20-F/A

As filed with the Securities and Exchange Commission on May 30, 2018

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 20-F/A

Amendment No. 1

(Mark One)

☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934

or

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2017

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from [                ] to [                ]

or

☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of event requiring this shell company report                 

For the transition period from [                ] to [                ]

Commission file number: 001-35053

InterXion Holding N.V.

(Exact name of registrant as specified in its charter)

The Netherlands

(Jurisdiction of incorporation or organization)

Scorpius 30

2132 LR Hoofddorp

The Netherlands

+31 20 880 7600

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act:

Title of Each Class	Name of Each Exchange on Which Registered
Ordinary shares, with a nominal value of €0.10 each	New York Stock Exchange

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

(Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

(Title of Class)

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report:

71,414,513 ordinary shares

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act:    Yes ☒    No ☐

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    Yes ☐    No ☒

Note—Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 from their obligations under those Sections.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes ☒    No ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes ☒    No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See definition of “large accelerated filer”, “accelerated filer” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  ☒ Accelerated filer  ☐ Non-accelerated filer  ☐ Emerging growth company  ☐

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

U.S. GAAP  ☐ International Financial Reporting Standards as issued by the International Accounting Standards Board  ☒ Other  ☐

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow:    Item 17 ☐    Item 18 ☐

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes ☐    No ☒

Explanatory Note

InterXion Holding N.V. (the “Company”) is filing this Amendment No. 1 (the “Form 20-F/A”) to its Annual Report on Form 20-F for the year ended December 31, 2017 (the “Form 20-F”), which was filed with the Securities and Exchange Commission on April 30, 2018, to submit the Interactive Data File (as defined in Rule 11 of Regulation S-T) with respect to the audited consolidated financial statements of the Company and its consolidated subsidiaries for that fiscal year as an exhibit to the Form 20-F pursuant to paragraph 101 under “Instructions as to Exhibits” of Form 20-F in accordance with Rule 405 of Regulation S-T. Exhibit 101 was omitted from the Form 20-F in accordance with the 30-day grace period provided under Rule 405(a)(2)(ii) of Regulation S-T.

Except as set forth above, this Form 20-F/A does not modify or update any of the information in the Form 20-F. This Form 20-F/A speaks as of the time of filing of the Form 20-F, does not reflect events that may have occurred subsequent to such filing, and does not modify or update in any way information made in the Form 20-F.

ITEM 19.    EXHIBITS

The following is a list of exhibits filed as part of this Amendment No.1 to the Company’s Annual Report on Form 20-F:

Exhibit number:	Description of document:
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document

* In accordance with Rule 406T(b)(2) of Regulation S-T, this eXtensible Business Reporting Language (XBRL) information is furnished and not filed or part of a registration statement or prospectus for purpose of Section 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

Signature

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this Amendment No. 1 to the Annual Report on Form 20-F on its behalf.

INTERXION HOLDING N.V.

/s/ David C. Ruberg                            

Name:    David C. Ruberg

Title:     Chief Executive Officer

Date:    May 30, 2018

XML

Document and Entity Information	12 Months Ended
	Dec. 31, 2017 shares
Document - Document and Entity Information [Abstract]
Document Type	20-F/A
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	INXN
Entity Registrant Name	InterXion Holding N.V.
Entity Central Index Key	0001500866
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	71,414,513

XML

Consolidated Income Statements - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Profit or loss [abstract]
Revenues		€ 489,302	€ 421,788		€ 386,560
Cost of sales		(190,471)	(162,568)		(151,613)
Gross profit		298,831	259,220		234,947
Other income		97	333		21,288
Sales and marketing costs		(33,465)	(29,941)		(28,217)
General and administrative costs		(167,190)	(138,557)		(134,391)
Operating income		98,273	91,055		93,627
Finance income		1,411	1,206		3,294
Finance expense		(45,778)	(37,475)		(32,316)
Profit before taxation		53,906	54,786		64,605
Income tax expense		(14,839)	(16,450)		(17,925)
Net income		€ 39,067	€ 38,336		€ 46,680
Earnings per share attributable to shareholders:
Basic earnings per share: (€)		€ 0.55	€ 0.54		€ 0.67
Diluted earnings per share: (€)	[2]	€ 0.55	€ 0.54		€ 0.66

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] The accompanying notes form an integral part of these consolidated financial statements.

XML

Consolidated Statements of Comprehensive Income - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Consolidated statements of comprehensive income [abstract]
Net income		€ 39,067	€ 38,336		€ 46,680
Items that are, or may be, reclassified subsequently to profit or loss
Foreign currency translation differences		(7,245)	(12,713)		11,633
Effective portion of changes in fair value of cash flow hedge		110	(45)		50
Tax on items that are, or may be, reclassified subsequently to profit or loss
Foreign currency translation differences		205	1,836		(1,208)
Effective portion of changes in fair value of cash flow hedge		(36)	15		(16)
Other comprehensive income/(loss), net of tax		(6,966)	(10,907)		10,459
Total comprehensive income attributable to shareholders	[2]	€ 32,101	€ 27,429		€ 57,139

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] The accompanying notes form an integral part of these consolidated financial statements.

XML

Consolidated Statements of Financial Position - EUR (€) € in Thousands		Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015
Non-current assets
Property, plant and equipment		€ 1,342,471	€ 1,156,031		€ 999,072	[1]
Intangible assets		60,593	28,694		23,194	[1]
Goodwill		38,900
Deferred tax assets		24,470	20,370		23,024	[1]
Other investments		3,693	1,942
Other non-current assets		13,674	11,914		11,152	[1]
Non-current assets		1,483,801	1,218,951		1,056,442	[1]
Current assets
Trade and other current assets		179,786	147,821		141,936	[1]
Cash and cash equivalents		38,484	115,893		53,686	[1]
Current assets		218,270	263,714		195,622	[1]
Total assets		1,702,071	1,482,665		1,252,064	[1]
Shareholders' equity
Share capital		7,141	7,060		6,992	[1]
Share premium		539,448	523,671		509,816	[1]
Foreign currency translation reserve		2,948	9,988		20,865	[1]
Hedging reserve, net of tax		(169)	(243)		(213)	[1]
Accumulated profit / (deficit)		47,360	8,293		(30,043)	[1]
Shareholders' equity		596,728	548,769		507,417	[1],[2],[3]
Non-current liabilities
Other non-current liabilities		15,080	11,718		12,049	[1]
Deferred tax liability		21,336	9,628		9,951	[1]
Borrowings		724,052	723,975		550,812	[1]
Non-current liabilities		760,468	745,321		572,812	[1]
Current liabilities
Trade payables and other liabilities		229,878	171,399		162,629	[1]
Income tax liabilities		6,237	5,694		2,738	[1]
Provision for onerous lease contracts	[1]				1,517
Borrowings		108,760	11,482		4,951	[1]
Current liabilities		344,875	188,575		171,835	[1]
Total liabilities		1,105,343	933,896		744,647	[1]
Total liabilities and shareholders' equity	[3]	€ 1,702,071	€ 1,482,665		€ 1,252,064	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] Since no minority shareholders in Group equity exist, the Group equity is entirely attributable to the parent's shareholders.

[3] The accompanying notes form an integral part of these consolidated financial statements.

XML

Consolidated Statements of Changes in Shareholders Equity - EUR (€) € in Thousands		Total		Share capital [member]	Share premium [member]	Foreign currency translation reserve [member]	Hedging Reserve [member]	Accumulated profit/(deficit) [member]
Beginning balance (Previously stated [member]) at Dec. 31, 2014		€ 436,145		€ 6,932	€ 495,109	€ 10,440	€ (247)	€ (76,089)
Beginning balance (Increase (decrease) due to corrections of prior period errors [member]) at Dec. 31, 2014					634			(634)
Beginning balance at Dec. 31, 2014		436,145		6,932	495,743	10,440	(247)	(76,723)
Net income | Previously stated [member]		48,566
Net income | Increase (decrease) due to corrections of prior period errors [member]		(1,886)
Net income		46,680	[1]					46,680
Hedging result, net of tax		34					34
Other comprehensive income/(loss), net of tax		10,425				10,425
Total comprehensive income/(loss)		57,139				10,425	34	46,680
Exercise of options		5,729		43	5,686
Issuance of performance shares				17	(17)
Share-based payments		8,404			8,404
Total contribution by, and distributions to, owners of the Company		14,133		60	14,073
Ending balance (Previously stated [member]) at Dec. 31, 2015		507,417
Ending balance at Dec. 31, 2015	[1],[2],[3]	507,417		6,992	509,816	20,865	(213)	(30,043)
Net income | Previously stated [member]		39,883
Net income | Increase (decrease) due to corrections of prior period errors [member]		(1,547)
Net income		38,336	[1]					38,336
Hedging result, net of tax		(30)					(30)
Other comprehensive income/(loss), net of tax		(10,877)				(10,877)
Total comprehensive income/(loss)		27,429				(10,877)	(30)	38,336
Exercise of options		6,332		48	6,284
Issuance of performance shares				20	(20)
Share-based payments		7,591			7,591
Total contribution by, and distributions to, owners of the Company		13,923		68	13,855
Ending balance (Previously stated [member]) at Dec. 31, 2016		548,769
Ending balance at Dec. 31, 2016	[1]	548,769		7,060	523,671	9,988	(243)	8,293
Net income		39,067						39,067
Hedging result, net of tax		74					74
Other comprehensive income/(loss), net of tax		(7,040)				(7,040)
Total comprehensive income/(loss)		32,101				(7,040)	74	39,067
Exercise of options		6,969		55	6,914
Issuance of performance shares				26	(26)
Share-based payments		8,889			8,889
Total contribution by, and distributions to, owners of the Company		15,858		81	15,777
Ending balance at Dec. 31, 2017		€ 596,728		€ 7,141	€ 539,448	€ 2,948	€ (169)	€ 47,360

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] Since no minority shareholders in Group equity exist, the Group equity is entirely attributable to the parent's shareholders.

[3] The accompanying notes form an integral part of these consolidated financial statements.

XML

Consolidated Statements of Cash Flows - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Statement of cash flows [abstract]
Net income		€ 39,067	€ 38,336	[1]	€ 46,680	[1]
Depreciation, amortization and impairments		108,252	89,835	[1]	78,229	[1]
Provision for onerous lease contracts	[1]		(1,533)		(3,532)
Share-based payments		8,889	7,652	[1]	8,404	[1]
Net finance expense		44,367	36,269	[1]	29,022	[1]
Income tax expense		14,839	16,450	[1]	17,925	[1]
Total adjustments to reconcile profit (loss)		215,414	187,009	[1]	176,728	[1]
Movements in trade receivables and other assets		(30,667)	(11,126)	[1]	(19,380)	[1]
Movements in trade payables and other liabilities		24,266	7,505	[1]	12,040	[1]
Cash generated from operations		209,013	183,388	[1]	169,388	[1]
Interest and fees paid		(41,925)	(36,003)	[1]	(30,522)	[1]
Interest received		143	136	[1]	152	[1]
Income tax paid		(11,985)	(8,124)	[1]	(11,948)	[1]
Net cash flow from operating activities		155,246	139,397	[1]	127,070	[1]
Cash flows from investing activities
Purchase of property, plant and equipment		(247,228)	(241,958)	[1]	(186,115)	[1]
Financial investments-deposits		(324)	1,139	[1]	418	[1]
Acquisition of Interxion Science Park		(77,517)
Purchase of intangible assets		(8,787)	(8,920)	[1]	(6,521)	[1]
Loans to third parties		(1,764)	(1,942)	[1]
Proceeds from sale of financial asset	[1]		281		3,063
Redemption of short-term investments	[1]				1,650
Net cash flow used in investing activities		(335,620)	(251,400)	[1]	(187,505)	[1]
Cash flows from financing activities
Proceeds from exercized options		6,969	6,332	[1]	5,686	[1]
Proceeds from mortgages		9,950	14,625	[1]	14,850	[1]
Repayment of mortgages		(10,848)	(4,031)	[1]	(2,346)	[1]
Proceeds from Revolving Facilities		129,521
Repayment of Revolving Facilities		(30,000)
Proceeds 6% Senior Secured Notes due 2020	[1]		154,808
Finance lease obligation		(995)
Interest received at issuance of Additional Notes	[1]		2,225
Net cash flows from / (used in) financing activities		104,597	173,959	[1]	18,190	[1]
Effect of exchange rate changes on cash		(1,632)	251	[1]	1,294	[1]
Net movement in cash and cash equivalents		(77,409)	62,207	[1]	(40,951)	[1]
Cash and cash equivalents, beginning of period	[1]	115,893	53,686		94,637
Cash and cash equivalents, end of period		€ 38,484	€ 115,893	[1]	€ 53,686	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Consolidated Statements of Cash Flows (Parenthetical)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of cash flows [abstract]
Percentage of interest on senior secured notes	6.00%	6.00%	6.00%
Senior secured notes due	2020	2020	2020

XML

The Company

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

The Company

1 The Company

Interxion Holding N.V. (the “Company”) is domiciled in The Netherlands. The Company’s registered office is at Scorpius 30, 2132 LR Hoofddorp, The Netherlands. The consolidated financial statements of the Company for the year ended December 31, 2017 comprise the Company and its subsidiaries (together referred to as the “Group”). The Group is a leading pan-European operator of carrier-neutral Internet data centers.

XML

Basis of preparation

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Basis of preparation

2 Basis of preparation

Statement of compliance

The consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”), effective as at December 31, 2017, as issued by the International Accounting Standards Board (“IASB”), and IFRS as adopted by the European Union.

Basis of measurement

The Group prepared its consolidated financial statements on a going-concern basis and under the historical cost convention except for certain financial instruments that have been measured at fair value.

IFRS basis of presentation

The audited consolidated financial statements as of December 31, 2017, 2016 and 2015 have been prepared in accordance with International Financial Reporting Standards (IFRS) as endorsed by the European Union (EU). All standards and interpretations issued by the International Accounting Standards Board (IASB) and the IFRS Interpretations Committee effective for the year ended 2017 have been endorsed by the EU, except that the EU did not adopt certain paragraphs of IAS 39 applicable to hedge transactions. The Group has no hedge transactions to which these paragraphs are applicable. Consequently, the accounting policies applied by the Group also comply with IFRS as issued by the IASB.

Change in accounting policies

The Group has consistently applied the accounting policies set out below to all periods presented in these consolidated financial statements. The standards below are applicable for financial statements as prepared after January 1, 2016, for IFRS as issued by the International Accounting Standards Board, and are effective for IFRS as endorsed by the EU for periods ending after January 1, 2017.

• Amendments to IAS 7 – Disclosure initiative

• Amendments to IAS 12 – Recognition of Deferred Tax Assets for Unrealized Losses

For preparation of these financial statements, the Group has concluded that these standards do not have a significant impact.

Correction of errors

Certain comparative amounts in the consolidated income statements, consolidated statements of comprehensive income, consolidated statements of financial position and consolidated statements of cash flows have been restated to correct for immaterial errors with respect to share-based payments. The impact of this restatement is disclosed in note 29 – Correction of errors. Throughout the consolidated financial statements, columns including comparative figures that have been restated, are indicated with ^‘(i)’.

Use of estimates and judgments

The preparation of financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates, which together with underlying assumptions, are reviewed on an on-going basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected.

Judgments, estimates and assumptions applied by management in preparing these financial statements are based on circumstances as at December 31, 2017, and Interxion operating as a stand-alone company.

In particular, information about significant areas of estimation uncertainty and critical judgments in applying accounting policies that have the most significant effect on amounts recognized in the financial statements are discussed below:

Property, plant and equipment and depreciation (see also Note 11) — Estimated remaining useful lives and residual values of property plant and equipment, including assets recognized upon a business combination, are reviewed annually. The carrying values of property, plant and equipment are also reviewed for impairment, where there has been a triggering event, by assessing the present value of estimated future cash flows and net realizable value compared with net book value. The calculation of estimated future cash flows and residual values is based on the Group’s best estimates of future prices, output and costs and is, therefore, subjective. In addition, the valuation of some of the assets under construction requires judgments that are related to the probability of signing lease contracts and obtaining planning permits. Regarding the properties acquired as part of the acquisition of InterXion Science Park B.V. we recognized fair value at acquisition date, based on the highest and best use.

Intangible assets and amortization (see also Note 12) — Estimated remaining useful lives of intangible assets, including those recognized upon a business combination, are reviewed annually. The carrying values of intangible assets are also reviewed for impairment where there has been a triggering event by assessing the present value of estimated future cash flows and fair value compared with net book value. The calculation of estimated future cash flows is based on the Group’s best estimates of future prices, output and costs and is, therefore, subjective. The customer portfolio acquired as part of the acquisition of InterXion Science Park B.V. was valued based on the multi-period excess earnings method, which considers the present value of net cash flows expected to be generated by the customer portfolio, excluding any cash flows related to contributory assets.

Goodwill (see also Note 12) — Goodwill is recognized as the amount by which the purchase price of an acquisition exceeds the fair values of the assets and liabilities identified as part of the purchase price allocation. Goodwill is not being amortized, but subject to an annual impairment test.

Lease accounting (see also Note 24) — At inception or modification of an arrangement, the Group determines whether such an arrangement is, or contains, a lease. Classification of a lease contract is based on the extent to which risks and rewards incidental to ownership of a leased asset lie with the lessor or the lessee. The classification of lease contracts includes the use of judgments and estimates.

Provision for onerous lease contracts (see also Note 19) — A provision is made for the discounted amount of future losses that are expected to be incurred in respect of unused data center sites over the term of the leases. Where unused sites can be sublet, or partly sublet, management has taken account of the contracted sublease income expected to be received over the minimum sublease term, which meets the Group’s revenue recognition criteria in arriving at the amount of future losses.

Costs of site restoration (see also Note 26) — Liabilities in respect of obligations to restore premises to their original condition are estimated at the commencement of the lease and reviewed annually, based on the rent period, contracted extension possibilities and possibilities of lease terminations.

Deferred tax (see also Note 10) — Provision is made for deferred tax at the rates of tax prevailing at the period-end dates unless future rates have been substantively enacted. Deferred tax assets are recognized where it is probable that they will be recovered based on estimates of future taxable profits for each tax jurisdiction. The actual profitability may be different depending on local financial performance in each tax jurisdiction.

Share-based payments (see also Note 22) — The Group issues equity-settled share-based payments to certain employees under the terms of the long-term incentive plans. The charges related to equity-settled share-based payments, options to purchase ordinary shares and restricted and performance shares, are measured at fair value at the grant date. Fair values are being redetermined for market conditions as of each reporting date, until final grant date. The fair value at the grant date of options is determined using the Black Scholes model and is expensed over the vesting period. The fair value at grant date of the performance shares is determined using the Monte Carlo model and is expensed over the vesting period. The value of the expense is dependent upon certain assumptions including the expected future volatility of the Group’s share price at the grant date and, for the performance shares, the relative performance of the Group’s share price compared with a group of peer companies.

Senior Secured Notes due 2020 (see also Note 20) — The Senior Secured Notes due 2020 are valued at amortized cost. The Senior Secured Notes due 2020 indenture includes specific early redemption clauses. As part of the initial measurement of the amortized costs value of the Senior Secured Notes due 2020 it is assumed that the Notes will be held to maturity. If an early redemption of all or part of the Notes is expected, the liability will be re-measured based on the original effective interest rate. The difference between the liability, excluding a change in assumed early redemption and the liability, including a change in assumed early redemption, will go through the profit and loss.

Functional and presentation currency

These consolidated financial statements are presented in euro, the Company’s functional and presentation currency. All information presented in euros has been rounded to the nearest thousand, except when stated otherwise.

XML

Significant accounting policies

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Significant accounting policies

3 Significant accounting policies

Basis of consolidation

The consolidated financial statements incorporate the financial statements of the Company and all entities that are directly or indirectly controlled by the Company. Subsidiaries are entities that are controlled by the Group. The Group controls an entity when it is exposed to, or has the right to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of subsidiaries are included in the consolidated financial statements from the date on which control commences until the date on which control ceases.

The accounting policies set out below have been applied consistently by all subsidiaries to all periods presented in these consolidated financial statements.

Loss of control

When the Group loses control over a subsidiary, the Company de-recognizes the assets and liabilities of the subsidiary, any non-controlling interests and the other components of equity related to the subsidiary. Any surplus or deficit arising on the loss of control is recognized in profit or loss.

Transactions eliminated on consolidation

Intercompany balances and transactions, and any unrealized income and expenses arising from intercompany transactions, are eliminated in preparing the consolidated financial statements.

Subsidiaries

With the exception of Stichting Administratiekantoor Management InterXion, all the subsidiary undertakings of the Group, as set out below are wholly owned as of December 31, 2017. Stichting Administratiekantoor is part of the consolidation based on the Group’s control over the entity.

InterXion HeadQuarters B.V., Amsterdam, The Netherlands;

InterXion Nederland B.V., Amsterdam, The Netherlands;

InterXion Trademarks B.V., Amsterdam, The Netherlands;

InterXion Participation 1 B.V., Amsterdam, The Netherlands;

InterXion Österreich GmbH, Vienna, Austria;

InterXion Real Estate VII GmbH, Vienna, Austria;

InterXion Belgium N.V., Brussels, Belgium;

InterXion Real Estate IX N.V., Brussels, Belgium;

InterXion Denmark ApS, Copenhagen, Denmark;

InterXion Real Estate VI ApS, Copenhagen, Denmark;

Interxion France SAS, Paris, France;

Interxion Real Estate II SARL, Paris, France;

Interxion Real Estate III SARL, Paris, France;

Interxion Real Estate XI SARL, Paris, France;

InterXion Deutschland GmbH, Frankfurt, Germany;

InterXion Ireland DAC, Dublin, Ireland;

Interxion Telecom SRL, Milan, Italy;

InterXion España SA, Madrid, Spain;

InterXion Sverige AB, Stockholm, Sweden;

InterXion (Schweiz) AG, Zurich, Switzerland;

InterXion Real Estate VIII AG, Zurich, Switzerland;

InterXion Carrier Hotel Ltd., London, United Kingdom;

InterXion Europe Ltd., London, United Kingdom;

InterXion Real Estate Holding B.V., Amsterdam, The Netherlands;

InterXion Real Estate I B.V., Amsterdam, The Netherlands;

InterXion Real Estate IV B.V., Amsterdam, The Netherlands;

InterXion Real Estate V B.V., Amsterdam, The Netherlands;

InterXion Real Estate X B.V., Amsterdam, The Netherlands;

InterXion Real Estate XII B.V., Amsterdam, The Netherlands;

InterXion Real Estate XIII B.V., Amsterdam, The Netherlands;

InterXion Real Estate XIV B.V., Amsterdam, The Netherlands;

InterXion Science Park B.V., Amsterdam, The Netherlands;

InterXion Operational B.V., Amsterdam, The Netherlands;

InterXion Datacenters B.V., The Hague, The Netherlands (formerly Centennium Detachering B.V.);

InterXion Consultancy Services B.V., Amsterdam, The Netherlands (dormant);

Interxion Telecom B.V., Amsterdam, The Netherlands (dormant);

Interxion Trading B.V., Amsterdam, The Netherlands (dormant);

InterXion B.V., Amsterdam, The Netherlands (dormant);

InterXion Telecom Ltd., London, United Kingdom (dormant);

Stichting Administratiekantoor Management InterXion, Amsterdam, The Netherlands.

Foreign currency

Foreign currency transactions

The individual financial statements of each Group entity are presented in the currency of the primary economic environment in which the entity operates (its functional currency). For the purpose of the consolidated financial statements, the results and the financial position of each entity are expressed in euros, which is the functional currency of the Company and the presentation currency for the consolidated financial statements.

In preparing the financial statements of the individual entities, transactions in foreign currencies other than the entity’s functional currency are recorded at the rates of exchange prevailing at the dates of the transactions. At each balance sheet date, monetary assets and liabilities denominated in foreign currencies are retranslated at the rates prevailing at the balance sheet date. Non-monetary items that are measured in terms of historical cost in a foreign currency are not retranslated. The income and expenses of foreign operations are translated to euros at average exchange rates.

Foreign operations

For the purpose of presenting consolidated financial statements, the assets and liabilities of the Group’s foreign operations are expressed in euros using exchange rates prevailing at the balance sheet date. Income and expense items are translated at average exchange rates for the period. Exchange differences, if any, arising on net investments including receivables from or payables to a foreign operation for which settlement is neither planned nor likely to occur, are recognized directly in the foreign currency translation reserve (FCTR) within equity. When control over a foreign operation is lost, in part or in full, the relevant amount in the FCTR is transferred to profit or loss.

Borrowing costs

Borrowing costs directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time to get ready for their intended use or sale, are added to the cost of those assets, until such time as the assets are substantially ready for their intended use or sale. All other borrowing costs are recognized in profit or loss in the period in which they are incurred.

Borrowing costs are capitalized based on the effective interest rate of the Senior Secured Notes.

Statement of cash flows

The consolidated statement of cash flows is prepared using the indirect method. The cash flow statement distinguishes between operating, investing and financing activities.

Cash flows in foreign currencies are converted at the exchange rate at the dates of the transactions. Currency exchange differences on cash held are separately shown. Payments and receipts of corporate income taxes and interest paid are included as cash flow from operating activities.

Financial instruments

Derivative financial instruments

Derivatives are initially recognized at fair value; any attributable transaction costs are recognized in profit and loss as they are incurred. Subsequent to initial recognition, derivatives are measured at their fair value, and changes therein are generally recognized in profit and loss.

When a derivative is designated as a cash flow hedging instrument, the effective portion of changes in the fair value of the derivative is recognized in other comprehensive income and accumulated in the hedging reserve. Any ineffective portion of changes in the fair value of the derivative is recognized immediately in profit or loss.

The amount accumulated in equity is retained in other comprehensive income and reclassified to the profit or loss in the same period, or periods, during which the hedged item affects profit or loss.

If the hedging instrument no longer meets the criteria for hedge accounting, expires, is sold, terminated or exercised, or the designation is revoked, hedge accounting is discontinued prospectively. If the forecast transaction is no longer expected to occur, the amount accumulated in equity is reclassified to profit or loss.

Fair values are obtained from quoted market prices in active markets or, where an active market does not exist, by using valuation techniques. Valuation techniques include discounted cash flow models.

Non-derivative financial instruments

Non-derivative financial instruments comprise trade and other receivables, cash and cash equivalents, loans and borrowings, and trade and other payables.

Non-derivative financial instruments are recognized initially at fair value, net of any directly attributable transaction costs. Subsequent to initial recognition, non-derivative financial instruments are measured at amortized cost using the effective interest method, less any impairment losses.

The Group de-recognizes a financial asset when the contractual rights to the cash flows from the asset expire, or it transfers the right to receive the contractual cash flows in a transaction in which substantially all the risk and rewards of ownership of the financial asset are transferred. Any interest in such transferred financial assets that is created or retained by the Group is recognized as a separate asset or liability.

Financial assets and liabilities are offset and the net amount presented in the statement of financial position when, and only when, the Group has a legal right to offset the amounts and intends either to settle on a net basis or to realize the asset and settle the liability simultaneously.

Financial assets are designated as at fair value through profit and loss if the Group manages such investments and makes purchase and sale decisions based on their fair value in accordance with the Group’s risk management or investment strategy. Attributable transaction costs are recognized in profit and loss as incurred. Financial assets at fair value through profit and loss are measured at fair value and changes therein, which takes into account any dividend income, are recognized in profit and loss.

The fair values of investments in equity are determined with reference to their quoted closing bid price at the measurement date or, if unquoted, using a valuation technique.

The convertible loan given, is presented as ‘Other investment’ on the balance sheet. This loan is initially measured at fair value plus any directly attributable transaction costs. Subsequent to initial recognition, it is measured at amortized costs using the effective interest method.

Trade receivables and other current assets

Trade receivables and other current assets are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less provision for impairment.

A provision for impairment of trade receivables and other current assets is established when there is objective evidence that the Group will not be able to collect all amounts due according to the original term of the receivables. Significant financial difficulties of the debtor, probability that the debtor will enter bankruptcy or financial reorganization, and default or delinquency in payments are considered indicators that the trade receivable is impaired.

The amount of the provision is the difference between the asset’s carrying amount and the present value of estimated future cash flows, discounted at the original effective interest rate. The carrying amount of the asset is reduced through the use of an allowance account, and the amount of the loss is recognized in the income statement.

When a trade receivable and other current asset is uncollectable, it is written off against the allowance account for trade receivables. Subsequent recoveries of amounts previously written off are credited in the income statement.

Cash and cash equivalents

Cash and cash equivalents includes cash in hand, deposits held at call with banks and other short-term highly liquid investments with original maturities of three months or less. Cash and cash equivalents, including short-term investments, is valued at face value, which equals its fair value. Collaterized cash is included in other (non-) current assets and accounted for at face value, which equals its fair value.

Trade payables and other current liabilities

Trade payables and other current liabilities are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method.

Share capital

Ordinary shares are classified as equity. Incremental costs directly attributable to the issue of ordinary shares and share options are recognized as a deduction from equity, net of any tax effects.

Property, plant and equipment

Property, plant and equipment are measured at cost less accumulated depreciation and accumulated impairment losses.

Cost includes expenditure that is directly attributable to the acquisition or construction of the asset and comprises purchase cost, together with the incidental costs of installation and commissioning. These costs include external consultancy fees, capitalized borrowing costs, rent and associated costs attributable to bringing the assets to a working condition for their intended use and internal employment costs that are directly and exclusively related to the underlying asset. In case of operating leases where it is probable that the lease contract will not be renewed, the cost of self-constructed assets includes the estimated costs of dismantling and removing the items and restoring the site on which they are located.

When parts of an item of property, plant and equipment have different useful lives, they are accounted for as separate items (major components) of property, plant and equipment.

Gains and losses on disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount of property, plant and equipment and are recognized within income.

The cost of replacing part of an item of property, plant and equipment is recognized in the carrying amount of the item if it is probable that the future economic benefits embodied within the part will flow to the Group and its cost can be measured reliably. The carrying amount of the replaced part is de-recognized. The costs of the day-to-day servicing of property, plant and equipment are recognized in profit or loss as incurred.

Depreciation is calculated from the date an asset becomes available for use and is depreciated on a straight-line basis over the estimated useful life of each part of an item of property, plant and equipment. Leased assets are depreciated on the same basis as owned assets over the shorter of the lease term and their useful lives. The principal periods used for this purpose are:

•  Data center freehold land	Not depreciated
•  Data center buildings	15-30 years
•  Data center infrastructure and equipment	5-20 years
•  Office equipment and other	3-15 years

Depreciation methods, useful lives and residual values are reviewed annually.

Data center freehold land consists of the land owned by the Company and land leased by the Company under finance lease agreements. The data center buildings consist of the core and shell in which we have constructed a data center. Data center infrastructure and equipment comprises data center structures, leasehold improvements, data center cooling and power infrastructure, including infrastructure for advanced environmental controls such as ventilation and air conditioning, specialized heating, fire detection and suppression equipment and monitoring equipment. Office equipment and other is comprised of office leasehold improvements and office equipment consisting of furniture and computer equipment.

Intangible assets and goodwill

Intangible assets represent power grid rights, software and other intangible assets, and are recognized at cost less accumulated amortization and accumulated impairment losses. Other intangible assets principally consist of lease premiums (paid in addition to obtain rental contracts).

Software includes development expenditure, which is capitalized only if development costs can be measured reliably, the product or process is technically and commercially feasible, future economic benefits are probable, and the Group intends to and has sufficient resources to complete development and to use the asset. The expenditure capitalized includes the cost of material, services and direct labor costs that are directly attributable to preparing the asset for its intended use.

Amortization is calculated on a straight-line basis over the estimated useful lives of the intangible asset. Amortization methods, useful lives are reviewed annually.

The estimated useful lives are:

•  Power grid rights	10–15 years
•  Software	3–5 years
•  Other	3–12 years
•  Customer portfolio	20 years

Goodwill represents the goodwill related to business combinations, which is determined based on purchase price allocation. Goodwill is not being amortized, and subject to an annual impairment test.

Impairment of non-financial assets

The carrying amounts of the Group’s non-financial assets, are reviewed at each reporting date to determine whether there is any indication of impairment. If any such indication exists, then the asset’s recoverable amount is estimated. For intangible assets that are not yet available for use, the recoverable amount is estimated annually.

The recoverable amount of an asset or cash-generating unit is the greater of either its value in use or its fair value less costs to sell. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. For the purpose of impairment testing, assets are grouped together into the smallest group of assets that generates cash inflows from continuing use that are largely independent of the cash inflows of other assets or groups of assets (the “cash-generating unit”).

Considering the Company manages its data centers by country, and, given the data center campus-structures, the financial performance of data centers within a country is highly inter-dependent, the Company has determined that the cash-generating unit for impairment-testing purposes should be the group of data centers per country, unless specific circumstances would indicate that a single data center is a cash-generating unit.

An impairment loss is recognized if the carrying amount of an asset or its cash-generating unit exceeds its estimated recoverable amount. Impairment losses are recognized in profit or loss. Impairment losses recognized in respect of cash-generating units are to reduce the carrying amount of the assets in the unit (group of units) on a pro-rata basis.

Impairment losses recognized in prior periods are assessed at each reporting date for any indications that the loss has decreased or no longer exists. An impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss previously recognized on assets other than goodwill, is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized.

Borrowings

Borrowings are recognized initially at fair value, net of transaction costs incurred. Borrowings are subsequently stated at amortized cost; with any difference between the proceeds (net of transaction costs) and the redemption value recognized in the income statement over the period of the borrowings using the effective interest method.

Borrowings are classified as current liabilities unless the Group has an unconditional right to defer settlement of the liability for at least 12 months after the balance sheet date. The Group de-recognizes a borrowing when its contractual obligations are discharged, cancelled or expired.

As part of the initial measurement of the amortized cost value of the Senior Secured Notes due 2020, it is assumed that the Notes will be held to maturity. If an early redemption of all or part of the Notes is expected, the liability will be re-measured based on the original effective interest rate. The difference between the liability, excluding a change in assumed early redemption and the liability, including a change in assumed early redemption, will be recognized in profit and loss.

Provisions

A provision is recognized in the statement of financial position when the Group has a present legal or constructive obligation as a result of a past event; it is probable that an outflow of economic benefits will be required to settle the obligation and the amount can be estimated reliably. Provisions are determined by discounting the expected future cash flows at a pre-tax rate that reflects current market assessments of the time value of money and, where appropriate, the risks specific to the liability. The discount rate arising on the provision is amortized in future years through interest.

A provision for site restoration is recognized when costs for restoring leasehold premises to their original condition at the end of the lease are probable to be incurred and it is possible to make an accurate estimate of these costs. The discounted cost of the liability is included in the related assets and is depreciated over the remaining estimated term of the lease. If the likelihood of this liability is estimated to be possible, rather than probable, it is disclosed as a contingent liability in Note 26.

A provision for onerous lease contracts is recognized when the expected benefits to be derived by the Group from a contract are lower than the unavoidable cost of meeting its obligations under the contract. The provision is measured at the discounted amount of future losses expected to be incurred in respect of unused data center sites over the term of the leases. Where unused sites can be sublet or partly sublet, management has taken account of the sublease income expected to be received over the minimum sublease term, which meets the Group’s revenue recognition criteria in arriving at the amount of future losses. Before a provision is established, the Group recognizes any impairment loss on the assets associated with that contract.

Leases

Leases, in which the Group assumes substantially all the risks and rewards of ownership, are classified as finance leases. On initial recognition, the leased asset is measured at an amount equal to the lower of either its fair value or the present value of the minimum lease payments. Subsequent to initial recognition, the asset is accounted for in accordance with the accounting policy applicable to that asset. The finance lease obligations are presented as part of the long-term liabilities and, as far as amounts need to be repaid within one year, as part of current liabilities.

Other leases are operating leases and the leased assets are not recognized on the Group’s statement of financial position. Payments made under operating leases are recognized in the income statement, or capitalized during construction, on a straight-line basis over the term of the lease. Lease incentives received are recognized as an integral part of the total lease expense, over the term of the lease.

Minimum finance lease payments are apportioned between the finance charge and the reduction of the outstanding liability. The finance charge is allocated to each period during the lease term so as to produce a constant periodic rate of interest on the remaining balance of the liability.

At inception or modification of an arrangement, the Group determines whether such an arrangement is, or contains, a lease. This will be the case if the following two criteria are met:

• the fulfilment of the arrangement is dependent on the use of a specific asset or assets; and

• the arrangement contains the right to use an asset.

For leased properties on which our data centers are located, we generally seek to secure property leases for terms of 20 to 25 years. Where possible, we try to mitigate the long-term financial commitment by contracting for initial lease terms for a minimum period of 10 to 15 years with the option for us either to (i) extend the leases for additional five-year terms or (ii) terminate the leases upon expiration of the initial 10- to 15-year term. Our leases generally have consumer price index based annual rent increases over the full term of the lease. Certain of our leases contain options to purchase the asset.

Segment reporting

The segments are reported in a manner consistent with internal reporting provided to the chief operating decision-maker, identified as the Board of Directors. There are two segments: the first is France, Germany, The Netherlands and the United Kingdom (the “Big4”), the second is Rest of Europe, which comprises Austria, Belgium, Denmark, Ireland, Spain, Sweden and Switzerland. Shared expenses such as corporate management, general and administrative expenses, loans and borrowings and related expenses and income tax assets and liabilities are stated in Corporate and other. The Big4 and Rest of Europe are different segments as management believes that the Big4 countries represent the largest opportunities for Interxion, from market trends and growth perspective to drive the development of its communities of interest strategy within customer segments and the attraction of magnetic customers. As a result, over the past three years we have invested between 68% and 70% of our capital expenditure in the Big4 segment while revenue constituted an average of 64% of total revenue over the same period.

Segment results, assets and liabilities include items directly attributable to a segment as well as those that can be allocated on a reasonable basis. Unallocated items presented as Corporate and other principally comprise loans and borrowings and related expenses; corporate assets and expenses (primarily the Company’s headquarters); and income tax assets and liabilities.

Segment capital expenditure is defined as the net cash outflow during the period to acquire property, plant and equipment, and intangible assets other than goodwill, during the period.

Adjusted EBITDA, Recurring revenue and Cash generated from operations, are additional indicators of our operating performance, and are not required by or presented in accordance with IFRS. We define Adjusted EBITDA as Operating income adjusted for the following items, which may occur in any period, and which management believes are not representative of our operating performance:

• Depreciation and amortization – property, plant and equipment and intangible assets (except goodwill) are depreciated on a straight-line basis over the estimated useful life. We believe that these costs do not represent our operating performance.

• Share-based payments – primarily the fair value at the grant date to employees of equity awards, is recognized as an employee expense over the vesting period. We believe that this expense does not represent our operating performance.

• Income or expense related to the evaluation and execution of potential mergers or acquisitions (“M&A”) – under IFRS, gains and losses associated with M&A activity are recognized in the period incurred. We exclude these effects because we believe they are not reflective of our on-going operating performance.

• Adjustments related to terminated and unused data center sites – these gains and losses relate to historical leases entered into for certain brownfield sites, with the intention of developing data centers, which were never developed and for which management has no intention of developing into data centers. We believe the impact of gains and losses related to unused data centers are not reflective of our business activities and our on-going operating performance.

In certain circumstances, we may also adjust for items that management believes are not representative of our current on-going performance. Examples of this would include: adjusting for the cumulative effect of a change in accounting principle or estimate, impairment losses, litigation gains and losses or windfall gains and losses.

We define Recurring revenue as revenue incurred monthly from colocation, connectivity and associated power charges, office space, amortized set-up fees and certain recurring managed services (but excluding any ad hoc managed services) provided by us directly or through third parties, excluding rents received for the sublease of unused sites.

Cash generated from operations is defined as net cash flows from operating activities, excluding interest and corporate income tax payments and receipts. Management believe that the exclusion of these items, provides useful supplemental information to net cash flows from operating activities to aid investors in evaluating the cash generating performance of our business.

We believe Adjusted EBITDA, Recurring revenue and Cash generated from operations provide useful supplemental information to investors regarding our on-going operational performance. These measures help us and our investors evaluate the on-going operating performance of the business after removing the impact of our capital structure (primarily interest expense) and our asset base (primarily depreciation and amortization). Management believes that the presentation of Adjusted EBITDA, when combined with the primary IFRS presentation of net income, provides a more complete analysis of our operating performance. Management also believes the use of Adjusted EBITDA facilitates comparisons between us and other data center operators (including other data center operators that are REITs) and other infrastructure-based businesses. Adjusted EBITDA is also a relevant measure used in the financial covenants of our 2017 Senior Secured Revolving Facility, our 2013 Super Senior Revolving Facility and our 6.00% Senior Secured Notes due 2020.

This information, provided to the chief operating decision-maker, is disclosed to permit a more complete analysis of our operating performance. Exceptional items are those significant items that are separately disclosed by virtue of their size, nature or incidence to enable a full understanding of the Group’s financial performance.

Revenue recognition

Revenue is recognized when it is probable that future economic benefits will flow to the Group and that these benefits, together with their related costs, can be measured reliably. Revenue is measured at the fair value of the consideration received or receivable taking into account any discounts or volume rebates.

The Group reviews transactions for separately identifiable components and, if necessary, applies individual recognition treatment, revenues are allocated to separately identifiable components based on their relative fair values.

The Group earns colocation revenue as a result of providing data center services to customers at its data centers. Colocation revenue and lease income are recognized in profit or loss on a straight-line basis over the term of the customer contract. Incentives granted are recognized as an integral part of the total income, over the term of the customer contract. Customers are usually invoiced quarterly in advance and income is recognized on a straight-line basis over the quarter. Initial setup fees payable at the beginning of customer contracts are deferred at inception and recognized in the income statement on a straight-line basis over the initial term of the customer contract. Power revenue is recognized based on customers’ usage.

Other services revenue, including managed services, connectivity and customer installation services including equipment sales are recognized when the services are rendered. Certain installation services and equipment sales, which by their nature have a non-recurring character, are presented as Non-recurring revenues and are recognized on delivery of service.

Deferred revenues relating to invoicing in advance and initial setup fees are carried on the statement of financial position as part of trade payables and other liabilities. Deferred revenues due to be recognized after more than one year are held in non-current liabilities.

Cost of sales

Cost of sales consists mainly of rental costs for the data centers and offices, power costs, maintenance costs relating to the data center equipment, operation and support personnel costs and costs related to installations and other customer requirements. In general, maintenance and repairs are expensed as incurred. In cases where maintenance contracts are in place, the costs are recorded on a straight-line basis over the contractual period.

Sales and marketing costs

The operating expenses related to sales and marketing consist of costs for personnel (including sales commissions), marketing and other costs directly related to the sales process. Costs of advertising and promotion are expensed as incurred.

General and administrative costs

General and administrative costs are expensed as incurred and include amortization and depreciation expenses.

Employee benefits

Defined contribution pension plans

A defined contribution pension plan is a post-employment plan under which an entity pays fixed contributions into a separate entity and has no legal or constructive obligation to pay further amounts. Obligations for contributions to defined contribution plans are recognized as an employee benefit expense in the income statement in the periods during which the related services are rendered by employees. Prepaid contributions are recognized as an asset to the extent that a cash refund or a reduction in future payments is available. Contributions to a defined contribution plan, which are due more than 12 months after the end of the period in which the employees render the service, are discounted to their present value.

Termination benefits

Termination benefits are recognized as an expense when the Group is demonstrably committed, without realistic possibility of withdrawal, to a formal detailed plan to either terminate employment before the normal retirement date, or to provide termination benefits as a result of an offer made to encourage voluntary redundancy. Termination benefits for voluntary redundancy are recognized as an expense if the Group has made an offer of voluntary redundancy, it is probable that the offer will be accepted, and the number of acceptances can be estimated reliably. If benefits are payable more than 12 months after the reporting date, they are discounted to their present value.

Share-based payments

The long-term incentive plans enable Group employees to earn and/or acquire shares of the Group. The fair value at the grant date to employees of share options, as determined using the Black Scholes model for options and the Monte Carlo model for the performance shares, is recognized as an employee expense, with a corresponding increase in equity, over the period that the employees become unconditionally entitled to the options and/or shares. Restricted shares are valued based on the market value at grant date. The amount recognized as an expense is adjusted to reflect the actual number of share options, restricted and performance shares that vest.

Finance income and expense

Finance expense includes interest payable on borrowings calculated using the effective interest rate method, gains on financial assets recognized at fair value through profit and loss and foreign exchange gains and losses. Borrowing costs directly attributable to the acquisition or construction of data center assets, which are assets that necessarily take a substantial period of time to get ready for their intended use, are added to the costs of those assets, until such time as the assets are ready for their intended use.

Interest income is recognized in the income statement as it accrues, using the effective interest method. The interest expense component of finance lease payments is recognized in the income statement using the effective interest rate method.

Foreign currency gains and losses are reported on a net basis, as either finance income or expenses, depending on whether the foreign currency movements are in a net gain or a net loss position.

Income tax

Income tax on the profit or loss for the year comprises current and deferred tax. Income tax is recognized in the income statement except to the extent that it relates to items recognized directly in equity, in which case it is recognized in equity.

Current tax is the expected tax payable on the taxable income for the year, using tax rates enacted or substantially enacted at the balance sheet date, and any adjustment to tax payable in respect of previous years.

Deferred tax is recognized in respect of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. The following temporary differences are not provided for: the initial recognition of assets or liabilities that affect neither accounting nor taxable profit, nor differences relating to investments in subsidiaries to the extent that they will probably not reverse in the foreseeable future. The amount of deferred tax provided is based on the expected manner of realization or settlement of the carrying amount of assets and liabilities, using tax rates enacted or substantively enacted at the balance sheet date that are expected to be applied to temporary differences when they reverse or loss carry forwards when they are utilized.

A deferred tax asset is also recognized for unused tax losses and tax credits. A deferred tax asset is recognized only to the extent that it is probable that future taxable profits will be available against which the asset can be utilized. Deferred tax assets are reduced to the extent that it is no longer probable that the related tax benefit will be realized.

Additional income taxes that arise from the distribution of dividends are recognized at the same time as the liability to pay the related dividend.

In determining the amount of current and deferred tax, the Company takes into account the impact of uncertain tax positions and whether additional taxes, penalties and interest may be due. The Company believes that its accruals for tax liabilities are adequate for all open tax years based on its assessment of many factors, including interpretations of tax law and prior experience. This assessment relies on estimates and assumptions and may involve a series of judgments about future events. New information may become available that causes the Company to change its judgment regarding the adequacy of existing tax liabilities; such changes to tax liabilities will have an impact on tax expense in the period that such a determination is made.

Deferred tax assets and liabilities are offset if there is a legally enforceable right to offset current tax liabilities and assets, and they relate to taxes levied by the same tax authority on the same taxable entity, or on different tax entities, but they intend to settle current tax liabilities and assets on a net basis of their tax assets and liabilities will be realized simultaneously.

Earnings per share

The Group presents basic and diluted earnings per share (EPS) data for its ordinary shares. Basic EPS is calculated by dividing the profit or loss attributable to ordinary and preference shareholders of the Company by the weighted average number of ordinary shares outstanding during the year. Diluted EPS is determined by adjusting the basic earnings per share for the effects of all dilutive potential ordinary shares, which comprise the share options granted.

New standards and interpretations not yet adopted

The new standards, amendments to standards and interpretations listed below are available for early adoption in the annual period beginning January 1, 2017, although they are not mandatory until a later period. The Group has decided not to adopt these new standards or interpretations until a later point in time.

Effective date	New standard or amendments
Deferred indefinitely	Amendments to IFRS 10 and IAS 28: Sale or contribution of assets between an investor and its associate or joint venture
January 1, 2018	IFRS 15 – Revenue from Contracts with Customers;
January 1, 2018	IFRS 9 – Financial Instruments;
January 1, 2018	Amendments to IFRS 2: Classification and measurement of share-based payment transactions;
January 1, 2019	IFRS 16 – Leases.

IFRS 9 – Financial Instruments

IFRS 9 contains a new classification and measurement approach for financial assets that reflects the business model in which assets are managed and their cash flow characteristics. IFRS 9 contains three principal classification categories for financial assets: measured at amortized cost, at fair value through other comprehensive income (“FVOCI”) and at fair value through profit and loss (“FVTPL”). The standard eliminates the existing IAS 39 categories of held to maturity, loans and receivables and available for sale.

Under IFRS 9, derivatives embedded in contracts where the host is a financial asset in the scope of the standard are never bifurcated. Instead, the hybrid financial instrument as a whole is assessed for classification.

Based on its assessment, the Company does not believe that the new classification requirements will have a material impact on its accounting for financial instruments.

When implementing IFRS 9, the Company will take advantage of the exemption allowing it not to restate comparative information for prior periods with respect to classification and measurement.

IFRS 15 – Revenue from Contracts with Customers

In 2014, the IASB issued IFRS 15 Revenue from Contracts with Customers. This standard specifies how and when revenue is recognized, and includes enhanced disclosure requirements.

IFRS 15 replaces existing revenue recognition standards IAS 11 Construction Contracts and IAS 18 Revenue, and certain revenue-related interpretations. The Group will implement IFRS 15 using the modified retrospective method.

The new standard provides a single, principles based five-step model to be applied to all contracts with customers. The core principle of IFRS 15 is that an entity recognizes revenue related to the transfer of promised goods or services when control of the goods or services passes to the customer. The amount of revenue recognized should reflect the consideration to which the entity expects to be entitled in exchange for those goods or services.

We have completed our assessment of the impact of the adoption of IFRS 15 and concluded that the new standard will have no significant financial impact. This is due to the fact that we concluded that the services provided to our customers do meet the requirements to apply the series guidance under IFRS 15. Under the new standard, a series of distinct goods or services will be accounted for as a single performance obligation if they are substantially the same, have the same pattern of transfer and both of the following criteria are met:

(i) each distinct good or service in the series represents a performance obligation that would be satisfied over time; and

(ii) the entity would measure its progress towards satisfaction of the performance obligation using the same measure of progress for each distinct good or service in the series.

The principles in the new revenue standard are therefore applied to the single performance obligation as the series criteria are met, rather than the individual services that make up the single performance obligation. As a result, revenue is allocated to the relative standalone selling price of the series as one performance obligation, rather than to each distinct service within it.

We have determined that the measure of progress for the single performance obligation that best depicts the transfer of the services is the one-month (time) increment. By applying the series guidance on such basis Interxion revenues will be recognized on a monthly basis in line with the satisfaction of the monthly increment of service which is in line with current accounting for these revenues.

IFRS 16 - Leases

In January 2016, the International Accounting Standards Board (IASB) issued IFRS 16 Leases, the new accounting standard for leases. The new standard is effective for annual periods beginning on or after 1 January 2019 and will replace IAS 17 Leases and IFRIC 4 Determining whether an Arrangement contains a Lease. IFRS 16 has been endorsed by the EU in October 2017.

The new standard requires lessees to apply a single, on-balance sheet accounting model to all its leases, unless a lessee elects the recognition exemptions for short-term leases and/or leases of low-value assets. A lessee must recognize a right-of-use asset representing its right to use the underlying asset and a lease obligation representing its obligation to make lease payments. The standard permits a lessee to elect either a full retrospective or a modified retrospective transition approach.

The Company is investigating whether certain elements of its contracts with customers will be subject to lessor accounting under the requirements of IFRS 16. Generally, the impact on the income statement is that operating lease expenses will no longer be recognized. The impact of lease contracts on the consolidated income, which is currently part of the operating expenses, will be included in amortization (related to the right of use asset) and interest (related to the lease liability). As a result, key metrics such as operating profit and Adjusted EBITDA are likely to change significantly. Compared to current lease accounting, total expenses will be higher in the earlier years of a lease and lower in the later years. The impact on the consolidated statement of cash flows will be visible in higher Net cash flows from operating activities, since cash payments allocated to the repayment of the lease liability will be included in Net cash flow from financing activities.

We are in the process of assessing the impact of IFRS 16 on the consolidated financial statements. We are not yet in the position to conclude on this. However, based on the work we have done so far, based on current lease commitments of EUR 361 million (see note 24), this standard is likely to have a material impact on the measurement of assets and liabilities and on classifications in the Consolidated income statement and Consolidated statement of cash flows.

These new principles will be applied by Interxion from the annual reporting period starting on 1 January 2019. The Group has elected to apply the recognition exemptions that are allowed under the modified retrospective transition method.

We expect to be in a position to give more detail and an indication of potential impact during 2018.

XML

Financial risk management

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Financial risk management

4 Financial risk management

Overview

The Group has exposure to the following risks from its use of financial instruments:

• credit risk;

• liquidity risk;

• market risk;

• other price risks.

This note presents information about the Group’s exposure to each of the above risks, the Group’s goals, policies and processes for measuring and managing risk, and its management of capital. Further quantitative disclosures are included throughout these consolidated financial statements.

The Board of Directors has overall responsibility for the oversight of the Group’s risk management framework.

The Group continues developing and evaluating the Group’s risk management policies with a view to identifying and analyzing the risks faced, to setting appropriate risk limits and controls, and to monitoring risks and adherence to limits. Risk management policies and systems are reviewed regularly to reflect changes in market conditions and the Group’s activities. The Group, through its training and management standards and procedures, aims to develop a disciplined and constructive control environment in which all employees understand their roles and obligations.

The Board of Directors oversees the way management monitors compliance with the Group’s risk management policies and procedures and reviews the adequacy of the risk management framework in relation to the risks the Group faces.

Credit risk

Credit risk is the risk of financial loss to the Group if a customer, bank or other counterparty to a financial instrument were to fail to meet its contractual obligations. It principally arises from the Group’s receivables from customers. The Group’s most significant customer, which is serviced from multiple locations and under a number of service contracts, accounted for 14% of revenues in 2017, for 13% of revenues in 2016, and for 11% in 2015.

Trade and other receivables

The Group’s exposure to credit risk is mainly influenced by the individual characteristics of each customer. The makeup of the Group’s customer base, including the default risk of the industry and the country in which customers operate, has less of an influence on credit risk.

The Group has an established credit policy under which each new customer is analyzed individually for creditworthiness before it begins to trade with the Group. If customers are independently rated, these ratings are used. If there is no independent rating, the credit quality of the customer is analyzed taking its financial position, past experience and other factors into account.

The Group’s standard terms require invoices for contracted services to be settled before the services are delivered. In addition to the standard terms, the Group provides service-fee holidays on long-term customer contracts, for which an accrued revenue balance is accounted. In the event that a customer fails to pay amounts that are due, the Group has a clearly defined escalation policy that can result in a customer’s access to their equipment being denied or in service to the customer being suspended.

In 2017, 95% (2016: 95% and 2015: 94%) of the Group’s revenue was derived from contracts under which customers paid an agreed contracted amount, including power on a regular basis (usually monthly or quarterly) or from deferred initial setup fees paid at the outset of the customer contract.

As a result of the Group’s credit policy and the contracted nature of the revenues, losses have been infrequent (see Note 21). The Group establishes an allowance that represents its estimate of potential incurred losses in respect of trade and other receivables. This allowance is entirely composed of a specific loss component relating to individually significant exposures.

Loans given

The Group has given a USD 4.5 million convertible loan to Icolo Ltd, a start-up company that has set up a data center business in Kenya. Of this loan, USD 4.0 million was disbursed as at December 31, 2017.

Bank counterparties

The Group has certain obligations under the terms of its Revolving Facility Agreements and Senior Secured Notes which limit disposal of surplus cash balances. The Group monitors its cash position, including counterparty and term risk, on a daily basis.

Guarantees

Certain of our subsidiaries have granted guarantees to our lending banks in relation to our facilities. The Company grants rent guarantees to landlords of certain of the Group’s property leases (see Note 25).

Liquidity risk

Liquidity risk is the risk that the Group will not be able to meet its financial obligations as they fall due. The Group’s approach to managing liquidity is to ensure, as far as possible, that it will always have sufficient liquidity to meet its liabilities when due, under both normal and stressed conditions, without incurring unacceptable losses or risking damage to its reputation or jeopardizing its future.

The majority of the Group’s revenues and operating costs are contracted, which assists it in monitoring cash flow requirements, which it does on a daily and weekly basis. Typically, the Group ensures that it has sufficient cash on demand to meet expected normal operational expenses, including the servicing of financial obligations, for a period of 60 days; this excludes the potential impact of extreme circumstances, such as natural disasters, that cannot reasonably be predicted.

All significant capital expansion projects are subject to formal approval by the Board of Directors, and material expenditure or customer commitments are made only once the management is satisfied that the Group has adequate committed funding to cover the anticipated expenditure (see Note 23).

Senior Secured Notes

On July 3, 2013, the Company issued an aggregate principal amount of €325.0 million 6.00% Senior Secured Notes due 2020 (the “Senior Secured Notes due 2020”). The net proceeds of the offering were used to purchase all of the €260 million Senior Secured Notes due 2017, which were tendered in the offer for those notes and to redeem the €260 million Senior Secured Notes due 2017, which remained outstanding following the expiration and settlement of the tender offer and consent solicitation, to pay all related fees, expenses and premiums and for other general corporate purposes.

The Senior Secured Notes due 2020 are governed by an indenture dated July 3, 2013, between the Company, as issuer, and The Bank of New York Mellon, London Branch as Trustee. The indenture contains customary restrictive covenants including, but not limited to, limitations or restrictions on our ability to incur debt, grant liens, make restricted payments and sell assets. The restrictive covenants are subject to customary exceptions and are governed by a consolidated fixed charge ratio (Adjusted EBITDA to Finance Charges) to exceed 2.00 and a consolidated senior leverage ratio (Total Net Debt to Pro-forma EBITDA) not to exceed 4.00. In addition, the aggregate of any outstanding debt senior to our Senior Secured Notes should not exceed €100.0 million.

The obligations under the Senior Secured Notes due 2020 are guaranteed by certain of the Company’s subsidiaries.

On April 29, 2014, the Company completed the issuance of €150.0 million aggregate principal amounted of 6.00% Senior Secured Notes due 2020 (the “Additional Notes”). The net proceeds of the offering amount to €157.9 million, net of offering fees and expenses of €2.3 million. The net proceeds reflect the issuance of the Additional Notes at a premium at 106.75 and net of offering fees and expenses. The Additional Notes, which are guaranteed by certain subsidiaries of the Company, were issued under the indenture pursuant to which, on July 3, 2013, the Company issued €325.0 million in aggregate principal amount of 6.00% Senior Secured Notes due 2020.

On April 14, 2016, the Company completed the issuance of an additional €150.0 million aggregate principal amount of its 6.00% Senior Secured Notes due 2020 (together with the notes issued on April 29, 2014, the “Additional Notes”). The net proceeds of the offering amounted to €155.3 million, net of offering fees and expenses of €2.1 million. The net proceeds include the nominal value of the Additional Notes increased with a premium at 104.50. The Additional Notes, which are guaranteed by certain subsidiaries of the Company, were issued under the indenture dated July 3, 2013, pursuant to which the Company has previously issued €475.0 million in aggregate principal amount of 6.00% Senior Secured Notes due 2020.

Revolving Facility Agreements

2013 Super Senior Revolving Facility Agreement

On June 17, 2013, the Company entered into the Super Senior Revolving Facility Agreement.

On July 3, 2013, in connection with the issuance of the €325.0 million Senior Secured Notes due 2020, all conditions precedent to the utilization of the 2013 Super Senior Revolving Facility Agreement were satisfied. On July 31, 2017, the Company extended the maturity of the 2013 Super Senior Revolving Facility from July 3, 2018 to December 31, 2018.

As at December 31, 2017, the 2013 Super Senior Revolving Facility was undrawn.

2017 Senior Secured Revolving Facility Agreement

On March 9, 2017, the Company entered into the 2017 Senior Secured Revolving Facility Agreement.

The Senior Secured Revolving Facility had an initial maturity date of 12 months from the date of the Senior Secured Revolving Facility with the Company having the option to extend the maturity date by a further six-month period in accordance with the terms therein. The 2017 Senior Secured Revolving Facility initially bears interest at a rate per annum equal to EURIBOR (subject to a zero percent floor) plus a margin of 2.25% per annum, subject to a margin ratchet, pursuant to which the margin may be increased to a maximum of 3.25% per annum if the 2017 Senior Secured Revolving Facility is extended up to an additional six months after its initial maturity date.

On July 28, 2017, the Company amended the terms of the 2017 Senior Secured Revolving Facility to increase the amount available under the facility to €100.0 million and to add a second extension option to enable extension of the maturity of the 2017 Senior Secured Revolving Facility to December 31, 2018. The Company elected, as of March 1, 2018, to extend the maturity of the 2017 Senior Secured Revolving Facility to September 9, 2018.

As at December 31, 2017, the 2017 Senior Secured Revolving Facility was fully drawn.

Covenants regarding Revolving Facility Agreements

The Revolving Facility Agreements also require the Company to maintain a specified financial ratio. The restrictive covenants are subject to customary exceptions including, in relation to the incurrence of subordinated debt, a consolidated fixed charge ratio (calculated as a ratio of Adjusted EBITDA to consolidated interest expense), to exceed 2.00 to 1.00 on a pro forma basis for the four full fiscal quarters (taken as one period) for which financial statements are available immediately preceding the incurrence of such debt and, if such debt is senior debt, a consolidated senior leverage ratio (calculated as a ratio of outstanding senior debt net of cash and cash equivalents of the Company and its restricted subsidiaries (on a consolidated basis) to pro forma Adjusted EBITDA), to be less than 4.00 to 1.00 on a pro forma basis for the four full fiscal quarters (taken as one period) for which financial statements are available immediately preceding the incurrence of such debt.

The Revolving Facility Agreements also include a leverage ratio financial covenant (tested on a quarterly basis) that requires total net debt (calculated as a ratio to pro forma EBITDA) not to exceed a leverage ratio of 4.75 to 1.00 and stepping down to 4.00 to 1.00 for each applicable test date after (but not including) June 30, 2018. In addition, the Company must ensure, under the Revolving Facility Agreements, that the guarantors represent a certain percentage of Adjusted EBITDA, and a certain percentage of the consolidated net assets of the Group as a whole. Our ability to meet these covenants may be affected by events beyond our control and, as a result, we cannot assure you that we will be able to meet the covenants. In the event of a default under the Revolving Facility Agreements, the lenders could terminate their commitments and declare all amounts owed to them to be due and payable. Borrowings under other debt instruments that contain cross acceleration or cross default provisions, including the Senior Secured Notes, may as a result also be accelerated and become due and payable.

The breach of any of these covenants by the Company or the failure by the Company to maintain its leverage ratio could result in a default under the Revolving Facility Agreements. As of December 31, 2017, the Company’s consolidated fixed charge ratio stood at 4.92 and the net debt ratio/consolidated senior leverage ratio stood at 3.60.

On February 20, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility to waive, from the date of such consent becoming effective and up to, and including, May 1, 2018, the undertaking requiring certain material subsidiaries of the Company to accede to the 2013 Super Senior Revolving Facility Agreement as additional guarantors and, for the same period, to reduce the guarantor coverage threshold as a percentage of the group’s consolidated adjusted EBITDA (as more fully set out in the 2013 Super Senior Revolving Facility Agreement) from 85% to 80%. On April 19, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018

On February 19, 2018 the Company also received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the date by which certain subsidiaries of the Company are required to accede to the 2017 Senior Secured Revolving Facility Agreement as guarantors to April 30, 2018. On April 20, 2018, the Company received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018.

The Company also received, on March 1, 2018, the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement in relation to entering into the 2018 Subordinated Revolving Facility Agreement.

Interxion remained in full compliance with all its covenants. In addition, the Company does not anticipate, in the next twelve months, any breach or failure that would negatively impact its ability to borrow funds under the Revolving Facility Agreements.

Mortgages

On January 18, 2013, the Group completed two mortgage financings totaling €10.0 million. The loans are secured by mortgages on the PAR3 land, owned by Interxion Real Estate II Sarl, and the PAR5 land, owned by Interxion Real Estate III Sarl, and by pledges on the lease agreements, and are guaranteed by Interxion France SAS. The principal amounts on the two loans are to be repaid in quarterly installments in an aggregate amount of €167,000, commencing on April 18, 2013. The mortgages have a maturity of 15 years and have a variable interest rate based on EURIBOR plus an individual margin ranging from 240 to 280 basis points. The interest rates have been fixed through an interest rate swap for 75% of the principal outstanding amount for a period of ten years. No financial covenants apply to this loan next to the repayment schedule.

On June 26, 2013, the Group completed a €6.0 million mortgage financing. The loan is secured by a mortgage on the AMS3 property, owned by Interxion Real Estate V B.V., and a pledge on the lease agreement. The principal is to be repaid in annual instalments of €400,000 commencing May 1, 2014 and a final repayment of €4,400,000 due on May 1, 2018. The mortgage has a variable interest rate based on EURIBOR plus 275 basis points. The loan contains a minimum of 1.1 debt service capacity covenant ratio based on the operations of Interxion Real Estate V B.V.

On April 1, 2014, the Group completed a €9.2 million mortgage financing. The facility is secured by a mortgage on the data center property in Zaventem (Belgium), which was acquired by Interxion Real Estate IX N.V. on January 9, 2014, and a pledge on the lease agreement, and is guaranteed by Interxion Real Estate Holding B.V. The facility has a maturity of 15 years and has a variable interest rate based on EURIBOR plus 200 basis points. The principal amount is to be repaid in 59 quarterly instalments of €153,330 of which the first quarterly instalment was paid on July 31, 2014, and a final repayment of €153,330, which is due on April 30, 2029. No financial covenants apply to this loan next to the repayment schedule.

On October 13, 2015, the Group completed a €15.0 million mortgage financing. The facility is secured by a mortgage on the German real estate property owned by Interxion Real Estate I B.V. and a pledge on the lease agreement. The facility has a maturity of five years and has a variable interest rate based on EURIBOR plus 225 basis points. The principal amount is to be repaid in four annual instalments of €1,000,000 of which the first annual instalment was paid on September 30, 2016. The final repayment of €11,000,000 is due on September 30, 2020. No financial covenants apply to this loan in addition to the repayment schedule.

On April 8, 2016, the Group completed a €14.6 million financing. The facility is secured by a mortgage on the data center property in Vienna (Austria), acquired by Interxion Real Estate VII GmbH in January 2015, and a pledge on the lease agreement, and is guaranteed by Interxion Real Estate Holding B.V. The facility has a maturity of 14 years and nine months, and has a variable interest rate based on EURIBOR plus 195 basis points. The principal amount is due to be repaid in 177 monthly instalments, increasing from €76,000 to €91,750. The first monthly instalment of €76,000 was paid on April 30, 2016, and a final repayment of €91,750 is due on December 31, 2030.

On December 1, 2017, we renewed a €10.0 million mortgage financing entered into in 2012, which was secured by mortgages on the AMS6 property, owned by Interxion Real Estate IV B.V. The principal is to be repaid in annual instalments of €667,000 commencing December, 2018, and a final repayment of €7,332,000 due on December 31, 2022. The mortgage has a variable interest rate based on higher of 0% and EURIBOR plus 225 basis points.

Further details are in the Borrowing section (see Note 20).

Market risk

Currency risk

The Group is exposed to currency risk on sales, purchases and borrowings that are denominated in a currency other than the respective functional currencies of Group entities, primarily the euro, but also pounds sterling (GBP), Swiss francs (CHF), Danish kroner (DKK) and Swedish kronor (SEK). The currencies in which these transactions are primarily denominated are EUR, GBP, CHF, DKK, SEK and USD.

Historically, the revenues and operating costs of each of the Group’s entities have provided an economic hedge against foreign currency exposure and have not required foreign currency hedging.

It is anticipated that a number of capital expansion projects will be funded in a currency that is not the functional currency of the entity in which the associated expenditure will be incurred. In the event that this occurs and is material to the Group, the Group will seek to implement an appropriate hedging strategy.

The majority of the Group’s borrowings are euro denominated and the Company believes that the interest on these borrowings will be serviced from the cash flows generated by the underlying operations of the Group, the functional currency of which is the euro. The Group’s investments in subsidiaries are not hedged.

Interest rate risk

Following the issue of 6.00% Senior Secured Notes due 2020, the Group is not exposed to significant variable interest rate expense for borrowings.

On January 18, 2013, the Group completed two mortgage financings totaling €10.0 million. The loans are secured by mortgages, on the PAR3 land, owned by Interxion Real Estate II Sarl, and the PAR5 land, owned by Interxion Real Estate III Sarl, and pledges on the lease agreements, and are guaranteed by Interxion France SAS. The mortgages have a maturity of 15 years and have a variable interest rate based on EURIBOR plus an individual margin ranging from 240 to 280 basis points. The interest rates have been fixed through an interest rate swap for 75% of the principal outstanding amount for a period of ten years.

On June 26, 2013, the Group completed a €6.0 million mortgage financing. The loan is secured by a mortgage on the AMS3 property, owned by Interxion Real Estate V B.V., and a pledge on the lease agreement. The mortgage loan has a variable interest rate based on EURIBOR plus 275 basis points.

On April 1, 2014, the Group completed a €9.2 million mortgage financing. The facility is secured by a mortgage on the data center property in Zaventem (Belgium), which was acquired by Interxion Real Estate IX N.V. on January 9, 2014, and a pledge on the lease agreement, and is guaranteed by Interxion Real Estate Holding B.V. The mortgage loan has a variable interest rate based on EURIBOR plus 200 basis points.

On October 13, 2015, the Group completed a €15.0 million mortgage financing. The facility is secured by a mortgage on the real estate property in Germany, which is owned by Interxion Real Estate I B.V., and a pledge on the lease agreement. The facility has a maturity of five years and has a variable interest rate based on EURIBOR plus 225 basis points.

On April 8, 2016, the Group completed a €14.6 million financing. The facility is secured by a mortgage on the data center property in Vienna (Austria), acquired by Interxion Real Estate VII GmbH in January 2015, and a pledge on the lease agreement, and is guaranteed by Interxion Real Estate Holding B.V. The facility has a maturity of 14 years and nine months, and has a variable interest rate based on EURIBOR plus 195 basis points. The principal amount is due to be repaid in 177 monthly instalments, increasing from €76,000 to €91,750. The first monthly instalment of €76,000 was paid on April 30, 2016, and a final repayment of €91,750 is due on December 31, 2030.

On December 1, 2017, we renewed our mortgage on the AMS6 data center property. The existing mortgage loan was repaid and replaced by a new five-year €10.0 million mortgage, bearing a floating interest rate per annum equal to EURIBOR (subject to a zero percent floor) plus an individual margin of 225 basis points. Interest is due quarterly in arrears.

As at December 31, 2017, on the 2013 Super Senior Revolving Facility the interest payable on EUR amounts drawn would be at the rate of (i) in relation to any EUR amount drawn, EURIBOR plus 350 basis points, (ii) in relation to any Danish Kroner amounts drawn would be at the rate of CIBOR plus 350 basis points per annum, (iii) in relation to any Swedish Krona amounts drawn would be at the rate of STIBOR plus 350 basis points per annum and (iv) other applicable currencies, including GBP, amounts drawn at the rate of LIBOR plus 350 basis points per annum. The Super Senior Secured Revolving Facility was undrawn as at December 31, 2017.

The 2017 Senior Secured Revolving Facility initially bears interest at a rate of EURIBOR (subject to a zero percent floor) plus a margin of 2.25% per annum, subject to a margin ratchet, pursuant to which the margin may be increased to a maximum of 3.25% per annum if the 2017 Senior Secured Revolving Facility is extended up to an additional six months after its initial maturity date. This facility was fully drawn as at December 31, 2017.

Further details are in the Financial Instruments section (see Note 21).

Other risks

Price risk

There is a risk that changes in market circumstances, such as strong unanticipated increases in operational costs, construction of new data centers or churn in customer contracts, will negatively affect the Group’s income. Customers individually have short-term contracts that require notice before termination. The objective of market risk management is to manage and control market risk exposures within acceptable parameters, while optimizing the return.

The Group is a significant user of power and is exposed to increases in power prices. It uses independent consultants to monitor price changes in electricity and seeks to negotiate fixed-price term agreements with the power supply companies, not more than for own use, where possible. The risk to the Group is mitigated by the contracted ability to recover power price increases through adjustments in the pricing for power services.

Capital management

The Group has a capital base comprising its equity, including reserves, Senior Secured Notes, mortgage loans, finance leases and committed debt facilities. It monitors its solvency ratio, financial leverage, funds from operations and net debt with reference to multiples of its previous 12 months’ Adjusted EBITDA levels. The Company’s policy is to maintain a strong capital base and access to capital in order to sustain the future development of the business and maintain shareholders’, creditors’ and customers’ confidence.

The principal use of capital in the development of the business is through capital expansion projects for the deployment of further Equipped space in new and existing data centers. Major capital expansion projects are not initiated unless the Company has access to adequate capital resources to complete the project, and the projects are evaluated against target internal rates of return before approval. Capital expansion projects are continually monitored before and after completion.

There were no changes in the Group’s approach to capital management during the year.

XML

Information by segment

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Information by segment

5 Information by segment

Operating segments are to be identified on the basis of internal reports about components of the Group that are regularly reviewed by the chief operating decision maker in order to allocate resources to the segments and to assess their performance. Management monitors the operating results of its business units separately for the purpose of making decisions about performance assessments.

There are two segments: the first, The Big4, comprises France, Germany, The Netherlands and the United Kingdom; the second, Rest of Europe, comprises Austria, Belgium, Denmark, Ireland, Spain, Sweden and Switzerland. Shared expenses, such as corporate management, general and administrative expenses, loans and borrowings, and related expenses, and income tax assets and liabilities, are stated in Corporate and other.

The evaluation of the performance of the operating segments is primarily based on the measures of revenue and Adjusted EBITDA. Other information, except as noted below, provided to the Board of Directors is measured in a manner consistent with that in the financial statements.

The geographic information analyzes the Group’s revenues and non-current assets by country of domicile and other individually material countries. In presenting the geographic information, both revenue and assets excluding deferred tax assets and financial instruments are based on geographic location.

	Revenues						Non-current assets excluding deferred tax assets and financial instruments
	(€’000)						(€’000)
	2017		2016		2015		2017		2016		2015
France		86,180		68,816		62,007		261,558		223,917		189,926
Germany		106,069		84,449		68,568		374,893		281,935		231,309
The Netherlands		80,411		70,678		65,225		373,390		286,604		235,270
United Kingdom		45,977		45,831		51,114		87,955		81,156		96,747
Other countries		170,665		152,014		139,646		350,624		316,644		272,771
Total		489,302		421,788		386,560		1,448,420		1,190,256		1,026,023

Information by segment, 2017

	FR, DE, NL and UK			Rest of Europe			Subtotal			Corporate and other			Total
	(€’000)
Recurring revenue		302,346			160,170			462,516			—			462,516
Non-recurring revenue		16,291			10,495			26,786			—			26,786
Total revenue		318,637			170,665			489,302			—			489,302
Cost of sales		(119,931	)		(57,810	)		(177,741	)		(12,730	)		(190,471	)
Gross profit/(loss)		198,706			112,855			311,561			(12,730	)		298,831
Other income		97			—			97			—			97
Sales and marketing costs		(9,780	)		(5,891	)		(15,671	)		(17,794	)		(33,465	)
General and administrative costs		(87,903	)		(37,045	)		(124,948	)		(42,242	)		(167,190	)
Operating income		101,120			69,919			171,039			(72,766	)		98,273
Net Finance expense														(44,367	)
Profit before taxation														53,906
Total assets		1,229,960			393,644			1,623,604			78,467			1,702,071
Total liabilities		267,751			77,505			345,256			760,087			1,105,343
Capital expenditures, including intangible assets*		(174,818	)		(69,832	)		(244,650	)		(11,365	)		(256,015	)
Depreciation, amortization and impairments		72,721			29,365			102,086			6,166			108,252
Adjusted EBITDA(1)		174,818			99,665			274,483			(53,522	)		220,961

Information by segment, 2016

	FR, DE, NL and UK			Rest of Europe			Subtotal			Corporate and other(i)			Total
	(€’000)
Recurring revenue		256,004			143,954			399,958			—			399,958
Non-recurring revenue		13,770			8,060			21,830			—			21,830
Total revenue		269,774			152,014			421,788			—			421,788
Cost of sales		(100,921	)		(51,769	)		(152,690	)		(9,878	)		(162,568	)
Gross profit/(loss)		168,853			100,245			269,098			(9,878	)		259,220
Other income		333			—			333			—			333
Sales and marketing costs		(8,390	)		(5,209	)		(13,599	)		(16,342	)		(29,941	)
General and administrative costs		(73,238	)		(32,632	)		(105,870	)		(32,687	)		(138,557	)
Operating income		87,558			62,404			149,962			(58,907	)		91,055
Net Finance expense														(36,269	)
Profit before taxation														54,786
Total assets		990,406			363,444			1,353,850			128,815			1,482,665
Total liabilities		202,330			73,613			275,943			657,953			933,896
Capital expenditures, including intangible assets*		(170,707	)		(69,650	)		(240,357	)		(10,521	)		(250,878	)
Depreciation, amortization and impairments		60,128			25,371			85,499			4,336			89,835
Adjusted EBITDA(1)		148,191			88,195			236,386			(45,510	)		190,876

Information by segment, 2015

	FR, DE, NL and UK			Rest of Europe			Subtotal			Corporate and other(i)			Total
	(€’000)
Recurring revenue		232,624			132,551			365,175			—			365,175
Non-recurring revenue		14,290			7,095			21,385			—			21,385
Total revenue		246,914			139,646			386,560			—			386,560
Cost of sales		(93,311	)		(49,440	)		(142,751	)		(8,862	)		(151,613	)
Gross profit/(loss)		153,603			90,206			243,809			(8,862	)		234,947
Other income		365			—			365			20,923			21,288
Sales and marketing costs		(7,925	)		(5,145	)		(13,070	)		(15,147	)		(28,217	)
General and administrative costs		(62,828	)		(30,687	)		(93,515	)		(40,876	)		(134,391	)
Operating income		83,215			54,374			137,589			(43,962	)		93,627
Net Finance expense														(29,022	)
Profit before taxation														64,605
Total assets		878,568			309,218			1,187,786			64,278			1,252,064
Total liabilities		196,996			54,396			251,392			493,255			744,647
Capital expenditures, including intangible assets*		(131,812	)		(55,004	)		(186,816	)		(5,820	)		(192,636	)
Depreciation, amortization and impairments		50,317			23,688			74,005			4,224			78,229
Adjusted EBITDA(1)		134,328			78,868			213,196			(41,920	)		171,276

Note:— * Capital expenditure, including intangible assets, represent payments to acquire property, plant and equipment and intangible assets, as recorded in the consolidated statement of cash flows as “Purchase of property, plant and equipment” and “Purchase of intangible assets” respectively.

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Reconciliation to Adjusted EBITDA

Consolidated

	2017			2016(i)			2015(i)
	(€’000)
Net income		39,067			38,336			46,680
Income tax expense		14,839			16,450			17,925
Profit before taxation		53,906			54,786			64,605
Finance income		(1,411	)		(1,206	)		(5,742	)
Finance expense		45,778			37,475			34,764
Operating income		98,273			91,055			93,627
Depreciation, amortization and impairments		108,252			89,835			78,229
Share-based payments		9,929			7,890			9,047
Increase/(decrease) in provision for onerous lease contracts(4)		—			—			(184	)
M&A transaction break fee income(2)		—			—			(20,923	)
M&A transaction costs(3)		4,604			2,429			11,845
Income from sub-leases on unused data center sites(5)		(97	)		(95	)		(365	)
Increase/(decrease) in provision for site restoration(6)		—			(238	)		—
Adjusted EBITDA(1)		220,961			190,876			171,276

France, Germany, The Netherlands and the United Kingdom

	2017			2016			2015
	(€’000)
Operating income		101,120			87,558			83,215
Depreciation, amortization and impairments		72,721			60,128			50,317
Share-based payments		1,074			838			1,345
Increase/(decrease) in provision for onerous lease contracts(4)		—			—			(184	)
Income from sub-leases on unused data center sites(5)		(97	)		(95	)		(365	)
Increase/(decrease) in provision for site restoration(6)		—			(238	)		—
Adjusted EBITDA(1)		174,818			148,191			134,328

Rest of Europe

	2017		2016		2015
	(€’000)
Operating income		69,919		62,404		54,374
Depreciation, amortization and impairments		29,365		25,371		23,688
Share-based payments		381		420		806
Adjusted EBITDA(1)		99,665		88,195		78,868

Corporate and other

	2017			2016(i)			2015(i)
	(€’000)
Operating income		(72,766	)		(58,907	)		(43,962	)
Depreciation, amortization and impairments		6,166			4,336			4,224
Share-based payments		8,474			6,632			6,896
M&A transaction break fee income(2)		—			—			(20,923	)
M&A transaction costs(3)		4,604			2,429			11,845
Adjusted EBITDA(1)		(53,522	)		(45,510	)		(41,920	)

Notes:

1) “Adjusted EBITDA” is a non-IFRS financial measure within the meaning of the rules of the SEC. See “Non-IFRS Financial Measures” for more information on this measure, including why we believe that this supplemental measure is useful, and the limitations on the use of this supplemental measure.

2) “M&A transaction break fee income” represents the cash break up fee received following the termination of the Implementation Agreement in May 2015. This fee was included in “Other income”.

3) “M&A transaction costs” are costs associated with the evaluation, diligence and conclusion or termination of merger or acquisition activity. These costs are included in “General and administrative costs”.

4) “Increase/(decrease) in provision for onerous lease contracts” relates to those contracts in which we expect losses to be incurred in respect of unused data center sites over the term of the lease contract. This item is treated as ”General and administrative costs”.

5) “Income from sub-leases of unused data center sites” represents the income on sub-lease of portions of unused data center sites to third parties. This income is treated as ”Other income”.

6) “Increase/(decrease) in provision for site restoration” represents income or expense related to the termination of data center sites. This item is treated as ”Other income”.

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Revenue

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Revenue

6 Revenue

Revenue consists of colocation revenue derived from the rendering of data center services, which includes customer installation services and equipment sales.

XML

General and administrative costs

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

General and administrative costs

7 General and administrative costs

The general and administrative costs consist of the following components:    

	2017		2016(i)		2015(i)
	(€’000)
Depreciation, amortization and impairments		108,252		89,835		78,229
Share-based payments		9,929		7,890		9,047
(Increase)/decrease in provision for onerous lease contracts		—		—		(184	)
M&A transaction costs		4,604		2,429		11,845
Employee benefit expenses (excluding share-based payments)		16,918		16,279		16,395
Other general and administrative costs		27,487		22,124		19,059
		167,190		138,557		134,391

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Employee benefit expenses

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Employee benefit expenses

8 Employee benefit expenses

The Group employed an average of 638 employees (full-time equivalents) during 2017 (2016: 574 and 2015: 515). Costs incurred in respect of these employees were:

	2017		2016(i)		2015(i)
	(€’000)
Salaries and bonuses		50,580		44,556		42,333
Social security charges		8,147		7,113		6,780
Contributions to defined contribution pension plans		3,063		2,571		2,273
Other personnel-related costs		8,572		7,844		7,518
Share-based payments		9,929		7,890		9,047
		80,291		69,974		67,951

The following income statement line items include employee benefit expenses of:    

	2017		2016(i)		2015(i)
	(€’000)
Costs of sales		31,877		26,539		24,930
Sales and marketing costs		21,567		19,274		17,580
General and administrative costs		26,847		24,161		25,441
		80,291		69,974		67,951

The Group operates a defined contribution scheme for most of its employees. The contributions are made in accordance with the scheme and are expensed in the income statement as incurred.

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Finance income and expense

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Finance income and expense

9 Finance income and expense

	2017			2016			2015
	(€’000)
Bond premium and fees in income		1,188			790			—
Bank and other interest		223			135			82
Profit from sale of financial asset		—			281			2,289
Net foreign currency exchange gain		—			—			923
Finance income		1,411			1,206			3,294
Interest expense on Senior Secured Notes, bank and other loans		(37,706	)		(33,095	)		(27,094	)
Interest expense on finance leases		(3,667	)		(1,750	)		(3,139	)
Interest expense on provision for onerous lease contracts		—			(16	)		(115	)
Other financial expenses		(2,707	)		(1,765	)		(1,968	)
Net foreign currency exchanges loss		(1,698	)		(849	)		—
Finance expense		(45,778	)		(37,475	)		(32,316	)
Net finance expense		(44,367	)		(36,269	)		(29,022	)

In 2017 and 2016, the “Interest expense on Senior Secured Notes, bank and other loans” increased principally as result of the impact of the Additional Notes issued in April 2016 and the amounts drawn under the 2013 Super Senior Revolving Facility and the 2017 Senior Secured Revolving Facility.

“Profit from sale of financial asset” reflects the profit realized in 2015 and 2016 on the sale of the Group’s shares in iStreamPlanet Co.

“Interest expense on finance leases” in 2016 was impacted by a €1.4 million adjustment reducing the finance lease obligations.

XML

Income taxes

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Income taxes

10 Income taxes

Income tax expense

	2017			2016			2015
	(€’000)
Current taxes		(13,814	)		(11,421	)		(9,170	)
Deferred taxes		(1,025	)		(5,029	)		(8,755	)
Total income tax expense		(14,839	)		(16,450	)		(17,925	)

Reconciliation of effective tax rate

A reconciliation between income taxes calculated at the Dutch statutory tax rate of 25% in 2017 (25% in 2016 and 2015) and the actual tax benefit/(expense) with an effective tax rate of 27.5% (30.0% in 2016 and 27.7% in 2015) is as follows:

	2017			2016(i)			2015(i)
	(€’000)
Net income		39,067			38,336			46,680
Income tax expense		14,839			16,450			17,925
Profit before taxation		53,906			54,786			64,605
Income tax using Company’s domestic tax rate		(13,477	)		(13,697	)		(16,151	)
Effect of tax rates in foreign jurisdictions		(99	)		(844	)		(407	)
Change in tax rate and legislation		554			367			548
Non-deductible expenses		(2,496	)		(2,197	)		(2,420	)
Recognition of previously unrecognized tax losses		—			147			734
Prior year adjustments included in current year tax		201			(354	)		211
Other		478			128			(440	)
Income tax expense		(14,839	)		(16,450	)		(17,925	)

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Recognized deferred tax assets/(liabilities)

The movement in recognized deferred tax assets during the year is as follows:

	Property, plant and equipment, and Intangibles			Provision onerous contracts			Other			Tax loss carry- forward			Total
	(€’000)
January 1, 2015		13,428			1,575			3,344			22,912			41,259
Recognized in profit/(loss) for 2015		(858	)		(1,091	)		(1,021	)		(3,553	)		(6,523	)
Recognized in equity		—			—			—			(1,224	)		(1,224	)
Effects of movements in exchange rates		11			—			—			221			232
December 31, 2015		12,581			484			2,323			18,356			33,744
Recognized in profit/(loss) for 2016		(348	)		(484	)		(562	)		(3,071	)		(4,465	)
Recognized in equity		—			—			—			1,835			1,835
Effects of movements in exchange rates		1			—			1			(123	)		(121	)
December 31, 2016		12,234			—			1,762			16,997			30,993
Recognized in profit/(loss) for 2017		(1,119	)		—			334			2,355			1,570
Recognized in equity		—			—			(37	)		205			168
Acquisitions		1,779			—			70			915			2,764
Effects of movements in exchange rates		(10	)		—			(31	)		(89	)		(130	)
December 31, 2017		12,884			—			2,098			20,383			35,365
Offset deferred tax liabilities		(6,045	)		—			(1,608	)		(3,242	)		(10,895	)
Net deferred tax assets/(liabilities)		6,839			—			490			17,141			24,470

The movement in recognized deferred tax liabilities during the year is as follows:

	Property, plant and equipment, and Intangibles			Provision onerous contracts		Other			Tax loss carry- forward		Total
	(€’000)
January 1, 2015		(17,118	)		—		(1,106	)		—		(18,224	)
Recognized in profit/(loss) for 2015		(2,038	)		—		(194	)		—		(2,232	)
Effects of movements in exchange rates		(215	)		—		—			—		(215	)
December 31, 2015		(19,371	)		—		(1,300	)		—		(20,671	)
Recognized in profit/(loss) for 2016		(508	)		—		(56	)		—		(564	)
Effects of movements in exchange rates		984			—		—			—		984
December 31, 2016		(18,895	)		—		(1,356	)		—		(20,251	)
Recognized in profit/(loss) for 2017		(2,900	)		—		305			—		(2,595	)
Acquisitions		(9,569	)		—		—			—		(9,569	)
Effects of movements in exchange rates		184			—		—			—		184
December 31, 2017		(31,180	)		—		(1,051	)		—		(32,231	)
Offset deferred tax assets		6,045			—		1,608			3,242		10,895
Net deferred tax assets/(liabilities)		(25,135	)		—		557			3,242		(21,336	)

The deferred tax assets and liabilities are presented as net amounts per tax jurisdiction as far as the amounts can be offset.

The estimated utilization of carried-forward tax losses in future years is based on management’s forecasts of future profitability by tax jurisdiction.

The following net deferred tax assets have not been recognized:

	2017		2016		2015
	(€’000)
Deductible temporary differences, net		—		—		34
Tax losses		—		—		180
		—		—		214

The accumulated recognized and unrecognized tax losses expire as follows:

	2017		2016		2015
	(€’000)
Within one year		—		—		2,683
Between 1 and 5 years		25,352		3,517		3,490
After 5 years		35,164		28,146		25,817
Unlimited		27,748		47,081		57,721
		88,264		78,744		89,711

XML

Property, plant and equipment

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Property, plant and equipment

11 Property, plant and equipment

	Freehold land and buildings			Infrastructure and equipment			Assets under construction			Total data center assets			Office equipment and other			Total
				(€’000)
Cost:
As at January 1, 2017		176,421			1,315,971			111,803			1,604,195			46,761			1,650,956
Additions		28,712			83,216			160,004			271,932			8,765			280,697
Acquisitions through business combinations		5,440			11,272			—			16,712			109			16,821
Exchange differences		(1	)		(11,181	)		(1,020	)		(12,202	)		(510	)		(12,712	)
Disposals		—			(2,045	)		—			(2,045	)		(60	)		(2,105	)
Transfers		17,143			137,207			(154,350	)		—			—			—
As at December 31, 2017		227,715			1,534,440			116,437			1,878,592			55,065			1,933,657
Accumulated depreciation and impairment:
As at January 1, 2017		(16,237	)		(452,054	)		—			(468,291	)		(26,634	)		(494,925	)
Depreciation		(4,861	)		(91,912	)		—			(96,773	)		(6,812	)		(103,585	)
Exchange differences		—			5,050			—			5,050			333			5,383
Disposals		—			1,881			—			1,881			60			1,941
As at December 31, 2017		(21,098	)		(537,035	)		—			(558,133	)		(33,053	)		(591,186	)
Carrying amount as at December 31, 2017		206,617			997,405			116,437			1,320,459			22,012			1,342,471
Cost:
As at January 1, 2016		174,935			1,127,883			77,664			1,380,482			38,219			1,418,701
Additions		—			64,369			184,603			248,972			9,274			258,246
Exchange differences		6			(17,010	)		(2,454	)		(19,458	)		(501	)		(19,959	)
Disposals		—			(5,801	)		—			(5,801	)		(231	)		(6,032	)
Transfers		1,480			146,530			(148,010	)		—			—			—
As at December 31, 2016		176,421			1,315,971			111,803			1,604,195			46,761			1,650,956
Accumulated depreciation and impairment:
As at January 1, 2016		(12,652	)		(385,095	)		—			(397,747	)		(21,882	)		(419,629	)
Depreciation		(3,584	)		(78,680	)		—			(82,264	)		(5,302	)		(87,566	)
Exchange differences		(1	)		5,920			—			5,919			319			6,238
Disposals		—			5,801			—			5,801			231			6,032
As at December 31, 2016		(16,237	)		(452,054	)		—			(468,291	)		(26,634	)		(494,925	)
Carrying amount as at December 31, 2016		160,184			863,917			111,803			1,135,904			20,127			1,156,031
Cost:
As at January 1, 2015		168,505			962,405			74,758			1,205,668			29,951			1,235,619
Additions		6,437			13,113			140,637			160,187			8,404			168,591
Exchange differences		(7	)		14,889			966			15,848			537			16,385
Disposals					(1,221	)		—			(1,221	)		(673	)		(1,894	)
Transfers		—			138,697			(138,697	)		—			—			—
As at December 31, 2015		174,935			1,127,883			77,664			1,380,482			38,219			1,418,701
Accumulated depreciation and impairment:
As at January 1, 2015		(9,270	)		(313,282	)		—			(322,552	)		(17,883	)		(340,435	)
Depreciation		(3,382	)		(67,561	)		—			(70,943	)		(4,333	)		(75,276	)
Exchange differences		—			(5,332	)		—			(5,332	)		(321	)		(5,653	)
Disposals		—			1,080			—			1,080			655			1,735
As at December 31, 2015		(12,652	)		(385,095	)		—			(397,747	)		(21,882	)		(419,629	)
Carrying amount as at December 31, 2015		162,283			742,788			77,664			982,735			16,337			999,072

In December 2017, the Group completed a transaction to purchase approximately 22,000 sqm of land in close proximity to the AMS8 datacenter. As at 31 December 2017, the carrying value of the land amounted to €14.8 million .

In October 2017, the Group completed a transaction to purchase a parcel of land in Frankfurt, Germany. As at December 31, 2017, the carrying value of the land amounted to €10.7 million .

On September 29, 2015, the Group entered into a contract to lease the properties related to the AMS8 data center. The lease, which covers land and building, commenced during the third quarter of 2016. The land component has been treated as an operating lease, the building as a financial lease. As at December 31, 2017, the carrying value of the building amounted to €16.8 million.

In December 2012, the Group exercised its option to purchase the PAR7 data center land. The actual legal transaction will become effective in 2019. As a result of this modification, the lease is reported as a financial lease. Per December 31, 2017, the carrying amount of the land amounted to €20.9 million.

As at December 31, 2017, the carrying value of freehold land included in the category “Freehold land and buildings” amounted to €104.6 million (2016: €76.9 million; 2015: €76.9 million).

Depreciation of property, plant and equipment is disclosed as general and administrative cost in the consolidated statement of income.

At December 31, 2017, properties with a carrying value of €102.9 million (2016: €90.2 million; 2015: €71.8 million) were subject to a registered debenture to secure mortgages (see Note 20). At 31 December 2017, properties with a carrying value of €50.2 million (2016: €51.3 million and 2015: €33.9 million) were subject to a finance lease agreement (see Note 20).

Capitalized interest relating to borrowing costs for 2017 amounted to €3.1 million (2016: €3.4 million; 2015: €2.6 million). The cash effect of the interest capitalized for 2017 amounted to €3.9 million, which is presented in the Statement of Cash Flows under “Purchase of property, plant and equipment” (2016: €2.2 million; 2015: €3.6 million).

XML

Intangible assets and goodwill

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Intangible assets and goodwill

12 Intangible assets and goodwill

	Power grid rights			Software			Goodwill		Customer portfolio			Other			Total
	(€’000)
Cost:
As at January 1, 2017		18,582			21,519			—		—			2,165			42,266
Additions		3,466			5,326			—		—			—			8,792
Acquisitions through business combinations		—			—			38,900		28,005			—			66,905
Exchange differences		(228	)		(35	)		—		—			—			(263	)
Disposals		—			—			—		—			—			—
As at December 31, 2017		21,820			26,810			38,900		28,005			2,165			117,700
Accumulated amortization and impairment:
As at January 1, 2017		(2,232	)		(9,816	)		—		—			(1,524	)		(13,572	)
Amortization		(773	)		(2,619	)		—		(1,167	)		(108	)		(4,667	)
Exchange differences		—			32			—		—			—			32
Disposals		—			—			—		—			—			—
As at December 31, 2017		(3,005	)		(12,403	)		—		(1,167	)		(1,632	)		(18,207	)
Carrying amount as at December 31, 2017		18,815			14,407			38,900		26,838			533			99,493
Cost:
As at January 1, 2016		16,091			16,322			—		—			2,165			34,578
Additions		3,647			5,282			—		—			—			8,929
Exchange differences		(1,156	)		(85	)		—		—			—			(1,241	)
Disposals		—			—			—		—			—			—
As at December 31, 2016		18,582			21,519			—		—			2,165			42,266
Accumulated amortization and impairment:
As at January 1, 2016		(1,688	)		(8,285	)		—		—			(1,411	)		(11,384	)
Amortization		(544	)		(1,612	)		—		—			(113	)		(2,269	)
Exchange differences		—			81			—		—			—			81
Disposals		—			—			—		—			—			—
As at December 31, 2016		(2,232	)		(9,816	)		—		—			(1,524	)		(13,572	)
Carrying amount as at December 31, 2016		16,350			11,703			—		—			641			28,694
Cost:
As at January 1, 2015		12,833			13,039			—		—			2,165			28,037
Additions		2,792			3,733			—		—			—			6,525
Exchange differences		466			43			—		—			—			509
Disposals		—			(493	)		—		—			—			(493	)
As at December 31, 2015		16,091			16,322			—		—			2,165			34,578
Accumulated amortization and impairment:
As at January 1, 2015		(1,297	)		(6,447	)		—		—			(1,297	)		(9,041	)
Amortization		(391	)		(2,290	)		—		—			(114	)		(2,795	)
Exchange differences		—			(41	)		—		—			—			(41	)
Disposals		—			493			—		—			—			493
As at December 31, 2015		(1,688	)		(8,285	)		—		—			(1,411	)		(11,384	)
Carrying amount as at December 31, 2015		14,403			8,037			—		—			754			23,194

Amortization of intangible assets is disclosed as general and administrative cost in the consolidated income statement.

Impairment test on goodwill

The goodwill addition during the year relates to the acquisition of Interxion Science Park in February 2017 (see note 23 – Business Combinations). This business is being integrated in the Dutch operating company and is as such considered part of the Dutch cash generating unit (CGU). As such, the annual impairment test on acquisition goodwill is carried out on this CGU in October of each year.

The recoverable amount of the Dutch CGU was based on value in use, estimated using discounted cash flows.

The key assumptions used in the estimation of the recoverable amount are set out below. The values assigned to the key assumptions represent management’s assessment of future trends in the relevant industries and have been based on historical data from both external and internal sources.

Percentages	2017			2016		2015
Discount rate (pre-tax)		8.2	%		n/a		n/a
Terminal value growth rate		1.1	%		n/a		n/a
Budgeted Adjusted EBITDA growth rate throughout the forecast		0.0	%		n/a		n/a

The discount rate was a post-tax measure estimated based on the historical industry average weighted-average cost of capital, with a possible debt leveraging of 20% at a market interest rate of 3.8%.

The cash flow projections included specific estimates for 2018 and a terminal growth rate thereafter. The terminal growth rate was determined based on management’s estimate.

The budgeted Adjusted EBITDA for 2018 and in steady state was based on expectations of future outcomes taking into account past experience.

XML

Other investments

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Other investments

13 Other investments

The other investments represent a USD 4.5 million convertible loan given by Interxion Participation 1 B.V. to Icolo Ltd, of which USD 4.0 million was disbursed as at December 31, 2017. Interxion has the option to convert the loan into equity on the maturity date or upon the occurrence of an enforcement event. As at December 31, 2017 the fair value of the conversion option is deemed nil.

XML

Trade and other (non-) current assets

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Trade and other (non-) current assets

14 Trade and other (non-) current assets

	2017		2016		2015
	(€’000)
Non-current
Data-center-related prepaid expenses		2,708		3,507		2,834
Rental and other supplier deposits		3,736		3,056		2,929
Deferred setup cost		2,806		1,502		—
Deferred financing costs		—		142		422
Deferred rent related stamp duties		895		379		501
Collaterized cash		3,529		3,328		4,466
		13,674		11,914		11,152

	2017		2016		2015
	(€’000)
Current
Trade receivables – net (Note 21)		113,518		91,451		79,128
Taxes receivable		12,415		5,416		5,716
Accrued revenue		36,575		34,560		39,442
Prepaid expenses and other current assets		17,278		16,394		17,650
		179,786		147,821		141,936

Accrued revenue relates to service-fee holidays provided in relation to our long-term customer contracts. As at December 31, 2017, €18.7 million of the accrued revenue balance will not be realized within 12 months.

Prepaid expenses and other current assets principally comprise accrued income, prepaid insurances, rental and other related operational data center and construction-related prepayments.

As at December 31, 2017, other current and non-current assets include €4.1 million cash held as collateral to support the issuance of bank guarantees on behalf of a number of subsidiary companies (2016: €3.7 million; 2015: €4.9 million). Since 2016, the cash held as collateral is presented as other current and non-current assets. Comparative figures for 2015 have been adjusted accordingly.

XML

Cash and cash equivalents and short-term investments

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Cash and cash equivalents and short-term investments

15 Cash and cash equivalents and short-term investments

Cash and cash equivalents are at free disposal of the Company. Since 2016, the cash held as collateral is presented as other current and non-current assets.

XML

Shareholders' equity

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Shareholders' equity

16 Shareholders’ equity

Share capital and share premium

	Ordinary shares
	2017		2016		2015
	(In thousands of shares)
On issue at 1 January		70,603		69,919		69,317
Issue/conversion of shares		812		684		602
On issue at 31 December		71,415		70,603		69,919

On January 28, 2011, the Company issued 16,250 thousand new shares (post reverse stock split) at the New York Stock Exchange under the ticker symbol INXN. On completion of the offering, the Company did a reverse stock split 5:1, which resulted in nominal value of €0.10 per ordinary shares. The 34,808 thousand Preferred Shares were converted into ordinary shares and the Liquidation Price of €1.00 (post reverse stock split) per Preferred A Share was either paid out in cash or converted in ordinary shares (3.3 million ordinary shares). In 2017, a total of approximately 0.8 million (2016: 0.5 million, 2015: 0.4 million) options were exercised and restricted and performance shares were vested.

At December 31, 2017, 2016 and 2015, the authorized share capital comprised 200,000,000 ordinary shares at par value of €0.10. All issued shares are fully paid.

Foreign currency translation reserve

The foreign currency translation reserve comprises of all foreign exchange differences arising from the translation of the financial statements of foreign operations as well as from the translation of intergroup balances with a permanent nature.

XML

Earnings per share

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Earnings per share

17 Earnings per share

Profit attributable to ordinary shareholders

	2017		2016(i)		2015(i)
	(€’000)
Profit attributable to ordinary shareholders		39,067		38,336		46,680

Basic earnings per share

The calculation of basic earnings per share at December 31, 2017, was based on the profit attributable to ordinary shareholders and a weighted average number of ordinary shares outstanding during the year ended December 31, 2017, of 71,089,000 (for the years; 2016: 70,349,000 and 2015: 69,579,000). Profit is attributable to ordinary shareholders on an equal basis.

Diluted earnings per share

The calculation of diluted earnings per share at December 31, 2017, was based on the profit attributable to ordinary shareholders and a weighted average number of ordinary shares and the impact of options, restricted share and performance shares outstanding during the year ended December 31, 2017, of 71,521,000 (for the years; 2016: 71,213,000 and 2015: 70,474,000).

Weighted average number of ordinary shares

	2017		2016(i)		2015(i)
Weighted average number of ordinary shares at 31 December		71,089		70,349		69,579
Dilution effect of share options, restricted and performance shares on issue		432		864		895
Weighted average number of ordinary shares (diluted) at 31 December		71,521		71,213		70,474

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade payables and other liabilities

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Trade payables and other liabilities

18 Trade payables and other liabilities

	2017		2016		2015
	(€’000)
Non-current
Deferred revenue		7,557		6,282		5,272
Other non-current liabilities		7,523		5,436		6,777
		15,080		11,718		12,049
Current
Trade payables		47,489		23,076		25,045
Tax and social security		9,357		6,528		9,439
Customer deposits		20,878		20,671		21,208
Deferred revenue		73,262		63,974		60,700
Accrued expenses		78,770		57,043		46,103
Other current liabilities		122		107		134
		229,878		171,399		162,629

Trade payables include €28.8 million (2016: €10.6 million; 2015: €15.0 million) accounts payable in respect of purchases of property, plant and equipment.

Accrued expenses are analyzed as follows:

	2017		2016		2015
	(€’000)
Data-center-related costs		36,805		18,752		11,788
Personnel and related costs		13,273		12,261		11,709
Professional services		2,486		1,871		2,246
Customer implementation and related costs		4,492		3,081		3,346
Financing-related costs		17,909		17,498		13,454
Other		3,805		3580		3,560
		78,770		57,043		46,103

As at December 31, 2017, the accrued financing-related costs principally relate to interest expenses on the Senior Secured Notes.

XML

Provision for onerous lease contracts

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Provision for onerous lease contracts

19 Provision for onerous lease contracts

The provision for onerous lease contracts related to two unused data center sites in Germany. These lease contracts terminated in 2016.

The provision was calculated based on the discounted future contracted payments net of any sublease revenues.

	2017		2016			2015
	(€’000)
As at 1 January		—		1,517			4,934
Increase/(decrease) in provision		—		—			(184	)
Unwinding of discount		—		16			115
Utilization of provision		—		(1,533	)		(3,348	)
As at 31 December		—		—			1,517
Non-current		—		—			—
Current		—		—			1,517
		—		—			1,517

Discounted estimated future losses were calculated using a discount rate based on the five-year euro-area government benchmark bond yield prevailing at the balance sheet date.

XML

Borrowings

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Borrowings

20 Borrowings

	2017		2016		2015
	(€’000)
Non-current
Senior Secured Notes 6.0%, due 2020		628,141		629,327		475,503
Mortgages		45,386		43,508		40,727
Finance lease liabilities		50,525		51,140		34,582
		724,052		723,975		550,812
Current
Mortgages		8,254		10,904		3,346
Finance lease liabilities		602		578		—
2017 Senior Secured Revolving Facility		99,904		—		—
Other loans		—		—		1,605
		108,760		11,482		4,951
Total borrowings		832,812		735,457		555,763

The carrying amounts of the Group’s borrowings are principally denominated in euros. The face value of the Senior Secured Notes as at December 31, 2017 was €625.0 million (2016: €625.0 million and 2015: €475.0 million).

The face value of the mortgages amounted to €54.3 million as at December 31, 2017 (2016: €55.2 million and 2014: €44.6 million).

Senior Secured Notes and bank borrowings

Mortgages

In January 2013, the Group completed two mortgage financings totaling €10.0 million. The loans are secured by mortgages on the PAR3 land, owned by Interxion Real Estate II Sarl, and the PAR5 land, owned by Interxion Real Estate III Sarl, and pledges on the lease agreements, and are guaranteed by Interxion France SAS. The principal amounts on the two loans are to be repaid in quarterly instalments in an aggregate amount of €167,000 commencing on April 18, 2013. The mortgages have a maturity of 15 years and have a variable interest rate based on EURIBOR plus an individual margin ranging from 240 to 280 basis points. The interest rates have been fixed for 75% of the principal outstanding amount for a period of ten years.

In June 2013, the Group completed a €6.0 million mortgage financing. The loan is secured by a mortgage on the AMS3 property, owned by Interxion Real Estate V B.V., and a pledge on the lease agreement. The principal is to be repaid in annual instalments of €400,000 commencing May 1, 2014, and a final repayment of €4,400,000 due on May 1, 2018. The mortgage has a variable interest rate based on EURIBOR plus 275 basis points. The loan contains a minimum of 1.1 debt service capacity covenant ratio based on operations of Interxion Real Estate V B.V.

In April 2014, the Group completed a €9.2 million financing. The facility is secured by a mortgage on the data center property in Zaventhem (Belgium), which was acquired by Interxion Real Estate IX N.V. on January 9, 2014, and a pledge on the lease agreement, and is guaranteed by Interxion Real Estate Holding B.V. The facility has a maturity of 15 years and has a variable interest rate based on EURIBOR plus 200 basis points. The principal amount is to be repaid in 59 quarterly instalments of €153,550, of which the first quarterly instalment was paid on July 31, 2014, and a final repayment is due on April 30, 2029.

On October 13, 2015, the Group completed a €15.0 million mortgage financing. The facility is secured by a mortgage on the real estate property in Germany, which is owned by Interxion Real Estate I B.V. and a pledge on the lease agreement. The facility has a maturity of five years and has a variable interest rate based on EURIBOR plus 225 basis points. The principal amount is to be repaid in four annual instalments of €1,000,000 of which the first annual instalment was paid on September 30, 2016, and a final repayment of €11,000,000 which is due on September 30, 2020.

On April 8, 2016, the Group completed a €14.6 million financing. The facility is secured by a mortgage on the data center property in Vienna (Austria), acquired by Interxion Real Estate VII GmbH in January 2015, and a pledge on the lease agreement, and is guaranteed by Interxion Real Estate Holding B.V. The facility has a maturity of 14 years and nine months, and has a variable interest rate based on EURIBOR plus 195 basis points. The principal amount is due to be repaid in 177 monthly instalments, increasing from €76,000 to €91,750. The first monthly instalment of €76,000 was paid on April 30, 2016, and a final repayment of €91,750 is due on December 31, 2030.

On December 1, 2017, we renewed a €10.0 million mortgage financing entered into in 2012, which was secured by mortgages on the AMS6 property, owned by Interxion Real Estate IV B.V. The principal is to be repaid in annual instalments of €667,000 commencing December, 2018, and a final repayment of €7,332,000 due on December 31, 2022. The mortgage has a variable interest rate based on higher of 0% and EURIBOR plus 225 basis points.

These mortgages do not conflict with the restrictions of the Indenture and the Revolving Facilities.

Senior Secured Notes due 2020

On July 3, 2013, the Company issued an aggregate principal amount of €325.0 million 6.00% Senior Secured Notes due 2020 (the “Senior Secured Notes due 2020”).

The net proceeds of the offering were used to purchase all the €260.0 million Senior Secured Notes due 2017, which were tendered in the offer for those notes and to redeem the €260.0 million Senior Secured Notes due 2017 which remained outstanding following the expiration and settlement of the tender offer and consent solicitation, to pay all related fees, expenses and premiums and for other general corporate purposes.

The €325.0 million Senior Secured Notes due 2020 are governed by an indenture dated July 3, 2013, between the Company, as issuer, and The Bank of New York Mellon, London Branch as Trustee. The indenture contains customary restrictive covenants, including but not limited to limitations or restrictions on our ability to incur debt, grant liens, make restricted payments and sell assets. The restrictive covenants are subject to customary exceptions and are governed by a consolidated fixed charge ratio to exceed 2.00 and a consolidated senior leverage ratio (net of cash and cash equivalents) not to exceed 4.00.

The obligations under the €325.0 million Senior Secured Notes due 2020 are guaranteed by certain of the Company’s subsidiaries.

On April 29, 2014, the Company completed the issuance of €150.0 million aggregate principal amount of its 6.00% Senior Secured Notes due 2020 (the “Additional Notes”). The net proceeds of the offering amount to €157.9 million, net of offering fees and expenses of €2.3 million. The net proceeds reflect the issuance of the Additional notes at a premium of 106.75 and net of offering fees and expenses. The Additional Notes, which are guaranteed by certain subsidiaries of the Company, were issued under the indenture pursuant to which, on July 3, 2013, the Company issued €325.0 million in aggregate principal amount of 6.00% Senior Secured Notes due 2020.

On April 14, 2016, the Company completed the issuance of an additional €150.0 million aggregate principal amount of its 6.00% Senior Secured Notes due 2020 (together with the notes issued on April 29, 2014, the “Additional Notes”). The net proceeds of the offering amounted to approximately €155.3 million, net of estimated offering fees and expenses of €2.1 million. The net proceeds contain the nominal value of the Additional Notes increased with a premium at 104.50. The Additional Notes, which are guaranteed by certain subsidiaries of the Company, were issued under the indenture dated July 3, 2013, pursuant to which the Company has previously issued €475.0 million in aggregate principal amount of 6.00% Senior Secured Notes due 2020.

The Company may redeem all or part of the €625.0 million Senior Secured Notes due 2020. The Company has the following redemption rights:

Optional Redemption

At any time after July 15, 2016 and before maturity, upon not less than ten and not more than 60 days’ notice, the Company may redeem all or part of the Senior Secured Notes. These redemptions will be in amounts of €100,000 or integral multiples of €1,000 in excess thereof at the following redemption prices (expressed as percentages of their principal amount at maturity), plus accrued and unpaid interest, if any, to the redemption date, if redeemed during the 12-month period commencing on July 15 of the years set out below.

Year	Redemption Price
2017		103.000	%
2018		101.500	%
2019 and thereafter		100.000	%

Change of Control

If, at any time, directly or indirectly, a beneficial owner becomes owner of more than 50% of the total voting power of the voting stock of the Company, a change of control occurs. The Company shall then make an offer to each holder of the Senior Secured Notes to purchase each holder’s Senior Secured Notes, in whole or in part, in a principal amount of €100,000, or in integral multiples of €1,000, in excess thereof at a purchase price in cash equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase.

Revolving Facility Agreements

2013 Super Senior Revolving Facility Agreement

On June 17, 2013, the Company entered into the 2013 Super Senior Revolving Facility Agreement.

On July 3, 2013, in connection with the issuance of the €325.0 million Senior Secured Notes due 2020, all conditions precedent to the utilization of the 2013 Super Senior Revolving Facility Agreement were satisfied. On July 31, 2017, the Company extended the maturity of the 2013 Super Senior Revolving Facility from July 3, 2018 to December 31, 2018.

As at December 31, 2017, the 2013 Super Senior Revolving Facility was undrawn.

2017 Senior Secured Revolving Facility Agreement

On March 9, 2017, the Company entered into the 2017 Senior Secured Revolving Facility Agreement.

The 2017 Senior Secured Revolving Facility had an initial maturity date of 12 months from the date of the 2017 Senior Secured Revolving Facility with the Company having the option to extend the maturity date by a further six-month period in accordance with the terms therein. The 2017 Senior Secured Revolving Facility initially bears interest at a rate per annum equal to EURIBOR (subject to a zero percent floor) plus a margin of 2.25% per annum, subject to a margin ratchet, pursuant to which the margin may be increased to a maximum of 3.25% per annum if the 2017 Senior Secured Revolving Facility is extended up to an additional six months after its initial maturity date.

On July 28, 2017, the Company amended the terms of the 2017 Senior Secured Revolving Facility Agreement to increase the amount available under the facility to €100.0 million and to add a second extension option to enable extension of the maturity of the 2017 Senior Secured Revolving Facility to December 31, 2018. The Company elected, as of March 1, 2018, to extend the maturity of the 2017 Senior Secured Revolving Facility to September 9, 2018.

As at December 31, 2017, the 2017 Senior Secured Revolving Facility was fully drawn.

Covenants regarding Revolving Facility Agreements

The Revolving Facility Agreements also require the Company to maintain a specified financial ratio. The restrictive covenants are subject to customary exceptions including, in relation to the incurrence of subordinated debt, a consolidated fixed charge ratio (calculated as a ratio of Adjusted EBITDA to consolidated interest expense), to exceed 2.00 to 1.00 on a pro forma basis for the four full fiscal quarters (taken as one period) for which financial statements are available immediately preceding the incurrence of such debt and, if such debt is senior debt, a consolidated senior leverage ratio (calculated as a ratio of outstanding senior debt net of cash and cash equivalents of the Company and its restricted subsidiaries (on a consolidated basis) to pro forma Adjusted EBITDA), to be less than 4.00 to 1.00 on a pro forma basis for the four full fiscal quarters (taken as one period) for which financial statements are available immediately preceding the incurrence of such debt.

The Revolving Facility Agreements also include a leverage ratio financial covenant (tested on a quarterly basis) that requires total net debt (calculated as a ratio to pro forma EBITDA) not to exceed a leverage ratio of 4.75 to 1.00 and stepping down to 4.00 to 1.00 for each applicable test date after (but not including) June 30, 2018. In addition, the Company must ensure, under the Revolving Facility Agreements, that the guarantors represent a certain percentage of Adjusted EBITDA, and a certain percentage of the consolidated net assets of the Group as a whole. Our ability to meet these covenants may be affected by events beyond our control and, as a result, we cannot assure you that we will be able to meet the covenants. In the event of a default under the Revolving Facility Agreements, the lenders could terminate their commitments and declare all amounts owed to them to be due and payable. Borrowings under other debt instruments that contain cross acceleration or cross default provisions, including the Senior Secured Notes, may as a result also be accelerated and become due and payable.

On February 20, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility to waive, from the date of such consent becoming effective and up to, and including, May 1, 2018, the undertaking requiring certain material subsidiaries of the Company to accede to the 2013 Super Senior Revolving Facility Agreement as additional guarantors and, for the same period, to reduce the guarantor coverage threshold as a percentage of the group’s consolidated adjusted EBITDA (as more fully set out in the 2013 Super Senior Revolving Facility Agreement) from 85% to 80%. On April 19, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018

On February 19, 2018 the Company also received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the date by which certain subsidiaries of the Company are required to accede to the 2017 Senior Secured Revolving Facility Agreement as guarantors to April 30, 2018. On April 20, 2018, the Company received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018.

The Company also received, on March 1, 2018, the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement in relation to entering into the 2018 Subordinated Revolving Facility Agreement.

Interxion remained in full compliance with all its covenants. In addition, the Company does not anticipate, in the next twelve months, any breach or failure that would negatively impact its ability to borrow funds under the Revolving Facility Agreements.

Change of control or sale of assets

If, there is a sale of all or substantially all the assets of the Group whether in a single transaction or a series of related transactions, or a change of control that any beneficial owner gains control of the Company, then a lender under each of the Revolving Facility Agreements shall not be obliged to fund a loan to the Company.

In addition, if within 30 days of the Company notifying the applicable agent under the relevant Revolving Facility Agreement of a change of control or sale of assets as described above, a lender wishes to cancel its commitment under the applicable Revolving Facility Agreement as a result of that event, such lender’s commitments will be immediately cancelled and its participation in all outstanding loans shall, together with the accrued and unpaid interest and all other amounts accrued and outstanding under the agreement, become due and payable within 10 business days of the date on which the relevant lender notifies the applicable agent thereunder, unless the Company replaces such lender within such 10 business day period.

Reconciliation to cash flow statement

The reconciliation of movements of liabilities to cash flows arising from financing activities is set out below:

	Senior Secured Notes			Mortgages			Finance lease liabilities			Revolving Facilities			Share capital		Share premium		Foreign currency translation reserve			Hedging Reserve			Accumulated profit/(deficit)		Total
	(€’000)
Balance as at 1 January 2017		629,327			54,412			51,718			—			7,060		519,604		9,988			(243	)		12,360		1,284,226
Changes from financing cash flows
Proceeds from exercised options		—			—			—			—			55		6,914		—			—			—		6,969
Proceeds from mortgages		—			9,950			—			—			—		—		—			—			—		9,950
Repayment of mortgages		—			(10,848	)		—			—			—		—		—			—			—		(10,848	)
Proceeds from Revolving Facilities		—			—			—			129,521			—		—		—			—			—		129,521
Repayment of Revolving Facilities		—			—			—			(30,000	)		—		—		—			—			—		(30,000	)
Finance lease obligation		—			—			(995	)		—			—		—		—			—			—		(995	)
Total changes from financing cash flows		—			(898	)		(995	)		99,521			55		6,914		—			—			—		104,597
Other changes
Liability-related
Amortized borrowing costs		(1,186	)		126			—			383			—		—		—			—			—		(677	)
Interest expense		—			—			404			—			—		—		—			—			—		404
Total liability-related		(1,186	)		126			404			383			—		—		—			—			—		(273	)
Total equity-related other changes		—			—			—			—			26		5,724		(7,040	)		74			42,206		40,990
Balance as at 31 December 2017		628,141			53,640			51,127			99,904			7,141		532,242		2,948			(169	)		54,566		1,429,540

Maturity profile

The maturity profile of the gross amounts of Senior Secured Notes, the 2013 Super Senior Revolving Facility, the 2017 Senior Secured Revolving Facility and Mortgages are set out below:

	2017		2016		2015
	(€’000)
Within one year		104,400		7,332		—
Between 1 and 5 years		648,000		643,800		503,199
Over 5 years		26,916		29,107		16,447
		779,316		680,239		519,646

The Group has the following undrawn bank borrowing facilities:

	2017		2016		2015
	(€’000)
Expiring within one year		100,000		—		—
Expiring between 1 and 5 years		—		100,000		100,000
		100,000		100,000		100,000

Covenants

The Revolving Facility Agreements contain various covenants that restrict, among other things and subject to certain exceptions, the ability of the Company and its subsidiaries to:

• create certain liens;

• incur debt and/or guarantees;

• enter into transactions other than on an arm’s-length basis;

• pay dividends or make certain distributions or payments;

• engage, in relation to the Company, in any business activity or own assets or incur liabilities not authorized by the Revolving Facility Agreements;

• sell certain kinds of assets;

• enter into any sale and leaseback transactions;

• make certain investments or other types of restricted payments;

• substantially change the nature of the Company or the Group’s business;

• designate unrestricted subsidiaries; and

• effect mergers, consolidations or sale of assets.

Our Revolving Facility Agreements also require us to maintain a specified financial ratio. The restrictive covenants are subject to customary exceptions including, in relation to the incurrence of subordinated debt, a consolidated fixed charge ratio (calculated as a ratio of Adjusted EBITDA to consolidated interest expense) to exceed 2.00 to 1.00 on a pro forma basis for the four full fiscal quarters (taken as one period) for which financial statements are available immediately preceding the incurrence of such debt and, if such debt is senior debt, a consolidated senior leverage ratio (calculated as a ratio of outstanding senior debt of the Company and its restricted subsidiaries (on a consolidated basis) to pro forma Adjusted EBITDA) to be less than 4.00 to 1.00 on a pro forma basis for the four full fiscal quarters (taken as one period) for which financial statements are available immediately preceding the incurrence of such debt.

The Revolving Facility Agreements also include a leverage ratio financial covenant (tested on a quarterly basis), which requires total net debt (calculated as a ratio to pro forma Adjusted EBITDA) not to exceed a leverage ratio of 4.75 to 1.00 and stepping down to 4.00 to 1.00 for each applicable test date after (but not including) June 30, 2018. In addition, the Company must ensure, under the Revolving Facility Agreements, that the guarantors represent a certain percentage of Adjusted EBITDA of the Group as a whole and a certain percentage of the consolidated net assets of the Group as a whole. Our ability to meet these covenants may be affected by events beyond our control and, as a result, we cannot assure you that we will be able to meet the covenants. In the event of a continuing default under our Revolving Facilities Agreements, the lenders could terminate their commitments and declare all amounts owed to them to be due and payable. Borrowings under other debt instruments that contain cross acceleration or cross default provisions, including the Senior Secured Notes, may as a result also be accelerated and become due and payable. The breach of any of these covenants by the Company or the failure by the Company to maintain its leverage ratio could result in a default under the Revolving Facility Agreements.

On February 20, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility to waive, from the date of such consent becoming effective and up to, and including, May 1, 2018, the undertaking requiring certain material subsidiaries of the Company to accede to the 2013 Super Senior Revolving Facility Agreement as additional guarantors and, for the same period, to reduce the guarantor coverage threshold as a percentage of the group’s consolidated adjusted EBITDA (as more fully set out in the 2013 Super Senior Revolving Facility Agreement) from 85% to 80%. On April 19, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018

On February 19, 2018 the Company also received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the date by which certain subsidiaries of the Company are required to accede to the 2017 Senior Secured Revolving Facility Agreement as guarantors to April 30, 2018. On April 20, 2018, the Company received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018.

The Company also received, on March 1, 2018, the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement in relation to entering into the 2018 Subordinated Revolving Facility Agreement. Interxion remained in full compliance with all its covenants. In addition, the Company does not anticipate, in the next twelve months, any breach or failure that would negatively impact its ability to borrow funds under the Revolving Facility Agreements.

The Senior Secured Notes due 2020 Indenture contains covenants for the benefit of the holders of the Notes that restrict, among other things and subject to certain exceptions, the ability of the Company and its subsidiaries to:

• incur debt;

• enter into certain transactions with, or for the benefit of, an affiliate;

• create or incur certain liens;

• incur changes in control;

• pay dividends or make certain distributions or payments;

• engage in any business activity not authorized by the Indenture;

• sell certain kinds of assets;

• impair any security interest on the assets serving as collateral for the Notes;

• enter into any sale and leaseback transaction;

• make certain investments or other types of restricted payments;

• designate unrestricted subsidiaries;

• effect mergers, consolidations or sale of assets; and

• guarantee certain debt.

The restrictive covenants are subject to customary exceptions and are governed by a consolidated fixed-charge ratio to exceed 2.00 and a consolidated senior leverage ratio (net of cash and cash equivalents) not to exceed 4.00. The breach of any of these covenants by the Company could result in a default under the Indenture. Interxion remained in full compliance with all its covenants. The Company’s consolidated fixed charge ratio stood at 4.92 (2016: 4.51; 2015: 5.14) and both the net debt ratio and the leverage ratio financial covenant stood at 3.60 (2016: 3.26; 2015: 2.94).

Financial lease liabilities

Financial lease liabilities relate to the acquisition of property, plant and equipment with the following payment schedule:

	2017		2016		2015
	(€’000)
Gross lease liabilities:
Within one year		4,389		4,346		2,990
Between 1 and 5 years		29,625		31,904		30,230
More than 5 years		36,478		39,144		20,024
		70,492		75,394		53,244
Interest
Within one year		3,693		3,898		3,374
Between 1 and 5 years		10,218		11,897		11,129
More than 5 years		5,454		7,881		4,159
		19,36519		23,676		18,662
Present value of minimum lease payments
Within one year		696		448		(384	)
Between 1 and 5 years		19,407		20,007		19,101
More than 5 years		31,024		31,263		15,865
		51,127		51,718		34,582

In September 2015, the Group entered into a contract to lease the properties related to the AMS8 data center. The lease, which covers land and building, commenced during the third quarter of 2016. The land component has been treated as an operating lease, the building as a finance lease. As at December 31, 2017, the carrying value of the building amounted to €16.8 million.

In August 2014, the Group exercised its option to purchase the AMS7 data center land and building. The actual legal transaction will become effective in 2023. As a result of this modification, in accordance with IAS17, as of 22 August 2014, the lease, which was previously reported as an operating lease is reported as a financial lease. The carrying amount of the land amounts to €5.8 million, the carrying value of the building amounted to €6.7 million. The actual legal transfer of ownership will become effective in 2023.

In December 2012, the Group exercised its option to purchase the PAR7 data center land. The actual legal transaction will come into effect in 2019. As a result of this modification, in accordance with IAS17, as of December 20, 2012, the lease, which was previously reported as an operating lease is treated as a financial lease. The carrying amount of the land amounts to €20.9 million.

Other loans

Until 2016, the Group had a loan facility with the landlord of one of its unused data center sites in Germany to allow the Group to invest in improvements to the building to meet the requirements of sub-lessees. The loan bore interest at 6% per annum and was repaid in 2016. As at December 31, 2015, the balance of the landlord loan was €1.6 million.

XML

Financial instruments

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Financial instruments

21 Financial instruments

Credit risk

Exposure to credit risk

The carrying amount of financial assets represents the maximum credit exposure. The total balance exposed to credit risk at the reporting date was:

	2017		2016		2015
	(€’000)
Trade receivables		113,518		91,451		79,128
Accrued revenue		36,575		34,560		39,442
Rental and other supplier deposits		3,736		3,056		2,929
Other investments		3,693		1,942		—
Collaterized cash		4,053		3,729		4,868
Cash and cash equivalents		38,484		115,893		53,686
		200,059		250,631		180,053

The Group seeks to minimize the risk related to cash and cash equivalents by holding cash as widely as possible across multiple bank institutions. Term risk is limited to deposits of no more than two weeks. The Group monitors its cash position, including counterparty and term risk, daily.

The Group seeks to minimize the credit risk related to customers by analyzing new customers individually for creditworthiness before it begins to trade. If customers are independently rated, these ratings are used. If there is no independent rating, the credit quality of the customer is analyzed taking its financial position, past experience and other factors into account.

The Group’s largest financial asset balance exposed to credit risk is with a financial institution, one of the Company’s relationships banks, which accounts for approximately 16% of the €200.1 million total balance exposed to credit risk as at December 31, 2017.

The Group’s largest customer balance exposed to credit risk is with a customer, serviced from multiple locations under multiple service contracts, which accounts for approximately 19% of the total balance exposed to credit risk as at December 31, 2017.

The maximum credit exposure on the trade receivables is reduced by the deferred revenue balance of €80.8 million, as presented in Note 18 (2016: €70.3 million and 2015: €66.0 million).

The exposure to credit risk for trade receivables at the reporting date by geographic region was:

	2017		2016		2015
	(€’000)
UK, France, Germany and The Netherlands		88,634		71,099		62,448
Rest of Europe		23,995		19,807		16,246
Corporate		889		545		434
		113,518		91,451		79,128

The aging of trade receivables as at the reporting date was:

	2017				2016				2015
	Gross		Allowance		Gross		Allowance		Gross		Allowance
	(€’000)
Not past due		88,530		—		69,771		—		66,016		—
Past due 0–30 days		9,448		—		12,027		—		7,569		—
Past due 31–120 days		13,111		39		7,329		8		3,589		20
Past due 121 days–1 year		2,295		223		2,358		234		1,797		111
More than 1 year		725		329		324		116		349		61
		114,109		591		91,809		358		79,320		192

The movement in the allowance for impairment in respect of trade receivables during the year was as follows:

	2017			2016			2015
	(€’000)
Balance as at 1 January		358			192			273
Impairment loss recognized		316			285			144
Write-offs		(83	)		(119	)		(225	)
Balance as at 31 December		591			358			192

Based on historic default rates, the Group believes that no impairment allowance is necessary in respect of trade receivables other than those that have been specifically provided for.

Liquidity risk

The following are the contractual maturities of financial liabilities, including interest payments and excluding the impact of netting agreements.

December 31, 2017

	Carrying amount		Contractual cash flows		Less than 1 year		Between 1 - 5 years		More than 5 years
	(€’000)
Financial liabilities
Senior Secured Notes		628,141		737,500		37,500		700,000		—
Finance lease liabilities		51,127		70,492		4,389		29,625		36,478
Mortgages		53,640		59,684		9,380		33,149		17,155
2017 Senior Secured Revolving Facility		100,000		100,000		100,000		—		—
Trade and other payables(1)		145,412		145,412		145,225		26		161
		978,320		1,113,088		296,494		762,800		53,794

December 31, 2016

	Carrying amount		Contractual cash flows		Less than 1 year		Between 1 - 5 years		More than 5 years
	(€’000)
Financial liabilities
Senior Secured Notes		629,327		775,000		37,500		737,500		—
Finance lease liabilities		51,718		75,394		4,346		31,904		39,144
Mortgages		54,412		60,792		12,137		28,980		19,675
Trade and other payables(1)		95,803		95,803		95,624		26		153
	831,260		1,006,989		149,607		798,410		58,972

December 31, 2015

	Carrying amount		Contractual cash flows		Less than 1 year		Between 1 - 5 years		More than 5 years
	(€’000)
Financial liabilities
Senior Secured Notes		475,503		617,500		28,500		589,000		—
Finance lease liabilities		34,582		53,244		2,990		30,230		20,024
Mortgages		44,073		49,748		4,466		34,120		11,162
Other loans		1,605		1,629		1,629		—		—
Trade and other payables(1)		89,743		89,743		89,743		—		—
		645,506		811,864		127,328		653,350		31,186

Notes:—

(1) The carrying amount excludes accrued interest on Senior Secured Notes and mortgages, deferred revenues and rental holidays.

Market risk

Exposure to currency risk

The following significant exchange rates applied during the year:

	Average rate						Report date mid-spot rate
	2017		2016		2015		2017		2016		2015
Euro
GBP 1		1.141		1.220		1.379		1.126		1.167		1.357
CHF 1		0.897		0.918		0.937		0.855		0.931		0.923
DKK 1		0.134		0.134		0.134		0.134		0.135		0.134
SEK 1		0.104		0.106		0.107		0.102		0.104		0.109

Sensitivity analysis

A 10% strengthening of the euro against the following currencies at December 31, would have increased (decreased) equity and profit or loss by approximately the amounts shown below. This analysis assumes that all other variables, in particular interest rates, remained constant and was performed on the same basis for 2016 and 2015.

	Equity			Profit or loss
	(€’000)
December 31, 2017
GBP		(5,148	)		(1,712	)
CHF		(4,755	)		(148	)
DKK		(2,512	)		(246	)
SEK		(1,348	)		(196	)
December 31, 2016
GBP		(3,490	)		(127	)
CHF		(4,990	)		(186	)
DKK		(2,268	)		(211	)
SEK		(1,179	)		38
December 31, 2015
GBP		(3,848	)		(1,290	)
CHF		(4,757	)		(148	)
DKK		(2,042	)		(186	)
SEK		(356	)		(137	)

A 10% weakening of the euro against the above currencies at December 31, would have had the equal, but opposite, effect to the amounts shown above, on the basis that all other variables remained constant.

Interest rate risk

Profile

At the reporting date, the interest rate profile of the Group’s interest-bearing financial instruments was:

	Carrying amount
	2017		2016		2015
	(€’000)
Fixed-rate instruments
Senior Secured Notes		628,141		629,327		475,503
Finance lease liabilities		51,127		51,718		34,582
Mortgages		4,927		5,400		5,870
Other loans		—		—		1,605
	684,195		686,445		517,560
Variable-rate instruments
Mortgages		48,713		49,012		38,203
2017 Senior Secured Revolving Facility		99,904		—		—
		148,617		49,012		38,203
		832,812		735,457		555,763

The mortgages on the PAR3 land, owned by Interxion Real Estate II Sarl, and the PAR5 land, owned by Interxion Real Estate III Sarl have variable interest rates based on EURIBOR plus an individual margin ranging from 240 to 280 basis points. The interest rates have been fixed for 75% of the principal outstanding amount for a period of ten years, which has been reflected in the table above.

Cash flow sensitivity analysis for fixed-rate instruments

The Group does not account for any fixed-rate financial assets and liabilities at fair value through profit and loss, and does not designate derivatives (interest rate swaps) as hedging instruments under a fair value hedge accounting model. A change in interest rates at the end of the reporting period would, therefore, not affect profit or loss.

Cash flow sensitivity analysis for variable rate instruments

A change of 100 basis points in interest rates payable at the reporting date would have increased (decreased) equity and profit or loss by the amounts shown below. This analysis assumes that all other variables, in particular foreign currency rates, remained constant.

	Profit or loss					Equity
	100 bp increase			100 bp decrease		100 bp increase			100 bp decrease
	(€’000)
December 31, 2017
Variable rate instruments		(1,021	)		1,021		(76	)		76
December 31, 2016
Variable rate instruments		(478	)		478		(84	)		84
December 31, 2015
Variable rate instruments		(261	)		261		(91	)		91

Fair values and hierarchy

Fair values versus carrying amounts

As at December 31, 2017, the market price of the 6.00% Senior Secured Notes due 2020 was 103.552 (2016: 105.045 and 2015: 105.780). Using this market price, the fair value of the Senior Secured Notes due 2020 would have been approximately €647.0 million, compared with their nominal value of €625.0 million. As at December 31, 2016, the value of the notes was €657.0 million compared with a nominal value of €625.0 million. As at December 31, 2015 the value of the notes was €502.0 million compared with a nominal value of €475 million.

Until 2014, the Group had a financial asset carried at fair value, its investment in iStreamPlanet Inc. This investment was sold during 2015. In addition, the Group had a cash flow hedge carried at a negative fair value, to hedge the interest rate risk of part of two mortgages.

As at 31 December 2017, the fair value of all mortgages was equal to their carrying amount of €53.6 million. As of 31 December 2017, the fair value of the financial lease liabilities was €54.3 million compared with its carrying amount of €51.1 million.

As at December 31, 2017, the fair value of the conversion option in the convertible loan to Icolo Ltd., was deemed nil.

Fair-value hierarchy

The Company regularly reviews significant unobservable inputs and valuation adjustments. If third-party information, such as broker quotes or pricing services, is used to measure fair values, then the Company assesses the evidence obtained from the third parties to support the conclusion that such valuations meet the requirements of IFRS, including the level in the fair value hierarchy in which such valuations should be classified. Significant valuation issues are reported to the Company’s Audit Committee.

When measuring the fair value of an asset or a liability, the Company uses observable market data as far as possible. Fair values are categorized into different levels in a fair-value hierarchy based on the inputs used in the valuation techniques as follows:

Level 1:	quoted prices (unadjusted) in active markets for identical assets or liabilities;
Level 2:	inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices);
Level 3:	inputs for the asset or liability that are not based on observable market data (unobservable inputs).

If the inputs used to measure the fair-value of an asset or a liability fall into different levels of the fair-value hierarchy, then the fair-value measurement is categorized in its entirety at the same level of the fair-value hierarchy as the lowest level input that is significant to the entire measurement. The Company recognizes transfers between levels of the fair-value hierarchy at the end of the reporting period during which the change has occurred.

The values of the instruments are:    

	Carrying value			Fair value
	(€’000)
				Level 1			Level 2			Level 3
December 31, 2017
Senior secured notes 6.00% due 2020		(628,141	)		(647,000	)		—			—
2017 Senior Secured Revolving Facility		(99,904	)		—			(99,904	)		—
Finance leases		(51,127	)		—			(54,282	)		—
Mortgages		(53,640	)		—			(53,640	)		—
Other investments		3,693			—			3,693			—
Interest rate swap		(255	)		—			(255	)		—
Conversion option		0			—			—			0
December 31, 2016
Senior secured notes 6.00% due 2020		(629,327	)		(657,000	)		—			—
Finance leases		(51,718	)		—			(55,625	)		—
Mortgages		(54,412	)		—			(54,412	)		—
Other investments		1,942			—			1,942			—
Interest rate swap		(367	)		—			(367	)		—
Conversion option		0			—			—			0
December 31, 2015
Senior secured notes 6.00% due 2020		(475,503	)		(502,000	)		—			—
Finance leases		(34,582	)		—			(41,012	)		—
Mortgages		(44,073	)		—			(44,073	)		—
Interest rate swap		(321	)		—			(321	)		—

No changes in levels of hierarchy, or transfers between levels, occurred in the reporting period. Fair values were obtained from quoted market prices in active markets or, where no active market exists, by using valuation techniques. Valuation techniques include discounted cash flow models using inputs as market interest rates and cash flows.

The Level 3 financial asset represents the conversion option embedded in a USD 4.5 million convertible loan (mentioned in the hierarchy table as ‘Other investments’) provided by Interxion Participation 1 B.V, of which USD 4.0 million was disbursed as at December 31, 2017. Interxion has the option to convert the loan into equity on the maturity date or upon occurrence of an enforcement event. The value of the embedded conversion option was deemed nil as at 31 December 2017.

Capital management

The Board’s policy is to maintain a strong capital base to maintain investor, creditor and market confidence and to sustain future development of the business. The Board of Directors monitors the return on capital based on a ratio calculated as Total liabilities minus Cash and cash equivalents, divided by Shareholders ‘equity:

	2017			2016			2015
	(€’000)
Total liabilities		1,105,343			933,896			744,647
Less: cash		(38,484	)		(115,893	)		(53,686	)
	1,066,859			818,003			690,961
Equity
Total equity		596,728			548,769			507,417
Ratio of Total liabilities minus Cash and cash equivalents, divided by Shareholders’equity:		1.79			1.49			1.36

XML

Share-based payments

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Share-based payments

22 Share-based payments

Summary of outstanding options and restricted shares as of December 31, 2017

The terms and conditions of the grants (excluding restricted shares and performance share grants), under the 2011 and 2013 Option Plans with an USD exercise price, were as follows:

Grant date	Employees entitled	Exercise price in $	Outstanding		Exercisable
		(in thousands)
2011	Senior employees	13.00-14.65		88		88
2012	Senior employees	20.50		1		1
2013	Senior employees	10.00-15.00		4		4
2014	Senior employees	17.50		82		77
2015	Senior employees	24.60-27.26		59		32
2016	Senior employees	27.14-34.00		74		26
2017	Senior employees	35.60-45.84		22		—
	Total share options			330		228

Share options granted from 2011 onwards, under the 2011 and 2013 Option Plans, generally vest over four years and can be exercised up to eight years after the grant date. Vesting typically is over a 4-year period with 25% vested after one year and the 6.25% per quarter thereafter. Options are settled with common shares of Interxion stock. If the employee is terminated prior to the contractual term of the award, all unvested option are forfeited.

The number and weighted average exercise prices of outstanding share options, post reverse stock-split, under the 2008 Option Plan with euro exercise prices are as follows:

	Weighted average exercise price in €						Number of options in thousands
	2017		2016		2015		2017		2016		2015
Outstanding at 1 January		—		—		7.19		—		—		14
Granted		—		—		—		—		—		—
Exercised		—		—		7.19		—		—		(14	)
Expired		—		—		—		—		—		—
Forfeited		—		—		—		—		—		—
Outstanding – 31 December		—		—		—		—		—		—
Exercisable – 31 December		—		—		—		—		—		—

The number and weighted average exercise prices of outstanding share options under the 2011 and 2013 Option Plans, excluding the restricted shares and performance share grants, with U.S. dollar exercise prices are as follows:

	Weighted average exercise price in $						Number of options in thousands
	2017		2016		2015		2017			2016			2015
Outstanding at 1 January		16.70		14.98		14.35		865			1,264			1,641
Granted		37.91		31.20		25.17		30			94			90
Exercised		14.13		14.90		14.23		(550	)		(479	)		(423	)
Expired		—		—		—		—			—			—
Forfeited		30.67		20.49		19.29		(15	)		(14	)		(44	)
Outstanding – 31 December		22.30		16.70		14.98		330			865			1,264
Exercisable – 31 December		18.34		14.22		14.24		228			689			1,030

The options outstanding at December 31, 2017 have a weighted average remaining contractual life of 4.4 years (2016: 3.9 years and 2015: 4.2 years).

For the services delivered in 2014, a total of 9,980 restricted shares were granted to the Non-executive Directors (1,996 restricted shares each). Of these shares, 3,992 were cancelled because two Non-executive Directors resigned before vesting. The remaining 5,988 restricted shares vested as at June 30, 2015 and were issued and transferred to the Non-executive Directors in July 2015.

On June 30, 2015, the Annual General Meeting of Shareholders approved to award restricted shares equivalent to a value of €40,000 under the terms and conditions of the Interxion Holding N.V. 2013 Amended International Equity Based Incentive Plan (the “2013 Option Plan”) to each of our Non-executive Directors (1,615 restricted shares each) for their services to be provided for the period between the 2015 Annual General Meeting and the 2016 Annual General Meeting. A total of 6,460 restricted shares were granted.

On June 24, 2016, the Annual General Meeting of Shareholders approved the award of restricted shares, equivalent to a value of €40,000 under the terms and conditions of the 2013 Option Plan, to each of our Non-executive Directors (1,234 restricted shares each) for their services to be provided for the period between the 2016 Annual General Meeting and the 2017 Annual General Meeting. A total of 4,936 restricted shares were granted.

On 30 June 2017, the Annual General Meeting of Shareholders approved the award of restricted shares equivalent to a value of €40,000 under the terms and conditions of the 2013 Option Plan to each of our Non-executive Directors (996 restricted shares each) for their services to be provided for the period between the 2017 Annual General Meeting and the 2018 Annual General Meeting. A total of 3,984 restricted shares were granted.

2015 Performance Share Awards

With regard to the performance period of 2015, the Board of Directors approved the conditional award of performance shares in March 2015 for certain members of key management and the Executive Director under the terms and conditions of the Company’s 2013 Amended International Equity Based Incentive Plan on the basis of the predetermined, on target equity value for 2015 and the Company’s average share price during the month of January 2015. The actual initial award of 149,600 performance shares, based on the level of the actual Company and individual performance from 1 January 2015 to 31 December 2015, was approved by the Board of Directors in February 2016.

With regard to the Executive Director, the first 50% (38,286 performance shares) of the initial award was approved at the 2016 Annual General Meeting. Of these shares, 19,143 performance shares of the initial award vested on approval but were locked up until 31 December 2016 and 19,143 performance shares vested on 1 January 2017.

With retroactive effect, all performance shares from the 2015 conditional performance share award of our Executive Director that were unvested at the time of the adoption of the 2017 Plan on May 13, 2017, are deemed to have been awarded under the terms and conditions of the 2017 Plan. As a result, 50% of the original 2015 conditional performance share award, 34,320 shares, is subject to the terms of the 2017 Plan. In accordance with the rules of the plan, the shares are subject to the Company’s three-year TSR performance relative to the three-year TSR performance of the constituents of the S&P SmallCap 600 over the period 1 January 2015 through 31 December 2017.

Based on the Company’s actual three-year TSR performance relative to the three-year TSR performance of the constituents of S&P SmallCap 600 over the period 1 January 2015 through 31 December 2017, a final performance share award of 60,060 shares has been earned and approved by the Board in April 2018. The final performance share award is subject to shareholder approval at the Annual General Meeting in 2018. Should the final performance share award be approved, the shares will vest in two equal instalments. The first instalment of 30,030 shares (50% of the final performance share award) will vest upon approval at the Annual General Meeting, the second instalment of 30,030 shares (50% of the final performance share award) will vest on 1 January 2019.

With regard to key members of management, the first 50% of the initial award (36,514 performance shares) was awarded at the 2016 Annual General Meeting. A number of 18,257 performance shares vested on award but were locked up until 31 December 2016 and 18,257 performance shares vested on 1 January 2017. The remaining 50% of the initial award (36,512 performance shares) was subject to the Company’s two-year TSR performance relative to the two-year performance of the S&P SmallCap 600 Index over the period 1 January 2015 through 31 December 2016.

The Company’s actual two-year TSR performance relative to the two-year performance of the S&P SmallCap 600 Index over the period January 1, 2015 through 31 December 2016 was reviewed in March 2017. Based on the Company’s relative TSR performance the Compensation Committee approved a final performance share award of 33,292 performance shares. Of these performance shares, 50% (or 16,646 shares) will vest on May 4, 2018. Of the remaining 16,646 shares 10,642 shares will vest on 1 January 2019, as 6,004 of the 16,646 shares have been forfeited on January 31, 2018.

Upon a change of control and (1) in the event the performance share plan or the individual award agreement is terminated, or (2) the management agreement or employment agreement between the participant and the company is terminated by the company other than for cause, or (3) the participant is offered a position which is a material demotion to the current position, all performance shares will vest immediately and any lock up provisions will expire.

2016 Performance Share Awards

With regard to the performance period of 2016, the Board of Directors approved the conditional award of performance shares in February 2016 for certain members of key management and the Executive Director under the terms and conditions of the Company’s 2013 Amended International Equity Based Incentive Plan on the basis of the predetermined on-target equity value for 2016 and the Company’s average share price during the month of January 2016.

With regard to the Executive Director, with retroactive effect, all 61,469 performance shares from the 2016 conditional performance share award are deemed to have been awarded under the terms and conditions of the 2017 Plan. In accordance with the rules of the 2017 Plan, these shares are subject to the Company’s three-year TSR performance relative to the three-year TSR performance of the constituents of the S&P SmallCap 600 over the period 1 January 2016 through 31 December 2018. The Company’s actual three-year TSR performance relative to the three-year TSR performance of the constituents of the S&P SmallCap 600 over the period 1 January 2016 through 31 December 2018 will be reviewed early 2019. The final award will be subject to Board approval and then Shareholder approval at the 2019 Annual General Meeting. Should it be approved, 50% of the performance shares will vest upon approval at the Annual General Meeting and 50% will vest on 1 January 2020.

With regard to key members of management, an initial award of 76,456 performance shares was approved by the Compensation Committee in February 2017, based on the level of actual company- and individual performance from January 1, 2016, to December 31, 2016. The first 50% of the initial award (38,228 performance shares) was awarded after the 2017 Annual General Meeting. Of the 38,228 performance shares, 19,114 performance shares vested on award but were locked up until 31 December 2017 and 19,114 performance shares will vest on May 4, 2018.

Of the remaining 38,228 performance shares, 27,004 shares were subject to relative TSR performance adjustment, as 11,224 of the 38,228 shares have been forfeited on January 31, 2018. The 27,004 shares were subject to the Company’s two-year TSR performance relative to the two-year performance of S&P SmallCap 600 Index over the period 1 January 2016 through 31 December 2017. The Company’s actual two-year TSR performance relative to the performance of the S&P SmallCap 600 Index over the period 1 January 2016 through 31 December 2017 was reviewed in January 2018. Based on the Company’s relative TSR performance over the two-year performance period, a final performance share award of 40,507 shares (150% of 27,004 shares) has been earned and approved by the Compensation Committee in April 2018. A portion equal to 50% of the final performance share award (20,255 shares) will vest on 1 January 2019 and 50% of the final performance share award (20,252 shares) will vest on 1 January 2020.

Upon a change of control and (1) in the event the performance share plan or the individual award agreement is terminated, or (2) the management agreement or employment agreement between the participant and the company is terminated by the company other than for cause, or (3) the participant is offered a position which is a material demotion to the current position, all performance shares will vest immediately and any lock up provisions will expire.

2017 Performance Share Awards

With regard to the performance period of 2017, the Board of Directors approved the conditional award of 108,213 performance shares in April 2017 for certain members of key management, under the terms and conditions of the Company’s 2013 Amended International Equity Based Incentive Plan, and for the Executive Director under the Company’s 2017 Executive Director Long-Term Incentive Plan, on the basis of the predetermined on-target equity value for 2017 and the Company’s average share price during the month of January 2017.

With regard to the Executive Director, in accordance with the rules of the 2017 Plan, 100% of the conditional performance share award of 46,808 performance shares is subject to the Company’s three-year TSR performance relative to the three-year TSR performance of the constituents of the S&P SmallCap 600 over the period 1 January 2017 through 31 December 2019. The Company’s actual three-year TSR performance relative to the three-year TSR performance of the constituents of the S&P SmallCap 600 over the period 1 January 2017 through 31 December 2019 will be reviewed in early 2020. The final award will be subject to Board and then Shareholder approval at the 2020 Annual General Meeting. Should it be approved, 50% of the performance shares will vest upon approval at the Annual General Meeting and 50% will vest on 1 January 2021.

With regard to the 61,405 performance shares conditionally awarded to key members of management, 46,577 shares are subject to initial adjustment based on company and individual performance over the performance year 2017, as 14,828 of the 61,405 performance shares have been forfeited on January 31, 2018.

Based on the actual level of Company and individual performance from 1 January 2017 through 31 December 2017 an initial award of 48,720 performance shares has been earned and approved by the Compensation Committee in April 2018. The first 50% of the initial award (24,362 performance shares) will be awarded after the 2018 Annual General Meeting. Of the 24,362 performance shares 12,181 shares will vest on award but will be locked up until 31 December 2018 and 12,181 performance shares will vest on 1 January 2019.

The remaining 50% of the initial award (24,358 performance shares) is subject to the Company’s two-year TSR performance relative to the two-year performance of S&P SmallCap 600 Index over the period 1 January 2017 through 31 December 2018. The Company’s actual two-year TSR performance relative to the two-year performance of the S&P SmallCap 600 Index over the period January 1, 2017 through 31 December 2018 will be reviewed in early 2019. Subject to the Compensation Committee’s approval of the final performance share award, 50% of the final performance share award will vest on 1 January 2020, and 50% will vest on 1 January 2021.

Upon a change of control and (1) in the event the performance share plan or the individual award agreement is terminated, or (2) the management agreement or employment agreement between the participant and the company is terminated by the company other than for cause, or (3) the participant is offered a position which is a material demotion to the current position, all performance shares will vest immediately and any lock up provisions will expire.

In 2015, 75,000 restricted shares were awarded to a key member of management (not the Executive Director) of which 25,000 vested in the first quarter of 2015. Half of the remaining 50,000 restricted shares vested on March 1, 2016 and the other 25,000 vested on March 1, 2017. On a change of control, these restricted shares will vest immediately.

In 2016, 20,000 restricted shares were awarded to key members of management (not the Executive Director) of which 5,000 vested in January 2017 and 5,000 vested in January 2018. The remaining 10,000 restricted shares will vest on 1 January 2019 (5,000 shares) and 2020 (5,000 shares). On a change of control, these restricted shares will vest immediately.

In 2017, 10,000 restricted shares were awarded to a key member of management (not the Executive Director) of which 5,000 shares vested in January 2018. The remaining 5,000 restricted shares will vest on 1 January 1, 2019. On a change of control, these restricted shares will vest immediately.

The number and weighted average fair value of restricted shares that were awarded as at December 31, 2017, 2016 and 2015 is broken down as follows:

	2017					2016					2015
	Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)
Outstanding 1 January		253			29.51		308			25.76		272			24.16
Granted		104			47.14		92			35.49		158			28.02
Vested		(147	)		27.84		(124	)		25.66		(118	)		25.05
Forfeited		(40	)		30.98		(23	)		23.67		(4	)		27.38
Outstanding at 31 December		170			41.39		253			29.51		308			25.76

Restricted share awards granted under the 2011 and 2013 Option Plans, generally vest over four years with 25% of the award vesting each year. Restricted share awards are settled with common Interxion stock. If the employee is terminated prior to the contractual term of the award, all unvested restricted shares are forfeited. Restricted shares awarded to our Non-executive Directors for their services, vest annually at the Annual General Meeting.

The restricted shares outstanding at December 31, 2017 have a weighted average remaining contractual life of 2.5 years (2016: 1.9 years; 2015: 2.1 years).

The number and weighted average fair value of performance shares that were finally awarded as at December 31, 2017, 2016 and 2015 is broken down as follows:

	2017					2016					2015
	Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)
Outstanding 1 January		253			27.92		129			23.94		—			—
Granted		62			38.80		196			30.42		163			24.33
Vested		(108	)		29.37		(72	)		27.63		(34	)		25.77
Forfeited		(3	)		21.20		—			—		—			—
Outstanding at 31 December		204			30.55		253			27.92		129			23.94

The performance share plan was modified during 2017, see the disclosure on Executive Director Compensation, which is included in Note 27 — Related-party transactions, for details about the modification.

Employee expenses

In 2017, the Company recorded employee expenses of €9.9 million related to share-based payments (2016: €7.9 million and 2015: €9.0 million). The 2017 share-based payments related expenses include an amount of €1.0 million related to taxes and social security charges (2016: €0.2 million and 2015: €0.6 million).

The weighted average fair value at grant date of options granted during the period was determined using the Black-Scholes valuation model. The following inputs were used:

	2017	2016	2015
Share price in € at grant date	37.48-48.38	28.09-33.89	23.84-28.46
Exercise price in €	31.68-39.08	24.27-30.47	21.61-24.95
Dividend yield	0%	0%	0%
Expected volatility	26%	30%	30%
Risk-free interest rate	1.8%-2.1%	1.2%	0.0%-0.4%
Expected life weighted average	5.1 years	5.0 years	5.1 years

The significant inputs into the model were:

• expected volatility is based on a combination of the share performance of the Company over a five-year period;

• the risk-free interest rate based on the yield on U.S. Treasury Strips with a maturity similar to the expected life of the options;

• dividend yield is considered to be nil;

• expected life is considered to be equal to the average of the share option exercise and vesting periods.

The weighted average fair value at grant date of the performance shares granted during the period was determined using the Monte Carlo valuation model. In addition to the above-mentioned inputs a one year holding discount of 5.5% was used as input for the performance shares.

Change of control clauses

Some awards to key management contain change of control clauses. Upon a change of control and (1) in the event the performance share plan or the individual award agreement is terminated, or (2) the management agreement or employment agreement between the participant and the company is terminated by the company other than for cause, or (3) the participant is offered a position which is a material demotion to the current position, all performance shares will vest immediately and any lock up provisions will expire.

XML

Business combinations

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Business combinations

23 Business combinations

Acquisition Interxion Science Park

On February 24, 2017, the Group completed the acquisition of 100% of the share capital of Vancis B.V. (“Vancis”), a company that historically provided colocation services from a data center at Science Park, Amsterdam, The Netherlands, and a satellite facility in Almere, The Netherlands. After the acquisition, Vancis B.V. was renamed InterXion Science Park B.V. Total consideration was €77.5 million of cash, which was paid immediately upon completion. The transaction was accounted for as a business combination, which requires that assets acquired and liabilities assumed be recognized at their respective fair values at the acquisition date.

The table below summarizes the purchase price allocation for the acquisition of Interxion Science Park:

	€’000
Property, plant and equipment		16,821
Trade receivables(1)		1,165
Other current assets		959
Trade payables and other liabilities		(1,249	)
Provisions		(280	)
Goodwill		38,900
Customer portfolio		28,005
Deferred taxes		(6,804	)
Total purchase price		77,517

Notes:

(1) Trade and other receivables represent contractual gross amounts less €30 thousand, which was determined to be uncollectible at the date of acquisition.

Goodwill is the excess consideration remaining after allocating the fair value of the other acquired assets and liabilities and represents expected future economic benefits, to be achieved by operating a data center in close proximity to the virtual connectivity hub at Science Park, and is not expected to be deductible for tax purposes.

In connection with this acquisition, the Company recorded M&A transaction costs of approximately €1.2 million, which have been included in General and administrative costs as incurred (€0.5 million in 2017 and €0.7 million in 2016).    

Since the acquisition date, Interxion Science Park contributed €6.5 million to total revenues and €0.1 million loss to the Group’s net income. If the acquisition had occurred on January 1, 2017, management estimates that consolidated revenue would have been €490.6 million, and net income for the period would have been €42.3 million. Interxion Science Park is included in the Big4 segment.

XML

Financial commitments

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Financial commitments

24 Financial commitments

Non-cancellable operating lease commitments

At December 31, the Group has future minimum commitments for non-cancellable operating leases with terms in excess of one year as follows:

	2017		2016		2015
	(€’000)
Within 1 year		35,107		28,698		30,857
Between 1 and 5 years		136,143		118,115		125,243
After 5 years		189,298		171,313		181,059
		360,548		318,125		337,159

The total gross operating lease expense for the year 2017 was €29.6 million (2016: €27.5 million and 2015: €27.0 million).

Future committed revenue receivable

The Group enters into initial contracts with its customers for periods of at least one year and generally between three and five years, resulting in future committed revenues from customers. At December 31 the Group had contracts with customers for future committed revenue receivable as follows:

	2017		2016		2015
	(€’000)
Within 1 year		327,500		296,600		275,400
Between 1 and 5 years		449,500		434,900		353,600
After 5 years		35,600		52,700		76,700
		812,600		784,200		705,700

Commitments to purchase energy

Where possible, for its own use, the Group seeks to purchase power on fixed-price term agreements with local power supply companies in the cities in which it operates. In some cases the Group also commits to purchase certain minimum volumes of energy at fixed prices. At December 31, the Group had entered into non-cancellable energy purchase commitments as follows:

	2017		2016		2015
	(€’000)
Within 1 year		41,500		39,100		36,400
Between 1 and 5 years		42,000		21,000		13,700
		83,500		60,100		50,100

Other commitments

The Group has entered into several other commitments, which in general relate to operating expenses. As at December 31, 2017, the outstanding commitments amount to €43.7 million (2016: €40.6 million, 2015: €29.5 million).

XML

Capital commitments

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Capital commitments

25 Capital commitments

At December 31, 2017, the Group had outstanding capital commitments totaling €285.9 million (2016: €114.1 million and 2015: €66.2 million). These commitments are expected to be settled in the following financial year. The increase results from the timing of expansion projects.

XML

Contingencies

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Contingencies

26 Contingencies

Guarantees

Certain of our subsidiaries have granted guarantees to our lending banks in relation to our borrowings. The Company has granted rent guarantees to landlords of certain of the Group’s property leases. Financial guarantees granted by the Group’s banks in respect of leases amount to €5.1 million (2016: €4.6 million; 2015: €6.0 million). Furthermore, the Company guaranteed a third-party’s future payments in amount of €0.4 million. No other guarantees were granted (2016: €1.0 million and 2015: €0.1 million).

Site restoration costs

As at December 31, 2017, the estimated discounted cost and recognized provision relating to the restoration of data center leasehold premises was €0.3m (2016: nil and 2015: €0.7 million).

In accordance with the Group’s accounting policy site restoration costs have been provided in the financial statements only in respect of premises where the liability is considered probable and the related costs can be estimated reliably. As at December 31, 2017, the Group estimated the possible liability to range from nil to €29.2 million (2016: nil to €24.7 million and 2015: nil to €23.2 million).

XML

Related-party transactions

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Related-party transactions

27 Related-party transactions

There are no material transactions with related parties, other than those related to our investment disclosed in note 13 and the information disclosed below.

Key management compensation

The total compensation of key management, which was recognized in the consolidated income statement, was as follows:

	2017		2016(i)		2015(i)
	(€’000)
Short-term employee benefits (salaries and bonuses)		3,454		3,473		3,341
Post-employment benefits		62		74		43
Share-based payments		6,386		4,700		4,997
Total		9,902		8,247		8,381

Key management’s share-based payment compensation is disclosed in Note 22.

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Remuneration of the Executive Director and Non-executive Directors of the Board

The aggregate reported compensation expense of our Executive Director and the Non-Executive Directors of the Board for the years ended December 31, 2017, 2016 and 2015, is set forth below. The “Share-based payment charges” and the “Total” numbers included in the following tables are calculated in accordance with IFRS accounting standards and reflect charges for both the shares that vested in the year as well as charges for shares that are scheduled to vest in future years.:

	2017
	Salaries			Bonus			Share- based payment charges		Total
	(€’000)
D.C. Ruberg		590	1		668	2		4,198		5,456
F. Esser		65			—			40		105
M. Heraghty		70			—			40		110
J.F.H.P. Mandeville		90			—			40		130
R. Ruijter		75			—			40		115
Total		890			668			4,358		5,916

	2016									2015
	Salaries			Bonus		Share- based payment charges(i)		Total		Salaries			Bonus		Share- based payment charges(i)		Total
	(€’000)									(€’000)
D.C. Ruberg		590	1		597		2,044		3,231		590	1		693		2,120		3,403
J.C. Baker											21			—		—		21
F. Esser		65			—		40		105		65			—		27		92
M. Heraghty		70			—		40		110		68			—		27		95
J.F.H.P. Mandeville		115	3		—		40		155		40			—		27		67
R.M. Manning											17			—		—		17
R. Ruijter		75			—		40		115		73			—		65		138
Total		915			597		2,204		3,716		874			693		2,266		3,833

1 Includes allowance of €40,000.

2 Based on performance achievements during 2017, this amount is calculated as 121.4% of base salary.

3 Includes €25,000 that has additionally been awarded in relation to the period of July 1, 2015 – December 31, 2015.

(i) Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

In 2017, 3,984 restricted shares were granted to the Non-executive Directors (996 restricted shares each). Costs related to these grants are reflected as part of share-based payment charges.

The goal of the Company’s remuneration policy is to provide remuneration to its Directors in a form that will attract, retain and motivate qualified industry professionals in an international labor market, and to align the remuneration of the Directors with their short- and long-term performance as well as with interests of the stakeholders of the Company. The compensation of our Directors will be reviewed regularly.

Executive Director Compensation

The total direct compensation program for our Executive Director consists of (i) a base salary, (ii) short-term incentives (“STI”) in the form of an annual cash bonus, (iii) long term incentives (“LTI”) in the form of performance shares, and (iv) perquisites consisting of a car allowance. Our goal is to provide the Executive Director with a base salary around the 50^th percentile and STI and LTI in the range of the 50^th to 75^th percentile of our peer group discussed below.

Overall, for 2015, 2016, and 2017, at risk compensation was 79% of total compensation at target and 86% of total compensation at maximum pay-out of both STI and LTI. The ultimate value of the annual LTI award to the Executive Director is dependent on (1) the number of shares actually earned based on the Company’s relative TSR performance against the constituents of the S&P SmallCap 600 and (2) the Company’s share price on the date of determination. The charts below have been based on (i) the number of shares awarded at target and at maximum pay-out of 175% of the number of shares awarded at target and (ii) are valued using the Company’s share price on the date of the conditional award. These charts do not take into account any appreciation or depreciation of the Company share price that may occur over the performance period.

LOGO

The Company operates in a highly competitive and fast-growing environment where most of our peers are U.S. headquartered companies. We therefore fashion our compensation structures and pay mix to blend both European and U.S. practices. We assess the compensation of the Executive Director against the compensation of executive directors at peer companies based on data provided by Mercer. Our peer group consists of the companies listed below, most of which have European operations and with whom we compete for talent and/or customers and capital. The benchmarking analysis takes into consideration the relative Company size, the Company’s European aspects, and the growth trajectory of our Company. We benchmark our compensation levels every three years, under the guidance of the Compensation Committee, with the most recent analysis performed by Mercer in March 2017.

Our peer group consists of the following companies:

•  Akamai Technologies	•  Dupont Fabros Technologies1)	•  Red Hat
•  Autodesk	•  Equinix	•  Synopsys
•  Coresite Realty	•  F5 Networks	•  Trimble Navigation
•  CyrusOne	•  Factset Research Systems
•  Digital Realty Trust1)	•  Internap Network Services

¹⁾  In the course of 2017, Dupont Fabros Technologies was acquired by Digital Realty.

Short Term Incentive

The STI plan for our Executive Director provides for an annual cash bonus. The annual at target value of the cash bonus is 110% of base salary (the “Target Cash Bonus”) for 2017 (compared to 100% of base salary for 2015 and 2016), with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The actual pay-out from the STI plan depends on the achievement of Revenue, Adjusted EBITDA Margin, and individual objectives, all measured over the performance year. These performance objectives are set each year by the Compensation Committee at the beginning of the performance period and are based on the Company’s operating plan. Individual objectives are focused on internal organisational improvements.

The performance achievement on each of these measures, together with their weighting, determine the pay-out of the cash bonus in accordance with the table below.

Pay-out as % of Target Cash Bonus

	Pay-out at Threshold Performance			Pay-out at Target Performance			Pay-out at Maximum Performance
Revenue		0	%		40	%		60	%
Adjusted EBITDA Margin		0	%		40	%		60	%
Individual Performance Objectives		0	%		20	%		25	%
Pay-out as % of at target cash bonus		0	%		100	%		145	%

The cash bonus is paid once Shareholders approve the annual accounts for the performance year at the Annual General Meeting in the following year.

Long Term Incentive

On May 13, 2017 the Board adopted the InterXion Holding N.V. 2017 Executive Director Long-Term Incentive Plan (the “2017 Plan”). The 2017 Plan provides for a number of changes in our Executive Director’s long-term incentive plan to align his long-term incentive compensation (as formerly awarded under the terms and conditions of the InterXion Holding N.V. 2013 Amended International Equity Based Incentive Plan, the “2013 Plan”) with best practices. The main changes are listed below:

• Disconnected long-term incentive compensation from short-term Company performance by making 100% of the annual conditional performance share awards to our Executive Director subject to relative total shareholder return (“TSR”) performance only.

• Extended the relative TSR performance period from two to three years.

• Changed the way performance is measured, moving from measuring the Company’s TSR performance against the performance of the S&P SmallCap 600 Index, to measuring our TSR performance against the TSR performance of the constituents of the S&P SmallCap 600, based on a percentile ranking approach. Given the unique nature of our business and the number of direct peers in our industry, we consider the S&P SmallCap 600 to be the appropriate comparator group.

• The value of the award at target was not changed. The maximum pay-out opportunity was increased from 150% to 175% of the at target award as the result of the plan amendment, and this award adjustment is a consequence of longer and more rigorous performance conditions.

The 2017 Plan has a four-year vesting period with no additional holding requirements. The Compensation Committee carefully considered whether implementation of a holding period or stock ownership requirement was appropriate at the time of the adoption of the plan. Considering that our Executive Director has a substantial personal shareholding in the Company’s shares, the Committee decided that such provisions are not currently necessary. The Board and the Compensation Committee are constantly striving to ensure strong alignment of our Executive Director’s interests with long-term shareholder value throughout his employment with the Company and will keep this matter under regular review.

The 2017 Plan does not increase the total number of shares that may be granted to the Executive Director, but rather the 2017 Plan will share in the same share pool that remains available for grant under the 2013 Plan.

The terms and conditions of the 2017 Plan not only apply to the 2017 conditional performance share award and future awards to our Executive Director, but also retroactively to shares from the conditional performance share awards made to the Executive Director in 2015 and 2016, that were unvested at the time of the adoption of the 2017 Plan.

Pursuant to the 2017 Plan, performance shares are conditionally awarded on an annual basis at the beginning of each performance year. The annual at target value of the conditional performance share award to our Executive Director in 2015, 2016 and 2017 was 300% of base salary. The number of performance shares conditionally awarded per annum is determined by the annual at target value of the conditional award and the January average Company share price and USD/EUR exchange rate in the first performance year (conditional award year).

The conditional performance share award to the Executive Director is granted at target and subject to the Company’s TSR performance relative to the TSR performance of the constituents of the S&P Small Cap 600 over a three-year period. The three-year performance period runs from January 1 in the first performance year through December 31^st in the third performance year. The basis for the performance achievement calculation is the average closing share price in the month of January in the first performance year, and the average closing share price in the month of December in the third performance year. Performance is measured based on a percentile ranking basis, with pay-outs in accordance with the performance/pay-out table below:

TSR Performance Categories (S&P SmallCap 600 Constituents)	Adjustment to the number of Performance Shares Conditionally Awarded
75th Percentile or greater	x 1.75
50th Percentile	x 1.00
25th Percentile	x 0.25
Less than 25th Percentile	x 0.00

For performance between percentile levels shown, pay-outs are linearly interpolated.

Subject to the relative TSR performance threshold being met, the performance shares will vest in two equal instalments. The first instalment (50% of the final performance share award) will vest upon approval at the Annual General Meeting in the year following the end of the three-year performance period. The second instalment (50% of the final performance share award) will vest on the fourth anniversary of the conditional award.

Upon a change of control AND (1) in the event the performance share plan or the individual award agreement is terminated, or (2) the management agreement between the Executive Director and the Company is terminated by the Company other than for cause, or (3) the Executive Director is offered a position which is a material demotion to the current position, all performance shares will vest immediately.

Upon retirement, permanent disability or death of the Executive Director, all outstanding and unvested portions of awards will be pro-rated for the period served during the performance period. The pro-rated number of shares will then be adjusted for relative TSR performance over the three-year performance period, and vest in accordance with the vesting schedule of the plan.

In the event the management agreement between the Executive Director and the Company is terminated for cause, all vested and unvested parts of awards made pursuant to the 2017 Plan will be forfeited immediately.

Potential Compensation Pay-Outs

The tables below summarise our Executive Director’s at target and maximum total direct compensation in 2015, 2016 and 2017 (amounts in €’000).

	2015 & 2016 Annual at target amounts			2017 Annual at target amounts
Base Salary		550			550
Car Allowance		40			40
STI: Cash Bonus		550	(100% of Base Salary)		605	(110% of Base Salary)
LTI: Performance Shares		1,650	(300% of Base Salary)*		1,650	(300% of Base Salary)
Total direct compensation		2,790			2,845

	2015 & 2016 Annual maximum amounts			2017 Annual maximum amounts
Base Salary		550			550
Car Allowance		40			40
STI: Cash Bonus		798	(145% of at target bonus)		877	(145% of at target bonus)
LTI: Performance Shares		2,887	(175% of at target award in # shares)*		2,887	(175% of at target award in # shares)
Total direct compensation		4,275			4,354

* For the years 2015 and 2016, the tables provide the at target and maximum values at award date of the conditional performance share awards made in these years. Of the 68,639 performance shares that were conditionally awarded in 2015, 38,286 shares from this award have vested following the initial adjustment in 2016 of the number of performance shares (in accordance with the terms and conditions of the previous long-term incentive plan), and shareholder approval at the 2016 Annual General Meeting. The unvested portion of 34,320 shares (50%) of the 2015 conditional performance share award is subject to the terms and conditions of the 2017 Plan. The 61,469 performance shares conditionally awarded in 2016 are all subject to the terms and conditions of the 2017 Plan.

In April 2017 the Board approved an increase of the Target Cash Bonus from 100% to 110% of annual base salary to align the cash bonus at target to common practice within our peer group, in accordance with our competitive positioning statement. There was no adjustment made to base salary.

The LTI values are the values at the date of award of the conditional performance share awards to the Executive Director. These values have been based on the number of shares awarded at target and at maximum pay-out of 175% of the number of shares awarded at target, using the Company share price and USD/EUR exchange rate on the date of the conditional award. These values do not take into account any appreciation or depreciation of the Company share price that may occur over the performance period.

The number of shares at target is derived from the annual at target LTI value of 300% of the Executive Director’s base salary, and the January averages of both the Company closing share price and the USD/EURO exchange rate in the conditional award year. The number of performance shares conditionally awarded in each of these award years are provided in the section below under “2015 – 2017 Long-Term Incentive Awards”.

Actual Short-Term Incentive Pay-Outs: 2015 Achievement Against Target

In 2015, the Target Cash Bonus for our Executive Director was €550,000, or 100% of base salary, with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The table below sets out the performance targets set for 2015 and the achievement against them.

	Target Weighting			Target Performance			Actual Performance			Pay-out (% of at target cash bonus)
Revenue (in million €)		40	%		381.6			386.6			60	%
Revenue Growth					12.0	%		13.5	%
Adjusted EBITDA Margin		40	%		44.0	%		44.3	%		46	%
Individual Performance Objectives		20	%					Met			20	%
Overall Performance Achievement %		100	%								126.0	%

Based on actual performance delivered in the performance year 2015, a bonus pay-out of €693,000 (126.0% of the Target Cash Bonus) was approved by the Board in February 2016. The cash bonus was paid upon Shareholder approval of the 2016 annual accounts at the Annual General Meeting in June 2017. The Revenue and the Adjusted EBITDA Margin targets were set for Revenue and Adjusted EBITDA based on the definition of these financial measures as set out in the Consolidated Financial Statements.

Actual Short-Term Incentive Pay-outs: 2016 Achievement Against target

In 2016, the Target Cash Bonus for our Executive Director was €550,000, or 100% of base salary, with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The table below sets out the performance targets set for 2016 and the achievement against them.

	Target Weighting			Target Performance			Actual Performance			Pay-out (% of at target cash bonus)
Revenue (in million €)		40	%		424.0			421.8			28.6	%
Revenue Growth					9.7	%		9.1	%
Adjusted EBITDA Margin		40	%		44.9	%		45.3	%		60	%
Individual Performance Objectives		20	%					Met			20	%
Overall Performance Achievement %		100	%								108.6	%

Based on actual performance delivered in the performance year 2016, a bonus pay-out of €597,143 (108.6% of the Target Cash Bonus) was approved by the Board in February 2017. The cash bonus was paid upon Shareholder approval of the 2016 annual accounts at the Annual General Meeting in June 2017. The Revenue and the Adjusted EBITDA Margin targets were set for Revenue and Adjusted EBITDA based on the definition of these financial measures as set out in the Consolidated Financial Statements.

Actual Short-Term Incentive Pay-outs: 2017 Achievement Against target

In 2017, the Target Cash Bonus for our Executive Director was €605,000, or 110% of base salary, with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The table below sets out the performance targets set for 2017 and the achievement against them.

	Target Weighting			Target Performance			Actual Performance			Pay-out (% of at target cash bonus)
Revenue (in million €)		40	%		473.5			493.5			60.0	%
Revenue Growth					12.3	%		17.0	%
Adjusted EBITDA Margin		40	%		45.5	%		45.0	%		27.3	%
Individual Performance Objectives		20	%					115.0	%		23.0	%
Overall Performance Achievement %											110.3	%

For 2017, the performance against the revenue and Adjusted EBITDA Margin target was calculated based on constant currency Current and comparative prior period results for entities reporting in currencies other than Euro are converted into Euro using the YTD average exchange rates from the prior period rather than the actual exchange rates in effect during the current period. Reported revenue and Adjusted EBITDA Margin were €489.3 million and 45.2%, respectively.

Based on actual performance delivered in the performance year 2017, a bonus pay-out of €667,585 (110.3% of the Target Cash Bonus) was approved by the Board in April 2018. The cash bonus will be paid upon Shareholder approval of the 2017 annual accounts at the Annual General Meeting in 2018.

2015 – 2017 Long-Term Incentive Awards

The following table provides the number of performance shares conditionally awarded in 2015, 2016 and 2017 and the number of shares that would would potentially be awarded (subject to Board and Shareholder approval at the relevant Annual General Meeting) based on three-year relative TSR performance at the 25^th, 50^th, and 75^th percentile performance of the constituents of the S&P SmallCap 600.

	# Performance shares conditionally awarded*			# Performance shares to be awarded based on relative TSR performance
Conditional award year				At 25th percentile		At 50% percentile		At 75th percentile
2015		34,320	**		8,580		34,320		60,060
2016***		61,469			15,367		61,469		107,571
2017***		46,808			11,702		46,808		81,914

* Calculated based on the Company’s January average closing share price of $27.95 (2015), $29.16 (2016) and $37.42 (2017).

** The unvested portion (50%) of the 2015 conditional performance share award of 68,639 performance shares. 38,286 shares from the 2015 award have already vested following the initial adjustment in 2016 of the number of performance shares (in accordance with the terms and conditions of the previous long-term incentive plan), and shareholder approval of the adjusted award at the Annual General Meeting in June 2016.

*** The final award determination of the performance shares conditionally awarded in 2016, will be determined early 2019, in accordance with the rules of the 2017 Plan. The final award determination of the performance shares conditionally awarded in 2017 will be determined early 2020. The final performance share awards for the award years 2016 and 2017 will be subject to Board approval and then shareholder approval at the Annual General Meetings in 2019 and 2020, respectively. Should the final relevant awards be approved, the shares will vest in two equal instalments. The first instalment (50% of the initial performance share award) will vest upon approval of the relevant Annual General Meeting, the second instalment (50% of the final performance share award) will vest on January 1^st of the following year.

With retroactive effect, all performance shares from the conditional performance share awards made in 2015 and 2016 that were unvested at the time of the adoption of the 2017 Plan are deemed to have been awarded under the terms and conditions of the 2017 Plan.

With respect to the 34,320 unvested performance shares from the 2015 conditional performance share award, the Company’s three-year TSR performance relative to the three-year TSR performance of the constituents of the S&P SmallCap 600 over the period January 1, 2015 through December 31, 2017 has been ranked at the 85^th percentile.

The following table provides the Company’s three-year TSR performance and the three-year TSR performance of the constituents of the S&P SmallCap over the period January 1, 2015 through December 31, 2017.

	Cumulative TSR*
S&P SmallCap 600
75th Percentile		74	%
50th Percentile		32	%
25th Percentile		-9	%
INXN		105	%

* Starting price is the average closing share price in the month of January 2015, ending price is the average closing share price in the month of December 2017. Includes share price appreciation/depreciation, re-investment of dividends and the compounding effect of dividends paid on re-invested dividends, all over the relevant performance period.

Based on the Company’s actual three-year TSR performance relative to the three-year TSR performance of the constituents of S&P SmallCap 600 over the period January 1, 2015 through December 31, 2017 and the performance/pay-out table in the 2017 Plan, a final performance share award has been calculated of 60,060 shares and approved by the Board in April 2018. The final performance share award is subject to shareholder approval at the Annual General Meeting in 2018. Should the final performance share award be approved, the shares will vest in two equal instalments. The first instalment of 30,030 shares (50% of the final performance share award) will vest upon approval at the Annual General Meeting, the second instalment of 30,030 shares (50% of the final performance share award) will vest on January 1, 2019.

XML

Events subsequent to the balance sheet date

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Events subsequent to the balance sheet date

28 Events subsequent to the balance sheet date

On March 16, 2018 we entered into a €225.0 million unsecured subordinated revolving facility agreement (the “2018 Subordinated Revolving Facility Agreement”) by and among InterXion Holding N.V. (the “Company”), ABN AMRO Bank N.V. and Bank of America Merrill Lynch International Limited as arrangers and original lenders thereunder and ABN AMRO Bank N.V. as agent.

The 2018 Subordinated Revolving Facility Agreement has an initial maturity date of December 31, 2018, with the Company having the option to extend the maturity date up to and including December 31, 2019 in accordance with the terms of the 2018 Subordinated Revolving Facility Agreement. The 2018 Subordinated Revolving Facility Agreement initially bears interest at an annual rate equal to EURIBOR (subject to a zero percent floor) plus a margin of 3.00% per annum from the date of the 2018 Subordinated Revolving Facility Agreement, subject to a margin ratchet pursuant to which the margin may increase thereafter on certain specified dates and subject to a maximum margin of 4.50% per annum.

The Company also received, on March 1, 2018, the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement in relation to entering into the 2018 Subordinated Revolving Facility Agreement.

On February 20, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Senior Revolving Facility Agreement to waive, from the date of such consent becoming effective and up to, and including, May 1, 2018, the undertaking requiring certain material subsidiaries of the Company to accede to the 2013 Super Senior Revolving Facility Agreement as additional guarantors and, for the same period, to reduce the guarantor coverage threshold as a percentage of the group’s consolidated adjusted EBITDA (as more fully set out in the 2013 Super Senior Revolving Facility Agreement) from 85% to 80%. On April 19, 2018, the Company received the requisite consents from lenders under its 2013 Super Senior Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018

On February 19, 2018 the Company also received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the date by which certain subsidiaries of the Company are required to accede to the 2017 Senior Secured Revolving Facility Agreement as guarantors to April 30, 2018. On April 20, 2018, the Company received the requisite consents from lenders under its 2017 Senior Secured Revolving Facility Agreement to extend the foregoing waivers, up to, and including, July 31, 2018.

XML

Correction of errors

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Correction of errors

29 Correction of errors

During the preparation of the 2017 consolidated financial statements, the Company became aware that the share-based payment expenses have not been properly recognized in accordance with IFRS 2, resulting in an understatement of such expenses in its Consolidated Financial Statements since 2014. The errors have been corrected by restating each of the affected financial statement line items for prior periods, which corrections have been assessed to be immaterial to each of those prior periods. The following tables summarize the impacts on the Company’s Consolidated Financial Statements.

Consolidated statement of financial position

January 1, 2015	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
Total assets		1,173,103			—			1,173,103
Total liabilities		736,958			—			736,958
Share premium		495,109			634			495,743
Accumulated profit/(deficit)		(76,089	)		(634	)		(76,723	)
Others		17,125			—			17,125
Total Shareholder’s equity		436,145			—			436,145

December 31, 2015	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
Total assets		1,252,064			—			1,252,064
Total liabilities		744,647			—			744,647
Share premium		507,296			2,520			509,816
Accumulated profit/(deficit)		(27,523	)		(2,520	)		(30,043	)
Others		27,644			—			27,644
Total Shareholder’s equity		507,417			—			507,417

December 31, 2016	Impact of correction of error
	(€’000)
	As previously reported		Adjustments			As corrected
Total assets		1,482,665		—			1,173,103
Total liabilities		933,896		—			736,958
Share premium		519,604		4,067			523,671
Accumulated profit/(deficit)		12,360		(4,067	)		(8,293	)
Others		16,805		—			17,125
Total Shareholder’s equity		548,769		—			436,145

Consolidated income statement and consolidated statement of comprehensive income

For the year ended December 31, 2015	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
General and administrative costs		(132,505	)		(1,886	)		(134,391	)
Others		181,071			—			181,071
Net income		48,566			(1,886	)		46,680
Other comprehensive income/(loss, net of tax		10,459			—			10,459
Total comprehensive income attributable to shareholders		59,025			(1,886	)		57,139
Earnings per share attributable to shareholders
Basic earnings per share: (€)		0.70			(0.03	)		0.67
Diluted earnings per share: (€)		0.69			(0.03	)		0.66

For the year ended December 31, 2016	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
General and administrative costs		(137,010	)		(1,547	)		(138,557	)
Others		181,071			—			181,071
Net income		39,883			(1,547	)		38,336
Other comprehensive income/(loss), net of tax		(10,907	)		—			(10,907	)
Total comprehensive income attributable to shareholders		28,976			(1,547	)		27,429
Earnings per share attributable to shareholders
Basic earnings per share: (€)		0.57			(0.03	)		0.54
Diluted earnings per share: (€)		0.56			(0.02	)		0.54

Key management compensation (Note 27)

For the year ended December 31, 2015	Impact of correction of error
	(€’000)
	As previously reported		Adjustments		As corrected
Short-term employee benefits (salaries and bonuses)		3,341		—		3,341
Post-employment benefits		43		—		43
Share-based payments		3,381		1,886		5,267
		6,765		1,886		8,651

For the year ended December 31, 2016	Impact of correction of error
	(€’000)
	As previously reported		Adjustments		As corrected
Short-term employee benefits (salaries and bonuses)		3,473		—		3,473
Post-employment benefits		74		—		74
Share-based payments		3,427		1,547		4,974
		6,974		1,547		8,521

There is no impact on the Company’s operating, investing or financing cash flows for the years ended December 31, 2015 and December 31, 2016.

XML

Basis of preparation (Policies)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Statement of compliance

Statement of compliance

The consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”), effective as at December 31, 2017, as issued by the International Accounting Standards Board (“IASB”), and IFRS as adopted by the European Union.

Basis of measurement

Basis of measurement

The Group prepared its consolidated financial statements on a going-concern basis and under the historical cost convention except for certain financial instruments that have been measured at fair value.

IFRS basis of presentation

IFRS basis of presentation

The audited consolidated financial statements as of December 31, 2017, 2016 and 2015 have been prepared in accordance with International Financial Reporting Standards (IFRS) as endorsed by the European Union (EU). All standards and interpretations issued by the International Accounting Standards Board (IASB) and the IFRS Interpretations Committee effective for the year ended 2017 have been endorsed by the EU, except that the EU did not adopt certain paragraphs of IAS 39 applicable to hedge transactions. The Group has no hedge transactions to which these paragraphs are applicable. Consequently, the accounting policies applied by the Group also comply with IFRS as issued by the IASB.

Change in accounting policies

Change in accounting policies

The Group has consistently applied the accounting policies set out below to all periods presented in these consolidated financial statements. The standards below are applicable for financial statements as prepared after January 1, 2016, for IFRS as issued by the International Accounting Standards Board, and are effective for IFRS as endorsed by the EU for periods ending after January 1, 2017.

• Amendments to IAS 7 – Disclosure initiative

• Amendments to IAS 12 – Recognition of Deferred Tax Assets for Unrealized Losses

For preparation of these financial statements, the Group has concluded that these standards do not have a significant impact.

Correction of errors

Correction of errors

Certain comparative amounts in the consolidated income statements, consolidated statements of comprehensive income, consolidated statements of financial position and consolidated statements of cash flows have been restated to correct for immaterial errors with respect to share-based payments. The impact of this restatement is disclosed in note 29 – Correction of errors. Throughout the consolidated financial statements, columns including comparative figures that have been restated, are indicated with ^‘(i)’.

Use of estimates and judgments

Use of estimates and judgments

The preparation of financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates, which together with underlying assumptions, are reviewed on an on-going basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected.

Judgments, estimates and assumptions applied by management in preparing these financial statements are based on circumstances as at December 31, 2017, and Interxion operating as a stand-alone company.

In particular, information about significant areas of estimation uncertainty and critical judgments in applying accounting policies that have the most significant effect on amounts recognized in the financial statements are discussed below:

Property, plant and equipment and depreciation (see also Note 11) — Estimated remaining useful lives and residual values of property plant and equipment, including assets recognized upon a business combination, are reviewed annually. The carrying values of property, plant and equipment are also reviewed for impairment, where there has been a triggering event, by assessing the present value of estimated future cash flows and net realizable value compared with net book value. The calculation of estimated future cash flows and residual values is based on the Group’s best estimates of future prices, output and costs and is, therefore, subjective. In addition, the valuation of some of the assets under construction requires judgments that are related to the probability of signing lease contracts and obtaining planning permits. Regarding the properties acquired as part of the acquisition of InterXion Science Park B.V. we recognized fair value at acquisition date, based on the highest and best use.

Intangible assets and amortization (see also Note 12) — Estimated remaining useful lives of intangible assets, including those recognized upon a business combination, are reviewed annually. The carrying values of intangible assets are also reviewed for impairment where there has been a triggering event by assessing the present value of estimated future cash flows and fair value compared with net book value. The calculation of estimated future cash flows is based on the Group’s best estimates of future prices, output and costs and is, therefore, subjective. The customer portfolio acquired as part of the acquisition of InterXion Science Park B.V. was valued based on the multi-period excess earnings method, which considers the present value of net cash flows expected to be generated by the customer portfolio, excluding any cash flows related to contributory assets.

Goodwill (see also Note 12) — Goodwill is recognized as the amount by which the purchase price of an acquisition exceeds the fair values of the assets and liabilities identified as part of the purchase price allocation. Goodwill is not being amortized, but subject to an annual impairment test.

Lease accounting (see also Note 24) — At inception or modification of an arrangement, the Group determines whether such an arrangement is, or contains, a lease. Classification of a lease contract is based on the extent to which risks and rewards incidental to ownership of a leased asset lie with the lessor or the lessee. The classification of lease contracts includes the use of judgments and estimates.

Provision for onerous lease contracts (see also Note 19) — A provision is made for the discounted amount of future losses that are expected to be incurred in respect of unused data center sites over the term of the leases. Where unused sites can be sublet, or partly sublet, management has taken account of the contracted sublease income expected to be received over the minimum sublease term, which meets the Group’s revenue recognition criteria in arriving at the amount of future losses.

Costs of site restoration (see also Note 26) — Liabilities in respect of obligations to restore premises to their original condition are estimated at the commencement of the lease and reviewed annually, based on the rent period, contracted extension possibilities and possibilities of lease terminations.

Deferred tax (see also Note 10) — Provision is made for deferred tax at the rates of tax prevailing at the period-end dates unless future rates have been substantively enacted. Deferred tax assets are recognized where it is probable that they will be recovered based on estimates of future taxable profits for each tax jurisdiction. The actual profitability may be different depending on local financial performance in each tax jurisdiction.

Share-based payments (see also Note 22) — The Group issues equity-settled share-based payments to certain employees under the terms of the long-term incentive plans. The charges related to equity-settled share-based payments, options to purchase ordinary shares and restricted and performance shares, are measured at fair value at the grant date. Fair values are being redetermined for market conditions as of each reporting date, until final grant date. The fair value at the grant date of options is determined using the Black Scholes model and is expensed over the vesting period. The fair value at grant date of the performance shares is determined using the Monte Carlo model and is expensed over the vesting period. The value of the expense is dependent upon certain assumptions including the expected future volatility of the Group’s share price at the grant date and, for the performance shares, the relative performance of the Group’s share price compared with a group of peer companies.

Senior Secured Notes due 2020 (see also Note 20) — The Senior Secured Notes due 2020 are valued at amortized cost. The Senior Secured Notes due 2020 indenture includes specific early redemption clauses. As part of the initial measurement of the amortized costs value of the Senior Secured Notes due 2020 it is assumed that the Notes will be held to maturity. If an early redemption of all or part of the Notes is expected, the liability will be re-measured based on the original effective interest rate. The difference between the liability, excluding a change in assumed early redemption and the liability, including a change in assumed early redemption, will go through the profit and loss.

Functional and presentation currency

Functional and presentation currency

These consolidated financial statements are presented in euro, the Company’s functional and presentation currency. All information presented in euros has been rounded to the nearest thousand, except when stated otherwise.

Basis of consolidation

Basis of consolidation

The consolidated financial statements incorporate the financial statements of the Company and all entities that are directly or indirectly controlled by the Company. Subsidiaries are entities that are controlled by the Group. The Group controls an entity when it is exposed to, or has the right to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of subsidiaries are included in the consolidated financial statements from the date on which control commences until the date on which control ceases.

The accounting policies set out below have been applied consistently by all subsidiaries to all periods presented in these consolidated financial statements.

Loss of control

When the Group loses control over a subsidiary, the Company de-recognizes the assets and liabilities of the subsidiary, any non-controlling interests and the other components of equity related to the subsidiary. Any surplus or deficit arising on the loss of control is recognized in profit or loss.

Transactions eliminated on consolidation

Intercompany balances and transactions, and any unrealized income and expenses arising from intercompany transactions, are eliminated in preparing the consolidated financial statements.

Subsidiaries

With the exception of Stichting Administratiekantoor Management InterXion, all the subsidiary undertakings of the Group, as set out below are wholly owned as of December 31, 2017. Stichting Administratiekantoor is part of the consolidation based on the Group’s control over the entity.

InterXion HeadQuarters B.V., Amsterdam, The Netherlands;

InterXion Nederland B.V., Amsterdam, The Netherlands;

InterXion Trademarks B.V., Amsterdam, The Netherlands;

InterXion Participation 1 B.V., Amsterdam, The Netherlands;

InterXion Österreich GmbH, Vienna, Austria;

InterXion Real Estate VII GmbH, Vienna, Austria;

InterXion Belgium N.V., Brussels, Belgium;

InterXion Real Estate IX N.V., Brussels, Belgium;

InterXion Denmark ApS, Copenhagen, Denmark;

InterXion Real Estate VI ApS, Copenhagen, Denmark;

Interxion France SAS, Paris, France;

Interxion Real Estate II SARL, Paris, France;

Interxion Real Estate III SARL, Paris, France;

Interxion Real Estate XI SARL, Paris, France;

InterXion Deutschland GmbH, Frankfurt, Germany;

InterXion Ireland DAC, Dublin, Ireland;

Interxion Telecom SRL, Milan, Italy;

InterXion España SA, Madrid, Spain;

InterXion Sverige AB, Stockholm, Sweden;

InterXion (Schweiz) AG, Zurich, Switzerland;

InterXion Real Estate VIII AG, Zurich, Switzerland;

InterXion Carrier Hotel Ltd., London, United Kingdom;

InterXion Europe Ltd., London, United Kingdom;

InterXion Real Estate Holding B.V., Amsterdam, The Netherlands;

InterXion Real Estate I B.V., Amsterdam, The Netherlands;

InterXion Real Estate IV B.V., Amsterdam, The Netherlands;

InterXion Real Estate V B.V., Amsterdam, The Netherlands;

InterXion Real Estate X B.V., Amsterdam, The Netherlands;

InterXion Real Estate XII B.V., Amsterdam, The Netherlands;

InterXion Real Estate XIII B.V., Amsterdam, The Netherlands;

InterXion Real Estate XIV B.V., Amsterdam, The Netherlands;

InterXion Science Park B.V., Amsterdam, The Netherlands;

InterXion Operational B.V., Amsterdam, The Netherlands;

InterXion Datacenters B.V., The Hague, The Netherlands (formerly Centennium Detachering B.V.);

InterXion Consultancy Services B.V., Amsterdam, The Netherlands (dormant);

Interxion Telecom B.V., Amsterdam, The Netherlands (dormant);

Interxion Trading B.V., Amsterdam, The Netherlands (dormant);

InterXion B.V., Amsterdam, The Netherlands (dormant);

InterXion Telecom Ltd., London, United Kingdom (dormant);

Stichting Administratiekantoor Management InterXion, Amsterdam, The Netherlands.

Foreign currency

Foreign currency

Foreign currency transactions

The individual financial statements of each Group entity are presented in the currency of the primary economic environment in which the entity operates (its functional currency). For the purpose of the consolidated financial statements, the results and the financial position of each entity are expressed in euros, which is the functional currency of the Company and the presentation currency for the consolidated financial statements.

In preparing the financial statements of the individual entities, transactions in foreign currencies other than the entity’s functional currency are recorded at the rates of exchange prevailing at the dates of the transactions. At each balance sheet date, monetary assets and liabilities denominated in foreign currencies are retranslated at the rates prevailing at the balance sheet date. Non-monetary items that are measured in terms of historical cost in a foreign currency are not retranslated. The income and expenses of foreign operations are translated to euros at average exchange rates.

Foreign operations

For the purpose of presenting consolidated financial statements, the assets and liabilities of the Group’s foreign operations are expressed in euros using exchange rates prevailing at the balance sheet date. Income and expense items are translated at average exchange rates for the period. Exchange differences, if any, arising on net investments including receivables from or payables to a foreign operation for which settlement is neither planned nor likely to occur, are recognized directly in the foreign currency translation reserve (FCTR) within equity. When control over a foreign operation is lost, in part or in full, the relevant amount in the FCTR is transferred to profit or loss.

Borrowing costs

Borrowing costs

Borrowing costs directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time to get ready for their intended use or sale, are added to the cost of those assets, until such time as the assets are substantially ready for their intended use or sale. All other borrowing costs are recognized in profit or loss in the period in which they are incurred.

Borrowing costs are capitalized based on the effective interest rate of the Senior Secured Notes.

Statement of cash flows

Statement of cash flows

The consolidated statement of cash flows is prepared using the indirect method. The cash flow statement distinguishes between operating, investing and financing activities.

Cash flows in foreign currencies are converted at the exchange rate at the dates of the transactions. Currency exchange differences on cash held are separately shown. Payments and receipts of corporate income taxes and interest paid are included as cash flow from operating activities.

Financial instruments

Financial instruments

Derivative financial instruments

Derivatives are initially recognized at fair value; any attributable transaction costs are recognized in profit and loss as they are incurred. Subsequent to initial recognition, derivatives are measured at their fair value, and changes therein are generally recognized in profit and loss.

When a derivative is designated as a cash flow hedging instrument, the effective portion of changes in the fair value of the derivative is recognized in other comprehensive income and accumulated in the hedging reserve. Any ineffective portion of changes in the fair value of the derivative is recognized immediately in profit or loss.

The amount accumulated in equity is retained in other comprehensive income and reclassified to the profit or loss in the same period, or periods, during which the hedged item affects profit or loss.

If the hedging instrument no longer meets the criteria for hedge accounting, expires, is sold, terminated or exercised, or the designation is revoked, hedge accounting is discontinued prospectively. If the forecast transaction is no longer expected to occur, the amount accumulated in equity is reclassified to profit or loss.

Fair values are obtained from quoted market prices in active markets or, where an active market does not exist, by using valuation techniques. Valuation techniques include discounted cash flow models.

Non-derivative financial instruments

Non-derivative financial instruments comprise trade and other receivables, cash and cash equivalents, loans and borrowings, and trade and other payables.

Non-derivative financial instruments are recognized initially at fair value, net of any directly attributable transaction costs. Subsequent to initial recognition, non-derivative financial instruments are measured at amortized cost using the effective interest method, less any impairment losses.

The Group de-recognizes a financial asset when the contractual rights to the cash flows from the asset expire, or it transfers the right to receive the contractual cash flows in a transaction in which substantially all the risk and rewards of ownership of the financial asset are transferred. Any interest in such transferred financial assets that is created or retained by the Group is recognized as a separate asset or liability.

Financial assets and liabilities are offset and the net amount presented in the statement of financial position when, and only when, the Group has a legal right to offset the amounts and intends either to settle on a net basis or to realize the asset and settle the liability simultaneously.

Financial assets are designated as at fair value through profit and loss if the Group manages such investments and makes purchase and sale decisions based on their fair value in accordance with the Group’s risk management or investment strategy. Attributable transaction costs are recognized in profit and loss as incurred. Financial assets at fair value through profit and loss are measured at fair value and changes therein, which takes into account any dividend income, are recognized in profit and loss.

The fair values of investments in equity are determined with reference to their quoted closing bid price at the measurement date or, if unquoted, using a valuation technique.

The convertible loan given, is presented as ‘Other investment’ on the balance sheet. This loan is initially measured at fair value plus any directly attributable transaction costs. Subsequent to initial recognition, it is measured at amortized costs using the effective interest method.

Trade receivables and other current assets

Trade receivables and other current assets are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less provision for impairment.

A provision for impairment of trade receivables and other current assets is established when there is objective evidence that the Group will not be able to collect all amounts due according to the original term of the receivables. Significant financial difficulties of the debtor, probability that the debtor will enter bankruptcy or financial reorganization, and default or delinquency in payments are considered indicators that the trade receivable is impaired.

The amount of the provision is the difference between the asset’s carrying amount and the present value of estimated future cash flows, discounted at the original effective interest rate. The carrying amount of the asset is reduced through the use of an allowance account, and the amount of the loss is recognized in the income statement.

When a trade receivable and other current asset is uncollectable, it is written off against the allowance account for trade receivables. Subsequent recoveries of amounts previously written off are credited in the income statement.

Cash and cash equivalents

Cash and cash equivalents includes cash in hand, deposits held at call with banks and other short-term highly liquid investments with original maturities of three months or less. Cash and cash equivalents, including short-term investments, is valued at face value, which equals its fair value. Collaterized cash is included in other (non-) current assets and accounted for at face value, which equals its fair value.

Trade payables and other current liabilities

Trade payables and other current liabilities are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method.

Share capital

Share capital

Ordinary shares are classified as equity. Incremental costs directly attributable to the issue of ordinary shares and share options are recognized as a deduction from equity, net of any tax effects.

Property, plant and equipment

Property, plant and equipment

Property, plant and equipment are measured at cost less accumulated depreciation and accumulated impairment losses.

Cost includes expenditure that is directly attributable to the acquisition or construction of the asset and comprises purchase cost, together with the incidental costs of installation and commissioning. These costs include external consultancy fees, capitalized borrowing costs, rent and associated costs attributable to bringing the assets to a working condition for their intended use and internal employment costs that are directly and exclusively related to the underlying asset. In case of operating leases where it is probable that the lease contract will not be renewed, the cost of self-constructed assets includes the estimated costs of dismantling and removing the items and restoring the site on which they are located.

When parts of an item of property, plant and equipment have different useful lives, they are accounted for as separate items (major components) of property, plant and equipment.

Gains and losses on disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount of property, plant and equipment and are recognized within income.

The cost of replacing part of an item of property, plant and equipment is recognized in the carrying amount of the item if it is probable that the future economic benefits embodied within the part will flow to the Group and its cost can be measured reliably. The carrying amount of the replaced part is de-recognized. The costs of the day-to-day servicing of property, plant and equipment are recognized in profit or loss as incurred.

Depreciation is calculated from the date an asset becomes available for use and is depreciated on a straight-line basis over the estimated useful life of each part of an item of property, plant and equipment. Leased assets are depreciated on the same basis as owned assets over the shorter of the lease term and their useful lives. The principal periods used for this purpose are:

•  Data center freehold land	Not depreciated
•  Data center buildings	15-30 years
•  Data center infrastructure and equipment	5-20 years
•  Office equipment and other	3-15 years

Depreciation methods, useful lives and residual values are reviewed annually.

Data center freehold land consists of the land owned by the Company and land leased by the Company under finance lease agreements. The data center buildings consist of the core and shell in which we have constructed a data center. Data center infrastructure and equipment comprises data center structures, leasehold improvements, data center cooling and power infrastructure, including infrastructure for advanced environmental controls such as ventilation and air conditioning, specialized heating, fire detection and suppression equipment and monitoring equipment. Office equipment and other is comprised of office leasehold improvements and office equipment consisting of furniture and computer equipment.

Intangible assets and goodwill

Intangible assets and goodwill

Intangible assets represent power grid rights, software and other intangible assets, and are recognized at cost less accumulated amortization and accumulated impairment losses. Other intangible assets principally consist of lease premiums (paid in addition to obtain rental contracts).

Software includes development expenditure, which is capitalized only if development costs can be measured reliably, the product or process is technically and commercially feasible, future economic benefits are probable, and the Group intends to and has sufficient resources to complete development and to use the asset. The expenditure capitalized includes the cost of material, services and direct labor costs that are directly attributable to preparing the asset for its intended use.

Amortization is calculated on a straight-line basis over the estimated useful lives of the intangible asset. Amortization methods, useful lives are reviewed annually.

The estimated useful lives are:

•  Power grid rights	10–15 years
•  Software	3–5 years
•  Other	3–12 years
•  Customer portfolio	20 years

Goodwill represents the goodwill related to business combinations, which is determined based on purchase price allocation. Goodwill is not being amortized, and subject to an annual impairment test.

Impairment of non-financial assets

Impairment of non-financial assets

The carrying amounts of the Group’s non-financial assets, are reviewed at each reporting date to determine whether there is any indication of impairment. If any such indication exists, then the asset’s recoverable amount is estimated. For intangible assets that are not yet available for use, the recoverable amount is estimated annually.

The recoverable amount of an asset or cash-generating unit is the greater of either its value in use or its fair value less costs to sell. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. For the purpose of impairment testing, assets are grouped together into the smallest group of assets that generates cash inflows from continuing use that are largely independent of the cash inflows of other assets or groups of assets (the “cash-generating unit”).

Considering the Company manages its data centers by country, and, given the data center campus-structures, the financial performance of data centers within a country is highly inter-dependent, the Company has determined that the cash-generating unit for impairment-testing purposes should be the group of data centers per country, unless specific circumstances would indicate that a single data center is a cash-generating unit.

An impairment loss is recognized if the carrying amount of an asset or its cash-generating unit exceeds its estimated recoverable amount. Impairment losses are recognized in profit or loss. Impairment losses recognized in respect of cash-generating units are to reduce the carrying amount of the assets in the unit (group of units) on a pro-rata basis.

Impairment losses recognized in prior periods are assessed at each reporting date for any indications that the loss has decreased or no longer exists. An impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss previously recognized on assets other than goodwill, is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized.

Borrowings

Borrowings

Borrowings are recognized initially at fair value, net of transaction costs incurred. Borrowings are subsequently stated at amortized cost; with any difference between the proceeds (net of transaction costs) and the redemption value recognized in the income statement over the period of the borrowings using the effective interest method.

Borrowings are classified as current liabilities unless the Group has an unconditional right to defer settlement of the liability for at least 12 months after the balance sheet date. The Group de-recognizes a borrowing when its contractual obligations are discharged, cancelled or expired.

As part of the initial measurement of the amortized cost value of the Senior Secured Notes due 2020, it is assumed that the Notes will be held to maturity. If an early redemption of all or part of the Notes is expected, the liability will be re-measured based on the original effective interest rate. The difference between the liability, excluding a change in assumed early redemption and the liability, including a change in assumed early redemption, will be recognized in profit and loss.

Provisions

Provisions

A provision is recognized in the statement of financial position when the Group has a present legal or constructive obligation as a result of a past event; it is probable that an outflow of economic benefits will be required to settle the obligation and the amount can be estimated reliably. Provisions are determined by discounting the expected future cash flows at a pre-tax rate that reflects current market assessments of the time value of money and, where appropriate, the risks specific to the liability. The discount rate arising on the provision is amortized in future years through interest.

A provision for site restoration is recognized when costs for restoring leasehold premises to their original condition at the end of the lease are probable to be incurred and it is possible to make an accurate estimate of these costs. The discounted cost of the liability is included in the related assets and is depreciated over the remaining estimated term of the lease. If the likelihood of this liability is estimated to be possible, rather than probable, it is disclosed as a contingent liability in Note 26.

A provision for onerous lease contracts is recognized when the expected benefits to be derived by the Group from a contract are lower than the unavoidable cost of meeting its obligations under the contract. The provision is measured at the discounted amount of future losses expected to be incurred in respect of unused data center sites over the term of the leases. Where unused sites can be sublet or partly sublet, management has taken account of the sublease income expected to be received over the minimum sublease term, which meets the Group’s revenue recognition criteria in arriving at the amount of future losses. Before a provision is established, the Group recognizes any impairment loss on the assets associated with that contract.

Leases

Leases

Leases, in which the Group assumes substantially all the risks and rewards of ownership, are classified as finance leases. On initial recognition, the leased asset is measured at an amount equal to the lower of either its fair value or the present value of the minimum lease payments. Subsequent to initial recognition, the asset is accounted for in accordance with the accounting policy applicable to that asset. The finance lease obligations are presented as part of the long-term liabilities and, as far as amounts need to be repaid within one year, as part of current liabilities.

Other leases are operating leases and the leased assets are not recognized on the Group’s statement of financial position. Payments made under operating leases are recognized in the income statement, or capitalized during construction, on a straight-line basis over the term of the lease. Lease incentives received are recognized as an integral part of the total lease expense, over the term of the lease.

Minimum finance lease payments are apportioned between the finance charge and the reduction of the outstanding liability. The finance charge is allocated to each period during the lease term so as to produce a constant periodic rate of interest on the remaining balance of the liability.

At inception or modification of an arrangement, the Group determines whether such an arrangement is, or contains, a lease. This will be the case if the following two criteria are met:

• the fulfilment of the arrangement is dependent on the use of a specific asset or assets; and

• the arrangement contains the right to use an asset.

For leased properties on which our data centers are located, we generally seek to secure property leases for terms of 20 to 25 years. Where possible, we try to mitigate the long-term financial commitment by contracting for initial lease terms for a minimum period of 10 to 15 years with the option for us either to (i) extend the leases for additional five-year terms or (ii) terminate the leases upon expiration of the initial 10- to 15-year term. Our leases generally have consumer price index based annual rent increases over the full term of the lease. Certain of our leases contain options to purchase the asset.

Segment reporting

Segment reporting

The segments are reported in a manner consistent with internal reporting provided to the chief operating decision-maker, identified as the Board of Directors. There are two segments: the first is France, Germany, The Netherlands and the United Kingdom (the “Big4”), the second is Rest of Europe, which comprises Austria, Belgium, Denmark, Ireland, Spain, Sweden and Switzerland. Shared expenses such as corporate management, general and administrative expenses, loans and borrowings and related expenses and income tax assets and liabilities are stated in Corporate and other. The Big4 and Rest of Europe are different segments as management believes that the Big4 countries represent the largest opportunities for Interxion, from market trends and growth perspective to drive the development of its communities of interest strategy within customer segments and the attraction of magnetic customers. As a result, over the past three years we have invested between 68% and 70% of our capital expenditure in the Big4 segment while revenue constituted an average of 64% of total revenue over the same period.

Segment results, assets and liabilities include items directly attributable to a segment as well as those that can be allocated on a reasonable basis. Unallocated items presented as Corporate and other principally comprise loans and borrowings and related expenses; corporate assets and expenses (primarily the Company’s headquarters); and income tax assets and liabilities.

Segment capital expenditure is defined as the net cash outflow during the period to acquire property, plant and equipment, and intangible assets other than goodwill, during the period.

Non-IFRS Financial Measures

Non-IFRS Financial Measures

Adjusted EBITDA, Recurring revenue and Cash generated from operations, are additional indicators of our operating performance, and are not required by or presented in accordance with IFRS. We define Adjusted EBITDA as Operating income adjusted for the following items, which may occur in any period, and which management believes are not representative of our operating performance:

• Depreciation and amortization – property, plant and equipment and intangible assets (except goodwill) are depreciated on a straight-line basis over the estimated useful life. We believe that these costs do not represent our operating performance.

• Share-based payments – primarily the fair value at the grant date to employees of equity awards, is recognized as an employee expense over the vesting period. We believe that this expense does not represent our operating performance.

• Income or expense related to the evaluation and execution of potential mergers or acquisitions (“M&A”) – under IFRS, gains and losses associated with M&A activity are recognized in the period incurred. We exclude these effects because we believe they are not reflective of our on-going operating performance.

• Adjustments related to terminated and unused data center sites – these gains and losses relate to historical leases entered into for certain brownfield sites, with the intention of developing data centers, which were never developed and for which management has no intention of developing into data centers. We believe the impact of gains and losses related to unused data centers are not reflective of our business activities and our on-going operating performance.

In certain circumstances, we may also adjust for items that management believes are not representative of our current on-going performance. Examples of this would include: adjusting for the cumulative effect of a change in accounting principle or estimate, impairment losses, litigation gains and losses or windfall gains and losses.

We define Recurring revenue as revenue incurred monthly from colocation, connectivity and associated power charges, office space, amortized set-up fees and certain recurring managed services (but excluding any ad hoc managed services) provided by us directly or through third parties, excluding rents received for the sublease of unused sites.

Cash generated from operations is defined as net cash flows from operating activities, excluding interest and corporate income tax payments and receipts. Management believe that the exclusion of these items, provides useful supplemental information to net cash flows from operating activities to aid investors in evaluating the cash generating performance of our business.

We believe Adjusted EBITDA, Recurring revenue and Cash generated from operations provide useful supplemental information to investors regarding our on-going operational performance. These measures help us and our investors evaluate the on-going operating performance of the business after removing the impact of our capital structure (primarily interest expense) and our asset base (primarily depreciation and amortization). Management believes that the presentation of Adjusted EBITDA, when combined with the primary IFRS presentation of net income, provides a more complete analysis of our operating performance. Management also believes the use of Adjusted EBITDA facilitates comparisons between us and other data center operators (including other data center operators that are REITs) and other infrastructure-based businesses. Adjusted EBITDA is also a relevant measure used in the financial covenants of our 2017 Senior Secured Revolving Facility, our 2013 Super Senior Revolving Facility and our 6.00% Senior Secured Notes due 2020.

This information, provided to the chief operating decision-maker, is disclosed to permit a more complete analysis of our operating performance. Exceptional items are those significant items that are separately disclosed by virtue of their size, nature or incidence to enable a full understanding of the Group’s financial performance.

Revenue recognition

Revenue recognition

Revenue is recognized when it is probable that future economic benefits will flow to the Group and that these benefits, together with their related costs, can be measured reliably. Revenue is measured at the fair value of the consideration received or receivable taking into account any discounts or volume rebates.

The Group reviews transactions for separately identifiable components and, if necessary, applies individual recognition treatment, revenues are allocated to separately identifiable components based on their relative fair values.

The Group earns colocation revenue as a result of providing data center services to customers at its data centers. Colocation revenue and lease income are recognized in profit or loss on a straight-line basis over the term of the customer contract. Incentives granted are recognized as an integral part of the total income, over the term of the customer contract. Customers are usually invoiced quarterly in advance and income is recognized on a straight-line basis over the quarter. Initial setup fees payable at the beginning of customer contracts are deferred at inception and recognized in the income statement on a straight-line basis over the initial term of the customer contract. Power revenue is recognized based on customers’ usage.

Other services revenue, including managed services, connectivity and customer installation services including equipment sales are recognized when the services are rendered. Certain installation services and equipment sales, which by their nature have a non-recurring character, are presented as Non-recurring revenues and are recognized on delivery of service.

Deferred revenues relating to invoicing in advance and initial setup fees are carried on the statement of financial position as part of trade payables and other liabilities. Deferred revenues due to be recognized after more than one year are held in non-current liabilities.

Cost of sales

Cost of sales

Cost of sales consists mainly of rental costs for the data centers and offices, power costs, maintenance costs relating to the data center equipment, operation and support personnel costs and costs related to installations and other customer requirements. In general, maintenance and repairs are expensed as incurred. In cases where maintenance contracts are in place, the costs are recorded on a straight-line basis over the contractual period.

Sales and marketing costs

Sales and marketing costs

The operating expenses related to sales and marketing consist of costs for personnel (including sales commissions), marketing and other costs directly related to the sales process. Costs of advertising and promotion are expensed as incurred.

General and administrative costs

General and administrative costs

General and administrative costs are expensed as incurred and include amortization and depreciation expenses.

Employee benefits

Employee benefits

Defined contribution pension plans

A defined contribution pension plan is a post-employment plan under which an entity pays fixed contributions into a separate entity and has no legal or constructive obligation to pay further amounts. Obligations for contributions to defined contribution plans are recognized as an employee benefit expense in the income statement in the periods during which the related services are rendered by employees. Prepaid contributions are recognized as an asset to the extent that a cash refund or a reduction in future payments is available. Contributions to a defined contribution plan, which are due more than 12 months after the end of the period in which the employees render the service, are discounted to their present value.

Termination benefits

Termination benefits are recognized as an expense when the Group is demonstrably committed, without realistic possibility of withdrawal, to a formal detailed plan to either terminate employment before the normal retirement date, or to provide termination benefits as a result of an offer made to encourage voluntary redundancy. Termination benefits for voluntary redundancy are recognized as an expense if the Group has made an offer of voluntary redundancy, it is probable that the offer will be accepted, and the number of acceptances can be estimated reliably. If benefits are payable more than 12 months after the reporting date, they are discounted to their present value.

Share-based payments

The long-term incentive plans enable Group employees to earn and/or acquire shares of the Group. The fair value at the grant date to employees of share options, as determined using the Black Scholes model for options and the Monte Carlo model for the performance shares, is recognized as an employee expense, with a corresponding increase in equity, over the period that the employees become unconditionally entitled to the options and/or shares. Restricted shares are valued based on the market value at grant date. The amount recognized as an expense is adjusted to reflect the actual number of share options, restricted and performance shares that vest.

Finance income and expense

Finance income and expense

Finance expense includes interest payable on borrowings calculated using the effective interest rate method, gains on financial assets recognized at fair value through profit and loss and foreign exchange gains and losses. Borrowing costs directly attributable to the acquisition or construction of data center assets, which are assets that necessarily take a substantial period of time to get ready for their intended use, are added to the costs of those assets, until such time as the assets are ready for their intended use.

Interest income is recognized in the income statement as it accrues, using the effective interest method. The interest expense component of finance lease payments is recognized in the income statement using the effective interest rate method.

Foreign currency gains and losses are reported on a net basis, as either finance income or expenses, depending on whether the foreign currency movements are in a net gain or a net loss position.

Income tax

Income tax

Income tax on the profit or loss for the year comprises current and deferred tax. Income tax is recognized in the income statement except to the extent that it relates to items recognized directly in equity, in which case it is recognized in equity.

Current tax is the expected tax payable on the taxable income for the year, using tax rates enacted or substantially enacted at the balance sheet date, and any adjustment to tax payable in respect of previous years.

Deferred tax is recognized in respect of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. The following temporary differences are not provided for: the initial recognition of assets or liabilities that affect neither accounting nor taxable profit, nor differences relating to investments in subsidiaries to the extent that they will probably not reverse in the foreseeable future. The amount of deferred tax provided is based on the expected manner of realization or settlement of the carrying amount of assets and liabilities, using tax rates enacted or substantively enacted at the balance sheet date that are expected to be applied to temporary differences when they reverse or loss carry forwards when they are utilized.

A deferred tax asset is also recognized for unused tax losses and tax credits. A deferred tax asset is recognized only to the extent that it is probable that future taxable profits will be available against which the asset can be utilized. Deferred tax assets are reduced to the extent that it is no longer probable that the related tax benefit will be realized.

Additional income taxes that arise from the distribution of dividends are recognized at the same time as the liability to pay the related dividend.

In determining the amount of current and deferred tax, the Company takes into account the impact of uncertain tax positions and whether additional taxes, penalties and interest may be due. The Company believes that its accruals for tax liabilities are adequate for all open tax years based on its assessment of many factors, including interpretations of tax law and prior experience. This assessment relies on estimates and assumptions and may involve a series of judgments about future events. New information may become available that causes the Company to change its judgment regarding the adequacy of existing tax liabilities; such changes to tax liabilities will have an impact on tax expense in the period that such a determination is made.

Deferred tax assets and liabilities are offset if there is a legally enforceable right to offset current tax liabilities and assets, and they relate to taxes levied by the same tax authority on the same taxable entity, or on different tax entities, but they intend to settle current tax liabilities and assets on a net basis of their tax assets and liabilities will be realized simultaneously.

Earnings per share

Earnings per share

The Group presents basic and diluted earnings per share (EPS) data for its ordinary shares. Basic EPS is calculated by dividing the profit or loss attributable to ordinary and preference shareholders of the Company by the weighted average number of ordinary shares outstanding during the year. Diluted EPS is determined by adjusting the basic earnings per share for the effects of all dilutive potential ordinary shares, which comprise the share options granted.

New standards and interpretations not yet adopted

New standards and interpretations not yet adopted

The new standards, amendments to standards and interpretations listed below are available for early adoption in the annual period beginning January 1, 2017, although they are not mandatory until a later period. The Group has decided not to adopt these new standards or interpretations until a later point in time.

Effective date	New standard or amendments
Deferred indefinitely	Amendments to IFRS 10 and IAS 28: Sale or contribution of assets between an investor and its associate or joint venture
January 1, 2018	IFRS 15 – Revenue from Contracts with Customers;
January 1, 2018	IFRS 9 – Financial Instruments;
January 1, 2018	Amendments to IFRS 2: Classification and measurement of share-based payment transactions;
January 1, 2019	IFRS 16 – Leases.

IFRS 9 - Financial Instruments

IFRS 9 – Financial Instruments

IFRS 9 contains a new classification and measurement approach for financial assets that reflects the business model in which assets are managed and their cash flow characteristics. IFRS 9 contains three principal classification categories for financial assets: measured at amortized cost, at fair value through other comprehensive income (“FVOCI”) and at fair value through profit and loss (“FVTPL”). The standard eliminates the existing IAS 39 categories of held to maturity, loans and receivables and available for sale.

Under IFRS 9, derivatives embedded in contracts where the host is a financial asset in the scope of the standard are never bifurcated. Instead, the hybrid financial instrument as a whole is assessed for classification.

Based on its assessment, the Company does not believe that the new classification requirements will have a material impact on its accounting for financial instruments.

When implementing IFRS 9, the Company will take advantage of the exemption allowing it not to restate comparative information for prior periods with respect to classification and measurement.

IFRS 15 - Revenue from Contracts with Customers

IFRS 15 – Revenue from Contracts with Customers

In 2014, the IASB issued IFRS 15 Revenue from Contracts with Customers. This standard specifies how and when revenue is recognized, and includes enhanced disclosure requirements.

IFRS 15 replaces existing revenue recognition standards IAS 11 Construction Contracts and IAS 18 Revenue, and certain revenue-related interpretations. The Group will implement IFRS 15 using the modified retrospective method.

The new standard provides a single, principles based five-step model to be applied to all contracts with customers. The core principle of IFRS 15 is that an entity recognizes revenue related to the transfer of promised goods or services when control of the goods or services passes to the customer. The amount of revenue recognized should reflect the consideration to which the entity expects to be entitled in exchange for those goods or services.

We have completed our assessment of the impact of the adoption of IFRS 15 and concluded that the new standard will have no significant financial impact. This is due to the fact that we concluded that the services provided to our customers do meet the requirements to apply the series guidance under IFRS 15. Under the new standard, a series of distinct goods or services will be accounted for as a single performance obligation if they are substantially the same, have the same pattern of transfer and both of the following criteria are met:

(i) each distinct good or service in the series represents a performance obligation that would be satisfied over time; and

(ii) the entity would measure its progress towards satisfaction of the performance obligation using the same measure of progress for each distinct good or service in the series.

The principles in the new revenue standard are therefore applied to the single performance obligation as the series criteria are met, rather than the individual services that make up the single performance obligation. As a result, revenue is allocated to the relative standalone selling price of the series as one performance obligation, rather than to each distinct service within it.

We have determined that the measure of progress for the single performance obligation that best depicts the transfer of the services is the one-month (time) increment. By applying the series guidance on such basis Interxion revenues will be recognized on a monthly basis in line with the satisfaction of the monthly increment of service which is in line with current accounting for these revenues.

IFRS 16 - Leases

IFRS 16 - Leases

In January 2016, the International Accounting Standards Board (IASB) issued IFRS 16 Leases, the new accounting standard for leases. The new standard is effective for annual periods beginning on or after 1 January 2019 and will replace IAS 17 Leases and IFRIC 4 Determining whether an Arrangement contains a Lease. IFRS 16 has been endorsed by the EU in October 2017.

The new standard requires lessees to apply a single, on-balance sheet accounting model to all its leases, unless a lessee elects the recognition exemptions for short-term leases and/or leases of low-value assets. A lessee must recognize a right-of-use asset representing its right to use the underlying asset and a lease obligation representing its obligation to make lease payments. The standard permits a lessee to elect either a full retrospective or a modified retrospective transition approach.

The Company is investigating whether certain elements of its contracts with customers will be subject to lessor accounting under the requirements of IFRS 16. Generally, the impact on the income statement is that operating lease expenses will no longer be recognized. The impact of lease contracts on the consolidated income, which is currently part of the operating expenses, will be included in amortization (related to the right of use asset) and interest (related to the lease liability). As a result, key metrics such as operating profit and Adjusted EBITDA are likely to change significantly. Compared to current lease accounting, total expenses will be higher in the earlier years of a lease and lower in the later years. The impact on the consolidated statement of cash flows will be visible in higher Net cash flows from operating activities, since cash payments allocated to the repayment of the lease liability will be included in Net cash flow from financing activities.

We are in the process of assessing the impact of IFRS 16 on the consolidated financial statements. We are not yet in the position to conclude on this. However, based on the work we have done so far, based on current lease commitments of EUR 361 million (see note 24), this standard is likely to have a material impact on the measurement of assets and liabilities and on classifications in the Consolidated income statement and Consolidated statement of cash flows.

These new principles will be applied by Interxion from the annual reporting period starting on 1 January 2019. The Group has elected to apply the recognition exemptions that are allowed under the modified retrospective transition method.

We expect to be in a position to give more detail and an indication of potential impact during 2018.

XML

Significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Disclosure of Detailed Information about Property, Plant and Equipment

Depreciation is calculated from the date an asset becomes available for use and is depreciated on a straight-line basis over the estimated useful life of each part of an item of property, plant and equipment. Leased assets are depreciated on the same basis as owned assets over the shorter of the lease term and their useful lives. The principal periods used for this purpose are:

•  Data center freehold land	Not depreciated
•  Data center buildings	15-30 years
•  Data center infrastructure and equipment	5-20 years
•  Office equipment and other	3-15 years

Disclosure of Detailed Information about Intangible Assets

Amortization is calculated on a straight-line basis over the estimated useful lives of the intangible asset. Amortization methods, useful lives are reviewed annually.

The estimated useful lives are:

•  Power grid rights	10–15 years
•  Software	3–5 years
•  Other	3–12 years
•  Customer portfolio	20 years

Disclosure of Expected Impact of Initial Application of New Standards or Interpretations

The new standards, amendments to standards and interpretations listed below are available for early adoption in the annual period beginning January 1, 2017, although they are not mandatory until a later period. The Group has decided not to adopt these new standards or interpretations until a later point in time.

Effective date	New standard or amendments
Deferred indefinitely	Amendments to IFRS 10 and IAS 28: Sale or contribution of assets between an investor and its associate or joint venture
January 1, 2018	IFRS 15 – Revenue from Contracts with Customers;
January 1, 2018	IFRS 9 – Financial Instruments;
January 1, 2018	Amendments to IFRS 2: Classification and measurement of share-based payment transactions;
January 1, 2019	IFRS 16 – Leases.

XML

Information by segment (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Entity-wide disclosures

The geographic information analyzes the Group’s revenues and non-current assets by country of domicile and other individually material countries. In presenting the geographic information, both revenue and assets excluding deferred tax assets and financial instruments are based on geographic location.

	Revenues						Non-current assets excluding deferred tax assets and financial instruments
	(€’000)						(€’000)
	2017		2016		2015		2017		2016		2015
France		86,180		68,816		62,007		261,558		223,917		189,926
Germany		106,069		84,449		68,568		374,893		281,935		231,309
The Netherlands		80,411		70,678		65,225		373,390		286,604		235,270
United Kingdom		45,977		45,831		51,114		87,955		81,156		96,747
Other countries		170,665		152,014		139,646		350,624		316,644		272,771
Total		489,302		421,788		386,560		1,448,420		1,190,256		1,026,023

Disclosure of Information by Segment

Information by segment, 2017

	FR, DE, NL and UK			Rest of Europe			Subtotal			Corporate and other			Total
	(€’000)
Recurring revenue		302,346			160,170			462,516			—			462,516
Non-recurring revenue		16,291			10,495			26,786			—			26,786
Total revenue		318,637			170,665			489,302			—			489,302
Cost of sales		(119,931	)		(57,810	)		(177,741	)		(12,730	)		(190,471	)
Gross profit/(loss)		198,706			112,855			311,561			(12,730	)		298,831
Other income		97			—			97			—			97
Sales and marketing costs		(9,780	)		(5,891	)		(15,671	)		(17,794	)		(33,465	)
General and administrative costs		(87,903	)		(37,045	)		(124,948	)		(42,242	)		(167,190	)
Operating income		101,120			69,919			171,039			(72,766	)		98,273
Net Finance expense														(44,367	)
Profit before taxation														53,906
Total assets		1,229,960			393,644			1,623,604			78,467			1,702,071
Total liabilities		267,751			77,505			345,256			760,087			1,105,343
Capital expenditures, including intangible assets*		(174,818	)		(69,832	)		(244,650	)		(11,365	)		(256,015	)
Depreciation, amortization and impairments		72,721			29,365			102,086			6,166			108,252
Adjusted EBITDA(1)		174,818			99,665			274,483			(53,522	)		220,961

Information by segment, 2016

	FR, DE, NL and UK			Rest of Europe			Subtotal			Corporate and other(i)			Total
	(€’000)
Recurring revenue		256,004			143,954			399,958			—			399,958
Non-recurring revenue		13,770			8,060			21,830			—			21,830
Total revenue		269,774			152,014			421,788			—			421,788
Cost of sales		(100,921	)		(51,769	)		(152,690	)		(9,878	)		(162,568	)
Gross profit/(loss)		168,853			100,245			269,098			(9,878	)		259,220
Other income		333			—			333			—			333
Sales and marketing costs		(8,390	)		(5,209	)		(13,599	)		(16,342	)		(29,941	)
General and administrative costs		(73,238	)		(32,632	)		(105,870	)		(32,687	)		(138,557	)
Operating income		87,558			62,404			149,962			(58,907	)		91,055
Net Finance expense														(36,269	)
Profit before taxation														54,786
Total assets		990,406			363,444			1,353,850			128,815			1,482,665
Total liabilities		202,330			73,613			275,943			657,953			933,896
Capital expenditures, including intangible assets*		(170,707	)		(69,650	)		(240,357	)		(10,521	)		(250,878	)
Depreciation, amortization and impairments		60,128			25,371			85,499			4,336			89,835
Adjusted EBITDA(1)		148,191			88,195			236,386			(45,510	)		190,876

Information by segment, 2015

	FR, DE, NL and UK			Rest of Europe			Subtotal			Corporate and other(i)			Total
	(€’000)
Recurring revenue		232,624			132,551			365,175			—			365,175
Non-recurring revenue		14,290			7,095			21,385			—			21,385
Total revenue		246,914			139,646			386,560			—			386,560
Cost of sales		(93,311	)		(49,440	)		(142,751	)		(8,862	)		(151,613	)
Gross profit/(loss)		153,603			90,206			243,809			(8,862	)		234,947
Other income		365			—			365			20,923			21,288
Sales and marketing costs		(7,925	)		(5,145	)		(13,070	)		(15,147	)		(28,217	)
General and administrative costs		(62,828	)		(30,687	)		(93,515	)		(40,876	)		(134,391	)
Operating income		83,215			54,374			137,589			(43,962	)		93,627
Net Finance expense														(29,022	)
Profit before taxation														64,605
Total assets		878,568			309,218			1,187,786			64,278			1,252,064
Total liabilities		196,996			54,396			251,392			493,255			744,647
Capital expenditures, including intangible assets*		(131,812	)		(55,004	)		(186,816	)		(5,820	)		(192,636	)
Depreciation, amortization and impairments		50,317			23,688			74,005			4,224			78,229
Adjusted EBITDA(1)		134,328			78,868			213,196			(41,920	)		171,276

Note:— * Capital expenditure, including intangible assets, represent payments to acquire property, plant and equipment and intangible assets, as recorded in the consolidated statement of cash flows as “Purchase of property, plant and equipment” and “Purchase of intangible assets” respectively.

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Summary of Detailed Information about Reconciliation to Adjusted EBITDA

Reconciliation to Adjusted EBITDA

Consolidated

	2017			2016(i)			2015(i)
	(€’000)
Net income		39,067			38,336			46,680
Income tax expense		14,839			16,450			17,925
Profit before taxation		53,906			54,786			64,605
Finance income		(1,411	)		(1,206	)		(5,742	)
Finance expense		45,778			37,475			34,764
Operating income		98,273			91,055			93,627
Depreciation, amortization and impairments		108,252			89,835			78,229
Share-based payments		9,929			7,890			9,047
Increase/(decrease) in provision for onerous lease contracts(4)		—			—			(184	)
M&A transaction break fee income(2)		—			—			(20,923	)
M&A transaction costs(3)		4,604			2,429			11,845
Income from sub-leases on unused data center sites(5)		(97	)		(95	)		(365	)
Increase/(decrease) in provision for site restoration(6)		—			(238	)		—
Adjusted EBITDA(1)		220,961			190,876			171,276

France, Germany, The Netherlands and the United Kingdom

	2017			2016			2015
	(€’000)
Operating income		101,120			87,558			83,215
Depreciation, amortization and impairments		72,721			60,128			50,317
Share-based payments		1,074			838			1,345
Increase/(decrease) in provision for onerous lease contracts(4)		—			—			(184	)
Income from sub-leases on unused data center sites(5)		(97	)		(95	)		(365	)
Increase/(decrease) in provision for site restoration(6)		—			(238	)		—
Adjusted EBITDA(1)		174,818			148,191			134,328

Rest of Europe

	2017		2016		2015
	(€’000)
Operating income		69,919		62,404		54,374
Depreciation, amortization and impairments		29,365		25,371		23,688
Share-based payments		381		420		806
Adjusted EBITDA(1)		99,665		88,195		78,868

Corporate and other

	2017			2016(i)			2015(i)
	(€’000)
Operating income		(72,766	)		(58,907	)		(43,962	)
Depreciation, amortization and impairments		6,166			4,336			4,224
Share-based payments		8,474			6,632			6,896
M&A transaction break fee income(2)		—			—			(20,923	)
M&A transaction costs(3)		4,604			2,429			11,845
Adjusted EBITDA(1)		(53,522	)		(45,510	)		(41,920	)

Notes:

1) “Adjusted EBITDA” is a non-IFRS financial measure within the meaning of the rules of the SEC. See “Non-IFRS Financial Measures” for more information on this measure, including why we believe that this supplemental measure is useful, and the limitations on the use of this supplemental measure.

2) “M&A transaction break fee income” represents the cash break up fee received following the termination of the Implementation Agreement in May 2015. This fee was included in “Other income”.

3) “M&A transaction costs” are costs associated with the evaluation, diligence and conclusion or termination of merger or acquisition activity. These costs are included in “General and administrative costs”.

4) “Increase/(decrease) in provision for onerous lease contracts” relates to those contracts in which we expect losses to be incurred in respect of unused data center sites over the term of the lease contract. This item is treated as ”General and administrative costs”.

5) “Income from sub-leases of unused data center sites” represents the income on sub-lease of portions of unused data center sites to third parties. This income is treated as ”Other income”.

6) “Increase/(decrease) in provision for site restoration” represents income or expense related to the termination of data center sites. This item is treated as ”Other income”.

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

General and administrative costs (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of General and Administrative Costs

The general and administrative costs consist of the following components:    

	2017		2016(i)		2015(i)
	(€’000)
Depreciation, amortization and impairments		108,252		89,835		78,229
Share-based payments		9,929		7,890		9,047
(Increase)/decrease in provision for onerous lease contracts		—		—		(184	)
M&A transaction costs		4,604		2,429		11,845
Employee benefit expenses (excluding share-based payments)		16,918		16,279		16,395
Other general and administrative costs		27,487		22,124		19,059
		167,190		138,557		134,391

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Employee benefit expenses (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Employee Benefits Expense

The Group employed an average of 638 employees (full-time equivalents) during 2017 (2016: 574 and 2015: 515). Costs incurred in respect of these employees were:

	2017		2016(i)		2015(i)
	(€’000)
Salaries and bonuses		50,580		44,556		42,333
Social security charges		8,147		7,113		6,780
Contributions to defined contribution pension plans		3,063		2,571		2,273
Other personnel-related costs		8,572		7,844		7,518
Share-based payments		9,929		7,890		9,047
		80,291		69,974		67,951

Employee Benefit Expense Under Income Statement

The following income statement line items include employee benefit expenses of:    

	2017		2016(i)		2015(i)
	(€’000)
Costs of sales		31,877		26,539		24,930
Sales and marketing costs		21,567		19,274		17,580
General and administrative costs		26,847		24,161		25,441
		80,291		69,974		67,951

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Finance income and expense (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Finance Income And Expense Details

	2017			2016			2015
	(€’000)
Bond premium and fees in income		1,188			790			—
Bank and other interest		223			135			82
Profit from sale of financial asset		—			281			2,289
Net foreign currency exchange gain		—			—			923
Finance income		1,411			1,206			3,294
Interest expense on Senior Secured Notes, bank and other loans		(37,706	)		(33,095	)		(27,094	)
Interest expense on finance leases		(3,667	)		(1,750	)		(3,139	)
Interest expense on provision for onerous lease contracts		—			(16	)		(115	)
Other financial expenses		(2,707	)		(1,765	)		(1,968	)
Net foreign currency exchanges loss		(1,698	)		(849	)		—
Finance expense		(45,778	)		(37,475	)		(32,316	)
Net finance expense		(44,367	)		(36,269	)		(29,022	)

XML

Income taxes (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Income Tax Expense

Income tax expense

	2017			2016			2015
	(€’000)
Current taxes		(13,814	)		(11,421	)		(9,170	)
Deferred taxes		(1,025	)		(5,029	)		(8,755	)
Total income tax expense		(14,839	)		(16,450	)		(17,925	)

Summary of Reconciliation of Effective Tax Rate

A reconciliation between income taxes calculated at the Dutch statutory tax rate of 25% in 2017 (25% in 2016 and 2015) and the actual tax benefit/(expense) with an effective tax rate of 27.5% (30.0% in 2016 and 27.7% in 2015) is as follows:

	2017			2016(i)			2015(i)
	(€’000)
Net income		39,067			38,336			46,680
Income tax expense		14,839			16,450			17,925
Profit before taxation		53,906			54,786			64,605
Income tax using Company’s domestic tax rate		(13,477	)		(13,697	)		(16,151	)
Effect of tax rates in foreign jurisdictions		(99	)		(844	)		(407	)
Change in tax rate and legislation		554			367			548
Non-deductible expenses		(2,496	)		(2,197	)		(2,420	)
Recognition of previously unrecognized tax losses		—			147			734
Prior year adjustments included in current year tax		201			(354	)		211
Other		478			128			(440	)
Income tax expense		(14,839	)		(16,450	)		(17,925	)

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Summary of Movement in Recognized Deferred Tax Assets

The movement in recognized deferred tax assets during the year is as follows:

	Property, plant and equipment, and Intangibles			Provision onerous contracts			Other			Tax loss carry- forward			Total
	(€’000)
January 1, 2015		13,428			1,575			3,344			22,912			41,259
Recognized in profit/(loss) for 2015		(858	)		(1,091	)		(1,021	)		(3,553	)		(6,523	)
Recognized in equity		—			—			—			(1,224	)		(1,224	)
Effects of movements in exchange rates		11			—			—			221			232
December 31, 2015		12,581			484			2,323			18,356			33,744
Recognized in profit/(loss) for 2016		(348	)		(484	)		(562	)		(3,071	)		(4,465	)
Recognized in equity		—			—			—			1,835			1,835
Effects of movements in exchange rates		1			—			1			(123	)		(121	)
December 31, 2016		12,234			—			1,762			16,997			30,993
Recognized in profit/(loss) for 2017		(1,119	)		—			334			2,355			1,570
Recognized in equity		—			—			(37	)		205			168
Acquisitions		1,779			—			70			915			2,764
Effects of movements in exchange rates		(10	)		—			(31	)		(89	)		(130	)
December 31, 2017		12,884			—			2,098			20,383			35,365
Offset deferred tax liabilities		(6,045	)		—			(1,608	)		(3,242	)		(10,895	)
Net deferred tax assets/(liabilities)		6,839			—			490			17,141			24,470

Summary of Movement in Recognized Deferred Tax Liability

The movement in recognized deferred tax liabilities during the year is as follows:

	Property, plant and equipment, and Intangibles			Provision onerous contracts		Other			Tax loss carry- forward		Total
	(€’000)
January 1, 2015		(17,118	)		—		(1,106	)		—		(18,224	)
Recognized in profit/(loss) for 2015		(2,038	)		—		(194	)		—		(2,232	)
Effects of movements in exchange rates		(215	)		—		—			—		(215	)
December 31, 2015		(19,371	)		—		(1,300	)		—		(20,671	)
Recognized in profit/(loss) for 2016		(508	)		—		(56	)		—		(564	)
Effects of movements in exchange rates		984			—		—			—		984
December 31, 2016		(18,895	)		—		(1,356	)		—		(20,251	)
Recognized in profit/(loss) for 2017		(2,900	)		—		305			—		(2,595	)
Acquisitions		(9,569	)		—		—			—		(9,569	)
Effects of movements in exchange rates		184			—		—			—		184
December 31, 2017		(31,180	)		—		(1,051	)		—		(32,231	)
Offset deferred tax assets		6,045			—		1,608			3,242		10,895
Net deferred tax assets/(liabilities)		(25,135	)		—		557			3,242		(21,336	)

Details of Net Deferred Tax Assets

The following net deferred tax assets have not been recognized:

	2017		2016		2015
	(€’000)
Deductible temporary differences, net		—		—		34
Tax losses		—		—		180
		—		—		214

Summary of Accumulated Recognized and Unrecognized Tax Losses

The accumulated recognized and unrecognized tax losses expire as follows:

	2017		2016		2015
	(€’000)
Within one year		—		—		2,683
Between 1 and 5 years		25,352		3,517		3,490
After 5 years		35,164		28,146		25,817
Unlimited		27,748		47,081		57,721
		88,264		78,744		89,711

XML

Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Property, Plant and Equipment

	Freehold land and buildings			Infrastructure and equipment			Assets under construction			Total data center assets			Office equipment and other			Total
				(€’000)
Cost:
As at January 1, 2017		176,421			1,315,971			111,803			1,604,195			46,761			1,650,956
Additions		28,712			83,216			160,004			271,932			8,765			280,697
Acquisitions through business combinations		5,440			11,272			—			16,712			109			16,821
Exchange differences		(1	)		(11,181	)		(1,020	)		(12,202	)		(510	)		(12,712	)
Disposals		—			(2,045	)		—			(2,045	)		(60	)		(2,105	)
Transfers		17,143			137,207			(154,350	)		—			—			—
As at December 31, 2017		227,715			1,534,440			116,437			1,878,592			55,065			1,933,657
Accumulated depreciation and impairment:
As at January 1, 2017		(16,237	)		(452,054	)		—			(468,291	)		(26,634	)		(494,925	)
Depreciation		(4,861	)		(91,912	)		—			(96,773	)		(6,812	)		(103,585	)
Exchange differences		—			5,050			—			5,050			333			5,383
Disposals		—			1,881			—			1,881			60			1,941
As at December 31, 2017		(21,098	)		(537,035	)		—			(558,133	)		(33,053	)		(591,186	)
Carrying amount as at December 31, 2017		206,617			997,405			116,437			1,320,459			22,012			1,342,471
Cost:
As at January 1, 2016		174,935			1,127,883			77,664			1,380,482			38,219			1,418,701
Additions		—			64,369			184,603			248,972			9,274			258,246
Exchange differences		6			(17,010	)		(2,454	)		(19,458	)		(501	)		(19,959	)
Disposals		—			(5,801	)		—			(5,801	)		(231	)		(6,032	)
Transfers		1,480			146,530			(148,010	)		—			—			—
As at December 31, 2016		176,421			1,315,971			111,803			1,604,195			46,761			1,650,956
Accumulated depreciation and impairment:
As at January 1, 2016		(12,652	)		(385,095	)		—			(397,747	)		(21,882	)		(419,629	)
Depreciation		(3,584	)		(78,680	)		—			(82,264	)		(5,302	)		(87,566	)
Exchange differences		(1	)		5,920			—			5,919			319			6,238
Disposals		—			5,801			—			5,801			231			6,032
As at December 31, 2016		(16,237	)		(452,054	)		—			(468,291	)		(26,634	)		(494,925	)
Carrying amount as at December 31, 2016		160,184			863,917			111,803			1,135,904			20,127			1,156,031
Cost:
As at January 1, 2015		168,505			962,405			74,758			1,205,668			29,951			1,235,619
Additions		6,437			13,113			140,637			160,187			8,404			168,591
Exchange differences		(7	)		14,889			966			15,848			537			16,385
Disposals					(1,221	)		—			(1,221	)		(673	)		(1,894	)
Transfers		—			138,697			(138,697	)		—			—			—
As at December 31, 2015		174,935			1,127,883			77,664			1,380,482			38,219			1,418,701
Accumulated depreciation and impairment:
As at January 1, 2015		(9,270	)		(313,282	)		—			(322,552	)		(17,883	)		(340,435	)
Depreciation		(3,382	)		(67,561	)		—			(70,943	)		(4,333	)		(75,276	)
Exchange differences		—			(5,332	)		—			(5,332	)		(321	)		(5,653	)
Disposals		—			1,080			—			1,080			655			1,735
As at December 31, 2015		(12,652	)		(385,095	)		—			(397,747	)		(21,882	)		(419,629	)
Carrying amount as at December 31, 2015		162,283			742,788			77,664			982,735			16,337			999,072

XML

Intangible assets and goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Intangible Assets

	Power grid rights			Software			Goodwill		Customer portfolio			Other			Total
	(€’000)
Cost:
As at January 1, 2017		18,582			21,519			—		—			2,165			42,266
Additions		3,466			5,326			—		—			—			8,792
Acquisitions through business combinations		—			—			38,900		28,005			—			66,905
Exchange differences		(228	)		(35	)		—		—			—			(263	)
Disposals		—			—			—		—			—			—
As at December 31, 2017		21,820			26,810			38,900		28,005			2,165			117,700
Accumulated amortization and impairment:
As at January 1, 2017		(2,232	)		(9,816	)		—		—			(1,524	)		(13,572	)
Amortization		(773	)		(2,619	)		—		(1,167	)		(108	)		(4,667	)
Exchange differences		—			32			—		—			—			32
Disposals		—			—			—		—			—			—
As at December 31, 2017		(3,005	)		(12,403	)		—		(1,167	)		(1,632	)		(18,207	)
Carrying amount as at December 31, 2017		18,815			14,407			38,900		26,838			533			99,493
Cost:
As at January 1, 2016		16,091			16,322			—		—			2,165			34,578
Additions		3,647			5,282			—		—			—			8,929
Exchange differences		(1,156	)		(85	)		—		—			—			(1,241	)
Disposals		—			—			—		—			—			—
As at December 31, 2016		18,582			21,519			—		—			2,165			42,266
Accumulated amortization and impairment:
As at January 1, 2016		(1,688	)		(8,285	)		—		—			(1,411	)		(11,384	)
Amortization		(544	)		(1,612	)		—		—			(113	)		(2,269	)
Exchange differences		—			81			—		—			—			81
Disposals		—			—			—		—			—			—
As at December 31, 2016		(2,232	)		(9,816	)		—		—			(1,524	)		(13,572	)
Carrying amount as at December 31, 2016		16,350			11,703			—		—			641			28,694
Cost:
As at January 1, 2015		12,833			13,039			—		—			2,165			28,037
Additions		2,792			3,733			—		—			—			6,525
Exchange differences		466			43			—		—			—			509
Disposals		—			(493	)		—		—			—			(493	)
As at December 31, 2015		16,091			16,322			—		—			2,165			34,578
Accumulated amortization and impairment:
As at January 1, 2015		(1,297	)		(6,447	)		—		—			(1,297	)		(9,041	)
Amortization		(391	)		(2,290	)		—		—			(114	)		(2,795	)
Exchange differences		—			(41	)		—		—			—			(41	)
Disposals		—			493			—		—			—			493
As at December 31, 2015		(1,688	)		(8,285	)		—		—			(1,411	)		(11,384	)
Carrying amount as at December 31, 2015		14,403			8,037			—		—			754			23,194

Summary Of Key Assumptions Used In Calculating Recoverable Amount

Percentages	2017			2016		2015
Discount rate (pre-tax)		8.2	%		n/a		n/a
Terminal value growth rate		1.1	%		n/a		n/a
Budgeted Adjusted EBITDA growth rate throughout the forecast		0.0	%		n/a		n/a

XML

Trade and other (non-) current assets (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Trade and Other Noncurrent Assets

	2017		2016		2015
	(€’000)
Non-current
Data-center-related prepaid expenses		2,708		3,507		2,834
Rental and other supplier deposits		3,736		3,056		2,929
Deferred setup cost		2,806		1,502		—
Deferred financing costs		—		142		422
Deferred rent related stamp duties		895		379		501
Collaterized cash		3,529		3,328		4,466
		13,674		11,914		11,152

Summary of Trade and Other Current Assets

	2017		2016		2015
	(€’000)
Current
Trade receivables – net (Note 21)		113,518		91,451		79,128
Taxes receivable		12,415		5,416		5,716
Accrued revenue		36,575		34,560		39,442
Prepaid expenses and other current assets		17,278		16,394		17,650
		179,786		147,821		141,936

XML

Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Share Capital and Share Premium

Share capital and share premium

	Ordinary shares
	2017		2016		2015
	(In thousands of shares)
On issue at 1 January		70,603		69,919		69,317
Issue/conversion of shares		812		684		602
On issue at 31 December		71,415		70,603		69,919

XML

Earnings per share (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Profit Attributable to Ordinary Shareholders

Profit attributable to ordinary shareholders

	2017		2016(i)		2015(i)
	(€’000)
Profit attributable to ordinary shareholders		39,067		38,336		46,680

Weighted average number of ordinary shares

	2017		2016(i)		2015(i)
Weighted average number of ordinary shares at 31 December		71,089		70,349		69,579
Dilution effect of share options, restricted and performance shares on issue		432		864		895
Weighted average number of ordinary shares (diluted) at 31 December		71,521		71,213		70,474

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade payables and other liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Trade Payables and Other Liabilities

	2017		2016		2015
	(€’000)
Non-current
Deferred revenue		7,557		6,282		5,272
Other non-current liabilities		7,523		5,436		6,777
		15,080		11,718		12,049
Current
Trade payables		47,489		23,076		25,045
Tax and social security		9,357		6,528		9,439
Customer deposits		20,878		20,671		21,208
Deferred revenue		73,262		63,974		60,700
Accrued expenses		78,770		57,043		46,103
Other current liabilities		122		107		134
		229,878		171,399		162,629

Summary of Accrued Expenses

Accrued expenses are analyzed as follows:

	2017		2016		2015
	(€’000)
Data-center-related costs		36,805		18,752		11,788
Personnel and related costs		13,273		12,261		11,709
Professional services		2,486		1,871		2,246
Customer implementation and related costs		4,492		3,081		3,346
Financing-related costs		17,909		17,498		13,454
Other		3,805		3580		3,560
		78,770		57,043		46,103

XML

Provision for onerous lease contracts (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Provision Calculated Based on Discounted Future Contracted Payments Net of Sublease Revenues

The provision was calculated based on the discounted future contracted payments net of any sublease revenues.

	2017		2016			2015
	(€’000)
As at 1 January		—		1,517			4,934
Increase/(decrease) in provision		—		—			(184	)
Unwinding of discount		—		16			115
Utilization of provision		—		(1,533	)		(3,348	)
As at 31 December		—		—			1,517
Non-current		—		—			—
Current		—		—			1,517
		—		—			1,517

XML

Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Current and Non-Current Borrowings

	2017		2016		2015
	(€’000)
Non-current
Senior Secured Notes 6.0%, due 2020		628,141		629,327		475,503
Mortgages		45,386		43,508		40,727
Finance lease liabilities		50,525		51,140		34,582
		724,052		723,975		550,812
Current
Mortgages		8,254		10,904		3,346
Finance lease liabilities		602		578		—
2017 Senior Secured Revolving Facility		99,904		—		—
Other loans		—		—		1,605
		108,760		11,482		4,951
Total borrowings		832,812		735,457		555,763

Summary of Optional Redemption Price Expressed as Percentage

At any time after July 15, 2016 and before maturity, upon not less than ten and not more than 60 days’ notice, the Company may redeem all or part of the Senior Secured Notes. These redemptions will be in amounts of €100,000 or integral multiples of €1,000 in excess thereof at the following redemption prices (expressed as percentages of their principal amount at maturity), plus accrued and unpaid interest, if any, to the redemption date, if redeemed during the 12-month period commencing on July 15 of the years set out below.

Year	Redemption Price
2017		103.000	%
2018		101.500	%
2019 and thereafter		100.000	%

Summary of Reconciliation of Movements of Liabilities to Cash Flows Arising from Financing Activities

The reconciliation of movements of liabilities to cash flows arising from financing activities is set out below:

	Senior Secured Notes			Mortgages			Finance lease liabilities			Revolving Facilities			Share capital		Share premium		Foreign currency translation reserve			Hedging Reserve			Accumulated profit/(deficit)		Total
	(€’000)
Balance as at 1 January 2017		629,327			54,412			51,718			—			7,060		519,604		9,988			(243	)		12,360		1,284,226
Changes from financing cash flows
Proceeds from exercised options		—			—			—			—			55		6,914		—			—			—		6,969
Proceeds from mortgages		—			9,950			—			—			—		—		—			—			—		9,950
Repayment of mortgages		—			(10,848	)		—			—			—		—		—			—			—		(10,848	)
Proceeds from Revolving Facilities		—			—			—			129,521			—		—		—			—			—		129,521
Repayment of Revolving Facilities		—			—			—			(30,000	)		—		—		—			—			—		(30,000	)
Finance lease obligation		—			—			(995	)		—			—		—		—			—			—		(995	)
Total changes from financing cash flows		—			(898	)		(995	)		99,521			55		6,914		—			—			—		104,597
Other changes
Liability-related
Amortized borrowing costs		(1,186	)		126			—			383			—		—		—			—			—		(677	)
Interest expense		—			—			404			—			—		—		—			—			—		404
Total liability-related		(1,186	)		126			404			383			—		—		—			—			—		(273	)
Total equity-related other changes		—			—			—			—			26		5,724		(7,040	)		74			42,206		40,990
Balance as at 31 December 2017		628,141			53,640			51,127			99,904			7,141		532,242		2,948			(169	)		54,566		1,429,540

Summary of Maturity Profile of the Gross Amounts of Senior Secured Notes and Mortgages

The maturity profile of the gross amounts of Senior Secured Notes, the 2013 Super Senior Revolving Facility, the 2017 Senior Secured Revolving Facility and Mortgages are set out below:

	2017		2016		2015
	(€’000)
Within one year		104,400		7,332		—
Between 1 and 5 years		648,000		643,800		503,199
Over 5 years		26,916		29,107		16,447
		779,316		680,239		519,646

The Group has the following undrawn bank borrowing facilities:

	2017		2016		2015
	(€’000)
Expiring within one year		100,000		—		—
Expiring between 1 and 5 years		—		100,000		100,000
		100,000		100,000		100,000

Summary of Financial Lease Liabilities Relate to the Acquisition of Property,Plant and Equipment

Financial lease liabilities relate to the acquisition of property, plant and equipment with the following payment schedule:

	2017		2016		2015
	(€’000)
Gross lease liabilities:
Within one year		4,389		4,346		2,990
Between 1 and 5 years		29,625		31,904		30,230
More than 5 years		36,478		39,144		20,024
		70,492		75,394		53,244
Interest
Within one year		3,693		3,898		3,374
Between 1 and 5 years		10,218		11,897		11,129
More than 5 years		5,454		7,881		4,159
		19,36519		23,676		18,662
Present value of minimum lease payments
Within one year		696		448		(384	)
Between 1 and 5 years		19,407		20,007		19,101
More than 5 years		31,024		31,263		15,865
		51,127		51,718		34,582

XML

Financial instruments (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Schedule of Credit Risk Exposure

The total balance exposed to credit risk at the reporting date was:

	2017		2016		2015
	(€’000)
Trade receivables		113,518		91,451		79,128
Accrued revenue		36,575		34,560		39,442
Rental and other supplier deposits		3,736		3,056		2,929
Other investments		3,693		1,942		—
Collaterized cash		4,053		3,729		4,868
Cash and cash equivalents		38,484		115,893		53,686
		200,059		250,631		180,053

Schedule of Credit Risk Exposure for Trade Receivables

The exposure to credit risk for trade receivables at the reporting date by geographic region was:

	2017		2016		2015
	(€’000)
UK, France, Germany and The Netherlands		88,634		71,099		62,448
Rest of Europe		23,995		19,807		16,246
Corporate		889		545		434
		113,518		91,451		79,128

Schedule of Aging of Trade Receivables

The aging of trade receivables as at the reporting date was:

	2017				2016				2015
	Gross		Allowance		Gross		Allowance		Gross		Allowance
	(€’000)
Not past due		88,530		—		69,771		—		66,016		—
Past due 0–30 days		9,448		—		12,027		—		7,569		—
Past due 31–120 days		13,111		39		7,329		8		3,589		20
Past due 121 days–1 year		2,295		223		2,358		234		1,797		111
More than 1 year		725		329		324		116		349		61
		114,109		591		91,809		358		79,320		192

Schedule of Allowance for Impairment

The movement in the allowance for impairment in respect of trade receivables during the year was as follows:

	2017			2016			2015
	(€’000)
Balance as at 1 January		358			192			273
Impairment loss recognized		316			285			144
Write-offs		(83	)		(119	)		(225	)
Balance as at 31 December		591			358			192

Schedule of Contractual Maturities of Financial Liabilities

The following are the contractual maturities of financial liabilities, including interest payments and excluding the impact of netting agreements.

December 31, 2017

	Carrying amount		Contractual cash flows		Less than 1 year		Between 1 - 5 years		More than 5 years
	(€’000)
Financial liabilities
Senior Secured Notes		628,141		737,500		37,500		700,000		—
Finance lease liabilities		51,127		70,492		4,389		29,625		36,478
Mortgages		53,640		59,684		9,380		33,149		17,155
2017 Senior Secured Revolving Facility		100,000		100,000		100,000		—		—
Trade and other payables(1)		145,412		145,412		145,225		26		161
		978,320		1,113,088		296,494		762,800		53,794

December 31, 2016

	Carrying amount		Contractual cash flows		Less than 1 year		Between 1 - 5 years		More than 5 years
	(€’000)
Financial liabilities
Senior Secured Notes		629,327		775,000		37,500		737,500		—
Finance lease liabilities		51,718		75,394		4,346		31,904		39,144
Mortgages		54,412		60,792		12,137		28,980		19,675
Trade and other payables(1)		95,803		95,803		95,624		26		153
	831,260		1,006,989		149,607		798,410		58,972

December 31, 2015

	Carrying amount		Contractual cash flows		Less than 1 year		Between 1 - 5 years		More than 5 years
	(€’000)
Financial liabilities
Senior Secured Notes		475,503		617,500		28,500		589,000		—
Finance lease liabilities		34,582		53,244		2,990		30,230		20,024
Mortgages		44,073		49,748		4,466		34,120		11,162
Other loans		1,605		1,629		1,629		—		—
Trade and other payables(1)		89,743		89,743		89,743		—		—
		645,506		811,864		127,328		653,350		31,186

Notes:—

(1) The carrying amount excludes accrued interest on Senior Secured Notes and mortgages, deferred revenues and rental holidays.

Schedule of Foreign Exchange Rates

The following significant exchange rates applied during the year:

	Average rate						Report date mid-spot rate
	2017		2016		2015		2017		2016		2015
Euro
GBP 1		1.141		1.220		1.379		1.126		1.167		1.357
CHF 1		0.897		0.918		0.937		0.855		0.931		0.923
DKK 1		0.134		0.134		0.134		0.134		0.135		0.134
SEK 1		0.104		0.106		0.107		0.102		0.104		0.109

Schedule of Sensitivity Analysis

This analysis assumes that all other variables, in particular interest rates, remained constant and was performed on the same basis for 2016 and 2015.

	Equity			Profit or loss
	(€’000)
December 31, 2017
GBP		(5,148	)		(1,712	)
CHF		(4,755	)		(148	)
DKK		(2,512	)		(246	)
SEK		(1,348	)		(196	)
December 31, 2016
GBP		(3,490	)		(127	)
CHF		(4,990	)		(186	)
DKK		(2,268	)		(211	)
SEK		(1,179	)		38
December 31, 2015
GBP		(3,848	)		(1,290	)
CHF		(4,757	)		(148	)
DKK		(2,042	)		(186	)
SEK		(356	)		(137	)

Schedule of Financial Instruments by Type of Interest Rate

At the reporting date, the interest rate profile of the Group’s interest-bearing financial instruments was:

	Carrying amount
	2017		2016		2015
	(€’000)
Fixed-rate instruments
Senior Secured Notes		628,141		629,327		475,503
Finance lease liabilities		51,127		51,718		34,582
Mortgages		4,927		5,400		5,870
Other loans		—		—		1,605
	684,195		686,445		517,560
Variable-rate instruments
Mortgages		48,713		49,012		38,203
2017 Senior Secured Revolving Facility		99,904		—		—
		148,617		49,012		38,203
		832,812		735,457		555,763

Schedule of Financial Instruments by Type of Interest Rates

This analysis assumes that all other variables, in particular foreign currency rates, remained constant.

	Profit or loss					Equity
	100 bp increase			100 bp decrease		100 bp increase			100 bp decrease
	(€’000)
December 31, 2017
Variable rate instruments		(1,021	)		1,021		(76	)		76
December 31, 2016
Variable rate instruments		(478	)		478		(84	)		84
December 31, 2015
Variable rate instruments		(261	)		261		(91	)		91

Schedule of Fair Value of Assets and Liabilities

The values of the instruments are:    

	Carrying value			Fair value
	(€’000)
				Level 1			Level 2			Level 3
December 31, 2017
Senior secured notes 6.00% due 2020		(628,141	)		(647,000	)		—			—
2017 Senior Secured Revolving Facility		(99,904	)		—			(99,904	)		—
Finance leases		(51,127	)		—			(54,282	)		—
Mortgages		(53,640	)		—			(53,640	)		—
Other investments		3,693			—			3,693			—
Interest rate swap		(255	)		—			(255	)		—
Conversion option		0			—			—			0
December 31, 2016
Senior secured notes 6.00% due 2020		(629,327	)		(657,000	)		—			—
Finance leases		(51,718	)		—			(55,625	)		—
Mortgages		(54,412	)		—			(54,412	)		—
Other investments		1,942			—			1,942			—
Interest rate swap		(367	)		—			(367	)		—
Conversion option		0			—			—			0
December 31, 2015
Senior secured notes 6.00% due 2020		(475,503	)		(502,000	)		—			—
Finance leases		(34,582	)		—			(41,012	)		—
Mortgages		(44,073	)		—			(44,073	)		—
Interest rate swap		(321	)		—			(321	)		—

Schedule of Net Debt to Equity Ratio

The Board of Directors monitors the return on capital based on a ratio calculated as Total liabilities minus Cash and cash equivalents, divided by Shareholders ‘equity:

	2017			2016			2015
	(€’000)
Total liabilities		1,105,343			933,896			744,647
Less: cash		(38,484	)		(115,893	)		(53,686	)
	1,066,859			818,003			690,961
Equity
Total equity		596,728			548,769			507,417
Ratio of Total liabilities minus Cash and cash equivalents, divided by Shareholders’equity:		1.79			1.49			1.36

XML

Share-based payments (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Outstanding Options and Restricted Shares as of December 31, 2017

The terms and conditions of the grants (excluding restricted shares and performance share grants), under the 2011 and 2013 Option Plans with an USD exercise price, were as follows:

Grant date	Employees entitled	Exercise price in $	Outstanding		Exercisable
		(in thousands)
2011	Senior employees	13.00-14.65		88		88
2012	Senior employees	20.50		1		1
2013	Senior employees	10.00-15.00		4		4
2014	Senior employees	17.50		82		77
2015	Senior employees	24.60-27.26		59		32
2016	Senior employees	27.14-34.00		74		26
2017	Senior employees	35.60-45.84		22		—
	Total share options			330		228

Schedule of Number and Weighted Average Fair Value of Restricted Shares

The number and weighted average fair value of restricted shares that were awarded as at December 31, 2017, 2016 and 2015 is broken down as follows:

	2017					2016					2015
	Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)
Outstanding 1 January		253			29.51		308			25.76		272			24.16
Granted		104			47.14		92			35.49		158			28.02
Vested		(147	)		27.84		(124	)		25.66		(118	)		25.05
Forfeited		(40	)		30.98		(23	)		23.67		(4	)		27.38
Outstanding at 31 December		170			41.39		253			29.51		308			25.76

Schedule of Number and Weighted Average Fair Value of Performance Shares

The number and weighted average fair value of performance shares that were finally awarded as at December 31, 2017, 2016 and 2015 is broken down as follows:

	2017					2016					2015
	Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)		Shares			Weighted Average Grant date value (USD)
Outstanding 1 January		253			27.92		129			23.94		—			—
Granted		62			38.80		196			30.42		163			24.33
Vested		(108	)		29.37		(72	)		27.63		(34	)		25.77
Forfeited		(3	)		21.20		—			—		—			—
Outstanding at 31 December		204			30.55		253			27.92		129			23.94

Overview of Inputs Used in Black-Scholes Valuation Model

The weighted average fair value at grant date of options granted during the period was determined using the Black-Scholes valuation model. The following inputs were used:

	2017	2016	2015
Share price in € at grant date	37.48-48.38	28.09-33.89	23.84-28.46
Exercise price in €	31.68-39.08	24.27-30.47	21.61-24.95
Dividend yield	0%	0%	0%
Expected volatility	26%	30%	30%
Risk-free interest rate	1.8%-2.1%	1.2%	0.0%-0.4%
Expected life weighted average	5.1 years	5.0 years	5.1 years

2011 and 2013 Option Plans [member]

Schedule of Number and Weighted Average Exercise Price of Share Options Outstanding

The number and weighted average exercise prices of outstanding share options under the 2011 and 2013 Option Plans, excluding the restricted shares and performance share grants, with U.S. dollar exercise prices are as follows:

	Weighted average exercise price in $						Number of options in thousands
	2017		2016		2015		2017			2016			2015
Outstanding at 1 January		16.70		14.98		14.35		865			1,264			1,641
Granted		37.91		31.20		25.17		30			94			90
Exercised		14.13		14.90		14.23		(550	)		(479	)		(423	)
Expired		—		—		—		—			—			—
Forfeited		30.67		20.49		19.29		(15	)		(14	)		(44	)
Outstanding – 31 December		22.30		16.70		14.98		330			865			1,264
Exercisable – 31 December		18.34		14.22		14.24		228			689			1,030

2008 Option Plan [member]

Schedule of Number and Weighted Average Exercise Price of Share Options Outstanding

The number and weighted average exercise prices of outstanding share options, post reverse stock-split, under the 2008 Option Plan with euro exercise prices are as follows:

	Weighted average exercise price in €						Number of options in thousands
	2017		2016		2015		2017		2016		2015
Outstanding at 1 January		—		—		7.19		—		—		14
Granted		—		—		—		—		—		—
Exercised		—		—		7.19		—		—		(14	)
Expired		—		—		—		—		—		—
Forfeited		—		—		—		—		—		—
Outstanding – 31 December		—		—		—		—		—		—
Exercisable – 31 December		—		—		—		—		—		—

XML

Business combinations (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Purchase Price Allocation for Acquisition

The table below summarizes the purchase price allocation for the acquisition of Interxion Science Park:

	€’000
Property, plant and equipment		16,821
Trade receivables(1)		1,165
Other current assets		959
Trade payables and other liabilities		(1,249	)
Provisions		(280	)
Goodwill		38,900
Customer portfolio		28,005
Deferred taxes		(6,804	)
Total purchase price		77,517

Notes:

(1) Trade and other receivables represent contractual gross amounts less €30 thousand, which was determined to be uncollectible at the date of acquisition.

XML

Financial commitments (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Future Minimum Commitments for (Non-)cancellable Operating Leases

At December 31, the Group has future minimum commitments for non-cancellable operating leases with terms in excess of one year as follows:

	2017		2016		2015
	(€’000)
Within 1 year		35,107		28,698		30,857
Between 1 and 5 years		136,143		118,115		125,243
After 5 years		189,298		171,313		181,059
		360,548		318,125		337,159

Summary of Contracts with Customers for Future Committed Revenue Receivable

At December 31 the Group had contracts with customers for future committed revenue receivable as follows:

	2017		2016		2015
	(€’000)
Within 1 year		327,500		296,600		275,400
Between 1 and 5 years		449,500		434,900		353,600
After 5 years		35,600		52,700		76,700
		812,600		784,200		705,700

Summary of Non-cancellable Energy Purchase Commitments

At December 31, the Group had entered into non-cancellable energy purchase commitments as follows:

	2017		2016		2015
	(€’000)
Within 1 year		41,500		39,100		36,400
Between 1 and 5 years		42,000		21,000		13,700
		83,500		60,100		50,100

XML

Related-party transactions (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Total Compensation of Key Management

The total compensation of key management, which was recognized in the consolidated income statement, was as follows:

	2017		2016(i)		2015(i)
	(€’000)
Short-term employee benefits (salaries and bonuses)		3,454		3,473		3,341
Post-employment benefits		62		74		43
Share-based payments		6,386		4,700		4,997
Total		9,902		8,247		8,381

⁽ⁱ⁾  Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Summary of Compensation of Executive Director and Non-executive Directors of the Board

The “Share-based payment charges” and the “Total” numbers included in the following tables are calculated in accordance with IFRS accounting standards and reflect charges for both the shares that vested in the year as well as charges for shares that are scheduled to vest in future years.:

	2017
	Salaries			Bonus			Share- based payment charges		Total
	(€’000)
D.C. Ruberg		590	1		668	2		4,198		5,456
F. Esser		65			—			40		105
M. Heraghty		70			—			40		110
J.F.H.P. Mandeville		90			—			40		130
R. Ruijter		75			—			40		115
Total		890			668			4,358		5,916

	2016									2015
	Salaries			Bonus		Share- based payment charges(i)		Total		Salaries			Bonus		Share- based payment charges(i)		Total
	(€’000)									(€’000)
D.C. Ruberg		590	1		597		2,044		3,231		590	1		693		2,120		3,403
J.C. Baker											21			—		—		21
F. Esser		65			—		40		105		65			—		27		92
M. Heraghty		70			—		40		110		68			—		27		95
J.F.H.P. Mandeville		115	3		—		40		155		40			—		27		67
R.M. Manning											17			—		—		17
R. Ruijter		75			—		40		115		73			—		65		138
Total		915			597		2,204		3,716		874			693		2,266		3,833

1 Includes allowance of €40,000.

2 Based on performance achievements during 2017, this amount is calculated as 121.4% of base salary.

3 Includes €25,000 that has additionally been awarded in relation to the period of July 1, 2015 – December 31, 2015.

(i) Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

Disclosure of Performance Achievement Measures to Determine Pay-Out of Cash Bonus

The performance achievement on each of these measures, together with their weighting, determine the pay-out of the cash bonus in accordance with the table below.

Pay-out as % of Target Cash Bonus

	Pay-out at Threshold Performance			Pay-out at Target Performance			Pay-out at Maximum Performance
Revenue		0	%		40	%		60	%
Adjusted EBITDA Margin		0	%		40	%		60	%
Individual Performance Objectives		0	%		20	%		25	%
Pay-out as % of at target cash bonus		0	%		100	%		145	%

Summary of Performance/Pay-Out

Performance is measured based on a percentile ranking basis, with pay-outs in accordance with the performance/pay-out table below:

TSR Performance Categories (S&P SmallCap 600 Constituents)	Adjustment to the number of Performance Shares Conditionally Awarded
75th Percentile or greater	x 1.75
50th Percentile	x 1.00
25th Percentile	x 0.25
Less than 25th Percentile	x 0.00

Summary of Potential Compensation Pay-Outs

The tables below summarise our Executive Director’s at target and maximum total direct compensation in 2015, 2016 and 2017 (amounts in €’000).

	2015 & 2016 Annual at target amounts			2017 Annual at target amounts
Base Salary		550			550
Car Allowance		40			40
STI: Cash Bonus		550	(100% of Base Salary)		605	(110% of Base Salary)
LTI: Performance Shares		1,650	(300% of Base Salary)*		1,650	(300% of Base Salary)
Total direct compensation		2,790			2,845

	2015 & 2016 Annual maximum amounts			2017 Annual maximum amounts
Base Salary		550			550
Car Allowance		40			40
STI: Cash Bonus		798	(145% of at target bonus)		877	(145% of at target bonus)
LTI: Performance Shares		2,887	(175% of at target award in # shares)*		2,887	(175% of at target award in # shares)
Total direct compensation		4,275			4,354

* For the years 2015 and 2016, the tables provide the at target and maximum values at award date of the conditional performance share awards made in these years. Of the 68,639 performance shares that were conditionally awarded in 2015, 38,286 shares from this award have vested following the initial adjustment in 2016 of the number of performance shares (in accordance with the terms and conditions of the previous long-term incentive plan), and shareholder approval at the 2016 Annual General Meeting. The unvested portion of 34,320 shares (50%) of the 2015 conditional performance share award is subject to the terms and conditions of the 2017 Plan. The 61,469 performance shares conditionally awarded in 2016 are all subject to the terms and conditions of the 2017 Plan.

Summary of Performance Targets and Achievement Against Targets

Actual Short-Term Incentive Pay-Outs: 2015 Achievement Against Target

In 2015, the Target Cash Bonus for our Executive Director was €550,000, or 100% of base salary, with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The table below sets out the performance targets set for 2015 and the achievement against them.

	Target Weighting			Target Performance			Actual Performance			Pay-out (% of at target cash bonus)
Revenue (in million €)		40	%		381.6			386.6			60	%
Revenue Growth					12.0	%		13.5	%
Adjusted EBITDA Margin		40	%		44.0	%		44.3	%		46	%
Individual Performance Objectives		20	%					Met			20	%
Overall Performance Achievement %		100	%								126.0	%

Actual Short-Term Incentive Pay-outs: 2016 Achievement Against target

In 2016, the Target Cash Bonus for our Executive Director was €550,000, or 100% of base salary, with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The table below sets out the performance targets set for 2016 and the achievement against them.

	Target Weighting			Target Performance			Actual Performance			Pay-out (% of at target cash bonus)
Revenue (in million €)		40	%		424.0			421.8			28.6	%
Revenue Growth					9.7	%		9.1	%
Adjusted EBITDA Margin		40	%		44.9	%		45.3	%		60	%
Individual Performance Objectives		20	%					Met			20	%
Overall Performance Achievement %		100	%								108.6	%

Actual Short-Term Incentive Pay-outs: 2017 Achievement Against target

In 2017, the Target Cash Bonus for our Executive Director was €605,000, or 110% of base salary, with a maximum pay-out opportunity of 145% of the Target Cash Bonus. The table below sets out the performance targets set for 2017 and the achievement against them.

	Target Weighting			Target Performance			Actual Performance			Pay-out (% of at target cash bonus)
Revenue (in million €)		40	%		473.5			493.5			60.0	%
Revenue Growth					12.3	%		17.0	%
Adjusted EBITDA Margin		40	%		45.5	%		45.0	%		27.3	%
Individual Performance Objectives		20	%					115.0	%		23.0	%
Overall Performance Achievement %											110.3	%

Summary of Number of Performance Shares Conditionally Awarded

The following table provides the number of performance shares conditionally awarded in 2015, 2016 and 2017 and the number of shares that would would potentially be awarded (subject to Board and Shareholder approval at the relevant Annual General Meeting) based on three-year relative TSR performance at the 25^th, 50^th, and 75^th percentile performance of the constituents of the S&P SmallCap 600.

	# Performance shares conditionally awarded*			# Performance shares to be awarded based on relative TSR performance
Conditional award year				At 25th percentile		At 50% percentile		At 75th percentile
2015		34,320	**		8,580		34,320		60,060
2016***		61,469			15,367		61,469		107,571
2017***		46,808			11,702		46,808		81,914

* Calculated based on the Company’s January average closing share price of $27.95 (2015), $29.16 (2016) and $37.42 (2017).

** The unvested portion (50%) of the 2015 conditional performance share award of 68,639 performance shares. 38,286 shares from the 2015 award have already vested following the initial adjustment in 2016 of the number of performance shares (in accordance with the terms and conditions of the previous long-term incentive plan), and shareholder approval of the adjusted award at the Annual General Meeting in June 2016.

*** The final award determination of the performance shares conditionally awarded in 2016, will be determined early 2019, in accordance with the rules of the 2017 Plan. The final award determination of the performance shares conditionally awarded in 2017 will be determined early 2020. The final performance share awards for the award years 2016 and 2017 will be subject to Board approval and then shareholder approval at the Annual General Meetings in 2019 and 2020, respectively. Should the final relevant awards be approved, the shares will vest in two equal instalments. The first instalment (50% of the initial performance share award) will vest upon approval of the relevant Annual General Meeting, the second instalment (50% of the final performance share award) will vest on January 1^st of the following year.

Summary of TSR Performance

The following table provides the Company’s three-year TSR performance and the three-year TSR performance of the constituents of the S&P SmallCap over the period January 1, 2015 through December 31, 2017.

	Cumulative TSR*
S&P SmallCap 600
75th Percentile		74	%
50th Percentile		32	%
25th Percentile		-9	%
INXN		105	%

* Starting price is the average closing share price in the month of January 2015, ending price is the average closing share price in the month of December 2017. Includes share price appreciation/depreciation, re-investment of dividends and the compounding effect of dividends paid on re-invested dividends, all over the relevant performance period.

XML

Correction of errors (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Consolidated Statement of Financial Position

January 1, 2015	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
Total assets		1,173,103			—			1,173,103
Total liabilities		736,958			—			736,958
Share premium		495,109			634			495,743
Accumulated profit/(deficit)		(76,089	)		(634	)		(76,723	)
Others		17,125			—			17,125
Total Shareholder’s equity		436,145			—			436,145

December 31, 2015	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
Total assets		1,252,064			—			1,252,064
Total liabilities		744,647			—			744,647
Share premium		507,296			2,520			509,816
Accumulated profit/(deficit)		(27,523	)		(2,520	)		(30,043	)
Others		27,644			—			27,644
Total Shareholder’s equity		507,417			—			507,417

December 31, 2016	Impact of correction of error
	(€’000)
	As previously reported		Adjustments			As corrected
Total assets		1,482,665		—			1,173,103
Total liabilities		933,896		—			736,958
Share premium		519,604		4,067			523,671
Accumulated profit/(deficit)		12,360		(4,067	)		(8,293	)
Others		16,805		—			17,125
Total Shareholder’s equity		548,769		—			436,145

Summary of Consolidated Income Statement and Consolidated Statement of Comprehensive Income

For the year ended December 31, 2015	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
General and administrative costs		(132,505	)		(1,886	)		(134,391	)
Others		181,071			—			181,071
Net income		48,566			(1,886	)		46,680
Other comprehensive income/(loss, net of tax		10,459			—			10,459
Total comprehensive income attributable to shareholders		59,025			(1,886	)		57,139
Earnings per share attributable to shareholders
Basic earnings per share: (€)		0.70			(0.03	)		0.67
Diluted earnings per share: (€)		0.69			(0.03	)		0.66

For the year ended December 31, 2016	Impact of correction of error
	(€’000)
	As previously reported			Adjustments			As corrected
General and administrative costs		(137,010	)		(1,547	)		(138,557	)
Others		181,071			—			181,071
Net income		39,883			(1,547	)		38,336
Other comprehensive income/(loss), net of tax		(10,907	)		—			(10,907	)
Total comprehensive income attributable to shareholders		28,976			(1,547	)		27,429
Earnings per share attributable to shareholders
Basic earnings per share: (€)		0.57			(0.03	)		0.54
Diluted earnings per share: (€)		0.56			(0.02	)		0.54

Summary of Key Management Compensation

Key management compensation (Note 27)

For the year ended December 31, 2015	Impact of correction of error
	(€’000)
	As previously reported		Adjustments		As corrected
Short-term employee benefits (salaries and bonuses)		3,341		—		3,341
Post-employment benefits		43		—		43
Share-based payments		3,381		1,886		5,267
		6,765		1,886		8,651

For the year ended December 31, 2016	Impact of correction of error
	(€’000)
	As previously reported		Adjustments		As corrected
Short-term employee benefits (salaries and bonuses)		3,473		—		3,473
Post-employment benefits		74		—		74
Share-based payments		3,427		1,547		4,974
		6,974		1,547		8,521

XML

Significant Accounting Policies - Disclosure of Detailed Information about Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2017
Data center freehold land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	Not depreciated
Bottom of range [member] | Data center buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	15 years
Bottom of range [member] | Data center infrastructure and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	5 years
Bottom of range [member] | Office equipment and other [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	3 years
Top of range [member] | Data center buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	30 years
Top of range [member] | Data center infrastructure and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	20 years
Top of range [member] | Office equipment and other [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property plant and equipment estimated useful lives	15 years

XML

Significant Accounting Policies - Disclosure of Detailed Information about Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2017
Customer portfolio [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	20 years
Bottom of range [member] | Power grid rights [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	10 years
Bottom of range [member] | Software [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	3 years
Bottom of range [member] | Other [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	3 years
Top of range [member] | Power grid rights [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	15 years
Top of range [member] | Software [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	5 years
Top of range [member] | Other [member]
Disclosure of detailed information about intangible assets [line items]
Intangible assets estimated useful life	12 years

XML

Significant accounting policies - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Apr. 14, 2016	Dec. 31, 2015	Jul. 03, 2013
Disclosure of significant accounting policies [line items]
Property lease additional terms	5 years
Big4 capital expenditure as percentage of consolidated capital expenditure	64.00%
Borrowings interest rate	6.00%	6.00%		6.00%
Current lease commitments	€ 361
Senior secured notes 6.00% due 2020 [member]
Disclosure of significant accounting policies [line items]
Borrowings interest rate	6.00%		6.00%		6.00%
Bottom of range [member]
Disclosure of significant accounting policies [line items]
Target secured term of property lease contracts	20 years
Target initial lease term	10 years
Bottom of range [member] | Capitalised development expenditure [member]
Disclosure of significant accounting policies [line items]
Big4 capital expenditure as percentage of consolidated capital expenditure	68.00%
Top of range [member]
Disclosure of significant accounting policies [line items]
Target secured term of property lease contracts	25 years
Target initial lease term	15 years
Top of range [member] | Capitalised development expenditure [member]
Disclosure of significant accounting policies [line items]
Big4 capital expenditure as percentage of consolidated capital expenditure	70.00%

XML

Significant Accounting Policies - Disclosure of Expected Impact of Initial Application of New Standards or Interpretations (Detail)	12 Months Ended
	Dec. 31, 2017
Amendments to IFRS 10 and IAS 28:Sale or contribution of assets between an investor and its associate or joint venture [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
New standard or amendments	Amendments to IFRS 10 and IAS 28: Sale or contribution of assets between an investor and its associate or joint venture
Effective date description	Deferred indefinitely
IFRS 15 - Revenue from contracts with customers [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
New standard or amendments	IFRS 15 - Revenue from Contracts with Customers;
Effective date	Jan. 01, 2018
IFRS 9 - Financial instruments [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
New standard or amendments	IFRS 9 - Financial Instruments;
Effective date	Jan. 01, 2018
Amendments to IFRS 2: Classification and measurement of share-based payment transactions [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
New standard or amendments	Amendments to IFRS 2: Classification and measurement of share-based payment transactions;
Effective date	Jan. 01, 2018
IFRS 16 leases [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
New standard or amendments	IFRS 16 - Leases
Effective date	Jan. 01, 2019

XML

Financial risk management - Credit risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial risk management [abstract]
Concentrations of risk description	The Group's most significant customer, which is serviced from multiple locations and under a number of service contracts, accounted for 14% of revenues in 2017, for 13% of revenues in 2016, and for 11% in 2015.
Total revenue share of the Group's most significant customer	14.00%	13.00%	11.00%

XML

Financial risk management - Trade and other receivables - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Trade receivables [member]
Disclosure of financial risk management [line items]
Recurring revenue as percentage of Total revenue	95.00%	95.00%	94.00%

XML

Financial risk management - Loans given - Additional Information (Detail) - Convertible loan [member] - Icolo Ltd. [member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Disclosure of financial risk management [line items]
Loan amount	$ 4.5
Loans disbursed	$ 4.0

XML

Financial risk management - Senior Secured Notes - Additional Information (Detail)				1 Months Ended	12 Months Ended
	Apr. 14, 2016 EUR (€) Note	Apr. 29, 2014 EUR (€) Note	Jul. 03, 2013 EUR (€)	Apr. 14, 2016 EUR (€) Note	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)		Dec. 31, 2015 EUR (€)
Disclosure of financial risk management [line items]
Senior Secured Note					€ 832,812,000	€ 735,457,000		€ 555,763,000
Borrowings interest rate					6.00%	6.00%		6.00%
Senior secured notes - net proceeds		€ 157,900,000				€ 154,808,000	[1]
Offering fees and expenses		2,300,000
Senior secured notes 6.00% due 2020 [member]
Disclosure of financial risk management [line items]
Senior Secured Note	€ 475,000,000	325,000,000	€ 325,000,000	€ 475,000,000	€ 325,000,000
Borrowings interest rate	6.00%		6.00%	6.00%	6.00%
Senior secured notes - net proceeds				€ 155,300,000
Offering fees and expenses				2,100,000
Senior secured notes 6.00% due 2020 [member] | Top of range [member]
Disclosure of financial risk management [line items]
Consolidated fixed charge ratio			2.00%
Consolidated senior leverage ratio			4.00%
Senior Secured Notes due 2017 [member]
Disclosure of financial risk management [line items]
Senior Secured Note			€ 260,000,000
Description of restrictive covenants					The restrictive covenants are subject to customary exceptions and are governed by a consolidated fixed charge ratio (Adjusted EBITDA to Finance Charges) to exceed 2.00 and a consolidated senior leverage ratio (Total Net Debt to Pro-forma EBITDA) not to exceed 4.00. In addition, the aggregate of any outstanding debt senior to our Senior Secured Notes should not exceed €100.0 million.
Senior Secured Notes due 2017 [member] | Top of range [member]
Disclosure of financial risk management [line items]
Maximum aggregate outstanding debt senior			€ 100,000,000
6% Senior Secured Notes due 2020 Additional Note [member]
Disclosure of financial risk management [line items]
Senior Secured Note	€ 150,000,000	€ 150,000,000		€ 150,000,000
Borrowings interest rate		6.00%
Senior secured notes - net proceeds	155,300,000	€ 157,900,000
Offering fees and expenses	€ 2,100,000	€ 2,300,000
Premium | Note	104.50	106.75		104.50

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Financial risk management - Revolving Facility Agreements - Additional Information (Detail) - EUR (€) € in Thousands			1 Months Ended	12 Months Ended
	Feb. 20, 2018	Jul. 03, 2013	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial risk management [line items]
Borrowings				€ 832,812	€ 735,457	€ 555,763
Top of range [member] | Revolving facility agreement [member]
Disclosure of financial risk management [line items]
Net assets guarantor coverage percentage	85.00%
Bottom of range [member] | Revolving facility agreement [member]
Disclosure of financial risk management [line items]
Net assets guarantor coverage percentage	80.00%
Revolving facility agreement [member]
Disclosure of financial risk management [line items]
Consolidated fixed charge ratio				4.92%
Consolidated senior leverage ratio				3.60%
Revolving facility agreement [member] | Floor rate [member]
Disclosure of financial risk management [line items]
Consolidated fixed charge ratio				2.00%
Revolving facility agreement [member] | Top of range [member]
Disclosure of financial risk management [line items]
Consolidated senior leverage ratio				4.00%
Financial covenant leverage ratio			4.75%	4.75%
Revolving facility agreement [member] | Bottom of range [member]
Disclosure of financial risk management [line items]
Financial covenant leverage ratio			4.00%
2013 Super Senior Revolving Facility Agreement [member]
Disclosure of financial risk management [line items]
Borrowings		€ 325,000
Extended maturity of revolving facility		December 31, 2018

XML

Financial risk management - Senior Secured Revolving Facility - Additional Information (Detail) - EUR (€) € in Millions	Jul. 28, 2017	Mar. 09, 2017
Disclosure of financial risk management [line items]
Initial Maturity		12 months
Extension in maturity date		Six-month
Revolving credit facility interest rate		EURIBOR (subject to a zero percent floor) plus a margin of 2.25% per annum
Senior secured revolving facility	€ 100.0
Senior secured revolving facility, extended maturity date	Dec. 31, 2018
Top of range [member]
Disclosure of financial risk management [line items]
Revolving credit facility interest rate		EURIBOR plus a margin of 3.25% per annum

XML

Financial risk management - Mortgages - Additional Information (Detail)						12 Months Ended
	Apr. 08, 2016 EUR (€) Installments	Oct. 13, 2015 EUR (€) Installments	Apr. 01, 2014 EUR (€) Installments	Jun. 26, 2013 EUR (€)	Jan. 18, 2013 EUR (€)	Dec. 31, 2017 EUR (€)	Dec. 01, 2017 EUR (€)	Dec. 31, 2016 EUR (€)	Dec. 31, 2015 EUR (€)
Disclosure of financial risk management [line items]
Borrowings						€ 832,812,000		€ 735,457,000	€ 555,763,000
Mortgages [member] | Interxion Real Estate IX N.V. [member] | Mortgage Guarantor Interxion Real Estate Holding B V [member] | Interxion Real Estate Holding B.V. [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR			2.00%
Final repayment			€ 153,330
Borrowings			€ 9,200,000
Mortgages, maturity			15 years
Number of quarterly instalments | Installments			59
Annual installment			€ 153,330
Mortgages [member] | Interxion Real Estate I B.V. [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR		2.25%
Final repayment		€ 11,000,000
Borrowings		€ 15,000,000
Mortgages, maturity		5 years
Annual installment		€ 1,000,000
Annual installments | Installments		4
Mortgages [member] | Interxion Real Estate I I S A R L And Interxion Real Estate I I I Sarl [member]
Disclosure of financial risk management [line items]
Mortgage financing					€ 10,000,000		€ 10,000,000
Quarterly installment					€ 167,000
Mortgages, maturity					15 years
Percentage of interest rate swap					75.00%	0.00%
Period of interest rate					10 years
Mortgages [member] | Interxion Real Estate I I S A R L And Interxion Real Estate I I I Sarl [member] | Bottom of range [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR					2.40%
Mortgages [member] | Interxion Real Estate I I S A R L And Interxion Real Estate I I I Sarl [member] | Top of range [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR					2.80%
Mortgages [member] | Interxion Real Estate V.B.V. [member]
Disclosure of financial risk management [line items]
Mortgage financing				€ 6,000,000
Interest margin in addition to EURIBOR				2.75%
Annual installment				€ 400,000
Final repayment				€ 4,400,000
Mortgages [member] | Interxion Real Estate VIIGmbH [member] | Mortgage Guarantor Interxion Real Estate Holding B V [member] | Interxion Real Estate Holding B.V. [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR	1.95%
Final repayment	€ 91,750
Borrowings	€ 14,600,000
Mortgages, maturity	14 years 9 months
Number of monthly instalments | Installments	177
Principal amount due to be repaid	€ 76,000
Principal amount due to be repaid, increased amount	91,750
Monthly installment	€ 76,000
Mortgages [member] | Interxion Real Estate IV B.V. [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR						2.25%
Annual installment						€ 667,000
Final repayment						€ 7,332,000

XML

Financial risk management - Interest rate risk - Additional Information (Detail)						12 Months Ended
	Apr. 08, 2016 EUR (€) Installments	Oct. 13, 2015 EUR (€)	Apr. 01, 2014 EUR (€)	Jun. 26, 2013 EUR (€)	Jan. 18, 2013 EUR (€)	Dec. 31, 2017 EUR (€)
CIBOR [member] | DKK [Member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR						3.50%
STIBOR [member] | DKK [Member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR						3.50%
Interxion Real Estate V.B.V. [member] | Mortgages [member]
Disclosure of financial risk management [line items]
Mortgage financing				€ 6,000,000
Interest margin in addition to EURIBOR				2.75%
Final repayment				€ 4,400,000
Interxion Real Estate I B.V. [member] | Mortgages [member]
Disclosure of financial risk management [line items]
Mortgages, maturity		5 years
Interest margin in addition to EURIBOR		2.25%
Final repayment		€ 11,000,000
Interxion Real Estate IV B.V. [member] | Mortgages [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR						2.25%
Final repayment						€ 7,332,000
Interest rate risk [member] | Senior secured facility agreement [member] | Euro [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR						2.25%
Interest rate risk [member] | Senior secured facility agreement [member] | Euro [member] | Top of range [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR						3.25%
Interest rate risk [member] | Interxion Real Estate V.B.V. [member]
Disclosure of financial risk management [line items]
Mortgage financing				€ 6,000,000
Interest margin in addition to EURIBOR				2.75%
Interest rate risk [member] | Interxion Real Estate IX N.V. [member]
Disclosure of financial risk management [line items]
Mortgage financing			€ 9,200,000
Interest margin in addition to EURIBOR			2.00%
Interest rate risk [member] | Interxion Real Estate I B.V. [member]
Disclosure of financial risk management [line items]
Mortgage financing		€ 15,000,000
Interest margin in addition to EURIBOR		2.25%
Interest rate risk [member] | Interxion Real Estate II Sarl [member]
Disclosure of financial risk management [line items]
Mortgage financing					€ 10,000,000
Mortgages, maturity					15 years
Percentage of interest rate swap					75.00%
Interest rate risk [member] | Interxion Real Estate II Sarl [member] | Bottom of range [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR					2.40%
Interest rate risk [member] | Interxion Real Estate II Sarl [member] | Top of range [member]
Disclosure of financial risk management [line items]
Interest margin in addition to EURIBOR					2.80%
Interest rate risk [member] | Interxion Real Estate IV B.V. [member] | Mortgages [member]
Disclosure of financial risk management [line items]
Mortgage financing						€ 10,000,000
Mortgages, maturity						5 years
Interest margin in addition to EURIBOR						2.25%
Interest rate risk [member] | Interxion Real Estate VIIGmbH [member]
Disclosure of financial risk management [line items]
Mortgage financing	€ 14,600,000
Interest rate risk [member] | Interxion Real Estate VIIGmbH [member] | Interxion Real Estate Holding B.V. [member]
Disclosure of financial risk management [line items]
Mortgages, maturity	14 years 9 months
Interest margin in addition to EURIBOR	1.95%
Number of monthly instalments | Installments	177
Monthly installment	€ 76,000
Final repayment	91,750
Interest rate risk [member] | Interxion Real Estate VIIGmbH [member] | Bottom of range [member] | Interxion Real Estate Holding B.V. [member]
Disclosure of financial risk management [line items]
Principal amount due to final repayment	91,750
Interest rate risk [member] | Interxion Real Estate VIIGmbH [member] | Top of range [member] | Interxion Real Estate Holding B.V. [member]
Disclosure of financial risk management [line items]
Principal amount due to be repaid	€ 76,000

XML

Information by Segment - Entity-wide disclosures (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of geographical areas [line items]
Revenues	€ 489,302	€ 421,788	[1]	€ 386,560	[1]
Non-current assets excluding deferred tax assets and financial instruments	1,448,420	1,190,256		1,026,023
France [member]
Disclosure of geographical areas [line items]
Revenues	86,180	68,816		62,007
Non-current assets excluding deferred tax assets and financial instruments	261,558	223,917		189,926
Germany [member]
Disclosure of geographical areas [line items]
Revenues	106,069	84,449		68,568
Non-current assets excluding deferred tax assets and financial instruments	374,893	281,935		231,309
Netherlands [member]
Disclosure of geographical areas [line items]
Revenues	80,411	70,678		65,225
Non-current assets excluding deferred tax assets and financial instruments	373,390	286,604		235,270
United Kingdom [member]
Disclosure of geographical areas [line items]
Revenues	45,977	45,831		51,114
Non-current assets excluding deferred tax assets and financial instruments	87,955	81,156		96,747
Other countries [member]
Disclosure of geographical areas [line items]
Revenues	170,665	152,014		139,646
Non-current assets excluding deferred tax assets and financial instruments	€ 350,624	€ 316,644		€ 272,771

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Information by Segment - Disclosure of Information by Segment (Detail) - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Disclosure of operating segments [line items]
Revenue		€ 489,302		€ 421,788	[1]	€ 386,560	[1]
Cost of sales		(190,471)		(162,568)	[1]	(151,613)	[1]
Gross profit/(loss)		298,831		259,220	[1]	234,947	[1]
Other income		97		333	[1]	21,288	[1]
Sales and marketing costs		(33,465)		(29,941)	[1]	(28,217)	[1]
General and administrative costs		(167,190)		(138,557)	[1]	(134,391)	[1]
Operating income		98,273		91,055	[1]	93,627	[1]
Net Finance expense		(44,367)		(36,269)		(29,022)
Profit before taxation		53,906		54,786	[1]	64,605	[1]
Total assets		1,702,071		1,482,665	[1]	1,252,064	[1]	€ 1,173,103
Total liabilities		1,105,343		933,896	[1]	744,647	[1]	€ 736,958
Capital expenditures, including intangible assets	[2]	(256,015)	[3]	(250,878)		(192,636)
Depreciation, amortization and impairments		108,252		89,835	[1]	78,229	[1]
Adjusted EBITDA	[4]	220,961		190,876	[1]	171,276	[1]
Recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		462,516		399,958		365,175
Non-recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		26,786		21,830		21,385
FR, DE, NL and UK [member]
Disclosure of operating segments [line items]
Operating income		101,120		87,558		83,215
Depreciation, amortization and impairments		72,721		60,128		50,317
Adjusted EBITDA	[4]	174,818		148,191		134,328
Rest of Europe [member]
Disclosure of operating segments [line items]
Operating income		69,919		62,404		54,374
Depreciation, amortization and impairments		29,365		25,371		23,688
Adjusted EBITDA	[4]	99,665		88,195		78,868
Corporate and other [member]
Disclosure of operating segments [line items]
Cost of sales		(12,730)		(9,878)	[1]	(8,862)	[1]
Gross profit/(loss)		(12,730)		(9,878)	[1]	(8,862)	[1]
Other income	[1]					20,923
Sales and marketing costs		(17,794)		(16,342)	[1]	(15,147)	[1]
General and administrative costs		(42,242)		(32,687)	[1]	(40,876)	[1]
Operating income		(72,766)		(58,907)	[1]	(43,962)	[1]
Total assets		78,467		128,815	[1]	64,278	[1]
Total liabilities		760,087		657,953	[1]	493,255	[1]
Capital expenditures, including intangible assets	[2]	(11,365)	[3]	(10,521)	[1]	(5,820)	[1]
Depreciation, amortization and impairments		6,166		4,336	[1]	4,224	[1]
Adjusted EBITDA	[4]	(53,522)		(45,510)	[1]	(41,920)	[1]
Operating segments [member]
Disclosure of operating segments [line items]
Revenue		489,302		421,788		386,560
Cost of sales		(177,741)		(152,690)		(142,751)
Gross profit/(loss)		311,561		269,098		243,809
Other income		97		333		365
Sales and marketing costs		(15,671)		(13,599)		(13,070)
General and administrative costs		(124,948)		(105,870)		(93,515)
Operating income		171,039		149,962		137,589
Total assets		1,623,604		1,353,850		1,187,786
Total liabilities		345,256		275,943		251,392
Capital expenditures, including intangible assets	[2]	(244,650)	[3]	(240,357)		(186,816)
Depreciation, amortization and impairments		102,086		85,499		74,005
Adjusted EBITDA	[4]	274,483		236,386		213,196
Operating segments [member] | Recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		462,516		399,958		365,175
Operating segments [member] | Non-recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		26,786		21,830		21,385
Operating segments [member] | FR, DE, NL and UK [member]
Disclosure of operating segments [line items]
Revenue		318,637		269,774		246,914
Cost of sales		(119,931)		(100,921)		(93,311)
Gross profit/(loss)		198,706		168,853		153,603
Other income		97		333		365
Sales and marketing costs		(9,780)		(8,390)		(7,925)
General and administrative costs		(87,903)		(73,238)		(62,828)
Operating income		101,120		87,558		83,215
Total assets		1,229,960		990,406		878,568
Total liabilities		267,751		202,330		196,996
Capital expenditures, including intangible assets	[2]	(174,818)	[3]	(170,707)		(131,812)
Depreciation, amortization and impairments		72,721		60,128		50,317
Adjusted EBITDA	[4]	174,818		148,191		134,328
Operating segments [member] | FR, DE, NL and UK [member] | Recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		302,346		256,004		232,624
Operating segments [member] | FR, DE, NL and UK [member] | Non-recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		16,291		13,770		14,290
Operating segments [member] | Rest of Europe [member]
Disclosure of operating segments [line items]
Revenue		170,665		152,014		139,646
Cost of sales		(57,810)		(51,769)		(49,440)
Gross profit/(loss)		112,855		100,245		90,206
Sales and marketing costs		(5,891)		(5,209)		(5,145)
General and administrative costs		(37,045)		(32,632)		(30,687)
Operating income		69,919		62,404		54,374
Total assets		393,644		363,444		309,218
Total liabilities		77,505		73,613		54,396
Capital expenditures, including intangible assets	[2]	(69,832)	[3]	(69,650)		(55,004)
Depreciation, amortization and impairments		29,365		25,371		23,688
Adjusted EBITDA	[4]	99,665		88,195		78,868
Operating segments [member] | Rest of Europe [member] | Recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		160,170		143,954		132,551
Operating segments [member] | Rest of Europe [member] | Non-recurring revenue [member]
Disclosure of operating segments [line items]
Revenue		€ 10,495		€ 8,060		€ 7,095

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] Capital expenditure, including intangible assets, represent payments to acquire property, plant and equipment and intangible assets, as recorded in the consolidated statement of cash flows as "Purchase of property, plant and equipment" and "Purchase of intangible assets" respectively.

[3] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[4] "Adjusted EBITDA" is a non-IFRS financial measure within the meaning of the rules of the SEC. See "Non-IFRS Financial Measures" for more information on this measure, including why we believe that this supplemental measure is useful, and the limitations on the use of this supplemental measure.

XML

Information by Segment - Summary of Detailed Information about Reconciliation to Adjusted EBITDA (Detail) - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of detailed information about reconciliation to adjusted EBITDA [line items]
Net income		€ 39,067	€ 38,336	[1]	€ 46,680	[1]
Income tax expense		14,839	16,450	[1]	17,925	[1]
Profit before taxation		53,906	54,786	[1]	64,605	[1]
Finance income		(1,411)	(1,206)	[1]	(3,294)	[1]
Finance expense		45,778	37,475	[1]	32,316	[1]
Operating income		98,273	91,055	[1]	93,627	[1]
Depreciation, amortization and impairments		108,252	89,835	[1]	78,229	[1]
Share-based payments		9,929	7,890	[1]	9,047	[1]
Increase/(decrease) in provision for onerous lease contracts	[1],[2]				(184)
M&A transaction break fee income	[1],[3]				(20,923)
M&A transaction costs	[4]	4,604	2,429	[1]	11,845	[1]
Income from sub-leases on unused data center sites	[5]	(97)	(95)	[1]	(365)	[1]
Increase/(decrease) in provision for site restoration	[1],[6]		(238)
Adjusted EBITDA	[7]	220,961	190,876	[1]	171,276	[1]
FR, DE, NL and UK [member]
Disclosure of detailed information about reconciliation to adjusted EBITDA [line items]
Operating income		101,120	87,558		83,215
Depreciation, amortization and impairments		72,721	60,128		50,317
Share-based payments		1,074	838		1,345
Increase/(decrease) in provision for onerous lease contracts	[2]				(184)
Income from sub-leases on unused data center sites	[5]	(97)	(95)		(365)
Increase/(decrease) in provision for site restoration	[6]		(238)
Adjusted EBITDA	[7]	174,818	148,191		134,328
Rest of Europe [member]
Disclosure of detailed information about reconciliation to adjusted EBITDA [line items]
Operating income		69,919	62,404		54,374
Depreciation, amortization and impairments		29,365	25,371		23,688
Share-based payments		381	420		806
Adjusted EBITDA	[7]	99,665	88,195		78,868
Corporate and other [member]
Disclosure of detailed information about reconciliation to adjusted EBITDA [line items]
Operating income		(72,766)	(58,907)	[1]	(43,962)	[1]
Depreciation, amortization and impairments		6,166	4,336	[1]	4,224	[1]
Share-based payments		8,474	6,632	[1]	6,896	[1]
M&A transaction break fee income	[1],[3]				(20,923)
M&A transaction costs	[4]	4,604	2,429	[1]	11,845	[1]
Adjusted EBITDA	[7]	€ (53,522)	€ (45,510)	[1]	€ (41,920)	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] "Increase/(decrease) in provision for onerous lease contracts" relates to those contracts in which we expect losses to be incurred in respect of unused data center sites over the term of the lease contract. This item is treated as "General and administrative costs".

[3] "M&A transaction break fee income" represents the cash break up fee received following the termination of the Implementation Agreement in May 2015. This fee was included in "Other income".

[4] "M&A transaction costs" are costs associated with the evaluation, diligence and conclusion or termination of merger or acquisition activity. These costs are included in "General and administrative costs".

[5] "Income from sub-leases of unused data center sites" represents the income on sub-lease of portions of unused data center sites to third parties. This income is treated as "Other income".

[6] "Increase/(decrease) in provision for site restoration" represents income or expense related to the termination of data center sites. This item is treated as "Other income".

[7] "Adjusted EBITDA" is a non-IFRS financial measure within the meaning of the rules of the SEC. See "Non-IFRS Financial Measures" for more information on this measure, including why we believe that this supplemental measure is useful, and the limitations on the use of this supplemental measure.

XML

General and Administrative Costs - Summary of General and Administrative Costs (Details) (Detail) - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of general and administrative expense [line items]
Depreciation, amortization and impairments		€ 108,252	€ 89,835	[1]	€ 78,229	[1]
Share-based payments		9,929	7,890	[1]	9,047	[1]
(Increase)/decrease in provision for onerous lease contracts	[1],[2]				(184)
M&A transaction costs	[3]	4,604	2,429	[1]	11,845	[1]
Employee benefit expenses (excluding share-based payments)		80,291	69,974		67,951
Total		167,190	138,557	[1]	134,391	[1]
General and administrative costs [member]
Disclosure of general and administrative expense [line items]
Depreciation, amortization and impairments		108,252	89,835		78,229
Share-based payments		9,929	7,890	[1]	9,047	[1]
(Increase)/decrease in provision for onerous lease contracts					(184)
M&A transaction costs		4,604	2,429		11,845
Employee benefit expenses (excluding share-based payments)		16,918	16,279		16,395
Other general and administrative costs		27,487	22,124		19,059
Total		€ 167,190	€ 138,557	[1]	€ 134,391	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] "Increase/(decrease) in provision for onerous lease contracts" relates to those contracts in which we expect losses to be incurred in respect of unused data center sites over the term of the lease contract. This item is treated as "General and administrative costs".

[3] "M&A transaction costs" are costs associated with the evaluation, diligence and conclusion or termination of merger or acquisition activity. These costs are included in "General and administrative costs".

XML

Employee Benefit Expenses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of employee benefits expenses [abstract]
Average number of employees	638	574	515

XML

Employee Benefit Expenses - Employee Benefit Expense (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of employee benefits expenses [abstract]
Salaries and bonuses	€ 50,580	€ 44,556		€ 42,333
Social security charges	8,147	7,113		6,780
Contributions to defined contribution pension plans	3,063	2,571		2,273
Other personnel-related costs	8,572	7,844		7,518
Share-based payments	9,929	7,890	[1]	9,047	[1]
Employee benefits expense	€ 80,291	€ 69,974		€ 67,951

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Employee Benefit Expenses - Employee Benefit Expense Under Income Statement (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of defined benefit plans [line items]
Employee benefits expense	€ 80,291	€ 69,974	€ 67,951
Costs of sales [member]
Disclosure of defined benefit plans [line items]
Employee benefits expense	31,877	26,539	24,930
Sales and marketing costs [member]
Disclosure of defined benefit plans [line items]
Employee benefits expense	21,567	19,274	17,580
General and administrative costs [member]
Disclosure of defined benefit plans [line items]
Employee benefits expense	€ 26,847	€ 24,161	€ 25,441

XML

Finance Income And Expense - Finance Income And Expense Details (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of detail information about financial income and expenses [abstract]
Bond premium and fees in income	€ 1,188	€ 790
Bank and other interest	223	135		€ 82
Profit from sale of financial asset		281		2,289
Net foreign currency exchange gain				923
Finance income	1,411	1,206	[1]	3,294	[1]
Interest expense on Senior Secured Notes, bank and other loans	(37,706)	(33,095)		(27,094)
Interest expense on finance leases	(3,667)	(1,750)		(3,139)
Interest expense on provision for onerous lease contracts		(16)		(115)
Other financial expenses	(2,707)	(1,765)		(1,968)
Net foreign currency exchanges loss	(1,698)	(849)
Finance expense	(45,778)	(37,475)	[1]	(32,316)	[1]
Net finance expense	€ (44,367)	€ (36,269)		€ (29,022)

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Finance Income and Expense - Additional Information (Detail) € in Millions	12 Months Ended
	Dec. 31, 2016 EUR (€)
Disclosure of detail information about financial income and expenses [abstract]
Interest expense on finance leases	€ 1.4

XML

Income Tax - Summary of Income Tax Expense (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Major components of tax expense (income) [abstract]
Current taxes	€ (13,814)	€ (11,421)		€ (9,170)
Deferred taxes	(1,025)	(5,029)		(8,755)
Total income tax expense	€ (14,839)	€ (16,450)	[1]	€ (17,925)	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of income tax [abstract]
Statutory tax rate	25.00%	25.00%	25.00%
Effective tax rate	27.50%	30.00%	27.70%

XML

Income Tax - Summary of Reconciliation of Effective Tax Rate (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Net income	€ 39,067	€ 38,336	[1]	€ 46,680	[1]
Income tax expense	14,839	16,450	[1]	17,925	[1]
Profit before taxation	53,906	54,786	[1]	64,605	[1]
Income tax using Company's domestic tax rate	(13,477)	(13,697)		(16,151)
Effect of tax rates in foreign jurisdictions	(99)	(844)		(407)
Change in tax rate and legislation	554	367		548
Non-deductible expenses	(2,496)	(2,197)		(2,420)
Recognition of previously unrecognized tax losses		147		734
Prior year adjustments included in current year tax	201	(354)		211
Other	478	128		(440)
Total income tax expense	€ (14,839)	€ (16,450)	[1]	€ (17,925)	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Income Tax - Summary of Movement in Recognized Deferred Tax Assets (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	€ 30,993	€ 33,744		€ 41,259
Recognized in profit/(loss)	1,570	(4,465)		(6,523)
Recognized in equity	168	1,835		(1,224)
Acquisitions	2,764
Effects of movements in exchange rates	(130)	(121)		232
Ending balance	35,365	30,993		33,744
Offset deferred tax liabilities	(10,895)
Net deferred tax assets/(liabilities)	24,470	20,370	[1]	23,024	[1]
Property, plant and equipment, and intangibles [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	12,234	12,581		13,428
Recognized in profit/(loss)	(1,119)	(348)		(858)
Acquisitions	1,779
Effects of movements in exchange rates	(10)	1		11
Ending balance	12,884	12,234		12,581
Offset deferred tax liabilities	(6,045)
Net deferred tax assets/(liabilities)	6,839
Tax loss carryforward [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	16,997	18,356		22,912
Recognized in profit/(loss)	2,355	(3,071)		(3,553)
Recognized in equity	205	1,835		(1,224)
Acquisitions	915
Effects of movements in exchange rates	(89)	(123)		221
Ending balance	20,383	16,997		18,356
Offset deferred tax liabilities	(3,242)
Net deferred tax assets/(liabilities)	17,141
Provision onerous contracts [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance		484		1,575
Recognized in profit/(loss)		(484)		(1,091)
Ending balance				484
Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	1,762	2,323		3,344
Recognized in profit/(loss)	334	(562)		(1,021)
Recognized in equity	(37)
Acquisitions	70
Effects of movements in exchange rates	(31)	1
Ending balance	2,098	€ 1,762		€ 2,323
Offset deferred tax liabilities	(1,608)
Net deferred tax assets/(liabilities)	€ 490

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Income Tax - Summary of Movement in Recognized Deferred Tax Liability (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	€ (20,251)	€ (20,671)		€ (18,224)
Recognized in profit/(loss)	(2,595)	(564)		(2,232)
Acquisitions	(9,569)
Effects of movements in exchange rates	184	984		(215)
Ending balance	(32,231)	(20,251)		(20,671)
Offset deferred tax assets	10,895
Net deferred tax assets/(liabilities)	(21,336)	(9,628)	[1]	(9,951)	[1]
Other liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	(1,356)	(1,300)		(1,106)
Recognized in profit/(loss)	305	(56)		(194)
Ending balance	(1,051)	(1,356)		(1,300)
Offset deferred tax assets	1,608
Net deferred tax assets/(liabilities)	557
Property, plant and equipment, and intangibles [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Beginning balance	(18,895)	(19,371)		(17,118)
Recognized in profit/(loss)	(2,900)	(508)		(2,038)
Acquisitions	(9,569)
Effects of movements in exchange rates	184	984		(215)
Ending balance	(31,180)	€ (18,895)		€ (19,371)
Offset deferred tax assets	6,045
Net deferred tax assets/(liabilities)	(25,135)
Tax loss carryforward [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Offset deferred tax assets	3,242
Net deferred tax assets/(liabilities)	€ 3,242

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Income Tax - Details of Net Deferred Tax Assets (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of temporary difference for which no deferred tax asset recognized [abstract]
Deductible temporary differences, net	€ 0	€ 0	€ 34
Tax losses	0	0	180
Net deferred tax assets	€ 0	€ 0	€ 214

XML

Income Tax - Summary of Accumulated Recognized and Unrecognized Tax Losses (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Accumulated recognized and unrecognized tax	€ 88,264	€ 78,744	€ 89,711
Within one year [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Accumulated recognized and unrecognized tax			2,683
Between 1 and 5 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Accumulated recognized and unrecognized tax	25,352	3,517	3,490
After 5 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Accumulated recognized and unrecognized tax	35,164	28,146	25,817
Over 5 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Accumulated recognized and unrecognized tax	€ 27,748	€ 47,081	€ 57,721

XML

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	[1]	€ 1,156,031	€ 999,072
Ending balance		1,342,471	1,156,031	[1]	€ 999,072	[1]
Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		1,650,956	1,418,701		1,235,619
Additions		280,697	258,246		168,591
Acquisitions through business combinations		16,821
Exchange differences		(12,712)	(19,959)		16,385
Disposals		(2,105)	(6,032)		(1,894)
Ending balance		1,933,657	1,650,956		1,418,701
Accumulated depreciation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(494,925)	(419,629)		(340,435)
Depreciation		(103,585)	(87,566)		(75,276)
Exchange differences		5,383	6,238		(5,653)
Disposals		1,941	6,032		1,735
Ending balance		(591,186)	(494,925)		(419,629)
Freehold Land and Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		160,184	162,283
Ending balance		206,617	160,184		162,283
Freehold Land and Buildings [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		176,421	174,935		168,505
Additions		28,712			6,437
Acquisitions through business combinations		5,440
Exchange differences		(1)	6		(7)
Transfers		17,143	1,480
Ending balance		227,715	176,421		174,935
Freehold Land and Buildings [member] | Accumulated depreciation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(16,237)	(12,652)		(9,270)
Depreciation		(4,861)	(3,584)		(3,382)
Exchange differences			(1)
Ending balance		(21,098)	(16,237)		(12,652)
Infrastructure and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		863,917	742,788
Ending balance		997,405	863,917		742,788
Infrastructure and equipment [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		1,315,971	1,127,883		962,405
Additions		83,216	64,369		13,113
Acquisitions through business combinations		11,272
Exchange differences		(11,181)	(17,010)		14,889
Disposals		(2,045)	(5,801)		(1,221)
Transfers		137,207	146,530		138,697
Ending balance		1,534,440	1,315,971		1,127,883
Infrastructure and equipment [member] | Accumulated depreciation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(452,054)	(385,095)		(313,282)
Depreciation		(91,912)	(78,680)		(67,561)
Exchange differences		5,050	5,920		(5,332)
Disposals		1,881	5,801		1,080
Ending balance		(537,035)	(452,054)		(385,095)
Assets under construction [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		111,803	77,664
Ending balance		116,437	111,803		77,664
Assets under construction [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		111,803	77,664		74,758
Additions		160,004	184,603		140,637
Exchange differences		(1,020)	(2,454)		966
Transfers		(154,350)	(148,010)		(138,697)
Ending balance		116,437	111,803		77,664
Total data center assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		1,135,904	982,735
Ending balance		1,320,459	1,135,904		982,735
Total data center assets [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		1,604,195	1,380,482		1,205,668
Additions		271,932	248,972		160,187
Acquisitions through business combinations		16,712
Exchange differences		(12,202)	(19,458)		15,848
Disposals		(2,045)	(5,801)		(1,221)
Ending balance		1,878,592	1,604,195		1,380,482
Total data center assets [member] | Accumulated depreciation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(468,291)	(397,747)		(322,552)
Depreciation		(96,773)	(82,264)		(70,943)
Exchange differences		5,050	5,919		(5,332)
Disposals		1,881	5,801		1,080
Ending balance		(558,133)	(468,291)		(397,747)
Office equipment and other [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		20,127	16,337
Ending balance		22,012	20,127		16,337
Office equipment and other [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		46,761	38,219		29,951
Additions		8,765	9,274		8,404
Acquisitions through business combinations		109
Exchange differences		(510)	(501)		537
Disposals		(60)	(231)		(673)
Ending balance		55,065	46,761		38,219
Office equipment and other [member] | Accumulated depreciation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(26,634)	(21,882)		(17,883)
Depreciation		(6,812)	(5,302)		(4,333)
Exchange differences		333	319		(321)
Disposals		60	231		655
Ending balance		€ (33,053)	€ (26,634)		€ (21,882)

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Property, Plant and Equipment - Additional Information (Detail) € in Thousands	12 Months Ended
	Dec. 31, 2017 EUR (€) m²	Dec. 31, 2016 EUR (€)		Dec. 31, 2015 EUR (€)		Sep. 29, 2015 EUR (€)	Dec. 20, 2012 EUR (€)
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	€ 1,342,471	€ 1,156,031	[1]	€ 999,072	[1]
Financial lease agreement on carrying value	51,127	51,718		34,582
Capitalised interest on borrowing costs	3,100	3,400		2,600
Cash effect of interest capitalized	€ 3,900	2,200		3,600
AMS8 data center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Purchase of area of land | m²	22,000
PAR7 data center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Financial lease agreement on carrying value	€ 20,900
Land [member] | AMS8 data center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	14,800
Land [member] | Parcel of land in Frankfurt [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	10,700
Land [member] | PAR7 data center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value							€ 20,900
Buildings [member] | AMS8 data center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	16,800					€ 16,800
Freeholds land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	104,600	76,900		76,900
Mortgages [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	102,900	90,200		71,800
Financial Lease Agreement [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying value	€ 50,200	€ 51,300		€ 33,900

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Intangible Assets - Summary of Intangible Assets (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]
Beginning balance	€ 28,694	€ 23,194
Ending balance	99,493	28,694	€ 23,194
Cost [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	42,266	34,578	28,037
Additions	8,792	8,929	6,525
Acquisitions through business combinations	66,905
Exchange differences	(263)	(1,241)	509
Disposals			(493)
Ending balance	117,700	42,266	34,578
Accumulated amortization and impairment [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(13,572)	(11,384)	(9,041)
Amortization	(4,667)	(2,269)	(2,795)
Exchange differences	32	81	(41)
Disposals			493
Ending balance	(18,207)	(13,572)	(11,384)
Power grid rights [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	16,350	14,403
Ending balance	18,815	16,350	14,403
Power grid rights [member] | Cost [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	18,582	16,091	12,833
Additions	3,466	3,647	2,792
Exchange differences	(228)	(1,156)	466
Ending balance	21,820	18,582	16,091
Power grid rights [member] | Accumulated amortization and impairment [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(2,232)	(1,688)	(1,297)
Amortization	(773)	(544)	(391)
Ending balance	(3,005)	(2,232)	(1,688)
Software [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	11,703	8,037
Ending balance	14,407	11,703	8,037
Software [member] | Cost [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	21,519	16,322	13,039
Additions	5,326	5,282	3,733
Exchange differences	(35)	(85)	43
Disposals			(493)
Ending balance	26,810	21,519	16,322
Software [member] | Accumulated amortization and impairment [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(9,816)	(8,285)	(6,447)
Amortization	(2,619)	(1,612)	(2,290)
Exchange differences	32	81	(41)
Disposals			493
Ending balance	(12,403)	(9,816)	(8,285)
Goodwill [member]
Disclosure of detailed information about intangible assets [line items]
Ending balance	38,900
Goodwill [member] | Cost [member]
Disclosure of detailed information about intangible assets [line items]
Acquisitions through business combinations	38,900
Ending balance	38,900
Customer portfolio [member]
Disclosure of detailed information about intangible assets [line items]
Ending balance	26,838
Customer portfolio [member] | Cost [member]
Disclosure of detailed information about intangible assets [line items]
Acquisitions through business combinations	28,005
Ending balance	28,005
Customer portfolio [member] | Accumulated amortization and impairment [Member]
Disclosure of detailed information about intangible assets [line items]
Amortization	(1,167)
Ending balance	(1,167)
Other [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	641	754
Ending balance	533	641	754
Other [member] | Cost [member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	2,165	2,165	2,165
Ending balance	2,165	2,165	2,165
Other [member] | Accumulated amortization and impairment [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(1,524)	(1,411)	(1,297)
Amortization	(108)	(113)	(114)
Ending balance	€ (1,632)	€ (1,524)	€ (1,411)

XML

Intangible Assets and Goodwill - Summary of Key Assumptions Used in Calculating Recoverable Amount (Detail)	12 Months Ended
	Dec. 31, 2017
Key Assumptions Used In Calculating Recoverable Amount [Abstract]
Discount rate (pre-tax)	8.20%
Terminal value growth rate	1.10%
Budgeted Adjusted EBITDA growth rate throughout the forecast	0.00%

XML

Intangible Assets and Goodwill - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Intangible assets and goodwill [abstract]
Possible debt leveraging	20.00%
Market interest rate	3.80%

XML

Other Investments - Additional Information (Detail) - 12 months ended Dec. 31, 2017 $ in Millions	USD ($)	EUR (€)	USD ($)
Other investments 1 [abstract]
Other Investments	$ 4.5
Fair value of conversion option | €		€ 0
Conversion of loans disbursed			$ 4.0

XML

Trade and Other (Non-) Current Assets - Summary of Trade and Other Noncurrent Assets (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Trade and other non-current receivables [abstract]
Data-center-related prepaid expenses	€ 2,708	€ 3,507		€ 2,834
Rental and other supplier deposits	3,736	3,056		2,929
Deferred setup cost	2,806	1,502
Deferred financing costs		142		422
Deferred rent related stamp duties	895	379		501
Collaterized cash	3,529	3,328		4,466
Trade and other non current assets	€ 13,674	€ 11,914	[1]	€ 11,152	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade and Other (Non-) Current Assets - Summary of Trade and Other Current Assets (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Current
Trade receivables - net	€ 113,518	€ 91,451		€ 79,128
Taxes receivable	12,415	5,416		5,716
Accrued revenue	36,575	34,560		39,442
Prepaid expenses and other current assets	17,278	16,394		17,650
Trade and other current assets	€ 179,786	€ 147,821	[1]	€ 141,936	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade and Other (Non-) Current Assets - Additional Information (Detail) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Trade and other non-current receivables [abstract]
Accrued revenue balance not to be realized within 12 months	€ 18.7
Cash held as collateral	€ 4.1	€ 3.7	€ 4.9

XML

Shareholders' equity - Summary of Share Capital and Share Premium (Detail) - shares shares in Thousands		12 Months Ended
	Jan. 28, 2011	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of classes of share capital [abstract]
On issue at 1 January		70,603	69,919	69,317
Issue/conversion of shares	34,808	812	684	602
On issue at 31 December	16,250	71,415	70,603	69,919

XML

Shareholders' equity - Additional Information (Detail)		12 Months Ended
	Jan. 28, 2011 € / shares shares	Dec. 31, 2017 shares € / shares	Dec. 31, 2016 shares € / shares	Dec. 31, 2015 shares € / shares	Dec. 31, 2014 shares
Disclosure of classes of share capital [line items]
Number of new share issued	16,250,000	71,415,000	70,603,000	69,919,000	69,317,000
Reverse stock split ratio description		reverse stock split 5:1
Nominal value per share | € / shares	€ 0.10
Number of preferred shares converted into ordinary shares	34,808,000	812,000	684,000	602,000
Liquidation price per share | € / shares	€ 1.00
Number of share options exercised and vested		38,286
Preferred A Shares [Member]
Disclosure of classes of share capital [line items]
Number of preferred shares converted into ordinary shares	3,300,000
Performance shares [member]
Disclosure of classes of share capital [line items]
Number of share options exercised and vested		108,000	72,000	34,000
Ordinary shares [member]
Disclosure of classes of share capital [line items]
Number of shares authorised		200,000,000	200,000,000	200,000,000
Par value | € / shares		€ 0.10	€ 0.10	€ 0.10
Restricted shares [member] | Performance shares [member]
Disclosure of classes of share capital [line items]
Number of share options exercised and vested		800,000	500,000	400,000

XML

Earning Per Share - Summary of Profit Attributable to Ordinary Shareholders (Detail) - EUR (€) € in Thousands, shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Earnings per share [abstract]
Profit attributable to ordinary shareholders	€ 39,067	€ 38,336		€ 46,680
Weighted average number of ordinary shares at 31 December	71,089	70,349	[1]	69,579	[1]
Dilution effect of share options, restricted and performance shares on issue	432	864	[1]	895	[1]
Weighted average number of ordinary shares (diluted) at 31 December	71,521	71,213	[1]	70,474	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Earnings per share - Additional Information (Detail) - shares		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Earnings per share [abstract]
Weighted average number of ordinary shares outstanding		71,089,000	70,349,000	[1]	69,579,000	[1]
Weighted average number of ordinary shares (diluted)	[1]	71,521,000	71,213,000		70,474,000

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade Payables and Other Liabilities - Summary of Trade Payables and Other Liabilities (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Non-current
Deferred revenue	€ 7,557	€ 6,282		€ 5,272
Other non-current liabilities	7,523	5,436		6,777
Total	15,080	11,718	[1]	12,049	[1]
Current
Trade payables	47,489	23,076		25,045
Tax and social security	9,357	6,528		9,439
Customer deposits	20,878	20,671		21,208
Deferred revenue	73,262	63,974		60,700
Accrued expenses	78,770	57,043		46,103
Other current liabilities	122	107		134
Total	€ 229,878	€ 171,399	[1]	€ 162,629	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade payables and other liabilities - Additional Information (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Trade and other payables [abstract]
Trade payables	€ 229,878	€ 171,399	[1]	€ 162,629	[1]

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Trade Payables and Other Liabilities - Summary of Accrued Expenses (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Analysis of income and expense [abstract]
Data-center-related costs	€ 36,805	€ 18,752	€ 11,788
Personnel and related costs	13,273	12,261	11,709
Professional services	2,486	1,871	2,246
Customer implementation and related costs	4,492	3,081	3,346
Financing-related costs	17,909	17,498	13,454
Other	3,805	3,580	3,560
Accrued expenses	€ 78,770	€ 57,043	€ 46,103

XML

Provision for Onerous Lease Contracts - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 site
Provision onerous contracts [member] | Germany [member]
Disclosure of other provisions [line items]
Number of unused data center sites	2

XML

Provision for Onerous Lease Contracts - Summary of Provision Calculated Based on Discounted Future Contracted Payments Net of Sublease Revenues (Detail) - EUR (€) € in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Disclosure of other provisions [line items]
Current	[1]		€ 1,517
Discounted future contracted payments [member]
Disclosure of other provisions [line items]
Beginning balance		€ 1,517	4,934
Increase/(decrease) in provision			(184)
Unwinding of discount		16	115
Utilization of provision		(1,533)	(3,348)
Ending balance			1,517
Non-current		€ 0	0	€ 0
Current			1,517
Total onerous contracts provision			€ 1,517

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Borrowings - Schedule of Current and Non-Borrowings (Details) (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Non-current
Total non current borrowings	€ 724,052	€ 723,975	[1]	€ 550,812	[1]
Current
Total current borrowings	108,760	11,482	[1]	4,951	[1]
Total borrowings	832,812	735,457		555,763
Senior Secured Notes 6.0%, due 2020 [member]
Non-current
Total non current borrowings	628,141	629,327		475,503
Mortgages [member]
Non-current
Total non current borrowings	45,386	43,508		40,727
Current
Total current borrowings	8,254	10,904		3,346
Finance lease liabilities [member]
Non-current
Total non current borrowings	50,525	51,140		34,582
Current
Total current borrowings	602	€ 578
2017 Senior Secured Revolving Facility [member]
Current
Total current borrowings	€ 99,904
Other loans [member]
Current
Total current borrowings				€ 1,605

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Borrowings - Schedule of Current and Non-Borrowings (Details) (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.00%	6.00%	6.00%
Borrowings, maturity	2020	2020	2020
Senior Secured Notes 6.0%, due 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.00%
Borrowings, maturity	2020

XML

Borrowings - Additional Information - Senior Secured Notes due 2020 (Detail) - EUR (€) € in Thousands				1 Months Ended	12 Months Ended
	Apr. 14, 2016	Apr. 29, 2014	Jul. 03, 2013	Apr. 14, 2016	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]
Aggregate principal amount					€ 832,812	€ 735,457		€ 555,763
Interest rate					6.00%	6.00%		6.00%
Net proceeds of offering		€ 157,900				€ 154,808	[1]
Offering fees and expenses		2,300
Senior secured notes 6.00% due 2020 [member]
Disclosure of detailed information about borrowings [line items]
Face value of borrowings					€ 625,000	€ 625,000		€ 475,000
Aggregate principal amount	€ 475,000	325,000	€ 325,000	€ 475,000	€ 325,000
Interest rate	6.00%		6.00%	6.00%	6.00%
Net proceeds of offering				€ 155,300
Offering fees and expenses				2,100
Aggregate principal amount				150,000
Increase in nominal value premium				104,500
Senior secured notes 6.00% due 2020 [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Fixed charge ratio					2.00%
Senior secured notes 6.00% due 2020 [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Fixed charge ratio			2.00%
Leverage ratio					4.00%
6% Senior Secured Notes due 2020 Additional Note [member]
Disclosure of detailed information about borrowings [line items]
Aggregate principal amount	€ 150,000	€ 150,000		€ 150,000
Interest rate		6.00%
Net proceeds of offering	155,300	€ 157,900
Offering fees and expenses	€ 2,100	€ 2,300
Senior Secured Notes due 2017 [member]
Disclosure of detailed information about borrowings [line items]
Aggregate principal amount			€ 260,000
Proceeds of offering used to purchase senior notes					€ 260,000

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Borrowings - Additional Information - Mortgages (Detail)			1 Months Ended			12 Months Ended
	Apr. 08, 2016 EUR (€) Installment	Oct. 13, 2015 EUR (€) Installment	Apr. 30, 2014 EUR (€) Installments	Jun. 30, 2013 EUR (€)	Jan. 31, 2013 EUR (€) MortgageLoan	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)		Dec. 01, 2017 EUR (€)	Dec. 31, 2015 EUR (€)		Dec. 31, 2014 EUR (€)
Disclosure of detailed information about borrowings [line items]
Long term borrowings						€ 724,052,000	€ 723,975,000	[1]		€ 550,812,000	[1]
Borrowings interest rate						6.00%	6.00%			6.00%
Repayments of noncurrent borrowings						€ 30,000,000
Mortgages [member]
Disclosure of detailed information about borrowings [line items]
Face value of borrowings						54,300,000	€ 55,200,000					€ 44,600,000
Long term borrowings						45,386,000	€ 43,508,000			€ 40,727,000
Mortgages [member] | Interxion Real Estate IV B.V. [member]
Disclosure of detailed information about borrowings [line items]
Long term borrowings									€ 10,000,000
Principal amount repayable in annual installments						667,000
Repayments of noncurrent borrowings						€ 7,332,000
Borrowings, maturity						Dec. 31, 2022
Mortgages [member] | Bottom of range [member] | Interxion Real Estate IV B.V. [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate						0.00%
Mortgages [member] | Real Estate Property In Germany [member]
Disclosure of detailed information about borrowings [line items]
Long term borrowings		€ 15,000,000
First instalment payment date							Sep. 30, 2016
Borrowings, interest rate basis							The facility has a maturity of five years and has a variable interest rate based on EURIBOR plus 225 basis points.
Borrowings adjustment to interest rate basis		2.25%
Principal amount repayable in annual installments		€ 1,000,000
Repayments of noncurrent borrowings		€ 11,000,000
Borrowings, maturity		Sep. 30, 2020
Life of mortgage backed securities							Five years
Number of instalments | Installment		4
Mortgages [member] | PAR Three Land And PAR Five Land [member]
Disclosure of detailed information about borrowings [line items]
Number of mortgage loans | MortgageLoan					2
Long term borrowings					€ 10,000,000
Aggregate amount repayable on quarterly installments					€ 167,000
First instalment payment date							Apr. 18, 2013
Borrowings maturity period							15 years
Borrowings, interest rate basis							The mortgages have a maturity of 15 years and have a variable interest rate based on EURIBOR plus an individual margin ranging from 240 to 280 basis points.
Mortgages [member] | PAR Three Land And PAR Five Land [member] | Fixed-rate instruments [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate					75.00%
Period of interest rate					10 years
Mortgages [member] | PAR Three Land And PAR Five Land [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Borrowings adjustment to interest rate basis					2.40%
Mortgages [member] | PAR Three Land And PAR Five Land [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Borrowings adjustment to interest rate basis					2.80%
Mortgages [member] | AMS Three Property [member]
Disclosure of detailed information about borrowings [line items]
Long term borrowings				€ 6,000,000
First instalment payment date						May 01, 2014
Borrowings, interest rate basis						The mortgage has a variable interest rate based on EURIBOR plus 275 basis points.
Borrowings adjustment to interest rate basis				2.75%
Principal amount repayable in annual installments				€ 400,000
Repayments of noncurrent borrowings				€ 4,400,000
Borrowings, maturity				May 01, 2018
Debt service capacity covenant ratio				110.00%
Mortgages [member] | Data Center Property In Belgium [member]
Disclosure of detailed information about borrowings [line items]
Long term borrowings			€ 9,200,000
Aggregate amount repayable on quarterly installments			€ 153,550
First instalment payment date						Jul. 31, 2014
Borrowings, interest rate basis						The facility has a maturity of 15 years and has a variable interest rate based on EURIBOR plus 200 basis points.
Borrowings adjustment to interest rate basis			2.00%
Borrowings, maturity			Apr. 30, 2029
Life of mortgage backed securities						15 years
Number of quarterly instalments | Installments			59
Mortgages [member] | Data Center Property In Austria [member]
Disclosure of detailed information about borrowings [line items]
First instalment payment date							Apr. 30, 2016
Borrowings, interest rate basis							The facility has a maturity of 14 years and nine months, and has a variable interest rate based on EURIBOR plus 195 basis points.
Borrowings adjustment to interest rate basis	1.95%
Repayments of noncurrent borrowings	€ 91,750
Borrowings, maturity	Dec. 31, 2030
Life of mortgage backed securities							14 years and nine months
Number of monthly instalments | Installment	177
Mortgages [member] | Data Center Property In Austria [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Repayments of noncurrent borrowings	€ 76,000
Mortgages [member] | Data Center Property In Austria [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Repayments of noncurrent borrowings	€ 91,750

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Borrowings - Additional Information - Optional Redemption to Revolving Facility Agreement (Detail) - EUR (€)							1 Months Ended	12 Months Ended
	Jul. 01, 2018	Feb. 20, 2018	Jul. 28, 2017	Mar. 09, 2017	Jul. 15, 2016	Jul. 03, 2013	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 14, 2016	Dec. 31, 2015	Apr. 29, 2014
Disclosure of detailed information about borrowings [line items]
Redemption period					12-month
Borrowings redemption amount					€ 100,000
Borrowings redemption multiple amount					€ 1,000
Redemption option to senior secured notes holders								€ 100,000
Redemption option to senior secured notes holders in integral multiples								€ 1,000
Purchase price in cash equal								101.00%
Borrowings								€ 832,812,000	€ 735,457,000		€ 555,763,000
Initial Maturity				12 months
Extension in maturity date				Six-month
Revolving credit facility interest rate				EURIBOR (subject to a zero percent floor) plus a margin of 2.25% per annum
Senior secured revolving facility			€ 100,000,000
Senior secured revolving facility, extended maturity date			Dec. 31, 2018
2017 Senior Secured Revolving Facility [member]
Disclosure of detailed information about borrowings [line items]
Initial Maturity				12 months
Extension in maturity date				Six-month
Revolving credit facility interest rate				EURIBOR (subject to a zero percent floor) plus a margin of 2.25% per annum
Senior secured revolving facility			€ 100,000,000
Senior secured revolving facility, extended maturity date			Dec. 31, 2018
Senior secured notes 6.00% due 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings						€ 325,000,000		€ 325,000,000		€ 475,000,000		€ 325,000,000
Revolving facility agreement [member]
Disclosure of detailed information about borrowings [line items]
Consolidated fixed charge ratio								4.92%
Consolidated senior leverage ratio								3.60%
Revolving facility agreement [member] | Floor rate [member]
Disclosure of detailed information about borrowings [line items]
Consolidated fixed charge ratio								2.00%
Voting shares [member]
Disclosure of detailed information about borrowings [line items]
Ownership percentage of voting stock of company, change of control threshold								50.00%
Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Redemption maturity period					Ten days
Bottom of range [member] | Senior secured notes 6.00% due 2020 [member]
Disclosure of detailed information about borrowings [line items]
Consolidated fixed charge ratio								2.00%
Bottom of range [member] | Revolving facility agreement [member]
Disclosure of detailed information about borrowings [line items]
Financial covenant leverage ratio							4.00%
Bottom of range [member] | Events after reporting period [Member]
Disclosure of detailed information about borrowings [line items]
Guarantor coverage percentage of adjusted EBITDA		80.00%
Top of range [member]
Disclosure of detailed information about borrowings [line items]
Redemption maturity period					60 days
Revolving credit facility interest rate				EURIBOR plus a margin of 3.25% per annum
Top of range [member] | 2017 Senior Secured Revolving Facility [member]
Disclosure of detailed information about borrowings [line items]
Revolving credit facility interest rate				EURIBOR (subject to a zero percent floor) plus a margin of 3.25% per annum
Top of range [member] | Senior secured notes 6.00% due 2020 [member]
Disclosure of detailed information about borrowings [line items]
Consolidated fixed charge ratio						2.00%
Top of range [member] | Revolving facility agreement [member]
Disclosure of detailed information about borrowings [line items]
Consolidated senior leverage ratio								4.00%
Financial covenant leverage ratio							4.75%	4.75%
Top of range [member] | Revolving facility agreement [member] | Scenario, Forecast [Member]
Disclosure of detailed information about borrowings [line items]
Financial covenant leverage ratio	4.00%
Top of range [member] | Events after reporting period [Member]
Disclosure of detailed information about borrowings [line items]
Guarantor coverage percentage of adjusted EBITDA		85.00%

XML

Borrowings - Schedule of Optional Redemption Price Expressed as Percentage (Detail)	Dec. 31, 2017
2017 [member]
Description of redemption option [line items]
Redemption Price	103.00%
2018 [member]
Description of redemption option [line items]
Redemption Price	101.50%
2019 and thereafter [member]
Description of redemption option [line items]
Redemption Price	100.00%

XML

Borrowings - Summary of Reconciliation of Movements of Liabilities to Cash Flows Arising from Financing Activities (Detail) € in Thousands	12 Months Ended
	Dec. 31, 2017 EUR (€)
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	€ 1,284,226
Changes from financing cash flows
Proceeds from exercised options	6,969
Proceeds from mortgages	9,950
Repayment of mortgages	(10,848)
Proceeds from Revolving Facilities	129,521
Repayment of Revolving Facilities	(30,000)
Finance lease obligation	(995)
Total changes from financing cash flows	104,597
Amortized borrowing costs	(677)
Interest expense	404
Total liability-related	(273)
Total equity-related other changes	40,990
Ending balance	1,429,540
Senior Secured Notes 6.0%, due 2020 [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	629,327
Changes from financing cash flows
Amortized borrowing costs	(1,186)
Total liability-related	(1,186)
Ending balance	628,141
Mortgages [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	54,412
Changes from financing cash flows
Proceeds from mortgages	9,950
Repayment of mortgages	(10,848)
Total changes from financing cash flows	(898)
Amortized borrowing costs	126
Total liability-related	126
Ending balance	53,640
Finance lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	51,718
Changes from financing cash flows
Finance lease obligation	(995)
Total changes from financing cash flows	(995)
Interest expense	404
Total liability-related	404
Ending balance	51,127
Revolving facility agreement [member]
Changes from financing cash flows
Proceeds from Revolving Facilities	129,521
Repayment of Revolving Facilities	(30,000)
Total changes from financing cash flows	99,521
Amortized borrowing costs	383
Total liability-related	383
Ending balance	99,904
Share capital [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	7,060
Changes from financing cash flows
Proceeds from exercised options	55
Total changes from financing cash flows	55
Total equity-related other changes	26
Ending balance	7,141
Share premium [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	519,604
Changes from financing cash flows
Proceeds from exercised options	6,914
Total changes from financing cash flows	6,914
Total equity-related other changes	5,724
Ending balance	532,242
Foreign currency translation reserve [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	9,988
Changes from financing cash flows
Total equity-related other changes	(7,040)
Ending balance	2,948
Hedging Reserve [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	(243)
Changes from financing cash flows
Total equity-related other changes	74
Ending balance	(169)
Accumulated profit/(deficit) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	12,360
Changes from financing cash flows
Total equity-related other changes	42,206
Ending balance	€ 54,566

XML

Borrowings - Maturity Profile of the Gross Amounts of Senior Secured Notes and Mortgages (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Description of redemption option [line items]
Maturity amount	€ 779,316	€ 680,239	€ 519,646
Undrawn borrowing facilities	100,000
Within one year [member]
Description of redemption option [line items]
Maturity amount	104,400	7,332
Undrawn borrowing facilities	100,000
Between 1 and 5 years [member]
Description of redemption option [line items]
Maturity amount	648,000	643,800	503,199
Undrawn borrowing facilities	100,000
After 5 years [member]
Description of redemption option [line items]
Maturity amount	€ 26,916	€ 29,107	€ 16,447

XML

Borrowings - Additional Information - Covenants (Detail)			12 Months Ended
	Jul. 01, 2018	Feb. 20, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Senior secured notes 6.00% due 2020 [member]
Disclosure of detailed information about borrowings [line items]
Fixed charges ratio			4.92	4.51	5.14
Leverage ratio			3.60	3.26	2.94
Net debt ratio			3.60%	3.26%	2.94%
Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Earnings before income taxes depreciation amortization and restructuring to fixed charge ratio			2.00%
Earnings before income taxes depreciation amortization and restructuring to leverage ratio			1.00
Fixed charges ratio			2.00
Bottom of range [member] | Scenario, Forecast [Member]
Disclosure of detailed information about borrowings [line items]
Earnings before income taxes depreciation amortization and restructuring to leverage ratio	1.00
Bottom of range [member] | Events after reporting period [Member]
Disclosure of detailed information about borrowings [line items]
Guarantor coverage percentage of adjusted EBITDA		80.00%
Top of range [member]
Disclosure of detailed information about borrowings [line items]
Earnings before income taxes depreciation amortization and restructuring to subsidiaries			4.00%
Earnings before income taxes depreciation amortization and restructuring to leverage ratio			4.75
Leverage ratio			4.00
Top of range [member] | Scenario, Forecast [Member]
Disclosure of detailed information about borrowings [line items]
Earnings before income taxes depreciation amortization and restructuring to leverage ratio	4.00
Top of range [member] | Events after reporting period [Member]
Disclosure of detailed information about borrowings [line items]
Guarantor coverage percentage of adjusted EBITDA		85.00%

XML

Borrowings - Financial Lease Liabilities Relate to the Acquisition of Property, Plant and Equipment (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gross lease liabilities:
Gross lease liabilities	€ 70,492	€ 75,394	€ 53,244
Finance lease future interest payments	1,936,519	23,676	18,662
Finance lease Liabilities	51,127	51,718	34,582
Within one year [member]
Gross lease liabilities:
Lease liabilities	4,389	4,346	2,990
Finance lease future interest payments	3,693	3,898	3,374
Finance lease Liabilities	696	448	(384)
Between 1 and 5 years [member]
Gross lease liabilities:
Lease liabilities	29,625	31,904	30,230
Finance lease future interest payments	10,218	11,897	11,129
Finance lease Liabilities	19,407	20,007	19,101
After 5 years [member]
Gross lease liabilities:
Lease liabilities	36,478	39,144	20,024
Finance lease future interest payments	5,454	7,881	4,159
Finance lease Liabilities	€ 31,024	€ 31,263	€ 15,865

XML

Borrowings - Additional Information - Financial Lease Liabilities and Other Loans (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2017	Dec. 31, 2015		Sep. 29, 2015	Aug. 31, 2014	Dec. 20, 2012
Disclosure of detailed information about borrowings [line items]
Carrying value	€ 1,156,031	[1]	€ 1,342,471	€ 999,072	[1]
Loan bore interest rate per annum	6.00%		6.00%	6.00%
AMS8 data center [member] | Buildings [member]
Disclosure of detailed information about borrowings [line items]
Carrying value			€ 16,800			€ 16,800
AMS8 data center [member] | Land [member]
Disclosure of detailed information about borrowings [line items]
Carrying value			€ 14,800
AMS7 data center [member] | Buildings [member]
Disclosure of detailed information about borrowings [line items]
Carrying value of building amounts							€ 6,700
AMS7 data center [member] | Land [member]
Disclosure of detailed information about borrowings [line items]
Carrying value of land amounts							€ 5,800
PAR7 data center [member] | Land [member]
Disclosure of detailed information about borrowings [line items]
Carrying value								€ 20,900
Unused data center [member] | Germany [member]
Disclosure of detailed information about borrowings [line items]
Balance of landlord loan				€ 1,600
Loan bore interest rate per annum	6.00%
Borrowings maturity	Repaid in 2016

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Financial Instruments - Schedule of Credit Risk Exposure (Detail) - Credit risk [member] - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	€ 200,059	€ 250,631	€ 180,053
Accrued revenue [Member]
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	36,575	34,560	39,442
Rental and other supplier deposits [Member]
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	3,736	3,056	2,929
Other investments [Member]
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	3,693	1,942
Collaterized cash [Member]
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	4,053	3,729	4,868
Cash and cash equivalents [Member]
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	38,484	115,893	53,686
Trade receivables [member]
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	€ 113,518	€ 91,451	€ 79,128

XML

Financial Instruments - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 EUR (€) Mortgages	Dec. 31, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Apr. 14, 2016	Dec. 31, 2015 EUR (€)	Dec. 31, 2014 EUR (€)	Jul. 03, 2013
Disclosure of detailed information about financial instruments [line items]
Interest rate	6.00%	6.00%	6.00%		6.00%
Changes in interest rates payables basis points	100 basis points
Fair value	€ 51,100,000
Number of mortgage | Mortgages	2
Senior secured notes 6.00% due 2020 [member]
Disclosure of detailed information about financial instruments [line items]
Interest rate	6.00%	6.00%		6.00%			6.00%
Maturity year	2020
Market price	€ 103.552		€ 105.045		€ 105.780
Fair value	647,000,000		657,000,000		502,000,000
Nominal value	625,000,000		625,000,000		475,000,000
Mortgages [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	53,600,000
Nominal value	54,300,000		55,200,000			€ 44,600,000
Financial leases [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	€ 54,300,000
Variable-rate instruments [member]
Disclosure of detailed information about financial instruments [line items]
Floating interest rate of EURIBOR plus an individual margin	240 to 280 basis points
Variable interest rate	EURIBOR
Interest rate	75.00%	75.00%
Term of mortgage secured loan outstanding	Ten years
Deferred revenue [member]
Disclosure of detailed information about financial instruments [line items]
Credit exposure limit on trade receivables	€ 80,800,000		€ 70,300,000		€ 66,000,000
Level 3 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value | $		$ 4.0
Level 3 [member] | Other Investment [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value | $		4.5
Euro [member]
Disclosure of detailed information about financial instruments [line items]
Strengthening percentage against currencies	10.00%
weakening percentage against currencies	10.00%
Credit risk [member] | Financial Assets Balance [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of balance exposed to credit risk	16.00%
Credit exposure | $		$ 200.1
Credit risk [member] | Customer Balance [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of balance exposed to credit risk	19.00%

XML

Financial Instruments - Schedule of Credit Risk Exposure for Trade Receivables (Detail) - Credit risk [member] - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Credit Risk Exposure For Trade Receivables [Line Items]
Credit risk exposure for trade receivables	€ 113,518	€ 91,451	€ 79,128
UK, France, Germany and The Netherlands [member]
Disclosure Of Credit Risk Exposure For Trade Receivables [Line Items]
Credit risk exposure for trade receivables	88,634	71,099	62,448
Rest of Europe [member]
Disclosure Of Credit Risk Exposure For Trade Receivables [Line Items]
Credit risk exposure for trade receivables	23,995	19,807	16,246
Corporate [member]
Disclosure Of Credit Risk Exposure For Trade Receivables [Line Items]
Credit risk exposure for trade receivables	€ 889	€ 545	€ 434

XML

Financial Instruments - Schedule of Aging of Trade Receivables (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial assets that are either past due or impaired [line items]
Gross	€ 114,109	€ 91,809	€ 79,320
Allowance	591	358	192
Not past due [member]
Disclosure of financial assets that are either past due or impaired [line items]
Gross	88,530	69,771	66,016
Past due 0-30 days [member]
Disclosure of financial assets that are either past due or impaired [line items]
Gross	9,448	12,027	7,569
Past due 31-120 days [member]
Disclosure of financial assets that are either past due or impaired [line items]
Gross	13,111	7,329	3,589
Allowance	39	8	20
Past due 120 days-1 year [member]
Disclosure of financial assets that are either past due or impaired [line items]
Gross	2,295	2,358	1,797
Allowance	223	234	111
More than 1 year [member]
Disclosure of financial assets that are either past due or impaired [line items]
Gross	725	324	349
Allowance	€ 329	€ 116	€ 61

XML

Financial Instruments - Schedule of Allowance for Impairment (Detail) - Trade receivables [member] - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Allowance For Impairment [Line Items]
Beginning balance	€ 358	€ 192	€ 273
Impairment loss recognized	316	285	144
Write-offs	(83)	(119)	(225)
Ending balance	€ 591	€ 358	€ 192

XML

Financial Instruments - Schedule of Contractual Maturities of Financial Liabilities (Detail) - Liquidity risk [member] - EUR (€) € in Thousands		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		€ 978,320	€ 831,260	€ 645,506
Senior secured notes 6.00% due 2020 [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		628,141	629,327	475,503
Mortgages [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		53,640	54,412	44,073
Finance lease liabilities [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		51,127	51,718	34,582
Trade and other payables [Member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities	[1]	145,412	95,803	89,743
2017 Senior Secured Revolving Facility [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		100,000
Other loans [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities				1,605
Contractual cash flows [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		1,113,088	1,006,989	811,864
Contractual cash flows [member] | Senior secured notes 6.00% due 2020 [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		737,500	775,000	617,500
Contractual cash flows [member] | Mortgages [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		59,684	60,792	49,748
Contractual cash flows [member] | Finance lease liabilities [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		70,492	75,394	53,244
Contractual cash flows [member] | Trade and other payables [Member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities	[1]	145,412	95,803	89,743
Contractual cash flows [member] | 2017 Senior Secured Revolving Facility [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		100,000
Contractual cash flows [member] | Other loans [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities				1,629
Within one year [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		296,494	149,607	127,328
Within one year [member] | Senior secured notes 6.00% due 2020 [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		37,500	37,500	28,500
Within one year [member] | Mortgages [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		9,380	12,137	4,466
Within one year [member] | Finance lease liabilities [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		4,389	4,346	2,990
Within one year [member] | Trade and other payables [Member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities	[1]	145,225	95,624	89,743
Within one year [member] | 2017 Senior Secured Revolving Facility [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		100,000
Within one year [member] | Other loans [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities				1,629
Between 1 and 5 years [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		762,800	798,410	653,350
Between 1 and 5 years [member] | Senior secured notes 6.00% due 2020 [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		700,000	737,500	589,000
Between 1 and 5 years [member] | Mortgages [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		33,149	28,980	34,120
Between 1 and 5 years [member] | Finance lease liabilities [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		29,625	31,904	30,230
Between 1 and 5 years [member] | Trade and other payables [Member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities	[1]	26	26
After 5 years [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		53,794	58,972	31,186
After 5 years [member] | Mortgages [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		17,155	19,675	11,162
After 5 years [member] | Finance lease liabilities [member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities		36,478	39,144	€ 20,024
After 5 years [member] | Trade and other payables [Member]
Disclosure of contractual maturities of financial liabilities [Line Items]
Financial liabilities	[1]	€ 161	€ 153

[1] The carrying amount excludes accrued interest on Senior Secured Notes and mortgages, deferred revenues and rental holidays.

XML

Financial Instruments - Schedule of Foreign Exchange Rates (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
GBP [member]
Disclosure of effect of changes in foreign exchange rates [line items]
Average foreign exchange rate	1.141	1.220	1.379
Closing foreign exchange rate	1.126	1.167	1.357
CHF [Member]
Disclosure of effect of changes in foreign exchange rates [line items]
Average foreign exchange rate	0.897	0.918	0.937
Closing foreign exchange rate	0.855	0.931	0.923
DKK [Member]
Disclosure of effect of changes in foreign exchange rates [line items]
Average foreign exchange rate	0.134	0.134	0.134
Closing foreign exchange rate	0.134	0.135	0.134
SEK [Member]
Disclosure of effect of changes in foreign exchange rates [line items]
Average foreign exchange rate	0.104	0.106	0.107
Closing foreign exchange rate	0.102	0.104	0.109

XML

Financial Instruments - Schedule of Sensitivity Analysis (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
GBP [member]
Disclosure Of Sensitivity Analysis [Line Items]
Increase (decrease) in equity	€ (5,148)	€ (3,490)	€ (3,848)
Increase (decrease) in profit (loss)	(1,712)	(127)	(1,290)
CHF [Member]
Disclosure Of Sensitivity Analysis [Line Items]
Increase (decrease) in equity	(4,755)	(4,990)	(4,757)
Increase (decrease) in profit (loss)	(148)	(186)	(148)
DKK [Member]
Disclosure Of Sensitivity Analysis [Line Items]
Increase (decrease) in equity	(2,512)	(2,268)	(2,042)
Increase (decrease) in profit (loss)	(246)	(211)	(186)
SEK [Member]
Disclosure Of Sensitivity Analysis [Line Items]
Increase (decrease) in equity	(1,348)	(1,179)	(356)
Increase (decrease) in profit (loss)	€ (196)	€ 38	€ (137)

XML

Financial Instruments - Schedule of Financial Instruments by Type of Interest Rate (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	€ 832,812	€ 735,457	€ 555,763
Fixed-rate instruments [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	684,195	686,445	517,560
Fixed-rate instruments [member] | Senior Secured Notes [Member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	628,141	629,327	475,503
Fixed-rate instruments [member] | Finance lease liabilities [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	51,127	51,718	34,582
Fixed-rate instruments [member] | Mortgages [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	4,927	5,400	5,870
Fixed-rate instruments [member] | Other loans [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings			1,605
Variable-rate instruments [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	148,617	49,012	38,203
Variable-rate instruments [member] | Mortgages [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	48,713	€ 49,012	€ 38,203
Variable-rate instruments [member] | 2017 Senior Secured Revolving Facility [member]
Disclosure of financial instruments by type of interest rate [line items]
Borrowings	€ 99,904

XML

Financial Instruments - Schedule of Changes in Interest Rates of Financial Instruments by Basis points (Detail) - Variable-rate instruments [member] - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial instruments by type of interest rate [line items]
Increase in profit or loss	€ (1,021)	€ (478)	€ (261)
Decrease in profit or loss	1,021	478	261
Increase in equity	(76)	(84)	(91)
Decrease in equity	€ 76	€ 84	€ 91

XML

Financial Instruments - Schedule of Fair Value of Assets and Liabilities (Detail) € in Thousands, $ in Millions	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2015 EUR (€)
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	€ (51,100)
Senior secured notes 6.00% due 2020 [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(647,000)		€ (657,000)	€ (502,000)
Financial leases [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(54,300)
Mortgages [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(53,600)
Carrying value [Member] | Senior secured notes 6.00% due 2020 [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(628,141)		(629,327)	(475,503)
Carrying value [Member] | 2017 Senior Secured Revolving Facility [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(99,904)
Carrying value [Member] | Financial leases [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(51,127)		(51,718)	(34,582)
Carrying value [Member] | Mortgages [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(53,640)		(54,412)	(44,073)
Carrying value [Member] | Other Investment [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability			1,942
Financial asset	3,693
Carrying value [Member] | Conversion option [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial asset	0		0
Carrying value [Member] | Interest rate swap [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(255)		(367)	(321)
Level 1 [Member] | Senior secured notes 6.00% due 2020 [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(647,000)		(657,000)	(502,000)
Level 2 [Member] | 2017 Senior Secured Revolving Facility [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(99,904)
Level 2 [Member] | Financial leases [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(54,282)		(55,625)	(41,012)
Level 2 [Member] | Mortgages [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(53,640)		(54,412)	(44,073)
Level 2 [Member] | Other Investment [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability			1,942
Financial asset	3,693
Level 2 [Member] | Interest rate swap [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial liability	(255)		(367)	€ (321)
Level 3 [member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial asset | $		$ 4.0
Level 3 [member] | Other Investment [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial asset | $		$ 4.5
Level 3 [member] | Conversion option [Member]
Disclosure Of Fair Values And Hierarchy [Line Items]
Financial asset	€ 0		€ 0

XML

Financial Instruments - Schedule of Net Debt to Equity Ratio (Detail) € in Thousands	12 Months Ended
	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)		Dec. 31, 2015 EUR (€)		Dec. 31, 2014 EUR (€)
Capital management [abstract]
Total liabilities	€ 1,105,343	€ 933,896	[1]	€ 744,647	[1]	€ 736,958
Less: cash	(38,484)	(115,893)		(53,686)
Net debt	1,066,859	818,003		690,961
Equity
Total equity	€ 596,728	€ 548,769	[1]	€ 507,417	[1],[2],[3]	€ 436,145
Ratio of Total liabilities minus Cash and cash equivalents, divided by Shareholders'equity:	1.79	1.49		1.36

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] Since no minority shareholders in Group equity exist, the Group equity is entirely attributable to the parent's shareholders.

[3] The accompanying notes form an integral part of these consolidated financial statements.

XML

Share-based Payments - Schedule of Terms and Conditions of Grants Under Option Plans (Detail) - 2011 and 2013 Option Plans [member] Options in Thousands	Dec. 31, 2017 USD ($) Options	Dec. 31, 2016 Options	Dec. 31, 2015 Options	Dec. 31, 2014 Options
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	330	865	1,264	1,641
Exercisable	228	689	1,030
Executive Director [member] | Grant date 2011 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	88
Exercisable	88
Senior employees [member] | Grant date 2012 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	$ 20.50
Outstanding	1
Exercisable	1
Senior employees [member] | Grant date 2013 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	4
Exercisable	4
Senior employees [member] | Grant date 2014 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	$ 17.50
Outstanding	82
Exercisable	77
Senior employees [member] | Grant date 2015 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	59
Exercisable	32
Senior employees [member] | Grant date 2016 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	74
Exercisable	26
Senior employees [member] | Grant date 2017 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	22
Bottom of range [member] | Executive Director [member] | Grant date 2011 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	$ 13.00
Bottom of range [member] | Senior employees [member] | Grant date 2013 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	10.00
Bottom of range [member] | Senior employees [member] | Grant date 2015 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	24.60
Bottom of range [member] | Senior employees [member] | Grant date 2016 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	27.14
Bottom of range [member] | Senior employees [member] | Grant date 2017 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	35.60
Top of range [member] | Executive Director [member] | Grant date 2011 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	14.65
Top of range [member] | Senior employees [member] | Grant date 2013 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	15.00
Top of range [member] | Senior employees [member] | Grant date 2014 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	17.05
Top of range [member] | Senior employees [member] | Grant date 2015 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	27.26
Top of range [member] | Senior employees [member] | Grant date 2016 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	34.00
Top of range [member] | Senior employees [member] | Grant date 2017 [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price | $	$ 45.84

XML

Share-Based Payments - Additional Information (Detail)										1 Months Ended				3 Months Ended	12 Months Ended						24 Months Ended
	Jan. 01, 2021	Jan. 01, 2020 shares	Jan. 01, 2019 shares	May 04, 2018 shares	Apr. 18, 2018 shares	Jun. 30, 2017 EUR (€) shares	May 13, 2017 shares	Jun. 24, 2016 EUR (€) shares	Jun. 30, 2015 EUR (€) shares	Jan. 31, 2018 shares	Feb. 28, 2017 shares	Jan. 31, 2017 shares	Feb. 28, 2016 shares	Mar. 31, 2015	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 EUR (€) shares yr	Dec. 31, 2016 EUR (€) shares yr	Dec. 31, 2015 EUR (€) shares yr	Dec. 31, 2014 shares Person	Dec. 31, 2018 shares	Mar. 01, 2017	Jan. 01, 2017 shares	Mar. 01, 2016
Disclosure of share based payments [line items]
Share option vesting period																	Four years	Four years
Share option exercise period | yr																		8
Vesting percentage after one year																	25.00%
Vesting percentage quarterly																	6.25%
Number of restricted shares granted																		61,469	68,639
Number of shares granted each																	34,320
Number of restricted shares vested																	38,286
Final performance share award																		38,286
Share option vesting percentage																	25.00%
Employee benefits expense | €																	€ 80,291,000	€ 69,974,000	€ 67,951,000
Expected volatility of share performance period																	5 years
One-year holding discount used as input for the performance share valuation in the Monte Carlo valuation model																	5.50%
Key management [member]
Disclosure of share based payments [line items]
Final performance share award																		36,514
Percentage of performance shares awarded																		50.00%
Number of performance shares vested																		18,257
Percentage of performance shares awarded remaining balance																		50.00%
Number of performance shares awarded reaming																		36,512
Number of actual performance shares awarded																		33,292
Performance shares [member]
Disclosure of share based payments [line items]
Number of restricted shares granted																	62,000	196,000	163,000
Number of shares granted each																	204,000	253,000	129,000
Number of shares cancelled due to resignation																	3,000
Number of restricted shares vested																	108,000	72,000	34,000
Events after reporting period [Member]
Disclosure of share based payments [line items]
Number of performance shares awarded forfeited										14,828
Events after reporting period [Member] | Key management [member]
Disclosure of share based payments [line items]
Number of performance shares vested			10,642	16,646
Percentage of performance shares vested				50.00%
2013 option plan [member]
Disclosure of share based payments [line items]
Number of conditional performance shares awarded												108,213
2017 Plan [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Final performance share award										61,405											24,358
Percentage of performance shares awarded	50.00%	50.00%														50.00%					50.00%
Number of performance shares awarded reaming										38,228
Two thousand and sixteen plan [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Final performance share award		20,252	20,255		27,004
Percentage of performance shares awarded		50.00%	50.00%		150.00%
Number of performance shares awarded forfeited										27,004
Key management and Executive Director [member]
Disclosure of share based payments [line items]
Final performance share award													149,600
Key management and Executive Director [member] | 2017 Plan [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Final performance share award										46,577
Executive Director [member] | 2017 Plan [member]
Disclosure of share based payments [line items]
Final performance share award							61,469										46,808
Percentage of performance shares awarded																	100.00%
Percentage of performance shares vested	50.00%	50.00%
Executive Director [member] | 2017 Plan [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Percentage of performance shares vested		50.00%	50.00%
Number of performance shares awarded reaming										27,004
M.V. Josh Joshi [member] | Performance shares [member] | Key management [member]
Disclosure of share based payments [line items]
Number of performance shares awarded forfeited										6,004
Key management [member] | Two thousand and sixteen plan [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Number of performance shares awarded reaming										11,224
Restricted shares [member]
Disclosure of share based payments [line items]
Weighted average remaining contractual life | yr																	2.5	1.9	2.1
Restricted shares [member] | Key management [member]
Disclosure of share based payments [line items]
Number of restricted shares granted																	10,000	20,000
Restricted shares [member] | Performance shares [member]
Disclosure of share based payments [line items]
Number of restricted shares vested																	800,000	500,000	400,000
Restricted shares [member] | Non-executive directors [member]
Disclosure of share based payments [line items]
Number of restricted shares granted																			75,000	9,980
Number of shares granted each			10,000																	1,996				50,000
Number of shares cancelled due to resignation																				3,992
Number of person resigned | Person																				2
Number of restricted shares vested									5,988	5,000		5,000		25,000
Number of outstanding restricted shares to be vest																						25,000
Restricted shares [member] | Non-executive directors [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Number of restricted shares vested										5,000
Number of outstanding restricted shares to be vest		5,000	5,000
Restricted shares [member] | Non-executive directors [member] | 2013 option plan [member]
Disclosure of share based payments [line items]
Number of restricted shares granted						3,984		4,936	6,460
Number of shares granted each						996		1,234	1,615
Number of shares granted value | €						€ 40,000		€ 40,000	€ 40,000
2015 Annual General Meeting [member] | Executive Director [member]
Disclosure of share based payments [line items]
Final performance share award																		38,286
Percentage of performance shares awarded																		50.00%
Number of performance shares vested																		19,143					19,143
2015 Annual General Meeting [member] | Executive Director [member] | Key management [member]
Disclosure of share based payments [line items]
Percentage of performance shares vested																	50.00%
2015 Annual General Meeting [member] | Executive Director [member] | Events after reporting period [Member] | Key management [member]
Disclosure of share based payments [line items]
Percentage of performance shares vested			50.00%
2015 Annual General Meeting [member] | Executive Director [member] | 2017 Plan [member]
Disclosure of share based payments [line items]
Percentage of performance share adjusted for new plan							50.00%
Number of shares adjusted for new plan							34,320
Two Thousand Fifteen Performance Share Awards [Member] | Key management [member]
Disclosure of share based payments [line items]
Final performance share award																	60,060
Two Thousand Fifteen Performance Share Awards [Member] | Key management [member] | First Installment [member]
Disclosure of share based payments [line items]
Number of other equity instruments expected to vest in share-based payment arrangement																	30,030
Two Thousand Fifteen Performance Share Awards [Member] | Events after reporting period [Member] | Key management [member] | Second Installment [member]
Disclosure of share based payments [line items]
Number of other equity instruments expected to vest in share-based payment arrangement			30,030
Two thousand seventeen annual general meeting [member] | 2017 Plan [member] | Key management and Executive Director [member]
Disclosure of share based payments [line items]
Final performance share award											76,456
Percentage of performance shares awarded																	50.00%
Two thousand seventeen annual general meeting [member] | Two thousand and sixteen plan [member] | Key management and Executive Director [member]
Disclosure of share based payments [line items]
Final performance share award																	38,228
Percentage of performance shares awarded																	50.00%
Number of performance shares vested				19,114													19,114
Share based payment arrangements [member] | Performance shares [member]
Disclosure of share based payments [line items]
Employee benefits expense | €																	€ 9,900,000	€ 7,900,000	€ 9,000,000
Share based payments related to taxes and social security | €																	€ 1,000,000	€ 200,000	€ 600,000
Two thousand eighteen annual general meeting [member] | 2017 Plan [member] | Events after reporting period [Member]
Disclosure of share based payments [line items]
Final performance share award															24,362	24,362	48,720
Percentage of performance shares awarded																	50.00%
Number of performance shares awarded reaming															12,181	12,181					12,181

XML

Share-based Payments - Schedule of Number and Weighted Average Exercise Price of Share Options Outstanding (Detail) Options in Thousands	12 Months Ended
	Dec. 31, 2017 EUR (€) Options	Dec. 31, 2016 EUR (€) Options	Dec. 31, 2015 EUR (€) Options
2008 Option Plan [member]
Disclosure of sharebased payment [line items]
Weighted average exercise price outstanding at 1 January | €			€ 7.19
Weighted average exercise price exercised | €			7.19
Weighted average exercise price expired | €	€ 0	€ 0	€ 0
Number of options outstanding at 1 January | Options			14
Number of options exercised | Options			(14)
Number of options expired | Options	0	0	0
2011 and 2013 Option Plans [member]
Disclosure of sharebased payment [line items]
Weighted average exercise price outstanding at 1 January | €	€ 16.70	€ 14.98	€ 14.35
Weighted average exercise price granted | €	37.91	31.20	25.17
Weighted average exercise price exercised | €	14.13	14.90	14.23
Weighted average exercise price expired | €	0	0	0
Weighted average exercise price forfeited | €	30.67	20.49	19.29
Weighted average exercise price outstanding - 31 December | €	22.30	16.70	14.98
Weighted average exercise price exercisable - 31 December | €	€ 18.34	€ 14.22	€ 14.24
Number of options outstanding at 1 January | Options	865	1,264	1,641
Number of options granted | Options	30	94	90
Number of options exercised | Options	(550)	(479)	(423)
Number of options expired | Options	0	0	0
Number of options forfeited | Options	15	14	44
Number of options outstanding - 31 December | Options	330	865	1,264
Number of options exercisable - 31 December | Options	228	689	1,030

XML

Share-based Payments - Schedule of Number and Weighted Average Fair Value of Restricted Shares (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Disclosure of sharebased payment [line items]
Number of shares, opening balance
Number of shares, granted		61,469	68,639
Number of shares, vested	(38,286)
Number of shares, ending balance	34,320
Restricted shares [member]
Disclosure of sharebased payment [line items]
Number of shares, opening balance | shares	253,000	308,000	272,000
Number of shares, granted | shares	104,000	92,000	158,000
Number of shares, vested | shares	(147,000)	(124,000)	(118,000)
Number of shares, forfeited | shares	(40,000)	(23,000)	(4,000)
Number of shares, ending balance | shares	170,000	253,000	308,000
Weighted average grant date value, opening balance | $	$ 29.51	$ 25.76	$ 24.16
Weighted average grant date value, granted | $	47.14	35.49	28.02
Weighted average grant date value, vested | $	27.84	25.66	25.05
Weighted average grant date value, forfeited | $	30.98	23.67	27.38
Weighted average grant date value, ending balance | $	$ 41.39	$ 29.51	$ 25.76

XML

Share-based Payments - Schedule of Number and Weighted Average Fair Value of Performance Shares (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Disclosure of sharebased payment [line items]
Number of shares, opening balance
Number of shares, granted		61,469	68,639
Number of shares, vested	(38,286)
Number of shares, ending balance	34,320
Performance shares [member]
Disclosure of sharebased payment [line items]
Number of shares, opening balance | shares	253,000	129,000
Number of shares, granted | shares	62,000	196,000	163,000
Number of shares, vested | shares	(108,000)	(72,000)	(34,000)
Number of shares, forfeited | shares	(3,000)
Number of shares, ending balance | shares	204,000	253,000	129,000
Weighted average grant date value, opening balance | $	$ 27.92	$ 23.94
Weighted average grant date value, granted | $	38.80	30.42	$ 24.33
Weighted average grant date value, vested | $	29.37	27.63	25.77
Weighted average grant date value, forfeited | $	21.20
Weighted average grant date value, ending balance | $	$ 30.55	$ 27.92	$ 23.94

XML

Share-based Payments - Schedule of Weighted Average Fair Value Grant Date of Options Granted During Period Using Black-Scholes Valuation Model (Detail)	12 Months Ended
	Dec. 31, 2017 EUR (€) yr	Dec. 31, 2016 EUR (€) yr	Dec. 31, 2015 EUR (€) yr
Disclosure of sharebased payment [line items]
Expected life weighted average | yr		8
Black-Scholes valuation model [member]
Disclosure of sharebased payment [line items]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	26.00%	30.00%	30.00%
Risk-free interest rate		1.20%
Expected life weighted average | yr	5.1	5.0	5.1
Black-Scholes valuation model [member] | Bottom of range [member]
Disclosure of sharebased payment [line items]
Share price in € at grant date (post reverse stock split)	€ 37.48	€ 28.09	€ 23.84
Exercise price in € (post-reverse stock split)	€ 31.68	24.27	€ 21.61
Risk-free interest rate	1.80%		0.00%
Black-Scholes valuation model [member] | Top of range [member]
Disclosure of sharebased payment [line items]
Share price in € at grant date (post reverse stock split)	€ 48.38	33.89	€ 28.46
Exercise price in € (post-reverse stock split)	€ 39.08	€ 30.47	€ 24.95
Risk-free interest rate	2.10%		0.40%

XML

Business Combinations - Additional Information (Detail) - EUR (€) € in Millions			12 Months Ended
	Feb. 24, 2017	Jan. 01, 2017	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [line items]
Consolidated revenue		€ 490.6
Consolidated net income		42.3
Vancis BV [member]
Disclosure of detailed information about business combination [line items]
Percentage of shares acquired	100.00%
Total consideration of cash paid	€ 77.5
M&A transaction costs	€ 1.2		€ 0.5	€ 0.7
Revenue contribution		6.5
Contribution to net income		€ (0.1)

XML

Business Combinations - Summary of Purchase Price Allocation for Acquisition (Detail) - Vancis BV [member] € in Thousands	Feb. 24, 2017 EUR (€)
Disclosure of detailed information about business combination [line items]
Property, plant and equipment	€ 16,821
Trade receivables	1,165
Other current assets	959
Trade payables and other liabilities	(1,249)
Provisions	(280)
Goodwill	38,900
Customer portfolio	28,005
Deferred taxes	(6,804)
Total purchase price	€ 77,517

XML

Business Combinations - Summary of Purchase Price Allocation for Acquisition (Parenthetical) (Detail) € in Thousands	Feb. 24, 2017 EUR (€)
Vancis BV [member]
Disclosure of detailed information about business combination [line items]
Contractual gross amounts included in trade and other receivables	€ 30

XML

Financial Commitments - Summary of Future Minimum Commitments for (Non-)cancellable Operating Leases (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of future minimum commitments for non cancellable operating lease [line items]
Future minimum commitments for (non-)cancellable operating leases	€ 360,548	€ 318,125	€ 337,159
Within one year [member]
Disclosure of future minimum commitments for non cancellable operating lease [line items]
Future minimum commitments for (non-)cancellable operating leases	35,107	28,698	30,857
Between 1 and 5 years [member]
Disclosure of future minimum commitments for non cancellable operating lease [line items]
Future minimum commitments for (non-)cancellable operating leases	136,143	118,115	125,243
After 5 years [member]
Disclosure of future minimum commitments for non cancellable operating lease [line items]
Future minimum commitments for (non-)cancellable operating leases	€ 189,298	€ 171,313	€ 181,059

XML

Financial Commitments - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of other commitment [Abstract]
Gross operating lease expense	€ 29.6	€ 27.5	€ 27.0
Other commitments	€ 43.7	€ 40.6	€ 29.5

XML

Financial Commitments - Summary of Contracts With Customers for Future Committed Revenue Receivable (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of future committed revenue receivable [line items]
Future committed revenue receivable	€ 812,600	€ 784,200	€ 705,700
Within one year [member]
Disclosure of future committed revenue receivable [line items]
Future committed revenue receivable	327,500	296,600	275,400
Between 1 and 5 years [member]
Disclosure of future committed revenue receivable [line items]
Future committed revenue receivable	449,500	434,900	353,600
After 5 years [member]
Disclosure of future committed revenue receivable [line items]
Future committed revenue receivable	€ 35,600	€ 52,700	€ 76,700

XML

Financial Commitments - Summary of Non-cancellable Energy Purchase Commitments (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of commitments to purchase energy [line items]
Non-cancellable energy purchase commitments	€ 83,500	€ 60,100	€ 50,100
Within one year [member]
Disclosure of commitments to purchase energy [line items]
Non-cancellable energy purchase commitments	41,500	39,100	36,400
Between 1 and 5 years [member]
Disclosure of commitments to purchase energy [line items]
Non-cancellable energy purchase commitments	€ 42,000	€ 21,000	€ 13,700

XML

Capital Commitments - Additional Information (Detail) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Capital commitments [abstract]
Outstanding capital commitments	€ 285.9	€ 114.1	€ 66.2

XML

Contingencies - Additional Information (Detail) - EUR (€)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Guarantees [member]
Disclosure of contingent liabilities [line items]
Guarantee on third party's future payments	€ 400,000
Other guarantees	0	€ 1,000,000	€ 100,000
Bottom of range [member]
Disclosure of contingent liabilities [line items]
Possible site restoration liability	0	0	0
Top of range [member]
Disclosure of contingent liabilities [line items]
Possible site restoration liability	29,200,000	24,700,000	23,200,000
Contingent liability for decommissioning, restoration and rehabilitation costs [member] | Leasehold improvements [member]
Disclosure of contingent liabilities [line items]
Recognized provision for site restoration	300,000	0	700,000
Property, plant and equipment subject to operating leases [member] | Guarantees [member]
Disclosure of contingent liabilities [line items]
Financial guarantees in respect of leases	€ 5,100,000	€ 4,600,000	€ 6,000,000

XML

Related-party Transactions - Summary of Total Compensation of Key Management (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of transactions between related parties [line items]
Short-term employee benefits (salaries and bonuses)		€ 3,473	€ 3,341
Post-employment benefits		74	43
Share-based payments		4,974	5,267
Total		8,521	8,651
Key management [member]
Disclosure of transactions between related parties [line items]
Short-term employee benefits (salaries and bonuses)	€ 3,454	3,473	3,341
Post-employment benefits	62	74	43
Share-based payments	6,386	4,700	4,997
Total	€ 9,902	€ 8,247	€ 8,381

XML

Related-party Transactions - Summary of Compensation of Executive Director and Non-executive Directors of the Board (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of transactions between related parties [line items]
Salaries	€ 50,580	€ 44,556	€ 42,333
Remuneration of the Executive Director and the Non-executive Directors of the Board [member]
Disclosure of transactions between related parties [line items]
Salaries	890	915	874
Bonus	668	597	693
Share- based payment charges	4,358	2,204	2,266
Total	5,916	3,716	3,833
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | D.C. Ruberg [member]
Disclosure of transactions between related parties [line items]
Salaries	590	590	590
Bonus	668	597	693
Share- based payment charges	4,198	2,044	2,120
Total	5,456	3,231	3,403
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | F. Esser [member]
Disclosure of transactions between related parties [line items]
Salaries	65	65	65
Share- based payment charges	40	40	27
Total	105	105	92
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | M. Heraghty [member]
Disclosure of transactions between related parties [line items]
Salaries	70	70	68
Share- based payment charges	40	40	27
Total	110	110	95
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | J.F.H.P. Mandeville [member]
Disclosure of transactions between related parties [line items]
Salaries	90	115	40
Share- based payment charges	40	40	27
Total	130	155	67
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | R. Ruijter [member]
Disclosure of transactions between related parties [line items]
Salaries	75	75	73
Share- based payment charges	40	40	65
Total	€ 115	€ 115	138
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | J.C. Baker [member]
Disclosure of transactions between related parties [line items]
Salaries			21
Total			21
Remuneration of the Executive Director and the Non-executive Directors of the Board [member] | R.M. Manning [member]
Disclosure of transactions between related parties [line items]
Salaries			17
Total			€ 17

XML

Related-party Transactions - Summary of Compensation of Executive Director and Non-executive Directors of the Board (Parenthetical) (Detail) - Remuneration of the Executive Director and the Non-executive Directors of the Board [member] - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Salaries allowance amount		€ 40,000
Percentage of performance bonus	121.40%
J.F.H.P. Mandeville [member]
Disclosure of transactions between related parties [line items]
Awarded amount included in salary		€ 25,000

XML

Related-party Transactions - Additional Informational (Detail)	12 Months Ended
	Dec. 31, 2017 EUR (€) Percentile_rank shares	Dec. 31, 2016 EUR (€)		Dec. 31, 2015 EUR (€)
Disclosure of transactions between related parties [line items]
Performance period	3 years
Revenue	€ 489,302,000	€ 421,788,000	[1]	€ 386,560,000	[1]
Adjusted EBITDA margin	45.20%
Number of shares awarded		61,469		68,639
Executive Director [member]
Disclosure of transactions between related parties [line items]
Percentile rank of base salary | Percentile_rank	50
Risk compensation percentage of total compensation at target	79.00%	79.00%		79.00%
Risk compensation percentage of total compensation at maximum pay-out of both STI and LTI	86.00%	86.00%		86.00%
Maximum pay-out percentage of number of shares awarded at target	175.00%	175.00%		175.00%
STI: cash bonus target percentage of base salary	110.00%	100.00%
LTI: performance shares target percentage of base salary	175.00%			300.00%
STI: Cash Bonus	€ 667,585	€ 597,143		€ 693,000
STI: Cash bonus actual performance against target cash bonus percentage	110.30%	108.60%		126.00%
Executive Director [member] | Short term incentive plan [member]
Disclosure of transactions between related parties [line items]
Target cash bonus percentage of base salary	110.00%	100.00%		100.00%
Maximum pay-out opportunity percentage of target cash bonus	145.00%	145.00%		145.00%
Executive Director [member] | Long-term incentive plan [member]
Disclosure of transactions between related parties [line items]
Maximum pay-out percentage of number of shares awarded at target	175.00%	150.00%
Percentage of annual conditional performance share awards	100.00%
TSR performance period	3 years	2 years
Annual target value of conditional performance share award percentage of base salary	300.00%	300.00%		300.00%
Executive Director [member] | Bottom of range [member]
Disclosure of transactions between related parties [line items]
Percentile rank of STI and LTI | Percentile_rank	50
Executive Director [member] | Top of range [member]
Disclosure of transactions between related parties [line items]
Percentile rank of STI and LTI | Percentile_rank	75
STI: Cash Bonus	€ 877,000	€ 798,000		€ 798,000
STI: cash bonus maximum percentage at target bonus	145.00%	145.00%		145.00%
Executive Director [member] | Target [member]
Disclosure of transactions between related parties [line items]
STI: cash bonus target percentage of base salary	110.00%	100.00%		100.00%
LTI: performance shares target percentage of base salary	300.00%	300.00%		300.00%
STI: Cash Bonus	€ 605,000	€ 550,000		€ 550,000
STI: cash bonus maximum percentage at target bonus	145.00%	145.00%		145.00%
Restricted shares [member] | Non-executive directors [member]
Disclosure of transactions between related parties [line items]
Total restricted shares granted to Non-executive Directors | shares	3,984
Restricted shares granted to each Non-executive Directors | shares	996
Long-term incentive plan [member] | Third Anniversary [member]
Disclosure of transactions between related parties [line items]
Vesting percentage	50.00%
Long-term incentive plan [member] | Fourth Anniversary [member]
Disclosure of transactions between related parties [line items]
Vesting percentage	50.00%
2017 plan [member]
Disclosure of transactions between related parties [line items]
Number of shares awarded	60,060
2017 plan [member] | First Installment [member]
Disclosure of transactions between related parties [line items]
Number of other equity instruments expected to vest in share-based payment arrangement	30,030
2017 plan [member] | Second Installment [member]
Disclosure of transactions between related parties [line items]
Number of other equity instruments expected to vest in share-based payment arrangement	30,030

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

XML

Related-party Transactions - Disclosure of Performance Achievement Measures to Determine Pay-Out of Cash Bonus (Detail) - Short term incentive plan [member]	12 Months Ended
	Dec. 31, 2017
Pay-out at Threshold Performance [member]
Disclosure of transactions between related parties [line items]
Revenue	0.00%
Adjusted EBITDA Margin	0.00%
Individual Performance Objectives	0.00%
Pay-out as % of at target cash bonus	0.00%
Pay-out at Target Performance [member]
Disclosure of transactions between related parties [line items]
Revenue	40.00%
Adjusted EBITDA Margin	40.00%
Individual Performance Objectives	20.00%
Pay-out as % of at target cash bonus	100.00%
Pay-out at Maximum Performance [member]
Disclosure of transactions between related parties [line items]
Revenue	60.00%
Adjusted EBITDA Margin	60.00%
Individual Performance Objectives	25.00%
Pay-out as % of at target cash bonus	145.00%

XML

Related-party Transactions - Summary of Performance/Pay-Out (Detail)	12 Months Ended
	Dec. 31, 2017
TSR Performance of S & P Small Cap 600 Constituents 75th Percentile or greater [member]
Disclosure of transactions between related parties [line items]
Adjustment to the number of Performance Shares conditionally awarded	1.75
TSR Performance of S&P SmallCap 600 Constituents, 50th Percentile [member]
Disclosure of transactions between related parties [line items]
Adjustment to the number of Performance Shares conditionally awarded	1.00
TSR Performance of S&P SmallCap 600 Constituents, 25th Percentile [member]
Disclosure of transactions between related parties [line items]
Adjustment to the number of Performance Shares conditionally awarded	0.25
TSR Performance of S&P SmallCap 600 Constituents, Less than 25th Percentile [member]
Disclosure of transactions between related parties [line items]
Adjustment to the number of Performance Shares conditionally awarded	0.00

XML

Related-party Transactions - Summary of Potential Compensation Pay-Outs (Detail) - EUR (€)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items]
LTI: Performance Shares		€ 4,974,000	€ 5,267,000
Total		8,521,000	8,651,000
Executive Director [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
STI: Cash Bonus	€ 667,585	€ 597,143	€ 693,000
STI: Cash Bonus	110.00%	100.00%
LTI: Performance Shares	175.00%		300.00%
Target [member] | Executive Director [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Base Salary	€ 550,000	€ 550,000	€ 550,000
Car Allowance	40,000	40,000	40,000
STI: Cash Bonus	605,000	550,000	550,000
LTI: Performance Shares	1,650,000	1,650,000	1,650,000
Total	€ 2,845,000	€ 2,790,000	€ 2,790,000
STI: Cash Bonus	110.00%	100.00%	100.00%
STI: Cash Bonus	145.00%	145.00%	145.00%
LTI: Performance Shares	300.00%	300.00%	300.00%
Top of range [member] | Executive Director [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Base Salary	€ 550,000	€ 550,000	€ 550,000
Car Allowance	40,000	40,000	40,000
STI: Cash Bonus	877,000	798,000	798,000
LTI: Performance Shares	2,887,000	2,887,000	2,887,000
Total	€ 4,354,000	€ 4,275,000	€ 4,275,000
STI: Cash Bonus	145.00%	145.00%	145.00%
LTI: Performance Shares	175.00%	175.00%	175.00%

XML

Related-party Transactions - Summary of Potential Compensation Pay-Outs (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Number of shares awarded		61,469	68,639
Number of shares vested	38,286
Number of shares unvested	34,320
Percentage of unvested shares	50.00%		50.00%

XML

Related-party Transactions - Summary of Performance Targets and Achievement Against Targets (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Revenue target weighting percentage	40.00%	40.00%	40.00%
Adjusted EBITDA margin target weighting percentage	40.00%	40.00%	40.00%
Individual Performance Objectives target weighting percentage	20.00%	20.00%	20.00%
Overall performance achievement weighting percentage		100.00%	100.00%
Revenue target performance	€ 473.5	€ 424.0	€ 381.6
Revenue growth target performance percentage	12.30%	9.70%	12.00%
Adjusted EBITDA Margin target performance	45.50%	44.90%	44.00%
Revenue actual performance	€ 493.5	€ 421.8	€ 386.6
Revenue growth actual performance percentage	17.00%	9.10%	13.50%
Adjusted EBITDA margin actual performance percentage	45.00%	45.30%	44.30%
Individual performance objectives actual performance	115.00%
Revenue pay out percentage	60.00%	28.60%	60.00%
Adjusted EBITDA margin pay out percentage	27.30%	60.00%	46.00%
Individual performance objectives pay out percentage	23.00%	20.00%	20.00%
Overall performance achievement pay out percentage	110.30%	108.60%	126.00%
Revenue target weighting percentage	40.00%	40.00%	40.00%
Adjusted EBITDA margin target weighting percentage	40.00%	40.00%	40.00%
Individual Performance Objectives target weighting percentage	20.00%	20.00%	20.00%
Overall performance achievement weighting percentage		100.00%	100.00%
Revenue target performance	€ 473.5	€ 424.0	€ 381.6
Revenue growth target performance percentage	12.30%	9.70%	12.00%
Adjusted EBITDA Margin target performance	45.50%	44.90%	44.00%
Revenue actual performance	€ 493.5	€ 421.8	€ 386.6
Revenue growth actual performance percentage	17.00%	9.10%	13.50%
Adjusted EBITDA margin actual performance percentage	45.00%	45.30%	44.30%

XML

Related-party Transactions - Summary of Number of Performance Shares Conditionally Awarded (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of performance shares to be awarded based on relative TSR performance	46,808	61,469	34,320
TSR Performance of S&P SmallCap 600 Constituents, 25th Percentile [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of performance shares to be awarded based on relative TSR performance	11,702	15,367	8,580
TSR Performance of S&P SmallCap 600 Constituents, 50th Percentile [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of performance shares to be awarded based on relative TSR performance	46,808	61,469	34,320
TSR Performance of S&P SmallCap 600 Constituents, 75th [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of performance shares to be awarded based on relative TSR performance	81,914	107,571	60,060

XML

Related-party Transactions - Summary of Number of Performance Shares Conditionally Awarded (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Average closing share price | $ / shares	$ 37.42	$ 29.16	$ 27.95
Percentage of other equity instruments unvested	50.00%		50.00%
Number of instruments other equity instruments granted		61,469	68,639
Number of performance shares awarded | shares		38,286
Initial performance share award [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage	50.00%
Final performance share award [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage	50.00%

XML

Related-party Transactions - Summary of TSR Performance (Detail)	12 Months Ended
	Dec. 31, 2017
TSR Performance of S&P SmallCap 600 Constituents, 75th [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cumulative total shareholder return percentage	74.00%
TSR Performance of S&P SmallCap 600 Constituents, 50th Percentile [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cumulative total shareholder return percentage	32.00%
TSR Performance of S&P SmallCap 600 Constituents, 25th Percentile [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cumulative total shareholder return percentage	(9.00%)
INXN [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cumulative total shareholder return percentage	105.00%

XML

Events Subsequent to the Balance Sheet Date - Additional Information (Detail) - EUR (€) € in Millions				1 Months Ended
	May 01, 2018	Mar. 16, 2018	Feb. 20, 2018	Apr. 30, 2018
Two thousand and eighteen Subordinated Revolving Facility Agreement [member]
Disclosure of non-adjusting events after reporting period [line items]
Unsecured subordinated revolving facility		€ 225.0
Revolving facility agreement [member] | Two thousand and eighteen Subordinated Revolving Facility Agreement [member]
Disclosure of non-adjusting events after reporting period [line items]
Unsecured subordinated revolving credit facility extended maturity date		Dec. 31, 2019
Unsecured subordinated revolving facility interest rate		EURIBOR (subject to a zero percent floor) plus a margin of 3.00% per annum
Revolving facility agreement [member] | 2013 Super Senior Revolving Facility Agreement [member]
Disclosure of non-adjusting events after reporting period [line items]
Guarantor coverage threshold as percentage of adjusted EBITDA	80.00%		85.00%
Revolving facility agreement [member] | 2017 Senior Secured Revolving Facility [member]
Disclosure of non-adjusting events after reporting period [line items]
Senior secured revolving facility, extended waiver date				Jul. 31, 2018
Revolving facility agreement [member] | Top of range [member] | Two thousand and eighteen Subordinated Revolving Facility Agreement [member]
Disclosure of non-adjusting events after reporting period [line items]
Unsecured subordinated revolving facility interest rate		EURIBOR (subject to a zero percent floor) plus a margin of 4.50% per annum

XML

Correction of Errors - Summary of Consolidated Statement of Financial Position (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Disclosure of key management compensation as corrected [line items]
Total assets	€ 1,702,071	€ 1,482,665	[1]	€ 1,252,064	[1]	€ 1,173,103
Total liabilities	1,105,343	933,896	[1]	744,647	[1]	736,958
Share premium	539,448	523,671	[1]	509,816	[1]	495,743
Accumulated profit/(deficit)	47,360	8,293	[1]	(30,043)	[1]	(76,723)
Others		17,125		27,644		17,125
Shareholders' equity	€ 596,728	548,769	[1]	507,417	[1],[2],[3]	436,145
Previously stated [member]
Disclosure of key management compensation as corrected [line items]
Total assets		1,482,665		1,252,064		1,173,103
Total liabilities		933,896		744,647		736,958
Share premium		519,604		507,296		495,109
Accumulated profit/(deficit)		12,360		(27,523)		(76,089)
Others		16,805		27,644		17,125
Shareholders' equity		548,769		507,417		436,145
Increase (decrease) due to corrections of prior period errors [member]
Disclosure of key management compensation as corrected [line items]
Share premium		4,067		2,520		634
Accumulated profit/(deficit)		€ (4,067)		€ (2,520)		€ (634)

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] Since no minority shareholders in Group equity exist, the Group equity is entirely attributable to the parent's shareholders.

[3] The accompanying notes form an integral part of these consolidated financial statements.

XML

Correction of Errors - Summary of Consolidated Income Statement and Consolidated Statement of Comprehensive Income (Detail) - EUR (€) € / shares in Units, € in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of key management compensation as corrected [line items]
General and administrative costs		€ (167,190)	€ (138,557)	[1]	€ (134,391)	[1]
Others			181,071		181,071
Net income		39,067	38,336	[1]	46,680	[1]
Other comprehensive income/(loss), net of tax		(6,966)	(10,907)	[1]	10,459	[1]
Total comprehensive income attributable to shareholders	[2]	€ 32,101	€ 27,429	[1]	€ 57,139	[1]
Earnings per share attributable to shareholders
Basic earnings per share: (€)		€ 0.55	€ 0.54	[1]	€ 0.67	[1]
Diluted earnings per share: (€)	[2]	€ 0.55	€ 0.54	[1]	€ 0.66	[1]
Previously stated [member]
Disclosure of key management compensation as corrected [line items]
General and administrative costs			€ (137,010)		€ (132,505)
Others			181,071		181,071
Net income			39,883		48,566
Other comprehensive income/(loss), net of tax			(10,907)		10,459
Total comprehensive income attributable to shareholders			€ 28,976		€ 59,025
Earnings per share attributable to shareholders
Basic earnings per share: (€)			€ 0.57		€ 0.70
Diluted earnings per share: (€)			€ 0.56		€ 0.69
Increase (decrease) due to corrections of prior period errors [member]
Disclosure of key management compensation as corrected [line items]
General and administrative costs			€ (1,547)		€ (1,886)
Net income			(1,547)		(1,886)
Total comprehensive income attributable to shareholders			€ (1,547)		€ (1,886)
Earnings per share attributable to shareholders
Basic earnings per share: (€)			€ (0.03)		€ (0.03)
Diluted earnings per share: (€)			€ (0.02)		€ (0.03)

[1] Comparative figures for the years ended December 31, 2016 and 2015 were restated. For further information on the errors, see Notes 2 and 29 of these 2017 consolidated financial statements.

[2] The accompanying notes form an integral part of these consolidated financial statements.

XML

Correction of Errors - Summary of Key Management Compensation (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Disclosure of key management compensation as corrected [line items]
Short-term employee benefits (salaries and bonuses)	€ 3,473	€ 3,341
Post-employment benefits	74	43
Share-based payments	4,974	5,267
Total	8,521	8,651
Previously stated [member]
Disclosure of key management compensation as corrected [line items]
Short-term employee benefits (salaries and bonuses)	3,473	3,341
Post-employment benefits	74	43
Share-based payments	3,427	3,381
Total	6,974	6,765
Increase (decrease) due to corrections of prior period errors [member]
Disclosure of key management compensation as corrected [line items]
Share-based payments	1,547	1,886
Total	€ 1,547	€ 1,886