CDK Global (CDK) 10-K 14 Aug 18 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Jun. 30, 2018	Aug. 09, 2018	Dec. 29, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity well-known seasoned issuer	Yes
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Entity Registrant Name	CDK Global, Inc.
Entity Central Index Key	1,609,702
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Common Stock, Shares Outstanding		129,440,956
Public Float			$ 9.6

Consolidated and Combined State

Consolidated and Combined Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 2,273.2	$ 2,220.2	$ 2,114.6
Expenses:
Cost of revenues	1,182	1,234.9	1,243.4
Selling, general and administrative expenses	475.8	477.7	448.5
Restructuring expenses	20.9	18.4	20.2
Total expenses	1,678.7	1,731	1,712.1
Operating earnings	594.5	489.2	402.5
Interest expense	(95.9)	(57.2)	(40.2)
Other income, net	13.4	3.3	6.8
Earnings before income taxes	512	435.3	369.1
Provision for income taxes	(123.3)	(132.8)	(122.3)
Net earnings	388.7	302.5	246.8
Less: net earnings attributable to noncontrolling interest	7.9	6.9	7.5
Net earnings attributable to CDK	$ 380.8	$ 295.6	$ 239.3
Net earnings attributable to CDK per share:
Basic (in usd per share)	$ 2.80	$ 2.01	$ 1.52
Diluted (in usd per share)	$ 2.78	$ 1.99	$ 1.51
Weighted-average common shares outstanding:
Basic (shares)	135.8	146.7	157
Diluted (shares)	136.8	148.2	158

Consolidated and Combined Stat3

Consolidated and Combined Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 388.7	$ 302.5	$ 246.8
Other comprehensive income (loss):
Currency translation adjustments	3.5	2.2	(45.8)
Other comprehensive income (loss)	3.5	2.2	(45.8)
Comprehensive income	392.2	304.7	201
Less: comprehensive income attributable to noncontrolling interest	7.9	6.9	7.5
Comprehensive income attributable to CDK	$ 384.3	$ 297.8	$ 193.5

Consolidated Balance Sheets Sta

Consolidated Balance Sheets Statement - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Current assets:
Cash and cash equivalents	$ 804.4	$ 726.1
Accounts receivable, net of allowances of $7.4 and $6.3, respectively	374.6	372.1
Other current assets	188.3	180.6
Total current assets	1,367.3	1,278.8
Property, plant and equipment, net	131.9	135
Other assets	165.5	184.1
Goodwill	1,217.2	1,181.2
Intangible assets, net	126.5	104
Total assets	3,008.4	2,883.1
Current liabilities:
Current maturities of long-term debt and capital lease obligations	45.2	46.5
Accounts payable	50.5	38.9
Accrued expenses and other current liabilities	198	188.7
Accrued payroll and payroll-related expenses	85.7	106.2
Short-term deferred revenues	169	172.3
Total current liabilities	548.4	552.6
Long-term debt and capital lease obligations	2,575.5	2,125.2
Long-term deferred revenues	110.4	136.1
Deferred income taxes	56.7	65.9
Other liabilities	64.7	60.1
Total liabilities	3,355.7	2,939.9
Stockholders' Deficit:
Preferred stock, $0.01 par value: Authorized, 50.0 shares; issued and outstanding, none	0	0
Common stock, $0.01 par value: Authorized, 650.0 shares; issued, 160.3 and 160.3 shares, respectively; outstanding, 130.1 and 140.0 shares, respectively	1.6	1.6
Additional paid-in-capital	679.8	608.6
Retained earnings	753	452.7
Treasury stock, at cost: 30.2 and 20.3 shares, respectively	(1,810.7)	(1,144.7)
Accumulated other comprehensive income	11.5	8
Total CDK stockholders’ deficit	(364.8)	(73.8)
Noncontrolling interest	17.5	17
Total stockholder's deficit	(347.3)	(56.8)
Total liabilities and stockholders' deficit	$ 3,008.4	$ 2,883.1

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 7.4	$ 6.3
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	650,000,000	650,000,000
Common stock, shares issued	160,300,000	160,300,000
Common stock, shares outstanding	130,100,000	140,000,000
Treasury stock, shares	30,200,000	20,300,000

Consolidated and Combined Stat6

Consolidated and Combined Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net earnings	$ 388.7	$ 302.5	$ 246.8
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization	79.1	70.3	64
Deferred income taxes	(10.1)	20.9	(3.6)
Stock-based compensation expense	35.7	55.4	36.4
Other	5	4.6	(5.6)
Changes in operating assets and liabilities, net of effects of acquisitions:
Increase in accounts receivable	(2.8)	(8.3)	(57)
Decrease (increase) in other assets	7.9	(1.9)	3
Increase in accounts payable	11.8	4.4	15.3
(Decrease) increase in accrued expenses and other liabilities	(53.7)	(16.9)	20.8
Net cash flows provided by operating activities	461.6	431	320.1
Cash Flows from Investing Activities:
Capital expenditures	(46)	(62.4)	(50.8)
Proceeds from sale of property, plant and equipment	1.8	0.5	1.1
Capitalized software	(41.1)	(31.8)	(13.5)
Acquisitions of businesses, net of cash acquired	(29)	0	(18.1)
Contributions to investments	0	(2.1)	(10)
Proceeds from investments	0.8	7.9	9.7
Net cash flows used in investing activities	(113.5)	(87.9)	(81.6)
Cash Flows from Financing Activities:
Proceeds from long-term debt	500	1,000	250
Repayments of long-term debt and capital lease obligations	(46.4)	(36.9)	(20)
Dividends paid to stockholders	(80.1)	(80.7)	(82.3)
Repurchases of common stock	(623.6)	(700)	(561)
Proceeds from exercise of stock options	8.9	14.7	6.7
Excess tax benefit from stock-based compensation awards	0	0	8.9
Withholding tax payments for stock-based compensation awards	(10.6)	(12.2)	(8.7)
Dividend payments to noncontrolling owners	(7.4)	(6.3)	(5)
Payments of deferred financing costs	(7.9)	(10.6)	(2.1)
Acquisition-related payments	(4.1)	(8.1)	(6.2)
Recovery of dividends paid (Note 1D)	0	0	0.4
Net cash flows (used in) provided by financing activities	(271.2)	159.9	(419.3)
Effect of exchange rate changes on cash and cash equivalents	1.4	4	(8.3)
Net change in cash and cash equivalents	78.3	507	(189.1)
Cash and cash equivalents, beginning of period	726.1	219.1	408.2
Cash and cash equivalents, end of period	804.4	726.1	219.1
Supplemental Disclosure:
Income taxes and foreign withholding taxes, net of refunds	118.9	120.3	109.4
Interest	92.8	49.6	37.8
Non-cash consideration issued for acquisitions (Note 4)	$ 14.5	$ 0	$ 13.5

Consolidated and Combined Stat7

Consolidated and Combined Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income	Total CDK Stockholders' (Deficit)Equity	Non-controlling Interest
Beginning balance, shares at Jun. 30, 2015		161.3
Beginning balance at Jun. 30, 2015	$ 784.1	$ 1.6	$ 686.5	$ 81.2	$ (50.7)	$ 51.6	$ 770.2	$ 13.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	246.8			239.3			239.3	7.5
Foreign currency translation adjustments	(45.8)					(45.8)	(45.8)
Stock-based compensation expense	31.4		31.7	(0.3)			31.4
Common stock issued for the exercise and vesting of stock-based compensation awards, net, value	(2)		(32.6)		30.6		(2)
Excess tax benefit from stock-based compensation awards	8.9		8.9				8.9
Cash dividends paid to stockholders	(82.3)			(82.3)			(82.3)
Repurchases of common stock	(560.3)		(53.8)		(506.5)		(560.3)
Dividend payments to noncontrolling owners	(5)							(5)
Correction of common stock issued in connection with the spin-off and dividends paid	0.4	$ (1)		0.4			0.4
Ending balance, shares at Jun. 30, 2016		160.3
Ending balance at Jun. 30, 2016	376.2	$ 1.6	640.7	238.3	(526.6)	5.8	359.8	16.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	302.5			295.6		0	295.6	6.9
Foreign currency translation adjustments	2.2					2.2	2.2
Stock-based compensation expense	46.8		47.3	(0.5)			46.8
Common stock issued for the exercise and vesting of stock-based compensation awards, net, value	2.5		(45.1)		47.6		2.5
Cash dividends paid to stockholders	(80.7)			(80.7)			(80.7)
Repurchases of common stock	(700)		(34.3)		(665.7)		(700)
Dividend payments to noncontrolling owners	$ (6.3)							(6.3)
Correction of common stock issued in connection with the spin-off and dividends paid				0.4
Ending balance, shares at Jun. 30, 2017	160.3	160.3
Ending balance at Jun. 30, 2017	$ (56.8)	$ 1.6	608.6	452.7	(1,144.7)	8	(73.8)	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	388.7			380.8		0	380.8	7.9
Foreign currency translation adjustments	3.5					3.5	3.5
Stock-based compensation expense	30.1		30.5	(0.4)			30.1
Common stock issued for the exercise and vesting of stock-based compensation awards, net, value	(1.7)		(26.2)		24.5		(1.7)
Cash dividends paid to stockholders	(80.1)			(80.1)			(80.1)
Repurchases of common stock	(623.6)		66.9		(690.5)		(623.6)
Dividend payments to noncontrolling owners	$ (7.4)							(7.4)
Ending balance, shares at Jun. 30, 2018	160.3	160.3
Ending balance at Jun. 30, 2018	$ (347.3)	$ 1.6	$ 679.8	$ 753	$ (1,810.7)	$ 11.5	$ (364.8)	$ 17.5

Basis of Presentation

Basis of Presentation	12 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation A. Description of Business CDK Global, Inc (the "Company" or "CDK") enables end-to-end automotive commerce across the globe. For over 40 years, the Company has served automotive retailers and original equipment manufacturers ("OEMs") by providing innovative solutions that allow them to better connect, manage, analyze, and grow their businesses. The Company's solutions automate and integrate all parts of the buying process, including the advertising, acquisition, sale, financing, insuring, parts supply, repair, and maintenance of vehicles, in more than 100 countries around the world, for approximately 28,000 retail locations and most OEMs. The Company is organized into two main operating groups. The Company's first operating group is CDK North America which is comprised of two reportable segments, Retail Solutions North America ("RSNA") and Advertising North America ("ANA"). The second operating group, which is also a reportable segment, is CDK International ("CDKI"). In addition, the Company has an Other segment, the primary components of which are corporate allocations and other expenses not recorded in the segment results. Refer to Note 18 for further information. B. Basis of Preparation The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect assets, liabilities, revenues, and expenses that are reported in the accompanying financial statements and footnotes thereto. Actual results may differ from those estimates. C. Spin-off On April 9, 2014 , the board of directors of Automatic Data Processing, Inc. (“ADP”) approved the spin-off of the Dealer Services business of ADP. On September 30, 2014 , the spin-off became effective and ADP distributed 100% of the common stock of CDK to the holders of record of ADP's common stock as of September 24, 2014 (the "spin-off"). Concurrent with the spin-off, the Company and ADP entered into several agreements providing for transition services and governing relationships between the Company and ADP. Refer to Notes 8 and 17 for further information. D. Spin-off Common Stock Issued During the three months ended September 30, 2015, the Company became aware that 1.0 million shares of common stock were inadvertently issued and distributed to ADP at the spin-off with respect to certain unvested ADP equity awards. The Company previously reported that 160.6 million shares were issued in connection with the spin-off, which was overstated by 1.0 million shares. In addition, dividends paid to stockholders in fiscal 2015 were overstated by $0.4 million . The Company assessed the materiality and concluded that the impact was not material to previously reported results of operations, financial condition, or cash flows. During the three months ended September 30, 2015, the Company and ADP took corrective action to cancel the 1.0 million shares of common stock effective as of September 30, 2014 and the Company recovered the $0.4 million

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies A. Consolidation The financial statements include the accounts of the Company and its wholly owned subsidiaries. In addition, the financial statements include the accounts of Computerized Vehicle Registration ("CVR") in which CDK holds a controlling financial or management interest. Intercompany transactions and balances between consolidated CDK businesses have been eliminated. The Company's share of earnings or losses of non-controlled affiliates, over which the Company exercises significant influence (generally a 20% to 50% ownership interest), are included in the consolidated operating results using the equity method of accounting. Equity method investments were not significant for fiscal years ended June 30, 2018 ("fiscal 2018 "), June 30, 2017 ("fiscal 2017 "), and June 30, 2016 ("fiscal 2016 "). B. Business Combinations The purchase price allocations for acquisitions are based on estimates of the fair value of tangible and intangible assets acquired and liabilities assumed. The Company engages independent valuation specialists, when necessary, to assist with purchase price allocations and uses recognized valuation techniques, including the income and market approaches, to determine fair value. Management makes estimates and assumptions in determining purchase price allocations and valuation analyses, which may involve significant unobservable inputs. The excess of the purchase price over the estimated fair values of the underlying assets acquired and liabilities assumed is allocated to goodwill. In certain circumstances, the determination of the purchase price and allocation to assets acquired and liabilities assumed are based upon preliminary estimates and assumptions. Accordingly, the allocation may be subject to revision during the measurement period, which may be up to one year from the acquisition date, when the Company receives final information, including appraisals and other analyses. Measurement period adjustments are recorded to goodwill in the reporting period in which the adjustments to the provisional amounts are determined. Assets acquired and liabilities assumed in business combinations are recorded on the Company’s consolidated balance sheets as of the respective acquisition dates based upon their estimated fair values at such dates. The results of operations of businesses acquired by the Company are included in the Company’s consolidated statements of operations since their respective acquisition dates. C. Restructuring Restructuring expenses consist of employee-related costs, including severance and other termination benefits calculated based on long-standing benefit practices and local statutory requirements, and contract termination costs. Restructuring liabilities are recognized at fair value in the period the liability is incurred. In some jurisdictions, the Company has ongoing benefit arrangements under which the Company records the estimated severance and other termination benefits when such costs are deemed probable and estimable, approved by the appropriate corporate management, and if actions required to complete the termination plan indicate that it is unlikely that significant changes to the plan will be made or the plan will be withdrawn. In jurisdictions where there is not an ongoing benefit arrangement, the Company records estimated severance and other termination benefits when appropriate corporate management has committed to the plan and the benefit arrangement is communicated to the affected employees. A liability for costs to terminate a contract before the end of its term is recognized at fair value when the Company terminates the contract in accordance with its terms. Estimates are evaluated periodically to determine whether an adjustment is required. D. Revenue Recognition The Company recognizes software revenues in accordance with Accounting Standards Codification (“ASC”) 985-605, “Software - Revenue Recognition,” and non-software related revenue, including Software-as-a-Service (“SaaS”), in accordance with ASC 605, "Revenue Recognition" ("ASC 605"). The Company generates revenues from four categories: subscription, digital advertising, transactional services, and other. Taxes collected from customers and remitted to governmental authorities are presented on a net basis; that is, such taxes are excluded from revenues. Subscription. In the RSNA and CDKI segments, CDK provides software and technology solutions for automotive retailers and OEMs, which includes: • Dealer Management Systems (“DMSs”) and layered applications, where the software may be installed on-site at the customer’s location, or hosted and provided on a SaaS basis, including ongoing maintenance and support; • Interrelated services such as installation, initial training, and data updates; • Websites, search marketing, and reputation management services (RSNA only); and • Hardware on a service basis, meaning no specific assets are identified or a substantive right of substitution exists. Revenues for term licenses are recognized ratably over the software license term, as vendor-specific objective evidence of the fair values of the individual elements in the sales arrangement does not exist. Revenue recognition commences at the installation dates, when customer acceptance has occurred, and collectability of a determinable amount is probable. In the case of hosted applications, the customer does not have the contractual right to take possession of the software and the items delivered at the outset of the contract (e.g., installation, training, etc.) do not have value to the customer without the software license and ongoing support and maintenance. Any upfront fees charged in the case of hosted arrangements are recognized ratably over the expected benefit period of the arrangement, typically five years. The unrecognized portion of these revenue elements is recorded as deferred revenue. Advertising services. In the ANA segment, the Company receives revenues from the placement of internet advertising for automotive retailers and OEMs. Advertising revenues are recognized when the services are rendered. Transaction revenues . In the RSNA segment, the Company receives fees per transaction for providing auto retailers interfaces with third parties to process credit reports, vehicle registrations, and automotive equity mining. Revenue is recognized at the time the services are rendered. Transaction revenues are recorded in revenues gross of costs incurred when the Company is substantively and contractually responsible for providing the service, software, and/or connectivity to the customers, and therefore, bears the risks and benefits of the contractual arrangement. When the Company is acting as an agent in the transaction, revenue is recorded net of costs incurred. Other . The Company provides consulting and professional services and sells hardware such as laser printers, networking and telephony equipment, and related items. These revenues are recognized upon their delivery or service completion. E. Income Taxes Income tax expense is recognized for the amount of taxes payable or refundable for the current year. Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, and for operating losses and tax credit carryforwards. Management must make assumptions, judgments, and estimates to determine the provision for income taxes, taxes payable or refundable, and deferred tax assets and liabilities. The Company's assumptions, judgments, and estimates take into consideration the realization of deferred tax assets and changes in tax laws or interpretations thereof. The Company's income tax returns are subject to examination by various tax authorities. A change in the assessment of the outcomes of such matters could materially impact the Company's consolidated financial statements. The Company records a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized. In determining the need for a valuation allowance, the Company considers future market growth, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies. In the event the Company determines that it is more likely than not that an entity will be unable to realize all or a portion of its deferred tax assets in the future, the Company would increase the valuation allowance and recognize a corresponding charge to earnings in the period in which such a determination is made. Likewise, if the Company later determines that it is more likely than not that the deferred tax assets will be realized, the Company would reverse the applicable portion of the previously recognized valuation allowance. In order to realize deferred tax assets, the Company must be able to generate sufficient taxable income of the appropriate character in the jurisdictions in which the deferred tax assets are located. The Company recognizes tax benefits for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized upon ultimate settlement. Unrecognized tax benefits are tax benefits claimed in the Company's income tax returns that do not meet these recognition and measurement standards. Assumptions, judgments, and the use of estimates are required in determining whether the "more likely than not" standard has been met when developing the provision for income taxes. If certain pending tax matters settle within the next twelve months, the total amount of unrecognized tax benefits may increase or decrease for all open tax years and jurisdictions. Audit outcomes and the timing of audit settlements are subject to significant uncertainty. The Company continually assesses the likelihood and amount of potential adjustments and adjusts the income tax provision, the current taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known. The Company finalized its accounting policy decision with respect to global intangible low taxed income (“GILTI”) and elects to account for the GILTI tax as a period cost when incurred. The GILTI provision is effective beginning in fiscal year 2019 and therefore, will have an impact on future period annual effective tax rates. F. Stock-Based Compensation Certain of the Company's employees (a) have been granted stock options to purchase shares of the Company’s common stock and (b) have been granted restricted stock or restricted stock units under which shares of the Company's common stock vest based on the passage of time or achievement of performance and market conditions. The Company recognizes stock-based compensation expense in net earnings based on the fair value of the award on the date of the grant. The Company records the impact of forfeitures on stock compensation expense in the period the forfeitures occur. The Company determines the fair value of stock options issued using a binomial option-pricing model. The binomial option-pricing model considers a range of assumptions related to volatility, dividend yield, risk-free interest rate, and employee exercise behavior. Expected volatilities utilized in the binomial option pricing model are based on a combination of implied market volatilities and historical volatilities of peer companies. Similarly, the dividend yield is based on historical experience and expected future dividend payments. The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant. The binomial option pricing model also incorporates exercises based on an analysis of historical data. The expected life of a stock option grant is derived from the output of the binomial model and represents the period of time that options granted are expected to be outstanding. The grant date fair value of restricted stock and restricted stock units that vest upon achievement of service conditions is based on the closing price of the Company's common stock on the date of grant. The Company also grants performance-based awards that vest over a performance period. Certain performance-based awards are further subject to adjustment (increase or decrease) based on a market condition defined as total shareholder return of the Company’s common stock compared to a peer group of companies. The fair value of performance-based awards subject to a market condition is determined using a Monte Carlo simulation model. The principal variable assumptions utilized in determining the grant date fair value of performance-based awards subject to a market condition include the risk-free rate, stock volatility, dividend yield, and correlations between the Company's stock price and the stock prices of the peer group of companies. The probability associated with the achievement of performance conditions affects the vesting of our performance-based awards. Expense is only recognized for those shares expected to vest. The Company adjusts stock-based compensation expense (increase or decrease) when it becomes probable that actual performance will differ from the estimate. Upon adopting Accounting Standards Update (“ASU”) 2016-09 "Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-Based Payment Accounting," in fiscal 2017, we recognize forfeitures when they occur and no longer estimate a forfeiture rate to recognize stock-based compensation expense. G. Cash and Cash Equivalents Investment securities with an original maturity of three months or less at the time of purchase are considered cash equivalents. H. Accounts Receivable, Net Accounts receivable, net is comprised of trade receivables and lease receivables, net of allowances. Trade receivables consist of amounts due to the Company in the normal course of business, which are not collateralized and do not bear interest. Lease receivables primarily relate to sales-type leases arising from the sale of hardware elements in bundled DMS or other integrated solutions. Lease receivables represent the current portion of the present value of the minimum lease payments at the beginning of the lease term. The long-term portion of the present value of the minimum lease payments is included within other assets on the consolidated balance sheets. The Company considers lease receivables to be a single portfolio segment. The accounts receivable allowances for both trade receivables and lease receivables are estimated based on historical collection experience, an analysis of the age of outstanding accounts receivable, and credit issuance experience. Receivables are considered past due if payment is not received by the date agreed upon with the customer. Write-offs are made when management believes it is probable a receivable will not be recovered. I. Deferred Costs Costs to deliver services are expensed to cost of revenues as incurred with the exception of specific costs directly related to transition or installation activities, including payroll-related costs for the Company's implementation and training teams, as well as commission costs for the sale. These costs are deferred and expensed proportionately over the same period that deferred revenues are recognized as revenues. Deferred amounts are monitored regularly to ensure appropriate asset and expense recognition. Current deferred costs classified within other current assets on the consolidated balance sheets were $89.2 million and $94.4 million as of June 30, 2018 and 2017 , respectively. Long-term deferred costs classified within other assets on the consolidated balance sheets were $95.7 million and $115.0 million as of June 30, 2018 and 2017 , respectively. J. Funds Receivable and Funds Held for Clients and Client Fund Obligations Funds receivable and funds held for clients represent amounts received or expected to be received from clients in advance of performing titling and registration services on behalf of those clients. These amounts are classified within other current assets on the consolidated balance sheets. The total amount due to remit for titling and registration obligations with the department of motor vehicles is recorded to client fund obligations which is classified as accrued expenses and other current liabilities on the consolidated balance sheets. Funds receivable was $33.1 million and $25.7 million , and funds held for clients was $12.7 million and $7.9 million as of June 30, 2018 and 2017 , respectively. Client fund obligation was $45.8 million and $33.6 million as of June 30, 2018 and 2017 , respectively. K. Property, Plant and Equipment, Net Property, plant and equipment, net is stated at cost and depreciated over the estimated useful lives of the assets using the straight-line method. Leasehold improvements are amortized over the shorter of the term of the lease or the estimated useful lives of the improvements. The estimated useful lives of assets are primarily as follows: Buildings 20 to 40 years Furniture and fixtures 4 to 7 years Data processing equipment 2 to 5 years L. Goodwill The Company tests goodwill for impairment annually and whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company tests goodwill for impairment at the reporting unit level. A reporting unit is an operating segment or a component of an operating segment. The Company tests impairment by first comparing the fair value of each reporting unit to its carrying amount. If the carrying value for a reporting unit exceeds its fair value, the Company then compares the implied fair value of the Company's goodwill to the carrying amount in order to determine the amount of the impairment, if any. The Company estimates the fair value of the Company's reporting units by weighting the results from the income approach, which is the present value of expected cash flows discounted at a risk-adjusted weighted-average cost of capital, and the market approach, which uses market multiples of companies in similar lines of business. These valuation approaches require significant judgment and consider a number of factors including assumptions about the future growth and profitability of the Company's reporting units, the determination of appropriate comparable publicly traded companies in the Company's industry, discount rates, and terminal growth rates. An adverse change to the fair value of our reporting units could result in an impairment charge which could be material to our consolidated earnings. M. Impairment of Long-Lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset group to estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized for the amount by which the carrying amount exceeds the fair value. N. Internal Use Software The Company’s policy provides for the capitalization of external direct costs of materials and services associated with developing or obtaining internal use computer software. In addition, the Company’s policy also provides for the capitalization of certain payroll and payroll-related costs for employees who are directly associated with the internal use computer software projects. The amount of capitalizable payroll costs with respect to these employees is limited to the time directly spent on such projects. Costs associated with preliminary project stage activities, training, maintenance, and all other post-implementation stage activities are expensed as incurred. The Company also expenses internal costs related to minor upgrades and enhancements, as it is impracticable to separate these costs from normal maintenance activities. The Company amortizes internal use software typically over a three to five year life. O. Computer Software to be Sold, Leased, or Otherwise Marketed The Company’s policy provides for the capitalization of certain costs of computer software to be sold, leased, or otherwise marketed. The Company’s policy provides for the capitalization of all software production costs upon reaching technological feasibility for a specific product. Technological feasibility is attained when software products have a completed working model whose consistency with the overall product design has been confirmed by testing. Costs incurred prior to the establishment of technological feasibility are expensed as incurred. The establishment of technological feasibility requires judgment by management and in many instances is only attained a short time prior to the general release of the software. Maintenance-related costs are expensed as incurred. Pursuant to this policy, the Company incurred expenses to research, develop, and deploy new and enhanced solutions of $131.3 million , $150.0 million , and $161.0 million for fiscal 2018 , 2017 , and 2016 , respectively. These expenses were classified within cost of revenues on the consolidated statements of operations. Additionally, we had cash flows used for qualifying capitalized software development cost of $41.1 million , $31.8 million , and $13.5 million in fiscal 2018 , 2017 , and 2016 , respectively. P. Foreign Currency For foreign subsidiaries where the local currency is the functional currency, net assets are translated into U.S. dollars based on exchange rates in effect for each period, and revenues and expenses are translated at average exchange rates in the periods. Gains or losses from balance sheet translation of such entities are included in accumulated other comprehensive income on the consolidated balance sheets. Currency transaction gains or losses relate to intercompany loans denominated in a currency other than that of the loan counterparty, which do not eliminate upon consolidation. Currency transaction gains or losses are included within other income, net on the consolidated statements of operations. Q. Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. A fair value hierarchy has been established based on three levels of inputs, of which the first two are considered observable and the last unobservable. • Level 1: Inputs that are based upon quoted prices in active markets for identical assets or liabilities. • Level 2: Inputs, other than quoted prices included within Level 1, which are observable for the asset or liability, either directly or indirectly. • Level 3: Unobservable inputs where there is little or no market activity for the asset or liability. These inputs reflect management's best estimate of what market participants would use to price the assets or liabilities at the measurement date. The Company determines the fair value of financial instruments in accordance with ASC 820, "Fair Value Measurements." This standard defines fair value and establishes a framework for measuring fair value in accordance with GAAP. Cash and cash equivalents, accounts receivable, other current assets, accounts payable, and other current liabilities are reflected in the consolidated balance sheets at cost, which approximates fair value due to the short-term nature of these instruments. The carrying value of the Company's term loan facilities (as described in Note 13), including accrued interest, approximates fair value based on the Company's current estimated incremental borrowing rate for similar types of arrangements. The approximate aggregate fair value of the Company's senior notes as of June 30, 2018 and 2017 was $1,849.3 million and $1,407.9 million , respectively, based on quoted market prices for the same or similar instruments compared to a carrying value of $1,850.0 million and $1,350.0 million as of June 30, 2018 and 2017 . The term loan facilities and the senior notes are considered Level 2 fair value measurements in the fair value hierarchy. T he Company has derivatives not designated as hedges which consisted of foreign currency forward contracts to offset the risks associated with the effects of certain foreign currency exposure on intercompany loans. The Company recognized changes in fair value of the derivative instruments in Other income, net in the consolidated statements of operations. R. Concentrations The C ompany maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company maintains deposits in a diversified group of financial institutions, has not experienced any losses to date, and monitors the credit ratings of the primary depository institutions where deposits reside. For fiscal 2018 , 2017 and 2016 , revenues to one customer represented approximately 9% , 11% and 11% , respectively, of the Company's revenues. Accounts receivable from this customer represented approximately 11% and 14% of the Company's accounts receivable as of June 30, 2018 and 2017

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements Recently Issued Accounting Pronouncements In January 2017, the Financial Accounting Standard Board (“FASB”) issued ASU 2017-04, “Intangibles - Goodwill and Other.” ASU 2017-04 simplifies the accounting for goodwill impairment by eliminating Step 2 of the current goodwill impairment test, which required a hypothetical purchase price allocation. Goodwill impairment will now be the amount by which the reporting unit’s carrying value exceeds its fair value, limited to the carrying value of the goodwill. ASU 2017-04 is effective for financial statements issued for fiscal years, and interim periods beginning after December 15, 2019. The adoption of ASU 2017-04 is not expected to have a material impact on the Company's consolidated results of operations, financial condition, or cash flows. In November 2016, the FASB issued ASU 2016-18, “Restricted Cash.” ASU 2016-18 clarifies cash flow presentation for restricted cash. ASU 2016-18 is effective for financial statements issued for fiscal years, and interim periods beginning after December 15, 2017. The adoption of ASU 2016-18 will not have a material impact on the Company's consolidated statements of cash flows. In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments (Topic 230).” ASU 2016-15 addresses eight specific cash flow issues where there is diversity in practice in how these certain cash receipts and cash payments are presented and classified in the statements of cash flows. ASU 2016-15 is effective for financial statements issued for fiscal years, and interim periods beginning after December 15, 2017. The adoption of ASU 2016-15 will not have a material impact on the Company's consolidated statements of cash flows. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 requires that lessees recognize right-of-use assets and lease liabilities for any lease classified as either a finance or operating lease that is not considered short-term. The accounting applied by lessors is largely consistent with the existing lease standard. ASU 2016-02 is effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2018 and required companies to apply a modified retrospective transition as of the earliest period presented. In July 2018, the FASB issued ASU 2018-11, “Lease (Topic 842), Targeted Improvements,” which permits companies to apply a modified retrospective transition as of the effective date and provide comparative period disclosures under ASC Topic 840. The Company has obligations under lease agreements for facilities, equipment and vehicles, which are classified as operating leases under the existing lease standard. While the Company is still evaluating the impact that ASU 2016-02 will have on the consolidated results of operations, financial condition, or cash flows, the Company's financial statements will reflect an increase in both assets and liabilities due to the requirement to recognize right-of-use assets and lease liabilities on the consolidated balance sheets for its facility and equipment leases. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 requires an entity to recognize revenue depicting the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 will also result in enhanced revenue related disclosures. The guidance permits two methods of adoption: 1) retrospectively to each prior reporting period presented (full retrospective), or 2) retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective). In July 2015, the FASB deferred the effective date of ASU 2014-09 by one year and subsequently issued ASU 2015-14, "Revenue from Contracts with Customers (ASC 606): Deferral of the Effective Date." As a result, the standard and subsequent amendments thereto, will be effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2017. During fiscal 2017, the Company established a cross-functional implementation team which evaluated the impact of the new standard on its revenue contracts. The Company will adopt this standard on a modified retrospective basis, on July 1, 2018. The Company expects the most significant impacts of adopting ASU 2014-09, and the related ASUs, on its consolidated results of operations, financial condition, or cash flows, will be as follows: • The Company currently applies accounting guidance for software, ASC 985-605, and recognizes revenues for on-site licenses ratably over the software license term, as CDK lacks vendor-specific objective evidence ("VSOE") of the fair values of the individual elements of the sales arrangement. Under ASC 606, the Company will no longer be required to establish VSOE and will allocate an arrangement's transaction price to on-site software licenses, based on estimated standalone selling price at the time of the sale. Therefore, upon adoption of the standard, the Company will recognize revenue and costs for on-site licenses upon installation of the software. Aside from revenues for on-site software licenses, the Company will continue to recognize the majority of its revenues, including SaaS and other service arrangements ratably over the term of arrangement and transaction revenue when service is rendered. • In ASC 340, "Other Assets and Deferred Costs", the FASB provides guidance for contract costs that require capitalization and subsequent amortization - costs to obtain a customer contract, and costs to fulfill the contract, which for CDK consists primarily of direct sales commissions and implementation costs of service arrangements. The adoption of the new standard will result in an increase in the costs deferred and amortized over the economic life of the contract. The Company is in the process of finalizing the impact of adoption of this standard on its financial statements and currently anticipates at the date of adoption a pre-tax cumulative adjustment increasing retained earnings, primarily as a result of the two items discussed above, of approximately $150 million to $180 million , with a corresponding decrease in deferred revenues and increase in unbilled receivables due to timing of revenue recognition for on-site software and a slight increase in deferred costs due to costs capitalized under ASC 340 partially offset by costs related to on-site software installations prior to the date of adoption. Implications to tax related accounts are not included in these estimated amounts. The Company’s assessment of the full impact of adoption of the standard is subject to finalization, such that the actual impact of the adoption may differ from the estimated range described above.

Acquisitions

Acquisitions	12 Months Ended
	Jun. 30, 2018
Business Combinations And Divestiture [Abstract]
Acquisitions and Divestiture	Acquisitions For the years ended June 30, 2018 and 2017 , the Company incurred $15.7 million and $0.7 million of costs related to the assessment and integration of acquisitions which are included in selling, general and administrative expenses, respectively. ELEAD1ONE In July 2018, CDK announced that it had entered into a definitive agreement to acquire ELEAD1ONE. ELEAD1ONE provides automotive customer relationship management software and call center solutions that enable interaction between sales, service and marketing operations to provide dealers with an integrated customer acquisition and retention platform. The transaction was unanimously approved by the CDK Board of Directors and is currently pending regulatory approval. Progressus Media LLC On April 3, 2018, the Company acquired the membership interests of Progressus Media LLC ("Progressus"), a specialty provider of mobile advertising solutions for dealerships, agencies, and automotive marketing companies. The acquisition was made pursuant to a membership interest purchase agreement, which contains customary representations, warranties, covenants, and indemnities by the sellers and the Company. The acquisition date fair value of the total consideration transferred was $22.2 million which consists primarily of an initial cash price of $16.2 million , net of cash acquired, the fair value of the holdback provision of $0.3 million and the fair value of contingent consideration of $5.7 million , which is payable upon achievement of certain milestones and metrics over a three year period ending on March 31, 2021. Prior to the acquisition, a CDK officer had an existing advisory relationship with Progressus which entitled the individual to a portion of the proceeds from a sale of Progressus under a unit appreciation rights agreement. At the time of closing, $0.5 million of the total consideration transferred by CDK was paid to the officer to settle Progressus’ obligation under the terms of the officer’s unit appreciation rights agreement. The fair value of acquired intangibles assets and other net assets was $8.7 million and $2.2 million , respectively. The excess of the acquisition consideration over the estimated fair value of the acquired net assets of $11.3 million was allocated to goodwill. The acquired net assets and goodwill are included in the ANA segment. The intangible assets will be amortized over a weighted-average useful life of approximately 9 years. The goodwill recognized from this acquisition reflects expected synergies resulting from direct ownership of the products and processes, allowing greater flexibility for future product development. The acquired goodwill is deductible for tax purposes. As of June 30, 2018 , the Company recorded $1.6 million of accrued expenses and other current liabilities and $4.4 million of other liabilities for the holdback and contingent consideration. The contingent consideration payments will be classified as financing activities on the statement of cash flows as the payments will occur more than three months after the acquisition date. The fair values of intangible assets and the contingent consideration liability were based on preliminary valuation analysis. These estimates and assumptions are subject to change within the one-year measurement period if additional information, which existed as of the acquisition date, becomes known to the Company. Dashboard Dealership Enterprises On October 20, 2017, the Company acquired the outstanding stock of Dashboard Dealership Enterprises, a provider of executive reporting solutions for auto dealers. The acquisition was made pursuant to a stock purchase agreement, which contains customary representations, warranties, covenants, and indemnities by the sellers and the Company. The acquisition date fair value of total consideration to be transferred was $21.3 million , which consists primarily of an initial cash price of $12.8 million , the fair value of the holdback provision of $1.9 million , and the fair value of contingent consideration of $6.6 million , which is payable upon achievement of certain milestones and metrics if achieved by December 31, 2018. As of June 30, 2018 , the Company recorded $7.6 million of accrued expenses and other current liabilities and $0.9 million of other liabilities for the holdback and contingent consideration. The fair value of acquired intangibles assets and liabilities assumed, including deferred tax liabilities, was $3.9 million and $1.6 million , respectively. The excess of the acquisition consideration over the estimated fair value of the acquired assets of $19.0 million was allocated to goodwill. The acquired assets and goodwill are included in the RSNA segment. The intangible assets will be amortized over a weighted-average useful life of approximately 8 years. The goodwill recognized from this acquisition reflects expected synergies resulting from direct ownership of the products and processes, allowing greater flexibility for future product development. The acquired goodwill is not deductible for tax purposes. The pro forma effects of these acquisitions are not significant to the Company's reported results for any period presented. Accordingly, no pro forma financial statements have been presented herein. Auto/Mate Dealership Systems In May 2017, the Company entered into a definitive agreement to acquire Auto/Mate Dealership Systems, a privately held company that provides a suite of DMS products and solutions. In the third quarter of fiscal 2018, the Company and Auto/Mate Dealership Systems terminated the agreement. This outcome followed the decision of the Federal Trade Commission to oppose the proposed acquisition. There was no termination fee. RedBumper, LLC and NewCarIQ, LLC On February 1, 2016, the Company acquired certain assets of RedBumper, LLC and NewCarIQ, LLC, providers of technology solutions for new and used car pricing. The Company had a pre-existing relationship with these entities under which CDK was a reseller of their products. The acquisitions were made pursuant to asset purchase agreements, which contain customary representations, warranties, covenants, and indemnities by the sellers and the Company. The acquisition date fair value of total consideration to be transferred was $32.4 million , which consists primarily of an initial cash price of $17.7 million and a liability for contingent consideration of $14.3 million . Contingent consideration payments occurring within three months following the acquisition date were classified within investing activities on the statement of cash flows; subsequent payments were included within financing activities. Accordingly, $0.4 million of contingent consideration payments made during the three months following the acquisition date were included in investing activities as cash paid for the acquisitions. The minimum contingent consideration payable under the asset purchase agreements is $14.7 million and is payable in installments over a four -year period; there is no maximum payment amount. The Company funded the initial payment with cash on hand. The fair value of acquired software intangible assets and other assets was $15.0 million and $0.6 million , respectively. The excess of the acquisition consideration over the fair value of the acquired assets of $16.8 million was allocated to goodwill. The acquired assets and goodwill are included in the RSNA segment. The software intangible assets will be amortized over a weighted-average useful life of 8

Restructuring

Restructuring	12 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring During the fiscal year ended June 30, 2015, the Company initiated a three -year business transformation plan intended to increase operating efficiency and improve the Company's cost structure within its global operations. The business transformation plan is expected to produce significant benefits in the Company's long-term business performance. As the Company executes the business transformation plan, the Company continually monitors, evaluates and refines its structure, including its design, goals, term and estimate of total restructuring expenses. As part of this process, during fiscal 2017, the Company extended the business transformation plan by one year through the fiscal year ending June 30, 2019 ("fiscal 2019"), and updated its estimate of total restructuring expenses under the business transformation plan to approximately $70.0 million through fiscal 2019. Based on additional opportunities we identified to further improve our cost structure, we have increased the estimated cost to execute the plan through fiscal 2019 to be approximately $100.0 million . Restructuring expenses associated with the business transformation plan included employee-related costs, which represent severance and other termination-related benefits calculated based on long-standing benefit practices and local statutory requirements, and contract termination costs, which include costs to terminate facility leases. The Company recognized $20.9 million , $18.4 million , and $20.2 million of restructuring expenses for fiscal 2018 , 2017 and 2016 , respectively. Since the inception of the business transformation plan in fiscal 2015, the Company has recognized cumulative restructuring expenses of $61.9 million . Restructuring expenses are presented separately on the consolidated statements of operations. Restructuring expenses are recorded in the Other segment, as these initiatives are predominantly centrally directed and are not included in internal measures of segment operating performance. Accruals for restructuring expenses were included within accrued expenses and other current liabilities on the consolidated balance sheets as of June 30, 2018 and 2017 . The following table summarizes the fiscal 2018 and 2017 activity for the restructuring accrual: Employee-Related Costs Contract Termination Costs Total Balance as of June 30, 2016 $ 9.0 $ 0.9 $ 9.9 Charges 14.5 4.8 19.3 Cash payments (16.5 ) (3.0 ) (19.5 ) Adjustments (0.6 ) (0.3 ) (0.9 ) Balance as of June 30, 2017 6.4 2.4 8.8 Charges 20.8 1.8 22.6 Cash payments (21.5 ) (3.0 ) (24.5 ) Adjustments (1.3 ) (0.4 ) (1.7 ) Balance as of June 30, 2018 $ 4.4 $ 0.8 $ 5.2

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Incentive Equity Awards Converted from ADP Awards On October 1, 2014, ADP's outstanding equity awards for employees of the Company were converted into equity awards of CDK at a ratio of 2.757 CDK equity awards for every ADP equity award held immediately prior to the spin-off. The converted equity awards have the same terms and conditions as the ADP equity awards. As a result, the Company issued 2.3 million stock options with a weighted-average exercise price of $19.64 , 0.7 million time-based restricted shares, and 0.2 million performance-based restricted shares upon completion of the conversion of existing ADP equity awards into the Company's equity awards. As the conversion was considered a modification of an award in accordance with ASC 718, "Compensation - Stock Compensation," the Company compared the fair value of the award immediately prior to the spin-off to the fair value immediately after the spin-off to measure the incremental compensation cost. The fair values immediately prior to and after the spin-off were estimated using a binomial option-pricing model. The conversion resulted in an increase in the fair value of the awards by $1.4 million , which was recognized in full as of June 30, 2016. Incentive Equity Awards Granted by the Company The 2014 Omnibus Award Plan ("2014 Plan") provides for the granting of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, other stock-based awards, and performance compensation awards to employees, directors, officers, consultants, advisors, and those of the Company's affiliates. The 2014 Plan provides for an aggregate of 12.0 million shares of the Company's common stock to be reserved for issuance and is effective for a period of ten years . As of June 30, 2018 , there were 5.3 million shares available for issuance under the 2014 Plan after considering awards granted by the Company and converted as a result of the spin-off from ADP. In fiscal 2016, the Company began reissuing treasury stock to satisfy issuances of common stock upon option exercise or vesting. Prior to the spin-off, all employee equity awards (stock options and restricted stock) were granted by ADP. All subsequent awards, including all incentive equity awards converted from ADP awards, were granted under the 2014 Plan. The Company recognizes stock-based compensation expense associated with employee equity awards in net earnings based on the fair value of the awards on the date of grant. Effective July 1, 2016, the Company adopted ASU 2016-09 "Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-Based Payment Accounting." Upon adoption, the Company made an accounting policy election to account for forfeitures as they occur rather than apply an estimated forfeiture rate. Stock-based compensation primarily consisted of the following: Stock Options: Stock options are granted to employees at exercise prices equal to the fair market value of the Company's common stock on the date of grant. Stock options are issued under a graded vesting schedule with a term of ten years . Compensation expense is measured based on the fair value of the stock option on the grant date and recognized over the requisite service period for each separately vesting portion of the stock option award. Upon termination of employment, unvested stock options are evaluated for forfeiture or modification, subject to the terms of the awards and Company policies. Time-Based Restricted Stock and Time-Based Restricted Stock Units. Time-based restricted stock and restricted stock units generally vest over a two - to five -year period. Upon termination of employment, unvested awards are evaluated for forfeiture or modification, subject to the terms of the awards and Company policies. Time-based restricted stock cannot be transferred during the vesting period. Compensation expense related to the issuance of time-based restricted stock is measured based on the fair value of the award on the grant date and recognized on a straight-line basis over the vesting period. Employees are eligible to receive dividends on the shares awarded under the time-based restricted stock program during the restricted period. Time-based restricted stock units are primarily settled in cash, but may also be settled in stock. Compensation expense related to the issuance of time-based restricted stock units is recorded over the vesting period, and is initially based on the fair value of the award on the grant date. Cash settled, time-based restricted stock units are subsequently remeasured at each reporting date during the vesting period to the current stock value. No dividend equivalents are paid on units awarded under the time-based restricted stock unit program during the restricted period. Performance-Based Restricted Stock Units. Performance-based restricted stock units generally vest over a three -year performance period. Under these programs, the Company communicates "target awards" at the beginning of the performance period with possible payouts at the end of the performance period ranging from 0% to 250% of the "target awards." Certain performance-based awards are further subject to adjustment (increase or decrease) based on a market condition defined as total shareholder return of the Company's common stock compared to a peer group of companies. The probability associated with the achievement of performance conditions affects the vesting of the Company's performance-based awards. Expense is only recognized for those shares expected to vest. Upon termination of employment, unvested awards are evaluated for forfeiture or modification, subject to the terms of the awards and Company policies. Performance-based restricted stock units are settled in either cash or stock, depending on the employee’s home country, and cannot be transferred during the vesting period. Compensation expense related to the issuance of performance-based restricted stock units settled in cash is recorded over the vesting period, is initially based on the fair value of the award on the grant date, and is subsequently remeasured at each reporting date to the current stock value during the performance period, based upon the probability that the performance target will be met. Compensation expense related to the issuance of performance-based restricted stock units settled in stock is recorded over the vesting period based on the fair value of the award on the grant date. Prior to settlement, dividend equivalents are earned on "target awards" under the performance-based restricted stock unit program. The following table represents stock-based compensation expense and the related income tax benefits for fiscal 2018 , 2017 , and 2016 , respectively: June 30, 2018 2017 2016 Cost of revenues $ 4.9 $ 6.3 $ 6.2 Selling, general and administrative expenses 30.8 49.1 30.2 Total pre-tax stock-based compensation expense $ 35.7 $ 55.4 $ 36.4 Income tax benefit $ 10.5 $ 19.4 $ 12.9 Stock-based compensation expense for fiscal 2018 consisted of $30.1 million of expense related to equity-classified awards and $5.6 million of expense related to liability-classified awards. This includes $1.5 million of incremental stock-based compensation expense for awards that were modified or expense recognition was accelerated related to an officer's departure for fiscal 2018 . Stock-based compensation expense for fiscal 2017 consisted of $46.8 million of expense related to equity-classified awards and $8.6 million of expense related to liability-classified awards. Stock-based compensation expense for fiscal 2017 includes $11.9 million of expense due to a cumulative adjustment in the fourth quarter based on management's assessment that it is probable CDK's performance metrics for fiscal 2018 associated with performance-based restricted stock units will exceed the target. Additionally, there was $3.1 million of incremental stock-based compensation expense for awards that were modified or expense recognition was accelerated related to an officer's departure in fiscal 2017. Stock-based compensation expense for fiscal 2016 consisted of $31.4 million of expense related to equity-classified awards, $5.0 million of expense related to liability-classified awards. Stock-based compensation expense for fiscal 2016 includes $3.5 million of incremental stock-based compensation expense for awards that were modified or expense recognition was accelerated related to the Transition and Release Agreement entered into with Mr. Anenen on February 2, 2016. As of June 30, 2018 , the total unrecognized compensation cost related to non-vested stock options, restricted stock units, and restricted stock awards was $1.7 million , $16.7 million , and $8.0 million , respectively, which will be amortized over the weighted-average remaining requisite service periods of 1.8 years , 1.6 years , and 1.2 years , respectively. The activity related to the Company's incentive equity awards for fiscal 2018 consisted of the following: Stock Options Number of Options (in thousands) Weighted-Average Exercise Price (in dollars) Weighted-Average Remaining Contractual Life (in years) Aggregate Intrinsic Value (in millions) Options outstanding as of June 30, 2017 1,310 $ 39.70 Options granted 25 62.03 Options exercised (334 ) 26.77 Options canceled (44 ) 51.77 Options outstanding as of June 30, 2018 957 $ 44.25 6.7 $ 19.9 Exercisable as of June 30, 2018 532 $ 34.55 5.6 $ 16.2 The Company received proceeds from the exercise of stock options of $8.9 million , $14.7 million , and $6.7 million during fiscal 2018 , 2017 , and 2016 respectively. The aggregate intrinsic value of stock options exercised during fiscal 2018 , 2017 , and 2016 was approximately $14.0 million , $26.0 million , and $12.4 million , respectively. Time-Based Restricted Stock and Time-Based Restricted Stock Units Restricted Stock Restricted Stock Units Number of Shares (in thousands) Weighted-Average Grant Date Fair Value (in dollars) Number of Units (in thousands) Weighted-Average Grant Date Fair Value (in dollars) Non-vested restricted shares/units as of June 30, 2017 497 $ 53.98 214 $ 66.17 Restricted shares/units granted 184 63.71 79 64.86 Restricted shares/units vested (230 ) 50.23 (138 ) 50.12 Restricted shares/units forfeited (72 ) 58.66 (13 ) 58.65 Non-vested restricted shares/units as of June 30, 2018 379 $ 60.14 142 $ 58.55 Performance-Based Restricted Stock Units Restricted Stock Units Number of Units (in thousands) Weighted-Average Grant Date Fair Value (in dollars) Non-vested restricted units as of June 30, 2017 742 $ 65.41 Restricted units granted 236 52.36 Dividend equivalents 7 57.53 Restricted units vested (513 ) 50.38 Restricted units forfeited (61 ) 59.33 Non-vested restricted units as of June 30, 2018 411 $ 63.26 The following table presents the assumptions used to determine the fair value of the stock options granted by the Company: Fiscal 2018 Fiscal 2017 Fiscal 2016 Risk-free interest rate 2.0 % 1.4 % 1.8 % Dividend yield 0.9 % 0.9 % 0.9 % Weighted-average volatility factor 24.5 % 24.5 % 24.7 % Weighted-average expected life (in years) 6.3 6.3 6.3 Weighted-average fair value (in dollars) $ 15.65 $ 13.90 $ 12.55

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Defined Contribution Savings Plan. The Company's Board of Directors approved a CDK-sponsored defined contribution plan covering eligible full-time domestic employees of the Company after the spin-off date. This plan provides company matching contributions on a portion of employee contributions. In addition, this plan includes a transitional contribution for certain employees who were previously eligible to participate under ADP's domestic defined benefit plan since the Company did not adopt a similar plan. The costs recorded by the Company for this plan were $16.9 million , $18.7 million and $18.9 million for fiscal 2018 , 2017 and 2016 , respectively. International Benefit Plans. The Company’s foreign subsidiaries have benefit plans that cover certain international employees. To the extent required by local statutory laws, the Company funds these benefit plans through periodic contributions under statutorily prescribed formulas. The Company’s expense for these plans was approximately $15.8 million , $14.8 million , and $14.1 million for fiscal 2018 , 2017 , and 2016

Income Taxes

Income Taxes	12 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Tax Cuts and Jobs Act of 2017 On December 22, 2017, the Tax Cuts and Jobs Act ("Tax Reform Act") was enacted into law. The Tax Reform Act significantly revises the U.S. corporate income tax laws by, among other things, reducing the corporate income tax rate from 35.0% to 21.0% and implementing a modified territorial tax system that includes a one-time transition tax on accumulated undistributed foreign earnings. Other provisions included in the Tax Reform Act include the broadening of the executive compensation deduction limitation, a repeal of the domestic production activity deduction and several new international provisions. The modified territorial tax system includes a new anti-deferral provision, referred to as global intangible low taxed income (“GILTI”), which subjects certain foreign income to current U.S. tax. In December 2017 , the Securities and Exchange Commission (“SEC”) issued Staff Accounting Bulletin No. 118, “Income Tax Accounting Implications of the Tax Cuts and Jobs Act” (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Reform Act. Under SAB 118, companies are able to record a reasonable estimate of the impacts of the Tax Reform Act if one is able to be determined and report it as a provisional amount during the measurement period. The measurement period is not to extend beyond one year from the enactment date. Impacts of the Tax Reform Act that a company is not able to make a reasonable estimate for should not be recorded until a reasonable estimate can be made during the measurement period. On a year-to-date basis, the Company recorded a one-time tax benefit of $18.5 million related to the Tax Reform Act comprised of $26.2 million for the re-measurement of the Company's net deferred tax liability, partially offset by tax expense of $3.4 million for the one-time transition tax recorded within accrued liabilities and $4.3 million for foreign withholding taxes associated with undistributed foreign earnings recorded primarily within deferred taxes. The year-to-date adjustment was made up of: a net $14.1 million provisional tax benefit for the one-time impacts of the Tax Reform Act recorded during the three months ended December 31, 2017; a measurement period adjustment of $0.8 million of tax benefit as a result of re-measuring the net deferred tax liability upon filing the income tax return recorded during the three months ended March 31, 2018; a measurement period adjustment recorded during the three months ended June 30, 2018 of $3.6 million of tax benefit consisting of $2.8 million to re-measure the net deferred tax liability based on finalized temporary differences and $0.8 million to revise the one-time transition tax and foreign withholding taxes based on revised earnings and profits computations completed during the period. As of June 30, 2018 , the Company considers its accounting for the Tax Reform Act to be complete. In addition to the one-time tax effects of the Tax Reform Act, the Company revised its annual effective tax rate to consider the impact of the reduced corporate tax rate. Due to the Company's fiscal year, the statutory corporate tax rate for fiscal 2018 is 28.1% , representing a blended tax rate based on the tax rate in effect on a pro-rata basis. The Company’s accounting policy election related to GILTI was incomplete as of December 31, 2017 and March 31, 2018 . During the three months ended June 30, 2018 , as a result of additional analysis and evaluation, the Company elected to account for the GILTI tax as a period cost when incurred. The GILTI provision is effective beginning in fiscal year 2019 and therefore, will have an impact on future period annual effective tax rates. The ultimate impact of the Tax Reform Act may differ from the Company's estimates due to the issuance of additional regulatory guidance, the interpretation of the Tax Reform Act evolving over time and actions taken by the Company as a result of the Tax Reform Act. Tax Matters Agreement The Company and ADP entered into a tax matters agreement as part of the spin-off that governs the rights and obligations of both parties after the spin-off with respect to taxes for both pre and post spin-off periods. Under this agreement, ADP is generally required to indemnify the Company for any income taxes attributable to ADP's operations or the Company's operations and for any non-income taxes attributable to ADP's operations, in each case for all pre spin-off periods as well as any taxes arising from transactions effected to consummate the spin-off, and the Company generally is required to indemnify ADP for any non-income taxes attributable to the Company's operations for all pre spin-off periods and for any income taxes attributable to the Company's operations for post spin-off periods. The Company is generally required to indemnify ADP against any tax resulting from the spin-off (and against any claims made against ADP in respect of any tax imposed on its stockholders), in each case if that tax results from (i) an issuance of a significant amount of the Company's equity securities, a redemption of a significant amount of the Company's equity securities or the Company's involvement in other significant acquisitions of the Company's equity securities (excluding the spin-off), (ii) other actions or failures to act by the Company, or (iii) any of the Company's representations or undertakings referred to in the tax matters agreement being incorrect or violated. ADP will generally be required to indemnify the Company for any tax resulting from the spin-off if that tax results from (a) ADP's issuance of its equity securities, redemption of its equity securities, or involvement in other acquisitions of its equity securities, (b) other actions or failures to act by ADP, or (c) any of ADP's representations or undertakings referred to in the tax matters agreement being incorrect or violated. The Company recognized receivables from ADP of $0.5 million and $1.0 million as of June 30, 2018 and 2017 , respectively, and payables to ADP of $0.9 million and $1.2 million as of June 30, 2018 and 2017 , respectively, under the tax matters agreement. Provision for Income Taxes Earnings before income taxes presented below is based on the geographic location to which such earnings were attributable. June 30, 2018 2017 2016 Earnings before income taxes: U.S. $ 367.3 $ 324.9 $ 293.1 Foreign 144.7 110.4 76.0 $ 512.0 $ 435.3 $ 369.1 The provision (benefit) for income taxes consisted of the following components: June 30, 2018 2017 2016 Current: Federal $ 76.6 $ 69.6 $ 84.9 Foreign 35.8 27.5 24.5 State 21.0 14.8 16.5 Total current 133.4 111.9 125.9 Deferred: Federal (14.7 ) 17.0 (3.3 ) Foreign 2.9 2.0 1.3 State 1.7 1.9 (1.6 ) Total deferred (10.1 ) 20.9 (3.6 ) Total provision for income taxes $ 123.3 $ 132.8 $ 122.3 A reconciliation between the Company’s effective tax rate and the U.S. federal statutory rate is as follows: June 30, 2018 % 2017 % 2016 % Provision for taxes at U.S. statutory rate $ 143.9 28.1 % $ 152.4 35.0 % $ 129.2 35.0 % Increase (decrease) in provision from: State taxes, net of federal benefit 17.3 3.4 % 10.8 2.5 % 9.7 2.6 % Stock compensation - excess tax benefits (4.9 ) (1.0 )% (12.0 ) (2.8 )% — — % Noncontrolling interest (1.8 ) (0.4 )% (2.0 ) (0.5 )% (2.5 ) (0.7 )% Foreign tax rate differential (2.2 ) (0.4 )% (12.4 ) (2.8 )% (7.8 ) (2.1 )% U.S. tax on foreign earnings 19.0 3.7 % 1.1 0.3 % 0.8 0.2 % Foreign tax credits (18.3 ) (3.6 )% (1.9 ) (0.4 )% (1.5 ) (0.4 )% Foreign withholding taxes 4.5 0.9 % — — % — — % U.S. tax reform deferred tax re-measurement (27.3 ) (5.3 )% — — % — — % Valuation allowances (3.6 ) (0.7 )% 0.8 0.2 % 1.1 0.3 % Domestic production activities deduction (4.0 ) (0.8 )% (4.2 ) (1.0 )% (6.4 ) (1.7 )% Pre spin-off tax return adjustments (0.4 ) (0.1 )% — — % (0.4 ) (0.1 )% Other 1.1 0.3 % 0.2 — % 0.1 — % Provision for income taxes $ 123.3 24.1 % $ 132.8 30.5 % $ 122.3 33.1 % During fiscal 2018 , the effective tax rate was favorably impacted by $18.5 million of net tax benefit due to the Tax Reform Act as discussed above. The impact of the Tax Reform Act is reflected within the following lines in the effective tax rate reconciliation above: U.S. tax reform deferred tax re-measurement, U.S. tax on foreign earnings, Foreign tax credits, Foreign withholding taxes and State taxes, net of federal benefit. Effective July 1, 2016, the Company adopted ASU 2016-09 which favorably impacts the effective tax rate for fiscal 2018 and 2017 for excess tax benefits from stock-based compensation. The balance sheet classification and significant components of deferred income tax assets and liabilities are as follows: June 30, 2018 2017 Classification: Long term deferred tax assets (included in other assets) $ 21.9 $ 22.1 Long term deferred tax liabilities (included in deferred income taxes) (56.7 ) (65.9 ) Net deferred tax liabilities $ (34.8 ) $ (43.8 ) Components: Deferred tax assets: Accrued expenses $ 8.3 $ 13.9 Compensation and benefits 32.7 46.1 Deferred revenue 44.4 53.8 Net operating losses 5.5 10.5 Capital losses 18.8 28.8 109.7 153.1 Less: valuation allowances (21.6 ) (35.1 ) Net deferred tax assets 88.1 118.0 Deferred tax liabilities: Deferred expenses 46.7 64.9 Property, plant and equipment and intangible assets 70.1 92.1 Prepaid expenses 2.0 2.6 Undistributed foreign earnings 2.8 — Other 1.3 2.2 Deferred tax liabilities 122.9 161.8 Net deferred tax liabilities $ (34.8 ) $ (43.8 ) In the second quarter of fiscal 2018 , the Company concluded that $244.0 million of accumulated foreign earnings as of December 31, 2017 were no longer indefinitely reinvested. The Company continues to remain indefinitely reinvested in any outside basis differences with respect to its foreign subsidiaries to cover local working capital needs and restrictions and to fund future investments, including potential acquisitions. Undistributed foreign earnings that the Company intends to indefinitely reinvest aggregate to approximately $115.0 million as of June 30, 2018 . If circumstances change, and it becomes apparent that earnings currently considered indefinitely reinvested will be distributed, an additional tax charge may be necessary. The Company had federal capital losses of $ 75.4 million which expire in 2020 and state capital losses of $ 75.4 million which expire in 2020 through 2030 . The Company had foreign net operating loss carryforwards of approximately $20.4 million as of June 30, 2018 , of which $3.0 million expires in 2019 through 2028 and $17.4 million has an indefinite carryforward period. Valuation Allowance The Company recorded valuation allowances of $21.6 million and $35.1 million as of June 30, 2018 and 2017 , respectively, because the Company has concluded it is more likely than not that it will be unable to utilize net operating and capital loss carryforwards of certain subsidiaries to offset future taxable earnings. As of each reporting date, the Company’s management considers new evidence, both positive and negative, which could impact management’s view with regard to future realization of deferred tax assets. During fiscal 2018 , the valuation allowance balance decreased by $13.5 million , including $10.0 million reduction for the tax rate impact on a capital loss carryforward and $3.5 million for the expiration of certain non-U.S. tax loss carryforwards. During fiscal 2017 , the valuation allowance balance was decreased by $1.1 million for a Canadian valuation allowance adjustment based on positive evidence which indicated that the foreign loss carryforward would be utilized prior to expiration. The company concluded the deferred tax asset would be realizable based on a three-year cumulative profit position and forecasts of future year pre-tax income. Income tax payments, net of refunds were $118.9 million , $120.3 million , and $109.4 million for fiscal 2018 , 2017 , and 2016 , respectively. Unrecognized Income Tax Benefits As of June 30, 2018 , 2017 , and 2016 , the Company had unrecognized income tax benefits of $6.2 million , $6.4 million , and $4.7 million , respectively, of which $5.3 million , $4.8 million , and $3.6 million , respectively, would impact the effective tax rate, if recognized. The remainder, if recognized, would principally affect deferred taxes. A roll-forward of unrecognized tax benefits is as follows: June 30, 2018 2017 2016 Beginning of the year balance $ 6.4 $ 4.7 $ 1.9 Additions for current year tax positions 1.3 1.0 1.9 Additions for tax positions of prior years 0.7 1.2 1.1 Reductions for tax positions of prior years (0.8 ) — (0.1 ) Settlement with tax authorities (0.6 ) (0.2 ) — Expiration of the statute of limitations (0.8 ) (0.2 ) — Impact of foreign exchange rate fluctuations — (0.1 ) (0.1 ) End of year balance $ 6.2 $ 6.4 $ 4.7 During fiscal 2018 , the Company decreased its net unrecognized income tax benefits by $0.2 million . During fiscal 2017 and 2016 , the Company increased its net unrecognized income tax benefits by $1.7 million and $2.8 million , respectively. For all years, changes were based on information which indicated the extent to which certain tax positions were more likely than not to be sustained. Penalties and interest expense associated with uncertain income tax positions have been recorded in the provision for income taxes on the consolidated statements of operations. Penalties and interest incurred during fiscal 2018 , 2017 , and 2016 were not significant. As of June 30, 2018 and 2017 , the Company had an insignificant amount of accrued penalty and interest associated with uncertain tax positions, which was included within other liabilities on the consolidated balance sheets. The Company conducts business globally and, as a result, files income tax returns in the U.S. federal jurisdiction and various state, local and foreign jurisdictions. In the normal course of business, the Company is subject to examination by taxing authorities. The tax years currently under examination vary by jurisdiction. During fiscal year 2018 , the U.S. Internal Revenue Service ("IRS") completed the income tax audit for the tax year ended June 30, 2015 and the employment tax audit for calendar tax years 2014 through 2016 . The Company regularly considers the likelihood of assessments in each of the jurisdictions resulting from examinations. The Company has established a liability for unrecognized income tax benefits which it believes to be adequate in relation to the potential assessments. Once established, the liability for unrecognized tax benefits is adjusted when there is more information available, when an event occurs necessitating a change, or the statute of limitations for the relevant taxing authority to examine the tax position has expired. Income tax-related examinations currently in progress in which the Company has significant business operations are as follows: Tax Jurisdictions Fiscal Years Ended New Jersey 6/30/2008 thru 6/30/2011 Canada 6/30/2012 thru 6/30/2014 Kuwait 6/30/2017 India 6/30/2015 thru 6/30/2016 Spain 6/30/2011 Italy 6/30/2014 thru 6/30/2016 Belgium 6/30/2015 thru 6/30/2017 Based on the possible outcomes of the Company's tax audits and expiration of the statute of limitations, it is reasonably possible that the liability for uncertain tax positions will change within the next twelve months. The associated net tax impact on the effective tax rate is estimated to be a $1.0 million tax benefit, with minimal cash payments.

Earnings per Share

Earnings per Share	12 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share The numerator for both basic and diluted earnings per share is net earnings attributable to CDK. The denominator for basic and diluted earnings per share is based upon the number of weighted-average shares of the Company's common stock outstanding during the reporting periods. Diluted earnings per share also reflects the dilutive effect of unexercised in-the-money stock options and unvested restricted stock. Holders of certain stock-based compensation awards are eligible to receive dividends as described in Note 6. Net earnings allocated to participating securities were not significant for fiscal 2018 , 2017 and 2016 . The following table summarizes the components of basic and diluted earnings per share. June 30, 2018 2017 2016 Net earnings attributable to CDK $ 380.8 $ 295.6 $ 239.3 Weighted-average shares outstanding: Basic 135.8 146.7 157.0 Effect of employee stock options 0.3 0.7 0.5 Effect of employee restricted stock 0.7 0.8 0.5 Diluted 136.8 148.2 158.0 Basic earnings attributable to CDK per share $ 2.80 $ 2.01 $ 1.52 Diluted earnings attributable to CDK per share $ 2.78 $ 1.99 $ 1.51 The weighted-average number of shares outstanding used in the calculation of diluted earnings per share does not include the effect of the following anti-dilutive securities. June 30, 2018 2017 2016 Stock-based awards 0.2 0.3 0.5

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Accounts Receivable, Net	Accounts Receivable, Net Accounts receivable, net comprised of the following: June 30, 2018 2017 Trade receivables $ 374.5 $ 368.0 Lease receivables 7.5 10.4 Accounts receivable, gross 382.0 378.4 Less: allowances 7.4 6.3 Account receivable, net $ 374.6 $ 372.1 The investment in lease receivables consisted of the following: June 30, 2018 2017 Lease receivables, gross: Minimum lease payments $ 11.9 $ 23.4 Unearned income (0.6 ) (1.6 ) 11.3 21.8 Less: lease receivables, current (included in accounts receivable, net) 7.5 10.4 Lease receivables, long-term (included in other assets) $ 3.8 $ 11.4 Scheduled minimum payments on lease receivables as of June 30, 2018 were as follows: Amount Fiscal year ending 2019 $ 7.9 Fiscal year ending 2020 3.6 Fiscal year ending 2021 0.3 Fiscal year ending 2022 0.1 Fiscal year ending 2023 — $ 11.9 The Company recognized interest income on sales-type leases of $1.0 million , $1.8 million , and $2.4 million , in fiscal 2018 , 2017 , and 2016

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Depreciation expense for property, plant and equipment was $47.8 million , $40.7 million , and $35.1 million for fiscal 2018 , 2017 , and 2016 , respectively. Property, plant, and equipment at cost and accumulated depreciation consisted of the following: June 30, 2018 2017 Property, plant and equipment: Land and buildings $ 38.7 $ 39.4 Data processing equipment 241.8 215.5 Furniture and fixtures, leasehold improvements, and other 79.1 80.4 Total property, plant and equipment 359.6 335.3 Less: accumulated depreciation 227.7 200.3 Property, plant and equipment, net $ 131.9 $ 135.0

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	12 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	Goodwill and Intangible Assets, Net Changes in goodwill were as follows: Retail Solutions North America Advertising North America CDK International Total Balance as of June 30, 2016 $ 604.7 $ 214.3 $ 363.7 $ 1,182.7 Currency translation adjustments (0.1 ) — (1.4 ) (1.5 ) Balance as of June 30, 2017 604.6 214.3 362.3 1,181.2 Additions (Note 4) 19.0 11.3 — 30.3 Currency translation adjustments (0.3 ) — 6.0 5.7 Balance as of June 30, 2018 $ 623.3 $ 225.6 $ 368.3 $ 1,217.2 Components of intangible assets, net were as follows: June 30, 2018 2017 Original Cost Accumulated Amortization Intangible Assets, net Original Cost Accumulated Amortization Intangible Assets, net Customer lists $ 181.3 $ (142.4 ) $ 38.9 $ 175.5 $ (130.0 ) $ 45.5 Software 208.6 (124.3 ) 84.3 163.7 (109.4 ) 54.3 Trademarks 25.0 (24.6 ) 0.4 25.0 (24.1 ) 0.9 Other intangibles 6.9 (4.0 ) 2.9 6.4 (3.1 ) 3.3 $ 421.8 $ (295.3 ) $ 126.5 $ 370.6 $ (266.6 ) $ 104.0 Other intangibles consist primarily of purchased rights, covenants, and patents (acquired directly or through acquisitions). All of the intangible assets have finite lives and, as such, are subject to amortization. The weighted-average remaining useful life of intangible assets is 4 years ( 7 years for customer lists, 3 years for software and software licenses, and 2 years for trademarks). Amortization of intangible assets was $31.3 million , $29.6 million , and $28.9 million for fiscal 2018 , 2017 , and 2016 , respectively. Estimated amortization expenses of the Company's existing intangible assets as of June 30, 2018 were as follows: Amount Fiscal year ending 2019 $ 30.2 Fiscal year ending 2020 30.9 Fiscal year ending 2021 26.3 Fiscal year ending 2022 18.4 Fiscal year ending 2023 7.4 Thereafter 13.3 $ 126.5

Debt

Debt	12 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Debt comprised of the following: June 30, 2018 2017 Revolving credit facility $ — $ — 2019 term loan facility 203.1 215.6 2020 term loan facility 218.8 231.3 2021 term loan facility 370.0 390.0 3.30% senior notes, due 2019 250.0 250.0 4.50% senior notes, due 2024 500.0 500.0 5.875% senior notes due 2026 500.0 — 4.875% senior notes, due 2027 600.0 600.0 Capital lease obligations 0.2 1.5 Unamortized debt financing costs (21.4 ) (16.7 ) Total debt and capital lease obligations 2,620.7 2,171.7 Current maturities of long-term debt and capital lease obligations 45.2 46.5 Total long-term debt and capital lease obligations $ 2,575.5 $ 2,125.2 Revolving Credit Facility The Company has a five-year senior unsecured revolving credit facility, which was undrawn as of June 30, 2018 and 2017 . The revolving credit facility provides up to $300.0 million of borrowing capacity and includes a sub-limit of up to $100.0 million for loans in Euro and Pound Sterling. In addition, the revolving credit facility contains an accordion feature that allows for an increase in the available borrowing capacity of up to $100.0 million , subject to the agreement of lenders under the revolving credit facility or other financial institutions that become lenders to extend commitments as part of the increased revolving credit facility. Borrowings under the revolving credit facility are available for general corporate purposes. The revolving credit facility will mature on September 30, 2019 , subject to no more than two one -year extensions if lenders holding a majority of the revolving commitments approve such extensions. The revolving credit facility is unsecured and loans thereunder bear interest, at the Company's option, at (a) the rate at which deposits in the applicable currency are offered in the London interbank market (or, in the case of borrowings in Euro, the European interbank market) plus margins varying from 1.125% to 2.000% per annum based on the Company's senior, unsecured non-credit-enhanced, long-term debt ratings from Standard & Poor's Ratings Group and Moody's Investors Services Inc. (the "Ratings") or (b) solely in the case of U.S. dollar loans, (i) the highest of (A) the prime rate of JPMorgan Chase Bank, N.A., (B) a rate equal to the average of the overnight federal funds rate with a maturity of one day plus a margin of 0.500% per annum, and (C) the rate at which dollar deposits are offered in the London interbank market for a one-month interest period plus 1.000% plus (ii) margins varying from 0.125% to 1.000% per annum based on the Ratings. The unused portion of the revolving credit facility is subject to commitment fees ranging from 0.125% to 0.350% per annum based on the Ratings. Term Loan Facilities The Company has two five -year $250.0 million senior unsecured term loan facilities that mature on September 16, 2019 (the "2019 term loan facility") and December 14, 2020 (the "2020 term loan facility"), respectively. On December 9, 2016, the company entered into a five -year $400.0 million senior unsecured term loan facility that matures on December 9, 2021 (the "2021 term loan facility"). The 2019 term loan facility, 2020 term loan facility, and 2021 term loan facility are together referred to as the "term loan facilities." The term loan facilities are subject to amortization in equal quarterly installments of 1.25% of the aggregate original principal amount of the term loans made on the closing dates, with any unpaid principal amount due and payable on the maturity date. The 2019 and 2020 term loan facilities bear interest at the same calculations as are applicable to dollar loans under the revolving credit facility. The interest rate per annum on both the 2019 and 2020 term loan facilities was 3.85% as of June 30, 2018 and 2.98% as of June 30, 2017 . The 2021 term loan bears interest, at the Company's option, at (a) the rate at which deposits in the applicable currency are offered in the London interbank market (or, in the case of borrowings in Euro, the European interbank market) plus margins varying from 1.250% to 2.500% per annum based on the Company's senior, unsecured non-credit enhanced, long-term debt ratings from Standard & Poor's Ratings Group and Moody's Investors Services Inc. (the "Ratings") or (b) solely in the case of U.S. dollar loans, (i) the highest of (A) the prime rate of Bank of America, (B) a rate equal to the average of the overnight federal funds rate with a maturity of one day plus a margin of 0.500% per annum, and (C) the rate at which dollar deposits are offered in the London interbank market for a one-month interest period plus 1.000% plus (ii) margins varying from 0.250% to 1.500% per annum based on the Ratings. The interest rate per annum on the 2021 term loan facility was 3.85% as of June 30, 2018 . Restrictive Covenants and Other Matters The revolving credit facility and the term loan facilities are together referred to as the "credit facilities." The credit facilities contain various covenants and restrictive provisions that limit the Company's subsidiaries' ability to incur additional indebtedness, the Company's ability to consolidate or merge with other entities,; and the Company's subsidiaries' ability to incur liens, enter into sale and leaseback transactions, and enter into agreements restricting the ability of the Company's subsidiaries to pay dividends. If the Company fails to perform the obligations under these and other covenants, the revolving credit facility could be terminated and any outstanding borrowings, together with accrued interest, under the credit facilities could be declared immediately due and payable. The credit facilities also have, in addition to customary events of default, an event of default triggered by the acceleration of the maturity of any other indebtedness the Company may have in an aggregate principal amount in excess of $75.0 million . The credit facilities also contain financial covenants that will provide that (i) the ratio of total consolidated indebtedness to consolidated EBITDA shall not exceed 3.50 to 1.00 and (ii) the ratio of consolidated EBITDA to consolidated interest expense shall be a minimum of 3.00 to 1.00 . On December 9, 2016, the Company entered into (i) an Amendment to its Credit Agreement that covered the revolving credit facility and the 2019 term loan facility (the “2014 amendment”), and (ii) an Amendment to its Credit Agreement that covered the 2020 term loan facility (the “2015 amendment”). The 2014 amendment and the 2015 amendment amended certain “bail-in” language relating to EEA Financial Institutions and make certain changes to the definitions of “Change in Control,” “Consolidated EBITDA,” “Defaulting Lender,” and “Eligible Assignee.” Senior Notes On October 14, 2014 , the Company completed an offering of 3.30% unsecured senior notes with a $250.0 million aggregate principal amount due in 2019 (the " 2019 notes") and 4.50% unsecured senior notes with a $500.0 million aggregate principal amount due in 2024 (the "2024 notes"). The issuance price of the 2019 and 2024 notes was equal to the stated value. Interest is payable semi-annually on April 15 and October 15 of each year, and payment commenced on April 15, 2015 . The interest rate payable on each applicable series of 2019 and 2024 notes is subject to adjustment from time to time if the credit ratings assigned to any series of 2019 and 2024 notes by the rating agencies is downgraded (or subsequently upgraded). The 2019 notes will mature on October 15, 2019 , and the 2024 notes will mature on October 15, 2024 . The 2019 and 2024 notes are redeemable at the Company's option prior to September 15, 2019 for the 2019 notes and prior to July 15, 2024 for the 2024 notes at a redemption price equal to the greater of (i) 100% of the aggregate principal amount of the 2019 or 2024 notes to be redeemed, and (ii) the sum of the present value of the remaining scheduled payments (as defined in the agreement), plus in each case, accrued and unpaid interest thereon. Subsequent to September 15, 2019 and July 15, 2024 , the redemption price for the 2019 notes and the 2024 notes, respectively, will equal 100% of the aggregate principal amount of the notes redeemed, plus accrued and unpaid interest thereon. On June 18, 2018, the Company completed an offering of 5.875% unsecured senior notes with a $500.0 million aggregate principal amount due in 2026 (the " 2026 notes "). The issuance price of the 2026 notes was equal to the stated value. Interest is payable semi-annually on June 15 and December 15 of each year, and payment will commence on December 15, 2018. The 2026 notes will mature on June 15, 2026. The 2026 notes are redeemable at the Company's option prior to June 15, 2021 in whole or in part at a redemption price equal to 100% of the aggregate principal amount thereof plus accrued and unpaid interest, if any, plus the applicable "make-whole" premium. Subsequent to June 15, 2021, the Company may redeem the 2026 notes at a price equal to: (i) 102.938% of the aggregate principal amount of the 2026 notes redeemed prior to June 15, 2022; (ii) 101.958% of the aggregate principal amount of the notes redeemed on or after June 15, 2022 but prior to June 15, 2023; (iii) 100.979% of the aggregate principal amount of the 2026 notes redeemed on or after June 15, 2023 but prior to June 15, 2024; and (iv) 100.000% of the aggregate principal amount of the 2026 notes redeemed thereafter. On May 15, 2017 , the Company completed an offering of 4.875% unsecured senior notes with a $600.0 million aggregate principal amount due in 2027 (the " 2027 notes," together with the " 2024 notes, "the 2019 notes", and "the 2026 notes" are the "senior notes"). The issuance price of the 2027 notes was equal to the stated value. Interest is payable semi-annually on June 1 and December 1 of each year, and payment commenced on December 1, 2017 . The 2027 notes will mature on June 1, 2027 . The 2027 notes are redeemable at the Company's option prior to June 1, 2022 in whole or in part at a redemption price equal to 100% of the aggregate principal amount thereof plus accrued and unpaid interest, if any, plus the applicable "make-whole" premium. Subsequent to June 1, 2022 , the Company may redeem the 2027 notes at a price equal to: (i) 102.438% of the aggregate principal amount of the 2027 notes redeemed prior to June 1, 2023 ; (ii) 101.625% of the aggregate principal amount of the notes redeemed on or after June 1, 2023 but prior to June 1, 2024 ; (iii) 100.813% of the aggregate principal amount of the 2027 notes redeemed on or after June 1, 2024 but prior to June 1, 2025 ; and (iv) 100.000% of the aggregate principal amount of the 2027 notes redeemed thereafter. The senior notes are general unsecured obligations of the Company and are not guaranteed by any of the Company's subsidiaries. The senior notes rank equally in right of payment with the Company's existing and future unsecured unsubordinated obligations, including the credit facilities. The senior notes contain covenants restricting the Company's ability to incur additional indebtedness secured by liens, engage in sale/leaseback transactions, and merge, consolidate, or transfer all or substantially all of the Company's assets. The senior notes are also subject to a change of control provision whereby each holder of the senior notes has the right to require the Company to purchase all or a portion of such holder's senior notes at a purchase price equal to 101% of the principal amount thereof plus accrued and unpaid interest upon the occurrence of both a change of control and a decline in the rating of the senior notes. In November 2016, Moody's and S&P lowered their credit ratings on the senior notes to Ba1 (Stable Outlook) from Baa3 (Negative Outlook) and to BB+ (Stable Outlook) from BBB- (Negative Outlook), respectively. The downgrades triggered interest rate adjustments for the 2019 and 2024 notes. Interest rates for the 2019 notes and 2024 notes increased to 3.80% from 3.30% and to 5.00% from 4.50% , respectively, effective October 15, 2016. Capital Lease Obligations The Company has lease agreements for equipment, which are classified as capital lease obligations. The Company recognized the capital lease obligations and related leased equipment assets based on the present value of the minimum lease payments at lease inception. Unamortized Debt Financing Costs As of June 30, 2018 and 2017 , gross debt issuance costs related to debt instruments were $29.6 million and $ 21.7 million , respectively. Accumulated amortization was $8.2 million and $5.0 million as of June 30, 2018 and 2017 , respectively. Additional debt issuance costs of $7.9 million were capitalized in fiscal 2018. Debt financing costs are amortized over the terms of the related debt instruments to interest expense on the consolidated statement of operations. The Company's aggregate scheduled maturities of the long-term debt and capital lease obligations as of June 30, 2018 were as follows: Amount Fiscal year ending 2019 $ 45.2 Fiscal year ending 2020 473.1 Fiscal year ending 2021 213.8 Fiscal year ending 2022 310.0 Fiscal year ending 2023 — Thereafter 1,600.0 Total debt and capital lease obligations 2,642.1 Unamortized deferred financing costs (21.4 ) Total debt and capital lease obligations, net of unamortized deferred financing costs $ 2,620.7

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company has obligations under various operating lease agreements for facilities and equipment. Total expense under these agreements was approximately $39.0 million , $46.0 million , and $49.3 million in fiscal 2018 , 2017 , and 2016 , respectively, with minimum commitments as of June 30, 2018 as follows: Amount Fiscal year ending 2019 $ 20.0 Fiscal year ending 2020 14.3 Fiscal year ending 2021 9.8 Fiscal year ending 2022 7.3 Fiscal year ending 2023 4.4 Thereafter 10.8 $ 66.6 In addition to fixed rentals, certain leases require payment of maintenance and real estate taxes and contain escalation provisions based on future adjustments in price indices. As of June 30, 2018 , the Company had no purchase commitments and obligations related to royalty, purchase, and maintenance agreements on the Company's software, equipment, and other assets. In the normal course of business, the Company may enter into contracts in which it makes representations and warranties that relate to the performance of the Company’s services and products. The Company does not expect any material losses related to such representations and warranties. Legal Proceedings From time to time, the Company is involved in legal, regulatory, and arbitration proceedings concerning matters arising in connection with the conduct of its business activities. Such proceedings can be expensive and disruptive to normal business operations. When losses are considered probable and reasonably estimable, the Company records a liability in the amount of its best estimate for the ultimate loss. At this time, the Company is unable to reasonably estimate any reasonably possible loss or ranges of losses on the matters and proceedings described below. Competition Matters The Company is involved in several lawsuits that set forth allegations of anti-competitive agreements between the Company and The Reynolds and Reynolds Company (“Reynolds and Reynolds”) relating to the manner in which the defendants control access to, and allow integration with, their respective DMSs; several of the actions also include allegations of independent anticompetitive action on behalf of the Company. The Company has also received a Civil Investigative Demand from the Federal Trade Commission (“FTC”) requesting the production of documents relating to any agreement between the Company and Reynolds and Reynolds. As of February 1, 2018, the following antitrust lawsuits have been transferred to, or filed as part of the U.S. District Court for the Northern District of Illinois for consolidated or coordinated for pretrial proceedings as part of a Multi-District Litigation proceeding (“MDL”). Currently, the parties to the MDL are engaged in preliminary proceedings and document discovery. Each of these lawsuits seeks, among other things, treble damages and injunctive relief. • Motor Vehicle Software Corporation (“MVSC”) brought a suit against the Company, Reynolds and Reynolds, and Computerized Vehicle Registration (“CVR”), a majority owned joint venture of the Company. MVSC’s suit was originally filed in the U.S. District Court for the Central District of California on February 3, 2017. Currently, Defendants’ motions to dismiss MVSC’s second amended complaint are under consideration by the court. • Authenticom, Inc. brought a suit against CDK Global, LLC (the Company’s operating subsidiary), and Reynolds and Reynolds. Authenticom’s suit was originally filed in the U.S. District Court for the Western District of Wisconsin on May 1, 2017. Defendants’ motions to dismiss were granted in part, and dismissed in part. • Teterboro Automall, Inc. d/b/a Teterboro Chrysler Dodge Jeep Ram (“Teterboro”) brought a putative class-action suit against CDK Global, LLC and Reynolds and Reynolds. Teterboro’s suit was originally filed in the U.S. District Court for the District of New Jersey on October 19, 2017. Since that time, several more putative class actions have been filed in a variety of Federal District Courts, with substantively similar allegations; all of them have been consolidated with the MDL proceeding. On June 4, 2018, a Consolidated Class Action Complaint was filed on behalf of a putative class made up of all dealerships in the United States that directly or indirectly purchase DMS or data integration services from CDK or Reynolds and Reynolds. The Company has moved to dismiss the complaint, or in the alternative, stay the cases in the event Reynolds and Reynolds’ concurrent motion to compel arbitration (or, in the alternative, dismiss the complaint) is granted; those motions are currently being briefed by the parties. • Cox Automotive, along with multiple subsidiaries (“Cox”), brought suit against CDK Global, LLC. Cox’s suit was originally filed in the U.S. District Court for the Western District of Wisconsin, on December 11, 2017. CDK Global, LLC has moved to dismiss Cox’s claims; that motion is currently under consideration by the court. • Loop LLC d/b/a Autoloop (“Autoloop”) brought suit against CDK Global, LLC in the U.S. District Court for the Northern District of Illinois on April 9, 2018, but reserved its rights with respect to remand to the U.S. District Court for the Western District of Wisconsin at the conclusion of the MDL proceedings. On June 5, 2018, Autoloop amended its complaint as a putative class action on behalf of itself and all other similarly situated vendors. CDK Global LLC has moved to dismiss Autoloop's claims; that motion is currently being briefed by the parties. The Company believes that these cases are without merit and intends to continue to contest the claims in these cases vigorously. Legal and expert fees may be significant, and an adverse result in these suits could have a material adverse effect on the Company's business, results of operations, financial condition, or liquidity. On June 22, 2017, the Company received from the FTC a Civil Investigative Demand consisting of interrogatories and a request to produce documents relating to any agreements between the Company and Reynolds and Reynolds. On March 12, 2018, a parallel request was received from the New York State Attorney General. The Company is responding to the requests. The requests merely seek information, and no proceedings have been instituted. The Company believes there has not been any conduct by the Company or its current or former employees that would be actionable under the antitrust laws in connection with the agreements between ourselves and Reynolds and Reynolds or otherwise. At this time, the Company does not have sufficient information to predict the outcome of, or the cost of responding to or resolving these investigations. Other Proceedings The Company is otherwise involved from time to time in other proceedings not described above. Based on information available at this time, the Company believes that the resolution of these other matters currently pending will not individually or in the aggregate have a material adverse effect on our business, results of operations, financial condition, or liquidity. The Company's view of these matters may change as the proceedings and events related thereto unfold. Other Contingencies The Company has provided approximately $26.1 million of guarantees as of June 30, 2018 in the form of surety bonds issued to support certain licenses and contracts which require a surety bond as a guarantee of performance of contractual obligations. In general, the Company would only be liable for the amount of these guarantees in the event the Company defaulted in performing the obligations under each contract, of which, the probability is remote. The Company had a total of $2.0 million in letters of credit outstanding as of June 30, 2018

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income ("AOCI")	12 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (AOCI)	Accumulated Other Comprehensive Income ("AOCI") Comprehensive income is a measure of income that includes both net earnings and other comprehensive income (loss). Other comprehensive income (loss) results from items deferred on the consolidated balance sheets in CDK stockholders' (deficit) equity. The Company's other comprehensive income (loss) for fiscal 2018 , 2017 , and 2016 and AOCI balances as of June 30, 2018 , 2017 , and 2016 were comprised solely of currency translation adjustments. Other comprehensive income (loss) was $3.5 million , $2.2 million , and $(45.8) million for fiscal 2018 , 2017 , and 2016 , respectively. The accumulated balances reported in AOCI on the consolidated balance sheets for currency translation adjustments were $11.5 million , $8.0 million , and $5.8 million as of June 30, 2018 , 2017 , and 2016

Share Repurchase Transactions S

Share Repurchase Transactions Share Repurchase Transactions	12 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Share Repurchase Transactions	Share Repurchase Transactions In December 2015, the Board of Directors authorized the Company to repurchase up to $1.0 billion of its common stock as part of its $1.0 billion return of capital plan. In December 2016, the company completed its $1.0 billion return of capital plan. In January 2017, the Board of Directors terminated this authorization and replaced it with an authorization for the Company to repurchase up to $2.0 billion of our common stock as part of a new return of capital plan. Under the authorization, the Company may purchase its common stock in the open market or in privately negotiated transactions from time to time as permitted by federal securities laws and other legal requirements. The actual timing, number, and price of any shares to be repurchased is determined at management's discretion and depends on a number of factors, including the market price of the shares, general market and economic conditions, and other potential uses for free cash flow including, but not limited to, potential acquisitions. In December 2015, the Company entered into an accelerated share repurchase agreement ("December 2015 ASR") to purchase $250.0 million of the Company's common stock. Under the terms of the December 2015 ASR, the Company made a $250.0 million payment in December 2015 and received an initial delivery of approximately 4.3 million shares of the Company's common stock. In June 2016, the Company received an additional 1.0 million shares of common stock in final settlement of the December 2015 ASR, for a total of 5.3 million shares. The value reflected in treasury stock upon completion of the December 2015 ASR represents the value of the shares received based on the closing price of the Company's stock on the respective settlement dates, which is higher than the $250.0 million cash paid by $6.2 million . In June 2016, the Company entered into an accelerated share repurchase agreement ("June 2016 ASR") to purchase $300.0 million of the Company's common stock. Under the terms of the June 2016 ASR, the Company made a $300.0 million payment in June 2016 and received an initial delivery of approximately 4.3 million of the Company's common stock. In September 2016, the Company received an additional 1.0 million shares of common stock in final settlement of the June 2016 ASR, for a total of 5.3 million shares. The value reflected in treasury stock upon completion of the June 2016 ASR represents the value of the shares received based on the closing price of the Company's stock on the respective settlement dates, which is less than the $300.0 million cash paid by $3.1 million . In December 2016, the Company entered into an accelerated share repurchase agreement ("December 2016 ASR") to purchase $330.0 million of the Company's common stock. Under the terms of the December 2016 ASR, the Company made a $330.0 million payment in December 2016 and received an initial delivery of approximately 4.5 million shares of the Company's common stock. In May 2017, the Company received an additional 0.7 million shares of common stock in final settlement of the December 2016 ASR, for a total of 5.2 million shares. The value reflected in treasury stock upon completion of the December 2016 ASR represents the value of the shares received based on the closing price of the Company's stock on the respective settlement dates, which is less than the $330.0 million cash paid by $21.2 million . In May 2017, the Company entered into an accelerated share repurchase agreement ("May 2017 ASR") to purchase $350.0 million of the Company's common stock. Under the terms of the May 2017 ASR, the Company made a $350.0 million payment in May 2017 and received initial delivery of approximately 4.5 million of the Company's common stock. In September 2017, the Company received an additional 1.1 million shares of common stock in final settlement of the May 2017 ASR, for a total of 5.6 million shares. The value reflected in treasury stock upon completion of the May 2017 ASR represents the value of the shares received based on the closing price of the Company's stock on the respective settlement dates, which is less than the $350.0 million cash paid by $3.1 million . Additionally, the Company made open market repurchases of 9.4 million shares of the Company's common stock during fiscal 2018 for a total cost of $623.6 million and 0.3 million shares of the Company's common stock during fiscal 2017 for a total cost of $20.0 million

Transactions with ADP

Transactions with ADP	12 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
Transactions with ADP	Transactions with ADP Prior to the spin-off, the Company entered into a transition services agreement with ADP to provide for an orderly transition to being an independent company. The Company entered into a data services agreement with ADP prior to the spin-off under which ADP will provide the Company with certain data center sharing services relating to the provision of information technology, platform support, hosting and network services. The term of the agreement expired on September 30, 2016, two years after the spin-off date. The Company entered into an intellectual property transfer agreement with ADP prior to the spin-off under which ADP assigned to the Company certain patents, trademarks, copyrights, and other intellectual property developed or owned by ADP or certain of its subsidiaries and with respect to which the Company is the primary or exclusive user today or the anticipated primary or exclusive user in the future. The term of the agreement is perpetual after the spin-off date. For fiscal 2016, the Company recorded $2.2 million of expenses related to the transition services agreement. The Company recorded $3.4 million and $7.5 million of expenses related to the data services agreement in the accompanying financial statements for fiscal 2017 and 2016, respectively.

Financial Data By Segment

Financial Data By Segment	12 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Financial Data by Segment	Financial Data by Segment The Company is organized into two main operating groups. The Company's first operating group is CDK North America which is comprised of two reportable segments, Retail Solutions North American and Advertising North America. The second operating group, which is also a reportable segment, is CDK International. The primary components of the Other segment are corporate allocations and other expenses not recorded in the segment results, such as stock-based compensation expense, corporate costs, interest expense, costs attributable to the business transformation plan, results of our captive insurance company and certain unallocated expenses. Certain expenses are charged to the reportable segments at a standard rate for management reasons. Other costs are recorded based on management responsibility. Retail Solutions North America Advertising North America CDK International Other Total Year ended June 30, 2018 Revenues $ 1,611.1 $ 305.8 $ 356.3 $ — $ 2,273.2 Earnings before income taxes 659.0 37.1 97.7 (281.8 ) 512.0 Assets 1,202.5 332.0 509.6 964.3 3,008.4 Capital expenditures 39.1 — 5.8 1.1 46.0 Depreciation and amortization 59.0 3.3 11.7 5.1 79.1 Year ended June 30, 2017 Revenues $ 1,600.7 $ 307.6 $ 311.9 $ — $ 2,220.2 Earnings before income taxes 605.5 44.4 75.0 (289.6 ) 435.3 Assets 1,231.1 312.1 538.9 801.0 2,883.1 Capital expenditures 51.6 — 7.8 3.0 62.4 Depreciation and amortization 48.2 3.1 11.4 7.6 70.3 Year ended June 30, 2016 Revenues $ 1,521.3 $ 279.7 $ 313.6 $ — $ 2,114.6 Earnings before income taxes 481.3 27.5 61.1 (200.8 ) 369.1 Assets 1,240.9 307.9 539.4 276.8 2,365.0 Capital expenditures 37.4 — 8.3 5.1 50.8 Depreciation and amortization 39.3 3.7 12.5 8.5 64.0 Supplemental disclosure of revenue by type was as follows: Retail Solutions North America: Subscription : for software and technology solutions provided to automotive retailers and OEMs, which includes: • DMSs and layered applications, which may be installed on-site at the customer’s location, or hosted and provided on a SaaS basis, including ongoing maintenance and support; • Interrelated services such as installation, initial training, and data updates; • Websites, search marketing, and reputation management services; and • Hardware on a service basis, meaning no specific assets are identified or a substantive right of substitution exists. Transaction : fees per transaction to process credit reports, vehicle registrations, and automotive equity mining. Other : consulting and professional services, sales of hardware, and other miscellaneous revenues. Advertising North America revenues are primarily earned for placing internet advertisements for OEMs and automotive retailers. CDK International revenues are generated primarily from Subscription revenue as described above, aside from the absence of website offerings. Revenues Years Ended June 30, 2018 2017 2016 CDK North America: Retail Solutions North America: Subscription revenue $ 1,306.3 $ 1,261.4 $ 1,191.2 Transaction revenue 164.0 179.5 179.1 Other revenue 140.8 159.8 151.0 Total Retail Solutions North America $ 1,611.1 $ 1,600.7 $ 1,521.3 Advertising North America revenue 305.8 307.6 279.7 CDK International revenue 356.3 311.9 313.6 Total $ 2,273.2 $ 2,220.2 $ 2,114.6 Revenues and property, plant and equipment, net by geographic area were as follows: United States Europe Canada Other Total Year ended June 30, 2018 Revenues $ 1,811.7 $ 253.3 $ 105.0 $ 103.2 $ 2,273.2 Property, plant and equipment, net 105.9 14.1 3.9 8.0 131.9 Year ended June 30, 2017 Revenues $ 1,808.9 $ 221.0 $ 99.2 $ 91.1 $ 2,220.2 Property, plant and equipment, net 104.5 16.3 3.7 10.5 135.0 Year ended June 30, 2016 Revenues $ 1,706.4 $ 227.8 $ 94.5 $ 85.9 $ 2,114.6 Property, plant and equipment, net 91.2 15.3 2.1 10.0 118.6

Quarterly Financial Results (Un

Quarterly Financial Results (Unaudited)	12 Months Ended
	Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Results (Unaudited)	Quarterly Financial Results (Unaudited) Summarized quarterly results of operations for the fiscal 2018 and 2017 were as follows: First Quarter Second Quarter Third Quarter Fourth Quarter Year ended June 30, 2018 Revenues $ 565.7 $ 561.7 $ 576.6 $ 569.2 Gross profit (1) 258.0 270.9 281.6 280.7 Earnings before income taxes 119.8 120.3 135.0 136.9 Net earnings 83.1 106.2 97.8 101.6 Net earnings attributable to noncontrolling interest 1.8 2.2 1.7 2.2 Net earnings attributable to CDK 81.3 104.0 96.1 99.4 Basic earnings attributable to CDK per share $ 0.58 $ 0.76 $ 0.71 $ 0.76 Diluted earnings attributable to CDK per share $ 0.57 $ 0.75 $ 0.71 $ 0.75 Year ended June 30, 2017 Revenues $ 550.7 $ 547.8 $ 556.3 $ 565.4 Gross profit (1) 235.6 244.6 248.6 256.5 Earnings before income taxes 111.9 118.9 110.4 94.1 Net earnings 79.2 83.6 78.8 60.9 Net earnings attributable to noncontrolling interest 2.3 0.9 1.5 2.2 Net earnings attributable to CDK 76.9 82.7 77.3 58.7 Basic earnings attributable to CDK per share $ 0.51 $ 0.56 $ 0.53 $ 0.41 Diluted earnings attributable to CDK per share $ 0.51 $ 0.55 $ 0.53 $ 0.41

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Jun. 30, 2018
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	Schedule II - Valuation and Qualifying Accounts (In millions) Column A Column B Column C Column D Column E Additions Balance at beginning of period Charged (credited) to costs and expenses Charged (credited) to other accounts Deductions Balance at end of period Year ended June 30, 2018 Accounts receivable allowances $ 6.3 $ 3.7 $ — $ (2.6 ) (1) $ 7.4 Deferred tax valuation allowance 35.1 — — (13.5 ) (2) 21.6 Year ended June 30, 2017 Accounts receivable allowances $ 7.1 $ 1.7 $ — $ (2.5 ) (1) $ 6.3 Deferred tax valuation allowance 34.3 1.9 — (1.1 ) 35.1 Year ended June 30, 2016 Accounts receivable allowances $ 6.8 $ 2.3 $ (0.1 ) $ (1.9 ) (1) $ 7.1 Deferred tax valuation allowance 33.4 1.1 (0.2 ) (3) — 34.3 (1) Doubtful accounts written off, less recoveries on accounts previously written off. (2) Includes $10.0 million reduction for the tax rate impact on a capital loss carryforward and $3.5 million for the expiration of certain non-U.S. tax loss carryforwards.

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Consolidation	Consolidation The financial statements include the accounts of the Company and its wholly owned subsidiaries. In addition, the financial statements include the accounts of Computerized Vehicle Registration ("CVR") in which CDK holds a controlling financial or management interest. Intercompany transactions and balances between consolidated CDK businesses have been eliminated. The Company's share of earnings or losses of non-controlled affiliates, over which the Company exercises significant influence (generally a 20% to 50% ownership interest), are included in the consolidated operating results using the equity
Business Combinations	Business Combinations The purchase price allocations for acquisitions are based on estimates of the fair value of tangible and intangible assets acquired and liabilities assumed. The Company engages independent valuation specialists, when necessary, to assist with purchase price allocations and uses recognized valuation techniques, including the income and market approaches, to determine fair value. Management makes estimates and assumptions in determining purchase price allocations and valuation analyses, which may involve significant unobservable inputs. The excess of the purchase price over the estimated fair values of the underlying assets acquired and liabilities assumed is allocated to goodwill. In certain circumstances, the determination of the purchase price and allocation to assets acquired and liabilities assumed are based upon preliminary estimates and assumptions. Accordingly, the allocation may be subject to revision during the measurement period, which may be up to one year from the acquisition date, when the Company receives final information, including appraisals and other analyses. Measurement period adjustments are recorded to goodwill in the reporting period in which the adjustments to the provisional amounts are determined.
Restructuring	Restructuring Restructuring expenses consist of employee-related costs, including severance and other termination benefits calculated based on long-standing benefit practices and local statutory requirements, and contract termination costs. Restructuring liabilities are recognized at fair value in the period the liability is incurred. In some jurisdictions, the Company has ongoing benefit arrangements under which the Company records the estimated severance and other termination benefits when such costs are deemed probable and estimable, approved by the appropriate corporate management, and if actions required to complete the termination plan indicate that it is unlikely that significant changes to the plan will be made or the plan will be withdrawn. In jurisdictions where there is not an ongoing benefit arrangement, the Company records estimated severance and other termination benefits when appropriate corporate management has committed to the plan and the benefit arrangement is communicated to the affected employees. A liability for costs to terminate a contract before the end of its term is recognized at fair value when the Company terminates the contract in accordance with its terms. Estimates are evaluated periodically to determine whether an adjustment is required.
Revenue Recognition	Revenue Recognition The Company recognizes software revenues in accordance with Accounting Standards Codification (“ASC”) 985-605, “Software - Revenue Recognition,” and non-software related revenue, including Software-as-a-Service (“SaaS”), in accordance with ASC 605, "Revenue Recognition" ("ASC 605"). The Company generates revenues from four categories: subscription, digital advertising, transactional services, and other. Taxes collected from customers and remitted to governmental authorities are presented on a net basis; that is, such taxes are excluded from revenues. Subscription. In the RSNA and CDKI segments, CDK provides software and technology solutions for automotive retailers and OEMs, which includes: • Dealer Management Systems (“DMSs”) and layered applications, where the software may be installed on-site at the customer’s location, or hosted and provided on a SaaS basis, including ongoing maintenance and support; • Interrelated services such as installation, initial training, and data updates; • Websites, search marketing, and reputation management services (RSNA only); and • Hardware on a service basis, meaning no specific assets are identified or a substantive right of substitution exists. Revenues for term licenses are recognized ratably over the software license term, as vendor-specific objective evidence of the fair values of the individual elements in the sales arrangement does not exist. Revenue recognition commences at the installation dates, when customer acceptance has occurred, and collectability of a determinable amount is probable. In the case of hosted applications, the customer does not have the contractual right to take possession of the software and the items delivered at the outset of the contract (e.g., installation, training, etc.) do not have value to the customer without the software license and ongoing support and maintenance. Any upfront fees charged in the case of hosted arrangements are recognized ratably over the expected benefit period of the arrangement, typically five years. The unrecognized portion of these revenue elements is recorded as deferred revenue. Advertising services. In the ANA segment, the Company receives revenues from the placement of internet advertising for automotive retailers and OEMs. Advertising revenues are recognized when the services are rendered. Transaction revenues . In the RSNA segment, the Company receives fees per transaction for providing auto retailers interfaces with third parties to process credit reports, vehicle registrations, and automotive equity mining. Revenue is recognized at the time the services are rendered. Transaction revenues are recorded in revenues gross of costs incurred when the Company is substantively and contractually responsible for providing the service, software, and/or connectivity to the customers, and therefore, bears the risks and benefits of the contractual arrangement. When the Company is acting as an agent in the transaction, revenue is recorded net of costs incurred. Other
Income Taxes	Income Taxes Income tax expense is recognized for the amount of taxes payable or refundable for the current year. Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, and for operating losses and tax credit carryforwards. Management must make assumptions, judgments, and estimates to determine the provision for income taxes, taxes payable or refundable, and deferred tax assets and liabilities. The Company's assumptions, judgments, and estimates take into consideration the realization of deferred tax assets and changes in tax laws or interpretations thereof. The Company's income tax returns are subject to examination by various tax authorities. A change in the assessment of the outcomes of such matters could materially impact the Company's consolidated financial statements. The Company records a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized. In determining the need for a valuation allowance, the Company considers future market growth, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies. In the event the Company determines that it is more likely than not that an entity will be unable to realize all or a portion of its deferred tax assets in the future, the Company would increase the valuation allowance and recognize a corresponding charge to earnings in the period in which such a determination is made. Likewise, if the Company later determines that it is more likely than not that the deferred tax assets will be realized, the Company would reverse the applicable portion of the previously recognized valuation allowance. In order to realize deferred tax assets, the Company must be able to generate sufficient taxable income of the appropriate character in the jurisdictions in which the deferred tax assets are located. The Company recognizes tax benefits for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized upon ultimate settlement. Unrecognized tax benefits are tax benefits claimed in the Company's income tax returns that do not meet these recognition and measurement standards. Assumptions, judgments, and the use of estimates are required in determining whether the "more likely than not" standard has been met when developing the provision for income taxes. If certain pending tax matters settle within the next twelve months, the total amount of unrecognized tax benefits may increase or decrease for all open tax years and jurisdictions. Audit outcomes and the timing of audit settlements are subject to significant uncertainty. The Company continually assesses the likelihood and amount of potential adjustments and adjusts the income tax provision, the current taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known.
Stock-Based Compensation	Stock-Based Compensation Certain of the Company's employees (a) have been granted stock options to purchase shares of the Company’s common stock and (b) have been granted restricted stock or restricted stock units under which shares of the Company's common stock vest based on the passage of time or achievement of performance and market conditions. The Company recognizes stock-based compensation expense in net earnings based on the fair value of the award on the date of the grant. The Company records the impact of forfeitures on stock compensation expense in the period the forfeitures occur. The Company determines the fair value of stock options issued using a binomial option-pricing model. The binomial option-pricing model considers a range of assumptions related to volatility, dividend yield, risk-free interest rate, and employee exercise behavior. Expected volatilities utilized in the binomial option pricing model are based on a combination of implied market volatilities and historical volatilities of peer companies. Similarly, the dividend yield is based on historical experience and expected future dividend payments. The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant. The binomial option pricing model also incorporates exercises based on an analysis of historical data. The expected life of a stock option grant is derived from the output of the binomial model and represents the period of time that options granted are expected to be outstanding. The grant date fair value of restricted stock and restricted stock units that vest upon achievement of service conditions is based on the closing price of the Company's common stock on the date of grant. The Company also grants performance-based awards that vest over a performance period. Certain performance-based awards are further subject to adjustment (increase or decrease) based on a market condition defined as total shareholder return of the Company’s common stock compared to a peer group of companies. The fair value of performance-based awards subject to a market condition is determined using a Monte Carlo simulation model. The principal variable assumptions utilized in determining the grant date fair value of performance-based awards subject to a market condition include the risk-free rate, stock volatility, dividend yield, and correlations between the Company's stock price and the stock prices of the peer group of companies. The probability associated with the achievement of performance conditions affects the vesting of our performance-based awards. Expense is only recognized for those shares expected to vest. The Company adjusts stock-based compensation expense (increase or decrease) when it becomes probable that actual performance will differ from the estimate. Upon adopting Accounting Standards Update (“ASU”) 2016-09 "Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-Based Payment Accounting," in fiscal 2017, we recognize forfeitures when they occur and no longer estimate a forfeiture rate to recognize stock-based compensation expense.
Cash and Cash Equivalents	Cash and Cash Equivalents
Accounts Receivable, Net	Accounts Receivable, Net Accounts receivable, net is comprised of trade receivables and lease receivables, net of allowances. Trade receivables consist of amounts due to the Company in the normal course of business, which are not collateralized and do not bear interest. Lease receivables primarily relate to sales-type leases arising from the sale of hardware elements in bundled DMS or other integrated solutions. Lease receivables represent the current portion of the present value of the minimum lease payments at the beginning of the lease term. The long-term portion of the present value of the minimum lease payments is included within other assets on the consolidated balance sheets. The Company considers lease receivables to be a single portfolio segment.
Deferred Costs	Deferred Costs Costs to deliver services are expensed to cost of revenues as incurred with the exception of specific costs directly related to transition or installation activities, including payroll-related costs for the Company's implementation and training teams, as well as commission costs for the sale. These costs are deferred and expensed proportionately over the same period that deferred revenues are recognized as revenues. Deferred amounts are monitored regularly to ensure appropriate asset and expense recognition.
Funds Receivable and Funds Held for Clients and Client Fund Obligations	Funds Receivable and Funds Held for Clients and Client Fund ObligationsFunds receivable and funds held for clients represent amounts received or expected to be received from clients in advance of performing titling and registration services on behalf of those clients. These amounts are classified within other current assets on the consolidated balance sheets. The total amount due to remit for titling and registration obligations with the department of motor vehicles is recorded to client fund obligations which is classified as accrued expenses and other current liabilities on the consolidated balance sheets.
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net is stated at cost and depreciated over the estimated useful lives of the assets using the straight-line method. Leasehold improvements are amortized over the shorter of the term of the lease or the estimated useful lives of the improvements. The estimated useful lives of assets are primarily as follows: Buildings 20 to 40 years Furniture and fixtures 4 to 7 years Data processing equipment 2 to 5 years
Goodwill	Goodwill The Company tests goodwill for impairment annually and whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company tests goodwill for impairment at the reporting unit level. A reporting unit is an operating segment or a component of an operating segment. The Company tests impairment by first comparing the fair value of each reporting unit to its carrying amount. If the carrying value for a reporting unit exceeds its fair value, the Company then compares the implied fair value of the Company's goodwill to the carrying amount in order to determine the amount of the impairment, if any.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
Internal Use Software	Internal Use Software The Company’s policy provides for the capitalization of external direct costs of materials and services associated with developing or obtaining internal use computer software. In addition, the Company’s policy also provides for the capitalization of certain payroll and payroll-related costs for employees who are directly associated with the internal use computer software projects. The amount of capitalizable payroll costs with respect to these employees is limited to the time directly spent on such projects. Costs associated with preliminary project stage activities, training, maintenance, and all other post-implementation stage activities are expensed as incurred. The Company also expenses internal costs related to minor upgrades and enhancements, as it is impracticable to separate these costs from normal maintenance activities. The Company amortizes internal use software typically over a three to five
Computer Software to be Sold, Leased or Otherwise Marketed	Computer Software to be Sold, Leased, or Otherwise Marketed
Foreign Currency	Foreign Currency For foreign subsidiaries where the local currency is the functional currency, net assets are translated into U.S. dollars based on exchange rates in effect for each period, and revenues and expenses are translated at average exchange rates in the periods. Gains or losses from balance sheet translation of such entities are included in accumulated
Fair Value Measurements	Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. A fair value hierarchy has been established based on three levels of inputs, of which the first two are considered observable and the last unobservable. • Level 1: Inputs that are based upon quoted prices in active markets for identical assets or liabilities. • Level 2: Inputs, other than quoted prices included within Level 1, which are observable for the asset or liability, either directly or indirectly. • Level 3: Unobservable inputs where there is little or no market activity for the asset or liability. These inputs reflect management's best estimate of what market participants would use to price the assets or liabilities at the measurement date.
Concentrations	Concentrations The C ompany maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company maintains deposits in a diversified group of financial institutions, has not experienced any losses to date, and monitors the credit ratings of the primary depository institutions where deposits reside.
New Accounting Pronouncements	Recently Issued Accounting Pronouncements In January 2017, the Financial Accounting Standard Board (“FASB”) issued ASU 2017-04, “Intangibles - Goodwill and Other.” ASU 2017-04 simplifies the accounting for goodwill impairment by eliminating Step 2 of the current goodwill impairment test, which required a hypothetical purchase price allocation. Goodwill impairment will now be the amount by which the reporting unit’s carrying value exceeds its fair value, limited to the carrying value of the goodwill. ASU 2017-04 is effective for financial statements issued for fiscal years, and interim periods beginning after December 15, 2019. The adoption of ASU 2017-04 is not expected to have a material impact on the Company's consolidated results of operations, financial condition, or cash flows. In November 2016, the FASB issued ASU 2016-18, “Restricted Cash.” ASU 2016-18 clarifies cash flow presentation for restricted cash. ASU 2016-18 is effective for financial statements issued for fiscal years, and interim periods beginning after December 15, 2017. The adoption of ASU 2016-18 will not have a material impact on the Company's consolidated statements of cash flows. In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments (Topic 230).” ASU 2016-15 addresses eight specific cash flow issues where there is diversity in practice in how these certain cash receipts and cash payments are presented and classified in the statements of cash flows. ASU 2016-15 is effective for financial statements issued for fiscal years, and interim periods beginning after December 15, 2017. The adoption of ASU 2016-15 will not have a material impact on the Company's consolidated statements of cash flows. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 requires that lessees recognize right-of-use assets and lease liabilities for any lease classified as either a finance or operating lease that is not considered short-term. The accounting applied by lessors is largely consistent with the existing lease standard. ASU 2016-02 is effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2018 and required companies to apply a modified retrospective transition as of the earliest period presented. In July 2018, the FASB issued ASU 2018-11, “Lease (Topic 842), Targeted Improvements,” which permits companies to apply a modified retrospective transition as of the effective date and provide comparative period disclosures under ASC Topic 840. The Company has obligations under lease agreements for facilities, equipment and vehicles, which are classified as operating leases under the existing lease standard. While the Company is still evaluating the impact that ASU 2016-02 will have on the consolidated results of operations, financial condition, or cash flows, the Company's financial statements will reflect an increase in both assets and liabilities due to the requirement to recognize right-of-use assets and lease liabilities on the consolidated balance sheets for its facility and equipment leases. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 requires an entity to recognize revenue depicting the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 will also result in enhanced revenue related disclosures. The guidance permits two methods of adoption: 1) retrospectively to each prior reporting period presented (full retrospective), or 2) retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective). In July 2015, the FASB deferred the effective date of ASU 2014-09 by one year and subsequently issued ASU 2015-14, "Revenue from Contracts with Customers (ASC 606): Deferral of the Effective Date." As a result, the standard and subsequent amendments thereto, will be effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2017. During fiscal 2017, the Company established a cross-functional implementation team which evaluated the impact of the new standard on its revenue contracts. The Company will adopt this standard on a modified retrospective basis, on July 1, 2018. The Company expects the most significant impacts of adopting ASU 2014-09, and the related ASUs, on its consolidated results of operations, financial condition, or cash flows, will be as follows: • The Company currently applies accounting guidance for software, ASC 985-605, and recognizes revenues for on-site licenses ratably over the software license term, as CDK lacks vendor-specific objective evidence ("VSOE") of the fair values of the individual elements of the sales arrangement. Under ASC 606, the Company will no longer be required to establish VSOE and will allocate an arrangement's transaction price to on-site software licenses, based on estimated standalone selling price at the time of the sale. Therefore, upon adoption of the standard, the Company will recognize revenue and costs for on-site licenses upon installation of the software. Aside from revenues for on-site software licenses, the Company will continue to recognize the majority of its revenues, including SaaS and other service arrangements ratably over the term of arrangement and transaction revenue when service is rendered. • In ASC 340, "Other Assets and Deferred Costs", the FASB provides guidance for contract costs that require capitalization and subsequent amortization - costs to obtain a customer contract, and costs to fulfill the contract, which for CDK consists primarily of direct sales commissions and implementation costs of service arrangements. The adoption of the new standard will result in an increase in the costs deferred and amortized over the economic life of the contract. The Company is in the process of finalizing the impact of adoption of this standard on its financial statements and currently anticipates at the date of adoption a pre-tax cumulative adjustment increasing retained earnings, primarily as a result of the two items discussed above, of approximately $150 million to $180 million , with a corresponding decrease in deferred revenues and increase in unbilled receivables due to timing of revenue recognition for on-site software and a slight increase in deferred costs due to costs capitalized under ASC 340 partially offset by costs related to on-site software installations prior to the date of adoption. Implications to tax related accounts are not included in these estimated amounts. The Company’s assessment of the full impact of adoption of the standard is subject to finalization, such that the actual impact of the adoption may differ from the estimated range described above.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Estimated Useful Lives of Property, Plant and Equipment	The estimated useful lives of assets are primarily as follows: Buildings 20 to 40 years Furniture and fixtures 4 to 7 years Data processing equipment 2 to 5 years June 30, 2018 2017 Property, plant and equipment: Land and buildings $ 38.7 $ 39.4 Data processing equipment 241.8 215.5 Furniture and fixtures, leasehold improvements, and other 79.1 80.4 Total property, plant and equipment 359.6 335.3 Less: accumulated depreciation 227.7 200.3 Property, plant and equipment, net $ 131.9 $ 135.0

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Summary of Restructuring Expenses and the Related Accruals	The following table summarizes the fiscal 2018 and 2017 activity for the restructuring accrual: Employee-Related Costs Contract Termination Costs Total Balance as of June 30, 2016 $ 9.0 $ 0.9 $ 9.9 Charges 14.5 4.8 19.3 Cash payments (16.5 ) (3.0 ) (19.5 ) Adjustments (0.6 ) (0.3 ) (0.9 ) Balance as of June 30, 2017 6.4 2.4 8.8 Charges 20.8 1.8 22.6 Cash payments (21.5 ) (3.0 ) (24.5 ) Adjustments (1.3 ) (0.4 ) (1.7 ) Balance as of June 30, 2018 $ 4.4 $ 0.8 $ 5.2

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation Expense and Related Income Tax Benefits	The following table represents stock-based compensation expense and the related income tax benefits for fiscal 2018 , 2017 , and 2016 , respectively: June 30, 2018 2017 2016 Cost of revenues $ 4.9 $ 6.3 $ 6.2 Selling, general and administrative expenses 30.8 49.1 30.2 Total pre-tax stock-based compensation expense $ 35.7 $ 55.4 $ 36.4 Income tax benefit $ 10.5 $ 19.4 $ 12.9
Stock Options Activity	Stock Options Number of Options (in thousands) Weighted-Average Exercise Price (in dollars) Weighted-Average Remaining Contractual Life (in years) Aggregate Intrinsic Value (in millions) Options outstanding as of June 30, 2017 1,310 $ 39.70 Options granted 25 62.03 Options exercised (334 ) 26.77 Options canceled (44 ) 51.77 Options outstanding as of June 30, 2018 957 $ 44.25 6.7 $ 19.9 Exercisable as of June 30, 2018 532 $ 34.55 5.6 $ 16.2
Restricted Stock Units Award Activity	Time-Based Restricted Stock and Time-Based Restricted Stock Units Restricted Stock Restricted Stock Units Number of Shares (in thousands) Weighted-Average Grant Date Fair Value (in dollars) Number of Units (in thousands) Weighted-Average Grant Date Fair Value (in dollars) Non-vested restricted shares/units as of June 30, 2017 497 $ 53.98 214 $ 66.17 Restricted shares/units granted 184 63.71 79 64.86 Restricted shares/units vested (230 ) 50.23 (138 ) 50.12 Restricted shares/units forfeited (72 ) 58.66 (13 ) 58.65 Non-vested restricted shares/units as of June 30, 2018 379 $ 60.14 142 $ 58.55 Performance-Based Restricted Stock Units Restricted Stock Units Number of Units (in thousands) Weighted-Average Grant Date Fair Value (in dollars) Non-vested restricted units as of June 30, 2017 742 $ 65.41 Restricted units granted 236 52.36 Dividend equivalents 7 57.53 Restricted units vested (513 ) 50.38 Restricted units forfeited (61 ) 59.33 Non-vested restricted units as of June 30, 2018 411 $ 63.26
Assumptions Used To Estimate Fair Value For Stock Options Granted	The following table presents the assumptions used to determine the fair value of the stock options granted by the Company: Fiscal 2018 Fiscal 2017 Fiscal 2016 Risk-free interest rate 2.0 % 1.4 % 1.8 % Dividend yield 0.9 % 0.9 % 0.9 % Weighted-average volatility factor 24.5 % 24.5 % 24.7 % Weighted-average expected life (in years) 6.3 6.3 6.3 Weighted-average fair value (in dollars) $ 15.65 $ 13.90 $ 12.55

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Schedule of Earnings before Income Taxes by Geographic Location	Earnings before income taxes presented below is based on the geographic location to which such earnings were attributable. June 30, 2018 2017 2016 Earnings before income taxes: U.S. $ 367.3 $ 324.9 $ 293.1 Foreign 144.7 110.4 76.0 $ 512.0 $ 435.3 $ 369.1
Schedule of Components of Income Tax Provision (Benefit)	The provision (benefit) for income taxes consisted of the following components: June 30, 2018 2017 2016 Current: Federal $ 76.6 $ 69.6 $ 84.9 Foreign 35.8 27.5 24.5 State 21.0 14.8 16.5 Total current 133.4 111.9 125.9 Deferred: Federal (14.7 ) 17.0 (3.3 ) Foreign 2.9 2.0 1.3 State 1.7 1.9 (1.6 ) Total deferred (10.1 ) 20.9 (3.6 ) Total provision for income taxes $ 123.3 $ 132.8 $ 122.3
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation between the Company’s effective tax rate and the U.S. federal statutory rate is as follows: June 30, 2018 % 2017 % 2016 % Provision for taxes at U.S. statutory rate $ 143.9 28.1 % $ 152.4 35.0 % $ 129.2 35.0 % Increase (decrease) in provision from: State taxes, net of federal benefit 17.3 3.4 % 10.8 2.5 % 9.7 2.6 % Stock compensation - excess tax benefits (4.9 ) (1.0 )% (12.0 ) (2.8 )% — — % Noncontrolling interest (1.8 ) (0.4 )% (2.0 ) (0.5 )% (2.5 ) (0.7 )% Foreign tax rate differential (2.2 ) (0.4 )% (12.4 ) (2.8 )% (7.8 ) (2.1 )% U.S. tax on foreign earnings 19.0 3.7 % 1.1 0.3 % 0.8 0.2 % Foreign tax credits (18.3 ) (3.6 )% (1.9 ) (0.4 )% (1.5 ) (0.4 )% Foreign withholding taxes 4.5 0.9 % — — % — — % U.S. tax reform deferred tax re-measurement (27.3 ) (5.3 )% — — % — — % Valuation allowances (3.6 ) (0.7 )% 0.8 0.2 % 1.1 0.3 % Domestic production activities deduction (4.0 ) (0.8 )% (4.2 ) (1.0 )% (6.4 ) (1.7 )% Pre spin-off tax return adjustments (0.4 ) (0.1 )% — — % (0.4 ) (0.1 )% Other 1.1 0.3 % 0.2 — % 0.1 — % Provision for income taxes $ 123.3 24.1 % $ 132.8 30.5 % $ 122.3 33.1 %
Balance Sheet Classification and Significant Components of Deferred Income Tax Assets and Liabilities	The balance sheet classification and significant components of deferred income tax assets and liabilities are as follows: June 30, 2018 2017 Classification: Long term deferred tax assets (included in other assets) $ 21.9 $ 22.1 Long term deferred tax liabilities (included in deferred income taxes) (56.7 ) (65.9 ) Net deferred tax liabilities $ (34.8 ) $ (43.8 ) Components: Deferred tax assets: Accrued expenses $ 8.3 $ 13.9 Compensation and benefits 32.7 46.1 Deferred revenue 44.4 53.8 Net operating losses 5.5 10.5 Capital losses 18.8 28.8 109.7 153.1 Less: valuation allowances (21.6 ) (35.1 ) Net deferred tax assets 88.1 118.0 Deferred tax liabilities: Deferred expenses 46.7 64.9 Property, plant and equipment and intangible assets 70.1 92.1 Prepaid expenses 2.0 2.6 Undistributed foreign earnings 2.8 — Other 1.3 2.2 Deferred tax liabilities 122.9 161.8 Net deferred tax liabilities $ (34.8 ) $ (43.8 )
Schedule of Unrecognized Tax Benefits Roll Forward	A roll-forward of unrecognized tax benefits is as follows: June 30, 2018 2017 2016 Beginning of the year balance $ 6.4 $ 4.7 $ 1.9 Additions for current year tax positions 1.3 1.0 1.9 Additions for tax positions of prior years 0.7 1.2 1.1 Reductions for tax positions of prior years (0.8 ) — (0.1 ) Settlement with tax authorities (0.6 ) (0.2 ) — Expiration of the statute of limitations (0.8 ) (0.2 ) — Impact of foreign exchange rate fluctuations — (0.1 ) (0.1 ) End of year balance $ 6.2 $ 6.4 $ 4.7
Summary of Income Tax Examinations	Income tax-related examinations currently in progress in which the Company has significant business operations are as follows: Tax Jurisdictions Fiscal Years Ended New Jersey 6/30/2008 thru 6/30/2011 Canada 6/30/2012 thru 6/30/2014 Kuwait 6/30/2017 India 6/30/2015 thru 6/30/2016 Spain 6/30/2011 Italy 6/30/2014 thru 6/30/2016 Belgium 6/30/2015 thru 6/30/2017

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Summary of Components of Basic and Diluted Earnings per Share	The following table summarizes the components of basic and diluted earnings per share. June 30, 2018 2017 2016 Net earnings attributable to CDK $ 380.8 $ 295.6 $ 239.3 Weighted-average shares outstanding: Basic 135.8 146.7 157.0 Effect of employee stock options 0.3 0.7 0.5 Effect of employee restricted stock 0.7 0.8 0.5 Diluted 136.8 148.2 158.0 Basic earnings attributable to CDK per share $ 2.80 $ 2.01 $ 1.52 Diluted earnings attributable to CDK per share $ 2.78 $ 1.99 $ 1.51
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	The weighted-average number of shares outstanding used in the calculation of diluted earnings per share does not include the effect of the following anti-dilutive securities. June 30, 2018 2017 2016 Stock-based awards 0.2 0.3 0.5

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Schedule of Accounts Receivable, Net	Accounts receivable, net comprised of the following: June 30, 2018 2017 Trade receivables $ 374.5 $ 368.0 Lease receivables 7.5 10.4 Accounts receivable, gross 382.0 378.4 Less: allowances 7.4 6.3 Account receivable, net $ 374.6 $ 372.1 The investment in lease receivables consisted of the following: June 30, 2018 2017 Lease receivables, gross: Minimum lease payments $ 11.9 $ 23.4 Unearned income (0.6 ) (1.6 ) 11.3 21.8 Less: lease receivables, current (included in accounts receivable, net) 7.5 10.4 Lease receivables, long-term (included in other assets) $ 3.8 $ 11.4
Schedule of Minimum Payments on Lease Receivables	Scheduled minimum payments on lease receivables as of June 30, 2018 were as follows: Amount Fiscal year ending 2019 $ 7.9 Fiscal year ending 2020 3.6 Fiscal year ending 2021 0.3 Fiscal year ending 2022 0.1 Fiscal year ending 2023 — $ 11.9

Property, Plant and Equipment35

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The estimated useful lives of assets are primarily as follows: Buildings 20 to 40 years Furniture and fixtures 4 to 7 years Data processing equipment 2 to 5 years June 30, 2018 2017 Property, plant and equipment: Land and buildings $ 38.7 $ 39.4 Data processing equipment 241.8 215.5 Furniture and fixtures, leasehold improvements, and other 79.1 80.4 Total property, plant and equipment 359.6 335.3 Less: accumulated depreciation 227.7 200.3 Property, plant and equipment, net $ 131.9 $ 135.0

Goodwill and Intangible Asset36

Goodwill and Intangible Assets, Net (Tables)	12 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill	Changes in goodwill were as follows: Retail Solutions North America Advertising North America CDK International Total Balance as of June 30, 2016 $ 604.7 $ 214.3 $ 363.7 $ 1,182.7 Currency translation adjustments (0.1 ) — (1.4 ) (1.5 ) Balance as of June 30, 2017 604.6 214.3 362.3 1,181.2 Additions (Note 4) 19.0 11.3 — 30.3 Currency translation adjustments (0.3 ) — 6.0 5.7 Balance as of June 30, 2018 $ 623.3 $ 225.6 $ 368.3 $ 1,217.2
Components of Intangible Assets, Net	Components of intangible assets, net were as follows: June 30, 2018 2017 Original Cost Accumulated Amortization Intangible Assets, net Original Cost Accumulated Amortization Intangible Assets, net Customer lists $ 181.3 $ (142.4 ) $ 38.9 $ 175.5 $ (130.0 ) $ 45.5 Software 208.6 (124.3 ) 84.3 163.7 (109.4 ) 54.3 Trademarks 25.0 (24.6 ) 0.4 25.0 (24.1 ) 0.9 Other intangibles 6.9 (4.0 ) 2.9 6.4 (3.1 ) 3.3 $ 421.8 $ (295.3 ) $ 126.5 $ 370.6 $ (266.6 ) $ 104.0
Estimated Amortization Expenses of the Company's Existing Intangible Assets	Estimated amortization expenses of the Company's existing intangible assets as of June 30, 2018 were as follows: Amount Fiscal year ending 2019 $ 30.2 Fiscal year ending 2020 30.9 Fiscal year ending 2021 26.3 Fiscal year ending 2022 18.4 Fiscal year ending 2023 7.4 Thereafter 13.3 $ 126.5

Debt (Tables)

Debt (Tables)	12 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Debt	Debt comprised of the following: June 30, 2018 2017 Revolving credit facility $ — $ — 2019 term loan facility 203.1 215.6 2020 term loan facility 218.8 231.3 2021 term loan facility 370.0 390.0 3.30% senior notes, due 2019 250.0 250.0 4.50% senior notes, due 2024 500.0 500.0 5.875% senior notes due 2026 500.0 — 4.875% senior notes, due 2027 600.0 600.0 Capital lease obligations 0.2 1.5 Unamortized debt financing costs (21.4 ) (16.7 ) Total debt and capital lease obligations 2,620.7 2,171.7 Current maturities of long-term debt and capital lease obligations 45.2 46.5 Total long-term debt and capital lease obligations $ 2,575.5 $ 2,125.2
Aggregate Scheduled Maturities of Long-term Debt	The Company's aggregate scheduled maturities of the long-term debt and capital lease obligations as of June 30, 2018 were as follows: Amount Fiscal year ending 2019 $ 45.2 Fiscal year ending 2020 473.1 Fiscal year ending 2021 213.8 Fiscal year ending 2022 310.0 Fiscal year ending 2023 — Thereafter 1,600.0 Total debt and capital lease obligations 2,642.1 Unamortized deferred financing costs (21.4 ) Total debt and capital lease obligations, net of unamortized deferred financing costs $ 2,620.7

Commitments and Contingencies -

Commitments and Contingencies - (Tables)	12 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Minimum Commitments Under Operating Leases	The Company has obligations under various operating lease agreements for facilities and equipment. Total expense under these agreements was approximately $39.0 million , $46.0 million , and $49.3 million in fiscal 2018 , 2017 , and 2016 , respectively, with minimum commitments as of June 30, 2018 as follows: Amount Fiscal year ending 2019 $ 20.0 Fiscal year ending 2020 14.3 Fiscal year ending 2021 9.8 Fiscal year ending 2022 7.3 Fiscal year ending 2023 4.4 Thereafter 10.8 $ 66.6

Financial Data By Segment (Tabl

Financial Data By Segment (Tables)	12 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Financial Data by Segment The Company is organized into two main operating groups. The Company's first operating group is CDK North America which is comprised of two reportable segments, Retail Solutions North American and Advertising North America. The second operating group, which is also a reportable segment, is CDK International. The primary components of the Other segment are corporate allocations and other expenses not recorded in the segment results, such as stock-based compensation expense, corporate costs, interest expense, costs attributable to the business transformation plan, results of our captive insurance company and certain unallocated expenses. Certain expenses are charged to the reportable segments at a standard rate for management reasons. Other costs are recorded based on management responsibility. Retail Solutions North America Advertising North America CDK International Other Total Year ended June 30, 2018 Revenues $ 1,611.1 $ 305.8 $ 356.3 $ — $ 2,273.2 Earnings before income taxes 659.0 37.1 97.7 (281.8 ) 512.0 Assets 1,202.5 332.0 509.6 964.3 3,008.4 Capital expenditures 39.1 — 5.8 1.1 46.0 Depreciation and amortization 59.0 3.3 11.7 5.1 79.1 Year ended June 30, 2017 Revenues $ 1,600.7 $ 307.6 $ 311.9 $ — $ 2,220.2 Earnings before income taxes 605.5 44.4 75.0 (289.6 ) 435.3 Assets 1,231.1 312.1 538.9 801.0 2,883.1 Capital expenditures 51.6 — 7.8 3.0 62.4 Depreciation and amortization 48.2 3.1 11.4 7.6 70.3 Year ended June 30, 2016 Revenues $ 1,521.3 $ 279.7 $ 313.6 $ — $ 2,114.6 Earnings before income taxes 481.3 27.5 61.1 (200.8 ) 369.1 Assets 1,240.9 307.9 539.4 276.8 2,365.0 Capital expenditures 37.4 — 8.3 5.1 50.8 Depreciation and amortization 39.3 3.7 12.5 8.5 64.0 Supplemental disclosure of revenue by type was as follows: Retail Solutions North America: Subscription : for software and technology solutions provided to automotive retailers and OEMs, which includes: • DMSs and layered applications, which may be installed on-site at the customer’s location, or hosted and provided on a SaaS basis, including ongoing maintenance and support; • Interrelated services such as installation, initial training, and data updates; • Websites, search marketing, and reputation management services; and • Hardware on a service basis, meaning no specific assets are identified or a substantive right of substitution exists. Transaction : fees per transaction to process credit reports, vehicle registrations, and automotive equity mining. Other : consulting and professional services, sales of hardware, and other miscellaneous revenues. Advertising North America revenues are primarily earned for placing internet advertisements for OEMs and automotive retailers. CDK International revenues are generated primarily from Subscription revenue as described above, aside from the absence of website offerings. Revenues Years Ended June 30, 2018 2017 2016 CDK North America: Retail Solutions North America: Subscription revenue $ 1,306.3 $ 1,261.4 $ 1,191.2 Transaction revenue 164.0 179.5 179.1 Other revenue 140.8 159.8 151.0 Total Retail Solutions North America $ 1,611.1 $ 1,600.7 $ 1,521.3 Advertising North America revenue 305.8 307.6 279.7 CDK International revenue 356.3 311.9 313.6 Total $ 2,273.2 $ 2,220.2 $ 2,114.6 Revenues and property, plant and equipment, net by geographic area were as follows: United States Europe Canada Other Total Year ended June 30, 2018 Revenues $ 1,811.7 $ 253.3 $ 105.0 $ 103.2 $ 2,273.2 Property, plant and equipment, net 105.9 14.1 3.9 8.0 131.9 Year ended June 30, 2017 Revenues $ 1,808.9 $ 221.0 $ 99.2 $ 91.1 $ 2,220.2 Property, plant and equipment, net 104.5 16.3 3.7 10.5 135.0 Year ended June 30, 2016 Revenues $ 1,706.4 $ 227.8 $ 94.5 $ 85.9 $ 2,114.6 Property, plant and equipment, net 91.2 15.3 2.1 10.0 118.6
Schedule of Revenue and Earnings Before Taxes, by Segment	Retail Solutions North America Advertising North America CDK International Other Total Year ended June 30, 2018 Revenues $ 1,611.1 $ 305.8 $ 356.3 $ — $ 2,273.2 Earnings before income taxes 659.0 37.1 97.7 (281.8 ) 512.0 Assets 1,202.5 332.0 509.6 964.3 3,008.4 Capital expenditures 39.1 — 5.8 1.1 46.0 Depreciation and amortization 59.0 3.3 11.7 5.1 79.1 Year ended June 30, 2017 Revenues $ 1,600.7 $ 307.6 $ 311.9 $ — $ 2,220.2 Earnings before income taxes 605.5 44.4 75.0 (289.6 ) 435.3 Assets 1,231.1 312.1 538.9 801.0 2,883.1 Capital expenditures 51.6 — 7.8 3.0 62.4 Depreciation and amortization 48.2 3.1 11.4 7.6 70.3 Year ended June 30, 2016 Revenues $ 1,521.3 $ 279.7 $ 313.6 $ — $ 2,114.6 Earnings before income taxes 481.3 27.5 61.1 (200.8 ) 369.1 Assets 1,240.9 307.9 539.4 276.8 2,365.0 Capital expenditures 37.4 — 8.3 5.1 50.8 Depreciation and amortization 39.3 3.7 12.5 8.5 64.0 Supplemental disclosure of revenue by type was as follows: Retail Solutions North America: Subscription : for software and technology solutions provided to automotive retailers and OEMs, which includes: • DMSs and layered applications, which may be installed on-site at the customer’s location, or hosted and provided on a SaaS basis, including ongoing maintenance and support; • Interrelated services such as installation, initial training, and data updates; • Websites, search marketing, and reputation management services; and • Hardware on a service basis, meaning no specific assets are identified or a substantive right of substitution exists. Transaction : fees per transaction to process credit reports, vehicle registrations, and automotive equity mining. Other : consulting and professional services, sales of hardware, and other miscellaneous revenues. Advertising North America revenues are primarily earned for placing internet advertisements for OEMs and automotive retailers. CDK International revenues are generated primarily from Subscription revenue as described above, aside from the absence of website offerings. Revenues Years Ended June 30, 2018 2017 2016 CDK North America: Retail Solutions North America: Subscription revenue $ 1,306.3 $ 1,261.4 $ 1,191.2 Transaction revenue 164.0 179.5 179.1 Other revenue 140.8 159.8 151.0 Total Retail Solutions North America $ 1,611.1 $ 1,600.7 $ 1,521.3 Advertising North America revenue 305.8 307.6 279.7 CDK International revenue 356.3 311.9 313.6 Total $ 2,273.2 $ 2,220.2 $ 2,114.6
Long-lived Assets by Geographic Areas	Revenues and property, plant and equipment, net by geographic area were as follows: United States Europe Canada Other Total Year ended June 30, 2018 Revenues $ 1,811.7 $ 253.3 $ 105.0 $ 103.2 $ 2,273.2 Property, plant and equipment, net 105.9 14.1 3.9 8.0 131.9 Year ended June 30, 2017 Revenues $ 1,808.9 $ 221.0 $ 99.2 $ 91.1 $ 2,220.2 Property, plant and equipment, net 104.5 16.3 3.7 10.5 135.0 Year ended June 30, 2016 Revenues $ 1,706.4 $ 227.8 $ 94.5 $ 85.9 $ 2,114.6 Property, plant and equipment, net 91.2 15.3 2.1 10.0 118.6
Revenue from External Customers by Geographic Areas	Revenues and property, plant and equipment, net by geographic area were as follows: United States Europe Canada Other Total Year ended June 30, 2018 Revenues $ 1,811.7 $ 253.3 $ 105.0 $ 103.2 $ 2,273.2 Property, plant and equipment, net 105.9 14.1 3.9 8.0 131.9 Year ended June 30, 2017 Revenues $ 1,808.9 $ 221.0 $ 99.2 $ 91.1 $ 2,220.2 Property, plant and equipment, net 104.5 16.3 3.7 10.5 135.0 Year ended June 30, 2016 Revenues $ 1,706.4 $ 227.8 $ 94.5 $ 85.9 $ 2,114.6 Property, plant and equipment, net 91.2 15.3 2.1 10.0 118.6

Quarterly Financial Results (40

Quarterly Financial Results (Unaudited) (Tables)	12 Months Ended
	Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Summarized Quarterly Results of Operations	Summarized quarterly results of operations for the fiscal 2018 and 2017 were as follows: First Quarter Second Quarter Third Quarter Fourth Quarter Year ended June 30, 2018 Revenues $ 565.7 $ 561.7 $ 576.6 $ 569.2 Gross profit (1) 258.0 270.9 281.6 280.7 Earnings before income taxes 119.8 120.3 135.0 136.9 Net earnings 83.1 106.2 97.8 101.6 Net earnings attributable to noncontrolling interest 1.8 2.2 1.7 2.2 Net earnings attributable to CDK 81.3 104.0 96.1 99.4 Basic earnings attributable to CDK per share $ 0.58 $ 0.76 $ 0.71 $ 0.76 Diluted earnings attributable to CDK per share $ 0.57 $ 0.75 $ 0.71 $ 0.75 Year ended June 30, 2017 Revenues $ 550.7 $ 547.8 $ 556.3 $ 565.4 Gross profit (1) 235.6 244.6 248.6 256.5 Earnings before income taxes 111.9 118.9 110.4 94.1 Net earnings 79.2 83.6 78.8 60.9 Net earnings attributable to noncontrolling interest 2.3 0.9 1.5 2.2 Net earnings attributable to CDK 76.9 82.7 77.3 58.7 Basic earnings attributable to CDK per share $ 0.51 $ 0.56 $ 0.53 $ 0.41 Diluted earnings attributable to CDK per share $ 0.51 $ 0.55 $ 0.53 $ 0.41 (1) Gross profit is calculated as revenues less cost of revenues.

Basis of Presentation (Details)

Basis of Presentation (Details)	Sep. 30, 2014
Common Stock
Class of Stock [Line Items]
Shares of CDK distributed to ADP shareholders of record, common stock, in percentage	100.00%

Basis of Presentation Spin-Off

Basis of Presentation Spin-Off Common Stock Issued (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Correction of common stock issued in connection with the spin-off and dividends paid			$ 0.4
Number of shares issued previously reported in connection with the spin-off	136.8	148.2	158
Scenario, Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of shares issued previously reported in connection with the spin-off		160.6
Common Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Correction of common stock issued in connection with the spin-off and dividends paid			$ (1)
Common Stock | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Correction of common stock issued in connection with the spin-off and dividends paid (in shares)		1
Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Correction of common stock issued in connection with the spin-off and dividends paid		$ 0.4	$ 0.4

Summary of Significant Accoun43

Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Jun. 30, 2018USD ($)customer	Jun. 30, 2017USD ($)customer	Jun. 30, 2016USD ($)
Accounting Policies [Line Items]
Current deferred costs	$ 89.2	$ 94.4
Long-term deferred costs	95.7	115
Funds Receivable	33.1	25.7
Funds Held for Clients	12.7	7.9
Client Fund Obligations	45.8	33.6
Software, costs incurred prior to the establishment of technological feasibility	131.3	150	$ 161
Payments to Acquire Software	$ 41.1	$ 31.8	$ 13.5
Sales Revenue, Net
Accounting Policies [Line Items]
Concentration risk, number of customers | customer	1	1
Concentration risk, percentage	9.00%	11.00%	11.00%
Trade receivables
Accounting Policies [Line Items]
Concentration risk, percentage	11.00%	14.00%
Senior Notes
Accounting Policies [Line Items]
Long-term debt	$ 1,850	$ 1,350
Fair Value, Level 2 | Senior Notes
Accounting Policies [Line Items]
Approximate aggregate fair value of senior notes	$ 1,849.3	$ 1,407.9
Minimum
Accounting Policies [Line Items]
Amortization period of internal use software	3 years
Maximum
Accounting Policies [Line Items]
Amortization period of internal use software	5 years
Buildings | Minimum
Accounting Policies [Line Items]
Estimated useful lives	20 years
Buildings | Maximum
Accounting Policies [Line Items]
Estimated useful lives	40 years
Furniture and fixtures | Minimum
Accounting Policies [Line Items]
Estimated useful lives	4 years
Furniture and fixtures | Maximum
Accounting Policies [Line Items]
Estimated useful lives	7 years
Data processing equipment | Minimum
Accounting Policies [Line Items]
Estimated useful lives	2 years
Data processing equipment | Maximum
Accounting Policies [Line Items]
Estimated useful lives	5 years

New Accounting Pronouncements C

New Accounting Pronouncements Change in Accounting Principle (Details) - Accounting Standards Update 2014-09 $ in Millions	12 Months Ended
	Jun. 30, 2018USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement or change in accounting principle, effect of adoption, quantification	$ 150
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement or change in accounting principle, effect of adoption, quantification	$ 180

Acquisitions - Acquisitions Nar

Acquisitions - Acquisitions Narrative (Details) - USD ($) $ in Millions	Apr. 03, 2018	Oct. 20, 2017	Feb. 01, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Acquisitions
Business Combination, Integration Related Costs				$ 15.7	$ 0.7
Acquisitions
Cash purchase price				29	0	$ 18.1
Goodwill				$ 1,217.2	1,181.2	$ 1,182.7
Weighted average useful life				4 years
Progressus Media LLC [Member]
Acquisitions
Consideration transferred	$ 22.2
Cash purchase price	16.2
Holdback Liability	0.3
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	5.7
Contingent consideration, liability	1.6
Business Combination, Contingent Consideration, Liability, Noncurrent	4.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	8.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	2.2
Goodwill	$ 11.3
Weighted average useful life	9 years
Dashboard Dealership Enterprises [Member]
Acquisitions
Consideration transferred		$ 21.3
Cash purchase price		12.8
Holdback Liability		1.9
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		6.6
Contingent consideration, liability		7.6
Business Combination, Contingent Consideration, Liability, Noncurrent		0.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		3.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		1.6
Goodwill		$ 19
Weighted average useful life		8 years
RedBumper, LLC and NewCarIQ, LLC
Acquisitions
Consideration transferred			$ 32.4
Cash purchase price			17.7
Contingent consideration, liability			14.3
Contingent consideration payments					$ 0.4
Minimum contingent consideration payable			$ 14.7
Minimum contingent consideration payable period			4 years
Estimated fair value of acquired software intangible assets			$ 15
Estimated fair value of acquired other assets			0.6
Goodwill			$ 16.8
Weighted average useful life			8 years
Officer
Acquisitions
Consideration transferred	$ 0.5

Restructuring - Narrative (Deta

Restructuring - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring And Related Activities, Restructuring Period	3 years
Business transformation plan, period	1 year
Expected total restructuring expenses	$ 100			$ 70
Restructuring expenses	20.9	$ 18.4	$ 20.2
Recognized cumulative restructuring expenses	$ 61.9

Restructuring - Summary of Rest

Restructuring - Summary of Restructuring Expenses and Related Accruals (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Restructuring Reserve
Beginning Balance	$ 8.8	$ 9.9
Charges	22.6	19.3
Cash payments	(24.5)	(19.5)
Adjustments	(1.7)	(0.9)
Ending balance	5.2	8.8
Employee-Related Costs
Restructuring Reserve
Beginning Balance	6.4	9
Charges	20.8	14.5
Cash payments	(21.5)	(16.5)
Adjustments	(1.3)	(0.6)
Ending balance	4.4	6.4
Contract Termination Costs
Restructuring Reserve
Beginning Balance	2.4	0.9
Charges	1.8	4.8
Cash payments	(3)	(3)
Adjustments	(0.4)	(0.3)
Ending balance	$ 0.8	$ 2.4

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	Oct. 01, 2014USD ($)$ / sharesshares	Jun. 30, 2018USD ($)$ / sharesshares	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense		$ 35.7	$ 55.4	$ 36.4
Proceeds from exercise of stock options		8.9	14.7	6.7
Officer
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incremental stock-based compensation expense		1.5	3.1
Chief Executive Officer
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incremental stock-based compensation expense				3.5
Equity Classified Awards Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense		30.1	46.8	31.4
Liability Classified Awards Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense		$ 5.6	8.6	5
Employee Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options granted (shares) | shares		25,000
Options exercised (usd per share) | $ / shares		$ 26.77
Award expiration term		10 years
Total remaining unrecognized compensation cost		$ 1.7
Weighted-average remaining requisite vesting period		1 year 9 months 18 days
Proceeds from exercise of stock options		$ 8.9	14.7	6.7
Aggregate intrinsic value of stock options exercised		$ 14	$ 26	$ 12.4
Risk-free interest rate		2.00%	1.40%	1.80%
Time-Based Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares granted during period (shares) | shares		184,000
Time-Based Restricted Stock and Time-Based Restricted Stock Units | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting period		2 years
Time-Based Restricted Stock and Time-Based Restricted Stock Units | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting period		5 years
Performance-Based Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares granted during period (shares) | shares		236,000
Stock-based compensation expense			$ 11.9
Performance-Based Restricted Stock Units | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting based on performance period and targets, percentage		0.00%
Performance-Based Restricted Stock Units | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting period		3 years
Award vesting based on performance period and targets, percentage		250.00%
Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost		$ 16.7
Weighted-average remaining requisite vesting period		1 year 7 months 6 days
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost		$ 8
Weighted-average remaining requisite vesting period		1 year 2 months 12 days
2014 Omnibus Award Plan | Stock Compensation Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares authorized (shares) | shares		12,000,000
Award expiration term		10 years
Shares available for issuance (shares) | shares		5,300,000
Spinoff
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Conversion of existing equity awards to new awards, ratio	2.757
Converted equity awards, change in fair value	$ 1.4
Spinoff | Employee Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options granted (shares) | shares	2,300,000
Options exercised (usd per share) | $ / shares	$ 19.64
Spinoff | Time-Based Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares granted during period (shares) | shares	700,000
Spinoff | Performance-Based Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares granted during period (shares) | shares	200,000

Stock-Based Compensation - Comp

Stock-Based Compensation - Components Of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Pre-tax stock-based compensation expense	$ 35.7	$ 55.4	$ 36.4
Income tax benefit	10.5	19.4	12.9
Cost of revenues
Defined Benefit Plan Disclosure [Line Items]
Pre-tax stock-based compensation expense	4.9	6.3	6.2
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Pre-tax stock-based compensation expense	$ 30.8	$ 49.1	$ 30.2

Stock-Based Compensation - Acti

Stock-Based Compensation - Activity Related to Incentive Equity Awards, Stock Options (Details) - Employee Stock Option $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares
Number of Options (in thousands)
Options outstanding as of June 30, 2017 | shares	1,310
Options granted (shares) | shares	25
Options exercised (shares) | shares	(334)
Options canceled (shares) | shares	(44)
Options outstanding as of June 30, 2018 | shares	957
Weighted-Average Exercise Price (in dollars)
Options outstanding as of June 30, 2017 | $ / shares	$ 39.70
Options granted (usd per share) | $ / shares	62.03
Options exercised (usd per share) | $ / shares	26.77
Options canceled (usd per share) | $ / shares	51.77
Options outstanding as of June 30, 2018 | $ / shares	$ 44.25
Options, Additional Disclosures
Options outstanding at end of period, weighted average remaining contractual life	6 years 8 months 12 days
Options outstanding at end of period, aggregate intrinsic value | $	$ 19.9
Options exercisable as of end of period, number of options (shares) | shares	532
Options exercisable as of end of period, weighted average exercise price (usd per share) | $ / shares	$ 34.55
Options exercisable as of end of period, weighted average remaining contractual life	5 years 7 months 6 days
Options exercisable as of end of period, aggregate intrinsic value | $	$ 16.2

Stock-Based Compensation - Ac51

Stock-Based Compensation - Activity Related to Incentive Equity Awards, Restricted Stock Units (Details) $ / shares in Units, shares in Thousands	12 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares
Time-Based Restricted Stock
Restricted Stock and Restricted Stock Units (in shares)
Non-vested restricted shares/units as of June 30, 2017	497
Restricted shares/units granted (shares)	184
Restricted shares/units vested (shares)	(230)
Restricted shares/units forfeited (shares)	(72)
Non-vested restricted shares/units as of June 30, 2018	379
Weighted Average Grant Date Fair Value (usd per share)
Non-vested restricted shares/units as of June 30, 2017 | $ / shares	$ 53.98
Restricted shares/units granted (usd per share) | $ / shares	63.71
Restricted shares/units vested (usd per share) | $ / shares	50.23
Restricted shares/units forfeited (usd per share) | $ / shares	58.66
Non-vested restricted shares/units as of June 30, 2018 | $ / shares	$ 60.14
Time-Based Restricted Stock Units
Restricted Stock and Restricted Stock Units (in shares)
Non-vested restricted shares/units as of June 30, 2017	214
Restricted shares/units granted (shares)	79
Restricted shares/units vested (shares)	(138)
Restricted shares/units forfeited (shares)	(13)
Non-vested restricted shares/units as of June 30, 2018	142
Weighted Average Grant Date Fair Value (usd per share)
Non-vested restricted shares/units as of June 30, 2017 | $ / shares	$ 66.17
Restricted shares/units granted (usd per share) | $ / shares	64.86
Restricted shares/units vested (usd per share) | $ / shares	50.12
Restricted shares/units forfeited (usd per share) | $ / shares	58.65
Non-vested restricted shares/units as of June 30, 2018 | $ / shares	$ 58.55
Performance-Based Restricted Stock Units
Restricted Stock and Restricted Stock Units (in shares)
Non-vested restricted shares/units as of June 30, 2017	742
Restricted shares/units granted (shares)	236
Dividend equivalents (shares)	7
Restricted shares/units vested (shares)	(513)
Restricted shares/units forfeited (shares)	(61)
Non-vested restricted shares/units as of June 30, 2018	411
Weighted Average Grant Date Fair Value (usd per share)
Non-vested restricted shares/units as of June 30, 2017 | $ / shares	$ 65.41
Restricted shares/units granted (usd per share) | $ / shares	$ 52.36
Dividend equivalents (usd per share) | $	$ 57.53
Restricted shares/units vested (usd per share) | $ / shares	$ 50.38
Restricted shares/units forfeited (usd per share) | $ / shares	59.33
Non-vested restricted shares/units as of June 30, 2018 | $ / shares	$ 63.26

Stock-Based Compensation - Assu

Stock-Based Compensation - Assumptions Used To Estimate Fair Value For Stock Options Granted (Details) - Employee Stock Option - $ / shares	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Assumptions used
Risk-free interest rate	2.00%	1.40%	1.80%
Dividend yield	0.90%	0.90%	0.90%
Weighted-average volatility factor	24.50%	24.50%	24.70%
Weighted-average expected life (in years)	6 years 3 months 18 days	6 years 3 months 18 days	6 years 3 months 18 days
Weighted-average fair value (in dollars) (usd per share)	$ 15.65	$ 13.90	$ 12.55

Employee Benefit Plans - Define

Employee Benefit Plans - Defined Contribution Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Domestic Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, recorded costs	$ 16.9	$ 18.7	$ 18.9
Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, recorded costs	$ 15.8	$ 14.8	$ 14.1

Income Taxes - Tax Matters Agre

Income Taxes - Tax Matters Agreement (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)	$ 3.6		$ 14.1	$ 18.5
Tax Cuts and Jobs Act of 2017, Deferred tax re-measurement, Income Tax Expense (Benefit)	2.8	$ 0.8		26.2
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit)		$ (3.4)
Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings,Income Tax Expense (Benefit)	0.8			$ (4.3)
Provision for taxes at U.S. statutory rate				28.10%	35.00%	35.00%
Increase in Unrecognized Tax Benefits is Reasonably Possible	1			$ 1
Adjustment in valuation allowance				13.5	$ 1.1
Earnings of foreign subsidiaries no longer indefinitely reinvested			$ 244
ADP | Income Tax
Related Party Transaction [Line Items]
Receivables from ADP	0.5			0.5	1
Payables to ADP	0.9			0.9	$ 1.2
Capital Losses From Disposal | Domestic
Related Party Transaction [Line Items]
Capital loss	75.4			75.4
Capital Losses From Disposal | State
Related Party Transaction [Line Items]
Capital loss	$ 75.4			75.4
Tax Cuts and Jobs Act of 2017, Change in Tax Rate
Related Party Transaction [Line Items]
Adjustment in valuation allowance				(10)
expiration of tax loss carryforward
Related Party Transaction [Line Items]
Adjustment in valuation allowance				$ (3.5)

Income Taxes - Earnings before

Income Taxes - Earnings before Income Taxes by Geographic Location (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Earnings before income taxes:
U.S.	$ 367.3	$ 324.9	$ 293.1
Foreign	144.7	110.4	76
Total earnings before income taxes:	$ 512	$ 435.3	$ 369.1

Income Taxes - Components of In

Income Taxes - Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Current:
Federal	$ 76.6	$ 69.6	$ 84.9
Foreign	35.8	27.5	24.5
State	21	14.8	16.5
Total current	133.4	111.9	125.9
Deferred:
Federal	(14.7)	17	(3.3)
Foreign	2.9	2	1.3
State	1.7	1.9	(1.6)
Total deferred	(10.1)	20.9	(3.6)
Total provision for income taxes	$ 123.3	$ 132.8	$ 122.3

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Amount
Provision for taxes at U.S. statutory rate	$ 143.9	$ 152.4	$ 129.2
State taxes, net of federal benefit	17.3	10.8	9.7
Stock compensation - excess tax benefits	(4.9)	(12)	0
Noncontrolling interest	(1.8)	(2)	(2.5)
Foreign tax rate differential	(2.2)	(12.4)	(7.8)
U.S. tax on foreign earnings	19	1.1	0.8
Foreign tax credits	(18.3)	(1.9)	(1.5)
Foreign tax credits	4.5	0	0
U.S. tax reform deferred tax re-measurement	(27.3)	0	0
Valuation allowances	(3.6)	0.8	1.1
Domestic production activities deduction	(4)	(4.2)	(6.4)
Pre spin-off tax return adjustments	(0.4)	0	(0.4)
Other	1.1	0.2	0.1
Total provision for income taxes	$ 123.3	$ 132.8	$ 122.3
Effective Income Tax Rate Reconciliation, Percent
Provision for taxes at U.S. statutory rate	28.10%	35.00%	35.00%
State taxes, net of federal benefit	3.40%	2.50%	2.60%
Stock compensation - excess tax benefits	(1.00%)	(2.80%)	0.00%
Noncontrolling interest	(0.40%)	(0.50%)	(0.70%)
Foreign tax rate differential	(0.40%)	(2.80%)	(2.10%)
U.S. tax on foreign earnings	3.70%	0.30%	0.20%
Foreign tax credits	(3.60%)	(0.40%)	(0.40%)
Foreign withholding taxes	0.90%	0.00%	0.00%
U.S. tax reform deferred tax re-measurement	(5.30%)	0.00%	0.00%
Valuation allowances	(0.70%)	0.20%	0.30%
Domestic production activities deduction	(0.80%)	(1.00%)	(1.70%)
Pre spin-off tax return adjustments	(0.10%)	0.00%	(0.10%)
Other	0.30%	0.00%	0.00%
Effective income tax reconciliation, percent	24.10%	30.50%	33.10%

Income Taxes - Balance Sheet Cl

Income Taxes - Balance Sheet Classification and Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Classification:
Long term deferred tax assets (included in other assets)	$ 21.9	$ 22.1
Long term deferred tax liabilities (included in deferred income taxes)	(56.7)	(65.9)
Net deferred tax liabilities	(34.8)	(43.8)
Deferred tax assets:
Accrued expenses	8.3	13.9
Compensation and benefits	32.7	46.1
Deferred revenue	44.4	53.8
Net operating losses	5.5	10.5
Capital losses	18.8	28.8
Deferred tax assets	109.7	153.1
Less: valuation allowances	(21.6)	(35.1)
Net deferred tax assets	88.1	118
Deferred tax liabilities:
Deferred expenses	46.7	64.9
Property, plant and equipment and intangible assets	70.1	92.1
Prepaid expenses	2	2.6
Undistributed foreign earnings	2.8	0
Other	1.3	2.2
Deferred tax liabilities	122.9	161.8
Net deferred tax liabilities	$ (34.8)	$ (43.8)

Income Taxes - Operating Loss C

Income Taxes - Operating Loss Carryforward Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Operating Loss Carryforwards [Line Items]
Earnings of foreign subsidiaries no longer indefinitely reinvested	$ 244
Aggregate undistributed foreign earnings		$ 115
Valuation allowances		21.6	$ 35.1
Adjustment in valuation allowance		(13.5)	(1.1)
Income tax payments, net		118.9	$ 120.3	$ 109.4
Domestic | Capital Losses From Disposal
Operating Loss Carryforwards [Line Items]
Capital loss		75.4
State | Capital Losses From Disposal
Operating Loss Carryforwards [Line Items]
Capital loss		75.4
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss		20.4
Operating loss carryforward expiring between 2017 and 2035		3
Operating loss carryforwards, not subject to expiration		$ 17.4

Income Taxes - Unrecognized Inc

Income Taxes - Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Unrecognized Income Tax Benefits
Beginning of the year balance	$ 6.4	$ 4.7	$ 1.9
Additions for current year tax positions	1.3	1	1.9
Additions for tax positions of prior years	0.7	1.2	1.1
Reductions for tax positions of prior years	(0.8)	0	(0.1)
Settlement with tax authorities	(0.6)	(0.2)	0
Expiration of the statute of limitations	(0.8)	(0.2)	0
Impact of foreign exchange rate fluctuations	0	(0.1)	(0.1)
End of year balance	$ 6.2	$ 6.4	$ 4.7

Income Taxes - Unrecognized I61

Income Taxes - Unrecognized Income Tax Benefits Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 6.2	$ 6.4	$ 4.7	$ 1.9
Unrecognized tax benefits that would impact effective tax rate, if recognized	5.3	4.8	3.6
Unrecognized tax benefits, period increase	(0.2)	$ 1.7	$ 2.8
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 1

Earnings per Share - Components

Earnings per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net earnings attributable to CDK	$ 99.4	$ 96.1	$ 104	$ 81.3	$ 58.7	$ 77.3	$ 82.7	$ 76.9	$ 380.8	$ 295.6	$ 239.3
Weighted-average shares outstanding:
Basic (shares)									135.8	146.7	157
Effect of employee stock options (shares)									0.3	0.7	0.5
Effect of employee restricted stock (shares)									0.7	0.8	0.5
Diluted (shares)									136.8	148.2	158
Basic earnings attributable to CDK per share (in usd per share)	$ 0.76	$ 0.71	$ 0.76	$ 0.58	$ 0.41	$ 0.53	$ 0.56	$ 0.51	$ 2.80	$ 2.01	$ 1.52
Diluted earnings attributable to CDK per share (in usd per share)	$ 0.75	$ 0.71	$ 0.75	$ 0.57	$ 0.41	$ 0.53	$ 0.55	$ 0.51	$ 2.78	$ 1.99	$ 1.51

Earnings per Share Antidilutive

Earnings per Share Antidilutive Securities Excluded from Computation of Earnings per Share (Details) - shares shares in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock-based awards	0.2	0.3	0.5

Accounts Receivable, Net - Sche

Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Accounts receivable
Accounts receivable, gross	$ 382	$ 378.4
Less: allowances	7.4	6.3
Account receivable, net	374.6	372.1
Lease Receivable
Minimum lease payments	11.9	23.4
Unearned income	(0.6)	(1.6)
Lease receivables, gross:	11.3	21.8
Trade receivables
Accounts receivable
Accounts receivable, gross	374.5	368
Lease receivables
Accounts receivable
Accounts receivable, gross	7.5	10.4
Lease Receivable
Less: lease receivables, current (included in accounts receivable, net)	7.5	10.4
Lease receivables, long-term (included in other assets)	$ 3.8	$ 11.4

Accounts Receivable, Net - Sc65

Accounts Receivable, Net - Schedule of Future Minimum Lease Payments Receivable (Details) $ in Millions	Jun. 30, 2018USD ($)
Receivables [Abstract]
Fiscal year ending 2019	$ 7.9
Fiscal year ending 2020	3.6
Fiscal year ending 2021	0.3
Fiscal year ending 2022	0.1
Fiscal year ending 2023	0
Total minimum lease payments receivable	$ 11.9

Accounts Receivable, Net - Addi

Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Interest income on sales-type leases	$ 1	$ 1.8	$ 2.4

Property, Plant and Equipment67

Property, Plant and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$ 47.8	$ 40.7	$ 35.1

Property, Plant and Equipment68

Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 359.6	$ 335.3
Less: accumulated depreciation	227.7	200.3
Property, plant and equipment, net	131.9	135	$ 118.6
Land and buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	38.7	39.4
Data processing equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	241.8	215.5
Furniture and fixtures, leasehold improvements, and other
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 79.1	$ 80.4

Goodwill and Intangible Asset69

Goodwill and Intangible Assets, Net - Changes In Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Changes in Goodwill
Beginning balance	$ 1,181.2	$ 1,182.7
Additions (Note 4)	30.3
Currency translation adjustments	5.7	(1.5)
Ending balance	1,217.2	1,181.2
Retail Solutions North America
Changes in Goodwill
Beginning balance	604.6	604.7
Currency translation adjustments	(0.3)	(0.1)
Ending balance	623.3	604.6
Advertising North America
Changes in Goodwill
Beginning balance	214.3	214.3
Additions (Note 4)	11.3
Currency translation adjustments	0	0
Ending balance	225.6	214.3
CDK International
Changes in Goodwill
Beginning balance	362.3	363.7
Additions (Note 4)	0
Currency translation adjustments	6	(1.4)
Ending balance	368.3	$ 362.3
Automotive Retail Solutions North America [Member]
Changes in Goodwill
Additions (Note 4)	$ 19

Goodwill and Intangible Asset70

Goodwill and Intangible Assets, Net - Components Of Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 421.8	$ 370.6
Accumulated Amortization	(295.3)	(266.6)
Intangible Assets, net	126.5	104
Customer lists
Finite-Lived Intangible Assets [Line Items]
Original Cost	181.3	175.5
Accumulated Amortization	(142.4)	(130)
Intangible Assets, net	38.9	45.5
Software
Finite-Lived Intangible Assets [Line Items]
Original Cost	208.6	163.7
Accumulated Amortization	(124.3)	(109.4)
Intangible Assets, net	84.3	54.3
Trademarks
Finite-Lived Intangible Assets [Line Items]
Original Cost	25	25
Accumulated Amortization	(24.6)	(24.1)
Intangible Assets, net	0.4	0.9
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Original Cost	6.9	6.4
Accumulated Amortization	(4)	(3.1)
Intangible Assets, net	$ 2.9	$ 3.3

Goodwill and Intangible Asset71

Goodwill and Intangible Assets, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 31.3	$ 29.6	$ 28.9
Weighted average remaining useful life	4 years
Customer lists
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	7 years
Software
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	3 years
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	2 years

Goodwill and Intangible Asset72

Goodwill and Intangible Assets, Net - Schedule Of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Fiscal year ending 2019	$ 30.2
Fiscal year ending 2020	30.9
Fiscal year ending 2021	26.3
Fiscal year ending 2022	18.4
Fiscal year ending 2023	7.4
Thereafter	13.3
Intangible Assets, net	$ 126.5	$ 104

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 18, 2018	Jun. 30, 2017	May 15, 2017	Oct. 15, 2016	Oct. 14, 2014
Debt Instrument [Line Items]
Unamortized debt financing costs	$ (21.4)		$ (16.7)
Total debt and capital lease obligations	2,620.7		2,171.7
Current maturities of long-term debt and capital lease obligations	45.2		46.5
Total long-term debt and capital lease obligations	2,575.5		2,125.2
Line of Credit | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	0		0
Term loan facilities | 2019 term loan facility
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	203.1		215.6
Term loan facilities | 2020 term loan facility
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	218.8		231.3
Term loan facilities | 2021 term loan facility
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	370		390
Senior Notes | 3.30% senior notes, due 2019
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	$ 250		$ 250
Interest rate	3.80%		3.30%		3.80%	3.30%
Senior Notes | 4.50% senior notes, due 2024
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	$ 500		$ 500
Interest rate	5.00%		4.50%		5.00%	4.50%
Senior Notes | 5.875 senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	$ 500		$ 0
Interest rate	5.875%	5.875%
Senior Notes | 4.875% senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	$ 600		600
Interest rate	4.875%			4.875%
Capital Lease Obligations
Debt Instrument [Line Items]
Long-term debt and capital lease obligations, gross	$ 0.2		$ 1.5

Debt - Narrative (Details)

Debt - Narrative (Details)	Jun. 18, 2018USD ($)	May 15, 2017USD ($)	Dec. 09, 2016USD ($)	Dec. 14, 2015USD ($)	Oct. 14, 2014USD ($)	Sep. 16, 2014USD ($)extension	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Oct. 15, 2016
Debt Instrument [Line Items]
Maximum ratio of indebtedness to EBITDA						350.00%
Minimum ratio of EBITDA to Interest expense						300.00%
Debt issuance costs, gross							$ 29,600,000	$ 21,700,000
Accumulated amortization of debt financing costs							(8,200,000)	(5,000,000)
Additional debt issuance costs capitalized							$ 7,900,000	$ 10,600,000	$ 2,100,000
2021 term loan facility | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit			0.50%
2021 term loan facility | One-Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit			1.00%
2021 term loan facility | Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit			1.25%
2021 term loan facility | Minimum | One-Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit			0.25%
2021 term loan facility | Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit			2.50%
2021 term loan facility | Maximum | One-Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit			1.50%
Line of Credit | Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity						$ 300,000,000
Revolving credit facility, Euro or Sterling sublimit						100,000,000
Line of credit facility accordion feature						$ 100,000,000
Line of credit, number of one-year extensions | extension						2
Revolving credit facility term extension period						1 year
Line of Credit | Revolving credit facility | Prime Rate | JP Morgan Chase Bank
Debt Instrument [Line Items]
Description of variable rate basis, line of credit						prime rate
Line of Credit | Revolving credit facility | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit						0.50%
Description of variable rate basis, line of credit						federal funds rate
Line of Credit | Revolving credit facility | One-Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit						1.00%
Line of Credit | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage on unused portion of the revolving credit facility						0.125%
Line of Credit | Revolving credit facility | Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit						1.125%
Line of Credit | Revolving credit facility | Minimum | One-Month LIBOR
Debt Instrument [Line Items]
Additional basis spread on variable rate, line of credit						0.125%
Line of Credit | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage on unused portion of the revolving credit facility						0.35%
Line of Credit | Revolving credit facility | Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, line of credit						2.00%
Line of Credit | Revolving credit facility | Maximum | One-Month LIBOR
Debt Instrument [Line Items]
Additional basis spread on variable rate, line of credit						1.00%
Term loan facilities
Debt Instrument [Line Items]
Debt instrument, number of loans | loan							2
Periodic payment of principal, in percentage, term loan						1.25%
Term loan facilities | 2019 term loan facility
Debt Instrument [Line Items]
Debt instrument, term						5 years
Debt instrument, face amount						$ 250,000,000
Annual interest rate on loan facility							3.85%	2.98%
Term loan facilities | 2021 term loan facility
Debt Instrument [Line Items]
Debt instrument, term			5 years
Debt instrument, face amount			$ 400,000,000
Annual interest rate on loan facility							3.85%
Term loan facilities | 2020 term loan facility
Debt Instrument [Line Items]
Debt instrument, term				5 years
Debt instrument, face amount				$ 250,000,000
Annual interest rate on loan facility							3.85%	2.98%
Credit Facilities | Maximum
Debt Instrument [Line Items]
Maximum aggregate principal amount of accelerated maturity of other indebtedness allowed						$ 75,000,000
Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount					100.00%
Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount					100.00%
Senior Notes | Minimum
Debt Instrument [Line Items]
Notes, redemption price resulting from change of control, as percentage of principal amount					101.00%
Senior Notes | 3.30% senior notes, due 2019
Debt Instrument [Line Items]
Debt instrument, face amount					$ 250,000,000
Interest rate					3.30%		3.80%	3.30%		3.80%
Senior Notes | 4.50% senior notes, due 2024
Debt Instrument [Line Items]
Debt instrument, face amount					$ 500,000,000
Interest rate					4.50%		5.00%	4.50%		5.00%
Senior Notes | 4.875% senior notes, due 2027
Debt Instrument [Line Items]
Debt instrument, face amount		$ 600,000,000
Senior Notes | 4.875% senior notes, due 2027 | Minimum | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount		100.00%
Senior Notes | 4.875% senior notes, due 2027 | Minimum | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount		102.438%
Senior Notes | 4.875% senior notes, due 2027 | Minimum | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount		101.625%
Senior Notes | 4.875% senior notes, due 2027 | Minimum | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount		100.813%
Senior Notes | 4.875% senior notes, due 2027 | Minimum | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount		100.00%
Senior Notes | 5.875 senior notes, due 2026
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000
Interest rate	5.875%						5.875%
Senior Notes | 5.875 senior notes, due 2026 | Minimum | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount	100.00%
Senior Notes | 5.875 senior notes, due 2026 | Minimum | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount	102.938%
Senior Notes | 5.875 senior notes, due 2026 | Minimum | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount	101.958%
Senior Notes | 5.875 senior notes, due 2026 | Minimum | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount	100.979%
Senior Notes | 5.875 senior notes, due 2026 | Minimum | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Notes, redemption price as a percentage of the aggregate principal amount	100.00%

Debt - Schedule of Maturities (

Debt - Schedule of Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Debt Disclosure [Abstract]
Fiscal year ending 2019	$ 45.2
Fiscal year ending 2020	473.1
Fiscal year ending 2021	213.8
Fiscal year ending 2022	310
Fiscal year ending 2023	0
Thereafter	1,600
Total debt and capital lease obligations	2,642.1
Unamortized deferred financing costs	(21.4)	$ (16.7)
Total debt and capital lease obligations	$ 2,620.7	$ 2,171.7

Commitments and Contingencies76

Commitments and Contingencies - Minimum Commitments Under Operating Leases (Details) $ in Millions	Jun. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Fiscal year ending 2019	$ 20
Fiscal year ending 2020	14.3
Fiscal year ending 2021	9.8
Fiscal year ending 2022	7.3
Fiscal year ending 2023	4.4
Thereafter	10.8
Operating leases, total minimum commitments	$ 66.6

Commitments and Contingencies77

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating leases expense	$ 39	$ 46	$ 49.3
Purchase commitments and obligation	0
Surety Bonds Outstanding Amount	26.1
Letters of Credit Outstanding, Amount	$ 2

Accumulated Other Comprehensi78

Accumulated Other Comprehensive Income ("AOCI") Accumulated Other Comprehensive Income ("AOCI") (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Other comprehensive income (loss)	$ 3.5	$ 2.2	$ (45.8)
Currency translation adjustments, accumulated balances	$ 11.5	$ 8	$ 5.8

Share Repurchase Transactions (

Share Repurchase Transactions (Details) - USD ($)

Sep. 12, 2017

May 16, 2017

May 08, 2017

Dec. 12, 2016

Sep. 12, 2016

Jun. 16, 2016

Jun. 15, 2016

Dec. 15, 2015

Sep. 12, 2016

Sep. 12, 2017

May 08, 2017

Jun. 15, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Equity, Class of Treasury Stock [Line Items]

Payments for Repurchase of Common Stock

$ 623,600,000

$ 700,000,000

$ 561,000,000

Repurchase Authorization 2016

Equity, Class of Treasury Stock [Line Items]

Stock repurchase program, authorized amount

1,000,000,000

Payments for Repurchase of Common Stock

$ 623,600,000

$ 20,000,000

Treasury Stock, Shares, Acquired

9,400,000

300,000

Repurchase Authorization 2017

Equity, Class of Treasury Stock [Line Items]

Stock repurchase program, authorized amount

$ 2,000,000,000

December 2015 ASR

Equity, Class of Treasury Stock [Line Items]

Payments for Repurchase of Common Stock

$ 250,000,000

Treasury Stock, Shares, Acquired

1,000,000

4,300,000

5,300,000

Value of treasury stock over cash settlement

6,200,000

June 2016 ASR

Equity, Class of Treasury Stock [Line Items]

Payments for Repurchase of Common Stock

$ 300,000,000

Treasury Stock, Shares, Acquired

1,000,000

4,300,000

5,300,000

Value of treasury stock over cash settlement

(3,100,000)

December 2016 ASR

Equity, Class of Treasury Stock [Line Items]

Payments for Repurchase of Common Stock

$ 330,000,000

Treasury Stock, Shares, Acquired

700,000

4,500,000

5,200,000

Value of treasury stock over cash settlement

21,200,000

May 2017 ASR

Equity, Class of Treasury Stock [Line Items]

Payments for Repurchase of Common Stock

$ 350,000,000

Treasury Stock, Shares, Acquired

1,100,000

4,500,000

5,600,000

Value of treasury stock over cash settlement

$ 3,100,000

Transactions with ADP (Details)

Transactions with ADP (Details) - USD ($) $ in Millions	Sep. 29, 2014	Jun. 30, 2015	Jun. 30, 2017
Transition Services
Related Party Transaction [Line Items]
Transition expenses			$ 2.2
Data Services
Related Party Transaction [Line Items]
Transition expenses		$ 7.5	$ 3.4
Data Services | ADP
Related Party Transaction [Line Items]
Term of agreement	2 years

Financial Data By Segment - Rev

Financial Data By Segment - Revenue and Earnings Before Taxes by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 569.2	$ 576.6	$ 561.7	$ 565.7	$ 565.4	$ 556.3	$ 547.8	$ 550.7	$ 2,273.2	$ 2,220.2	$ 2,114.6
Earnings before income taxes	136.9	$ 135	$ 120.3	$ 119.8	94.1	$ 110.4	$ 118.9	$ 111.9	512	435.3	369.1
Assets	3,008.4				2,883.1				3,008.4	2,883.1	2,365
Capital expenditures									46	62.4	50.8
Depreciation and amortization									79.1	70.3	64
Property, plant and equipment, net	131.9				135				131.9	135	118.6
United States
Segment Reporting Information [Line Items]
Revenues									1,811.7	1,808.9	1,706.4
Property, plant and equipment, net	105.9				104.5				105.9	104.5	91.2
Europe
Segment Reporting Information [Line Items]
Revenues									253.3	221	227.8
Property, plant and equipment, net	14.1				16.3				14.1	16.3	15.3
Canada
Segment Reporting Information [Line Items]
Revenues									105	99.2	94.5
Property, plant and equipment, net	3.9				3.7				3.9	3.7	2.1
Other
Segment Reporting Information [Line Items]
Revenues									103.2	91.1	85.9
Property, plant and equipment, net	8				10.5				8	10.5	10
Retail Solutions North America
Segment Reporting Information [Line Items]
Subscription revenue									1,306.3	1,261.4	1,191.2
Transaction revenue									164	179.5	179.1
Other revenue									140.8	159.8	151
Retail Solutions North America | Operating Segments
Segment Reporting Information [Line Items]
Revenues									1,611.1	1,600.7	1,521.3
Earnings before income taxes									659	605.5	481.3
Assets	1,202.5				1,231.1				1,202.5	1,231.1	1,240.9
Capital expenditures									39.1	51.6	37.4
Depreciation and amortization									59	48.2	39.3
Advertising North America | Operating Segments
Segment Reporting Information [Line Items]
Revenues									305.8	307.6	279.7
Earnings before income taxes									37.1	44.4	27.5
Assets	332				312.1				332	312.1	307.9
Capital expenditures									0	0	0
Depreciation and amortization									3.3	3.1	3.7
CDK International | Operating Segments
Segment Reporting Information [Line Items]
Revenues									356.3	311.9	313.6
Earnings before income taxes									97.7	75	61.1
Assets	509.6				538.9				509.6	538.9	539.4
Capital expenditures									5.8	7.8	8.3
Depreciation and amortization									11.7	11.4	12.5
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues									0	0	0
Earnings before income taxes									(281.8)	(289.6)	(200.8)
Assets	$ 964.3				$ 801				964.3	801	276.8
Capital expenditures									1.1	3	5.1
Depreciation and amortization									$ 5.1	$ 7.6	$ 8.5

Quarterly Financial Results (82

Quarterly Financial Results (Unaudited) - Summarized Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 569.2	$ 576.6	$ 561.7	$ 565.7	$ 565.4	$ 556.3	$ 547.8	$ 550.7	$ 2,273.2	$ 2,220.2	$ 2,114.6
Gross profit	280.7	281.6	270.9	258	256.5	248.6	244.6	235.6
Earnings before income taxes	136.9	135	120.3	119.8	94.1	110.4	118.9	111.9	512	435.3	369.1
Net earnings	101.6	97.8	106.2	83.1	60.9	78.8	83.6	79.2	388.7	302.5	246.8
Net earnings attributable to noncontrolling interest	2.2	1.7	2.2	1.8	2.2	1.5	0.9	2.3	7.9	6.9	7.5
Net earnings attributable to CDK	$ 99.4	$ 96.1	$ 104	$ 81.3	$ 58.7	$ 77.3	$ 82.7	$ 76.9	$ 380.8	$ 295.6	$ 239.3
Basic earnings attributable to CDK per share (in usd per share)	$ 0.76	$ 0.71	$ 0.76	$ 0.58	$ 0.41	$ 0.53	$ 0.56	$ 0.51	$ 2.80	$ 2.01	$ 1.52
Diluted earnings attributable to CDK per share (in usd per share)	$ 0.75	$ 0.71	$ 0.75	$ 0.57	$ 0.41	$ 0.53	$ 0.55	$ 0.51	$ 2.78	$ 1.99	$ 1.51

Schedule II - Valuation and Q83

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Adjustment in valuation allowance	$ (13.5)	$ (1.1)
Accounts receivable allowances
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	6.3	7.1	$ 6.8
Charged (credited) to costs and expenses	3.7	1.7	2.3
Charged (credited) to other accounts	0	0	(0.1)
Deductions	(2.6)	(2.5)	(1.9)
Balance at end of period	7.4	6.3	7.1
Deferred tax valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	35.1	34.3	33.4
Charged (credited) to costs and expenses	0	1.9	1.1
Charged (credited) to other accounts	0	0	(0.2)
Deductions	(13.5)	(1.1)	0
Balance at end of period	$ 21.6	$ 35.1	$ 34.3