabilities result due to the timing of revenue recognition, billings and cash collections. Contract assets include our right to payment for goods and services already transferred to a customer when the right to payment is conditional on something other than the passage of time, for example contracts where we recognize revenue over time but do not have a contractual right to payment until we complete the contract. Contract assets are included in our other current assets and are not material as of June 30, 2018 . Contract liabilities include current and long-term deferred revenue which are included in other current liabilities and other liabilities. The long-term portion is not significant. For additional disclosures about the disaggregation of our revenue see Note 14, “Reportable Segments”.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
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 incentive stock plans. For the three and six months ended June 30, 2018 , there were less than 0.1 million anti-dilutive stock-based awards outstanding for each respective period. In addition, there were less than 0.1 million contingently-issuable stock-based awards outstanding that were excluded from the diluted earnings per share calculation because the contingencies had not been met. For the three and six months ended June 30, 2017 , there were zero and less than 0.1 million anti-dilutive stock-based awards outstanding, respectively. In addition, there were no contingently-issuable stock-based awards outstanding that were excluded from the diluted earnings per share calculation because the contingencies had not been met. Basic and diluted weighted average shares outstanding and earnings per share were as follows: Three Months Ended June 30, Six Months Ended (in millions, except per share data) 2018 2017 2018 2017 Income from continuing operations $ 57.3 $ 67.3 $ 132.6 $ 131.8 Less: income from continuing operations attributable to noncontrolling interests (2.3 ) (2.4 ) (4.5 ) (4.5 ) Income from continuing operations attributable to TransUnion 55.0 64.9 128.2 127.3 Discontinued operations, net of tax (1) — — — — Net income attributable to TransUnion $ 55.0 $ 64.9 $ 128.1 $ 127.3 Basic earnings per common share from: Income from continuing operations attributable to TransUnion $ 0.30 $ 0.36 $ 0.70 $ 0.70 Discontinued operations, net of tax — — — — Net Income attributable to TransUnion $ 0.30 $ 0.36 $ 0.70 $ 0.70 Diluted earnings per common share from: Income from continuing operations attributable to TransUnion $ 0.29 $ 0.34 $ 0.67 $ 0.67 Discontinued operations, net of tax — — — — Net Income attributable to TransUnion $ 0.29 $ 0.34 $ 0.67 $ 0.67 Weighted-average shares outstanding: Basic 184.3 181.9 184.0 182.3 Diluted 190.8 189.3 190.5 189.8 (1) Discontinued operations for the three and six months ended June 30, 2018, rounds to zero . As a result of displaying amounts in millions, there is a rounding difference in the six months ended June 30, 2018. Discontinued operations for the three and six months ended June 30, 2017, is zero .

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We have not revised any of our 2017 provisional estimates under SAB No. 118 and ASU No 2018-05, but we are continuing to gather information and are waiting on further guidance from the IRS, the SEC and the FASB on the Tax Cuts and Jobs Act of 2017 (the “Act”). Effective January 1, 2018, the U.S. federal statutory rate was reduced from 35% to 21% as a result of the Act. For the three months ended June 30, 2018 , we reported an effective tax rate of 21.7% , which was higher than the 21% U.S. federal statutory rate due primarily to $10.3 million of tax expense related to the impact of the Act, foreign rate differential, unrecognized tax benefits, and non-deductible acquisition and other costs, partially offset by $9.8 million of excess tax benefits on stock-based compensation. For the six months ended June 30, 2018 , we reported an effective tax rate of 24.7% , which was higher than the 21% U.S. federal statutory rate due primarily to $24.6 million of tax expense related to the impact of the Act, foreign rate differential, unrecognized tax benefits and non-deductible acquisition and other costs, partially offset by $18.1 million of excess tax benefits on stock-based compensation. For the three months ended June 30, 2017, we reported an effective tax rate of 27.0% , which was lower than the 35% U.S. federal statutory rate due primarily to the impact of excess tax benefits related to the adoption of ASU No. 2016-09. Effective January 1, 2017, this new guidance requires any excess tax benefits for share-based payment award transactions to be recorded in the income statement. Accordingly, we recognized excess tax benefits on stock option exercises, which resulted in a decrease in tax expense of $11.4 million . For the six months ended June 30, 2017, we reported an effective tax rate of 21.6% , which was lower than 35% U.S. federal statutory rate due primarily to the excess tax benefits on stock option exercises of $23.0 million , and the first quarter 2017 ownership structure change for certain international subsidiaries which resulted in a decrease in income tax expense of $4.3 million . The total amount of unrecognized tax benefits was $15.2 million as of June 30, 2018 , and $12.3 million as of December 31, 2017 . The amounts that would affect the effective tax rate if recognized are $8.5 million and $8.2 million , respectively. There were no significant liabilities for accrued interest for taxes or accrued tax penalties as of June 30, 2018 , or December 31, 2017 . We are regularly audited by federal, state 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 amounts 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. Generally, tax years 2010 and forward remain open for examination in some state and foreign jurisdictions, and tax years 2012 and forward remain open for examination for U.S. federal income tax purposes.

Reportable Segments

Reportable Segments	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Reportable Segments	Reportable Segments 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,” included in our audited financial statements for the year ended December 31, 2017 , of our Annual Report on Form 10-K filed with the SEC on February 13, 2018, as updated in Note 1, “Significant Accounting and Reporting Polices,” and Note 11, “Revenue,” above. We evaluate the performance of segments based on revenue and operating income. The following is a more detailed description of the three reportable segments and the Corporate unit, which provides support services to each segment: U.S. Information Services U.S. Information Services (“USIS”) provides consumer reports, risk scores, analytical and decisioning services 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. The 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 financial services, insurance, healthcare and other industries. We derive our USIS segment revenue from three operating platforms: Online Data Services, Marketing Services and Decision Services. Online Data Services encompass services delivered in real-time using both credit and public record datasets. We also provide online reports that link public record datasets for qualified businesses seeking to locate consumers, specific assets or investigate relationships among consumers, businesses and locations. Collectively, the reports, characteristics and scores, with variations tailored for specific industries, form the basis of Online Data Services. We also provide online services to help businesses manage fraud and authenticate a consumer’s identity when they initiate a new business relationship. Additionally, we provide data to businesses to help them satisfy “know your customer” compliance requirements and to confirm an individual’s identity. Marketing Services help our customers develop marketing lists of prospects via direct mail, web and mobile. Our databases are used by our customers to contact individuals to extend firm offers of credit or insurance. We provide portfolio review services, which are periodic reviews of our customers’ existing accounts, to help our customers develop cross-selling offers to their existing customers and monitor and manage risk in their existing consumer portfolios. We also provide trigger services, which are daily notifications of changes to a consumer profile. Decision Services, our software-as-a-service offerings, includes a number of platforms that help businesses interpret data and predictive model results and apply their customer-specific criteria to facilitate real-time automated decisions at the time of customer interaction. Our customers use Decision Services to evaluate business risks and opportunities, including those associated with new consumer credit and checking accounts, insurance applications, optimizing accounts receivable management and collections, patient registrations and insurance coverages, and apartment rental requests. International The International segment provides services similar to our USIS segment to businesses in select regions outside the United States. 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. We report our International segment revenue in two categories, developed markets and emerging markets. Our developed markets are the United Kingdom, Canada, and Hong Kong. Our emerging markets are Africa, Latin America, Asia Pacific and India. 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 are supported by educational content and customer support. Our Consumer Interactive segment serves consumers through both direct and indirect channels. Corporate In addition, Corporate provides support services for each of the segments, holds investments, and conducts enterprise functions. Certain costs incurred in Corporate that are not directly attributable to one or more of the segments remain in Corporate. These costs are typically enterprise-level costs and are primarily administrative in nature. Selected segment financial information and disaggregated revenue consisted of the following: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 Gross revenue: U.S. Information Services: Online Data Services $ 234.9 $ 190.6 $ 463.2 $ 373.0 Marketing Services 56.3 46.5 107.9 88.5 Decision Services 66.9 60.8 129.4 118.6 Total U.S. Information Services 358.2 297.9 700.5 580.1 International: Developed Markets 43.2 31.0 74.5 59.0 Emerging Markets 63.1 56.3 127.7 111.7 Total International 106.3 87.3 202.3 170.7 Total Consumer Interactive 117.6 105.4 235.5 210.3 Total revenue, gross 582.1 490.6 1,138.2 961.1 Intersegment revenue eliminations: U.S. Information Services (17.5 ) (14.7 ) (34.9 ) (29.1 ) International Developed Markets (1.2 ) (1.1 ) (2.4 ) (2.1 ) International Emerging Markets (0.1 ) — (0.1 ) (0.1 ) Consumer Interactive (0.2 ) — (0.3 ) — Total intersegment eliminations (19.0 ) (15.8 ) (37.8 ) (31.4 ) Total revenue, net $ 563.1 $ 474.8 $ 1,100.5 $ 929.7 Gross operating income: U.S. Information Services $ 95.7 $ 83.7 $ 178.6 $ 156.0 International 15.9 12.6 30.0 21.5 Consumer Interactive 54.4 49.7 107.8 97.7 Corporate (31.6 ) (30.5 ) (56.7 ) (58.6 ) Total operating income $ 134.4 $ 115.5 $ 259.6 $ 216.6 Intersegment operating income eliminations: U.S. Information Services $ (17.1 ) $ (14.3 ) $ (34.2 ) $ (28.4 ) International (0.9 ) (0.8 ) (1.6 ) (1.6 ) Consumer Interactive 17.9 15.1 35.7 30.0 Corporate — — — — Total intersegment eliminations $ — $ — $ — $ — As a result of displaying amounts in millions, rounding differences may exist in the table above. A reconciliation of operating income to income before income taxes for the periods presented is as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 Operating income from segments $ 134.4 $ 115.5 $ 259.6 $ 216.6 Non-operating income and expense (61.3 ) (23.4 ) (83.5 ) (48.5 ) Income from continuing operations before income taxes $ 73.1 $ 92.1 $ 176.1 $ 168.1 Earnings from equity method investments included in non-operating income and expense for the periods presented were as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 U.S. Information Services $ 0.6 $ 0.5 $ 1.3 $ 0.8 International 2.3 1.5 3.9 2.9 Total $ 2.9 $ 2.0 $ 5.2 $ 3.7

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2018
Loss Contingencies [Line Items]
Commitments and Contingencies Disclosure	Contingencies Litigation In view of the inherent unpredictability of litigation and regulatory matters, particularly where the damages sought are substantial or indeterminate or when the proceedings or investigations are in the early stages, we cannot determine with any degree of certainty the timing or ultimate resolution of litigation and regulatory matters or the eventual loss, fines, penalties or business impact, if any, that may result. We establish reserves for litigation and regulatory matters when those matters present loss contingencies that are both probable and can be reasonably estimated. The actual costs of resolving litigation and regulatory matters, however, 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 consolidated financial statements in particular quarterly or annual periods. The following discussion describes material developments in previously disclosed material legal proceedings that occurred in the three months ended June 30, 2018. Refer to Part I, Item 3, of our Annual Report on Form 10-K for the year ended December 31, 2017, for a full description of our material pending legal proceedings. The Miller and Larson cases have been consolidated in the United States District Court for the Northern District of California, and on May 1, 2018, we agreed to the terms of a settlement of all class and individual claims, pursuant to which we will pay attorneys’ fees and representative plaintiffs’ awards, which are not material, mail corrective disclosures to class members and provide them three years of single-bureau credit monitoring. On July 10, 2018, the Court granted preliminary approval of the settlement and entered a schedule for remaining proceedings. The final approval hearing is scheduled for November 28, 2018. If the settlement is not ultimately approved by the Court, we intend to continue to defend these matters vigorously.

Significant Accounting and Re23

Significant Accounting and Reporting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Any reference in this report to “the Company,” “we,” “our,” “us,” and “its’” are to TransUnion and its consolidated subsidiaries, collectively. The accompanying unaudited consolidated financial statements of TransUnion and subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information. In the opinion of management, all adjustments, including normal recurring adjustments, considered necessary for a fair presentation have been included. All significant intercompany transactions and balances have been eliminated. The operating results of TransUnion for the periods presented are not necessarily indicative of the results that may be expected for the full year ending December 31, 2018 . These unaudited consolidated financial statements should be read in conjunction with our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 , filed with the Securities and Exchange Commission (“SEC”) on February 13, 2018.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements of TransUnion include the accounts of TransUnion and all of its controlled subsidiaries. Investments in nonmarketable unconsolidated entities in which the Company is able to exercise significant influence are accounted for using the equity method. Investments in nonmarketable unconsolidated entities in which the Company is not able to exercise significant influence, our “Cost Method Investments,” are accounted for at our initial cost, minus any impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer.
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 financial statements or notes to the consolidated financial statements.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements On May 28, 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, Revenue from Contracts with Customers (ASC Topic 606), with several subsequent updates. This series of comprehensive guidance has replaced all existing revenue recognition guidance and is effective for annual reporting periods beginning after December 15, 2017, and interim periods therein. Under the new guidance, there is a five-step model to apply to revenue recognition. The five-steps consist of: (1) determination of whether a contract, an agreement between two or more parties that creates legally enforceable rights and obligations, exists; (2) identification of the performance obligations in the contract; (3) determination of the transaction price; (4) allocation of the transaction price to the performance obligations in the contract; and (5) recognition of revenue when (or as) the performance obligation is satisfied. We adopted this standard as of January 1, 2018, and used the modified retrospective approach applied to reflect the aggregate effect of all modifications of those contracts that were not completed as of that date. Under the modified retrospective approach, we recognized the cumulative effect of adopting ASC Topic 606 in the opening balance of retained earnings to reflect deferred revenue related to certain contracts where we satisfy performance obligations over time. There was no material impact on our consolidated financial statements or on how we recognize revenue upon adoption. Prior period amounts were not adjusted and the prior period amounts continue to be reported in accordance with previous accounting guidance. These financial statements include enhanced disclosures, particularly around contract assets and liabilities and the disaggregation of revenue. See Note 11, “Revenue,” and Note 14, “Reportable Segments,” for these enhanced disclosures. On January 5, 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The FASB issued technical corrections to this guidance in February 2018. This ASU is intended to improve the recognition and measurement of financial instruments. Among other things, the ASU requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value, if fair value is readily determinable, with changes in fair value recognized in net income. If fair value is not readily determinable, an entity may elect to measure equity investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. On January 1, 2018, we adopted this guidance and have availed ourselves of this measurement election for all currently held equity investments that do not have readily determinable fair values. See Note 6, “Investments in Affiliated Companies,” for the impact on our current financial statements, which was not material. On August 26, 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This ASU addresses the diversity in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. We adopted this guidance on January 1, 2018, and are required to apply it on a retrospective basis. Accordingly, we have reclassified certain payments made in 2017 in satisfaction of contingent obligations from financing activities to operating activities on our statement of cash flows. The reclassification was not material for the six months ended June 30, 2018, and will not be material for the full year. On October 16, 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory . This ASU requires companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the income statement in the period in which the transfer occurs. Intercompany transactions are generally eliminated in consolidation, however there may be income tax consequences of such transactions that do not eliminate. Prior to adoption, any income tax resulting from these transactions were deferred on the balance sheet as a prepaid asset until the asset leaves the consolidated group. The new guidance requires the income tax resulting from these transactions to be recognized in the income statement in the period in which the sale or transfer of the asset occurs. Further, the new guidance requires a modified retrospective approach upon adoption, with any previously established prepaid assets resulting from past intercompany sales or transfers to be reversed with an offset to retained earnings. On January 1, 2018, we adopted this guidance and reclassified our previously established prepaid assets, which were not material, to retained earnings. Recent Accounting Pronouncements Not Yet Adopted On February 25, 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . This ASU, among other things, will require us to record the future discounted present value of all future lease payments as a liability on our balance sheet, as well as a corresponding “right-to-use” asset, which is an asset that represents the right to use or control the use of a specified asset for the lease term, for all long-term leases. This guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are currently assessing the impact this guidance will have on our consolidated financial statements and will adopt this guidance on January 1, 2019. On June 16, 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. In addition, these amendments require the measurement of all expected credit losses for financial assets, including trade accounts receivable, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. This guidance is effective for annual reporting periods beginning after December 15, 2019, including interim periods therein. We are currently assessing the impact this guidance will have on our consolidated financial statements. On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The new standard is intended to improve and simplify accounting rules around hedge accounting. The guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods therein. We are currently assessing the impact this guidance will have on our consolidated financial statements. On February 14, 2018, the FASB issued ASU 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. These amendments provide an option to reclassify stranded tax effects within accumulated other comprehensive income to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recorded. This guidance is effective for fiscal years beginning after December 15, 2018, and interim periods therein. Early adoption is permitted. We are currently assessing the impact this guidance will have on our consolidated financial statements.

Callcredit Acquisition Callcred

Callcredit Acquisition Callcredit Acquisition (Tables) - Callcredit [Member]	6 Months Ended
	Jun. 30, 2018
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 is preliminary pending a full fair value assessment, which we expect to complete within one year. The preliminary fair value of the assets acquired and liabilities assumed as of June 30, 2018 consisted of the following: (in millions) Fair Value Trade accounts receivable $ 45.3 Property and equipment 4.4 Goodwill (1) 829.4 Identifiable intangible assets 554.6 All other assets 37.2 Assets of discontinued operations (2) 71.5 Total assets acquired 1,542.4 Existing debt — All other liabilities (124.7 ) Liabilities of discontinued operations (2) (9.5 ) Net assets of the acquired company $ 1,408.2 (1) For tax purposes, we estimate none of goodwill is tax deductible. (2) We have categorized certain lines of business of Callcredit as discontinued operations in our consolidated financial statements. The preliminary fair value of assets and liabilities of these discontinued operations include an estimate of the fair value of the identifiable intangible assets and goodwill acquired. We will revise these estimates as we finalize our analysis of these discontinued operations and purchase price allocation.
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The preliminary fair values of the amortizable intangible assets acquired consisted of the following as of June 30, 2018 : (in millions) Estimated Useful Life Fair Value Database and credit files 15 years $ 363.1 Technology and software 7 years 37.7 Customer relationships and trademarks 20 years 153.8 Total identifiable assets $ 554.6 We estimate the preliminary weighted-average useful life of the identifiable intangible assets to be approximately 15 years, 7 months .

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Financial Instruments Measured At Fair Value, on Recurring Basis	The following table summarizes financial instruments measured at fair value, on a recurring basis, as of June 30, 2018 : (in millions) Total Level 1 Level 2 Level 3 Assets Interest rate caps $ 24.4 $ — $ 24.4 $ — Trading securities 12.8 9.2 3.6 — Available-for-sale debt securities 3.0 — 3.0 — Total $ 40.2 $ 9.2 $ 31.0 $ — Liabilities Contingent consideration $ (1.5 ) $ — $ — $ (1.5 ) Total $ (1.5 ) $ — $ — $ (1.5 )

Other Current Assets (Tables)

Other Current Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	Other current assets consisted of the following: (in millions) June 30, December 31, 2017 Prepaid expenses $ 85.6 $ 59.0 Other receivables 27.2 16.5 Other investments 23.6 18.3 Income taxes receivable 15.1 23.7 Available-for-sale debt securities 3.0 3.3 Deferred financing fees 0.6 0.6 CFPB escrow deposit — 13.9 Other 13.6 10.9 Total other current assets $ 168.7 $ 146.2

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other assets	Other assets consisted of the following: (in millions) June 30, December 31, 2017 Investments in affiliated companies $ 77.8 $ 79.2 Interest rate caps 24.4 9.4 Other investments 15.3 13.5 Trading securities 12.8 12.7 Deposits 4.4 14.6 Deferred financing fees 1.9 2.0 Other 6.6 5.2 Total other assets $ 143.2 $ 136.6

Investments in Affiliated Com28

Investments in Affiliated Companies (Tables)	6 Months Ended
	Jun. 30, 2018
Investments in Affiliated Companies [Abstract]
Investments in and Advances to Affiliates	Investments in affiliated companies consisted of the following: (in millions) June 30, December 31, 2017 Equity method investments $ 39.7 $ 42.8 Cost method Investments 38.1 36.4 Total investments in affiliated companies $ 77.8 $ 79.2
Schedule Of Equity Investments Income Statement Information	Earnings from equity method investments, which are included in non-operating income and expense, and dividends received from equity method investments consisted of the following: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 Earnings from equity method investments $ 2.9 $ 2.0 $ 5.2 $ 3.7 Dividends received from equity method investments $ 4.3 $ 0.3 $ 5.0 $ 0.5

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	6 Months Ended
	Jun. 30, 2018
Payables and Accruals [Abstract]
Other Current Liabilities	Other current liabilities consisted of the following: (in millions) June 30, December 31, 2017 Accrued payroll $ 64.2 $ 84.6 Accrued legal and regulatory 47.7 46.3 Accrued employee benefits 33.6 34.1 Deferred revenue 32.9 13.2 Income taxes payable 13.1 8.5 Accrued interest 2.9 1.5 Contingent consideration 1.5 1.1 Other 20.7 18.5 Total other current liabilities $ 216.6 $ 207.8

Other Liabilties (Tables)

Other Liabilties (Tables)	6 Months Ended
	Jun. 30, 2018
Other Liabilities Disclosure [Abstract]
Other Noncurrent Liabilities	Other liabilities consisted of the following: (in millions) June 30, December 31, 2017 Unrecognized tax benefits $ 15.2 $ 12.3 Retirement benefits 10.6 12.2 Income tax payable 7.3 25.6 Purchase consideration payable — 12.2 Other 9.0 8.5 Total other liabilities $ 42.1 $ 70.8

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt outstanding	Debt outstanding consisted of the following: (in millions) June 30, December 31, 2017 Senior Secured Term Loan B-3, payable in quarterly installments through April 9, 2023, with periodic variable interest at LIBOR or alternate base rate, plus applicable margin (4.09% at June 30, 2018, and 3.57% at December 31, 2017), net of original issue discount and deferred financing fees of $5.5 million and $5.1 million, respectively, at June 30, 2018, and original issue discount and deferred financing fees of $6.2 million and $3.7 million, respectively, at December 31, 2017 $ 1,960.9 $ 1,971.5 Senior Secured Term Loan A, payable in quarterly installments through August 9, 2022, with periodic variable interest at LIBOR or alternate base rate, plus applicable margin (3.84% at June 30, 2018, and 3.07% at December 31, 2017), net of original issue discount and deferred financing fees of $3.2 million and $4.1 million, respectively, at June 30, 2018, and original issue discount and deferred financing fees of $1.4 million and $0.3 million, respectively, at December 31, 2017 1,180.1 395.8 Senior Secured Term Loan B-4, payable in quarterly installments through June 19, 2025, with periodic variable interest at LIBOR or alternate base rate, plus applicable margin (4.09% at June 30, 2018), net of original issue discount and deferred financing fees of $2.5 million and $11.4 million, respectively, at June 30, 2018 986.1 — Senior Secured Revolving Line of Credit 75.0 85.0 Other notes payable 7.3 11.0 Capital lease obligations 1.1 1.3 Total debt 4,210.5 2,464.6 Less short-term debt and current portion of long-term debt (139.2 ) (119.3 ) Total long-term debt $ 4,071.3 $ 2,345.3
Schedule of Maturities of Long-term Debt [Table Text Block]	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 June 30, 2018, were as follows: (in millions) June 30, 2018 $ 105.3 2019 71.7 2020 93.5 2021 89.9 2022 1,044.9 Thereafter 2,837.1 Unamortized original issue discounts and deferred financing fees (31.9 ) Total debt $ 4,210.5

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Basic and diluted weighted average shares outstanding and earnings per share were as follows: Three Months Ended June 30, Six Months Ended (in millions, except per share data) 2018 2017 2018 2017 Income from continuing operations $ 57.3 $ 67.3 $ 132.6 $ 131.8 Less: income from continuing operations attributable to noncontrolling interests (2.3 ) (2.4 ) (4.5 ) (4.5 ) Income from continuing operations attributable to TransUnion 55.0 64.9 128.2 127.3 Discontinued operations, net of tax (1) — — — — Net income attributable to TransUnion $ 55.0 $ 64.9 $ 128.1 $ 127.3 Basic earnings per common share from: Income from continuing operations attributable to TransUnion $ 0.30 $ 0.36 $ 0.70 $ 0.70 Discontinued operations, net of tax — — — — Net Income attributable to TransUnion $ 0.30 $ 0.36 $ 0.70 $ 0.70 Diluted earnings per common share from: Income from continuing operations attributable to TransUnion $ 0.29 $ 0.34 $ 0.67 $ 0.67 Discontinued operations, net of tax — — — — Net Income attributable to TransUnion $ 0.29 $ 0.34 $ 0.67 $ 0.67 Weighted-average shares outstanding: Basic 184.3 181.9 184.0 182.3 Diluted 190.8 189.3 190.5 189.8 (1) Discontinued operations for the three and six months ended June 30, 2018, rounds to zero . As a result of displaying amounts in millions, there is a rounding difference in the six months ended June 30, 2018. Discontinued operations for the three and six months ended June 30, 2017, is zero .

Reportable Segments (Tables)

Reportable Segments (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Selected Segment Financial Information and Disaggregated Revenue	Selected segment financial information and disaggregated revenue consisted of the following: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 Gross revenue: U.S. Information Services: Online Data Services $ 234.9 $ 190.6 $ 463.2 $ 373.0 Marketing Services 56.3 46.5 107.9 88.5 Decision Services 66.9 60.8 129.4 118.6 Total U.S. Information Services 358.2 297.9 700.5 580.1 International: Developed Markets 43.2 31.0 74.5 59.0 Emerging Markets 63.1 56.3 127.7 111.7 Total International 106.3 87.3 202.3 170.7 Total Consumer Interactive 117.6 105.4 235.5 210.3 Total revenue, gross 582.1 490.6 1,138.2 961.1 Intersegment revenue eliminations: U.S. Information Services (17.5 ) (14.7 ) (34.9 ) (29.1 ) International Developed Markets (1.2 ) (1.1 ) (2.4 ) (2.1 ) International Emerging Markets (0.1 ) — (0.1 ) (0.1 ) Consumer Interactive (0.2 ) — (0.3 ) — Total intersegment eliminations (19.0 ) (15.8 ) (37.8 ) (31.4 ) Total revenue, net $ 563.1 $ 474.8 $ 1,100.5 $ 929.7 Gross operating income: U.S. Information Services $ 95.7 $ 83.7 $ 178.6 $ 156.0 International 15.9 12.6 30.0 21.5 Consumer Interactive 54.4 49.7 107.8 97.7 Corporate (31.6 ) (30.5 ) (56.7 ) (58.6 ) Total operating income $ 134.4 $ 115.5 $ 259.6 $ 216.6 Intersegment operating income eliminations: U.S. Information Services $ (17.1 ) $ (14.3 ) $ (34.2 ) $ (28.4 ) International (0.9 ) (0.8 ) (1.6 ) (1.6 ) Consumer Interactive 17.9 15.1 35.7 30.0 Corporate — — — — Total intersegment eliminations $ — $ — $ — $ — As a result of displaying amounts in millions, rounding differences may exist in the table above.
Reconciliation of Operating Income (Loss) to Income (Loss) from Continuing Operations Before Income Tax	A reconciliation of operating income to income before income taxes for the periods presented is as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 Operating income from segments $ 134.4 $ 115.5 $ 259.6 $ 216.6 Non-operating income and expense (61.3 ) (23.4 ) (83.5 ) (48.5 ) Income from continuing operations before income taxes $ 73.1 $ 92.1 $ 176.1 $ 168.1
Earning from Equity Method Investments Included in Other Income and Expense, Net	Earnings from equity method investments included in non-operating income and expense for the periods presented were as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2018 2017 2018 2017 U.S. Information Services $ 0.6 $ 0.5 $ 1.3 $ 0.8 International 2.3 1.5 3.9 2.9 Total $ 2.9 $ 2.0 $ 5.2 $ 3.7

Callcredit Acquisition Callcr34

Callcredit Acquisition Callcredit Acquisition (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 19, 2018	Dec. 31, 2017
Assets
Goodwill1	$ 3,392.3		$ 2,368.8
Callcredit [Member]
Callcredit Acquisition [Abstract]
Business Acquisition, Effective Date of Acquisition	Jun. 19, 2018
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Acquisition, Name of Acquired Entity	Callcredit Information Group, Ltd. (“Callcredit”)
Payments to Acquire Businesses, Gross	$ 1,408.2
Contingent consideration	$ 0
Business Acquisition, Description of Acquired Entity	Callcredit, founded in 2000, is an U.K.-based information solutions company that, like TransUnion, provides data, analytics and technology solutions to help businesses and consumers make informed decisions.
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Segment Reporting, Assignment of Goodwill Not Complete	The allocation of the purchase price to the identifiable assets acquired and liabilities assumed is preliminary pending a full fair value assessment, which we expect to complete within one year.
Assets
Trade accounts receivable	$ 45.3
Property and equipment	4.4
Goodwill1	829.4
Identifiable intangible assets	554.6
All other assets	37.2
Assets of discontinued operations(2)	71.5
Total assets acquired	1,542.4
Liabilities and stockholders’ equity
Existing debt	0
All other liabilities	(124.7)
Liabilities of discontinued operations(2)	(9.5)
Net assets of the acquired company	1,408.2
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0
Identifiable Amortizable Intangible Assets [Abstract]
Finite-lived Intangible Assets Acquired	$ 554.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years 7 months
Acquisition Costs [Abstract]
Business Acquisition, Transaction Costs	$ 18.2
Callcredit [Member] | Database and credit files
Identifiable Amortizable Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	15 years
Finite-lived Intangible Assets Acquired	$ 363.1
Callcredit [Member] | Technology and software
Identifiable Amortizable Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	7 years
Finite-lived Intangible Assets Acquired	$ 37.7
Callcredit [Member] | Customer relationships and trademarks
Identifiable Amortizable Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	20 years
Finite-lived Intangible Assets Acquired	$ 153.8

Financial Instruments Measured

Financial Instruments Measured At Fair Value, on Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Contingent Consideration [Abstract]
Net income attributable to TransUnion	$ 55	$ 64.9	$ 128.1	$ 127.3
Level 2
Investments, Fair Value Disclosure [Abstract]
Other than Temporary Impairment Losses, Investments	0	0	0	0
Trading Securities, Change in Unrealized Holding Gain (Loss)	0	0	0	0
Trading Securities, Realized Gain (Loss)	0	0	0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	0	0	0	0
Available-for-sale Securities, Gross Realized Gain (Loss)	0	$ 0	$ 0	$ 0
Level 2 | Minimum [Member]
Investments, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale, Maturity, Date			Jan. 1, 2027
Level 2 | Maximum [Member]
Investments, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale, Maturity, Date			Dec. 31, 2033
Level 3
Contingent Consideration [Abstract]
Contingent Consideration, Maximum Payout	15.9		$ 15.9
Recorded Purchase Obligation, Date			Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0		$ 0
Fair Value, Recurring
Assets, Fair Value Disclosure [Abstract]
Interest rate caps	24.4		24.4
Trading securities	12.8		12.8
Available-for-sale debt securities	3		3
Total	40.2		40.2
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	(1.5)		(1.5)
Total	(1.5)		(1.5)
Fair Value, Recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Interest rate caps	0		0
Trading securities	9.2		9.2
Available-for-sale debt securities	0		0
Total	9.2		9.2
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	0		0
Total	0		0
Fair Value, Recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Interest rate caps	24.4		24.4
Trading securities	3.6		3.6
Available-for-sale debt securities	3		3
Total	31		31
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	0		0
Total	0		0
Fair Value, Recurring | Level 3
Assets, Fair Value Disclosure [Abstract]
Interest rate caps	0		0
Trading securities	0		0
Available-for-sale debt securities	0		0
Total	0		0
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	(1.5)		(1.5)
Total	$ (1.5)		$ (1.5)

Callcredit Acquisition iovation

Callcredit Acquisition iovation and Healthcare Payment Specialists, LLC (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 3,392.3	$ 2,368.8
iovation [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Acquisition, Name of Acquired Entity	iovation, Inc. (“iovation”)
Business Acquisition, Description of Acquired Entity	iovation is a provider of advanced device identity and consumer authentication services that helps businesses and consumers safely transact in a digital world.
Healthcare Payment Specialists (HPS) [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Acquisition, Name of Acquired Entity	Healthcare Payment Specialists, LLC (“HPS”).
Business Acquisition, Description of Acquired Entity	HPS provides expertise and technology solutions to help medical care providers maximize Medicare reimbursements.
iovation and Healthcare Payment Specialists Combined [Member]
Business Acquisition [Line Items]
Business Combination, Segment Reporting, Assignment of Goodwill Not Complete	The allocation of the purchase price to the identifiable assets acquired and liabilities assumed for these acquisitions is preliminary pending full fair value assessments, which we expect to complete within one year.
Goodwill	$ 218
Identifiable intangible assets	$ 230
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years

Other Current Assets (Detail)

Other Current Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 85.6	$ 59
Other receivables	27.2	16.5
Other investments	23.6	18.3
Income taxes receivable	15.1	23.7
Available-for-sale debt securities	3	3.3
Deferred financing fees	0.6	0.6
CFPB escrow deposit	0	13.9
Other	13.6	10.9
Total other current assets	$ 168.7	$ 146.2

Other Assets (Detail)

Other Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other assets
Investments in affiliated companies	$ 77.8	$ 79.2
Interest rate caps	24.4	9.4
Deposits	4.4	14.6
Other investments	15.3	13.5
Trading securities	12.8	12.7
Deferred financing fees	1.9	2
Other	6.6	5.2
Total other assets	$ 143.2	$ 136.6

Investments in Affiliated Com39

Investments in Affiliated Companies (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]
Unrealized Gain (Loss) on Securities	$ 0	$ 0	$ 0	$ 0
Equity method investments	39,700,000		39,700,000		$ 42,800,000
Cost method Investments	38,100,000		38,100,000		36,400,000
Total investments in affiliated companies	$ 77,800,000		$ 77,800,000		$ 79,200,000

Earnings and Dividends from Inv

Earnings and Dividends from Investment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Earnings from equity method investments	$ 2.9	$ 2	$ 5.2	$ 3.7
Dividends received from equity method investments	4.3	0.3	5	0.5
Dividends or Distributions Nonmarketable Equity Securities	$ 0.7	$ 0.7	$ 0.7	$ 0.7

Other Current Liabilities (Deta

Other Current Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Accrued payroll	$ 64.2	$ 84.6
Accrued legal and regulatory	47.7	46.3
Accrued employee benefits	33.6	34.1
Deferred revenue	32.9	13.2
Income taxes payable	13.1	8.5
Accrued interest	2.9	1.5
Contingent consideration	1.5	1.1
Other	20.7	18.5
Total other current liabilities	$ 216.6	$ 207.8

Other Liabilities (Details)

Other Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits	$ 15.2	$ 12.3
Retirement benefits	10.6	12.2
Income tax payable	7.3	25.6
Purchase consideration payable	0	12.2
Other	9	8.5
Total other liabilities	$ 42.1	$ 70.8

Debt outstanding (Detail)

Debt outstanding (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt outstanding	$ 4,210.5	$ 2,464.6
Less short-term debt and current portion of long-term debt	(139.2)	(119.3)
Total long-term debt	4,071.3	2,345.3
Debt Issuance Costs, Noncurrent, Net	1.9	2
Senior Secured Term Loan B-3 [Member]
Debt Instrument [Line Items]
Debt outstanding	$ 1,960.9	$ 1,971.5
Debt Instrument, Maturity Date	Apr. 9, 2023
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.09%	3.57%
Debt Instrument, Unamortized Discount (Premium), Net	$ 5.5	$ 6.2
Debt Issuance Costs, Noncurrent, Net	5.1	3.7
Debt Instrument, Fair Value Disclosure	1,965.3	1,993.8
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Debt outstanding	$ 1,180.1	$ 395.8
Debt Instrument, Maturity Date	Aug. 9, 2022
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.84%	3.07%
Debt Instrument, Unamortized Discount (Premium), Net	$ 3.2	$ 1.4
Debt Issuance Costs, Noncurrent, Net	4.1	0.3
Debt Instrument, Fair Value Disclosure	1,177.3	395.8
Senior Secured Term Loan B-4 [Member] [Member]
Debt Instrument [Line Items]
Debt outstanding	$ 986.1	$ 0
Debt Instrument, Maturity Date	Jun. 19, 2025
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.09%	0.00%
Debt Instrument, Unamortized Discount (Premium), Net	$ 2.5	$ 0
Debt Issuance Costs, Noncurrent, Net	11.4	0
Debt Instrument, Fair Value Disclosure	996.9	0
Senior Secured Revolving Line of Credit
Debt Instrument [Line Items]
Debt outstanding	75	85
Debt Instrument, Fair Value Disclosure	75	85
Other notes payable
Debt Instrument [Line Items]
Debt outstanding	7.3	11
Capital lease obligations
Debt Instrument [Line Items]
Debt outstanding	$ 1.1	$ 1.3

Debt Schedule of Debt Maturitie

Debt Schedule of Debt Maturities (Details) $ in Millions	Jun. 30, 2018USD ($)
Debt Instrument [Line Items]
2,018	$ 105.3
2,019	71.7
2,020	93.5
2,021	89.9
2,022	1,044.9
Thereafter	2,837.1
Unamortized original issue discounts and deferred financing fees	(31.9)
Total debt	$ 4,210.5

Senior Secured Credit Facility

Senior Secured Credit Facility (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2016
Senior Secured Credit Facility
Repayments of Lines of Credit				$ 135,000,000	$ 60,000,000
Debt and Capital Lease Obligations	$ 4,210,500,000			4,210,500,000		$ 2,464,600,000
Incremental Borrowings, Amount	$ 675,000,000			$ 675,000,000
Incremental Borrowings Criteria, Percentage of Consolidated EBITDA	100.00%			100.00%
Incremental Borrowings Criteria, Senior Secured Leverage ratio	4.25			4.25
Net Leverage Ratio Requirement	5.5			5.5
Net Leverage Ratio Requirement, Dividends	4.75			4.75
Hedge instruments Net change on interest rate cap	$ 4,200,000		$ (3,500,000)	$ 14,100,000	(100,000)
Debt Issuance Costs, Noncurrent, Net	$ 1,900,000			$ 1,900,000		2,000,000
Interest Rate Cap [Member]
Senior Secured Credit Facility
Derivative, Cap Interest Rate	0.75%			0.75%			0.75%
Derivative, Notional Amount	$ 1,467,700,000			$ 1,467,700,000
Hedge instruments Net change on interest rate cap	3,200,000		2,200,000	10,600,000	100,000
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0		200,000	700,000	100,000
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 500,000		1,100,000	300,000	$ 2,600,000
Cash Flow Hedge Loss to be Reclassified within Twelve Months				$ (6,000,000)
Interest Rate Cap [Member] | London Interbank Offered Rate (LIBOR) [Member]
Senior Secured Credit Facility
Debt Instrument, Description of Variable Rate Basis				LIBOR
Interest Rate Cap [Member] | Minimum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	0.98%			0.98%
Interest Rate Cap [Member] | Maximum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	0.994%			0.994%
Senior Secured Term Loan B-3 [Member]
Senior Secured Credit Facility
Debt Related Commitment Fees and Debt Issuance Costs			$ 5,000,000
Debt Instrument, Maturity Date				Apr. 9, 2023
Debt and Capital Lease Obligations	$ 1,960,900,000			$ 1,960,900,000		1,971,500,000
Debt Instrument, Fair Value Disclosure	$ 1,965,300,000			$ 1,965,300,000		$ 1,993,800,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.09%			4.09%		3.57%
Debt Instrument, Unamortized Discount (Premium), Net	$ 5,500,000			$ 5,500,000		$ 6,200,000
Debt Issuance Costs, Noncurrent, Net	5,100,000			$ 5,100,000		3,700,000
Senior Secured Term Loan A [Member]
Senior Secured Credit Facility
Debt Instrument, Maturity Date				Aug. 9, 2022
Proceeds from Issuance of Debt	800,000,000
Debt and Capital Lease Obligations	1,180,100,000			$ 1,180,100,000		395,800,000
Debt Instrument, Fair Value Disclosure	$ 1,177,300,000			$ 1,177,300,000		$ 395,800,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.84%			3.84%		3.07%
Debt Instrument, Unamortized Discount (Premium), Net	$ 3,200,000			$ 3,200,000		$ 1,400,000
Debt Issuance Costs, Noncurrent, Net	4,100,000			4,100,000		300,000
Senior Secured Revolving Line of Credit
Senior Secured Credit Facility
Repayments of Lines of Credit		$ 30,000,000
Debt and Capital Lease Obligations	75,000,000			75,000,000		85,000,000
Line of Credit Facility, Increase (Decrease), Net	20,000,000
Line of Credit, Current	75,000,000			75,000,000
Line of Credit Facility, Remaining Borrowing Capacity	225,000,000			225,000,000
Debt Instrument, Fair Value Disclosure	75,000,000			$ 75,000,000		85,000,000
Senior Secured Term Loan B-4 [Member] [Member]
Senior Secured Credit Facility
Debt Instrument, Maturity Date				Jun. 19, 2025
Proceeds from Issuance of Debt	400,000,000
Proceeds from Issuance of Senior Long-term Debt	600,000,000
Debt and Capital Lease Obligations	$ 986,100,000			$ 986,100,000		0
Debt Instrument, Basis Spread on Variable Rate				2.00%
Debt Instrument, Payment Terms	0.0025
Debt Instrument, Fair Value Disclosure	$ 996,900,000			$ 996,900,000		$ 0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.09%			4.09%		0.00%
Debt Instrument, Unamortized Discount (Premium), Net	$ 2,500,000			$ 2,500,000		$ 0
Debt Issuance Costs, Noncurrent, Net	11,400,000			$ 11,400,000		$ 0
Senior Secured Revolving Line of Credit
Senior Secured Credit Facility
Proceeds from Lines of Credit	125,000,000
May Amendment [Member]
Senior Secured Credit Facility
Debt Related Commitment Fees and Debt Issuance Costs	100,000
Payments of Debt Issuance Costs	2,600,000
June Amendments [Member]
Senior Secured Credit Facility
Debt Related Commitment Fees and Debt Issuance Costs	11,800,000
Payments of Debt Issuance Costs	$ 19,600,000

Stockholders' Equity (Details)

Stockholders' Equity (Details) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares
Dividends, Common Stock [Abstract]
Dividends Payable, Date Declared	May 9, 2018
Dividends Payable, Amount Per Share | $ / shares	$ 0.075
Dividends Payable, Date of Record	May 23, 2018
Dividends Payable, Date to be Paid	Jun. 7, 2018
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Shares Authorized	100
Preferred Stock, Shares Issued	0
Preferred Stock, Shares Outstanding	0
Dividend Declared [Member]
Dividends, Common Stock [Abstract]
Dividends, Common Stock, Cash | $	$ 14.1
Dividend Paid [Member]
Dividends, Common Stock [Abstract]
Dividends, Common Stock, Cash | $	$ 13.8

Revenue (Details)

Revenue (Details)	6 Months Ended
	Jun. 30, 2018USD ($)
Revenue, Performance Obligation [Abstract]
Number of Types of Performance Obligations	2
Contract with Customer, Refund Liability	$ 0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Performance Obligation [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 16,100,000
Stand Ready Performance Obligations [Member]
Revenue, Performance Obligation [Abstract]
Revenue, Performance Obligation, Description of Good or Service	those that require us to stand ready to provide goods and services to a customer to use as and when requested (“Stand Ready Performance Obligations”)
Other Performance Obligations [Member]
Revenue, Performance Obligation [Abstract]
Revenue, Performance Obligation, Description of Good or Service	those that do not require us to stand ready (“Other Performance Obligations”)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0.1	0	0.1	0.1
Net Income
Income from continuing operations	$ 57.3	$ 67.3	$ 132.6	$ 131.8
Less: net income attributable to the noncontrolling interests	(2.3)	(2.4)	(4.5)	(4.5)
Income from continuing operations attributable to common stockholders	55	64.9	128.2	127.3
Discontinued operations, net of tax	0	0	0	0
Net income attributable to TransUnion	$ 55	$ 64.9	$ 128.1	$ 127.3
Basic earnings per common share from:
Income from continuing operations attributable to TransUnion common stockholders, Basic	$ 0.30	$ 0.36	$ 0.70	$ 0.70
Discontinued operations, net of tax, Basic	0	0	0	0
Net Income attributable to TransUnion common stockholders, Basic	0.30	0.36	0.70	0.70
Diluted earnings per common share from:
Income from continuing operations attributable to TransUnion common stockholders, Diluted	0.29	0.34	0.67	0.67
Discontinued operations, net of tax, Diluted	0	0	0	0
Net Income attributable to TransUnion common stockholders, Diluted	$ 0.29	$ 0.34	$ 0.67	$ 0.67
Weighted Average Number of Shares Outstanding, Basic	184.3	181.9	184	182.3
Weighted Average Number of Shares Outstanding, Diluted	190.8	189.3	190.5	189.8
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	$ 0	$ 0	$ 0	$ 0
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0.1	0	0.1	0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Examination [Line Items]
U.S. federal statutory rate	21.00%	35.00%		21.00%	35.00%	35.00%
Effective tax benefit rate	21.70%	27.00%		24.70%	21.60%
Unrecognized tax benefits	$ 15.2			$ 15.2		$ 12.3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	8.5			8.5		8.2
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0			$ 0		$ 0
State Jurisdiction [Member] | Tax Year 2010 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,010
State Jurisdiction [Member] | Tax Year 2011 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,011
State Jurisdiction [Member] | Tax Year 2012 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,012
State Jurisdiction [Member] | Tax Year 2013 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,013
State Jurisdiction [Member] | Tax Year 2014 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,014
State Jurisdiction [Member] | Tax Year 2015 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,015
State Jurisdiction [Member] | Tax Year 2016 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,016
State Jurisdiction [Member] | Tax Year 2017 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,017
State Jurisdiction [Member] | Tax Year 2018 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,018
Foreign Tax Authority [Member] | Tax Year 2010 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,010
Foreign Tax Authority [Member] | Tax Year 2011 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,011
Foreign Tax Authority [Member] | Tax Year 2012 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,012
Foreign Tax Authority [Member] | Tax Year 2013 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,013
Foreign Tax Authority [Member] | Tax Year 2014 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,014
Foreign Tax Authority [Member] | Tax Year 2015 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,015
Foreign Tax Authority [Member] | Tax Year 2016 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,016
Foreign Tax Authority [Member] | Tax Year 2017 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,017
Foreign Tax Authority [Member] | Tax Year 2018 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,018
U.S. Federal Tax Authority [Member] | Tax Year 2012 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,012
U.S. Federal Tax Authority [Member] | Tax Year 2013 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,013
U.S. Federal Tax Authority [Member] | Tax Year 2014 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,014
U.S. Federal Tax Authority [Member] | Tax Year 2015 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,015
U.S. Federal Tax Authority [Member] | Tax Year 2016 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,016
U.S. Federal Tax Authority [Member] | Tax Year 2017 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,017
U.S. Federal Tax Authority [Member] | Tax Year 2018 [Member]
Income Tax Examination [Line Items]
Open Tax Year				2,018
Tax expense related to the impact of the Act, foreign rate differential, and unrecognized tax benefits [Member]
Income Tax Examination [Line Items]
Other Tax Expense (Benefit)	10.3			$ 24.6
Excess tax benefit [Member]
Income Tax Examination [Line Items]
Other Tax Expense (Benefit)	$ (9.8)	$ (11.4)		$ (18.1)	$ (23)
Ownership Structure Change [Member]
Income Tax Examination [Line Items]
Other Tax Expense (Benefit)			$ (4.3)

Reportable Segments - Additiona

Reportable Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018segment
Segment Reporting Information [Line Items]
Number of Reportable Segments	3
Number of Corporate Units	1
U.S. Information Services
Segment Reporting Information [Line Items]
Number of Disaggregated Revenue Segments within a Specific Reportable Segment	3
International
Segment Reporting Information [Line Items]
Number of Disaggregated Revenue Segments within a Specific Reportable Segment	2

Selected Financial Information

Selected Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 563.1	$ 474.8	$ 1,100.5	$ 929.7
Operating income	134.4	115.5	259.6	216.6
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(19)	(15.8)	(37.8)	(31.4)
Operating income	0	0	0	0
U.S. Information Services
Segment Reporting Information [Line Items]
Revenue	358.2	297.9	700.5	580.1
Operating income	95.7	83.7	178.6	156
U.S. Information Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(17.5)	(14.7)	(34.9)	(29.1)
Operating income	(17.1)	(14.3)	(34.2)	(28.4)
U.S. Information Services | Online Data Services [Member]
Segment Reporting Information [Line Items]
Revenue	234.9	190.6	463.2	373
U.S. Information Services | Marketing Services [Member]
Segment Reporting Information [Line Items]
Revenue	56.3	46.5	107.9	88.5
U.S. Information Services | Decision Services [Member]
Segment Reporting Information [Line Items]
Revenue	66.9	60.8	129.4	118.6
International
Segment Reporting Information [Line Items]
Revenue	106.3	87.3	202.3	170.7
Operating income	15.9	12.6	30	21.5
International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating income	(0.9)	(0.8)	(1.6)	(1.6)
International | Developed Markets [Member]
Segment Reporting Information [Line Items]
Revenue	43.2	31	74.5	59
International | Developed Markets [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(1.2)	(1.1)	(2.4)	(2.1)
International | Emerging Markets [Member]
Segment Reporting Information [Line Items]
Revenue	63.1	56.3	127.7	111.7
International | Emerging Markets [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(0.1)	0	(0.1)	(0.1)
Consumer Interactive
Segment Reporting Information [Line Items]
Revenue	117.6	105.4	235.5	210.3
Operating income	54.4	49.7	107.8	97.7
Consumer Interactive | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(0.2)	0	(0.3)	0
Operating income	17.9	15.1	35.7	30
Corporate
Segment Reporting Information [Line Items]
Operating income	(31.6)	(30.5)	(56.7)	(58.6)
Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating income	0	0	0	0
Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 582.1	$ 490.6	$ 1,138.2	$ 961.1

Reconciliation of Operating Inc

Reconciliation of Operating Income (Loss) to Income from Continuing Operations Before Income Tax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting [Abstract]
Operating income from segments	$ 134.4	$ 115.5	$ 259.6	$ 216.6
Non-operating income and expense	(61.3)	(23.4)	(83.5)	(48.5)
Income from continuing operations before income taxes	$ 73.1	$ 92.1	$ 176.1	$ 168.1

Earning from Equity Method Inve

Earning from Equity Method Investments Included in Non-Operating Income and Expense - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Earnings from equity method investments	$ 2.9	$ 2	$ 5.2	$ 3.7
U.S. Information Services
Segment Reporting Information [Line Items]
Earnings from equity method investments	0.6	0.5	1.3	0.8
International
Segment Reporting Information [Line Items]
Earnings from equity method investments	$ 2.3	$ 1.5	$ 3.9	$ 2.9