Zayo 10-Q 6 Nov 19 2020 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Sep. 30, 2019shares
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2019
Entity File Number	333-169979
Entity Registrant Name	ZAYO GROUP LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-2012549
Entity Address, Address Line One	1821 30th Street, Unit A,
Entity Address, City or Town	Boulder
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80301
City Area Code	303
Local Phone Number	381-4683
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Central Index Key	0001502756
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Current assets
Cash and cash equivalents	$ 253.9	$ 185.4
Trade receivables, net of allowance of $16.9 and $17.6 as of September 30, 2019 and June 30, 2019, respectively	151.9	177
Prepaid expenses	68.1	65.3
Other current assets	57	56.8
Total current assets	530.9	484.5
Property and equipment, net	5,851.8	5,808.9
Intangible assets, net	1,092.8	1,118.8
Goodwill	1,701.1	1,706.6
Right-of-use operating lease assets	499.2
Deferred income taxes, net	21.3	24.8
Other assets	184	190.2
Total assets	9,881.1	9,333.8
Current liabilities
Accounts payable	31.9	73.7
Accrued liabilities	323.6	314.8
Accrued interest	84.9	73.1
Current portion of long-term debt	130	5
Operating lease obligations, current	127.2
Finance lease obligations, current	9.5	10
Deferred revenue, current	172.9	174.9
Total current liabilities	880	651.5
Long-term debt, non-current	5,696.1	5,839.7
Operating lease liabilities, non-current	387.4
Finance lease obligation, non-current	176	172.2
Deferred revenue, non-current	1,205.4	1,148.1
Deferred income taxes, net	147.5	138.8
Other long-term liabilities	30.1	54.7
Total liabilities	8,522.5	8,005
Commitments and contingencies (Note 11)
Member's equity
Member's interest	1,602.5	1,576.2
Accumulated other comprehensive loss	(38.3)	(23.9)
Accumulated deficit	(205.6)	(223.5)
Total member's equity	1,358.6	1,328.8
Total liabilities and member's equity	$ 9,881.1	$ 9,333.8

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
CONDENSED CONSOLIDATED BALANCE SHEETS
Trade receivables allowance	$ 16.9	$ 17.6

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 638.6	$ 641.1
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation-Note 8)	231	228.4
Selling, general and administrative expenses (including stock-based compensation-Note 8)	122.6	122.1
Depreciation and amortization	156.1	167.8
Total operating costs and expenses	509.7	518.3
Operating income	128.9	122.8
Other expenses
Interest expense	(84.7)	(82.2)
Foreign currency loss on intercompany loans	(12.9)	(4.6)
Other income, net	0.6	6.6
Total other expenses, net	(97)	(80.2)
Income from operations before income taxes	31.9	42.6
Provision for income taxes	14	20.5
Net income	$ 17.9	$ 22.1

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 17.9	$ 22.1
Foreign currency translation adjustments, net of tax	(14.8)	8.2
Defined benefit pension plan adjustment, net of tax	0.4	(1.9)
Comprehensive income	$ 3.5	$ 28.4

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF MEMBER'S EQUITY - USD ($) $ in Millions	Member's Interest [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]	Accumulated Deficit [Member]	Total
Balance at Jun. 30, 2018	$ 1,876.6	$ (15.5)	$ (373.5)	$ 1,487.6
Stock-based compensation	26.3			26.3
Foreign currency translation adjustment		8.2		8.2
Capital distribution to parent	(0.2)			(0.2)
Defined benefit pension plan adjustment		(1.9)		(1.9)
Net income			22.1	22.1
Balance at Sep. 30, 2018	1,902.7	(9.2)	(351.4)	1,542.1
Balance at Jun. 30, 2019	1,576.2	(23.9)	(223.5)	1,328.8
Stock-based compensation	26.3			26.3
Foreign currency translation adjustment		(14.8)		(14.8)
Defined benefit pension plan adjustment		0.4		0.4
Net income			17.9	17.9
Balance at Sep. 30, 2019	$ 1,602.5	$ (38.3)	$ (205.6)	$ 1,358.6

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income	$ 17.9	$ 22.1
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	156.1	167.8
Gain on sale of SRT		(5.5)
Non-cash interest expense	2.7	2.5
Stock-based compensation	27.2	26.7
Amortization of deferred revenue	(40.3)	(37)
Foreign currency loss on intercompany loans	12.9	4.6
Deferred income taxes	11.8	15.9
Provision for bad debts	2.6	1.5
Non-cash loss on investments		0.3
Changes in operating assets and liabilities, net of acquisitions
Trade receivables	20.9	4.5
Accounts payable and accrued liabilities	27.3	9
Additions to deferred revenue	81.4	30.5
Other assets and liabilities	(8.7)	(1.1)
Net cash provided by operating activities	311.8	241.8
Cash flows from investing activities
Purchases of property and equipment	(217.1)	(182.5)
Proceeds from sale of SRT, net of cash held in escrow		39
Net cash used in investing activities	(217.1)	(143.5)
Cash flows from financing activities
Principal payments on long-term debt	(21.3)	(1.3)
Principal payments on finance lease obligations	(2.1)	(1.9)
Payments to repurchase ZGH common stock		(0.2)
Cash paid for Santa Clara acquisition financing arrangement and other		(3.3)
Net cash used in financing activities	(23.4)	(6.7)
Net cash flows	71.3	91.6
Effect of changes in foreign exchange rates on cash	(2.7)	2.2
Net increase in cash, cash equivalents and restricted cash	68.6	93.8
Cash, cash equivalents and restricted cash, beginning of period	186.6	260.6
Cash, cash equivalents and restricted cash, end of period	255.2	354.4
Supplemental information:
Cash paid for interest, net of capitalized interest	67.2	63.4
Cash paid for income taxes	3	2
Non-cash purchases of equipment through finance leasing	5.7	21.9
Non-cash purchases of equipment through nonmonetary exchange	19.5	31.1
Decrease in accounts payable and accrued expenses for purchases of property and equipment	$ (39.9)	$ (2.4)

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	$ 253.9	$ 185.4	$ 353.2	$ 256
Restricted cash included in other assets	1.3	1.2	1.2	4.6
Total cash, cash equivalents and restricted cash	$ 255.2	$ 186.6	$ 354.4	$ 260.6

BUSINESS AND BASIS OF PRESENTAT

BUSINESS AND BASIS OF PRESENTATION	3 Months Ended
	Sep. 30, 2019
BUSINESS AND BASIS OF PRESENTATION
BUSINESS AND BASIS OF PRESENTATION	ZAYO GROUP, LLC AND SUBSIDIARIES NOTES TO THE CONDENSED CONSOLIDATED STATEMENTS (UNAUDITED) ​ (1) BUSINESS AND BASIS OF PRESENTATION Business Zayo Group, LLC, a Delaware limited liability company, was formed on May 4, 2007, and is the operating parent company of a number of subsidiaries engaged in providing access to bandwidth infrastructure. Zayo Group LLC and its subsidiaries are collectively referred to as “Zayo Group” or the “Company.” The Company is a wholly-owned subsidiary of Zayo Group Holdings, Inc. (“ZGH”). ● ● Zayo Colocation (“zColo”), including provision of colocation space and power and interconnection offerings, and cloud-based computing offerings. ● Allstream, including Cloud VoIP and Data Solutions. ● Other offerings, including Zayo Professional Services (“ZPS”). Significant Merger Development On May 8, 2019, ZGH, Front Range TopCo, Inc. (“Parent”), a Delaware corporation and Front Range BidCo, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Merger Sub”) entered into an Agreement and Plan of Merger (the “Merger Agreement”) to be acquired by a consortium of private equity funds including affiliates of EQT Infrastructure IV, Digital Colony Partners, LP, DC Front Range Holdings I, LP and FMR LLC (the “Consortium”). Upon the close of the Merger (defined below), ZGH will operate as a privately-held company. Parent and Merger Sub were formed by the Consortium. The Merger Agreement provides, among other things and upon the terms and subject to the conditions of the Merger Agreement, (i) Merger Sub will be merged with and into ZGH (the “Merger”), with ZGH surviving and continuing as the surviving corporation in the Merger and a wholly owned subsidiary of Parent, and (ii) at the effective time of the Merger, each outstanding share of common stock of ZGH, par value $0.001 per share (“Common Stock”) (other than Common Stock owned by Parent, Merger Sub or any wholly owned subsidiary of Parent or Merger Sub or held in the treasury of ZGH, all of which shall be cancelled without any consideration being exchanged therefore, shares of ZGH Common Stock held by holders who have made a valid demand for appraisal in accordance with Section 262 of the Delaware General Corporation Law) will be converted into the right to receive an amount equal to $35.00 per share in cash (the “Merger Consideration”). The closing of the Merger is subject to customary closing conditions, including (i) the adoption of the Merger Agreement by the holders of not less than a majority of the outstanding shares of ZGH Common Stock, (ii) the receipt of specified required regulatory approvals, (iii) the absence of any law or order enjoining or prohibiting the Merger or making it illegal, (iv) the accuracy of the representations and warranties contained in the Merger Agreement (subject to “material adverse effect” and materiality qualifications) and (v) compliance with covenants in the Merger Agreement in all material respects. ZGH’s board of directors and the board of directors of Parent have each unanimously approved the Merger and the Merger Agreement. On July 26, 2019, ZGH held a special meeting of stockholders where our stockholders approved the adoption of the Merger Agreement. On July 31, 2019, ZGH announced the early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, satisfying one of the conditions to the closing of the pending transaction. The closing of the deal continues to be subject to customary conditions, including regulatory clearances relating to review and clearance by the Committee on Foreign Investment in the United States and the receipt of certain foreign antitrust approvals, certain other foreign direct investment review approvals, and specified FCC and state public utility commission approvals. Basis of Presentation The accompanying condensed consolidated financial statements include all the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated in consolidation. The accompanying condensed consolidated financial statements and related notes are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q, and do not include all of the note disclosures required by GAAP for complete financial statements. These condensed consolidated financial statements should, therefore, be read in conjunction with the consolidated financial statements and notes thereto for the year ended June 30, 2019 included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2019. In the opinion of management, all adjustments considered necessary for a fair presentation of financial position, results of operations and cash flows of the Company have been included herein. The results of operations for the three months ended September 30, 2019 are not necessarily indicative of the operating results for any future interim period or the full year. Unless otherwise noted, dollar amounts and disclosures throughout the notes to the condensed consolidated financial statements are presented in millions of dollars. The Company’s fiscal year ends June 30 each year, and we refer to the fiscal year ending June 30, 2020 as “Fiscal 2020” and the fiscal year ended June 30, 2019 as “Fiscal 2019.” Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Estimates are used when establishing allowances for doubtful accounts and accruals for billing disputes, determining useful lives for depreciation and amortization and accruals for exit activities associated with real estate leases, assessing the need for impairment charges (including those related to intangible assets and goodwill), determining the fair values of assets acquired and liabilities assumed in business combinations, accounting for income taxes and related valuation allowances against deferred tax assets, determining the defined benefit costs and defined benefit obligations related to post-employment benefits, selection of the discount rate used to value lease liabilities, determining the fair value of nonmonetary exchanges, determining the fair value of plan assets related to post-employment benefits and estimating certain restricted stock unit grant fair values used to compute the stock-based compensation liability and expense. Management evaluates these estimates and judgments on an ongoing basis and makes estimates based on historical experience, current conditions, and various other assumptions that are believed to be reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from these estimates under different assumptions or conditions. Significant Accounting Policies On July 1, 2019, the Company adopted the requirements of Accounting Standards Update (“ASU”) 2016-02, Leases (ASC 842). See Recently Adopted Accounting Pronouncements below and Note 13 – Leases There have been no other changes to the Company’s significant accounting policies described in its Annual Report on Form 10-K for the year ended June 30, 2019. Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, " Measurement of Credit Losses on Financial Instruments ." The primary impact of ASU 2016-13 for us is a change in the model for the recognition of credit losses related to our financial instruments from an incurred loss model, which recognized credit losses only if it was probable a loss had been incurred, to an expected loss model, which requires our management team to estimate the total credit losses expected on the portfolio of financial instruments. We are currently reviewing the requirements of the standard and evaluating the impact on our consolidated financial statements. We are required to adopt the provisions of ASU 2016-13 no later than July 1, 2020. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases The Company adopted ASC 842 effective July 1, 2019 using the modified retrospective transition method. Under this method, the Company recognized a cumulative effect adjustment in the first quarter of Fiscal 2020, rather than restating any prior periods. Comparative information for prior periods has not been restated and continues to be reported in accordance with Topic 840. The Company elected the package of practical expedients permitted under the transition guidance, which does not require reassessment of prior conclusions related to contracts containing a lease, lease classification and initial direct lease costs. As an accounting policy election, the Company will exclude short-term leases (term of 12 months or less) from the balance sheet presentation and will account for non-lease and lease components in a contract as a single lease component for certain asset classes. The Company also elected the land easements practical expedient which permits the Company to carry forward the historical accounting treatment for agreements entered into prior to the adoption date. The adoption of ASC 842 impacted the Company’s condensed consolidated balance sheet with the recognition of existing operating leases as lessee resulting in $527.6 million of right-of-use (“ROU”) assets and $545.1 million of lease liabilities recorded as of July 1, 2019. The standard did not materially impact the Company’s consolidated net earnings or cash flows for the three months ended September 30, 2019. As lessor, accounting for the Company’s leases remains largely unchanged from ASC 840. The Company leases dark fiber and circuits (within the Zayo Networks segment) and provides leases of colocation space (within the zColo segment) which have contract terms that are accounted for as operating leases and are further described in Note 15 – Segment Reporting ​

ACQUISITIONS AND DISPOSITIONS

ACQUISITIONS AND DISPOSITIONS	3 Months Ended
	Sep. 30, 2019
ACQUISITIONS AND DISPOSITIONS
ACQUISITIONS AND DISPOSITIONS	(2) ACQUISITIONS AND DISPOSITIONS ​ Since inception through September 30, 2019, the Company has consummated 45 transactions accounted for as business combinations. The acquisitions were executed as part of the Company’s business strategy of expanding through acquisitions. The acquisitions of these businesses have allowed the Company to increase the scale at which it operates, which in turn affords the Company the ability to increase its operating leverage, extend its network reach, and broaden its customer base. The accompanying condensed consolidated financial statements include the operations of the acquired entities from their respective acquisition dates. In the Company’s acquisitions, the Company acquired certain customer relationships. These relationships represent a valuable intangible asset, as the Company anticipates continued business from the acquired customer bases. The Company’s estimate of the fair value of the acquired customer relationships is generally based on a multi-period excess earnings valuation technique utilizing Level 3 inputs. Transaction Costs Transaction costs include expenses associated with professional services (i.e., legal, accounting, regulatory, etc.) rendered in connection with signed and/or closed acquisitions or disposals, travel expense, severance expense incurred associated with acquisitions or disposals, and other direct expenses incurred associated with signed and/or closed acquisitions or disposals and unsuccessful acquisitions. The Company incurred transaction costs of $2.0 million and $0.7 million for the three months ended September 30, 2019 and 2018, respectively. Transaction costs of $2.0 million in the three months ended September 30, 2019 are related to the Merger Agreement between the Company, Parent and Merger Sub (see Note 1 – Organization and Description of Business ). Transaction costs have been included in selling, general and administrative expenses in the condensed consolidated statements of operations and in cash flows from operating activities in the condensed consolidated statements of cash flows during these periods. Scott-Rice Telephone Co. On July 31, 2018, the Company completed the sale of Scott-Rice Telephone Co. (“SRT”), a Minnesota incumbent local exchange carrier, for $42.2 million to Nuvera Communications, Inc. (formerly New Ulm Telecom, Inc.). As of September 30, 2019, $3.2 million of purchase consideration was held in escrow. The Company recognized a pre-tax gain of $5.5 million on the sale, which is included in other income, net in the condensed consolidated statements of operations. The Company acquired SRT as part of its March 1, 2017 purchase of Electric Lightwave Parent, Inc. and it was included as part of the Allstream segment. SRT had a pre-tax net loss of $1.6 million for the year ended June 30, 2018 and pre-tax net income of $2.9 million from when it was acquired in March 1, 2017 through June 30, 2017. The Company concluded SRT was not a significant disposal group and did not represent a strategic shift, and therefore was not classified as discontinued operations. ​

GOODWILL

GOODWILL	3 Months Ended
	Sep. 30, 2019
GOODWILL
GOODWILL	(3) GOODWILL During the fourth quarter of Fiscal 2019, the Company implemented organizational changes resulting in changes to its reportable segments. In connection with the organizational change, the Company’s reporting units changed and goodwill was re-allocated to the new reporting units on a relative fair value basis. The Company completed an assessment immediately prior to and after the organizational change and determined it is more likely than not the fair value of the Company’s reporting units is greater than their carrying amounts. The following reflects the changes in the carrying amount of goodwill during the three months ended September 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Product Group As of June 30, 2019 Foreign Currency As of September 30, 2019 ​ ​ (in millions) Fiber Solutions ​ $ 1,000.9 ​ $ (3.2) ​ $ 997.7 Layer 2/3 ​ ​ 200.8 ​ ​ (0.7) ​ ​ 200.1 Transport ​ ​ 176.2 ​ ​ (0.6) ​ ​ 175.6 zColo ​ ​ 259.6 ​ ​ (1.0) ​ ​ 258.6 Cloud ​ ​ 14.7 ​ ​ — ​ ​ 14.7 Allstream ​ ​ 39.0 ​ ​ — ​ ​ 39.0 Other ​ ​ 15.4 ​ ​ — ​ ​ 15.4 Total ​ $ 1,706.6 ​ $ (5.5) ​ $ 1,701.1 ​

INTANGIBLE ASSETS

INTANGIBLE ASSETS	3 Months Ended
	Sep. 30, 2019
INTANGIBLE ASSETS
INTANGIBLE ASSETS	(4) INTANGIBLE ASSETS Identifiable intangible assets as of September 30, 2019 and June 30, 2019 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Carrying Amount Accumulated Net ​ ​ (in millions) September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ Finite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 1,550.6 ​ $ (477.0) ​ $ 1,073.6 Underlying rights and other ​ ​ 3.4 ​ ​ (1.7) ​ ​ 1.7 Total ​ ​ 1,554.0 ​ ​ (478.7) ​ ​ 1,075.3 Indefinite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Certifications ​ ​ 3.5 ​ ​ — ​ ​ 3.5 Underlying rights and other ​ ​ 14.0 ​ ​ — ​ ​ 14.0 Total ​ $ 1,571.5 ​ $ (478.7) ​ $ 1,092.8 June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ Finite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 1,597.6 ​ $ (498.7) ​ $ 1,098.9 Underlying rights and other ​ ​ 3.4 ​ ​ (1.5) ​ ​ 1.9 Total ​ ​ 1,601.0 ​ ​ (500.2) ​ ​ 1,100.8 Indefinite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Certifications ​ ​ 3.5 ​ ​ — ​ ​ 3.5 Underlying rights and other ​ ​ 14.5 ​ ​ — ​ ​ 14.5 Total ​ $ 1,619.0 ​ $ (500.2) ​ $ 1,118.8 ​

LONG-TERM DEBT

LONG-TERM DEBT	3 Months Ended
	Sep. 30, 2019
LONG-TERM DEBT
LONG-TERM DEBT	(5) LONG-TERM DEBT As of September 30, 2019 and June 30, 2019, long-term debt was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Date of ​ ​ ​ Outstanding as of ​ ​ ​ Issuance or most Maturity Interest Interest Rate September 30, 2019 June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in millions) Term Loan Facility due 2021 ​ Jan 2017 ​ Jan 2021 ​ Monthly ​ LIBOR +2.00% ​ $ 487.5 ​ $ 488.7 ​ B-2 Term Loan Facility ​ Feb 2018 ​ Jan 2024 ​ Monthly ​ LIBOR +2.25% ​ ​ 1,269.3 ​ ​ 1,269.3 ​ 6.00% Senior Unsecured Notes ​ Jan & Mar 2015 ​ Apr 2023 ​ Apr/Oct ​ 6.00% ​ ​ 1,430.0 ​ ​ 1,430.0 ​ 6.375% Senior Unsecured Notes ​ May 2015 & Apr 2016 ​ May 2025 ​ May/Nov ​ 6.375% ​ ​ 900.0 ​ ​ 900.0 ​ 5.75% Senior Unsecured Notes ​ Jan, Apr & Jul 2017 ​ Jan 2027 ​ Jan/Jul ​ 5.75% ​ ​ 1,650.0 ​ ​ 1,650.0 ​ Revolving Loan Facility ​ Jan/Apr 2019 (1) ​ Jul 2020 (2) ​ Monthly ​ LIBOR +1.75% ​ ​ 125.0 ​ ​ 145.0 ​ Total obligations ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5,861.8 ​ ​ 5,883.0 ​ Unamortized premium, net ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 11.9 ​ ​ 11.9 ​ Unamortized debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (47.6) ​ ​ (50.2) ​ Carrying value of debt ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5,826.1 ​ ​ 5,844.7 ​ Less current portion (2) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (130.0) ​ ​ (5.0) ​ Total long-term debt, less current portion ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 5,696.1 ​ $ 5,839.7 ​ (1) The most recent borrowings under the Revolving Loan Facility occurred in January 2019 and the most recent amendment on the Revolving Loan Facility was April 2019. (2) The earliest possible maturity under the Extension Amendment No. 1 entered into on April 3, 2019 is July 2020 and as a result, the Revolving Loan Facility is classified as current. See below for further details. Term Loan Facility and Revolving Credit Facility On May 6, 2015, the Company and Zayo Capital, Inc. (“Zayo Capital”) entered into an Amendment and Restatement Agreement whereby the Credit Agreement (the “Credit Agreement”) governing the senior secured term loan facility (the “Term Loan Facility”) and $450.0 million senior secured revolving credit facility (the “Revolver”) was amended and restated in its entirety. The amended and restated Credit Agreement extended the maturity date of a portion of the outstanding term loans under the Term Loan Facility from July 2, 2019 to May 6, 2021, which was subsequently revised to January 19, 2021 in Incremental Amendment No. 2 (as defined and discussed below). The terms of the Term Loan Facility require the Company to make quarterly principal payments of 25 basis points per quarter of the original loan amount (unless reduced by any prepayments), plus an annual payment of up to 50% of excess cash flow, as determined in accordance with the Credit Agreement (no such annual payment was required during Fiscal 2020 or Fiscal 2019). On January 19, 2017, the Company and Zayo Capital entered into an Incremental Amendment No. 2 (the “Incremental Amendment”) to the Company’s Credit Agreement. Per the terms of the Incremental Amendment, the existing $1.85 billion of term loans under the Credit Agreement were repriced at 99.75% with one $500.0 million tranche that bears interest at a rate of LIBOR plus 2.0%, with a minimum LIBOR rate of 0.0% and a maturity date of four years from incurrence (January 19, 2021), which represents a downward adjustment of 75 basis points along with the lowering of the previous LIBOR floor, and a second $1.35 billion tranche (the “B-2 Term Loan” and along with the $500.0 million tranche, the “Refinancing Term Loans”) that bears interest at a rate of LIBOR plus 2.5%, with a minimum LIBOR rate of 1.0% and a maturity of seven years from incurrence, which represents a downward adjustment of 25 basis points. In addition, per the terms of the Incremental Amendment, the Company and Zayo Capital added a new $650.0 million term loan tranche under the Credit Agreement (the “Electric Lightwave Incremental Term Loan”) that bears interest at LIBOR plus 2.5%, with a minimum LIBOR rate of 1.0%, with a maturity of seven years from the closing date of the Incremental Amendment. In connection with the Incremental Amendment, the full $2,500.0 million Term Loan Facility, including the Refinancing Term Loans and the Electric Lightwave Incremental Term Loan, was re-issued at a price of 99.75 %. No other material terms of the Credit Agreement with respect to the Refinancing Term Loans and the Electric Lightwave Incremental Term Loan were amended. On April 10, 2017, $570.1 million of the B-2 Term Loan and the Electric Lightwave Incremental Term Loan was repaid from proceeds of issuance of senior unsecured notes as further discussed below. Additionally, in July 2017, $310.7 million of the B-2 Term Loan was repaid from the proceeds of issuance of senior unsecured notes as further discussed below. On July 20, 2017, the Company and Zayo Capital entered into a second repricing (the “Repricing Amendment No. 2”) to the Credit Agreement. Per the terms of the Repricing Amendment No. 2, the outstanding balances of the B-2 Term Loan and Electric Lightwave Incremental Term Loan were repriced at par to bear interest at a rate of LIBOR plus 2.25%, with a minimum LIBOR rate of 1.0%, which represented a downward adjustment of 25 basis points. No other terms of the Credit Agreement were amended. On December 22, 2017, the Company and Zayo Capital entered into a third repricing amendment (the “Repricing Amendment No. 3”) to the Credit Agreement. Per the terms of the Repricing Amendment No. 3, the Revolver under the Credit Agreement was repriced to bear interest at a rate of LIBOR plus 1.00% to LIBOR plus 1.75% per annum based on the Company’s leverage ratio, which represented a downward adjustment of 100 basis points. No other terms of the Credit Agreement were amended. T he Revolver matures on April 17, 2020, which was subsequently extended on April 3, 2019. Refer below for more information on the extension. The Credit Agreement also allows for letter of credit commitments of up to $50.0 million. The Revolver is subject to a fee per annum of 0.25% to 0.375% (based on the Company’s current leverage ratio) of the weighted-average unused capacity, and the undrawn amount of outstanding letters of credit backed by the Revolver are subject to a 0.25% fee per annum. Outstanding letters of credit backed by the Revolver are subject to a fee of 1.00% to 1.75% per annum based upon the Company’s leverage ratio. On February 26, 2018, the Company and Zayo Capital entered into an amendment to the Credit Agreement and the Company added a new $150 million term loan tranche under the Credit Agreement (the “Incremental $150 Million Term Loan”). The Incremental $150 Million Term Loan bears interest at LIBOR plus 2.25%, with a minimum LIBOR rate of 1.0%, with a maturity date of January 19, 2024, which is coterminous with the B-2 Term Loan. The Company used the proceeds of the Incremental $150 Million Term Loan for general corporate purposes, including the funding of acquisitions permitted under the Credit Agreement. No other terms of the Credit Agreement were amended. On April 3, 2019, the Company and Zayo Capital entered into Extension Amendment No. 1 to the Credit Agreement (the “Extension Amendment”) with respect to the Revolver. Under the terms of the Extension Amendment, the maturity date of the revolving credit facility was extended from April 17, 2020 to the earliest of (i) April 17, 2023, (ii) six months prior to the maturity date of the $500.0 million term loan tranche, which matures on January 19, 2021, subject to the refinancing thereof with debt having a maturity date no earlier than April 17, 2023 or repayment in full, and (iii) six months prior to the maturity date of the 2023 Unsecured Notes, which mature on April 1, 2023, subject to the refinancing thereof with debt having a maturity date no earlier than April 17, 2023 or repayment in full. As of September 30, 2019, the Company has reclassified the Revolver to current portion of long-term debt because July 2020 is the earliest possible maturity date under the Extension Amendment. The weighted average interest rates (including margin) on the Term Loan Facility were approximately 4.2% and 4.6% at September 30, 2019 and June 30, 2019, respectively. The weighted average interest rates on the Revolver were approximately 3.8% and 4.2% at September 30, 2019 and June 30, 2019, respectively. The Company had no borrowings under the Revolver during the three months ended September 30, 2019 and 2018. As of September 30, 2019, $125.0 million was outstanding under the Revolver and $1,756.8 million in aggregate principal amount was outstanding under the Term Loan Facility. Standby letters of credit were outstanding in the amount of $8.6 million as of September 30, 2019, leaving $316.4 million available under the Revolver, subject to certain conditions. Senior Unsecured Notes 6.00% Senior Unsecured Notes due 2023 On January 23, 2015 and March 9, 2015, the Company and Zayo Capital completed private offerings of aggregate principal amounts of $700.0 million and $730.0 million, respectively, of 6.00% senior unsecured notes due in 2023 (the “2023 Unsecured Notes”). 6.375% Senior Unsecured Notes due 2025 On April 14, 2016, the Company and Zayo Capital completed a private offering of $550.0 million aggregate principal amount of 2025 Unsecured Notes (the “Incremental 2025 Notes”). The Incremental 2025 Notes were priced at 97.76% and were an additional issuance of the $350.0 million 6.375% senior unsecured notes due in 2025 that were originally issued on May 6, 2015 (the “2025 Notes” and together with the Incremental 2025 Notes, the “2025 Unsecured Notes”). The net proceeds from the Incremental 2025 Notes, plus cash on hand, were used to (i) redeem the then outstanding $325.6 million 10.125% senior unsecured notes due 2020, including the required $20.3 million make-whole premium and accrued interest, and (ii) repay $196.0 million of borrowings under the then outstanding secured Term Loan Facility. 5.75% Senior Unsecured Notes due 2027 On January 27, 2017, the Company and Zayo Capital completed a private offering of $800.0 million aggregate principal amount of 5.75% senior unsecured notes due 2027 (the “January 2027 Notes”), which were issued at par. T he net proceeds from the offering, along with the Electric Lightwave Incremental Term Loan discussed above, were used to fund the Electric Lightwave acquisition On April 10, 2017, the Company completed a private offering of $550.0 million aggregate principal amount of 5.75% senior unsecured notes due 2027 (the “Incremental 2027 Notes”). The Incremental 2027 Notes were an additional issuance of the January 2027 Notes and were priced at 104.0% . The net proceeds from the Incremental 2027 Notes were used to repay certain outstanding balances on the Company’s B-2 Term Loan. On July 5, 2017, the Company completed a private offering of $300.0 million aggregate principal amount of 5.75% senior notes due 2027 (the “July Incremental 2027 Notes” and together with the Incremental 2027 Notes and the January 2027 Notes, the “2027 Unsecured Notes”). The July Incremental 2027 Notes were an additional issuance of the January 2027 Notes and Incremental 2027 Notes and were priced at 104.25% . The net proceeds of $310.7 million from the offering were used to further repay certain outstanding balances on the Company’s B-2 Term Loan. Debt covenants The indentures (the “Indentures”) governing the 2023 Unsecured Notes, the 2025 Unsecured Notes and the 2027 Unsecured Notes (collectively the “Notes”) contain covenants that, among other things, restrict the ability of the Company and its subsidiaries to incur additional indebtedness and issue preferred stock, pay dividends or make other distributions with respect to any equity interests, make certain investments or other restricted payments, create liens, sell assets, incur restrictions on the ability of the Company’s restricted subsidiaries to pay dividends or make other payments to the Company, consolidate or merge with or into other companies or transfer all or substantially all of their assets, engage in transactions with affiliates, and enter into sale and leaseback transactions. The terms of the Indentures include customary events of default. The Credit Agreement contains customary events of default, including among others, non-payment of principal, interest, or other amounts when due, inaccuracy of representations and warranties, breach of covenants, cross default to certain other indebtedness, insolvency or inability to pay debts, bankruptcy, or a change of control. The Credit Agreement also contains a covenant, applicable only to the Revolver, that the Company maintain a senior secured leverage ratio below or equal to 5.25:1.00 at any time when the aggregate principal amount of loans outstanding under the Revolver is greater than 35% of the commitments under the Revolver. The Credit Agreement also requires the Company and its subsidiaries to comply with customary affirmative and negative covenants, including covenants restricting the ability of the Company and its subsidiaries, subject to specified exceptions, to incur additional indebtedness, make additional guaranties, incur additional liens on assets, or dispose of assets, pay dividends, or make other distributions, voluntarily prepay certain other indebtedness, enter into transactions with affiliated persons, make investments and amend the terms of certain other indebtedness. The Indentures limit any increase in the Company’s secured indebtedness (other than certain forms of secured indebtedness expressly permitted under the Indentures) to a pro forma secured debt ratio of 4.50 times the Company’s previous quarter’s annualized modified EBITDA (as defined in the Indentures), and limit the Company’s incurrence of additional indebtedness to a total indebtedness ratio of 6.00 times the previous quarter’s annualized modified EBITDA. The Company was in compliance with all covenants associated with its debt agreements as of September 30, 2019. Guarantees The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by all of the Company’s current and future domestic restricted subsidiaries. The Notes were co-issued with Zayo Capital, which does not have independent assets or operations. The Term Loan Facility and Revolver are fully and unconditionally guaranteed, jointly and severally, on a senior secured basis by all of the Company’s current and future domestic restricted subsidiaries. Debt issuance costs In connection with the Credit Agreement (and subsequent amendments thereto), and the various Notes offerings, the Company incurred debt issuance costs of $114.8 million (net of extinguishments). These costs are being amortized to interest expense over the respective terms of the underlying debt instruments using the effective interest method, unless extinguished earlier, at which time the related unamortized costs are to be immediately expensed. The balance of debt issuance costs as of September 30, 2019 and June 30, 2019 was $47.6 million and $50.2 million, net of accumulated amortization of $67.3 million and $64.6 million, respectively. The amortization of debt issuance costs is included on the condensed consolidated statements of cash flows within non-cash interest expense along with the amortization or accretion of the premium and discount on the Company’s indebtedness. Interest expense associated with the amortization of debt issuance costs of $2.7 million and $2.5 million for the three months ended September 30, 2019 and 2018, respectively. Debt issuance costs are presented in the condensed consolidated balance sheets as a reduction to long-term debt, non-current.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Sep. 30, 2019
INCOME TAXES
INCOME TAXES	(6) INCOME TAXES A reconciliation of the actual income tax provision and the tax computed by applying the U.S. federal rate to the earnings before income taxes during the three month periods ended September 30, 2019 and 2018 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ 2019 2018 ​ ​ (in millions) Expected provision at the statutory rate ​ $ 6.7 ​ $ 8.9 Increase/(decrease) due to: ​ ​ ​ ​ ​ ​ Stock-based compensation ​ ​ 0.7 ​ ​ 1.1 State income taxes expense, net of federal benefit ​ ​ 1.9 ​ ​ 1.5 Change in statutory tax rate, outside U.S. ​ ​ — ​ ​ (0.1) Change in uncertain tax benefits ​ ​ 1.0 ​ ​ — Foreign tax rate differential ​ ​ 1.2 ​ ​ 0.2 State NOL expirations ​ ​ 1.6 ​ ​ — U.S. Tax Reform ​ ​ — ​ ​ 7.6 Change in valuation allowance ​ ​ — ​ ​ (0.3) Other, net ​ ​ 0.9 ​ ​ 1.6 Provision for income taxes ​ $ 14.0 ​ $ 20.5 ​ The Company’s interim income tax provision reflects an estimate of the effective tax rate for the full fiscal year, applied to the year-to-date book income, adjusted for any discrete events, which are recorded in the period in which they occur. The estimates are re-evaluated each quarter based on estimated tax expense for the full fiscal year. On December 22, 2017, the U.S. federal government enacted a tax bill, H.R.1, An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018, previously known as the Tax Cuts and Jobs Act of 2017 (“U.S. Tax Reform”). U.S. Tax Reform reduced the U.S. corporate tax rate from 35% to 21 %, created a territorial tax system with a one-time mandatory repatriation tax on previously deferred foreign earnings, and changed business-related deductions and credits. Provisional impacts of U.S. Tax Reform were recorded in the six months ended June 30, 2018 and further adjusted during the three months ended September 30, 2018. In accordance with SAB 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, The Company files income tax returns in various federal, state, and local jurisdictions including the United States, Canada, United Kingdom and France. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world. With few exceptions, the Company is no longer subject to income tax examinations by tax authorities in major tax jurisdictions for years prior to 2014. The Company had gross unrecognized tax benefits of $16.4 million and $15.7 million, as of September 30, 2019 and June 30, 2019, respectively. These amounts include accrued interest and penalties of $2.5 million and $2.2 million, respectively as of September 30, 2019 and June 30, 2019. The Company recognizes interest and penalties related to uncertain tax positions in the provision for income taxes.

EQUITY

EQUITY	3 Months Ended
	Sep. 30, 2019
EQUITY
EQUITY	(7) EQUITY On May 7, 2018, the Board of Directors of ZGH authorized the repurchase of up to $500 million of shares of ZGH outstanding common stock from time to time using a variety of methods, including open market purchases, privately negotiated transactions and other means in accordance with federal securities laws. During the three months ended September 30, 2018, the Company repurchased 6,229 shares of ZGH outstanding common stock at an average price of $34.00, or $0.2 million. The authorization expired on November 7, 2018 with the Company having repurchased $496.0 million under the authorization. The stock repurchase on behalf of ZGH is included in the condensed consolidated statement of member’s equity as a capital distribution to ZGH. During the three months ended September 30, 2019 and 2018, the Company recorded $26.3 million in each period in member’s interest associated with stock-based compensation expense related to the Company’s equity classified stock-based compensation awards (See Note 8 – Stock-based Compensation

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Sep. 30, 2019
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION	(8) STOCK-BASED COMPENSATION The following tables summarize the Company’s stock-based compensation expense for liability and equity classified awards included in the condensed consolidated statements of operations. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ ​ 2019 2018 ​ ​ (in millions) Included in: ​ ​ ​ ​ ​ ​ Operating costs ​ $ 3.2 ​ $ 2.7 Selling, general and administrative expenses ​ ​ 24.0 ​ ​ 24.0 Total stock-based compensation expense ​ $ 27.2 ​ $ 26.7 ​ ​ ​ ​ ​ ​ ​ Part A restricted stock units ​ $ 22.7 ​ $ 23.3 Part B restricted stock units ​ ​ 3.8 ​ ​ 2.9 Part C restricted stock units ​ ​ 0.7 ​ ​ 0.5 Total stock-based compensation expense ​ $ 27.2 ​ $ 26.7 ​ Performance Compensation Incentive Program During October 2014, the Company adopted the 2014 Performance Compensation Incentive Program (“PCIP”). The PCIP includes incentive cash compensation and equity (in the form of restricted stock units or “RSUs”). Grants under the PCIP RSU plans are made quarterly for all participants. The PCIP was effective on October 16, 2014 and will remain in effect for a period of 10 years (or through October 16, 2024) unless it is earlier terminated by ZGH’s Board of Directors. The PCIP has the following components: Part A Under Part A of the PCIP, certain full-time employees, including the Company’s executives, are eligible to earn quarterly awards of RSUs. Each participant in Part A of the PCIP will have an RSU annual award target value, which will be allocated to each fiscal quarter. The final Part A value awarded to a participant for any fiscal quarter is determined by the Compensation Committee of the Board of Directors subsequent to the end of the respective performance period taking into account the Company’s measured value creation for the quarter, as well as such other subjective factors that it deems relevant (including group and individual level performance factors). The number of Part A RSUs granted will be calculated based on the final award value determined by the Compensation Committee divided by the average closing price of the Company’s common stock over the last ten trading days of the respective performance period. Part A RSUs will vest assuming continuous employment fifteen months subsequent to the end of the performance period (for awards relating to quarterly periods through June 30, 2017) or twelve months subsequent to the end of the performance period (for awards relating to quarterly periods subsequent to June 30, 2017). Upon vesting, the RSUs convert to an equal number of shares of ZGH’s common stock. Additionally, Part A RSU awards may be granted to certain employees upon commencement of their employment with the Company. The September 2019 and June 2019 quarterly awards were recorded as liabilities totaling $6.7 million and $6.2 million, as of September 30, 2019 and June 30, 2019, respectively, as the awards represent an obligation denominated in a fixed dollar amount to be settled in a variable number of shares during the subsequent quarter. The following table summarizes the Company’s Part A RSU activity for the three months ended September 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Number of Part A Weighted average ​ Weighted average Outstanding at July 1, 2019 ​ ​ 2,324,396 ​ $ 28.49 ​ ​ 6.6 Granted ​ ​ 640,191 ​ ​ 33.73 ​ ​ ​ Vested ​ ​ (552,064) ​ ​ 25.93 ​ ​ ​ Forfeited ​ ​ (74,448) ​ ​ n/a ​ ​ ​ Outstanding at September 30, 2019 ​ ​ 2,338,075 ​ $ 30.39 ​ ​ 5.8 ​ Part B Under Part B of the PCIP, participants, including the Company’s executives, are awarded quarterly grants of RSUs. The number of the RSUs earned by the participants is based on ZGH’s stock price performance over a performance period of one year with the starting price being the average closing price over the last ten trading days of the quarter immediately prior to the grant and the ending price being the average closing price over the last ten trading days of the quarter immediately prior to vesting. The RSUs vest on the last day of the twelve month period, after the beginning of the performance period (for awards vesting on or prior to June 30, 2018) or the fifteen month period after the beginning of the performance period (for awards vesting after June 30, 2018), subject to continued employment through such date. The existence of a vesting provision that is associated with the performance of ZGH’s stock price is a market condition, which affects the determination of the grant date fair value. Upon vesting, RSUs earned convert to an equal number of shares of ZGH’s common stock. The Company’s Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”) are also awarded quarterly grants of RSUs under the same provisions as other Part B participants outlined above. However, beginning with the grant during the three months ended December 31, 2018, in the case of the CEO, and beginning with the grant during the three months ended March 31, 2019, in the case of the CFO, awards are subject to additional vesting criteria that are based on ZGH’s stock performance subsequent to the end of the measurement period. In order for the CEO and CFO to receive the maximum award, ZGH’s stock price must remain at or above the ending measurement period price for the six months subsequent to the end of the performance period. ​ The following table summarizes the Company’s Part B RSU activity for the three months ended September 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Number of Part B Weighted average ​ Weighted average Outstanding at July 1, 2019 ​ ​ 289,254 ​ $ 49.73 ​ ​ 8.0 Granted ​ ​ 64,705 ​ ​ 69.86 ​ ​ ​ Vested ​ ​ (57,336) ​ ​ 64.41 ​ ​ ​ Forfeited ​ ​ — ​ ​ n/a ​ ​ ​ Outstanding at September 30, 2019 ​ ​ 296,623 ​ $ 51.28 ​ ​ 7.5 ​ The table below reflects the total Part B RSUs granted during each period presented, the maximum eligible shares of ZGH’s common stock that the respective Part B RSU grant could be converted into shares of ZGH’s common stock, and the grant date fair value per Part B RSU during the period indicated. The table below also reflects the units converted to ZGH’s common stock at a vesting date that is subsequent to the period indicated for those RSUs granted during the period indicated: ​ ​ ​ ​ ​ ​ ​ During the Three Months Ended ​ ​ September 30, 2019 Part B RSUs granted ​ ​ 64,705 Maximum eligible shares of ZGH’s common stock ​ ​ 446,465 Grant date fair value per Part B RSU ​ $ 69.86 Units converted to ZGH’s common stock at vesting date ​ ​ n/a ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ During the Three Months Ended ​ ​ June 30, 2019 March 31, 2019 December 31, 2018 September 30, 2018 Part B RSUs granted ​ 75,370 ​ ​ 98,342 ​ ​ 61,123 ​ ​ 58,418 Maximum eligible shares of ZGH's common stock ​ ​ 520,053 ​ ​ 678,560 ​ ​ 421,749 ​ ​ 403,084 Grant date fair value per Part B RSU ​ $ 63.67 ​ $ 52.81 ​ $ 22.43 ​ $ 64.41 Units converted to ZGH's common stock at vesting date ​ ​ n/a ​ ​ n/a ​ ​ n/a ​ ​ — ​ The grant date fair value of Part B RSU grants is estimated utilizing a Monte Carlo simulation. This simulation estimates the ten-day average closing stock price ending on the vesting date, the stock price performance over the performance period, and the number of common shares to be issued at the vesting date. Various assumptions are utilized in the valuation method, including the target stock price performance ranges and respective share payout percentages, the ZGH historical stock price performance and volatility, peer companies’ historical volatility and an appropriate risk-free rate. The aggregate future value of the grant under each simulation is calculated using the estimated per share value of the common stock at the end of the vesting period multiplied by the number of common shares projected to be granted at the vesting date. The present value of the aggregate grant is then calculated under each of the simulations, resulting in a distribution of potential present values. The fair value of the grant is then calculated based on the average of the potential present values. The remaining unrecognized compensation cost associated with Part B RSU grants is $8.8 million at September 30, 2019. Part C Under Part C of the PCIP, independent directors of the Company are eligible to receive quarterly awards of RSUs. Independent directors electing to receive a portion of their annual director fees in the form of RSUs are granted a set dollar amount of Part C RSUs each quarter. The quantity of Part C RSUs granted is based on the average closing price of ZGH’s common stock over the last ten trading days of the quarter ended immediately prior to the grant date and vest at the end of each quarter for which the grant was made.

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS	3 Months Ended
	Sep. 30, 2019
EMPLOYEE BENEFITS
EMPLOYEE BENEFITS	(9) EMPLOYEE BENEFITS In connection with the Company’s acquisition of Allstream, Inc. in January 2016, the Company assumed sponsorship for a defined pension plan for certain employees of Allstream, Inc. The Company also assumed sponsorship of an OPEB for certain employees of Allstream, Inc., which provides health care and life insurance benefits for certain eligible retirees. These OPEB plans are not funded. Benefits are paid directly to the participants of these plans. The service cost component of the defined benefit pension and post-retirement benefit (OPEB) plans is included within selling, general and administrative expenses and all other components are recognized in other income, net in the accompanying condensed consolidated statements of operations. ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plans ​ ​ Three Months Ended September 30, ​ 2019 ​ 2018 ​ ​ (in millions) Service cost ​ $ 0.6 ​ $ 0.8 Interest cost ​ ​ 0.9 ​ ​ 0.9 Expected return on plan assets ​ ​ (1.3) ​ ​ (1.4) Amortization of service cost from earlier periods ​ ​ 0.2 ​ ​ 0.2 Gain on curtailment (1) ​ ​ — ​ ​ (0.4) Net periodic pension benefit cost ​ $ 0.4 ​ $ 0.1 ​ (1) During the three months ended September 30, 2018, the Company approved an amendment to the defined benefit pension plan freezing benefit accruals for certain members of the pension plan as of September 30, 2018. The plan freeze had an immaterial impact to the financial statements for the period ended September 30, 2018. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPEB Plans ​ ​ Three Months Ended September 30, ​ 2019 ​ 2018 ​ (in millions) Interest cost ​ $ 0.1 ​ ​ 0.1 Net periodic OPEB benefit cost ​ $ 0.1 ​ $ 0.1 ​

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Sep. 30, 2019
FAIR VALUE MEASUREMENTS
FAIR VALUE MEASUREMENTS	(10) FAIR VALUE MEASUREMENTS The Company’s financial instruments consist of cash and cash equivalents, restricted cash, trade receivables, accounts payable, long-term debt, certain post-employment plans and stock-based compensation liability. The carrying values of cash and cash equivalents, restricted cash, trade receivables and accounts payable approximated their fair values at September 30, 2019 and June 30, 2019 due to the short maturity of these instruments. The carrying value of the Company’s Notes, excluding debt issuance costs, reflects the original amounts borrowed, inclusive of net unamortized premium, and was $4,000.4 million and $4,001.1 million as of September 30, 2019 and June 30, 2019, respectively. Based on market interest rates for debt of similar terms and average maturities, the fair value of the Company's Notes as of September 30, 2019 and June 30, 2019 was estimated to be $4,069.1 million and $4,067.7 million, respectively. The Company’s fair value estimates associated with its Note obligations were derived utilizing Level 2 inputs – quoted prices for similar instruments in active markets. The carrying value of the Company’s Term Loan Facility, excluding debt issuance costs, reflects the original amounts borrowed, inclusive of unamortized discounts, and was $1,748.3 million and $1,748.8 million as of September 30, 2019 and June 30, 2019, respectively. The Company’s Term Loan Facility accrues interest at variable rates based upon the one month, three month or nine month LIBOR plus i) a spread of 2.0% on the Company’s $500.0 million tranche (which has a LIBOR floor of 0.0%) and ii) a spread of 2.25% on its B-2 Term Loan tranche (which has a LIBOR floor of 1.00%). Based on market interest rates for debt of similar terms and average maturities, the fair value of the Company’s Term Loan Facility as of September 30, 2019 and June 30, 2019 was estimated to be $1,762.8 million and $1,758.0 million, respectively. The Company’s fair value estimates associated with its Term Loan Facility obligations were derived utilizing Level 2 inputs—quoted prices for similar instruments in active markets. As of September 30, 2019 and June 30, 2019, the outstanding balance under the Company’s Revolver was $125.0 million and $145.0 million, respectively. A hypothetical increase in the applicable interest rate on the Company’s Term Loan Facility of one percentage point above the 1.0% LIBOR floor would increase the Company’s annual interest expense by approximately $18.8 million.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Sep. 30, 2019
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	(11) COMMITMENTS AND CONTINGENCIES Purchase Commitments As of September 30, 2019, the Company was contractually committed for $586.7 million of capital expenditures for construction materials and purchases of property and equipment. A majority of these obligations are expected to be satisfied in the next twelve months. These obligations are primarily success based; that is, the Company has executed customer contracts that support the future capital expenditures. During the year ended June 30, 2019, the Company entered into a CAD $127.0 million (or $95.9 million) commitment for telecommunications services over a two year period. As of September 30, 2019, CAD $83.0 million (or $62.7 million) remained on the commitment. Also, during the year ended June 30, 2019, the Company entered into a CAD $40.0 million (or $30.2 million) commitment for telecommunications services over a three year period. As of September 30, 2019, CAD $22.2 million (or $16.8 million) remained on the commitment. Outstanding Letters of Credit As of September 30, 2019, the Company had $8.6 million in outstanding letters of credit, which were primarily entered into in connection with various lease agreements. Additionally, as of September 30, 2019, Zayo Canada, Inc., a subsidiary of the Company, had CAD $2.8 million (or $2.1 million) in letters of credit under a CAD $5.0 million (or $3.8 million) unsecured credit agreement. Contingencies In the normal course of business, the Company is party to various outstanding legal proceedings, asserted and unasserted claims, and disputes. In the opinion of management, the ultimate disposition of these matters, both asserted and unasserted, will not have a material adverse effect on the Company’s financial condition, results of operations, or cash flows. The Company accrues for losses related to contingencies when a loss from such claims is probable and the amount of loss can be reasonably estimated. In determining whether a loss from a claim is probable and the loss can be reasonably estimated, the Company reviews and evaluates its litigation and regulatory matters in light of potentially relevant factual and legal developments. If the Company determines an unfavorable outcome is not probable or the amount of loss cannot be reasonably estimated, the Company does not accrue for a potential litigation loss. In those situations, the Company discloses an estimate or range of the reasonably possible losses, if such estimates can be made. At this time, the Company does not believe that it is possible to estimate the reasonably possible losses or a range of reasonably possible losses related to the matters described below. Following the filing of the preliminary proxy statement on June 3, 2019, several complaints were filed against ZGH and its Board of Directors challenging the Merger. Four actions were filed in the United States District Court for the District of Delaware captioned Scarantino v. Zayo Group Holdings, Inc., et al., Case No. 1:19-cv-01068-RGA (D. Del.), Klein v. Zayo Group Holdings, Inc., et al., Case No. 1:19-cv-01085-RGA (D. Del.), Duggan v. Zayo Group Holdings, Inc., et al., Case No. 1:19-cv-01112-RGA (D. Del.), and Dixon v. Zayo Group Holdings, Inc., et al., Case No. 1:19-cv-01123-RGA (D. Del.); one action was filed in the United States District Court for the District of Colorado captioned Graves v. Zayo Group Holdings, Inc., et al., Case No. 1:19-cv-01747-LTB (D. Colo.); and one action was filed in the District Court of Boulder County, Colorado captioned Saroop v. Zayo Group Holdings, Inc., et al., Case No. 2019CV30601. The complaints generally alleged, among other things, that ZGH and its directors disseminated an allegedly false and materially misleading proxy statement or that ZGH’s Board of Directors breached their fiduciary duties in connection with the merger. The complaints sought, among other things, to enjoin the merger, a declaration that the proxy statement violated federal securities laws, unspecified damages, and an award of attorneys’ and experts’ fees. ZGH issued supplemental disclosures in the definitive proxy statement dated June 26, 2019. In light of those supplemental disclosures, as of September 30, 2019, each of the above-referenced complaints was voluntarily dismissed as moot. Three ZGH stockholders also filed complaints in the Delaware Court of Chancery pursuant to 8 Del. C. §220 seeking corporate books and records, captioned Teamsters Local 237 Additional Security Benefit Fund, et al. v. Zayo, C.A. No. 2019-0572-TMR (July 25, 2019); Massachusetts Laborers' Annuity Fund v. Zayo Group Holdings, Inc., C.A. No. 2019-0573-TMR; and Waterhouse v. Zayo Group Holdings, Inc., C.A. No. 2019-0589-TMR (July 31, 2019). The Company intends to vigorously defend against these actions.

REVENUE AND CONTRACT COSTS

REVENUE AND CONTRACT COSTS	3 Months Ended
	Sep. 30, 2019
REVENUE AND CONTRACT COSTS
REVENUE AND CONTRACT COSTS	​ (12) REVENUE AND CONTRACT COSTS Nature of the Company’s Products and Offerings Refer to the Revenue Recognition section of Note 2 – Basis of Presentation and Significant Accounting Policies and Note 15 – Revenue and Contract Costs in our annual report on Form 10-K for the year ended June 30, 2019 for further information regarding our application of ASC 606, including practical expedients and judgments applied in determining the amounts and timing of revenue from contracts with customers. Reconciliation of Total Revenue to Revenue from Contracts with Customers The following table provides the amount of revenue that is not subject to ASC 606, but is instead governed by other accounting standards: ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ 2019 2018 ​ ​ (in millions) Revenue from Contracts with Customers - ASC 606 ​ $ 346.9 ​ ​ 380.9 Lease Revenue - ASC 842 (1) ​ ​ 291.7 ​ ​ 260.2 Total revenue ​ $ 638.6 ​ $ 641.1 (1) Includes revenue from use of long-term Fiber Contracts and Colocation solutions, which are not within the scope of ASC 606. See Note 13 – Leases . Remaining Performance Obligation Associated with Non-Lease Arrangements A majority of the Company’s revenue is provided over a contract term. When allocating the total contract transaction price to identified performance obligations, a portion of the total transaction price relates to performance obligations that are yet to be satisfied or are partially satisfied as of the end of the reporting period. Remaining performance obligations associated with the Company’s contracts reflect recurring charges billed, adjusted to reflect estimates for sales incentives and revenue adjustments. At September 30, 2019, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $1.2 billion. For contracts with original durations of more than one year remaining, we expect to recognize approximately 49.3%, 31.2% and 13.2% of our remaining performance obligations as revenue during the remainder of the nine months ended June 30, 2020, year ended June 30, 2021 and year ended June 30, 2022, respectively, with the remaining balance thereafter. Contract Assets and Liabilities The timing of revenue recognition may differ from the time of billing to the Company’s customers. Customer receivables represent an unconditional right to consideration net of an estimated allowance for doubtful accounts. Contract balances represent amounts from an arrangement when either the Company has performed, by transferring a solution to the customer in advance of receiving all or partial consideration for such goods and offerings from the customer, or the customer has made payment to the Company in advance of obtaining control of the goods and/or offerings promised to the customer in the contract. Contract liabilities arise when the Company bills its customers and receives consideration in advance of providing the goods or offerings promised in the contract. Contract liabilities are recognized as revenue when product offerings are provided to the customer. Contract liabilities are presented in the Company’s condensed consolidated balance sheet as deferred revenue. The following table presents information about the Company’s customer receivables, contract assets and contract liabilities as of September 30, 2019 and June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2019 June 30, 2019 ​ ​ (in millions) Customer receivable, net (1) ​ $ 86.6 ​ $ 136.4 Contract liabilities (1) ​ $ 47.1 ​ $ 50.5 (1) Amounts do not include balances associated with lease revenue from the Company’s Zayo Networks and zColo segments. During the three months ended September 30, 2019 and 2018, the Company recognized $4.8 million and $5.4 million, respectively, of revenue that was included in contract liabilities as of June 30, 2019 and June 30, 2018, respectively. Contract Costs The Company recognizes an asset for incremental commission and bonus expenses paid to internal sales personnel and third party agents in conjunction with obtaining certain customer contracts. These costs are only deferred when the commissions are incremental and would not have been incurred absent the customer contract. Costs to obtain a contract are amortized and recorded ratably within selling, general and administrative expenses on the Company’s condensed consolidated statements of operations over the estimated contract term. The Company also defers costs incurred to fulfill contracts that relate directly to the contract, are expected to generate resources that will be used to satisfy the Company’s performance obligation under the contract and are expected to be recovered through revenue generated under the contract. Contract fulfillment costs are expensed to cost of service as the Company satisfies its performance obligations. These costs principally relate to direct costs associated with activating new customer solutions. The Company estimates the amortization period for its costs incurred to obtain and fulfill customer contracts at a portfolio level due to the similarities within its customer contract portfolios. Other costs, such as general costs or costs related to past performance obligations, are expensed as incurred. As of September 30, 2019 and June 30, 2019, the Company had $5.6 million and $5.7 million, respectively, of short-term unamortized contract costs included in other current assets and $4.5 million and $3.8 million, respectively, of long term unamortized contact contract costs included in other assets on its condensed consolidated balance sheets. During the three months ended September 30, 2019 and 2018, the Company recorded $1.7 million and $2.1 million, respectively, in selling, general and administrative expenses associated with the amortization of deferred contract costs. The amortization period for these contract costs ranges from 1 to 18 years .

LEASES

LEASES	3 Months Ended
	Sep. 30, 2019
LEASES
LEASES	(13) LEASES As previously discussed in Note 1, the Company adopted ASC 842 effective July 1, 2019 using the modified retrospective transition method at the adoption date. In addition, the Company elected the package of practical expedients permitted under the transition guidance which permits companies to carry forward the historical lease classification. Adoption of the new standard resulted in $527.6 million of ROU assets and $545.1 million of lease liabilities recorded as of July 1, 2019 . The standard did not materially impact the Company’s consolidated net income or cash flows in the three months ended September 30, 2019. The Company’s financial position for reporting periods beginning on or after July 1, 2019 are presented under the new guidance, while prior period amounts are not adjusted for the new guidance and continue to be reported in accordance with previous guidance. Leases as Lessee The Company determines if an arrangement is a lease at inception and whether that lease meets the classification criteria of a finance or operating lease in accordance with U.S. GAAP. The Company leases office space, warehouse space, network assets, switching and transport sites, points of presence, components and equipment under non-cancelable operating leases. For leases with an initial term of 12 months or less, the Company recognizes lease expense on a straight-line basis over the lease term but does not recognize a ROU asset or lease liability. Operating lease assets have been included as right-of-use operating lease assets on the condensed consolidated balance sheets. The associated lease liabilities have been included as operating lease obligations, current or operating lease liabilities, non-current on the condensed consolidated balance sheets. ROU assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Variable lease payments consist of non-lease services related to the lease. Variable lease payments are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. As the Company’s leases as lessee typically do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The Company assessed multiple variables when determining the incremental borrowing rate, such as lease term, payment terms, collateral, economic conditions, and creditworthiness. ROU assets also include any lease payments made and exclude lease incentives. Rental expense for lease payments related to operating leases is recognized on a straight-line basis over the lease term. Some of the Company’s lease arrangements contain lease components and non-lease components. The Company generally accounts for each component separately based on the estimated standalone price of each component. For colocation leases, the Company accounts for the lease and non-lease components as a single lease component. Many of the Company’s lease agreements contain renewal options; however, the Company does not recognize ROU assets or lease liabilities for renewal periods unless it is determined the Company is reasonably certain of renewing the lease at inception or when a triggering event occurs. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain to be exercised. The Company’s lease agreements do not contain any material purchase option, material residual value guarantees or material restrictive covenants. Lease expense consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ ​ (in millions) Operating and short-term lease cost ​ ​ $ 57.9 Finance lease cost: ​ ​ ​ ​ Amortization of right-of-use assets ​ ​ ​ 3.5 Interest on lease liability ​ ​ ​ 2.9 Total finance lease cost ​ ​ ​ 6.4 Total lease cost ​ ​ $ 64.3 ​ Supplemental unaudited condensed consolidated balance sheet information and other information related to leases (in millions unless otherwise stated): ​ ​ ​ ​ ​ ​ ​ Leases ​ Classification on the Balance Sheet ​ As of September 30, 2019 ​ ​ ​ ​ (in millions) Assets ​ ​ ​ ​ ​ Operating lease assets ​ Right-of-use operating lease assets ​ $ 499.2 Finance lease assets ​ Property, plant and equipment, net of accumulated depreciation ​ ​ 153.8 Total leased assets ​ ​ ​ ​ 653.0 ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ Current ​ ​ ​ ​ ​ Operating ​ Operating lease obligations, current ​ $ 127.2 Finance ​ Finance lease obligation, current ​ ​ 9.5 Noncurrent ​ ​ ​ ​ ​ Operating ​ Operating lease liabilities, non-current ​ ​ 387.4 Finance ​ Finance lease obligations, non-current ​ ​ 176.0 Total lease liabilities ​ ​ ​ $ 700.1 ​ ​ ​ ​ ​ ​ Weighted-average remaining lease term (years) ​ ​ ​ ​ ​ Operating leases ​ ​ ​ ​ 7.1 Finance leases ​ ​ ​ ​ 11.9 Weighted-average discount rate ​ ​ ​ ​ ​ Operating leases ​ ​ ​ ​ 3.95% Finance leases ​ ​ ​ ​ 5.78% ​ Supplemental unaudited condensed consolidated cash flow statement information related to leases: ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ ​ (in millions) Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ Operating cash flows from operating leases ​ ​ $ 37.2 Operating cash flows from finance leases ​ ​ ​ 2.9 Finance cash flows from finance leases ​ ​ ​ 2.1 Total lease cost ​ ​ $ 42.2 ​ As of September 30, 2019, maturities of lease liabilities were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases Finance Leases Year Ended June 30, ​ ​ ​ (in millions) 2020 (remaining nine months) ​ ​ $ 95.5 ​ $ 15.4 2021 ​ ​ ​ 111.7 ​ ​ 20.1 2022 ​ ​ ​ 84.2 ​ ​ 20.3 2023 ​ ​ ​ 67.2 ​ ​ 20.1 2024 ​ ​ ​ 53.8 ​ ​ 19.3 Thereafter ​ ​ ​ 193.1 ​ ​ 180.3 Total lease payments ​ ​ $ 605.5 ​ $ 275.5 Less: interest ​ ​ ​ (90.9) ​ ​ (90.0) Total ​ ​ $ 514.6 ​ $ 185.5 Less: current portion ​ ​ ​ (127.2) ​ ​ (9.5) Long-term portion ​ ​ $ 387.4 ​ $ 176.0 ​ As of September 30, 2019, the Company had no material operating or finance leases that had not yet commenced. Future contractual payments under the terms of the Company’s finance lease obligations as of June 30, 2019 were as follows: ​ ​ ​ ​ ​ Year Ended June 30, ​ ​ (in millions) 2020 ​ ​ $ 20.1 2021 ​ ​ ​ 20.0 2022 ​ ​ ​ 20.3 2023 ​ ​ ​ 19.9 2024 ​ ​ ​ 19.5 Thereafter ​ ​ ​ 171.0 Total minimum lease payments ​ ​ ​ 270.8 Less amounts representing interest ​ ​ ​ (88.6) Less current portion ​ ​ ​ (10.0) Finance lease obligations, non-current ​ ​ $ 172.2 ​ Minimum contractual lease payments due under the Company’s long-term operating leases as of June 30, 2019 are as follows: ​ ​ ​ ​ ​ Year Ended June 30, ​ ​ (in millions) 2020 ​ ​ $ 128.1 2021 ​ ​ ​ 107.0 2022 ​ ​ ​ 83.7 2023 ​ ​ ​ 68.0 2024 ​ ​ ​ 55.7 Thereafter ​ ​ ​ 215.8 ​ ​ ​ $ 658.3 ​ Leases as Lessor As of September 30, 2019, maturities of non-cancellable leases were as follows: ​ ​ ​ ​ ​ Year Ended June 30, ​ ​ (in millions) 2020 (remaining nine months) ​ ​ $ 719.3 2021 ​ ​ ​ 728.7 2022 ​ ​ ​ 598.6 2023 ​ ​ ​ 496.4 2024 ​ ​ ​ 432.5 Thereafter ​ ​ ​ 399.3 Total lease payments ​ ​ $ 3,374.8 ​ The Company leases dark fiber and circuits (within the Zayo Networks segment) and zColo segments have contract terms that are accounted for as operating leases and are further described in Note 15 – Segment Reporting . Lease income is included in operating revenue in the condensed consolidated statements of operations. The Company’s lease revenue contains both minimum lease payments as well as variable lease payments. See Note 12 – Revenue and Contract Costs

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	3 Months Ended
	Sep. 30, 2019
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS	(14) RELATED-PARTY TRANSACTIONS Dan Caruso, the Company’s Chief Executive Officer and Chairman of the Board, is a party to an aircraft charter (or membership) agreement through his affiliate, Bear Equity LLC, for business and personal travel. Under the terms of the charter agreement, all fees for the use of the aircraft are effectively variable in nature. For his business travel on behalf of the Company, Mr. Caruso is reimbursed for his use of the aircraft subject to an annual maximum reimbursement threshold approved by the Company's Nominating and Governance Committee. In each of the three months ended September 30, 2019 and 2018, the Company reimbursed Mr. Caruso $0.1 million for his business use of the aircraft.

SEGMENT REPORTING

SEGMENT REPORTING	3 Months Ended
	Sep. 30, 2019
SEGMENT REPORTING
SEGMENT REPORTING	(15) SEGMENT REPORTING The Company uses the management approach to determine the segment financial information that should be disaggregated and presented separately in the Company's notes to its condensed consolidated financial statements. The management approach is based on the manner by which management has organized the segments within the Company for making operating decisions, allocating resources, and assessing performance. As the Company has increased in scope and scale, it has developed its management and reporting structure to support this growth. The Company’s bandwidth infrastructure, colocation and connectivity offerings are comprised of various related product groups generally defined around the type of offering to which the customer is licensing access, referred to as SPGs. Each SPG is responsible for the revenue, costs and associated capital expenditures of its respective solutions. The SPGs enable licensing and sales, make pricing and product decisions, engineer networks and deliver solutions to customers, and support customers for specific telecom and internet infrastructure requirements. During the fourth quarter of Fiscal 2019, with the continued increase in our scope and scale, our chief operating decision maker ("CODM"), who is our Chief Executive Officer, implemented certain organizational changes to the management and operation of the business that directly impact how the CODM makes resource allocation decisions and manages the Company. The changes in structure had the impact of combining our legacy Fiber Solutions, Transport and Enterprise segments into a single new segment, Zayo Networks and re-aligning our Cloud and Cybersecurity SPG from our legacy Enterprise segment to our zColo segment. These changes to our existing reportable segments have been recast for all prior period Zayo Networks Zayo Colocation (“zColo”). Europe. Solutions range in size from single cabinet solutions to 1MW+ data center infrastructure environments. Our data centers also support a large component of networking components for the purpose of aggregating and accommodating customers’ data, voice, internet and video traffic. The contract terms in this segment tend to range from two to five years. Allstream Other The Other segment is primarily comprised of Zayo Professional Services (“ZPS”). ZPS provides network and technical resources to customers who wish to leverage the Company’s expertise in designing, acquiring and maintaining a network. The contract terms typically run for The results of operations for each segment include an allocation of certain indirect costs and corporate related costs, including overhead and third party-financed debt. The allocation is based on a percentage that represents management’s estimate of the relative burden each segment bears of indirect and corporate costs. Management has evaluated the allocation methods utilized to allocate these costs and determined they are systematic, rational and consistently applied. Identifiable assets for each reportable segment are reconciled to total consolidated assets including unallocated corporate assets and intersegment eliminations. Unallocated corporate assets consist primarily of cash and deferred taxes. Segment Adjusted EBITDA Segment Adjusted EBITDA is the primary measure used by the Company’s CODM to evaluate segment operating performance. The Company defines Segment Adjusted EBITDA as earnings from operations before interest, income taxes, depreciation and amortization (“EBITDA”) adjusted to exclude acquisition or disposal-related transaction costs, losses on extinguishment of debt, stock-based compensation, unrealized foreign currency gains/(losses) on intercompany loans, gains/(losses) on business dispositions and non-cash income/(loss) on equity and cost method investments. The Company uses Segment Adjusted EBITDA to evaluate operating performance, and this financial measure is among the primary measures used by management for planning and forecasting of future periods. The Company believes the presentation of Segment Adjusted EBITDA is relevant and useful for investors because it allows investors to view results in a manner similar to the method used by management and facilitates comparison of the Company’s results with the results of other companies that have different financing and capital structures. Segment Adjusted EBITDA results, along with other quantitative and qualitative information, are also utilized by the Company and its Compensation Committee for purposes of determining bonus payouts to employees. Segment Adjusted EBITDA has limitations as an analytical tool and should not be considered in isolation from, or as a substitute for, analysis of the Company’s results from operations and operating cash flows as reported under GAAP. For example, Segment Adjusted EBITDA: ● ● ● ● The Company’s computation of Segment Adjusted EBITDA may not be comparable to other similarly titled measures computed by other companies because all companies do not calculate segment Adjusted EBITDA in the same manner. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of and for the Three Months Ended September 30, 2019 ​ Zayo Networks zColo Allstream Other Corp/ Total ​ ​ (in millions) Revenue from external customers $ 483.2 ​ $ 63.7 ​ $ 86.6 ​ $ 5.1 ​ $ — ​ $ 638.6 Segment Adjusted EBITDA ​ 277.5 ​ ​ 26.6 ​ ​ 9.3 ​ ​ 1.4 ​ ​ — ​ ​ 314.8 Total assets ​ ​ 7,992.4 ​ ​ 1,312.2 ​ ​ 388.6 ​ ​ 33.1 ​ ​ 154.8 ​ ​ 9,881.1 Capital expenditures ​ 194.8 ​ ​ 18.1 ​ ​ 4.2 ​ ​ — ​ ​ — ​ ​ 217.1 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended September 30, 2018 ​ Zayo Networks zColo Allstream Other Corp/ Total ​ ​ (in millions) Revenue from external customers $ 461.6 ​ $ 69.3 ​ $ 105.0 ​ $ 5.2 ​ $ — ​ $ 641.1 Segment Adjusted EBITDA ​ 266.2 ​ ​ 31.3 ​ ​ 20.8 ​ ​ 1.1 ​ ​ — ​ ​ 319.4 Capital expenditures ​ ​ 149.2 ​ ​ 28.7 ​ ​ 4.6 ​ ​ — ​ ​ — ​ ​ 182.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of June 30, 2019 ​ Zayo Networks zColo Allstream Other Corp/ Total ​ ​ (in millions) Total assets $ 7,677.4 ​ ​ 1,152.3 ​ ​ 376.9 ​ ​ 35.1 ​ ​ 92.1 ​ $ 9,333.8 ​ Reconciliation from Total Segment Adjusted EBITDA to income from operations before taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ 2019 ​ 2018 ​ ​ (in millions) Total Segment Adjusted EBITDA $ 314.8 ​ $ 319.4 Interest expense ​ (84.7) ​ ​ (82.2) Depreciation and amortization expense ​ (156.1) ​ ​ (167.8) Transaction costs ​ (2.0) ​ ​ (0.7) Stock-based compensation ​ (27.2) ​ ​ (26.7) Foreign currency loss on intercompany loans ​ (12.9) ​ ​ (4.6) Gain on business disposition ​ ​ — ​ ​ 5.5 Non-cash loss on investments ​ ​ — ​ ​ (0.3) Income from operations before income taxes ​ $ 31.9 ​ $ 42.6 ​

CONDENSED CONSOLIDATING FINANCI

CONDENSED CONSOLIDATING FINANCIAL INFORMATION	3 Months Ended
	Sep. 30, 2019
CONDENSED CONSOLIDATING FINANCIAL INFORMATION
CONDENSED CONSOLIDATING FINANCIAL INFORMATION	(16) CONDENSED CONSOLIDATING FINANCIAL INFORMATION As discussed Note 5 – Long-Term Debt operations. The non-guarantor subsidiaries consist of the foreign subsidiaries that were acquired in conjunction with the Company's acquisitions. The accompanying condensed consolidating financial information has been prepared and is presented to display the components of the Company’s balance sheets, statements of operations and statements of cash flows in a manner that allows an existing or future holder of the Company’s Notes to review and analyze the current financial position and recent operating results of the legal subsidiaries that guarantee the Company’s debt obligations. The operating activities of the separate legal entities included in the Company’s condensed consolidated financial statements are interdependent. The accompanying condensed consolidating financial information presents the results of operations, financial position and cash flows of each legal entity. Zayo Group and its guarantors provide services to each other during the normal course of business. These transactions are eliminated in the consolidated results of operations of the Company. Activity related to income taxes is included at the issuer, or Zayo Group level, and the Company's non-guarantor subsidiaries and is not allocated to the Company's guarantor subsidiaries in the condensed consolidated financial information presented below. ​ Condensed Consolidating Balance Sheets (Unaudited) September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 145.1 ​ $ 7.4 ​ $ 101.4 ​ $ — $ 253.9 Trade receivables, net of allowance ​ 92.5 ​ 1.4 ​ 58.0 ​ — ​ 151.9 Prepaid expenses ​ 55.1 ​ 0.2 ​ 12.8 ​ — ​ 68.1 Other current assets ​ 129.8 ​ — ​ (72.8) ​ — ​ 57.0 Total current assets ​ 422.5 ​ 9.0 ​ 99.4 ​ — ​ 530.9 Property and equipment, net ​ 5,055.9 ​ — ​ 795.9 ​ — ​ 5,851.8 Intangible assets, net ​ 963.3 ​ 6.9 ​ 122.6 ​ — ​ 1,092.8 Goodwill ​ ​ 1,520.4 ​ ​ 14.6 ​ ​ 166.1 ​ ​ — ​ ​ 1,701.1 Right-of-use operating lease assets ​ 328.7 ​ 1.9 ​ 168.6 ​ — ​ 499.2 Deferred income taxes, net ​ — ​ — ​ 21.3 ​ — ​ 21.3 Other assets ​ 149.3 ​ — ​ 34.7 ​ — ​ 184.0 Investment in subsidiary ​ ​ 635.2 ​ ​ — ​ ​ — ​ ​ (635.2) ​ ​ — Total assets ​ $ 9,075.3 ​ $ 32.4 ​ $ 1,408.6 ​ $ (635.2) ​ $ 9,881.1 Liabilities and member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 15.7 ​ $ 0.1 ​ $ 16.1 ​ $ — ​ $ 31.9 Accrued liabilities ​ 260.3 ​ 0.8 ​ 62.5 ​ — ​ 323.6 Accrued interest ​ 84.9 ​ — ​ — ​ — ​ 84.9 Current portion of long-term debt ​ ​ 130.0 ​ ​ — ​ ​ — ​ ​ — ​ ​ 130.0 Operating lease obligations, current ​ ​ 95.7 ​ ​ 1.8 ​ ​ 29.7 ​ ​ — ​ ​ 127.2 Finance lease obligations, current ​ ​ 8.3 ​ ​ — ​ ​ 1.2 ​ ​ — ​ ​ 9.5 Deferred revenue, current ​ 135.0 ​ 0.1 ​ 37.8 ​ — ​ 172.9 Total current liabilities ​ 729.9 ​ 2.8 ​ 147.3 ​ — ​ 880.0 Long-term debt, non-current ​ 5,318.4 ​ — ​ 377.7 ​ — ​ 5,696.1 Operating lease liabilities, non-current ​ ​ 252.1 ​ ​ — ​ ​ 135.3 ​ ​ — ​ ​ 387.4 Finance lease obligation, non-current ​ 167.5 ​ — ​ 8.5 ​ — ​ 176.0 Deferred revenue, non-current ​ 1,104.0 ​ — ​ 101.4 ​ — ​ 1,205.4 Deferred income taxes, net ​ 144.1 ​ — ​ 3.4 ​ — ​ 147.5 Other long-term liabilities ​ 0.7 ​ — ​ 29.4 ​ — ​ 30.1 Total liabilities ​ 7,716.7 ​ 2.8 ​ 803.0 ​ — ​ 8,522.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's interest ​ 1,611.5 ​ 10.1 ​ 445.5 ​ (464.6) ​ 1,602.5 Accumulated other comprehensive loss ​ (38.3) ​ — ​ (38.3) ​ 38.3 ​ (38.3) Accumulated deficit ​ (214.6) ​ 19.5 ​ 198.4 ​ (208.9) ​ (205.6) Total member's equity ​ 1,358.6 ​ 29.6 ​ 605.6 ​ (635.2) ​ 1,358.6 Total liabilities and member's equity ​ $ 9,075.3 ​ $ 32.4 ​ $ 1,408.6 ​ $ (635.2) ​ $ 9,881.1 ​ ​ Condensed Consolidating Balance Sheets (Unaudited) June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 85.9 ​ $ 9.6 ​ $ 89.9 ​ $ — $ 185.4 Trade receivables, net of allowance ​ 97.7 ​ 2.6 ​ 76.7 ​ — ​ 177.0 Prepaid expenses ​ 47.9 ​ 0.1 ​ 17.3 ​ — ​ 65.3 Other current assets ​ 131.4 ​ — ​ (74.6) ​ — ​ 56.8 Total current assets ​ 362.9 ​ 12.3 ​ 109.3 ​ — ​ 484.5 Property and equipment, net ​ 5,010.1 ​ — ​ 798.8 ​ — ​ 5,808.9 Intangible assets, net ​ 983.7 ​ 7.3 ​ 127.8 ​ — ​ 1,118.8 Goodwill ​ 1,520.3 ​ 14.6 ​ 171.7 ​ — ​ ​ 1,706.6 Deferred income taxes, net ​ 1.0 ​ ​ — ​ ​ 23.8 ​ ​ — ​ 24.8 Other assets ​ 152.4 ​ — ​ 37.8 ​ — ​ 190.2 Related party receivable ​ 358.9 ​ — ​ — ​ (358.9) ​ — Investment in subsidiary ​ ​ 664.1 ​ — ​ — ​ (664.1) ​ ​ — Total assets ​ $ 9,053.4 ​ $ 34.2 ​ $ 1,269.2 ​ $ (1,023.0) ​ $ 9,333.8 Liabilities and member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 53.2 ​ $ 0.5 ​ $ 20.0 ​ $ — ​ $ 73.7 Accrued liabilities ​ 243.4 ​ 1.4 ​ 70.0 ​ — ​ 314.8 Accrued interest ​ 73.1 ​ — ​ — ​ — ​ 73.1 Current portion of long-term debt ​ ​ 5.0 ​ ​ — ​ ​ — ​ ​ — ​ ​ 5.0 Finance lease obligations, current ​ ​ 8.6 ​ ​ — ​ ​ 1.4 ​ ​ — ​ ​ 10.0 Deferred revenue, current ​ 135.1 ​ 0.1 ​ 39.7 ​ — ​ 174.9 Total current liabilities ​ 518.4 ​ 2.0 ​ 131.1 ​ — ​ 651.5 Long-term debt, non-current ​ 5,839.7 ​ — ​ — ​ — ​ 5,839.7 Related party debt, long-term ​ ​ — ​ ​ — ​ ​ 358.9 ​ ​ (358.9) ​ ​ — Finance lease obligation, non-current ​ 163.4 ​ — ​ 8.8 ​ — ​ 172.2 Deferred revenue, non-current ​ 1,045.2 ​ — ​ 102.9 ​ — ​ 1,148.1 Deferred income taxes, net ​ 136.6 ​ — ​ 2.2 ​ — ​ 138.8 Other long-term liabilities ​ 21.3 ​ — ​ 33.4 ​ — ​ 54.7 Total liabilities ​ 7,724.6 ​ 2.0 ​ 637.3 ​ (358.9) ​ 8,005.0 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's interest ​ 1,587.4 ​ 13.5 ​ 462.6 ​ (487.3) ​ 1,576.2 Accumulated other comprehensive loss ​ (23.9) ​ — ​ (23.9) ​ 23.9 ​ (23.9) Accumulated deficit ​ (234.7) ​ 18.7 ​ 193.2 ​ (200.7) ​ (223.5) Total member's equity ​ 1,328.8 ​ 32.2 ​ 631.9 ​ (664.1) ​ 1,328.8 Total liabilities and member's equity ​ $ 9,053.4 ​ $ 34.2 ​ $ 1,269.2 ​ $ (1,023.0) ​ $ 9,333.8 ​ ​ Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Revenue ​ $ 507.0 ​ $ 5.1 ​ $ 126.5 ​ $ — ​ $ 638.6 Operating costs and expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating costs (excluding depreciation amortization and including stock-based compensation) ​ 169.9 ​ 3.4 ​ 57.7 ​ — ​ 231.0 Selling, general and administrative expenses (including stock-based compensation) ​ 95.4 ​ 0.4 ​ 26.8 ​ — ​ 122.6 Depreciation and amortization ​ 138.2 ​ 0.5 ​ 17.4 ​ — ​ 156.1 Total operating costs and expenses ​ 403.5 ​ 4.3 ​ 101.9 ​ — ​ 509.7 Operating income ​ 103.5 ​ 0.8 ​ 24.6 ​ — ​ 128.9 Other expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest expense ​ (79.1) ​ — ​ (5.6) ​ — ​ (84.7) Foreign currency loss on intercompany loans ​ (1.0) ​ — ​ (11.9) ​ — ​ (12.9) Other expense ​ 0.3 ​ — ​ 0.3 ​ — ​ 0.6 Equity in net earnings of subsidiaries ​ 8.2 ​ — ​ — ​ (8.2) ​ — Total other expense, net ​ (71.6) ​ — ​ (17.2) ​ (8.2) ​ (97.0) Income/(loss) from operations before income taxes ​ 31.9 ​ 0.8 ​ 7.4 ​ (8.2) ​ 31.9 Provision for income taxes ​ 11.8 ​ — ​ 2.2 ​ — ​ 14.0 Net income/(loss) ​ ​ 20.1 ​ ​ 0.8 ​ ​ 5.2 ​ ​ (8.2) ​ ​ 17.9 Other comprehensive (loss)/income, net of income taxes ​ ​ (14.4) ​ ​ — ​ ​ (14.4) ​ ​ 14.4 ​ ​ (14.4) Comprehensive income/(loss) ​ $ 5.7 ​ $ 0.8 ​ $ (9.2) ​ $ 6.2 ​ $ 3.5 ​ Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended September 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Revenue ​ $ 498.6 ​ $ 5.2 ​ $ 137.3 ​ $ — ​ $ 641.1 Operating costs and expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating costs (excluding depreciation amortization and including stock-based compensation) ​ 160.7 ​ 3.7 ​ 64.0 ​ — ​ 228.4 Selling, general and administrative expenses (including stock-based compensation) ​ 91.3 ​ 0.4 ​ 30.4 ​ — ​ 122.1 Depreciation and amortization ​ 146.0 ​ 0.5 ​ 21.3 ​ — ​ 167.8 Total operating costs and expenses ​ 398.0 ​ 4.6 ​ 115.7 ​ — ​ 518.3 Operating income ​ 100.6 ​ 0.6 ​ 21.6 ​ — ​ 122.8 Other expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest expense ​ (76.5) ​ — ​ (5.7) ​ — ​ (82.2) Foreign currency loss on intercompany loans ​ (2.2) ​ — ​ (2.4) ​ — ​ (4.6) Other expense ​ 6.2 ​ — ​ 0.4 ​ — ​ 6.6 Equity in net earnings of subsidiaries ​ 9.8 ​ — ​ — ​ (9.8) ​ — Total other expense, net ​ (62.7) ​ — ​ (7.7) ​ (9.8) ​ (80.2) Income/(loss) from operations before income taxes ​ 37.9 ​ 0.6 ​ 13.9 ​ (9.8) ​ 42.6 Provision for income taxes ​ 15.8 ​ — ​ 4.7 ​ — ​ 20.5 Net income/(loss) ​ ​ 22.1 ​ ​ 0.6 ​ ​ 9.2 ​ ​ (9.8) ​ ​ 22.1 Other comprehensive income/(loss), net of income taxes ​ ​ 6.3 ​ ​ — ​ ​ 6.3 ​ ​ (6.3) ​ ​ 6.3 Comprehensive income/(loss) ​ $ 28.4 ​ $ 0.6 ​ $ 15.5 ​ $ (16.1) ​ $ 28.4 ​ Condensed Consolidating Statements of Cash Flows For the Three Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Total ​ ​ (in millions) Net cash provided by operating activities ​ $ 277.2 $ 1.4 $ 33.2 ​ $ 311.8 Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases of property and equipment ​ (184.3) ​ — ​ (32.8) ​ (217.1) Net cash used in investing activities ​ (184.3) ​ — ​ (32.8) ​ ​ (217.1) Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Principal payments on long-term debt ​ ​ (21.3) ​ ​ — ​ ​ — ​ ​ (21.3) Principal repayments on finance lease obligations ​ ​ (2.0) ​ ​ — ​ ​ (0.1) ​ ​ (2.1) Contributions to parent ​ ​ (9.5) ​ ​ (3.6) ​ ​ 13.1 ​ ​ — Net cash (used in)/ provided by financing activities ​ (32.8) ​ (3.6) ​ 13.0 ​ (23.4) Effect of changes in foreign exchange rates on cash ​ — ​ — ​ (2.7) ​ (2.7) Net increase/(decrease) in cash, cash equivalents and restricted cash ​ 60.1 ​ (2.2) ​ 10.7 ​ 68.6 Cash, cash equivalents and restricted cash, beginning of year ​ 86.3 ​ 9.6 ​ 90.7 ​ 186.6 Cash, cash equivalents and restricted cash, end of period ​ $ 146.4 ​ $ 7.4 ​ $ 101.4 ​ $ 255.2 ​ Condensed Consolidating Statements of Cash Flows For the Three Months Ended September 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Total ​ ​ (in millions) Net cash provided by operating activities ​ $ 212.0 $ 3.1 $ 26.7 ​ $ 241.8 Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases of property and equipment ​ (150.5) ​ — ​ (32.0) ​ (182.5) Proceeds from sale of SRT, net of cash held in escrow ​ ​ 39.0 ​ — ​ — ​ 39.0 Net cash used in investing activities ​ (111.5) ​ — ​ (32.0) ​ ​ (143.5) Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Principal payments on long-term debt ​ ​ (1.3) ​ ​ — ​ ​ — ​ ​ (1.3) Principal repayments on finance lease obligations ​ ​ (1.6) ​ ​ — ​ ​ (0.3) ​ ​ (1.9) Payments to repurchase ZGH common stock ​ ​ (0.2) ​ ​ — ​ ​ — ​ ​ (0.2) Contributions to parent ​ ​ (8.7) ​ ​ (1.6) ​ ​ 10.3 ​ ​ — Cash paid for Santa Clara acquisition ​ ​ (3.3) ​ ​ — ​ ​ — ​ ​ (3.3) Net cash (used in)/provided by financing activities ​ (15.1) ​ (1.6) ​ 10.0 ​ (6.7) Effect of changes in foreign exchange rates on cash ​ — ​ — ​ 2.2 ​ 2.2 Net increase in cash, cash equivalents and restricted cash ​ 85.4 ​ 1.5 ​ 6.9 ​ 93.8 Cash, cash equivalents and restricted cash, beginning of year ​ 142.7 ​ 5.9 ​ 112.0 ​ 260.6 Cash, cash equivalents and restricted cash, end of period ​ $ 228.1 ​ $ 7.4 ​ $ 118.9 ​ $ 354.4 ​

BUSINESS AND BASIS OF PRESENT_2

BUSINESS AND BASIS OF PRESENTATION (Policies)	3 Months Ended
	Sep. 30, 2019
BUSINESS AND BASIS OF PRESENTATION
Business	Business Zayo Group, LLC, a Delaware limited liability company, was formed on May 4, 2007, and is the operating parent company of a number of subsidiaries engaged in providing access to bandwidth infrastructure. Zayo Group LLC and its subsidiaries are collectively referred to as “Zayo Group” or the “Company.” The Company is a wholly-owned subsidiary of Zayo Group Holdings, Inc. (“ZGH”). ● ● Zayo Colocation (“zColo”), including provision of colocation space and power and interconnection offerings, and cloud-based computing offerings. ● Allstream, including Cloud VoIP and Data Solutions. ● Other offerings, including Zayo Professional Services (“ZPS”).
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements include all the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated in consolidation. The accompanying condensed consolidated financial statements and related notes are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q, and do not include all of the note disclosures required by GAAP for complete financial statements. These condensed consolidated financial statements should, therefore, be read in conjunction with the consolidated financial statements and notes thereto for the year ended June 30, 2019 included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2019. In the opinion of management, all adjustments considered necessary for a fair presentation of financial position, results of operations and cash flows of the Company have been included herein. The results of operations for the three months ended September 30, 2019 are not necessarily indicative of the operating results for any future interim period or the full year. Unless otherwise noted, dollar amounts and disclosures throughout the notes to the condensed consolidated financial statements are presented in millions of dollars. The Company’s fiscal year ends June 30 each year, and we refer to the fiscal year ending June 30, 2020 as “Fiscal 2020” and the fiscal year ended June 30, 2019 as “Fiscal 2019.”
Use of Estimates	Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Estimates are used when establishing allowances for doubtful accounts and accruals for billing disputes, determining useful lives for depreciation and amortization and accruals for exit activities associated with real estate leases, assessing the need for impairment charges (including those related to intangible assets and goodwill), determining the fair values of assets acquired and liabilities assumed in business combinations, accounting for income taxes and related valuation allowances against deferred tax assets, determining the defined benefit costs and defined benefit obligations related to post-employment benefits, selection of the discount rate used to value lease liabilities, determining the fair value of nonmonetary exchanges, determining the fair value of plan assets related to post-employment benefits and estimating certain restricted stock unit grant fair values used to compute the stock-based compensation liability and expense. Management evaluates these estimates and judgments on an ongoing basis and makes estimates based on historical experience, current conditions, and various other assumptions that are believed to be reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from these estimates under different assumptions or conditions.
Recently Adopted and Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, " Measurement of Credit Losses on Financial Instruments ." The primary impact of ASU 2016-13 for us is a change in the model for the recognition of credit losses related to our financial instruments from an incurred loss model, which recognized credit losses only if it was probable a loss had been incurred, to an expected loss model, which requires our management team to estimate the total credit losses expected on the portfolio of financial instruments. We are currently reviewing the requirements of the standard and evaluating the impact on our consolidated financial statements. We are required to adopt the provisions of ASU 2016-13 no later than July 1, 2020. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases The Company adopted ASC 842 effective July 1, 2019 using the modified retrospective transition method. Under this method, the Company recognized a cumulative effect adjustment in the first quarter of Fiscal 2020, rather than restating any prior periods. Comparative information for prior periods has not been restated and continues to be reported in accordance with Topic 840. The Company elected the package of practical expedients permitted under the transition guidance, which does not require reassessment of prior conclusions related to contracts containing a lease, lease classification and initial direct lease costs. As an accounting policy election, the Company will exclude short-term leases (term of 12 months or less) from the balance sheet presentation and will account for non-lease and lease components in a contract as a single lease component for certain asset classes. The Company also elected the land easements practical expedient which permits the Company to carry forward the historical accounting treatment for agreements entered into prior to the adoption date. The adoption of ASC 842 impacted the Company’s condensed consolidated balance sheet with the recognition of existing operating leases as lessee resulting in $527.6 million of right-of-use (“ROU”) assets and $545.1 million of lease liabilities recorded as of July 1, 2019. The standard did not materially impact the Company’s consolidated net earnings or cash flows for the three months ended September 30, 2019. As lessor, accounting for the Company’s leases remains largely unchanged from ASC 840. The Company leases dark fiber and circuits (within the Zayo Networks segment) and provides leases of colocation space (within the zColo segment) which have contract terms that are accounted for as operating leases and are further described in Note 15 – Segment Reporting

GOODWILL (Tables)

GOODWILL (Tables)	3 Months Ended
	Sep. 30, 2019
GOODWILL
Schedule of Goodwill	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Product Group As of June 30, 2019 Foreign Currency As of September 30, 2019 ​ ​ (in millions) Fiber Solutions ​ $ 1,000.9 ​ $ (3.2) ​ $ 997.7 Layer 2/3 ​ ​ 200.8 ​ ​ (0.7) ​ ​ 200.1 Transport ​ ​ 176.2 ​ ​ (0.6) ​ ​ 175.6 zColo ​ ​ 259.6 ​ ​ (1.0) ​ ​ 258.6 Cloud ​ ​ 14.7 ​ ​ — ​ ​ 14.7 Allstream ​ ​ 39.0 ​ ​ — ​ ​ 39.0 Other ​ ​ 15.4 ​ ​ — ​ ​ 15.4 Total ​ $ 1,706.6 ​ $ (5.5) ​ $ 1,701.1

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	3 Months Ended
	Sep. 30, 2019
INTANGIBLE ASSETS
Schedule of Identifiable Acquisition Related Intangible Assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Carrying Amount Accumulated Net ​ ​ (in millions) September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ Finite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 1,550.6 ​ $ (477.0) ​ $ 1,073.6 Underlying rights and other ​ ​ 3.4 ​ ​ (1.7) ​ ​ 1.7 Total ​ ​ 1,554.0 ​ ​ (478.7) ​ ​ 1,075.3 Indefinite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Certifications ​ ​ 3.5 ​ ​ — ​ ​ 3.5 Underlying rights and other ​ ​ 14.0 ​ ​ — ​ ​ 14.0 Total ​ $ 1,571.5 ​ $ (478.7) ​ $ 1,092.8 June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ Finite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 1,597.6 ​ $ (498.7) ​ $ 1,098.9 Underlying rights and other ​ ​ 3.4 ​ ​ (1.5) ​ ​ 1.9 Total ​ ​ 1,601.0 ​ ​ (500.2) ​ ​ 1,100.8 Indefinite-Lived Intangible Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Certifications ​ ​ 3.5 ​ ​ — ​ ​ 3.5 Underlying rights and other ​ ​ 14.5 ​ ​ — ​ ​ 14.5 Total ​ $ 1,619.0 ​ $ (500.2) ​ $ 1,118.8

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	3 Months Ended
	Sep. 30, 2019
LONG-TERM DEBT
Schedule of Debt	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Date of ​ ​ ​ Outstanding as of ​ ​ ​ Issuance or most Maturity Interest Interest Rate September 30, 2019 June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in millions) Term Loan Facility due 2021 ​ Jan 2017 ​ Jan 2021 ​ Monthly ​ LIBOR +2.00% ​ $ 487.5 ​ $ 488.7 ​ B-2 Term Loan Facility ​ Feb 2018 ​ Jan 2024 ​ Monthly ​ LIBOR +2.25% ​ ​ 1,269.3 ​ ​ 1,269.3 ​ 6.00% Senior Unsecured Notes ​ Jan & Mar 2015 ​ Apr 2023 ​ Apr/Oct ​ 6.00% ​ ​ 1,430.0 ​ ​ 1,430.0 ​ 6.375% Senior Unsecured Notes ​ May 2015 & Apr 2016 ​ May 2025 ​ May/Nov ​ 6.375% ​ ​ 900.0 ​ ​ 900.0 ​ 5.75% Senior Unsecured Notes ​ Jan, Apr & Jul 2017 ​ Jan 2027 ​ Jan/Jul ​ 5.75% ​ ​ 1,650.0 ​ ​ 1,650.0 ​ Revolving Loan Facility ​ Jan/Apr 2019 (1) ​ Jul 2020 (2) ​ Monthly ​ LIBOR +1.75% ​ ​ 125.0 ​ ​ 145.0 ​ Total obligations ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5,861.8 ​ ​ 5,883.0 ​ Unamortized premium, net ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 11.9 ​ ​ 11.9 ​ Unamortized debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (47.6) ​ ​ (50.2) ​ Carrying value of debt ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5,826.1 ​ ​ 5,844.7 ​ Less current portion (2) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (130.0) ​ ​ (5.0) ​ Total long-term debt, less current portion ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 5,696.1 ​ $ 5,839.7 ​ (1) The most recent borrowings under the Revolving Loan Facility occurred in January 2019 and the most recent amendment on the Revolving Loan Facility was April 2019. (2) The earliest possible maturity under the Extension Amendment No. 1 entered into on April 3, 2019 is July 2020 and as a result, the Revolving Loan Facility is classified as current. See below for further details.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Sep. 30, 2019
INCOME TAXES
Schedule of Reconciliation of Income Tax Provision	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ 2019 2018 ​ ​ (in millions) Expected provision at the statutory rate ​ $ 6.7 ​ $ 8.9 Increase/(decrease) due to: ​ ​ ​ ​ ​ ​ Stock-based compensation ​ ​ 0.7 ​ ​ 1.1 State income taxes expense, net of federal benefit ​ ​ 1.9 ​ ​ 1.5 Change in statutory tax rate, outside U.S. ​ ​ — ​ ​ (0.1) Change in uncertain tax benefits ​ ​ 1.0 ​ ​ — Foreign tax rate differential ​ ​ 1.2 ​ ​ 0.2 State NOL expirations ​ ​ 1.6 ​ ​ — U.S. Tax Reform ​ ​ — ​ ​ 7.6 Change in valuation allowance ​ ​ — ​ ​ (0.3) Other, net ​ ​ 0.9 ​ ​ 1.6 Provision for income taxes ​ $ 14.0 ​ $ 20.5

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Sep. 30, 2019
Schedule of Employee Service Share-Based Compensation Allocation of Recognized Period Costs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ ​ 2019 2018 ​ ​ (in millions) Included in: ​ ​ ​ ​ ​ ​ Operating costs ​ $ 3.2 ​ $ 2.7 Selling, general and administrative expenses ​ ​ 24.0 ​ ​ 24.0 Total stock-based compensation expense ​ $ 27.2 ​ $ 26.7 ​ ​ ​ ​ ​ ​ ​ Part A restricted stock units ​ $ 22.7 ​ $ 23.3 Part B restricted stock units ​ ​ 3.8 ​ ​ 2.9 Part C restricted stock units ​ ​ 0.7 ​ ​ 0.5 Total stock-based compensation expense ​ $ 27.2 ​ $ 26.7
Summary of Part B RSU Issuance	​ ​ ​ ​ ​ ​ ​ During the Three Months Ended ​ ​ September 30, 2019 Part B RSUs granted ​ ​ 64,705 Maximum eligible shares of ZGH’s common stock ​ ​ 446,465 Grant date fair value per Part B RSU ​ $ 69.86 Units converted to ZGH’s common stock at vesting date ​ ​ n/a ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ During the Three Months Ended ​ ​ June 30, 2019 March 31, 2019 December 31, 2018 September 30, 2018 Part B RSUs granted ​ 75,370 ​ ​ 98,342 ​ ​ 61,123 ​ ​ 58,418 Maximum eligible shares of ZGH's common stock ​ ​ 520,053 ​ ​ 678,560 ​ ​ 421,749 ​ ​ 403,084 Grant date fair value per Part B RSU ​ $ 63.67 ​ $ 52.81 ​ $ 22.43 ​ $ 64.41 Units converted to ZGH's common stock at vesting date ​ ​ n/a ​ ​ n/a ​ ​ n/a ​ ​ —
Part A restricted stock units
Summary of Restricted Stock Unit Activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Number of Part A Weighted average ​ Weighted average Outstanding at July 1, 2019 ​ ​ 2,324,396 ​ $ 28.49 ​ ​ 6.6 Granted ​ ​ 640,191 ​ ​ 33.73 ​ ​ ​ Vested ​ ​ (552,064) ​ ​ 25.93 ​ ​ ​ Forfeited ​ ​ (74,448) ​ ​ n/a ​ ​ ​ Outstanding at September 30, 2019 ​ ​ 2,338,075 ​ $ 30.39 ​ ​ 5.8
Part B restricted stock units
Summary of Restricted Stock Unit Activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Number of Part B Weighted average ​ Weighted average Outstanding at July 1, 2019 ​ ​ 289,254 ​ $ 49.73 ​ ​ 8.0 Granted ​ ​ 64,705 ​ ​ 69.86 ​ ​ ​ Vested ​ ​ (57,336) ​ ​ 64.41 ​ ​ ​ Forfeited ​ ​ — ​ ​ n/a ​ ​ ​ Outstanding at September 30, 2019 ​ ​ 296,623 ​ $ 51.28 ​ ​ 7.5

EMPLOYEE BENEFITS (Tables)

EMPLOYEE BENEFITS (Tables)	3 Months Ended
	Sep. 30, 2019
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Schedule of net periodic (benefit) cost of the defined benefit pension and OPEB is included in selling, general and administrative expenses	​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plans ​ ​ Three Months Ended September 30, ​ 2019 ​ 2018 ​ ​ (in millions) Service cost ​ $ 0.6 ​ $ 0.8 Interest cost ​ ​ 0.9 ​ ​ 0.9 Expected return on plan assets ​ ​ (1.3) ​ ​ (1.4) Amortization of service cost from earlier periods ​ ​ 0.2 ​ ​ 0.2 Gain on curtailment (1) ​ ​ — ​ ​ (0.4) Net periodic pension benefit cost ​ $ 0.4 ​ $ 0.1 ​ (1) During the three months ended September 30, 2018, the Company approved an amendment to the defined benefit pension plan freezing benefit accruals for certain members of the pension plan as of September 30, 2018. The plan freeze had an immaterial impact to the financial statements for the period ended September 30, 2018.
OPEB Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Schedule of net periodic (benefit) cost of the defined benefit pension and OPEB is included in selling, general and administrative expenses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPEB Plans ​ ​ Three Months Ended September 30, ​ 2019 ​ 2018 ​ (in millions) Interest cost ​ $ 0.1 ​ ​ 0.1 Net periodic OPEB benefit cost ​ $ 0.1 ​ $ 0.1

REVENUE AND CONTRACT COSTS (Tab

REVENUE AND CONTRACT COSTS (Tables)	3 Months Ended
	Sep. 30, 2019
REVENUE AND CONTRACT COSTS
Schedule of Reconciliation Of Revenue From Contract With Customers	​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ 2019 2018 ​ ​ (in millions) Revenue from Contracts with Customers - ASC 606 ​ $ 346.9 ​ ​ 380.9 Lease Revenue - ASC 842 (1) ​ ​ 291.7 ​ ​ 260.2 Total revenue ​ $ 638.6 ​ $ 641.1 (1) Includes revenue from use of long-term Fiber Contracts and Colocation solutions, which are not within the scope of ASC 606. See Note 13 – Leases .
Schedule of Customer Receivables, Contract Assets and Contract Liabilities	​ ​ ​ ​ ​ ​ ​ ​ September 30, 2019 June 30, 2019 ​ ​ (in millions) Customer receivable, net (1) ​ $ 86.6 ​ $ 136.4 Contract liabilities (1) ​ $ 47.1 ​ $ 50.5 (1) Amounts do not include balances associated with lease revenue from the Company’s Zayo Networks and zColo segments.

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Sep. 30, 2019
LEASES
Summary of components of lease expense	Lease expense consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ ​ (in millions) Operating and short-term lease cost ​ ​ $ 57.9 Finance lease cost: ​ ​ ​ ​ Amortization of right-of-use assets ​ ​ ​ 3.5 Interest on lease liability ​ ​ ​ 2.9 Total finance lease cost ​ ​ ​ 6.4 Total lease cost ​ ​ $ 64.3 ​ Supplemental unaudited condensed consolidated balance sheet information and other information related to leases (in millions unless otherwise stated): ​ ​ ​ ​ ​ ​ ​ Leases ​ Classification on the Balance Sheet ​ As of September 30, 2019 ​ ​ ​ ​ (in millions) Assets ​ ​ ​ ​ ​ Operating lease assets ​ Right-of-use operating lease assets ​ $ 499.2 Finance lease assets ​ Property, plant and equipment, net of accumulated depreciation ​ ​ 153.8 Total leased assets ​ ​ ​ ​ 653.0 ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ Current ​ ​ ​ ​ ​ Operating ​ Operating lease obligations, current ​ $ 127.2 Finance ​ Finance lease obligation, current ​ ​ 9.5 Noncurrent ​ ​ ​ ​ ​ Operating ​ Operating lease liabilities, non-current ​ ​ 387.4 Finance ​ Finance lease obligations, non-current ​ ​ 176.0 Total lease liabilities ​ ​ ​ $ 700.1 ​ ​ ​ ​ ​ ​ Weighted-average remaining lease term (years) ​ ​ ​ ​ ​ Operating leases ​ ​ ​ ​ 7.1 Finance leases ​ ​ ​ ​ 11.9 Weighted-average discount rate ​ ​ ​ ​ ​ Operating leases ​ ​ ​ ​ 3.95% Finance leases ​ ​ ​ ​ 5.78% ​ Supplemental unaudited condensed consolidated cash flow statement information related to leases: ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ ​ (in millions) Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ Operating cash flows from operating leases ​ ​ $ 37.2 Operating cash flows from finance leases ​ ​ ​ 2.9 Finance cash flows from finance leases ​ ​ ​ 2.1 Total lease cost ​ ​ $ 42.2
Schedule of supplemental unaudited condensed consolidated balance sheet information and other information related to leases	​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ ​ (in millions) Operating and short-term lease cost ​ ​ $ 57.9 Finance lease cost: ​ ​ ​ ​ Amortization of right-of-use assets ​ ​ ​ 3.5 Interest on lease liability ​ ​ ​ 2.9 Total finance lease cost ​ ​ ​ 6.4 Total lease cost ​ ​ $ 64.3
Schedule of supplemental unaudited condensed consolidated cash flow statement information related to leases	​ ​ ​ ​ ​ ​ ​ Leases ​ Classification on the Balance Sheet ​ As of September 30, 2019 ​ ​ ​ ​ (in millions) Assets ​ ​ ​ ​ ​ Operating lease assets ​ Right-of-use operating lease assets ​ $ 499.2 Finance lease assets ​ Property, plant and equipment, net of accumulated depreciation ​ ​ 153.8 Total leased assets ​ ​ ​ ​ 653.0 ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ Current ​ ​ ​ ​ ​ Operating ​ Operating lease obligations, current ​ $ 127.2 Finance ​ Finance lease obligation, current ​ ​ 9.5 Noncurrent ​ ​ ​ ​ ​ Operating ​ Operating lease liabilities, non-current ​ ​ 387.4 Finance ​ Finance lease obligations, non-current ​ ​ 176.0 Total lease liabilities ​ ​ ​ $ 700.1 ​ ​ ​ ​ ​ ​ Weighted-average remaining lease term (years) ​ ​ ​ ​ ​ Operating leases ​ ​ ​ ​ 7.1 Finance leases ​ ​ ​ ​ 11.9 Weighted-average discount rate ​ ​ ​ ​ ​ Operating leases ​ ​ ​ ​ 3.95% Finance leases ​ ​ ​ ​ 5.78%
Summary of maturities of our lease liabilities	As of September 30, 2019, maturities of lease liabilities were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases Finance Leases Year Ended June 30, ​ ​ ​ (in millions) 2020 (remaining nine months) ​ ​ $ 95.5 ​ $ 15.4 2021 ​ ​ ​ 111.7 ​ ​ 20.1 2022 ​ ​ ​ 84.2 ​ ​ 20.3 2023 ​ ​ ​ 67.2 ​ ​ 20.1 2024 ​ ​ ​ 53.8 ​ ​ 19.3 Thereafter ​ ​ ​ 193.1 ​ ​ 180.3 Total lease payments ​ ​ $ 605.5 ​ $ 275.5 Less: interest ​ ​ ​ (90.9) ​ ​ (90.0) Total ​ ​ $ 514.6 ​ $ 185.5 Less: current portion ​ ​ ​ (127.2) ​ ​ (9.5) Long-term portion ​ ​ $ 387.4 ​ $ 176.0 Future contractual payments under the terms of the Company’s finance lease obligations as of June 30, 2019 were as follows: ​ ​ ​ ​ ​ Year Ended June 30, ​ ​ (in millions) 2020 ​ ​ $ 20.1 2021 ​ ​ ​ 20.0 2022 ​ ​ ​ 20.3 2023 ​ ​ ​ 19.9 2024 ​ ​ ​ 19.5 Thereafter ​ ​ ​ 171.0 Total minimum lease payments ​ ​ ​ 270.8 Less amounts representing interest ​ ​ ​ (88.6) Less current portion ​ ​ ​ (10.0) Finance lease obligations, non-current ​ ​ $ 172.2
Summary of maturities of our lease liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases Finance Leases Year Ended June 30, ​ ​ ​ (in millions) 2020 (remaining nine months) ​ ​ $ 95.5 ​ $ 15.4 2021 ​ ​ ​ 111.7 ​ ​ 20.1 2022 ​ ​ ​ 84.2 ​ ​ 20.3 2023 ​ ​ ​ 67.2 ​ ​ 20.1 2024 ​ ​ ​ 53.8 ​ ​ 19.3 Thereafter ​ ​ ​ 193.1 ​ ​ 180.3 Total lease payments ​ ​ $ 605.5 ​ $ 275.5 Less: interest ​ ​ ​ (90.9) ​ ​ (90.0) Total ​ ​ $ 514.6 ​ $ 185.5 Less: current portion ​ ​ ​ (127.2) ​ ​ (9.5) Long-term portion ​ ​ $ 387.4 ​ $ 176.0 Minimum contractual lease payments due under the Company’s long-term operating leases as of June 30, 2019 are as follows: ​ ​ ​ ​ ​ Year Ended June 30, ​ ​ (in millions) 2020 ​ ​ $ 128.1 2021 ​ ​ ​ 107.0 2022 ​ ​ ​ 83.7 2023 ​ ​ ​ 68.0 2024 ​ ​ ​ 55.7 Thereafter ​ ​ ​ 215.8 ​ ​ ​ $ 658.3
Schedule of maturities of non-cancellable leases	As of September 30, 2019, maturities of non-cancellable leases were as follows: ​ ​ ​ ​ ​ Year Ended June 30, ​ ​ (in millions) 2020 (remaining nine months) ​ ​ $ 719.3 2021 ​ ​ ​ 728.7 2022 ​ ​ ​ 598.6 2023 ​ ​ ​ 496.4 2024 ​ ​ ​ 432.5 Thereafter ​ ​ ​ 399.3 Total lease payments ​ ​ $ 3,374.8

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	3 Months Ended
	Sep. 30, 2019
SEGMENT REPORTING
Summary of Financial Information by Segments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of and for the Three Months Ended September 30, 2019 ​ Zayo Networks zColo Allstream Other Corp/ Total ​ ​ (in millions) Revenue from external customers $ 483.2 ​ $ 63.7 ​ $ 86.6 ​ $ 5.1 ​ $ — ​ $ 638.6 Segment Adjusted EBITDA ​ 277.5 ​ ​ 26.6 ​ ​ 9.3 ​ ​ 1.4 ​ ​ — ​ ​ 314.8 Total assets ​ ​ 7,992.4 ​ ​ 1,312.2 ​ ​ 388.6 ​ ​ 33.1 ​ ​ 154.8 ​ ​ 9,881.1 Capital expenditures ​ 194.8 ​ ​ 18.1 ​ ​ 4.2 ​ ​ — ​ ​ — ​ ​ 217.1 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended September 30, 2018 ​ Zayo Networks zColo Allstream Other Corp/ Total ​ ​ (in millions) Revenue from external customers $ 461.6 ​ $ 69.3 ​ $ 105.0 ​ $ 5.2 ​ $ — ​ $ 641.1 Segment Adjusted EBITDA ​ 266.2 ​ ​ 31.3 ​ ​ 20.8 ​ ​ 1.1 ​ ​ — ​ ​ 319.4 Capital expenditures ​ ​ 149.2 ​ ​ 28.7 ​ ​ 4.6 ​ ​ — ​ ​ — ​ ​ 182.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of June 30, 2019 ​ Zayo Networks zColo Allstream Other Corp/ Total ​ ​ (in millions) Total assets $ 7,677.4 ​ ​ 1,152.3 ​ ​ 376.9 ​ ​ 35.1 ​ ​ 92.1 ​ $ 9,333.8

CONDENSED CONSOLIDATING FINAN_2

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables)	3 Months Ended
	Sep. 30, 2019
CONDENSED CONSOLIDATING FINANCIAL INFORMATION
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets (Unaudited) September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 145.1 ​ $ 7.4 ​ $ 101.4 ​ $ — $ 253.9 Trade receivables, net of allowance ​ 92.5 ​ 1.4 ​ 58.0 ​ — ​ 151.9 Prepaid expenses ​ 55.1 ​ 0.2 ​ 12.8 ​ — ​ 68.1 Other current assets ​ 129.8 ​ — ​ (72.8) ​ — ​ 57.0 Total current assets ​ 422.5 ​ 9.0 ​ 99.4 ​ — ​ 530.9 Property and equipment, net ​ 5,055.9 ​ — ​ 795.9 ​ — ​ 5,851.8 Intangible assets, net ​ 963.3 ​ 6.9 ​ 122.6 ​ — ​ 1,092.8 Goodwill ​ ​ 1,520.4 ​ ​ 14.6 ​ ​ 166.1 ​ ​ — ​ ​ 1,701.1 Right-of-use operating lease assets ​ 328.7 ​ 1.9 ​ 168.6 ​ — ​ 499.2 Deferred income taxes, net ​ — ​ — ​ 21.3 ​ — ​ 21.3 Other assets ​ 149.3 ​ — ​ 34.7 ​ — ​ 184.0 Investment in subsidiary ​ ​ 635.2 ​ ​ — ​ ​ — ​ ​ (635.2) ​ ​ — Total assets ​ $ 9,075.3 ​ $ 32.4 ​ $ 1,408.6 ​ $ (635.2) ​ $ 9,881.1 Liabilities and member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 15.7 ​ $ 0.1 ​ $ 16.1 ​ $ — ​ $ 31.9 Accrued liabilities ​ 260.3 ​ 0.8 ​ 62.5 ​ — ​ 323.6 Accrued interest ​ 84.9 ​ — ​ — ​ — ​ 84.9 Current portion of long-term debt ​ ​ 130.0 ​ ​ — ​ ​ — ​ ​ — ​ ​ 130.0 Operating lease obligations, current ​ ​ 95.7 ​ ​ 1.8 ​ ​ 29.7 ​ ​ — ​ ​ 127.2 Finance lease obligations, current ​ ​ 8.3 ​ ​ — ​ ​ 1.2 ​ ​ — ​ ​ 9.5 Deferred revenue, current ​ 135.0 ​ 0.1 ​ 37.8 ​ — ​ 172.9 Total current liabilities ​ 729.9 ​ 2.8 ​ 147.3 ​ — ​ 880.0 Long-term debt, non-current ​ 5,318.4 ​ — ​ 377.7 ​ — ​ 5,696.1 Operating lease liabilities, non-current ​ ​ 252.1 ​ ​ — ​ ​ 135.3 ​ ​ — ​ ​ 387.4 Finance lease obligation, non-current ​ 167.5 ​ — ​ 8.5 ​ — ​ 176.0 Deferred revenue, non-current ​ 1,104.0 ​ — ​ 101.4 ​ — ​ 1,205.4 Deferred income taxes, net ​ 144.1 ​ — ​ 3.4 ​ — ​ 147.5 Other long-term liabilities ​ 0.7 ​ — ​ 29.4 ​ — ​ 30.1 Total liabilities ​ 7,716.7 ​ 2.8 ​ 803.0 ​ — ​ 8,522.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's interest ​ 1,611.5 ​ 10.1 ​ 445.5 ​ (464.6) ​ 1,602.5 Accumulated other comprehensive loss ​ (38.3) ​ — ​ (38.3) ​ 38.3 ​ (38.3) Accumulated deficit ​ (214.6) ​ 19.5 ​ 198.4 ​ (208.9) ​ (205.6) Total member's equity ​ 1,358.6 ​ 29.6 ​ 605.6 ​ (635.2) ​ 1,358.6 Total liabilities and member's equity ​ $ 9,075.3 ​ $ 32.4 ​ $ 1,408.6 ​ $ (635.2) ​ $ 9,881.1 ​ ​ Condensed Consolidating Balance Sheets (Unaudited) June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 85.9 ​ $ 9.6 ​ $ 89.9 ​ $ — $ 185.4 Trade receivables, net of allowance ​ 97.7 ​ 2.6 ​ 76.7 ​ — ​ 177.0 Prepaid expenses ​ 47.9 ​ 0.1 ​ 17.3 ​ — ​ 65.3 Other current assets ​ 131.4 ​ — ​ (74.6) ​ — ​ 56.8 Total current assets ​ 362.9 ​ 12.3 ​ 109.3 ​ — ​ 484.5 Property and equipment, net ​ 5,010.1 ​ — ​ 798.8 ​ — ​ 5,808.9 Intangible assets, net ​ 983.7 ​ 7.3 ​ 127.8 ​ — ​ 1,118.8 Goodwill ​ 1,520.3 ​ 14.6 ​ 171.7 ​ — ​ ​ 1,706.6 Deferred income taxes, net ​ 1.0 ​ ​ — ​ ​ 23.8 ​ ​ — ​ 24.8 Other assets ​ 152.4 ​ — ​ 37.8 ​ — ​ 190.2 Related party receivable ​ 358.9 ​ — ​ — ​ (358.9) ​ — Investment in subsidiary ​ ​ 664.1 ​ — ​ — ​ (664.1) ​ ​ — Total assets ​ $ 9,053.4 ​ $ 34.2 ​ $ 1,269.2 ​ $ (1,023.0) ​ $ 9,333.8 Liabilities and member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 53.2 ​ $ 0.5 ​ $ 20.0 ​ $ — ​ $ 73.7 Accrued liabilities ​ 243.4 ​ 1.4 ​ 70.0 ​ — ​ 314.8 Accrued interest ​ 73.1 ​ — ​ — ​ — ​ 73.1 Current portion of long-term debt ​ ​ 5.0 ​ ​ — ​ ​ — ​ ​ — ​ ​ 5.0 Finance lease obligations, current ​ ​ 8.6 ​ ​ — ​ ​ 1.4 ​ ​ — ​ ​ 10.0 Deferred revenue, current ​ 135.1 ​ 0.1 ​ 39.7 ​ — ​ 174.9 Total current liabilities ​ 518.4 ​ 2.0 ​ 131.1 ​ — ​ 651.5 Long-term debt, non-current ​ 5,839.7 ​ — ​ — ​ — ​ 5,839.7 Related party debt, long-term ​ ​ — ​ ​ — ​ ​ 358.9 ​ ​ (358.9) ​ ​ — Finance lease obligation, non-current ​ 163.4 ​ — ​ 8.8 ​ — ​ 172.2 Deferred revenue, non-current ​ 1,045.2 ​ — ​ 102.9 ​ — ​ 1,148.1 Deferred income taxes, net ​ 136.6 ​ — ​ 2.2 ​ — ​ 138.8 Other long-term liabilities ​ 21.3 ​ — ​ 33.4 ​ — ​ 54.7 Total liabilities ​ 7,724.6 ​ 2.0 ​ 637.3 ​ (358.9) ​ 8,005.0 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's equity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Member's interest ​ 1,587.4 ​ 13.5 ​ 462.6 ​ (487.3) ​ 1,576.2 Accumulated other comprehensive loss ​ (23.9) ​ — ​ (23.9) ​ 23.9 ​ (23.9) Accumulated deficit ​ (234.7) ​ 18.7 ​ 193.2 ​ (200.7) ​ (223.5) Total member's equity ​ 1,328.8 ​ 32.2 ​ 631.9 ​ (664.1) ​ 1,328.8 Total liabilities and member's equity ​ $ 9,053.4 ​ $ 34.2 ​ $ 1,269.2 ​ $ (1,023.0) ​ $ 9,333.8
Schedule of Condensed Consolidating Statements of Operations	Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Revenue ​ $ 507.0 ​ $ 5.1 ​ $ 126.5 ​ $ — ​ $ 638.6 Operating costs and expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating costs (excluding depreciation amortization and including stock-based compensation) ​ 169.9 ​ 3.4 ​ 57.7 ​ — ​ 231.0 Selling, general and administrative expenses (including stock-based compensation) ​ 95.4 ​ 0.4 ​ 26.8 ​ — ​ 122.6 Depreciation and amortization ​ 138.2 ​ 0.5 ​ 17.4 ​ — ​ 156.1 Total operating costs and expenses ​ 403.5 ​ 4.3 ​ 101.9 ​ — ​ 509.7 Operating income ​ 103.5 ​ 0.8 ​ 24.6 ​ — ​ 128.9 Other expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest expense ​ (79.1) ​ — ​ (5.6) ​ — ​ (84.7) Foreign currency loss on intercompany loans ​ (1.0) ​ — ​ (11.9) ​ — ​ (12.9) Other expense ​ 0.3 ​ — ​ 0.3 ​ — ​ 0.6 Equity in net earnings of subsidiaries ​ 8.2 ​ — ​ — ​ (8.2) ​ — Total other expense, net ​ (71.6) ​ — ​ (17.2) ​ (8.2) ​ (97.0) Income/(loss) from operations before income taxes ​ 31.9 ​ 0.8 ​ 7.4 ​ (8.2) ​ 31.9 Provision for income taxes ​ 11.8 ​ — ​ 2.2 ​ — ​ 14.0 Net income/(loss) ​ ​ 20.1 ​ ​ 0.8 ​ ​ 5.2 ​ ​ (8.2) ​ ​ 17.9 Other comprehensive (loss)/income, net of income taxes ​ ​ (14.4) ​ ​ — ​ ​ (14.4) ​ ​ 14.4 ​ ​ (14.4) Comprehensive income/(loss) ​ $ 5.7 ​ $ 0.8 ​ $ (9.2) ​ $ 6.2 ​ $ 3.5 ​ Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended September 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Eliminations ​ Total ​ ​ (in millions) Revenue ​ $ 498.6 ​ $ 5.2 ​ $ 137.3 ​ $ — ​ $ 641.1 Operating costs and expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating costs (excluding depreciation amortization and including stock-based compensation) ​ 160.7 ​ 3.7 ​ 64.0 ​ — ​ 228.4 Selling, general and administrative expenses (including stock-based compensation) ​ 91.3 ​ 0.4 ​ 30.4 ​ — ​ 122.1 Depreciation and amortization ​ 146.0 ​ 0.5 ​ 21.3 ​ — ​ 167.8 Total operating costs and expenses ​ 398.0 ​ 4.6 ​ 115.7 ​ — ​ 518.3 Operating income ​ 100.6 ​ 0.6 ​ 21.6 ​ — ​ 122.8 Other expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest expense ​ (76.5) ​ — ​ (5.7) ​ — ​ (82.2) Foreign currency loss on intercompany loans ​ (2.2) ​ — ​ (2.4) ​ — ​ (4.6) Other expense ​ 6.2 ​ — ​ 0.4 ​ — ​ 6.6 Equity in net earnings of subsidiaries ​ 9.8 ​ — ​ — ​ (9.8) ​ — Total other expense, net ​ (62.7) ​ — ​ (7.7) ​ (9.8) ​ (80.2) Income/(loss) from operations before income taxes ​ 37.9 ​ 0.6 ​ 13.9 ​ (9.8) ​ 42.6 Provision for income taxes ​ 15.8 ​ — ​ 4.7 ​ — ​ 20.5 Net income/(loss) ​ ​ 22.1 ​ ​ 0.6 ​ ​ 9.2 ​ ​ (9.8) ​ ​ 22.1 Other comprehensive income/(loss), net of income taxes ​ ​ 6.3 ​ ​ — ​ ​ 6.3 ​ ​ (6.3) ​ ​ 6.3 Comprehensive income/(loss) ​ $ 28.4 ​ $ 0.6 ​ $ 15.5 ​ $ (16.1) ​ $ 28.4
Schedule of Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows For the Three Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Total ​ ​ (in millions) Net cash provided by operating activities ​ $ 277.2 $ 1.4 $ 33.2 ​ $ 311.8 Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases of property and equipment ​ (184.3) ​ — ​ (32.8) ​ (217.1) Net cash used in investing activities ​ (184.3) ​ — ​ (32.8) ​ ​ (217.1) Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Principal payments on long-term debt ​ ​ (21.3) ​ ​ — ​ ​ — ​ ​ (21.3) Principal repayments on finance lease obligations ​ ​ (2.0) ​ ​ — ​ ​ (0.1) ​ ​ (2.1) Contributions to parent ​ ​ (9.5) ​ ​ (3.6) ​ ​ 13.1 ​ ​ — Net cash (used in)/ provided by financing activities ​ (32.8) ​ (3.6) ​ 13.0 ​ (23.4) Effect of changes in foreign exchange rates on cash ​ — ​ — ​ (2.7) ​ (2.7) Net increase/(decrease) in cash, cash equivalents and restricted cash ​ 60.1 ​ (2.2) ​ 10.7 ​ 68.6 Cash, cash equivalents and restricted cash, beginning of year ​ 86.3 ​ 9.6 ​ 90.7 ​ 186.6 Cash, cash equivalents and restricted cash, end of period ​ $ 146.4 ​ $ 7.4 ​ $ 101.4 ​ $ 255.2 ​ Condensed Consolidating Statements of Cash Flows For the Three Months Ended September 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Zayo Group, ​ ​ ​ ​ ​ ​ ​ ​ LLC ​ Guarantor ​ Non-Guarantor ​ ​ ​ ​ ​ (Issuer) ​ Subsidiaries ​ Subsidiaries ​ Total ​ ​ (in millions) Net cash provided by operating activities ​ $ 212.0 $ 3.1 $ 26.7 ​ $ 241.8 Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases of property and equipment ​ (150.5) ​ — ​ (32.0) ​ (182.5) Proceeds from sale of SRT, net of cash held in escrow ​ ​ 39.0 ​ — ​ — ​ 39.0 Net cash used in investing activities ​ (111.5) ​ — ​ (32.0) ​ ​ (143.5) Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Principal payments on long-term debt ​ ​ (1.3) ​ ​ — ​ ​ — ​ ​ (1.3) Principal repayments on finance lease obligations ​ ​ (1.6) ​ ​ — ​ ​ (0.3) ​ ​ (1.9) Payments to repurchase ZGH common stock ​ ​ (0.2) ​ ​ — ​ ​ — ​ ​ (0.2) Contributions to parent ​ ​ (8.7) ​ ​ (1.6) ​ ​ 10.3 ​ ​ — Cash paid for Santa Clara acquisition ​ ​ (3.3) ​ ​ — ​ ​ — ​ ​ (3.3) Net cash (used in)/provided by financing activities ​ (15.1) ​ (1.6) ​ 10.0 ​ (6.7) Effect of changes in foreign exchange rates on cash ​ — ​ — ​ 2.2 ​ 2.2 Net increase in cash, cash equivalents and restricted cash ​ 85.4 ​ 1.5 ​ 6.9 ​ 93.8 Cash, cash equivalents and restricted cash, beginning of year ​ 142.7 ​ 5.9 ​ 112.0 ​ 260.6 Cash, cash equivalents and restricted cash, end of period ​ $ 228.1 ​ $ 7.4 ​ $ 118.9 ​ $ 354.4

BUSINESS AND BASIS OF PRESENT_3

BUSINESS AND BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2019USD ($)segment	Sep. 30, 2018USD ($)	May 08, 2019$ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of segments | segment	4
Acquisition related costs | $	$ 2	$ 0.7
Merger Agreement [Member] | Selling, general and administrative expenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquisition related costs | $	$ 2
Merger Agreement [Member] | Consortium of Private Equity Funds [Member] | Front Range TopCo, Inc. and Front Range BidCo, Inc. [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Par value (per share) | $ / shares			$ 0.001
Consideration in cash (per share) | $ / shares			$ 35

BUSINESS AND BASIS OF PRESENT_4

BUSINESS AND BASIS OF PRESENTATION - Recently Adopted Accounting Policy (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jul. 01, 2019
Recently Issued Accounting Pronouncements
ROU assets	$ 653
Lease liabilities	$ 700.1
ASC 842
Recently Issued Accounting Pronouncements
ROU assets		$ 527.6
Lease liabilities		$ 545.1

ACQUISITIONS AND DISPOSITIONS (

ACQUISITIONS AND DISPOSITIONS (Narrative) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2019USD ($)item	Sep. 30, 2018USD ($)
Business Acquisition [Line Items]
Number of business combinations completed | item	45
Acquisition related costs	$ 2	$ 0.7
Merger Agreement [Member] | Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition related costs	$ 2

ACQUISITIONS AND DISPOSITIONS_2

ACQUISITIONS AND DISPOSITIONS (Scott-Rice Telephone Co.) (Details) - Scott-Rice Telephone Co. - USD ($) $ in Millions	Jul. 31, 2018	Sep. 30, 2019	Jun. 30, 2017	Jun. 30, 2018
Dispositions
Consideration received for disposal	$ 42.2
Purchase price held in escrow		$ 3.2
Pre-tax gain on sale	$ 5.5
Pre-tax income (loss)			$ 2.9	$ (1.6)

GOODWILL (Schedule of Goodwill)

GOODWILL (Schedule of Goodwill) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2019USD ($)
Goodwill [Line Items]
Goodwill, beginning balance	$ 1,706.6
Foreign Currency Translation and Other	(5.5)
Goodwill, ending balance	1,701.1
Fiber Solutions [Member]
Goodwill [Line Items]
Goodwill, beginning balance	1,000.9
Foreign Currency Translation and Other	(3.2)
Goodwill, ending balance	997.7
Layer 2/3 [Member]
Goodwill [Line Items]
Goodwill, beginning balance	200.8
Foreign Currency Translation and Other	(0.7)
Goodwill, ending balance	200.1
Transport [Member]
Goodwill [Line Items]
Goodwill, beginning balance	176.2
Foreign Currency Translation and Other	(0.6)
Goodwill, ending balance	175.6
zColo [Member]
Goodwill [Line Items]
Goodwill, beginning balance	259.6
Foreign Currency Translation and Other	(1)
Goodwill, ending balance	258.6
CloudLink [Member]
Goodwill [Line Items]
Goodwill, beginning balance	14.7
Goodwill, ending balance	14.7
Allstream [Member]
Goodwill [Line Items]
Goodwill, beginning balance	39
Goodwill, ending balance	39
Other [Member]
Goodwill [Line Items]
Goodwill, beginning balance	15.4
Goodwill, ending balance	$ 15.4

INTANGIBLE ASSETS (Schedule of

INTANGIBLE ASSETS (Schedule of Identifiable Acquisition Related Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	$ 1,554	$ 1,601
Accumulated Amortization	(478.7)	(500.2)
Total Net	1,075.3	1,100.8
Intangible Assets, Gross (Excluding Goodwill)	1,571.5	1,619
Intangible Assets, Net	1,092.8	1,118.8
Certifications [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-Lived Intangible Assets	3.5	3.5
Indefinite-Lived Underlying Rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-Lived Intangible Assets	14	14.5
Customer Relationships [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	1,550.6	1,597.6
Accumulated Amortization	(477)	(498.7)
Total Net	1,073.6	1,098.9
Finite-Lived Underlying Rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	3.4	3.4
Accumulated Amortization	(1.7)	(1.5)
Total Net	$ 1.7	$ 1.9

LONG-TERM DEBT (Summary of Long

LONG-TERM DEBT (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Jul. 05, 2017	Apr. 10, 2017	Jan. 19, 2017
Debt Instrument [Line Items]
Debt obligations	$ 5,861.8	$ 5,883
Unamortized premium, net	11.9	11.9
Unamortized debt issuance costs	(47.6)	(50.2)
Carrying value of debt	5,826.1	5,844.7
Less current portion	(130)	(5)
Long-term debt, less current portion	5,696.1	5,839.7
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt obligations	125	145
Carrying value of debt	125	145
6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt obligations	1,430
6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt obligations	900
5.75% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Debt obligations	1,650
Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt obligations					$ 2,500
Carrying value of debt	1,748.3	1,748.8
Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Debt obligations	487.5	488.7
Term Loan Facility B-2 [Member]
Debt Instrument [Line Items]
Debt obligations	1,269.3	1,269.3
Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt obligations	$ 1,430	1,430
Interest rate of debt redeemed	6.00%
Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt obligations	$ 900	900
Interest rate of debt redeemed	6.375%
Unsecured Debt [Member] | 5.75% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Debt obligations	$ 1,650	$ 1,650	$ 300	$ 550
Interest rate of debt redeemed	5.75%		5.75%	5.75%

LONG-TERM DEBT (Narrative) (Det

LONG-TERM DEBT (Narrative) (Details) - USD ($) $ in Millions

Feb. 26, 2018

Dec. 22, 2017

Jul. 20, 2017

Jul. 05, 2017

Apr. 10, 2017

Jan. 19, 2017

Apr. 14, 2016

May 06, 2015

Jul. 31, 2017

Sep. 30, 2019

Sep. 30, 2018

Jun. 30, 2019

Apr. 03, 2019

Jan. 27, 2017

Mar. 09, 2015

Jan. 23, 2015

Debt Instrument [Line Items]

Line of credit facility maximum borrowing capacity

$ 8.6

Debt obligations

5,861.8

$ 5,883

Repayment of debt

$ 21.3

$ 1.3

Secured debt ratio

4.50

Debt Issuance Costs, Net

$ 47.6

50.2

Debt issuance cost

114.8

Unamortized debt issuance cost due to previous indebtedness

47.6

50.2

Accumulated amortization of debt issuance costs

67.3

64.6

Interest expense associated with the amortization of debt issuance costs

$ 2.7

2.5

Maximum

Debt Instrument [Line Items]

Total indebtedness ratio

6

Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Percentage fee on undrawn amount

0.25%

Debt obligations

$ 125

$ 145

Outstanding letters of credit increased

$ 50

Remaining borrowing capacity

$ 316.4

Percentage of excess revolver committed to debt payments

35.00%

Secured debt ratio

5.25

Effective Interest rates (in percent)

3.80%

4.20%

Revolving Credit Facility [Member] | Minimum

Debt Instrument [Line Items]

Percentage fee on unused capacity

0.25%

Revolving Credit Facility [Member] | Maximum

Debt Instrument [Line Items]

Percentage fee on unused capacity

0.375%

Letters of Credit [Member]

Debt Instrument [Line Items]

Outstanding letters of credit

$ 8.6

Letters of Credit [Member] | Minimum

Debt Instrument [Line Items]

Percentage fee on outstanding amounts

1.00%

Letters of Credit [Member] | Maximum

Debt Instrument [Line Items]

Percentage fee on outstanding amounts

1.75%

Tranche One [Member]

Debt Instrument [Line Items]

Debt obligations

$ 500

Tranche Two (B-2 Term Loan) [Member]

Debt Instrument [Line Items]

Proceeds from issuance of private placement

$ 310.7

$ 310.7

6.00% Senior Notes due 2023 [Member]

Debt Instrument [Line Items]

Debt obligations

$ 1,430

6.375% Senior Notes due 2025 [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

6.375%

Debt obligations

$ 900

5.75% Senior Notes due 2027 [Member]

Debt Instrument [Line Items]

Debt obligations

1,650

Secured Debt [Member] | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Line of credit facility maximum borrowing capacity

$ 450

Proceeds from revolving credit facility

0

$ 0

Outstanding letters of credit

$ 125

Secured Debt [Member] | Letters of Credit [Member]

Debt Instrument [Line Items]

Quarterly principal payments per quarter, in basis points

0.25%

Secured Debt [Member] | Letters of Credit [Member] | Maximum

Debt Instrument [Line Items]

Percentage of excess cash flows committed to debt payments

50.00%

Term Loan Facility [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

(1.00%)

Weighted average interest rate

4.20%

4.60%

Aggregate principal amount outstanding

$ 1,756.8

Debt obligations

$ 2,500

Repriced percentage

99.75%

Repayment of debt

$ 570.1

$ 196

Term Loan Facility [Member] | LIBOR [Member] | Minimum

Debt Instrument [Line Items]

Spread on interest rate

1.00%

Term Loan Facility [Member] | LIBOR [Member] | Maximum

Debt Instrument [Line Items]

Fee on outstanding letters of credit based upon leverage ratio

1.75%

Incremental Term Loan [Member]

Debt Instrument [Line Items]

Debt obligations

$ 1,850

Repriced percentage

99.75%

Incremental Term Loan [Member] | Electric Lightwave [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

(0.25%)

Maturity period from incurrence

7 years

Debt obligations

$ 650

Incremental Term Loan [Member] | LIBOR [Member] | Electric Lightwave [Member]

Debt Instrument [Line Items]

Spread on interest rate

2.25%

2.50%

Incremental Term Loan [Member] | LIBOR [Member] | Minimum | Electric Lightwave [Member]

Debt Instrument [Line Items]

Spread on interest rate

1.00%

1.00%

Incremental Term Loan [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

(0.75%)

Maturity period from incurrence

4 years

Debt obligations

$ 150

$ 500

Incremental Term Loan [Member] | Tranche One [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Spread on interest rate

2.25%

2.00%

Incremental Term Loan [Member] | Tranche One [Member] | LIBOR [Member] | Minimum

Debt Instrument [Line Items]

Spread on interest rate

1.00%

0.00%

Incremental Term Loan [Member] | Tranche Two (B-2 Term Loan) [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

(0.25%)

Maturity period from incurrence

7 years

Debt obligations

$ 1,350

Incremental Term Loan [Member] | Tranche Two (B-2 Term Loan) [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Spread on interest rate

2.50%

Incremental Term Loan [Member] | Tranche Two (B-2 Term Loan) [Member] | LIBOR [Member] | Minimum

Debt Instrument [Line Items]

Spread on interest rate

1.00%

Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]

Debt Instrument [Line Items]

Repayment of debt

325.6

Redemption premium and accrued interest included in redemption amount

$ 20.3

Interest rate of debt redeemed

10.125%

Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

6.00%

Debt obligations

$ 1,430

$ 1,430

Interest rate of debt redeemed

6.00%

Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member] | Zayo Group Ltd (ZGL) [Member]

Debt Instrument [Line Items]

Debt obligations

$ 700

Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member] | Zayo Capital [Member]

Debt Instrument [Line Items]

Debt obligations

$ 730

Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member]

Debt Instrument [Line Items]

Debt obligations

$ 900

900

Interest rate of debt redeemed

6.375%

Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member] | Zayo Group Ltd And Zayo Capital [Member]

Debt Instrument [Line Items]

Debt obligations

$ 550

$ 350

Debt price percentage

97.76%

Unsecured Debt [Member] | 5.75% Senior Notes due 2027 [Member]

Debt Instrument [Line Items]

Debt obligations

$ 300

$ 550

$ 1,650

$ 1,650

Debt price percentage

104.25%

104.00%

Interest rate of debt redeemed

5.75%

5.75%

5.75%

Unsecured Debt [Member] | 5.75% Senior Notes due 2027 [Member] | Zayo Group Ltd And Zayo Capital [Member]

Debt Instrument [Line Items]

Debt obligations

$ 800

Interest rate of debt redeemed

5.75%

INCOME TAXES (Reconciliation of

INCOME TAXES (Reconciliation of Income Tax Provision) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
INCOME TAXES
Expected provision at the statutory rate	$ 6.7	$ 8.9
Stock-based compensation	0.7	1.1
State income taxes expense, net of federal benefit	1.9	1.5
Change in statutory tax rate, outside U.S.		(0.1)
Change in uncertain tax benefits	1
Foreign tax rate differential	1.2	0.2
State NOL expirations	1.6
U.S. Tax Reform		7.6
Change in valuation allowance		(0.3)
Other, net	0.9	1.6
Provision for income taxes	$ 14	$ 20.5

INCOME TAXES (Narrative) (Detai

INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	Dec. 22, 2017	Sep. 30, 2019	Jun. 30, 2019
INCOME TAXES
Effective tax rates	35.00%	21.00%
Gross unrecognized tax benefits		$ 16.4	$ 15.7
Accrued interest and penalties		$ 2.5	$ 2.2

EQUITY (Details)

EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		5 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Nov. 07, 2018	May 07, 2018
Shares repurchased during the period		6,229
Share Price		$ 34
Stock repurchase program, value repurchased		$ 0.2
Increase in additional paid-in capital associated with stock-based compensation expense	$ 26.3	$ 26.3
Share Repurchase Program Authorized May 07, 2018 [Member]
Share repurchase program authorized amount				$ 500
Stock repurchase program, value repurchased			$ 496

STOCK-BASED COMPENSATION (Summa

STOCK-BASED COMPENSATION (Summary of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 27.2	$ 26.7
Operating costs
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	3.2	2.7
Selling, general and administrative expenses
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	24	24
Part A restricted stock units
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	22.7	23.3
Part B restricted stock units
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	3.8	2.9
Part C restricted stock units
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 0.7	$ 0.5

STOCK-BASED COMPENSATION (Narra

STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ in Millions	Oct. 16, 2014	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 27.2				$ 26.7
PCIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incentive plan termination period	10 years
Part A restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 22.7				$ 23.3
Incentive plan termination period		10 days
Unrecognized compensation cost		$ 29.2
Award recorded as liability		$ 6.7	$ 6.2
Number of RSUs, Granted		640,191
Vesting period		12 months				15 months
Part B restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 3.8				$ 2.9
Unrecognized compensation cost		$ 8.8
Number of RSUs, Granted		64,705	75,370	98,342	61,123	58,418
Vesting period		12 months				15 months
Shares authorized		446,465	520,053	678,560	421,749	403,084
Part C restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 0.7				$ 0.5
Number of RSUs, Granted		19,347				14,137
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Average closing price		10 days
Performance period		1 year

STOCK-BASED COMPENSATION (Sum_2

STOCK-BASED COMPENSATION (Summary of Restricted Stock Units Activity) (Details) - $ / shares	3 Months Ended					12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2019
Part A restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Outstanding beginning balance	2,324,396
Number of RSUs, Granted	640,191
Number of RSUs, Vested	(552,064)
Number of RSUs, Forfeited	(74,448)
Number of RSUs, Outstanding ending balance	2,338,075	2,324,396				2,324,396
Weighted average grant-date fair value per share, Outstanding beginning balance	$ 28.49
Weighted average grant-date fair value per share, Granted	33.73
Weighted average grant-date fair value per share, Vested	25.93
Weighted average grant-date fair value per share, Outstanding ending balance	$ 30.39	$ 28.49				$ 28.49
Weighted average remaining contractual term in months	5 years 9 months 18 days					6 years 7 months 6 days
Part B restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Outstanding beginning balance	289,254
Number of RSUs, Granted	64,705	75,370	98,342	61,123	58,418
Number of RSUs, Vested	(57,336)
Number of RSUs, Outstanding ending balance	296,623	289,254				289,254
Weighted average grant-date fair value per share, Outstanding beginning balance	$ 49.73
Weighted average grant-date fair value per share, Granted	69.86	$ 63.67	$ 52.81	$ 22.43	$ 64.41
Weighted average grant-date fair value per share, Vested	64.41
Weighted average grant-date fair value per share, Outstanding ending balance	$ 51.28	$ 49.73				$ 49.73
Weighted average remaining contractual term in months	7 years 6 months					8 years

STOCK-BASED COMPENSATION (Sum_3

STOCK-BASED COMPENSATION (Summary of Part B RSUs Granted and Units Converted to Common Stock) (Details) - Part B restricted stock units - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Part B RSUs granted	64,705	75,370	98,342	61,123	58,418
Maximum eligible shares of ZGH's common stock	446,465	520,053	678,560	421,749	403,084
Average grant date fair value per Part B RSU	$ 69.86	$ 63.67	$ 52.81	$ 22.43	$ 64.41

EMPLOYEE BENEFITS (Components o

EMPLOYEE BENEFITS (Components of Net Periodic (Benefit) Cost) (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 0.6	$ 0.8
Interest cost		0.9	0.9
Expected return on plan assets		(1.3)	(1.4)
Amortization of service cost from earlier periods		0.2	0.2
Gain on curtailment	[1]		(0.4)
Net periodic pension benefit cost		0.4	0.1
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost		0.1	0.1
Net periodic pension benefit cost		$ 0.1	$ 0.1
[1]	During the three months ended September 30, 2018, the Company approved an amendment to the defined benefit pension plan freezing benefit accruals for certain members of the pension plan as of September 30, 2018. The plan freeze had an immaterial impact to the financial statements for the period ended September 30, 2018.

FAIR VALUE MEASUREMENTS (Narrat

FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions	Dec. 22, 2017	Sep. 30, 2019	Jun. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		$ 5,826.1	$ 5,844.7
Hypothetical interest rate increase		1.00%
Hypothetical annual interest expense		$ 18.8
Revolving Credit Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		125	145
Term Loan Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		$ 1,748.3	1,748.8
Term Loan Facility [Member] | LIBOR [Member] | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Spread on interest rate	1.00%
Floor rate		1.00%
Tranche One [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, face amount		$ 500
Tranche One [Member] | LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Spread on interest rate		2.00%
Floor rate		0.00%
Tranche Two (B-2 Term Loan) [Member] | LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Spread on interest rate		2.25%
Floor rate		1.00%
Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes		$ 4,000.4	4,001.1
Fair value of the notes		4,069.1	4,067.7
Notes [Member] | Term Loan Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of the notes		$ 1,762.8	$ 1,758

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Narrative) (Details) $ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019CAD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2019CAD ($)	Sep. 30, 2019CAD ($)
Commitment And Contingencies [Line Items]
Purchase commitments	$ 586.7
Line Of Credit Facility Maximum Borrowing Capacity	8.6
Commitment for telecom services 2 year period [Member]
Commitment And Contingencies [Line Items]
Other commitments	62.7	$ 83	$ 95.9	$ 127
Other commitments period			2 years	2 years
Commitment for telecom services 3 year period [Member]
Commitment And Contingencies [Line Items]
Other commitments	16.8	$ 22.2	$ 30.2	$ 40
Other commitments period			3 years	3 years
Credit Letter Agreement [Member]
Commitment And Contingencies [Line Items]
Line Of Credit Facility Maximum Borrowing Capacity	3.8				$ 5
Outstanding letters of credit	$ 2.1				$ 2.8

REVENUE AND CONTRACT COSTS (Det

REVENUE AND CONTRACT COSTS (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
REVENUE AND CONTRACT COSTS
Revenue from Contracts with Customers - ASC 606	$ 346.9	$ 380.9
Lease Revenue - ASC 842 (1)	291.7	260.2
Revenues, Total	$ 638.6	$ 641.1

REVENUE AND CONTRACT COSTS - (R

REVENUE AND CONTRACT COSTS - (Remaining Performance Obligation) (Details) $ in Billions	Sep. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 1.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage	49.30%
Revenue recognition satisfaction period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage	31.20%
Revenue recognition satisfaction period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage	13.20%
Revenue recognition satisfaction period	12 months

REVENUE AND CONTRACT COSTS - (S

REVENUE AND CONTRACT COSTS - (Summary of Customer Receivables, Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
REVENUE AND CONTRACT COSTS
Customer receivable, net	$ 86.6		$ 136.4
Contract liabilities	47.1		$ 50.5
Contract with customer liability, revenue recognized	$ 4.8	$ 5.4

REVENUE AND CONTRACT COSTS - (C

REVENUE AND CONTRACT COSTS - (Contract Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Minimum
Contract Costs
Amortization period	1 year
Maximum
Contract Costs
Amortization period	18 years
Selling, general and administrative expenses
Contract Costs
Amortization of deferred contract costs	$ 1.7	$ 2.1
Other current assets
Contract Costs
Short-term unamortized contract costs	5.6		$ 5.7
Other assets
Contract Costs
Long term unamortized contract costs	$ 4.5		$ 3.8

LEASES (Narrative) (Details)

LEASES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Jul. 01, 2019
LEASES
Package of practical expedients	true
ROU assets	$ 653
Lease liabilities	$ 700.1
ASC 842
LEASES
ROU assets		$ 527.6
Lease liabilities		$ 545.1

LEASES - Lease Expense (Details

LEASES - Lease Expense (Details) $ in Millions	3 Months Ended
	Sep. 30, 2019USD ($)
Lease expense
Operating and short-term lease cost	$ 57.9
Finance lease cost:
Amortization of right-of-use assets	3.5
Interest on lease liability	2.9
Total finance lease cost	6.4
Total lease cost	$ 64.3

LEASES - Supplemental Unaudited

LEASES - Supplemental Unaudited Condensed Consolidated Balance Sheet Information related to leases (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Assets
Right-of-use operating lease assets	$ 499.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseRightOfUseAsset
Finance lease assets	$ 153.8
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Total leased assets	$ 653
Current liabilities
Operating lease obligations, current	$ 127.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityCurrent
Finance lease obligations, current	$ 9.5	$ 10
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:FinanceLeaseLiabilityCurrent
Noncurrent
Operating lease liabilities, non-current	$ 387.4
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating lease liabilities, non-current
Finance lease obligation, non-current	$ 176	$ 172.2
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Finance lease obligation, non-current
Total lease liabilities	$ 700.1
Operating leases	7 years 1 month 6 days
Finance leases	11 years 10 months 24 days
Operating leases	3.95%
Finance leases	5.78%

LEASES - Supplemental Unaudit_2

LEASES - Supplemental Unaudited condensed consolidated cash flow statement information related to leases (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
LEASES
Operating cash flows from operating leases	$ 37.2
Operating cash flows from finance leases	2.9
Finance cash flows from finance leases	2.1	$ 1.9
Total lease cost	$ 42.2

LEASES - Maturities of Lease Li

LEASES - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020 (remaining nine months)	$ 95.5	$ 128.1
2021	111.7	107
2022	84.2	83.7
2023	67.2	68
2024	53.8	55.7
Thereafter	193.1	215.8
Total lease payments	605.5	658.3
Less: Interest	(90.9)
Total lease liabilities	514.6
Less: current portion	(127.2)
Long-term portion	387.4
Finance Lease, Liability, Payment, Due [Abstract]
2020 (remaining nine months)	15.4	20.1
2021	20.1	20
2022	20.3	20.3
2023	20.1	19.9
2024	19.3	19.5
Thereafter	180.3	171
Total lease payments	275.5	270.8
Less: Interest	(90)	(88.6)
Total lease liabilities	185.5
Less: current portion	(9.5)	(10)
Long-term portion	176	$ 172.2
Lessor, operating lease not yet commenced	$ 0

LEASES - Maturities of Non-Canc

LEASES - Maturities of Non-Cancellable leases (Details) $ in Millions	Sep. 30, 2019USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2020 (remaining nine months)	$ 719.3
2021	728.7
2022	598.6
2023	496.4
2024	432.5
Thereafter	399.3
Total lease payments	$ 3,374.8

RELATED PARTY TRANSACTIONS (Nar

RELATED PARTY TRANSACTIONS (Narrative) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2019USD ($)
Dan Caruso [Member] | Aircraft Reimbursement [Member]
Related Party Transaction [Line Items]
Payable to related party settled	$ 0.1

SEGMENT REPORTING (Narrative) (

SEGMENT REPORTING (Narrative) (Details)	Sep. 30, 2019
Fiber Solutions [Member] | Minimum
Segment Reporting Information [Line Items]
Contract term	3 years
Fiber Solutions [Member] | Maximum
Segment Reporting Information [Line Items]
Contract term	20 years
Layer 2/3 [Member] | Minimum
Segment Reporting Information [Line Items]
Contract term	1 year
Layer 2/3 [Member] | Maximum
Segment Reporting Information [Line Items]
Contract term	5 years
Transport [Member] | Minimum
Segment Reporting Information [Line Items]
Contract term	2 years
Transport [Member] | Maximum
Segment Reporting Information [Line Items]
Contract term	5 years
zColo [Member] | Minimum
Segment Reporting Information [Line Items]
Contract term	2 years
zColo [Member] | Maximum
Segment Reporting Information [Line Items]
Contract term	5 years
Other [Member]
Segment Reporting Information [Line Items]
Contract term	1 year

SEGMENT REPORTING (Summary of F

SEGMENT REPORTING (Summary of Financial Information by Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue from external customers	$ 638.6	$ 641.1
Segment Adjusted EBITDA	314.8	319.4
Total assets	9,881.1		$ 9,333.8
Capital expenditures	217.1	182.5
Corp/Eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	154.8		92.1
Fiber Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	483.2	461.6
Segment Adjusted EBITDA	277.5	266.2
Total assets	7,992.4		7,677.4
Capital expenditures	194.8	149.2
zColo [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	63.7	69.3
Segment Adjusted EBITDA	26.6	31.3
Total assets	1,312.2		1,152.3
Capital expenditures	18.1	28.7
Allstream [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	86.6	105
Segment Adjusted EBITDA	9.3	20.8
Total assets	388.6		376.9
Capital expenditures	4.2	4.6
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	5.1	5.2
Segment Adjusted EBITDA	1.4	$ 1.1
Total assets	$ 33.1		$ 35.1

SEGMENT REPORTING (Reconciliati

SEGMENT REPORTING (Reconciliation from Total Segment Adjusted EBITDA to Income from Operations Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
SEGMENT REPORTING
Total Segment Adjusted EBITDA	$ 314.8	$ 319.4
Interest expense	(84.7)	(82.2)
Depreciation and amortization expense	(156.1)	(167.8)
Transaction costs	(2)	(0.7)
Stock-based compensation	(27.2)	(26.7)
Foreign currency loss on intercompany loans	(12.9)	(4.6)
Gain on business disposition		5.5
Non-cash loss on investments		(0.3)
Income from operations before income taxes	$ 31.9	$ 42.6

CONDENSED CONSOLIDATING FINAN_3

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Jul. 05, 2017	Apr. 10, 2017
Condensed Financial Statements Captions [Line Items]
Debt obligations	$ 5,861.8	$ 5,883
6.00% Senior Notes due 2023 [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	1,430
6.00% Senior Notes due 2023 [Member] | Unsecured Debt [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	1,430	1,430
6.375% Senior Notes due 2025 [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	900
6.375% Senior Notes due 2025 [Member] | Unsecured Debt [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	900	900
5.75% Senior Notes due 2027 [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	1,650
5.75% Senior Notes due 2027 [Member] | Unsecured Debt [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	$ 1,650	$ 1,650	$ 300	$ 550

CONDENSED CONSOLIDATING FINAN_4

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Schedule of Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Current assets
Cash and cash equivalents	$ 253.9	$ 185.4	$ 353.2	$ 256
Trade receivables, net of allowance	151.9	177
Prepaid expenses	68.1	65.3
Other current assets	57	56.8
Total current assets	530.9	484.5
Property and equipment, net	5,851.8	5,808.9
Intangible assets, net	1,092.8	1,118.8
Goodwill	1,701.1	1,706.6
Right-of-use operating lease assets	499.2
Deferred income taxes, net	21.3	24.8
Other assets	184	190.2
Total assets	9,881.1	9,333.8
Current liabilities
Accounts payable	31.9	73.7
Accrued liabilities	323.6	314.8
Accrued interest	84.9	73.1
Current portion of long-term debt	130	5
Operating lease obligations, current	127.2
Finance lease obligations, current	9.5	10
Deferred revenue, current	172.9	174.9
Total current liabilities	880	651.5
Long-term debt, non-current	5,696.1	5,839.7
Operating lease liabilities, non-current	387.4
Finance lease obligation, non-current	176	172.2
Deferred revenue, non-current	1,205.4	1,148.1
Deferred income taxes, net	147.5	138.8
Other long-term liabilities	30.1	54.7
Total liabilities	8,522.5	8,005
Member's equity
Member's interest	1,602.5	1,576.2
Accumulated other comprehensive loss	(38.3)	(23.9)
Accumulated deficit	(205.6)	(223.5)
Total member's equity	1,358.6	1,328.8	$ 1,542.1	$ 1,487.6
Total liabilities and member's equity	9,881.1	9,333.8
Eliminations [Member]
Current assets
Related party receivable		(358.9)
Investment in subsidiary	(635.2)	(664.1)
Total assets	(635.2)	(1,023)
Current liabilities
Related party debt, long-term		(358.9)
Total liabilities		(358.9)
Member's equity
Member's interest	(464.6)	(487.3)
Accumulated other comprehensive loss	38.3	23.9
Accumulated deficit	(208.9)	(200.7)
Total member's equity	(635.2)	(664.1)
Total liabilities and member's equity	(635.2)	(1,023)
Zayo Group, LLC [Member]
Current assets
Cash and cash equivalents	145.1	85.9
Trade receivables, net of allowance	92.5	97.7
Prepaid expenses	55.1	47.9
Other current assets	129.8	131.4
Total current assets	422.5	362.9
Property and equipment, net	5,055.9	5,010.1
Intangible assets, net	963.3	983.7
Goodwill	1,520.4	1,520.3
Right-of-use operating lease assets	328.7
Deferred income taxes, net		1
Other assets	149.3	152.4
Related party receivable		358.9
Investment in subsidiary	635.2	664.1
Total assets	9,075.3	9,053.4
Current liabilities
Accounts payable	15.7	53.2
Accrued liabilities	260.3	243.4
Accrued interest	84.9	73.1
Current portion of long-term debt	130	5
Operating lease obligations, current	95.7
Finance lease obligations, current	8.3	8.6
Deferred revenue, current	135	135.1
Total current liabilities	729.9	518.4
Long-term debt, non-current	5,318.4	5,839.7
Operating lease liabilities, non-current	252.1
Finance lease obligation, non-current	167.5	163.4
Deferred revenue, non-current	1,104	1,045.2
Deferred income taxes, net	144.1	136.6
Other long-term liabilities	0.7	21.3
Total liabilities	7,716.7	7,724.6
Member's equity
Member's interest	1,611.5	1,587.4
Accumulated other comprehensive loss	(38.3)	(23.9)
Accumulated deficit	(214.6)	(234.7)
Total member's equity	1,358.6	1,328.8
Total liabilities and member's equity	9,075.3	9,053.4
Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	7.4	9.6
Trade receivables, net of allowance	1.4	2.6
Prepaid expenses	0.2	0.1
Total current assets	9	12.3
Intangible assets, net	6.9	7.3
Goodwill	14.6	14.6
Right-of-use operating lease assets	1.9
Total assets	32.4	34.2
Current liabilities
Accounts payable	0.1	0.5
Accrued liabilities	0.8	1.4
Operating lease obligations, current	1.8
Deferred revenue, current	0.1	0.1
Total current liabilities	2.8	2
Total liabilities	2.8	2
Member's equity
Member's interest	10.1	13.5
Accumulated deficit	19.5	18.7
Total member's equity	29.6	32.2
Total liabilities and member's equity	32.4	34.2
Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	101.4	89.9
Trade receivables, net of allowance	58	76.7
Prepaid expenses	12.8	17.3
Other current assets	(72.8)	(74.6)
Total current assets	99.4	109.3
Property and equipment, net	795.9	798.8
Intangible assets, net	122.6	127.8
Goodwill	166.1	171.7
Right-of-use operating lease assets	168.6
Deferred income taxes, net	21.3	23.8
Other assets	34.7	37.8
Total assets	1,408.6	1,269.2
Current liabilities
Accounts payable	16.1	20
Accrued liabilities	62.5	70
Operating lease obligations, current	29.7
Finance lease obligations, current	1.2	1.4
Deferred revenue, current	37.8	39.7
Total current liabilities	147.3	131.1
Long-term debt, non-current	377.7
Operating lease liabilities, non-current	135.3
Finance lease obligation, non-current	8.5	8.8
Related party debt, long-term		358.9
Deferred revenue, non-current	101.4	102.9
Deferred income taxes, net	3.4	2.2
Other long-term liabilities	29.4	33.4
Total liabilities	803	637.3
Member's equity
Member's interest	445.5	462.6
Accumulated other comprehensive loss	(38.3)	(23.9)
Accumulated deficit	198.4	193.2
Total member's equity	605.6	631.9
Total liabilities and member's equity	$ 1,408.6	$ 1,269.2

CONDENSED CONSOLIDATING FINAN_5

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Schedule of Condensed Consolidating Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 638.6	$ 641.1
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation-Note 8)	231	228.4
Selling, general and administrative expenses (including stock-based compensation-Note 8)	122.6	122.1
Depreciation and amortization	156.1	167.8
Total operating costs and expenses	509.7	518.3
Operating income	128.9	122.8
Other expenses
Interest expense	(84.7)	(82.2)
Foreign currency loss on intercompany loans	(12.9)	(4.6)
Other income, net	0.6	6.6
Total other expenses, net	(97)	(80.2)
Income from operations before income taxes	31.9	42.6
Provision/(benefit) for income taxes	14	20.5
Net income	17.9	22.1
Other comprehensive income/(loss), net of income taxes	(14.4)	6.3
Comprehensive income	3.5	28.4
Eliminations [Member]
Other expenses
Equity in net earnings of subsidiaries	(8.2)	(9.8)
Total other expenses, net	(8.2)	(9.8)
Income from operations before income taxes	(8.2)	(9.8)
Net income	(8.2)	(9.8)
Other comprehensive income/(loss), net of income taxes	14.4	(6.3)
Comprehensive income	6.2	(16.1)
Zayo Group, LLC [Member]
Revenue	507	498.6
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation-Note 8)	169.9	160.7
Selling, general and administrative expenses (including stock-based compensation-Note 8)	95.4	91.3
Depreciation and amortization	138.2	146
Total operating costs and expenses	403.5	398
Operating income	103.5	100.6
Other expenses
Interest expense	(79.1)	(76.5)
Foreign currency loss on intercompany loans	(1)	(2.2)
Other income, net	0.3	6.2
Equity in net earnings of subsidiaries	8.2	9.8
Total other expenses, net	(71.6)	(62.7)
Income from operations before income taxes	31.9	37.9
Provision/(benefit) for income taxes	11.8	15.8
Net income	20.1	22.1
Other comprehensive income/(loss), net of income taxes	(14.4)	6.3
Comprehensive income	5.7	28.4
Guarantor Subsidiaries [Member]
Revenue	5.1	5.2
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation-Note 8)	3.4	3.7
Selling, general and administrative expenses (including stock-based compensation-Note 8)	0.4	0.4
Depreciation and amortization	0.5	0.5
Total operating costs and expenses	4.3	4.6
Operating income	0.8	0.6
Other expenses
Income from operations before income taxes	0.8	0.6
Net income	0.8	0.6
Comprehensive income	0.8	0.6
Non-Guarantor Subsidiaries [Member]
Revenue	126.5	137.3
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation-Note 8)	57.7	64
Selling, general and administrative expenses (including stock-based compensation-Note 8)	26.8	30.4
Depreciation and amortization	17.4	21.3
Total operating costs and expenses	101.9	115.7
Operating income	24.6	21.6
Other expenses
Interest expense	(5.6)	(5.7)
Foreign currency loss on intercompany loans	(11.9)	(2.4)
Other income, net	0.3	0.4
Total other expenses, net	(17.2)	(7.7)
Income from operations before income taxes	7.4	13.9
Provision/(benefit) for income taxes	2.2	4.7
Net income	5.2	9.2
Other comprehensive income/(loss), net of income taxes	(14.4)	6.3
Comprehensive income	$ (9.2)	$ 15.5

CONDENSED CONSOLIDATING FINAN_6

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net cash provided by operating activities	$ 311.8	$ 241.8
Cash flows from investing activities:
Purchases of property and equipment	(217.1)	(182.5)
Proceeds from sale of SRT, net of cash held in escrow		39
Net cash used in investing activities	(217.1)	(143.5)
Cash flows from financing activities:
Principal payments on long-term debt	(21.3)	(1.3)
Principal repayments on finance lease obligations	(2.1)	(1.9)
Payments to repurchase ZGH common stock		(0.2)
Cash paid for Santa Clara acquisition		(3.3)
Net cash used in financing activities	(23.4)	(6.7)
Effect of changes in foreign exchange rates on cash	(2.7)	2.2
Net increase in cash, cash equivalents and restricted cash	68.6	93.8
Cash, cash equivalents and restricted cash, beginning of period	186.6	260.6
Cash, cash equivalents and restricted cash, end of period	255.2	354.4
Zayo Group, LLC [Member]
Net cash provided by operating activities	277.2	212
Cash flows from investing activities:
Purchases of property and equipment	(184.3)	(150.5)
Proceeds from sale of SRT, net of cash held in escrow		39
Net cash used in investing activities	(184.3)	(111.5)
Cash flows from financing activities:
Principal payments on long-term debt	(21.3)	(1.3)
Principal repayments on finance lease obligations	(2)	(1.6)
Payments to repurchase ZGH common stock		(0.2)
Contributions to parent	(9.5)	(8.7)
Cash paid for Santa Clara acquisition		(3.3)
Net cash used in financing activities	(32.8)	(15.1)
Net increase in cash, cash equivalents and restricted cash	60.1	85.4
Cash, cash equivalents and restricted cash, beginning of period	86.3	142.7
Cash, cash equivalents and restricted cash, end of period	146.4	228.1
Guarantor Subsidiaries [Member]
Net cash provided by operating activities	1.4	3.1
Cash flows from financing activities:
Contributions to parent	(3.6)	(1.6)
Net cash used in financing activities	(3.6)	(1.6)
Net increase in cash, cash equivalents and restricted cash	(2.2)	1.5
Cash, cash equivalents and restricted cash, beginning of period	9.6	5.9
Cash, cash equivalents and restricted cash, end of period	7.4	7.4
Non-Guarantor Subsidiaries [Member]
Net cash provided by operating activities	33.2	26.7
Cash flows from investing activities:
Purchases of property and equipment	(32.8)	(32)
Net cash used in investing activities	(32.8)	(32)
Cash flows from financing activities:
Principal repayments on finance lease obligations	(0.1)	(0.3)
Contributions to parent	13.1	10.3
Net cash used in financing activities	13	10
Effect of changes in foreign exchange rates on cash	(2.7)	2.2
Net increase in cash, cash equivalents and restricted cash	10.7	6.9
Cash, cash equivalents and restricted cash, beginning of period	90.7	112
Cash, cash equivalents and restricted cash, end of period	$ 101.4	$ 118.9