10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

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

For the Quarterly Period Ended June 30, 2023

OR
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Transition Period from                        to

Commission file number 1-13045

IRON MOUNTAIN INCORPORATED

(Exact Name of Registrant as Specified in Its Charter)

Delaware	23-2588479
(State or other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

85 New Hampshire Avenue, Suite 150, Portsmouth, New Hampshire 03801

(Address of Principal Executive Offices, Including Zip Code)

(617) 535-4766

(Registrant's Telephone Number, Including Area Code)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $.01 par value	IRM	NYSE

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 every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒    No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

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

If an emerging growth company, 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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐    No ☒

As of July 28, 2023, the registrant had 291,852,409 outstanding shares of common stock, $.01 par value.

IRON MOUNTAIN INCORPORATED

2023 FORM 10-Q QUARTERLY REPORT

TABLE OF CONTENTS

PART I—FINANCIAL INFORMATION
	1	ITEM 1.	Unaudited Condensed Consolidated Financial Statements
		2	Condensed Consolidated Balance Sheets at June 30, 2023 and December 31, 2022
		3	Condensed Consolidated Statements of Operations for the Three Months Ended June 30, 2023 and 2022
		4	Condensed Consolidated Statements of Operations for the Six Months Ended June 30, 2023 and 2022
		5	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three and Six Months Ended June 30, 2023 and 2022
		6	Condensed Consolidated Statements of Equity for the Three and Six Months Ended June 30, 2023
		7	Condensed Consolidated Statements of Equity for the Three and Six Months Ended June 30, 2022
		8	Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2023 and 2022
		9	Notes to Condensed Consolidated Financial Statements
	30	ITEM 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations
	51	ITEM 4.	Controls and Procedures
PART II—OTHER INFORMATION
	53	ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds
	53	ITEM 5.	Other Information
	53	ITEM 6.	Exhibits
	54	Signatures

PART I. FINANCIAL INFORMATION

ITEM 1. UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 1

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED BALANCE SHEETS

(IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA) (UNAUDITED)

	JUNE 30, 2023		DECEMBER 31, 2022
ASSETS
Current Assets:
Cash and cash equivalents	$	149,493	$	141,797
Accounts receivable (less allowances of $65,217 and $54,143 as of June 30, 2023 and December 31, 2022, respectively)	1,182,154		1,174,915
Prepaid expenses and other	279,522		230,433
Total Current Assets	1,611,169		1,547,145
Property, Plant and Equipment:
Property, plant and equipment	9,546,766		9,025,765
Less—Accumulated depreciation	(3,943,300)		(3,910,321)
Property, Plant and Equipment, Net	5,603,466		5,115,444
Other Assets, Net:
Goodwill	4,928,145		4,882,734
Customer and supplier relationships and other intangible assets	1,348,679		1,423,145
Operating lease right-of-use assets	2,671,371		2,583,704
Other	515,739		588,342
Total Other Assets, Net	9,463,934		9,477,925
Total Assets	$	16,678,569	$	16,140,514
LIABILITIES AND EQUITY
Current Liabilities:
Current portion of long-term debt	$	102,582	$	87,546
Accounts payable	482,244		469,198
Accrued expenses and other current liabilities (includes current portion of operating lease liabilities)	1,141,613		1,031,910
Deferred revenue	336,068		328,910
Total Current Liabilities	2,062,507		1,917,564
Long-term Debt, net of current portion	11,144,230		10,481,449
Long-term Operating Lease Liabilities, net of current portion	2,513,975		2,429,167
Other Long-term Liabilities	164,242		317,376
Deferred Income Taxes	273,213		263,005
Commitments and Contingencies
Redeemable Noncontrolling Interests	104,059		95,160
Equity:
Preferred stock (par value $0.01; authorized 10,000,000 shares; none issued and outstanding)	—		—
Common stock (par value $0.01; authorized 400,000,000 shares; issued and outstanding 291,824,958 and 290,830,296 shares as of June 30, 2023 and December 31, 2022, respectively)	2,918		2,908
Additional paid-in capital	4,488,492		4,468,035
(Distributions in excess of earnings) Earnings in excess of distributions	(3,692,948)		(3,392,272)
Accumulated other comprehensive items, net	(382,244)		(442,003)
Total Iron Mountain Incorporated Stockholders' Equity	416,218		636,668
Noncontrolling Interests	125		125
Total Equity	416,343		636,793
Total Liabilities and Equity	$	16,678,569	$	16,140,514

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 2

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(IN THOUSANDS, EXCEPT PER SHARE DATA) (UNAUDITED)

	THREE MONTHS ENDED JUNE 30,
	2023		2022
Revenues:
Storage rental	$	830,756	$	753,126
Service	527,180		536,408
Total Revenues	1,357,936		1,289,534
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	592,644		556,476
Selling, general and administrative	311,805		295,394
Depreciation and amortization	195,367		178,254
Acquisition and Integration Costs	1,511		16,878
Restructuring and other transformation	45,588		—
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(1,505)		(51,249)
Total Operating Expenses	1,145,410		995,753
Operating Income (Loss)	212,526		293,781
Interest Expense, Net (includes Interest Income of $2,290 and $2,171 for the three months ended June 30, 2023 and 2022, respectively)	144,178		115,057
Other Expense (Income), Net	62,950		(41,217)
Net Income (Loss) Before Provision (Benefit) for Income Taxes	5,398		219,941
Provision (Benefit) for Income Taxes	4,255		18,083
Net Income (Loss)	1,143		201,858
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,029		1,777
Net Income (Loss) Attributable to Iron Mountain Incorporated	$	114	$	200,081
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic	$	0.00	$	0.69
Diluted	$	0.00	$	0.68
Weighted Average Common Shares Outstanding—Basic	291,825		290,756
Weighted Average Common Shares Outstanding—Diluted	293,527		292,487

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 3

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(IN THOUSANDS, EXCEPT PER SHARE DATA) (UNAUDITED)

	SIX MONTHS ENDED JUNE 30,
	2023		2022
Revenues:
Storage rental	$	1,640,845	$	1,504,196
Service	1,031,440		1,033,384
Total Revenues	2,672,285		2,537,580
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	1,164,270		1,103,098
Selling, general and administrative	606,325		576,117
Depreciation and amortization	377,461		361,869
Acquisition and Integration Costs	3,106		32,539
Restructuring and other transformation	82,501		—
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(14,566)		(51,954)
Total Operating Expenses	2,219,097		2,021,669
Operating Income (Loss)	453,188		515,911
Interest Expense, Net (includes Interest Income of $5,197 and $3,819 for the six months ended June 30, 2023 and 2022, respectively)	281,347		229,499
Other Expense (Income), Net	84,150		14,684
Net Income (Loss) Before Provision (Benefit) for Income Taxes	87,691		271,728
Provision (Benefit) for Income Taxes	21,013		28,163
Net Income (Loss)	66,678		243,565
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,969		1,185
Net Income (Loss) Attributable to Iron Mountain Incorporated	$	64,709	$	242,380
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic	$	0.22	$	0.83
Diluted	$	0.22	$	0.83
Weighted Average Common Shares Outstanding—Basic	291,633		290,542
Weighted Average Common Shares Outstanding—Diluted	293,288		292,166

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 4

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(IN THOUSANDS) (UNAUDITED)

	THREE MONTHS ENDED JUNE 30,
	2023		2022
Net Income (Loss)	$	1,143	$	201,858
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	18,035		(187,786)
Change in Fair Value of Derivative Instruments	7,896		34,211
Reclassifications from Accumulated Other Comprehensive Items, net	(2,527)		—
Total Other Comprehensive Income (Loss):	23,404		(153,575)
Comprehensive Income (Loss)	24,547		48,283
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	909		819
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$	23,638	$	47,464

	SIX MONTHS ENDED JUNE 30,
	2023		2022
Net Income (Loss)	$	66,678	$	243,565
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	58,261		(160,333)
Change in Fair Value of Derivative Instruments	4,454		50,977
Reclassifications from Accumulated Other Comprehensive Items, net	(2,527)		—
Total Other Comprehensive Income (Loss):	60,188		(109,356)
Comprehensive Income (Loss)	126,866		134,209
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	2,398		457
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$	124,468	$	133,752

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 5

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(IN THOUSANDS, EXCEPT SHARE DATA) (UNAUDITED)

THREE MONTHS ENDED JUNE 30, 2023
			IRON MOUNTAIN INCORPORATED STOCKHOLDERS' EQUITY
			COMMON STOCK			ADDITIONAL PAID-IN CAPITAL		(DISTRIBUTIONS IN EXCESS OF EARNINGS) EARNINGS IN EXCESS OF DISTRIBUTIONS		ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET		NONCONTROLLING INTERESTS		REDEEMABLE NONCONTROLLING INTERESTS
	TOTAL		SHARES	AMOUNTS
Balance, March 31, 2023	$	545,589	291,584,999	$	2,916	$	4,459,265	$	(3,510,949)	$	(405,768)	$	125	$	95,630
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	27,862		239,959	2		27,860		—		—		—		—
Changes in equity related to redeemable noncontrolling interests	1,367		—	—		1,367		—		—		—		(1,367)
Parent cash dividends declared	(182,113)		—	—		—		(182,113)		—		—		—
Other comprehensive income (loss)	23,524		—	—		—		—		23,524		—		(120)
Net Income (Loss)	114		—	—		—		114		—		—		1,029
Noncontrolling interests equity contributions	—		—	—		—		—		—		—		9,900
Noncontrolling interests dividends	—		—	—		—		—		—		—		(1,013)
Balance, June 30, 2023	$	416,343	291,824,958	$	2,918	$	4,488,492	$	(3,692,948)	$	(382,244)	$	125	$	104,059
SIX MONTHS ENDED JUNE 30, 2023
			IRON MOUNTAIN INCORPORATED STOCKHOLDERS' EQUITY
			COMMON STOCK			ADDITIONAL PAID-IN CAPITAL		(DISTRIBUTIONS IN EXCESS OF EARNINGS) EARNINGS IN EXCESS OF DISTRIBUTIONS		ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET		NONCONTROLLING INTERESTS		REDEEMABLE NONCONTROLLING INTERESTS
	TOTAL		SHARES	AMOUNTS
Balance, December 31, 2022	$	636,793	290,830,296	$	2,908	$	4,468,035	$	(3,392,272)	$	(442,003)	$	125	$	95,160
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	19,100		994,662	10		19,090		—		—		—		—
Changes in equity related to redeemable noncontrolling interests	1,367		—	—		1,367		—		—		—		(1,367)
Parent cash dividends declared	(365,385)		—	—		—		(365,385)		—		—		—
Other comprehensive income (loss)	59,759		—	—		—		—		59,759		—		429
Net income (loss)	64,709		—	—		—		64,709		—		—		1,969
Noncontrolling interests equity contributions	—		—	—		—		—		—		—		9,900
Noncontrolling interests dividends	—		—	—		—		—		—		—		(2,032)
Balance, June 30, 2023	$	416,343	291,824,958	$	2,918	$	4,488,492	$	(3,692,948)	$	(382,244)	$	125	$	104,059

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 6

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(IN THOUSANDS, EXCEPT SHARE DATA) (UNAUDITED)

THREE MONTHS ENDED JUNE 30, 2022
			IRON MOUNTAIN INCORPORATED STOCKHOLDERS' EQUITY
			COMMON STOCK			ADDITIONAL PAID-IN CAPITAL		(DISTRIBUTIONS IN EXCESS OF EARNINGS) EARNINGS IN EXCESS OF DISTRIBUTIONS		ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET		NONCONTROLLING INTERESTS		REDEEMABLE NONCONTROLLING INTERESTS
	TOTAL		SHARES	AMOUNTS
Balance, March 31, 2022	$	758,771	290,550,440	$	2,906	$	4,409,051	$	(3,359,876)	$	(294,358)	$	1,048	$	73,428
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	24,462		129,518	1		24,461		—		—		—		—
Changes in equity related to noncontrolling interests	4,618		—	—		983		—		—		3,635		(983)
Parent cash dividends declared	(181,197)		—	—		—		(181,197)		—		—		—
Other comprehensive (loss) income	(152,708)		—	—		—		—		(152,617)		(91)		(867)
Net income (loss)	200,315		—	—		—		200,081		—		234		1,543
Noncontrolling interests equity contributions and related costs	(2,486)		—	—		(2,486)		—		—		—		21,547
Noncontrolling interests dividends	—		—	—		—		—		—		—		(711)
Balance, June 30, 2022	$	651,775	290,679,958	$	2,907	$	4,432,009	$	(3,340,992)	$	(446,975)	$	4,826	$	93,957
SIX MONTHS ENDED JUNE 30, 2022
			IRON MOUNTAIN INCORPORATED STOCKHOLDERS' EQUITY
			COMMON STOCK			ADDITIONAL PAID-IN CAPITAL		(DISTRIBUTIONS IN EXCESS OF EARNINGS) EARNINGS IN EXCESS OF DISTRIBUTIONS		ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET		NONCONTROLLING INTERESTS		REDEEMABLE NONCONTROLLING INTERESTS
	TOTAL		SHARES	AMOUNTS
Balance, December 31, 2021	$	857,068	289,757,061	$	2,898	$	4,412,553	$	(3,221,152)	$	(338,347)	$	1,116	$	72,411
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	22,960		922,897	9		22,951		—		—		—		—
Changes in equity related to noncontrolling interests	2,626		—	—		(1,009)		—		—		3,635		1,009
Parent cash dividends declared	(362,220)		—	—		—		(362,220)		—		—		—
Other comprehensive (loss) income	(108,787)		—	—		—		—		(108,628)		(159)		(569)
Net income (loss)	242,614		—	—		—		242,380		—		234		951
Noncontrolling interests equity contributions and related costs	(2,486)		—	—		(2,486)		—		—		—		21,547
Noncontrolling interests dividends	—		—	—		—		—		—		—		(1,392)
Balance, June 30, 2022	$	651,775	290,679,958	$	2,907	$	4,432,009	$	(3,340,992)	$	(446,975)	$	4,826	$	93,957

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 7

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(IN THOUSANDS) (UNAUDITED)

	SIX MONTHS ENDED JUNE 30,
	2023		2022
Cash Flows from Operating Activities:
Net income (loss)	$	66,678	$	243,565
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation	254,395		236,496
Amortization (includes amortization of deferred financing costs and discounts of $8,095 and $9,064 for the six months ended June 30, 2023 and 2022, respectively)	131,161		134,437
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	3,491		3,681
Stock-based compensation expense	34,882		31,597
Provision (benefit) for deferred income taxes	2,799		(18,491)
Loss on early extinguishment of debt	—		671
(Gain) loss on disposal/write-down of property, plant and equipment, net	(14,566)		(51,954)
Loss (gain) on divestments and deconsolidations	—		105,825
Loss (gain) associated with the Clutter transactions	38,000		(35,821)
Foreign currency transactions and other, net	69,183		(58,821)
(Increase) decrease in assets	(31,071)		(194,756)
(Decrease) increase in liabilities	(108,858)		(50,505)
Cash Flows from Operating Activities	446,094		345,924
Cash Flows from Investing Activities:
Capital expenditures	(600,758)		(330,220)
Cash paid for acquisitions, net of cash acquired	(21,465)		(718,657)
Acquisition of customer relationships	—		(148)
Customer inducements	(2,630)		(4,624)
Contract fulfillment costs	(39,989)		(33,951)
Investments in joint ventures and other investments	(15,830)		—
Proceeds from sales of property and equipment and other, net	35,390		96,497
Cash Flows from Investing Activities	(645,282)		(991,103)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(10,087,033)		(5,351,720)
Proceeds from revolving credit facility, term loan facilities and other debt	9,683,880		6,255,829
Net proceeds from sale of senior note	990,000		—
Debt financing and equity contribution from noncontrolling interests	9,900		21,547
Debt repayment and equity distribution to noncontrolling interests	(2,032)		(1,392)
Parent cash dividends	(367,060)		(364,223)
Net (payments) proceeds associated with employee stock-based awards	(15,782)		(8,636)
Other, net	(2,046)		(9,405)
Cash Flows from Financing Activities	209,827		542,000
Effect of Exchange Rates on Cash and Cash Equivalents	(2,943)		(7,903)
Increase (decrease) in Cash and Cash Equivalents	7,696		(111,082)
Cash and Cash Equivalents, Beginning of Period	141,797		255,828
Cash and Cash Equivalents, End of Period	$	149,493	$	144,746
Supplemental Information:
Cash Paid for Interest	$	270,146	$	227,633
Cash Paid for Income Taxes, Net	$	46,502	$	57,135
Non-Cash Investing and Financing Activities:
Financing Leases and Other	$	61,085	$	12,878
Accrued Capital Expenditures	$	192,197	$	98,210
Deferred Purchase Obligations and Other Deferred Payments	$	9,290	$	276,017
Dividends Payable	$	192,597	$	188,556

The accompanying notes are an integral part of these condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 8

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except share and per share data) (Unaudited)

1. GENERAL

The unaudited condensed consolidated financial statements of Iron Mountain Incorporated, a Delaware corporation ("IMI"), and its subsidiaries ("we" or "us"), have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been omitted pursuant to those rules and regulations, but we believe that the disclosures included herein are adequate to make the information presented not misleading. Certain prior year financial statement amounts have been reclassified to conform to the current year presentation. The interim condensed consolidated financial statements are presented herein and, in the opinion of management, reflect all adjustments of a normal recurring nature necessary for a fair presentation. Interim results are not necessarily indicative of results for a full year.

The Condensed Consolidated Financial Statements and Notes thereto, which are included herein, should be read in conjunction with the Consolidated Financial Statements and Notes thereto for the year ended December 31, 2022 included in our Annual Report on Form 10-K filed with the SEC on February 23, 2023 (our "Annual Report").

In September 2022, we announced a global program designed to accelerate the growth of our business ("Project Matterhorn"). See Note 11.

We have been organized and have operated as a real estate investment trust for United States federal income tax purposes ("REIT") beginning with our taxable year ended December 31, 2014.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A. CASH AND CASH EQUIVALENTS

Cash and cash equivalents include cash on hand and cash invested in highly liquid short-term securities, which have remaining maturities at the date of purchase of less than 90 days. Cash and cash equivalents are carried at cost, which approximates fair value.

B. ACCOUNTS RECEIVABLE

We maintain an allowance for doubtful accounts and a credit memo reserve for estimated losses resulting from the potential inability of our customers to make required payments and potential disputes regarding billing and service issues. The rollforward of the allowance for doubtful accounts and credit memo reserves for the six months ended June 30, 2023 is as follows:

Balance as of December 31, 2022	$	54,143
Credit memos charged to revenue	46,222
Allowance for bad debts charged to expense	16,172
Deductions and other(1)	(51,320)
Balance as of June 30, 2023	$	65,217

(1)Primarily consists of the issuance of credit memos, the write-off of accounts receivable and the impact associated with currency translation adjustments.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 9

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

C. LEASES

We lease facilities for certain warehouses, data centers and office space. We also have land leases, including those on which certain facilities are located.

Operating and financing lease right-of-use assets and lease liabilities as of June 30, 2023 and December 31, 2022 are as follows:

DESCRIPTION	JUNE 30, 2023		DECEMBER 31, 2022
Assets:
Operating lease right-of-use assets	$	2,671,371	$	2,583,704
Financing lease right-of-use assets, net of accumulated depreciation(1)	255,015		251,690
Liabilities:
Current
Operating lease liabilities	$	303,615	$	288,738
Financing lease liabilities(1)	49,148		43,857
Long-term
Operating lease liabilities	$	2,513,975	$	2,429,167
Financing lease liabilities(1)	297,190		289,048

(1)Financing lease right-of-use assets, current financing lease liabilities and long-term financing lease liabilities are included within Property, Plant and Equipment, Net, Current portion of long-term debt and Long-term Debt, net of current portion, respectively, within our Condensed Consolidated Balance Sheets.

The components of the lease expense for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DESCRIPTION	2023		2022		2023		2022
Operating lease cost(1)	$	161,241	$	139,863	$	317,114	$	283,393
Financing lease cost:
Depreciation of financing lease right-of-use assets	$	10,202	$	10,578	$	20,210	$	22,032
Interest expense for financing lease liabilities	4,416		4,359		8,757		9,037

(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $34,418 and $65,998 for the three and six months ended June 30, 2023, respectively, and $28,788 and $59,296 for the three and six months ended June 30, 2022, respectively.

Other information: Supplemental cash flow information relating to our leases for the six months ended June 30, 2023 and 2022 is as follows:

	SIX MONTHS ENDED JUNE 30,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:	2023		2022
Operating cash flows used in operating leases	$	220,764	$	200,958
Operating cash flows used in financing leases (interest)	8,757		9,037
Financing cash flows used in financing leases	22,010		20,084
NON-CASH ITEMS:
Operating lease modifications and reassessments	$	44,779	$	67,699
New operating leases (including acquisitions and sale-leaseback transactions)	163,326		382,890

In addition to the leases signed but not yet commenced that were disclosed in Note 2.j. to Notes to Consolidated Financial Statements included in our Annual Report, we entered into an operating lease in March 2023 that is expected to commence in July 2024, with an initial lease term of 25 years. The total undiscounted minimum lease payments for this lease are approximately $170,100.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 10

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

D. GOODWILL

Our reporting units as of December 31, 2022 are described in detail in Note 2.l. to Notes to Consolidated Financial Statements included in our Annual Report.

The changes in the carrying value of goodwill attributable to each reportable segment for the six months ended June 30, 2023 are as follows:

	GLOBAL RIM BUSINESS		GLOBAL DATA CENTER BUSINESS		CORPORATE AND OTHER		TOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization as of December 31, 2022	$	3,852,946	$	418,502	$	611,286	$	4,882,734
Non-tax deductible goodwill acquired during the period	22,876		—		383		23,259
Fair value and other adjustments	(80)		—		2,333		2,253
Currency translation adjustments	17,169		2,153		577		19,899
Goodwill balance, net of accumulated amortization as of June 30, 2023	$	3,892,911	$	420,655	$	614,579	$	4,928,145
Accumulated goodwill impairment balance as of June 30, 2023	$	132,409	$	—	$	26,011	$	158,420

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 11

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

E. FAIR VALUE MEASUREMENTS

The assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2023 and December 31, 2022 are as follows:

			FAIR VALUE MEASUREMENTS AT JUNE 30, 2023 USING
DESCRIPTION	TOTAL CARRYING VALUE AT JUNE 30, 2023		QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)		SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)		SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds	$	11,761	$	—	$	11,761	$	—
Time Deposits	1,127		—		1,127		—
Trading Securities	10,340		10,322		18		—
Derivative Assets	28,286		—		28,286		—
Derivative Liabilities	4,540		—		4,540		—
Deferred Purchase Obligations(1)	201,190		—		—		201,190

			FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2022 USING
DESCRIPTION	TOTAL CARRYING VALUE AT DECEMBER 31, 2022		QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)		SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)		SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds	$	11,311	$	—	$	11,311	$	—
Time Deposits	1,102		—		1,102		—
Trading Securities	9,462		9,426		36		—
Derivative Assets	51,396		—		51,396		—
Derivative Liabilities	489		—		489		—
Deferred Purchase Obligations(1)	193,033		—		—		193,033

(1)Primarily relates to the fair value of the Deferred Purchase Obligation (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) associated with the ITRenew Transaction (as defined below in Note 3), which was determined utilizing a Monte-Carlo model and takes into account our forecasted projections as it relates to the underlying performance of the business. The Monte-Carlo simulation model incorporates assumptions as to expected gross profits over the applicable achievement period, including adjustments for the volatility of timing and amount of the associated revenue and costs, as well as discount rates that account for the risk of the underlying arrangement and overall market risks. Any material change to these assumptions may result in a significantly higher or lower fair value of the Deferred Purchase Obligation. The change in value of the Deferred Purchase Obligation during the three and six months ended June 30, 2023 was driven by the accretion of the obligation to present value.

There were no material items that were measured at fair value on a non-recurring basis at June 30, 2023 and December 31, 2022 other than (i) those disclosed in Note 2.p. to Notes to Consolidated Financial Statements included in our Annual Report and (ii) assets acquired and liabilities assumed through our acquisitions that occurred during the six months ended June 30, 2023, all of which are based on Level 3 inputs.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 12

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

F. ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET

The changes in Accumulated other comprehensive items, net for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30, 2023						THREE MONTHS ENDED JUNE 30, 2022
	FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL		FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL
Beginning of Period	$	(414,832)	$	9,064	$	(405,768)	$	(313,801)	$	19,443	$	(294,358)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	18,155		—		18,155		(186,828)		—		(186,828)
Change in fair value of derivative instruments	—		7,896		7,896		—		34,211		34,211
Reclassifications from accumulated other comprehensive items, net	—		(2,527)		(2,527)		—		—		—
Total other comprehensive income (loss)	18,155		5,369		23,524		(186,828)		34,211		(152,617)
End of Period	$	(396,677)	$	14,433	$	(382,244)	$	(500,629)	$	53,654	$	(446,975)

	SIX MONTHS ENDED JUNE 30, 2023						SIX MONTHS ENDED JUNE 30, 2022
	FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL		FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL
Beginning of Period	$	(454,509)	$	12,506	$	(442,003)	$	(341,024)	$	2,677	$	(338,347)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	57,832		—		57,832		(159,605)		—		(159,605)
Change in fair value of derivative instruments	—		4,454		4,454		—		50,977		50,977
Reclassifications from accumulated other comprehensive items, net	—		(2,527)		(2,527)		—		—		—
Total other comprehensive income (loss)	57,832		1,927		59,759		(159,605)		50,977		(108,628)
End of Period	$	(396,677)	$	14,433	$	(382,244)	$	(500,629)	$	53,654	$	(446,975)

G. REVENUES

The costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to obtain or fulfill customer contracts (collectively, "Contract Fulfillment Costs"). Contract Fulfillment Costs as of June 30, 2023 and December 31, 2022 are as follows:

	JUNE 30, 2023						DECEMBER 31, 2022
	GROSS CARRYING AMOUNT		ACCUMULATED AMORTIZATION		NET CARRYING AMOUNT		GROSS CARRYING AMOUNT		ACCUMULATED AMORTIZATION		NET CARRYING AMOUNT
Intake Costs asset	$	75,428	$	(47,919)	$	27,509	$	68,345	$	(42,132)	$	26,213
Commissions asset	148,003		(66,431)		81,572		133,145		(58,949)		74,196

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 13

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows:

DESCRIPTION	LOCATION IN BALANCE SHEET	JUNE 30, 2023		DECEMBER 31, 2022
Deferred revenue - Current	Deferred revenue	$	336,068	$	328,910
Deferred revenue - Long-term	Other Long-term Liabilities	22,343		32,960

DATA CENTER LESSOR CONSIDERATIONS

Our Global Data Center Business features storage rental provided to customers at contractually specified rates over a fixed contractual period, which are accounted for in accordance with Accounting Standards Codification ("ASC") 842, Leases. Storage rental revenue, including revenue associated with power and connectivity, associated with our Global Data Center Business for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Storage rental revenue(1)	$	110,990	$	89,768	$	218,425	$	177,219

(1)Revenue associated with power and connectivity included within storage rental revenue was $38,692 and $79,364 for the three and six months ended June 30, 2023, respectively, and $30,713 and $59,031 for the three and six months ended June 30, 2022, respectively.

H. STOCK-BASED COMPENSATION

Our stock-based compensation expense includes the cost of stock options, restricted stock units ("RSUs") and performance units ("PUs") (together, the "Employee Stock-Based Awards").

STOCK-BASED COMPENSATION EXPENSE

Stock-based compensation expense for the Employee Stock-Based Awards for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Stock-based compensation expense	$	22,373	$	20,256	$	34,882	$	31,597

As of June 30, 2023, unrecognized compensation cost related to the unvested portion of our Employee Stock-Based Awards is $87,880.

I. ACQUISITION AND INTEGRATION COSTS

Acquisition and integration costs represent operating expenditures directly associated with the closing and integration activities of our business acquisitions that have closed, or are highly probable of closing, and include (i) advisory, legal and professional fees to complete business acquisitions and (ii) costs to integrate acquired businesses into our existing operations, including move, severance and system integration costs (collectively, "Acquisition and Integration Costs").

Acquisition and Integration Costs for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Acquisition and Integration Costs	$	1,511	$	16,878	$	3,106	$	32,539

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 14

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

J. (GAIN) LOSS ON DISPOSAL/WRITE-DOWN OF PROPERTY, PLANT AND EQUIPMENT, NET

(Gain) loss on disposal/write-down of property, plant and equipment, net for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022(2)		2023(1)		2022(2)
(Gain) Loss on disposal/write-down of property, plant and equipment, net(3)	$	(1,505)	$	(51,249)	$	(14,566)	$	(51,954)

(1)    The gains for the six months ended June 30, 2023 primarily consist of a gain of approximately $18,500 associated with a sale-leaseback transaction of a facility in Singapore during the first quarter of 2023.

(2)    The gains for the three and six months ended June 30, 2022 primarily consist of gains of approximately $49,000 associated with sale and sale-leaseback transactions of 11 facilities and parcels of land in the United States.

(3)    The gains recognized during both 2023 and 2022 are the result of our program to monetize a small portion of our industrial assets through sale and sale-leaseback transactions. The terms for these leases are consistent with the terms of our lease portfolio, which are disclosed in detail in Note 2.j. to Notes to Consolidated Financial Statements included in our Annual Report.

K. OTHER EXPENSE (INCOME), NET

Other expense (income), net for the three and six months ended June 30, 2023 and 2022 consists of the following:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DESCRIPTION	2023		2022		2023		2022
Foreign currency transaction losses (gains), net(1)(2)	$	15,063	$	(55,039)	$	29,487	$	(68,240)
Debt extinguishment expense	—		—		—		671
Other, net(3)(4)	47,887		13,822		54,663		82,253
Other Expense (Income), Net	$	62,950	$	(41,217)	$	84,150	$	14,684

(1)The losses for the three and six months ended June 30, 2023 primarily consist of the impact of changes in the exchange rate of the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(2)The gains for the three and six months ended June 30, 2022 primarily consist of the impact of changes in the exchange rate of the Euro and the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(3)Other, net for the six months ended June 30, 2023 consists primarily of a loss of approximately $38,000 associated with the remeasurement to fair value of our previously held equity interest in the Clutter JV (as defined and discussed in Note 4) as well as losses on our equity method investments and the change in value of the Deferred Purchase Obligation.

(4)Other, net for the six months ended June 30, 2022 consists primarily of (i) a loss of approximately $105,800 associated with the OSG Deconsolidation (as defined in Note 4 to Notes to Consolidated Financial Statements included in our Annual Report), partially offset by (ii) a gain of approximately $35,800 associated with the Clutter Transaction (as defined in Note 5 to Notes to Consolidated Financial Statements included in our Annual Report).

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 15

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

L. INCOME TAXES

We provide for income taxes during interim periods based on our estimate of the effective tax rate for the year. Our effective tax rates for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023(1)		2022(2)		2023(1)		2022(2)
Effective Tax Rate	78.8	%	8.2	%	24.0	%	10.4	%

(1)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2023 were (i) the loss of approximately $38,000 recorded in Other, net a component of Other expense (income), net during the second quarter of 2023 to reflect the remeasurement of our previously held equity interest in the Clutter JV to fair value, for which there was no tax impact, (ii) the benefits derived from the dividends paid deduction and (iii) the differences in the tax rates to which our foreign earnings are subject.

(2)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2022 were the benefits derived from the dividends paid deduction and the differences in the tax rates to which our foreign earnings are subject. In addition, there were gains and losses recorded in Other expense (income), net and Gain (loss) on disposal/write-down of property, plant and equipment net, during the period for which there was an insignificant tax impact. During the first quarter of 2022, there was also a release of valuation allowances on deferred tax assets of our U.S. taxable REIT subsidiaries of approximately $9,900 as a result of our acquisition of Intercept Parent, Inc. ("ITRenew").

M. INCOME (LOSS) PER SHARE—BASIC AND DILUTED

The calculations of basic and diluted income (loss) per share for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,029		1,777		1,969		1,185
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)	$	114	$	200,081	$	64,709	$	242,380
Weighted-average shares—basic	291,825,000		290,756,000		291,633,000		290,542,000
Effect of dilutive potential stock options	1,322,000		1,249,262		1,269,000		1,122,444
Effect of dilutive potential RSUs and PUs	380,000		481,972		386,000		501,975
Weighted-average shares—diluted	293,527,000		292,487,234		293,288,000		292,166,419
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic	$	0.00	$	0.69	$	0.22	$	0.83
Diluted	$	0.00	$	0.68	$	0.22	$	0.83
Antidilutive stock options, RSUs and PUs excluded from the calculation	157,132		234,085		151,431		494,833

N. RECENT ACCOUNTING PRONOUNCEMENTS

In December 2021, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers ("ASU 2021-08"). ASU 2021-08 requires that an entity recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with ASC 606, Revenue from Contracts with Customers, and for the related revenue contracts in accordance with ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), as if it had originated the contracts. We adopted ASU 2021-08 on January 1, 2023 on a prospective basis, and there was no material impact on our condensed consolidated financial statements.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 16

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

3. ACQUISITIONS

CLUTTER

On June 29, 2023, in order to further expand our on-demand consumer storage business, we acquired 100% of the outstanding shares of Clutter Intermediate, Inc. and control of all assets of the Clutter JV (collectively, "Clutter") for total consideration of $59,100 (the “Clutter Acquisition”). During the third quarter of 2023, we anticipate offering up to 15% equity interest in Clutter to certain former stakeholders of the Clutter JV.

PRELIMINARY PURCHASE PRICE ALLOCATION

A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for all of our acquisitions closed during the six months ended June 30, 2023 is as follows:

	SIX MONTHS ENDED JUNE 30, 2023
Cash Paid (gross of cash acquired)(1)	$	21,215
Deferred Purchase Obligation, Purchase Price Holdbacks and Other	9,290
Fair Value of Previously Held Equity Interest	9,000
Settlement of Pre-Existing Relationships	20,122
Total Consideration	59,627
Fair Value of Identifiable Assets Acquired	56,248
Fair Value of Identifiable Liabilities Assumed	(19,880)
Total Fair Value of Identifiable Net Assets Acquired	36,368
Goodwill Initially Recorded(2)	$	23,259

(1)Cash paid for acquisitions, net in our Condensed Consolidated Statement of Cash Flows includes (i) cash acquired of $1,980 relating to acquisitions completed during the six months ended June 30, 2023 and (ii) contingent and other payments of $2,230 for the six months ended June 30, 2023 relating to acquisitions completed prior to January 1, 2023.

(2)Goodwill is primarily attributable to the assembled workforce, expanded market opportunities and costs and other operating synergies anticipated upon the integration of the operations of us and the acquired businesses.

The preliminary purchase price allocations that are not finalized as of June 30, 2023 relate to the final assessment of the fair values of property, plant and equipment and intangible assets (primarily the customer relationship intangible asset) associated with the acquisitions we closed during the six months ended June 30, 2023. Any adjustments to our estimates of purchase price allocations will be made in the periods in which the adjustments are determined, but no later than the one year measurement period, and the cumulative effect of such adjustments will be calculated as if the adjustments had been completed as of the applicable acquisition date. Adjustments recorded during the six months ended June 30, 2023 were not material to our results from operations.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 17

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

3. ACQUISITIONS (CONTINUED)

ITRENEW PRO FORMA FINANCIAL INFORMATION

On January 25, 2022, in order to expand our asset lifecycle management operations, we acquired an approximately 80% interest in ITRenew at an agreed upon purchase price of $725,000, subject to certain working capital adjustments at, and subsequent to, the closing (the "ITRenew Transaction"). The unaudited consolidated pro forma financial information (the "Pro Forma Financial Information") below summarizes the combined results of Iron Mountain and ITRenew on a pro forma basis as if the ITRenew Transaction had occurred on January 1, 2021. The Pro Forma Financial Information is presented for informational purposes and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place on January 1, 2021. The Pro Forma Financial Information, for the periods presented, includes purchase accounting adjustments (including amortization of acquired customer and supplier intangible assets and depreciation of acquired property, plant and equipment) and related tax effects. We and ITRenew collectively incurred $59,370 of operating expenditures to complete the ITRenew Transaction (including advisory and professional fees). These operating expenditures have been reflected within the results of operations in the Pro Forma Financial Information as if they were incurred on January 1, 2021.

	THREE MONTHS ENDED JUNE 30, 2022		SIX MONTHS ENDED JUNE 30, 2022
Total Revenues	$	1,289,534	$	2,555,554
Income from Continuing Operations	$	201,858	$	243,696

In addition to our acquisition of ITRenew, we completed certain other acquisitions in 2023 and 2022. The Pro Forma Financial Information does not reflect these acquisitions due to the insignificant impact of these acquisitions on our consolidated results of operations.

4. INVESTMENTS

CLUTTER JOINT VENTURE

In February 2022, the joint venture formed by MakeSpace Labs, Inc. and us (the "MakeSpace JV") entered into an agreement with Clutter, Inc. pursuant to which the equityholders of the MakeSpace JV contributed their ownership interests in the MakeSpace JV, and Clutter, Inc.’s shareholders contributed their ownership interests in Clutter, Inc., to create a newly formed venture (the "Clutter JV"). In exchange for our 49.99% interest in the MakeSpace JV, we received an approximate 27% interest in the Clutter JV (the "Clutter Transaction"). As a result of the Clutter Transaction, we recognized a gain related to our contributed interest in the MakeSpace JV of approximately $35,800, which was recorded to Other, net, a component of Other expense (income), net, during the first quarter of 2022.

On June 29, 2023, we completed the Clutter Acquisition. In connection with the Clutter Acquisition, our previously held approximately 27% interest in the Clutter JV was remeasured to fair value at the closing date of the Clutter Acquisition. As a result, we recognized a loss of approximately $38,000 to Other, net, a component of Other expense (income), net, during the second quarter of 2023.

WEB WERKS JOINT VENTURE

In April 2021, we closed on an agreement to form a joint venture (the "Web Werks JV") with the shareholders of Web Werks India Private Limited, a colocation data center provider in India. Through December 31, 2022, we made two investments totaling approximately 7,500,000 Indian rupees (or approximately $96,200, based upon the exchange rates between the United States dollar and Indian rupee on the closing date of each investment) in exchange for a noncontrolling interest in the form of convertible preference shares in the Web Werks JV. On July 7, 2023, we made our final contractual investment in the Web Werks JV of approximately 3,750,000 Indian rupees (or approximately $45,300, based upon the exchange rate between the United States dollar and Indian rupee on the closing date of this investment). After the final contractual payment, our interest in the Web Werks JV increased to 63.39% and we assumed control of its board of directors. For financial reporting periods beginning after July 7, 2023, the Web Werks JV will be consolidated within our Global Data Center Business segment.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 18

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

4. INVESTMENTS (CONTINUED)

JOINT VENTURE SUMMARY

The following joint ventures are accounted for as equity method investments and are presented as a component of Other within Other assets, net in our Condensed Consolidated Balance Sheets. The carrying values and equity interests in our joint ventures at June 30, 2023 and December 31, 2022 are as follows:

	JUNE 30, 2023				DECEMBER 31, 2022
	CARRYING VALUE		EQUITY INTEREST		CARRYING VALUE		EQUITY INTEREST
Web Werks JV	$	98,650	53.58	%	$	98,278	53.58	%
Joint venture with AGC Equity Partners (the "Frankfurt JV")	59,394		20.00	%	37,194		20.00	%
Clutter JV	—		—	%	54,172		26.73	%

5. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Derivative instruments we are party to include: (i) interest rate swap agreements (which are designated as cash flow hedges) and (ii) cross-currency swap agreements (which are designated as net investment hedges).

INTEREST RATE SWAP AGREEMENTS DESIGNATED AS CASH FLOW HEDGES

In July 2019, we entered into forward-starting interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. These forward-starting interest rate swap agreements commenced in March 2022 with a total notional amount of $350,000 and provided variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month London Interbank Offered Rate ("LIBOR"), in exchange for the payment of fixed interest rates as specified in the respective interest rate swap agreements. In April 2023, we terminated these agreements in anticipation of the discontinuance of the LIBOR reference rate on June 30, 2023. The terminated swap agreements had associated unrealized gains at the termination date of approximately $10,100. These gains are included in Accumulated other comprehensive items, net and will be reclassified into earnings as reductions to interest expense from the date of termination through March 2024, the original maturity date of the swaps.

In April 2023, we entered into interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. Under these interest rate swap agreements, we receive variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month Secured Overnight Financing Rate, in exchange for the payment of fixed interest rates as specified in the interest rate swap agreements. As of June 30, 2023, we have $350,000 in notional value outstanding associated with these interest rate swap agreements, which expire in February 2026.

In November 2022, we entered into a forward-starting interest rate swap agreement to limit our exposure to changes in interest rates on future borrowings under our Virginia Credit Agreement (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report). This forward-starting interest rate swap agreement commenced in July 2023 and expires in October 2025. As of both June 30, 2023 and December 31, 2022, we have $4,800 in notional value outstanding on this forward-starting interest rate swap agreement.

We have designated each of the interest rate swap agreements described above as cash flow hedges. These interest rate swap agreements are marked to market at the end of each reporting period, representing the fair values of the interest rate swap agreements, and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets, while unrealized losses are recognized as liabilities.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 19

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

5. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (CONTINUED)

CROSS-CURRENCY SWAP AGREEMENTS DESIGNATED AS A HEDGE OF NET INVESTMENT

We utilize cross-currency interest rate swaps to hedge the variability of exchange rate impacts between the United States dollar and the Euro. As of both June 30, 2023 and December 31, 2022, we have approximately $469,200 in notional value outstanding on cross-currency interest rate swaps, with maturity dates ranging from August 2023 through February 2026.

We have designated these cross-currency swap agreements as hedges of net investments in certain of our Euro denominated subsidiaries and they require an exchange of the notional amounts at maturity. These cross-currency swap agreements are marked to market at the end of each reporting period, representing the fair values of the cross-currency swap agreements, and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets while unrealized losses are recognized as liabilities. The excluded component of our cross-currency swap agreements is recorded in Accumulated other comprehensive items, net and amortized to interest expense on a straight-line basis.

The fair value of derivative instruments recognized in our Condensed Consolidated Balance Sheets at June 30, 2023 and December 31, 2022, by derivative instrument, are as follows:

	JUNE 30, 2023				DECEMBER 31, 2022
DERIVATIVE INSTRUMENTS(1)	Assets		Liabilities		Assets		Liabilities
Cash Flow Hedges(2)
Interest rate swap agreements	$	6,852	$	—	$	12,995	$	489
Net Investment Hedges(3)
Cross-currency swap agreements	21,434		4,540		38,401		—

(1)Our derivative assets are included as a component of (i) Prepaid expenses and other or (ii) Other within Other assets, net and our derivative liabilities are included as a component of (i) Accrued expenses and other current liabilities or (ii) Other long-term liabilities in our Condensed Consolidated Balance Sheets. As of June 30, 2023, $1,459 is included within Prepaid expenses and other, $26,827 is included within Other assets and $4,540 is included within Accrued expense and other current liabilities. As of December 31, 2022, $2,606 is included within Prepaid expenses and other, $48,790 is included within Other assets and $489 is included within Other long-term liabilities.

(2)As of June 30, 2023, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our interest rate swap agreements are $14,433, which include $7,581 related to our terminated interest rate swap agreements.

(3)As of June 30, 2023, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our cross-currency swap agreements are $37,645, which include $20,751 related to the excluded component of our cross-currency swap agreements.

Unrealized gains (losses) recognized in Accumulated other comprehensive income during the three and six months ended June 30, 2023 and 2022, by derivative instrument, are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DERIVATIVE INSTRUMENTS	2023		2022		2023		2022
Cash Flow Hedges
Interest rate swap agreements	$	7,896	$	3,932	$	4,454	$	15,402
Net Investment Hedges
Cross-currency swap agreements	(12,704)		30,279		(21,507)		35,575
Cross-currency swap agreements (excluded component)	5,817		—		11,651		—

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 20

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

5. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (CONTINUED)

Gains (losses) recognized in Net income during the three and six months ended June 30, 2023 and 2022, by derivative instrument, are as follows:

		THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DERIVATIVE INSTRUMENTS	Location of gain (loss)	2023		2022		2023		2022
Cash Flow Hedges
Interest rate swap agreements	Interest expense	$	2,527	$	—	$	2,527	$	—
Net Investment Hedges
Cross-currency swap agreements (excluded component)	Interest expense	(5,817)		—		(11,651)		—

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 21

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

6. DEBT

Long-term debt is as follows:

	JUNE 30, 2023								DECEMBER 31, 2022
	DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT		FAIR VALUE		DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT		FAIR VALUE
Revolving Credit Facility(1)	$	679,500	$	(5,332)	$	674,168	$	679,500	$	1,072,200	$	(6,790)	$	1,065,410	$	1,072,200
Term Loan A(1)	234,375		—		234,375		234,375		240,625		—		240,625		240,625
Term Loan B(1)	662,685		(3,122)		659,563		663,250		666,073		(3,747)		662,326		666,750
Australian Dollar Term Loan	196,333		(543)		195,790		198,005		202,641		(633)		202,008		204,623
UK Bilateral Revolving Credit Facility	177,277		—		177,277		177,277		169,361		—		169,361		169,361
37/8% GBP Senior Notes due 2025 (the "GBP Notes")	506,506		(2,231)		504,275		472,474		483,888		(2,589)		481,299		445,206
47/8% Senior Notes due 2027 (the "47/8% Notes due 2027")(2)	1,000,000		(6,043)		993,957		932,500		1,000,000		(6,754)		993,246		917,500
51/4% Senior Notes due 2028 (the "51/4% Notes due 2028")(2)	825,000		(5,609)		819,391		770,344		825,000		(6,200)		818,800		754,875
5% Senior Notes due 2028 (the "5% Notes due 2028")(2)	500,000		(3,678)		496,322		461,250		500,000		(4,039)		495,961		450,000
7% Senior Notes due 2029 (the "7% Notes due 2029")(2)	1,000,000		(11,853)		988,147		992,500		—		—		—		—
47/8% Senior Notes due 2029 (the "47/8% Notes due 2029")(2)	1,000,000		(9,041)		990,959		892,500		1,000,000		(9,764)		990,236		865,000
51/4% Senior Notes due 2030 (the "51/4% Notes due 2030")(2)	1,300,000		(10,655)		1,289,345		1,166,750		1,300,000		(11,407)		1,288,593		1,111,500
41/2% Senior Notes due 2031 (the "41/2% Notes")(2)	1,100,000		(9,539)		1,090,461		940,500		1,100,000		(10,161)		1,089,839		891,000
5% Senior Notes due 2032 (the "5% Notes due 2032")	750,000		(11,858)		738,142		645,000		750,000		(12,511)		737,489		622,500
55/8% Senior Notes due 2032 (the "55/8% Notes")(2)	600,000		(5,275)		594,725		535,500		600,000		(5,566)		594,434		520,500
Real Estate Mortgages, Financing Lease Liabilities and Other	457,724		(483)		457,241		457,724		425,777		(578)		425,199		425,777
Accounts Receivable Securitization Program	343,100		(426)		342,674		343,100		314,700		(531)		314,169		314,700
Total Long-term Debt	11,332,500		(85,688)		11,246,812				10,650,265		(81,270)		10,568,995
Less Current Portion	(102,582)		—		(102,582)				(87,546)		—		(87,546)
Long-term Debt, Net of Current Portion	$	11,229,918	$	(85,688)	$	11,144,230			$	10,562,719	$	(81,270)	$	10,481,449

(1)Collectively, the “Credit Agreement”. The Credit Agreement consists of a revolving credit facility (the “Revolving Credit Facility”), a term loan A (the “Term Loan A”) and a term loan B (the "Term Loan B"). The Revolving Credit Facility and the Term Loan A are scheduled to mature on March 18, 2027. The Term Loan B is scheduled to mature on January 2, 2026. The remaining amount available for borrowing under the Revolving Credit Facility as of June 30, 2023 was $1,566,061 (which amount represents the maximum availability as of such date). The weighted average interest rate in effect under the Revolving Credit Facility was 7.0% and 6.2% as of June 30, 2023 and December 31, 2022, respectively.

(2)Collectively, the "Parent Notes". IMI is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI’s United States subsidiaries that represent the substantial majority of our United States operations (the "Note Guarantors"). These guarantees are joint and several obligations of the Note Guarantors. The remainder of our subsidiaries do not guarantee the Parent Notes.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 22

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

6. DEBT (CONTINUED)

See Note 7 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding our long-term debt, including the direct obligors of each of our debt instruments as well as information regarding the fair value of our debt instruments (including the levels of the fair value hierarchy used to determine the fair value of our debt instruments). The levels of the fair value hierarchy used to determine the fair value of our debt as of June 30, 2023 are consistent with the levels of the fair value hierarchy used to determine the fair value of our debt as of December 31, 2022 (which are disclosed in our Annual Report).

MAY 2023 OFFERING

On May 15, 2023, IMI completed a private offering of:

SERIES OF NOTES	AGGREGATE PRINCIPAL AMOUNT		MATURITY DATE	INTEREST PAYMENT DUE	PAR CALL DATE(1)
7% Notes due 2029	$	1,000,000	February 15, 2029	February 15 and August 15	August 15, 2025

(1)We may redeem the 7% Notes due 2029 at any time, at our option, in whole or in part. Prior to the par call date, we may redeem the 7% Notes due 2029 at the redemption price or make-whole premium specified in the indenture governing the 7% Notes due 2029, together with accrued and unpaid interest to, but excluding, the redemption date. On or after the par call date, we may redeem the 7% Notes due 2029 at a price equal to 100% of the principal amount being redeemed, together with accrued and unpaid interest to, but excluding, the redemption date.

The 7% Notes due 2029 were issued at 100% of par. The total net proceeds of approximately $990,000 from the issuance of the 7% Notes due 2029, after deducting the initial purchasers' commissions, were used to repay a portion of the outstanding borrowings under our Revolving Credit Facility.

ACCOUNTS RECEIVABLE SECURITIZATION PROGRAM On June 8, 2023, we amended the Accounts Receivable Securitization Program (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report) to increase the maximum borrowing capacity from $325,000 to $360,000. All other material terms of the Accounts Receivable Securitization Program remain the same as what was disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. MAXIMUM AMOUNT $360,000
OUTSTANDING BORROWING $343,100
INTEREST RATE 6.2% As of June 30, 2023

LETTERS OF CREDIT

As of June 30, 2023, we had outstanding letters of credit totaling $40,410, of which $4,439 reduce our borrowing capacity under the Revolving Credit Facility. The letters of credit expire at various dates between September 2023 and July 2025.

DEBT COVENANTS

The Credit Agreement, our bond indentures and other agreements governing our indebtedness contain certain restrictive financial and operating covenants, including covenants that restrict our ability to complete acquisitions, pay cash dividends, incur indebtedness, make investments, sell assets and take other specified corporate actions. The covenants do not contain a rating trigger. Therefore, a change in our debt rating would not trigger a default under the Credit Agreement, our bond indentures or other agreements governing our indebtedness. The Credit Agreement requires that we satisfy a net total lease adjusted leverage ratio and a fixed charge coverage ratio on a quarterly basis and our bond indentures require that, among other things, we satisfy a leverage ratio (not lease adjusted) or a fixed charge coverage ratio (not lease adjusted) as a condition to taking actions such as paying dividends and incurring indebtedness.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 23

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

6. DEBT (CONTINUED)

The Credit Agreement uses earnings before interest, taxes, depreciation and amortization and rent expense ("EBITDAR") based calculations and the bond indentures use earnings before interest, taxes, depreciation and amortization ("EBITDA") based calculations as the primary measures of financial performance for purposes of calculating leverage and fixed charge coverage ratios. The EBITDAR- and EBITDA-based leverage calculations include our consolidated subsidiaries, other than those we have designated as "Unrestricted Subsidiaries" as defined in the Credit Agreement and bond indentures. Generally, the Credit Agreement and the bond indentures use a trailing four fiscal quarter basis for purposes of the relevant calculations and require certain adjustments and exclusions for purposes of those calculations, which make the calculation of financial performance for purposes of those calculations under the Credit Agreement and bond indentures not directly comparable to Adjusted EBITDA as presented herein. We are in compliance with our leverage and fixed charge coverage ratios under the Credit Agreement, our bond indentures and other agreements governing our indebtedness as of June 30, 2023. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity.

7. COMMITMENTS AND CONTINGENCIES

We are involved in litigation from time to time in the ordinary course of business, including litigation arising from damage to customer assets in our facilities caused by fires and other natural disasters. While the outcome of litigation is inherently uncertain, we do not believe any current litigation will have a material adverse effect on our consolidated financial condition, results of operations or cash flows.

We have estimated a reasonably possible range for all loss contingencies and believe it is reasonably possible that we could incur aggregate losses in addition to amounts currently accrued for all matters up to an additional $18,000 over the next several years, of which certain amounts would be covered by insurance or indemnity arrangement.

8. STOCKHOLDERS' EQUITY MATTERS

In fiscal year 2022 and the six months ended June 30, 2023, our board of directors declared the following dividends:

DECLARATION DATE	DIVIDEND PER SHARE		RECORD DATE	TOTAL AMOUNT		PAYMENT DATE
February 24, 2022	$	0.6185	March 15, 2022	$	179,661	April 6, 2022
April 28, 2022	0.6185		June 15, 2022	179,781		July 6, 2022
August 4, 2022	0.6185		September 15, 2022	179,790		October 4, 2022
November 3, 2022	0.6185		December 15, 2022	179,866		January 5, 2023
February 23, 2023	0.6185		March 15, 2023	180,339		April 5, 2023
May 4, 2023	0.6185		June 15, 2023	180,493		July 6, 2023

On August 3, 2023, we declared a dividend to our stockholders of record as of September 15, 2023 of $0.65 per share, payable on October 5, 2023.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 24

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

9. SEGMENT INFORMATION

Our reportable segments as of December 31, 2022 are described in Note 11 to Notes to Consolidated Financial Statements included in our Annual Report and are as follows:

•Global RIM Business

•Global Data Center Business

•Corporate and Other

An analysis of our business segment information and reconciliation to the accompanying Condensed Consolidated Financial Statements for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Global RIM Business
Total Revenues	$	1,159,867	$	1,070,476	$	2,286,393	$	2,119,367
Adjusted EBITDA	499,062		469,368		976,846		918,163
Global Data Center Business
Total Revenues	$	118,033	$	100,088	$	230,338	$	197,075
Adjusted EBITDA	53,809		42,307		104,444		84,284
Corporate and Other
Total Revenues	$	80,036	$	118,970	$	155,554	$	221,138
Adjusted EBITDA	(77,213)		(56,969)		(144,824)		(116,747)
Total Consolidated
Total Revenues	$	1,357,936	$	1,289,534	$	2,672,285	$	2,537,580
Adjusted EBITDA	475,658		454,706		936,466		885,700

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 25

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

9. SEGMENT INFORMATION (CONTINUED)

Adjusted EBITDA for each segment is defined as net income (loss) before interest expense, net, provision (benefit) for income taxes, depreciation and amortization (inclusive of our share of Adjusted EBITDA from our unconsolidated joint ventures), and excluding certain items we do not believe to be indicative of our core operating results, specifically:

EXCLUDED
•Acquisition and Integration Costs •Restructuring and other transformation •(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	•Other expense (income), net •Stock-based compensation expense

Internally, we use Adjusted EBITDA as the basis for evaluating the performance of, and allocating resources to, our operating segments.

A reconciliation of Net Income (Loss) to Adjusted EBITDA on a consolidated basis for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Add/(Deduct):
Interest expense, net	144,178		115,057		281,347		229,499
Provision (benefit) for income taxes	4,255		18,083		21,013		28,163
Depreciation and amortization	195,367		178,254		377,461		361,869
Acquisition and Integration Costs	1,511		16,878		3,106		32,539
Restructuring and other transformation	45,588		—		82,501		—
(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	(1,505)		(51,249)		(14,566)		(51,954)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	58,694		(46,103)		76,185		7,412
Stock-based compensation expense	22,373		20,256		34,882		31,597
Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures	4,054		1,672		7,859		3,010
Adjusted EBITDA	$	475,658	$	454,706	$	936,466	$	885,700

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 26

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

9. SEGMENT INFORMATION (CONTINUED)

Information as to our revenues by product and service lines by segment for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Global RIM Business
Records Management(1)	$	898,634	$	818,993	$	1,766,622	$	1,621,546
Data Management(1)	130,251		124,394		259,845		258,050
Information Destruction(1)(2)	130,982		127,089		259,926		239,771
Data Center(1)	—		—		—		—
Global Data Center Business
Records Management(1)	$	—	$	—	$	—	$	—
Data Management(1)	—		—		—		—
Information Destruction(1)	—		—		—		—
Data Center(1)	118,033		100,088		230,338		197,075
Corporate and Other
Records Management(1)	$	37,409	$	36,141	$	71,757	$	68,039
Data Management(1)	—		—		—		—
Information Destruction(1)(3)	42,627		82,829		83,797		153,099
Data Center(1)	—		—		—		—
Total Consolidated
Records Management(1)	$	936,043	$	855,134	$	1,838,379	$	1,689,585
Data Management(1)	130,251		124,394		259,845		258,050
Information Destruction(1)(2)(3)	173,609		209,918		343,723		392,870
Data Center(1)	118,033		100,088		230,338		197,075

(1)Each of these offerings has a component of revenue that is storage rental related and a component that is service revenue, except for information destruction, which does not have a storage rental component.

(2)Includes secure shredding services.

(3)Includes product revenue from ITRenew.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 27

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

10. RELATED PARTIES

In October 2020, in connection with the formation of the Frankfurt JV, we entered into agreements whereby we earn various fees, including (i) special project revenue and (ii) property management and construction and development fees for services we are providing to the Frankfurt JV (the "Frankfurt JV Agreements").

In March 2019, in connection with the formation of the MakeSpace JV, we entered into a storage and service agreement with the MakeSpace JV to provide certain storage and related services to the MakeSpace JV (the "MakeSpace Agreement"). In February 2022, in connection with the formation of the Clutter JV, we terminated the MakeSpace Agreement and entered into a storage and service agreement with the Clutter JV to provide certain storage and related services to the Clutter JV (the "Clutter Agreement"). On June 29, 2023, we completed the Clutter Acquisition and terminated the Clutter Agreement.

Revenue recognized in the accompanying Condensed Consolidated Statements of Operations under these agreements for the three and six months ended June 30, 2023 and 2022 is as follows (approximately):

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Frankfurt JV Agreements(1)	$	800	$	5,700	$	1,700	$	12,800
MakeSpace Agreement and Clutter Agreement(2)	7,000		7,400		13,000		14,400

(1)Revenue associated with the Frankfurt JV Agreements is presented as a component of our Global Data Center Business segment.

(2)Revenue associated with the MakeSpace Agreement and the Clutter Agreement is presented as a component of our Global RIM Business segment.

11. RESTRUCTURING AND OTHER TRANSFORMATION

PROJECT MATTERHORN

In September 2022, we announced Project Matterhorn, a global program designed to accelerate the growth of our business. Project Matterhorn investments will focus on transforming our operating model to a global operating model. Project Matterhorn will focus on the formation of a solution-based sales approach that is designed to allow us to optimize our shared services and best practices to better serve our customers' needs. We will be investing to accelerate growth and to capture a greater share of the large, global addressable markets in which we operate. We expect to incur approximately $150,000 in costs annually related to Project Matterhorn from 2023 through 2025. Costs are comprised of (1) restructuring costs, which include (i) site consolidation and other related exit costs, (ii) employee severance costs and (iii) certain professional fees associated with these activities, and (2) other transformation costs, which include professional fees such as project management costs and costs for third party consultants who are assisting in the enablement of our growth initiatives. Total costs related to Project Matterhorn during the three and six months ended June 30, 2023 were $45,588 and $82,501, respectively, and are included in Restructuring and other transformation in our Condensed Consolidated Statement of Operations. There were no Restructuring and other transformation costs related to Project Matterhorn for the three and six months ended June 30, 2022.

Restructuring and other transformation related to Project Matterhorn included in the accompanying Condensed Consolidated Statement of Operations for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Restructuring	$	16,127	$	28,084	$	41,376
Other transformation	29,461		54,417		83,058
Restructuring and other transformation	$	45,588	$	82,501	$	124,434

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 28

Part I. Financial Information

IRON MOUNTAIN INCORPORATED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(In thousands, except share and per share data) (Unaudited)

11. RESTRUCTURING AND OTHER TRANSFORMATION (CONTINUED)

Restructuring costs for Project Matterhorn, included as a component of Restructuring and other transformation in the accompanying Condensed Consolidated Statement of Operations, by segment for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Global RIM Business	$	15,000	$	24,525	$	37,608
Global Data Center Business	—		78		78
Corporate and Other	1,127		3,481		3,690
Total restructuring costs	$	16,127	$	28,084	$	41,376

Other transformation costs for Project Matterhorn, included as a component of Restructuring and other transformation in the accompanying Condensed Consolidated Statement of Operations, by segment for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Global RIM Business	$	4,958	$	8,443	$	12,344
Global Data Center Business	498		1,368		1,426
Corporate and Other	24,005		44,606		69,288
Total other transformation costs	$	29,461	$	54,417	$	83,058

Accrued restructuring costs and accrued other transformation costs included in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2023 were approximately $7,400 and $22,200, respectively.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 29

Part I. Financial Information

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations for the three and six months ended June 30, 2023 should be read in conjunction with our Condensed Consolidated Financial Statements and Notes thereto for the three and six months ended June 30, 2023, included herein, and our Consolidated Financial Statements and Notes thereto for the year ended December 31, 2022, included in our Annual Report on Form 10-K filed with the United States Securities and Exchange Commission ("SEC") on February 23, 2023 (our "Annual Report").

FORWARD-LOOKING STATEMENTS

We have made statements in this Quarterly Report that constitute "forward-looking statements" as that term is defined in the Private Securities Litigation Reform Act of 1995 and other securities laws. These forward-looking statements concern our current expectations regarding our future results from operations, economic performance, financial condition, goals, strategies, investment objectives, plans and achievements. These forward-looking statements are subject to various known and unknown risks, uncertainties and other factors, and you should not rely upon them except as statements of our present intentions and of our present expectations, which may or may not occur. When we use words such as "believes", "expects", "anticipates", "estimates", "plans", "intends", "pursue", "will" or similar expressions, we are making forward-looking statements. Although we believe that our forward-looking statements are based on reasonable assumptions, our expected results may not be achieved, and actual results may differ materially from our expectations. In addition, important factors that could cause actual results to differ from expectations include, among others:

•our ability or inability to execute our strategic growth plan, including our ability to invest according to plan, grow our businesses (including through joint ventures), incorporate alternative technologies into our offerings, achieve satisfactory returns on new product offerings, continue our revenue management, expand and manage our global operations, complete acquisitions on satisfactory terms, integrate acquired companies efficiently and transition to more sustainable sources of energy;

•changes in customer preferences and demand for our storage and information management services, including as a result of the shift from paper and tape storage to alternative technologies that require less physical space;

•the impact of our distribution requirements on our ability to execute our business plan;

•the costs of complying with and our ability to comply with laws, regulations and customer requirements, including those relating to data privacy and cybersecurity issues, as well as fire and safety and environmental standards;

•the impact of attacks on our internal information technology ("IT") systems, including the impact of such incidents on our reputation and ability to compete and any litigation or disputes that may arise in connection with such incidents;

•our ability to fund capital expenditures;

•our ability to remain qualified for taxation as a real estate investment trust for United States federal income tax purposes ("REIT");

•changes in the political and economic environments in the countries in which we operate and changes in the global political climate;

•our ability to raise debt or equity capital and changes in the cost of our debt;

•our ability to comply with our existing debt obligations and restrictions in our debt instruments;

•the impact of service interruptions or equipment damage and the cost of power on our data center operations;

•the cost or potential liabilities associated with real estate necessary for our business;

•unexpected events, including those resulting from climate change or geopolitical events, could disrupt our operations and adversely affect our reputation and results of operations;

•failures to implement and manage new IT systems;

•other trends in competitive or economic conditions affecting our financial condition or results of operations not presently contemplated; and

•the other risks described in our periodic reports filed with the SEC, including under the caption "Risk Factors" in Part I, Item 1A of our Annual Report on Form 10-K filed with the SEC on February 23, 2023.

Except as required by law, we undertake no obligation to update any forward-looking statements appearing in this report.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 30

Part I. Financial Information

OVERVIEW

The following discussions set forth, for the periods indicated, management's discussion and analysis of financial condition and results of operations. Significant trends and changes are discussed for the three and six months ended June 30, 2023 within each section. Trends and changes that are consistent for both the three and six month periods are not repeated and are discussed on a year to date basis only.

PROJECT MATTERHORN

In September 2022, we announced a global program designed to accelerate the growth of our business ("Project Matterhorn"). Project Matterhorn investments will focus on transforming our operating model to a global operating model. Project Matterhorn will focus on the formation of a solution-based sales approach that is designed to allow us to optimize our shared services and best practices to better serve our customers' needs. We will be investing to accelerate growth and to capture a greater share of the large, global addressable markets in which we operate. We expect to incur approximately $150.0 million in costs annually related to Project Matterhorn from 2023 through 2025. Costs are comprised of (1) restructuring costs, which include (i) site consolidation and other related exit costs, (ii) employee severance costs and (iii) certain professional fees associated with these activities, and (2) other transformation costs, which include professional fees such as project management costs and costs for third party consultants who are assisting in the enablement of our growth initiatives. There were no Restructuring and other transformation costs related to Project Matterhorn for the three and six months ended June 30, 2022. The following chart presents (in thousands) total Restructuring and other transformation costs related to Project Matterhorn from the inception of Project Matterhorn through June 30, 2023 and for the three and six months ended June 30, 2023:

From the Inception of Project Matterhorn through June 30, 2023
For the Three Months Ended June 30, 2023
For the Six Months Ended June 30, 2023

See Note 11 to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for more information on Restructuring and other transformation costs.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 31

Part I. Financial Information

GENERAL

RESULTS OF OPERATIONS - KEY TRENDS

•We have experienced steady volume in our Global RIM Business segment, with organic storage rental revenue growth driven primarily by revenue management. We expect organic storage rental revenue growth to benefit from revenue management and volume to be relatively stable in the near term.

•Our organic service revenue growth is primarily due to increases in our service activity. We expect organic service revenue growth in 2023 to benefit from our new and existing digital offerings, as well as our traditional services.

•We expect continued total revenue and Adjusted EBITDA growth in 2023 as a result of our focus on new product and service offerings, innovation, customer solutions and market expansion in line with our Project Matterhorn objectives.

Cost of sales (excluding depreciation and amortization) and Selling, general and administrative expenses for the six months ended June 30, 2023 consists of the following:

COST OF SALES	SELLING, GENERAL AND ADMINISTRATIVE EXPENSES

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 32

Part I. Financial Information

NON-GAAP MEASURES

ADJUSTED EBITDA

We define Adjusted EBITDA as net income (loss) before interest expense, net, provision (benefit) for income taxes, depreciation and amortization (inclusive of our share of Adjusted EBITDA from our unconsolidated joint ventures), and excluding certain items we do not believe to be indicative of our core operating results, specifically:

EXCLUDED
•Acquisition and Integration Costs (as defined below) •Restructuring and other transformation •(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	•Other expense (income), net •Stock-based compensation expense

Adjusted EBITDA Margin is calculated by dividing Adjusted EBITDA by total revenues. We also show Adjusted EBITDA and Adjusted EBITDA Margin for each of our reportable segments under "Results of Operations – Segment Analysis" below.

Adjusted EBITDA excludes both interest expense, net and the provision (benefit) for income taxes. These expenses are associated with our capitalization and tax structures, which we do not consider when evaluating the operating profitability of our core operations. Adjusted EBITDA does not include depreciation and amortization expenses, in order to eliminate the impact of capital investments, which we evaluate by comparing capital expenditures to incremental revenue generated and as a percentage of total revenues. Adjusted EBITDA and Adjusted EBITDA Margin should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with accounting principles generally accepted in the United States of America ("GAAP"), such as operating income, net income (loss) or cash flows from operating activities.

RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA (IN THOUSANDS):

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Add/(Deduct):
Interest expense, net	144,178		115,057		281,347		229,499
Provision (benefit) for income taxes	4,255		18,083		21,013		28,163
Depreciation and amortization	195,367		178,254		377,461		361,869
Acquisition and Integration Costs(1)	1,511		16,878		3,106		32,539
Restructuring and other transformation	45,588		—		82,501		—
(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	(1,505)		(51,249)		(14,566)		(51,954)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	58,694		(46,103)		76,185		7,412
Stock-based compensation expense	22,373		20,256		34,882		31,597
Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures	4,054		1,672		7,859		3,010
Adjusted EBITDA	$	475,658	$	454,706	$	936,466	$	885,700

(1)Represent operating expenditures directly associated with the closing and integration activities of our business acquisitions that have closed, or are highly probable of closing, and include (i) advisory, legal and professional fees to complete business acquisitions and (ii) costs to integrate acquired businesses into our existing operations, including move, severance and system integration costs (collectively, "Acquisition and Integration Costs").

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 33

Part I. Financial Information

ADJUSTED EPS

We define Adjusted EPS as reported earnings per share fully diluted from net income (loss) attributable to Iron Mountain Incorporated (inclusive of our share of adjusted losses (gains) from our unconsolidated joint ventures) and excluding certain items, specifically:

EXCLUDED
•Acquisition and Integration Costs •Restructuring and other transformation •Amortization related to the write-off of certain customer relationship intangible assets •(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	•Other expense (income), net •Stock-based compensation expense •Non-cash amortization related to derivative instruments •Tax impact of reconciling items and discrete tax items

We do not believe these excluded items to be indicative of our ongoing operating results, and they are not considered when we are forecasting our future results. We believe Adjusted EPS is of value to our current and potential investors when comparing our results from past, present and future periods.

RECONCILIATION OF REPORTED EPS—FULLY DILUTED FROM NET INCOME (LOSS) ATTRIBUTABLE TO IRON MOUNTAIN INCORPORATED TO ADJUSTED EPS—FULLY DILUTED FROM NET INCOME (LOSS) ATTRIBUTABLE TO IRON MOUNTAIN INCORPORATED:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Reported EPS—Fully Diluted from Net Income (Loss) Attributable to Iron Mountain Incorporated	$	0.00	$	0.68	$	0.22	$	0.83
Add/(Deduct):
Acquisition and Integration Costs	0.01		0.06		0.01		0.11
Restructuring and other transformation	0.16		—		0.28		—
Amortization related to the write-off of certain customer relationship intangible assets	—		—		—		0.02
(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	(0.01)		(0.18)		(0.05)		(0.18)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	0.20		(0.16)		0.26		0.03
Stock-based compensation expense	0.08		0.07		0.12		0.11
Non-cash amortization related to derivative instruments	0.02		—		0.04		—
Tax impact of reconciling items and discrete tax items(1)	(0.05)		(0.03)		(0.06)		(0.07)
Income (Loss) Attributable to Noncontrolling Interests	—		0.01		0.01		—
Adjusted EPS—Fully Diluted from Net Income (Loss) Attributable to Iron Mountain Incorporated(2)	$	0.40	$	0.46	$	0.83	$	0.85

(1)The difference between our effective tax rates and our structural tax rate (or adjusted effective tax rates) for the three and six months ended June 30, 2023 and 2022 is primarily due to (i) the reconciling items above, which impact our reported net income (loss) before provision (benefit) for income taxes but have an insignificant impact on our reported provision (benefit) for income taxes and (ii) other discrete tax items. Our structural tax rate for purposes of the calculation of Adjusted EPS for the three and six months ended June 30, 2023 and 2022 was 14.0% and 16.5%, respectively. The Tax impact of reconciling items and discrete tax items is calculated using the current quarter's estimate of the annual structural tax rate. This may result in the current period adjustment plus prior period reported quarterly adjustments not summing to the full year adjustment.

(2)Columns may not foot due to rounding.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 34

Part I. Financial Information

FFO (NAREIT) AND FFO (NORMALIZED)

Funds from operations ("FFO") is defined by the National Association of Real Estate Investment Trusts as net income (loss) excluding depreciation on real estate assets, losses and gains on sale of real estate, net of tax, and amortization of data center leased-based intangibles ("FFO (Nareit)"). We calculate our FFO measures, including FFO (Nareit), adjusting for our share of reconciling items from our unconsolidated joint ventures. FFO (Nareit) does not give effect to real estate depreciation because these amounts are computed, under GAAP, to allocate the cost of a property over its useful life. Because values for well-maintained real estate assets have historically increased or decreased based upon prevailing market conditions, we believe that FFO (Nareit) provides investors with a clearer view of our operating performance. Our most directly comparable GAAP measure to FFO (Nareit) is net income (loss).

We modify FFO (Nareit), as is common among REITs seeking to provide financial measures that most meaningfully reflect their particular business ("FFO (Normalized)"). Our definition of FFO (Normalized) excludes certain items included in FFO (Nareit) that we believe are not indicative of our core operating results, specifically:

EXCLUDED
•Acquisition and Integration Costs •Restructuring and other transformation •(Gain) loss on disposal/write-down of property, plant and equipment, net (excluding real estate) •Other expense (income), net	•Stock-based compensation expense •Non-cash amortization related to derivative instruments •Real estate financing lease depreciation •Tax impact of reconciling items and discrete tax items

RECONCILIATION OF NET INCOME (LOSS) TO FFO (NAREIT) AND FFO (NORMALIZED) (IN THOUSANDS):

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Add/(Deduct):
Real estate depreciation	81,558		75,008		157,687		154,341
(Gain) loss on sale of real estate, net of tax	(1,853)		(48,978)		(17,599)		(48,764)
Data center lease-based intangible assets amortization	4,907		4,040		11,036		8,163
Our share of FFO (Nareit) reconciling items from our unconsolidated joint ventures	562		—		694		—
FFO (Nareit)	86,317		231,928		218,496		357,305
Add/(Deduct):
Acquisition and Integration Costs	1,511		16,878		3,106		32,539
Restructuring and other transformation	45,588		—		82,501		—
(Gain) loss on disposal/write-down of property, plant and equipment, net (excluding real estate)	(1,417)		(2,270)		3,133		(3,189)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures(1)	58,694		(46,103)		76,185		7,412
Stock-based compensation expense	22,373		20,256		34,882		31,597
Non-cash amortization related to derivative instruments	5,817		—		11,651		—
Real estate financing lease depreciation	3,008		3,427		5,996		7,207
Tax impact of reconciling items and discrete tax items(2)	(13,278)		(8,250)		(18,491)		(20,876)
Our share of FFO (Normalized) reconciling items from our unconsolidated joint ventures	(500)		374		(274)		354
FFO (Normalized)	$	208,113	$	216,240	$	417,185	$	412,349

(1)Includes foreign currency transaction (gains) losses, net and other, net. See Note 2.k. to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for additional information regarding the components of Other expense (income), net.

(2)Represents the tax impact of (i) the reconciling items above, which impact our reported net income (loss) before provision (benefit) for income taxes but have an insignificant impact on our reported provision (benefit) for income taxes and (ii) other discrete tax items. Discrete tax items resulted in a (benefit) provision for income taxes of $(5.0) million and $(5.5) million for the three and six months ended June 30, 2023, respectively, and $(0.2) million and $(10.2) million for the three and six months ended June 30, 2022, respectively.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 35

Part I. Financial Information

CRITICAL ACCOUNTING ESTIMATES

Our discussion and analysis of our financial condition and results of operations are based upon our Condensed Consolidated Financial Statements, which have been prepared in accordance with GAAP. The preparation of these financial statements requires us to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities at the date of the financial statements and for the period then ended. On an ongoing basis, we evaluate the estimates used. We base our estimates on historical experience, actuarial estimates, current conditions and various other assumptions that we believe to be reasonable under the circumstances. These estimates form the basis for making judgments about the carrying values of assets and liabilities and are not readily apparent from other sources. Actual results may differ from these estimates. Our critical accounting estimates include the following, which are listed in no particular order:

•Revenue Recognition

•Accounting for Acquisitions

•Impairment of Tangible and Intangible Assets

•Income Taxes

Further detail regarding our critical accounting estimates can be found in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Report, and the Consolidated Financial Statements and the Notes included therein. We have determined that no material changes concerning our critical accounting estimates have occurred since December 31, 2022.

RESULTS OF OPERATIONS

COMPARISON OF THE THREE AND SIX MONTHS ENDED JUNE 30, 2023 TO THE THREE AND SIX MONTHS ENDED JUNE 30, 2022 (IN THOUSANDS):

	THREE MONTHS ENDED JUNE 30,						DOLLAR CHANGE		PERCENTAGE CHANGE
	2023			2022
Revenues	$	1,357,936		$	1,289,534		$	68,402	5.3	%
Operating Expenses	1,145,410			995,753			149,657		15.0	%
Operating Income	212,526			293,781			(81,255)		(27.7)	%
Other Expenses, Net	211,383			91,923			119,460		130.0	%
Net Income (Loss)	1,143			201,858			(200,715)		(99.4)	%
Net Income (Loss) Attributable to Noncontrolling Interests	1,029			1,777			(748)		(42.1)	%
Net Income (Loss) Attributable to Iron Mountain Incorporated	$	114		$	200,081		$	(199,967)	(99.9)	%
Adjusted EBITDA(1)	$	475,658		$	454,706		$	20,952	4.6	%
Adjusted EBITDA Margin(1)	35.0		%	35.3		%

	SIX MONTHS ENDED JUNE 30,						DOLLAR CHANGE		PERCENTAGE CHANGE
	2023			2022
Revenues	$	2,672,285		$	2,537,580		$	134,705	5.3	%
Operating Expenses	2,219,097			2,021,669			197,428		9.8	%
Operating Income	453,188			515,911			(62,723)		(12.2)	%
Other Expenses, Net	386,510			272,346			114,164		41.9	%
Net Income (Loss)	66,678			243,565			(176,887)		(72.6)	%
Net Income (Loss) Attributable to Noncontrolling Interests	1,969			1,185			784		66.2	%
Net Income (Loss) Attributable to Iron Mountain Incorporated	$	64,709		$	242,380		$	(177,671)	(73.3)	%
Adjusted EBITDA(1)	$	936,466		$	885,700		$	50,766	5.7	%
Adjusted EBITDA Margin(1)	35.0		%	34.9		%

(1)See "Non-GAAP Measures—Adjusted EBITDA" in this Quarterly Report for the definitions of Adjusted EBITDA and Adjusted EBITDA Margin, reconciliation of Net Income (Loss) to Adjusted EBITDA and a discussion of why we believe these non-GAAP measures provide relevant and useful information to our current and potential investors.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 36

Part I. Financial Information

REVENUES

Total revenues consist of the following (in thousands):

	THREE MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE
	2023		2022		DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY(1)		ORGANIC GROWTH(2)		IMPACT OF ACQUISITIONS
Storage Rental	$	830,756	$	753,126	$	77,630	10.3	%	10.9	%	10.8	%	0.1	%
Service	527,180		536,408		(9,228)		(1.7)	%	(1.0)	%	(1.4)	%	0.4	%
Total Revenues	$	1,357,936	$	1,289,534	$	68,402	5.3	%	6.0	%	5.7	%	0.3	%

	SIX MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE
	2023		2022		DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY(1)		ORGANIC GROWTH(2)		IMPACT OF ACQUISITIONS
Storage Rental	$	1,640,845	$	1,504,196	$	136,649	9.1	%	10.6	%	11.0	%	(0.4)	%
Service	1,031,440		1,033,384		(1,944)		(0.2)	%	1.1	%	0.2	%	0.9	%
Total Revenues	$	2,672,285	$	2,537,580	$	134,705	5.3	%	6.7	%	6.6	%	0.1	%

(1)Constant currency growth rates, which are a non-GAAP measure, are calculated by translating the 2022 results at the 2023 average exchange rates.

(2)Our organic revenue growth rate, which is a non-GAAP measure, represents the year-over-year growth rate of our revenues excluding the impact of business acquisitions, divestitures and foreign currency exchange rate fluctuations. Our organic revenue growth rate includes the impact of acquisitions of customer relationships.

TOTAL REVENUES

For the six months ended June 30, 2023, the increase in reported revenue was primarily driven by organic storage rental revenue growth. Foreign currency exchange rate fluctuations decreased our reported revenue growth rate for the six months ended June 30, 2023 by 1.4% compared to the prior year period.

STORAGE RENTAL REVENUE AND SERVICE REVENUE

Primary factors influencing the change in reported storage rental revenue and reported service revenue for the six months ended June 30, 2023 compared to the six months ended June 30, 2022 include the following:

STORAGE RENTAL REVENUE	•organic storage rental revenue growth driven by increased volume in faster growing markets and our Global Data Center Business segment and revenue management; •a 0.1% increase in total global volume; and •a decrease of $20.0 million due to foreign currency exchange rate fluctuations.
SERVICE REVENUE	•organic service revenue growth driven by increased service activity levels in our Global RIM business, partially offset by service revenue declines in our asset lifecycle management business as a result of component price declines, partially offset by increased volume; and •a decrease of $13.6 million due to foreign currency exchange rate fluctuations.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 37

Part I. Financial Information

OPERATING EXPENSES

COST OF SALES

Cost of sales (excluding depreciation and amortization) consists of the following expenses (in thousands):

	THREE MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE				% OF TOTAL REVENUES				PERCENTAGE CHANGE (FAVORABLE)/ UNFAVORABLE
	2023		2022		DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		2023		2022
Labor	$	224,398	$	203,459	$	20,939	10.3	%	11.0	%	16.5	%	15.8	%	0.7	%
Facilities	255,535		213,795		41,740		19.5	%	20.3	%	18.8	%	16.6	%	2.2	%
Transportation	41,147		42,391		(1,244)		(2.9)	%	(2.0)	%	3.0	%	3.3	%	(0.3)	%
Product Cost of Sales and Others	71,564		96,831		(25,267)		(26.1)	%	(25.7)	%	5.3	%	7.5	%	(2.2)	%
Total Cost of sales	$	592,644	$	556,476	$	36,168	6.5	%	7.2	%	43.6	%	43.2	%	0.4	%

	SIX MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE				% OF TOTAL REVENUES				PERCENTAGE CHANGE (FAVORABLE)/ UNFAVORABLE
	2023		2022		DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		2023		2022
Labor	$	443,929	$	404,960	$	38,969	9.6	%	11.3	%	16.6	%	16.0	%	0.6	%
Facilities	496,225		432,114		64,111		14.8	%	16.7	%	18.6	%	17.0	%	1.6	%
Transportation	81,122		77,659		3,463		4.5	%	6.2	%	3.0	%	3.1	%	(0.1)	%
Product Cost of Sales and Others	142,994		188,365		(45,371)		(24.1)	%	(23.3)	%	5.4	%	7.4	%	(2.0)	%
Total Cost of sales	$	1,164,270	$	1,103,098	$	61,172	5.5	%	7.1	%	43.6	%	43.5	%	0.1	%

Primary factors influencing the change in reported Cost of sales for the six months ended June 30, 2023 compared to the six months ended June 30, 2022 include the following:

•an increase in labor costs driven by an increase in service activity, primarily within our Global RIM business;

•an increase in facilities expenses driven by increases in rent expense, reflecting the impact of our sale-leaseback activity during 2022 and the first six months of 2023, as well as increases in utilities costs and facility maintenance costs;

•a decrease in product cost of sales in our asset lifecycle management business as a result of component price declines, partially offset by increased volume; and

•a decrease of $15.8 million due to foreign currency exchange rate fluctuations.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 38

Part I. Financial Information

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES

Selling, general and administrative expenses consists of the following expenses (in thousands):

	THREE MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE				% OF TOTAL REVENUES				PERCENTAGE CHANGE (FAVORABLE)/ UNFAVORABLE
	2023		2022		DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		2023		2022
General, Administrative and Other	$	217,965	$	220,891	$	(2,926)	(1.3)	%	0.3	%	16.1	%	17.1	%	(1.0)	%
Sales, Marketing and Account Management	93,840		74,503		19,337		26.0	%	26.5	%	6.9	%	5.8	%	1.1	%
Total Selling, general and administrative expenses	$	311,805	$	295,394	$	16,411	5.6	%	7.0	%	23.0	%	22.9	%	0.1	%

	SIX MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE				% OF TOTAL REVENUES				PERCENTAGE CHANGE (FAVORABLE)/ UNFAVORABLE
	2023		2022		DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		2023		2022
General, Administrative and Other	$	424,988	$	427,207	$	(2,219)	(0.5)	%	1.6	%	15.9	%	16.8	%	(0.9)	%
Sales, Marketing and Account Management	181,337		148,910		32,427		21.8	%	23.3	%	6.8	%	5.9	%	0.9	%
Total Selling, general and administrative expenses	$	606,325	$	576,117	$	30,208	5.2	%	7.2	%	22.7	%	22.7	%	—	%

Primary factors influencing the change in reported Selling, general and administrative expenses for the six months ended June 30, 2023 compared to the six months ended June 30, 2022 include the following:

•an increase in sales, marketing and account management expenses, driven by higher compensation expense, primarily reflecting increased headcount; and

•a decrease of $10.6 million due to foreign currency exchange rate fluctuations.

DEPRECIATION AND AMORTIZATION

Depreciation expense increased by $17.9 million, or 7.6%, for the six months ended June 30, 2023 compared to the prior year period. See Note 2.i. to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding the useful lives over which our property, plant and equipment is depreciated.

Amortization expense decreased by $2.3 million, or 1.8%, for the six months ended June 30, 2023 compared to the prior year period.

ACQUISITION AND INTEGRATION COSTS

Acquisition and Integration Costs for the six months ended June 30, 2023 and 2022 were approximately $3.1 million and $32.5 million, respectively.

RESTRUCTURING AND OTHER TRANSFORMATION

Restructuring and other transformation costs for the six months ended June 30, 2023 were $82.5 million and related to operating expenses associated with the implementation of Project Matterhorn. There were no Restructuring and other transformation costs for the six months ended June 30, 2022.

(GAIN) LOSS ON DISPOSAL/WRITE-DOWN OF PROPERTY, PLANT AND EQUIPMENT, NET

Gain on disposal/write-down of property, plant and equipment, net for the six months ended June 30, 2023 was approximately $14.6 million. The gains primarily consist of a gain of approximately $18.5 million associated with a sale-leaseback transaction of a facility in Singapore during the first quarter of 2023.

Gain on disposal/write-down of property, plant and equipment, net for the six months ended June 30, 2022 was approximately $52.0 million. The gains primarily consist of gains of approximately $49.0 million associated with sale and sale-leaseback transactions of 11 facilities and parcels of land in the United States during the second quarter of 2022.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 39

Part I. Financial Information

OTHER EXPENSES, NET

INTEREST EXPENSE, NET

Interest expense, net increased by $51.8 million to $281.3 million in the six months ended June 30, 2023 from $229.5 million in the prior year period. The increase is primarily due to higher average debt outstanding during the six months ended June 30, 2023 compared to the prior year period as well as an increase in our weighted average interest rate. Our weighted average interest rate, inclusive of the fees associated with our outstanding letters of credit, was 5.4% and 4.6% at June 30, 2023 and 2022, respectively. See Note 6 to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for additional information regarding our indebtedness.

OTHER EXPENSE (INCOME), NET

Other expense (income), net for the three and six months ended June 30, 2023 and 2022 consists of the following (in thousands):

	THREE MONTHS ENDED JUNE 30,				DOLLAR CHANGE		SIX MONTHS ENDED JUNE 30,				DOLLAR CHANGE
DESCRIPTION	2023		2022				2023		2022
Foreign currency transaction losses (gains), net(1)	$	15,063	$	(55,039)	$	70,102	$	29,487	$	(68,240)	$	97,727
Debt extinguishment expense	—		—		—		—		671		(671)
Other, net(2)	47,887		13,822		34,065		54,663		82,253		(27,590)
Other Expense (Income), Net	$	62,950	$	(41,217)	$	104,167	$	84,150	$	14,684	$	69,466

(1)The losses for the three and six months ended June 30, 2023 primarily consist of the impact of changes in the exchange rate of the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(2)Other, net for the six months ended June 30, 2023 consists primarily of a loss of approximately $38.0 million associated with the remeasurement to fair value of our previously held equity interest in the Clutter JV. See the Investments section of Liquidity and Capital Resources for additional information. We also recognized losses on our equity method investments and the change in value of the Deferred Purchase Obligation (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report).

PROVISION FOR INCOME TAXES

We provide for income taxes during interim periods based on our estimate of the effective tax rate for the year. Our effective tax rates for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023(1)		2022		2023(1)		2022
Effective Tax Rate	78.8	%	8.2	%	24.0	%	10.4	%

(1)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2023 were (i) the loss of approximately $38.0 million recorded in Other, net a component of Other expense (income), net during the second quarter of 2023 to reflect the remeasurement of our previously held equity interest in the Clutter JV to fair value, for which there was no tax impact, (ii) the benefits derived from the dividends paid deduction and (iii) the differences in the tax rates to which our foreign earnings are subject.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 40

Part I. Financial Information

NET INCOME (LOSS) AND ADJUSTED EBITDA

The following table reflects the effect of the foregoing factors on our net income (loss) and Adjusted EBITDA (in thousands):

	THREE MONTHS ENDED JUNE 30,						DOLLAR CHANGE		PERCENTAGE CHANGE
	2023			2022
Net Income (Loss)	$	1,143		$	201,858		$	(200,715)	(99.4)	%
Net Income (Loss) as a percentage of Revenue	0.1		%	15.7		%
Adjusted EBITDA	$	475,658		$	454,706		$	20,952	4.6	%
Adjusted EBITDA Margin	35.0		%	35.3		%

	SIX MONTHS ENDED JUNE 30,						DOLLAR CHANGE		PERCENTAGE CHANGE
	2023			2022
Net Income (Loss)	$	66,678		$	243,565		$	(176,887)	(72.6)	%
Net Income (Loss) as a percentage of Revenue	2.5		%	9.6		%
Adjusted EBITDA	$	936,466		$	885,700		$	50,766	5.7	%
Adjusted EBITDA Margin	35.0		%	34.9		%

Adjusted EBITDA Margin for the six months ended June 30, 2023 increased by 10 basis points compared to the same prior year period driven by improved service revenue trends, revenue management and ongoing cost containment measures, partially offset by lower Adjusted EBITDA Margin in our asset lifecycle management business. ↑ INCREASED BY $50.8 MILLION OR 5.7% Adjusted EBITDA

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 41

Part I. Financial Information

SEGMENT ANALYSIS

See Note 9 to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for a description of our reportable segments.

GLOBAL RIM BUSINESS (IN THOUSANDS)

	THREE MONTHS ENDED  JUNE 30,								PERCENTAGE CHANGE
							DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		ORGANIC GROWTH		IMPACT OF ACQUISITIONS
	2023			2022
Storage Rental	$	704,011		$	649,771		$	54,240	8.3	%	9.2	%	9.2	%	—	%
Service	455,856			420,705			35,151		8.4	%	9.3	%	9.3	%	—	%
Segment Revenue	$	1,159,867		$	1,070,476		$	89,391	8.4	%	9.2	%	9.2	%	—	%
Segment Adjusted EBITDA	$	499,062		$	469,368		$	29,694
Segment Adjusted EBITDA Margin	43.0		%	43.8		%

	SIX MONTHS ENDED  JUNE 30,								PERCENTAGE CHANGE
							DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		ORGANIC GROWTH		IMPACT OF ACQUISITIONS
	2023			2022
Storage Rental	$	1,391,680		$	1,299,858		$	91,822	7.1	%	8.7	%	9.3	%	(0.6)	%
Service	894,713			819,509			75,204		9.2	%	10.9	%	11.4	%	(0.5)	%
Segment Revenue	$	2,286,393		$	2,119,367		$	167,026	7.9	%	9.5	%	10.1	%	(0.6)	%
Segment Adjusted EBITDA	$	976,846		$	918,163		$	58,683
Segment Adjusted EBITDA Margin	42.7		%	43.3		%

SIX MONTHS ENDED YEAR OVER YEAR SEGMENT ANALYSIS: GLOBAL RIM BUSINESS (IN MILLIONS)

Storage Rental
Revenue Service
Revenue Segment
Revenue Segment Adjusted
EBITDA

Primary factors influencing the change in revenue and Adjusted EBITDA Margin in our Global RIM Business segment for the six months ended June 30, 2023 compared to the prior year period include the following:

•organic storage rental revenue growth driven by revenue management;

•organic service revenue growth primarily driven by increases in our traditional service activity levels and growth in our Global Digital Solutions business;

•a decrease in revenue of $31.7 million due to foreign currency exchange rate fluctuations; and

•a 60 basis point decrease in Adjusted EBITDA Margin primarily driven by an increase in compensation and other employee-related costs, partially offset by revenue management.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 42

Part I. Financial Information

GLOBAL DATA CENTER BUSINESS (IN THOUSANDS)

	THREE MONTHS ENDED JUNE 30,								PERCENTAGE CHANGE
							DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		ORGANIC GROWTH		IMPACT OF ACQUISITIONS
	2023			2022
Storage Rental	$	110,990		$	89,768		$	21,222	23.6	%	23.0	%	22.3	%	0.7	%
Service	7,043			10,320			(3,277)		(31.8)	%	(33.2)	%	(32.4)	%	(0.8)	%
Segment Revenue	$	118,033		$	100,088		$	17,945	17.9	%	17.1	%	16.7	%	0.4	%
Segment Adjusted EBITDA	$	53,809		$	42,307		$	11,502
Segment Adjusted EBITDA Margin	45.6		%	42.3		%

	SIX MONTHS ENDED JUNE 30,								PERCENTAGE CHANGE
							DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		ORGANIC GROWTH		IMPACT OF ACQUISITIONS
	2023			2022
Storage Rental	$	218,425		$	177,219		$	41,206	23.3	%	23.6	%	23.0	%	0.6	%
Service	11,913			19,856			(7,943)		(40.0)	%	(40.1)	%	(39.8)	%	(0.3)	%
Segment Revenue	$	230,338		$	197,075		$	33,263	16.9	%	17.2	%	16.7	%	0.5	%
Segment Adjusted EBITDA	$	104,444		$	84,284		$	20,160
Segment Adjusted EBITDA Margin	45.3		%	42.8		%

SIX MONTHS ENDED YEAR OVER YEAR SEGMENT ANALYSIS: GLOBAL DATA CENTER BUSINESS (IN MILLIONS)

Storage Rental
Revenue Service
Revenue Segment
Revenue Segment Adjusted
EBITDA

Primary factors influencing the change in revenue, Adjusted EBITDA and Adjusted EBITDA Margin in our Global Data Center Business segment for the six months ended June 30, 2023 compared to the prior year period include the following:

•organic storage rental revenue growth from leases that commenced during the first six months of 2023 and in prior periods, improved pricing and higher pass-through power costs, partially offset by churn of 280 basis points;

•an increase in Adjusted EBITDA primarily driven by organic storage rental revenue growth; and

•a 250 basis point increase in Adjusted EBITDA Margin reflecting ongoing cost management and a decline in lower margin project revenue, partially offset by higher pass-through power costs.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 43

Part I. Financial Information

CORPORATE AND OTHER (IN THOUSANDS)

	THREE MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE
					DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		ORGANIC GROWTH		IMPACT OF ACQUISITIONS
	2023		2022
Storage Rental	$	15,755	$	13,587	$	2,168	16.0	%	15.8	%	11.5	%	4.3	%
Service	64,281		105,383		(41,102)		(39.0)	%	(38.9)	%	(41.0)	%	2.1	%
Revenue	$	80,036	$	118,970	$	(38,934)	(32.7)	%	(32.6)	%	(35.0)	%	2.4	%
Adjusted EBITDA	$	(77,213)	$	(56,969)	$	(20,244)

	SIX MONTHS ENDED JUNE 30,						PERCENTAGE CHANGE
					DOLLAR CHANGE		ACTUAL		CONSTANT CURRENCY		ORGANIC GROWTH		IMPACT OF ACQUISITIONS
	2023		2022
Storage Rental	$	30,740	$	27,119	$	3,621	13.4	%	14.1	%	10.0	%	4.1	%
Service	124,814		194,019		(69,205)		(35.7)	%	(35.3)	%	(42.4)	%	7.1	%
Revenue	$	155,554	$	221,138	$	(65,584)	(29.7)	%	(29.2)	%	(36.0)	%	6.8	%
Adjusted EBITDA	$	(144,824)	$	(116,747)	$	(28,077)

Primary factors influencing the change in revenue and Adjusted EBITDA in Corporate and Other for the six months ended June 30, 2023 compared to the prior year period include the following:

•a decrease in service revenue in our asset lifecycle management business as a result of component price declines, which we expect to improve from current levels, partially offset by increased volume; and

•a decrease in Adjusted EBITDA driven by the flow through of service revenue declines in our asset lifecycle management business.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 44

Part I. Financial Information

LIQUIDITY AND CAPITAL RESOURCES

GENERAL

We expect to meet our short-term and long-term cash flow requirements through cash generated from operations, cash on hand, borrowings under our Credit Agreement (as defined below) and proceeds from monetizing a small portion of our total industrial real estate assets, as well as other potential financings (such as the issuance of debt). Our cash flow requirements, both in the near and long term, include, but are not limited to, capital expenditures, the repayment of outstanding debt, shareholder dividends, potential business acquisitions and normal business operation needs.

PROJECT MATTERHORN

As disclosed above, in September 2022, we announced Project Matterhorn. We estimate that the implementation of Project Matterhorn will result in costs of approximately $150.0 million per year from 2023 through 2025. Total costs related to Project Matterhorn during the three and six months ended June 30, 2023 were approximately $45.6 million and $82.5 million, respectively, and are included in Restructuring and other transformation in our Condensed Consolidated Statement of Operations. Total costs from inception of the program to June 30, 2023 were approximately $124.4 million. There were no Restructuring and other transformation costs related to Project Matterhorn for the three and six months ended June 30, 2022.

CASH FLOWS

The following is a summary of our cash balances and cash flows (in thousands) as of and for the six months ended June 30,

	2023		2022
Cash Flows from Operating Activities	$	446,094	$	345,924
Cash Flows from Investing Activities	(645,282)		(991,103)
Cash Flows from Financing Activities	209,827		542,000
Cash and Cash Equivalents, End of Period	149,493		144,746

A. CASH FLOWS FROM OPERATING ACTIVITIES

For the six months ended June 30, 2023, net cash flows provided by operating activities increased by $100.2 million compared to the prior year period, primarily due to an increase in cash from working capital of $105.3 million, primarily related to the timing of accounts receivable collections, partially offset by a decrease in net income (excluding non-cash charges) of $5.1 million.

B. CASH FLOWS FROM INVESTING ACTIVITIES

Our significant investing activity during the six months ended June 30, 2023 included cash paid for capital expenditures of $600.8 million. Additional details of our capital spending are included in the "Capital Expenditures" section below.

C. CASH FLOWS FROM FINANCING ACTIVITIES

Our significant financing activities during the six months ended June 30, 2023 included:

•Net proceeds of $990.0 million associated with the issuance of the 7% Notes due 2029 (as defined below).

•Net payments of $403.2 million primarily associated with repayments on our Revolving Credit Facility (as defined in Note 6 to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report).

•Payment of dividends in the amount of $367.1 million on our common stock.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 45

Part I. Financial Information

CAPITAL EXPENDITURES

The following table presents our capital spend for the six months ended June 30, 2023 and 2022, organized by the type of the spending as described in our Annual Report (in thousands):

	SIX MONTHS ENDED JUNE 30,
NATURE OF CAPITAL SPEND	2023		2022
Growth Investment Capital Expenditures:
Data Center	$	417,861	$	183,815
Real Estate	104,862		66,855
Innovation and Other	37,644		20,958
Total Growth Investment Capital Expenditures	560,367		271,628
Recurring Capital Expenditures:
Real Estate	$	19,552	$	23,672
Non-Real Estate	34,662		37,834
Data Center	6,415		5,678
Total Recurring Capital Expenditures	60,629		67,184
Total Capital Spend (on accrual basis)	$	620,996	$	338,812
Net (decrease) increase in prepaid capital expenditures	(630)		1,407
Net (increase) decrease in accrued capital expenditures	(19,608)		(9,999)
Total Capital Spend (on cash basis)	$	600,758	$	330,220

Excluding capital expenditures associated with potential future acquisitions, we expect total capital expenditures of approximately $1,200.0 million for the year ending December 31, 2023. Of this, we expect our capital expenditures for growth investment to be approximately $1,055.0 million, and our recurring capital expenditures to approach $145.0 million.

DIVIDENDS

See Note 8 to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for a listing of dividends that we declared during the first six months of 2023 and fiscal year 2022.

On August 3, 2023, we declared a dividend to our stockholders of record as of September 15, 2023 of $0.65 per share, payable on October 5, 2023.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 46

Part I. Financial Information

FINANCIAL INSTRUMENTS AND DEBT

Financial instruments that potentially subject us to credit risk consist principally of cash and cash equivalents (including money market funds) and accounts receivable. The only significant concentration of liquid investments as of June 30, 2023 is related to cash and cash equivalents held in money market funds. See Note 2.e. to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for information on our money market funds.

Long-term debt as of June 30, 2023 is as follows (in thousands):

	JUNE 30, 2023
	DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT
Revolving Credit Facility(1)	$	679,500	$	(5,332)	$	674,168
Term Loan A(1)	234,375		—		234,375
Term Loan B(1)(3)	662,685		(3,122)		659,563
Australian Dollar Term Loan	196,333		(543)		195,790
UK Bilateral Revolving Credit Facility	177,277		—		177,277
37/8% GBP Senior Notes due 2025 (the "GBP Notes")	506,506		(2,231)		504,275
47/8% Senior Notes due 2027 (the "47/8% Notes due 2027")(2)	1,000,000		(6,043)		993,957
51/4% Senior Notes due 2028 (the "51/4% Notes due 2028")(2)	825,000		(5,609)		819,391
5% Senior Notes due 2028 (the "5% Notes due 2028")(2)	500,000		(3,678)		496,322
7% Senior Notes due 2029 (the "7% Notes due 2029")(2)	1,000,000		(11,853)		988,147
47/8% Senior Notes due 2029 (the "47/8% Notes due 2029")(2)	1,000,000		(9,041)		990,959
51/4% Senior Notes due 2030 (the "51/4% Notes due 2030")(2)	1,300,000		(10,655)		1,289,345
41/2% Senior Notes due 2031 (the "41/2% Notes")(2)	1,100,000		(9,539)		1,090,461
5% Senior Notes due 2032 (the "5% Notes due 2032")	750,000		(11,858)		738,142
55/8% Senior Notes due 2032 (the "55/8% Notes")(2)	600,000		(5,275)		594,725
Real Estate Mortgages, Financing Lease Liabilities and Other	457,724		(483)		457,241
Accounts Receivable Securitization Program	343,100		(426)		342,674
Total Long-term Debt	11,332,500		(85,688)		11,246,812
Less Current Portion	(102,582)		—		(102,582)
Long-term Debt, Net of Current Portion	$	11,229,918	$	(85,688)	$	11,144,230

(1)Collectively, the “Credit Agreement”.

(2)Collectively, the "Parent Notes".

(3)Due to the discontinuance of the London Interbank Offered Rate ("LIBOR") reference rate on June 30, 2023, we transitioned the Term Loan B from an interest rate of LIBOR plus 1.75% to a synthetic LIBOR rate plus 1.75%, effective July 1, 2023.

See Note 7 to Notes to Consolidated Financial Statements included in our Annual Report and Note 6 to Notes to Condensed Consolidated Financial Statements included in this Quarterly Report for additional information regarding our long-term debt.

MAY 2023 OFFERING

On May 15, 2023, Iron Mountain Incorporated completed a private offering of (in thousands):

SERIES OF NOTES	AGGREGATE PRINCIPAL AMOUNT		MATURITY DATE	INTEREST PAYMENT DUE	PAR CALL DATE(1)
7% Notes due 2029	$	1,000,000	February 15, 2029	February 15 and August 15	August 15, 2025

(1)We may redeem the 7% Notes due 2029 at any time, at our option, in whole or in part. Prior to the par call date, we may redeem the 7% Notes due 2029 at the redemption price or make-whole premium specified in the indenture governing the 7% Notes due 2029, together with accrued and unpaid interest to, but excluding, the redemption date. On or after the par call date, we may redeem the 7% Notes due 2029 at a price equal to 100% of the principal amount being redeemed, together with accrued and unpaid interest to, but excluding, the redemption date.

The 7% Notes due 2029 were issued at 100% of par. The total net proceeds of approximately $990.0 million from the issuance of the 7% Notes due 2029, after deducting the initial purchasers' commissions, were used to repay a portion of the outstanding borrowings under our Revolving Credit Facility.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 47

Part I. Financial Information

ACCOUNTS RECEIVABLE SECURITIZATION PROGRAM

On June 8, 2023, we amended the Accounts Receivable Securitization Program (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report) to increase the maximum borrowing capacity from $325.0 million to $360.0 million. All other material terms of the Accounts Receivable Securitization Program remain the same as what was disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report.

LETTERS OF CREDIT

As of June 30, 2023, we had outstanding letters of credit totaling $40.4 million, of which $4.4 million reduce our borrowing capacity under the Revolving Credit Facility. The letters of credit expire at various dates between September 2023 and July 2025.

DEBT COVENANTS

The Credit Agreement, our bond indentures and other agreements governing our indebtedness contain certain restrictive financial and operating covenants, including covenants that restrict our ability to complete acquisitions, pay cash dividends, incur indebtedness, make investments, sell assets and take other specified corporate actions. The covenants do not contain a rating trigger. Therefore, a change in our debt rating would not trigger a default under the Credit Agreement, our bond indentures or other agreements governing our indebtedness. The Credit Agreement requires that we satisfy a net total lease adjusted leverage ratio and a fixed charge coverage ratio on a quarterly basis and our bond indentures require that, among other things, we satisfy a leverage ratio (not lease adjusted) or a fixed charge coverage ratio (not lease adjusted) as a condition to taking actions such as paying dividends and incurring indebtedness.

The Credit Agreement uses earnings before interest, taxes, depreciation and amortization and rent expense ("EBITDAR") based calculations and the bond indentures use earnings before interest, taxes, depreciation and amortization ("EBITDA") based calculations as the primary measures of financial performance for purposes of calculating leverage and fixed charge coverage ratios. The EBITDAR- and EBITDA-based leverage calculations include our consolidated subsidiaries, other than those we have designated as "Unrestricted Subsidiaries" as defined in the Credit Agreement and bond indentures. Generally, the Credit Agreement and the bond indentures use a trailing four fiscal quarter basis for purposes of the relevant calculations and require certain adjustments and exclusions for purposes of those calculations, which make the calculation of financial performance for purposes of those calculations under the Credit Agreement and bond indentures not directly comparable to Adjusted EBITDA as presented herein. These adjustments can be significant. For example, the calculation of financial performance under the Credit Agreement and certain of our bond indentures includes (subject to specified exceptions and caps) adjustments for non-cash charges and for expected benefits associated with (i) completed acquisitions, (ii) certain executed lease agreements associated with our data center business that have yet to commence, and (iii) restructuring and other strategic initiatives. The calculation of financial performance under our other bond indentures includes, for example, adjustments for non-cash charges and for expected benefits associated with (i) completed acquisitions and (ii) events that are extraordinary, unusual or non-recurring.

Our leverage and fixed charge coverage ratios under the Credit Agreement as of June 30, 2023 are as follows:

	JUNE 30, 2023	MAXIMUM/MINIMUM ALLOWABLE
Net total lease adjusted leverage ratio	5.1	Maximum allowable of 7.0
Fixed charge coverage ratio	2.3	Minimum allowable of 1.5

We are in compliance with our leverage and fixed charge coverage ratios under the Credit Agreement, our bond indentures and other agreements governing our indebtedness as of June 30, 2023. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity.

Our ability to pay interest on or to refinance our indebtedness depends on our future performance, working capital levels and capital structure, which are subject to general economic, financial, competitive, legislative, regulatory and other factors which may be beyond our control. There can be no assurance that we will generate sufficient cash flow from our operations or that future financings will be available on acceptable terms or in amounts sufficient to enable us to service or refinance our indebtedness or to make necessary capital expenditures.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 48

Part I. Financial Information

DERIVATIVE INSTRUMENTS

INTEREST RATE SWAP AGREEMENTS

In July 2019, we entered into forward-starting interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. These forward-starting interest rate swap agreements commenced in March 2022 with a total notional amount of $350.0 million and provided variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month LIBOR, in exchange for the payment of fixed interest rates as specified in the respective interest rate swap agreements. In April 2023, we terminated these agreements in anticipation of the discontinuance of the LIBOR reference rate on June 30, 2023. The terminated swap agreements had associated unrealized gains at the termination date of approximately $10.1 million. These gains are included in Accumulated other comprehensive items, net and will be reclassified into earnings as reductions to interest expense from the date of termination through March 2024, the original maturity date of the swaps.

In April 2023, we entered into interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. Under these interest rate swap agreements, we receive variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month Secured Overnight Financing Rate, in exchange for the payment of fixed interest rates as specified in the interest rate swap agreements. As of June 30, 2023, we have $350.0 million in notional value outstanding associated with these interest rate swap agreements, which expire in February 2026.

In November 2022, we entered into a forward-starting interest rate swap agreement to limit our exposure to changes in interest rates on future borrowings under our Virginia Credit Agreement (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report). This forward-starting interest rate swap agreement commenced in July 2023 and expires in October 2025. As of both June 30, 2023 and December 31, 2022, we have $4.8 million in notional value outstanding on this forward-starting interest rate swap agreement.

We have designated each of the interest rate swap agreements described above as cash flow hedges. These interest rate swap agreements are marked to market at the end of each reporting period, representing the fair values of the interest rate swap agreements, and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets, while unrealized losses are recognized as liabilities.

CROSS-CURRENCY SWAP AGREEMENTS

We utilize cross-currency interest rate swaps to hedge the variability of exchange rate impacts between the United States dollar and the Euro. As of both June 30, 2023 and December 31, 2022, we have approximately $469.2 million in notional value outstanding on cross-currency interest rate swaps, with maturity dates ranging from August 2023 through February 2026.

We have designated these cross-currency swap agreements as hedges of net investments in certain of our Euro denominated subsidiaries and they require an exchange of the notional amounts at maturity. These cross-currency swap agreements are marked to market at the end of each reporting period, representing the fair values of the cross-currency swap agreements, and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets while unrealized losses are recognized as liabilities. The excluded component of our cross-currency swap agreements is recorded in Accumulated other comprehensive items, net and amortized to interest expense on a straight-line basis.

ACQUISITIONS

CLUTTER

On June 29, 2023, in order to further expand our on-demand consumer storage business, we acquired 100% of the outstanding shares of Clutter Intermediate, Inc. and control of all assets of the Clutter JV (collectively, "Clutter") for total consideration of $59.1 million (the “Clutter Acquisition”). During the third quarter of 2023, we anticipate offering up to 15% equity interest in Clutter to certain former stakeholders of the Clutter JV.

INVESTMENTS

CLUTTER JOINT VENTURE

In February 2022, the joint venture formed by MakeSpace Labs, Inc. and us (the "MakeSpace JV") entered into an agreement with Clutter, Inc. pursuant to which the equityholders of the MakeSpace JV contributed their ownership interests in the MakeSpace JV, and Clutter, Inc.’s shareholders contributed their ownership interests in Clutter, Inc., to create a newly formed venture (the "Clutter JV"). In exchange for our 49.99% interest in the MakeSpace JV, we received an approximate 27% interest in the Clutter JV (the "Clutter Transaction"). As a result of the Clutter Transaction, we recognized a gain related to our contributed interest in the MakeSpace JV of approximately $35.8 million, which was recorded to Other, net, a component of Other expense (income), net, during the first quarter of 2022.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 49

Part I. Financial Information

On June 29, 2023, we completed the Clutter Acquisition. In connection with the Clutter Acquisition, our previously held approximately 27% interest in the Clutter JV was remeasured to fair value at the closing date of the Clutter Acquisition. As a result, we recognized a loss of approximately $38.0 million to Other, net, a component of Other expense (income), net, during the second quarter of 2023.

WEB WERKS JOINT VENTURE

In April 2021, we closed on an agreement to form a joint venture (the "Web Werks JV") with the shareholders of Web Werks India Private Limited, a colocation data center provider in India. Through December 31, 2022, we made two investments totaling approximately 7,500.0 million Indian rupees (or approximately $96.2 million, based upon the exchange rates between the United States dollar and Indian rupee on the closing date of each investment) in exchange for a noncontrolling interest in the form of convertible preference shares in the Web Werks JV. On July 7, 2023, we made our final contractual investment in the Web Werks JV of approximately 3,750.0 million Indian rupees (or approximately $45.3 million, based upon the exchange rate between the United States dollar and Indian rupee on the closing date of this investment). After the final contractual payment, our interest in the Web Werks JV increased to 63.39% and we assumed control of its board of directors. For financial reporting periods beginning after July 7, 2023, the Web Werks JV will be consolidated within our Global Data Center Business segment.

JOINT VENTURE SUMMARY

The following joint ventures are accounted for as equity method investments and are presented as a component of Other within Other assets, net in our Condensed Consolidated Balance Sheets. The carrying values and equity interests in our joint ventures at June 30, 2023 and December 31, 2022 are as follows (in thousands):

	JUNE 30, 2023				DECEMBER 31, 2022
	CARRYING VALUE		EQUITY INTEREST		CARRYING VALUE		EQUITY INTEREST
Web Werks JV	$	98,650	53.58	%	$	98,278	53.58	%
Joint venture with AGC Equity Partners	59,394		20.00	%	37,194		20.00	%
Clutter JV	—		—	%	54,172		26.73	%

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 50

Part I. Financial Information

ITEM 4. CONTROLS AND PROCEDURES

DISCLOSURE CONTROLS AND PROCEDURES

The term "disclosure controls and procedures" is defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). These rules refer to the controls and other procedures of a company that are designed to ensure that information is recorded, processed, accumulated, summarized, communicated and reported to management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding what is required to be disclosed by a company in the reports that it files under the Exchange Act. As of June 30, 2023 (the "Evaluation Date"), we carried out an evaluation, under the supervision and with the participation of our management, including our chief executive officer and chief financial officer, of the effectiveness of our disclosure controls and procedures. Based upon that evaluation, our chief executive officer and chief financial officer concluded that, as of the Evaluation Date, our disclosure controls and procedures are effective.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

Our management, with the participation of our principal executive officer and principal financial officer, is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act. Our internal control system is designed to provide reasonable assurance to our management and board of directors regarding the preparation and fair presentation of published financial statements.

There were no changes in our internal control over financial reporting that occurred during the quarter ended June 30, 2023, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 51

Part II. Other Information

PART II. OTHER INFORMATION

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

We did not sell any unregistered equity securities during the three months ended June 30, 2023, nor did we repurchase any shares of our common stock during the three months ended June 30, 2023.

ITEM 5. OTHER INFORMATION

On June 2, 2023, Mr. Edward Greene, our Executive Vice President, Chief Human Resources Officer, adopted a 10b5-1 trading plan to sell up to 4,851 shares of our common stock between September 5, 2023 and November 30, 2023.

On June 16, 2023, Mr. John Tomovcsik, our Executive Vice President, Chief Operating Officer, terminated a 10b5-1 trading plan that was adopted on March 3, 2023 to exercise options to purchase up to 36,824 shares of our common stock and sell up to 69,731 shares of our common stock between June 7, 2023 and February 29, 2024. On June 20, 2023, Mr. Tomovcsik adopted a 10b5-1 trading plan to exercise options to purchase up to 11,859 shares of our common stock and sell up to 41,859 shares of our common stock between September 18, 2023 and June 18, 2024.

Each of these arrangements is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934.

ITEM 6. EXHIBITS

(A) EXHIBITS

Certain exhibits indicated below are incorporated by reference to documents we have filed with the SEC.

EXHIBIT NO.	DESCRIPTION
3.1	Bylaws of Iron Mountain Incorporated. (Incorporated by reference to the Company's Current Report on Form 8-K dated May 12, 2023.)
4.1	2029 Senior Notes Indenture, dated as of May 15, 2023, among the Company, the Subsidiary Guarantors and Computershare Trust Company, N.A., as trustee, relating to the 7% Senior Notes due 2029. (Incorporated by reference to the Company's Current Report on Form 8-K dated May 15, 2023.)
31.1	Rule 13a-14(a) Certification of Chief Executive Officer. (Filed herewith.)
31.2	Rule 13a-14(a) Certification of Chief Financial Officer. (Filed herewith.)
32.1	Section 1350 Certification of Chief Executive Officer. (Furnished herewith.)
32.2	Section 1350 Certification of Chief Financial Officer. (Furnished herewith.)
101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	Inline XBRL Taxonomy Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 53

Part II. Other Information

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

IRON MOUNTAIN INCORPORATED
By:	/s/ DANIEL BORGES
	Daniel Borges  Senior Vice President, Chief Accounting Officer

Dated: August 3, 2023

IRON MOUNTAIN JUNE 30, 2023 FORM 10-Q 54

EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

I, William L. Meaney, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Iron Mountain Incorporated; 

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: 

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; 

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles; 

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 3, 2023

/s/ WILLIAM L. MEANEY

William L. Meaney

President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATIONS

I, Barry A. Hytinen, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Iron Mountain Incorporated;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: 

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; 

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and 

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions): 

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 3, 2023

/s/ BARRY A. HYTINEN

Barry A. Hytinen

Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the filing of the quarterly report on Form 10-Q for the quarter ended June 30, 2023 (the "Report") by Iron Mountain Incorporated (the "Company"), the undersigned, as the President and Chief Executive Officer of the Company, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.    the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

2.    the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 3, 2023

/s/ WILLIAM L. MEANEY

William L. Meaney

President and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

    In connection with the filing of the quarterly report on Form 10-Q for the quarter ended June 30, 2023 (the "Report") by Iron Mountain Incorporated (the "Company"), the undersigned, as the Executive Vice President and Chief Financial Officer of the Company, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.    the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

2.    the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 3, 2023

/s/ BARRY A. HYTINEN

Barry A. Hytinen

Executive Vice President and Chief Financial Officer

XML

Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Jul. 28, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	1-13045
Entity Registrant Name	IRON MOUNTAIN INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-2588479
Entity Address, Address Line One	85 New Hampshire Avenue
Entity Address, Address Line Two	Suite 150
Entity Address, City or Town	Portsmouth
Entity Address, State or Province	NH
Entity Address, Postal Zip Code	03801
City Area Code	617
Local Phone Number	535-4766
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	IRM
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Emerging Growth Company	false
Small Business Entity	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		291,852,409
Entity Central Index Key	0001020569
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 149,493	$ 141,797
Accounts receivable (less allowances of $65,217 and $54,143 as of June 30, 2023 and December 31, 2022, respectively)	1,182,154	1,174,915
Prepaid expenses and other	279,522	230,433
Total Current Assets	1,611,169	1,547,145
Property, Plant and Equipment:
Property, plant and equipment	9,546,766	9,025,765
Less—Accumulated depreciation	(3,943,300)	(3,910,321)
Property, Plant and Equipment, Net	5,603,466	5,115,444
Other Assets, Net:
Goodwill	4,928,145	4,882,734
Customer and supplier relationships and other intangible assets	1,348,679	1,423,145
Operating lease right-of-use assets	2,671,371	2,583,704
Other	515,739	588,342
Total Other Assets, Net	9,463,934	9,477,925
Total Assets	16,678,569	16,140,514
Current Liabilities:
Current portion of long-term debt	102,582	87,546
Accounts payable	482,244	469,198
Accrued expenses and other current liabilities (includes current portion of operating lease liabilities)	1,141,613	1,031,910
Deferred revenue	336,068	328,910
Total Current Liabilities	2,062,507	1,917,564
Long-term Debt, net of current portion	11,144,230	10,481,449
Long-term Operating Lease Liabilities, net of current portion	2,513,975	2,429,167
Other Long-term Liabilities	164,242	317,376
Deferred Income Taxes	273,213	263,005
Commitments and Contingencies
Redeemable Noncontrolling Interests	104,059	95,160
Equity:
Preferred stock (par value $0.01; authorized 10,000,000 shares; none issued and outstanding)	0	0
Common stock (par value $0.01; authorized 400,000,000 shares; issued and outstanding 291,824,958 and 290,830,296 shares as of June 30, 2023 and December 31, 2022, respectively)	2,918	2,908
Additional paid-in capital	4,488,492	4,468,035
(Distributions in excess of earnings) Earnings in excess of distributions	(3,692,948)	(3,392,272)
Accumulated other comprehensive items, net	(382,244)	(442,003)
Total Iron Mountain Incorporated Stockholders' Equity	416,218	636,668
Noncontrolling Interests	125	125
Total Equity	416,343	636,793
Total Liabilities and Equity	$ 16,678,569	$ 16,140,514

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 65,217	$ 54,143
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares (in shares)	10,000,000	10,000,000
Preferred stock, issued shares (in shares)	0	0
Preferred stock, outstanding shares (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	400,000,000	400,000,000
Common stock, issued shares (in shares)	291,824,958	290,830,296
Common stock, outstanding shares (in shares)	291,824,958	290,830,296

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Total Revenues	$ 1,357,936	$ 1,289,534	$ 2,672,285	$ 2,537,580
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	592,644	556,476	1,164,270	1,103,098
Selling, general and administrative	311,805	295,394	606,325	576,117
Depreciation and amortization	195,367	178,254	377,461	361,869
Acquisition and Integration Costs	1,511	16,878	3,106	32,539
Restructuring and other transformation	45,588	0	82,501	0
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(1,505)	(51,249)	(14,566)	(51,954)
Total Operating Expenses	1,145,410	995,753	2,219,097	2,021,669
Operating Income (Loss)	212,526	293,781	453,188	515,911
Interest Expense, Net (includes Interest Income of $2,290 and $2,171 for the three months ended June 30, 2023 and 2022, respectively)	144,178	115,057	281,347	229,499
Other Expense (Income), Net	62,950	(41,217)	84,150	14,684
Net Income (Loss) Before Provision (Benefit) for Income Taxes	5,398	219,941	87,691	271,728
Provision (Benefit) for Income Taxes	4,255	18,083	21,013	28,163
Net Income (Loss)	1,143	201,858	66,678	243,565
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,029	1,777	1,969	1,185
Net Income (Loss) Attributable to Iron Mountain Incorporated	$ 114	$ 200,081	$ 64,709	$ 242,380
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic (in dollars per share)	$ 0.00	$ 0.69	$ 0.22	$ 0.83
Diluted (in dollars per share)	$ 0.00	$ 0.68	$ 0.22	$ 0.83
Weighted average common shares outstanding-basic (in shares)	291,825,000	290,756,000	291,633,000	290,542,000
Weighted average common shares outstanding-diluted (in shares)	293,527,000	292,487,234	293,288,000	292,166,419
Storage Rental
Revenues:
Total Revenues	$ 830,756	$ 753,126	$ 1,640,845	$ 1,504,196
Service
Revenues:
Total Revenues	$ 527,180	$ 536,408	$ 1,031,440	$ 1,033,384

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Interest income	$ 2,290	$ 2,171	$ 5,197	$ 3,819

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 1,143	$ 201,858	$ 66,678	$ 243,565
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	18,035	(187,786)	58,261	(160,333)
Change in Fair Value of Derivative Instruments	7,896	34,211	4,454	50,977
Reclassifications from Accumulated Other Comprehensive Items, net	(2,527)	0	(2,527)	0
Total Other Comprehensive Income (Loss):	23,404	(153,575)	60,188	(109,356)
Comprehensive Income (Loss)	24,547	48,283	126,866	134,209
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	909	819	2,398	457
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 23,638	$ 47,464	$ 124,468	$ 133,752

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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	(DISTRIBUTIONS IN EXCESS OF EARNINGS) EARNINGS IN EXCESS OF DISTRIBUTIONS	ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET	NONCONTROLLING INTERESTS	REDEEMABLE NONCONTROLLING INTERESTS
Beginning of Period at Dec. 31, 2021	$ 857,068	$ 2,898	$ 4,412,553	$ (3,221,152)	$ (338,347)	$ 1,116
Beginning balance (in shares) at Dec. 31, 2021		289,757,061
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	22,960	$ 9	22,951
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		922,897
Changes in equity related to noncontrolling interests	2,626		(1,009)			3,635	$ 1,009
Parent cash dividends declared	(362,220)			(362,220)
Other comprehensive income (loss)	(108,787)				(108,628)	(159)
Net Income (Loss)	242,614			242,380		234
Noncontrolling interests equity contributions and related costs	(2,486)		(2,486)
Noncontrolling interests dividends							(1,392)
End of period at Jun. 30, 2022	651,775	$ 2,907	4,432,009	(3,340,992)	(446,975)	4,826
Ending balance (in shares) at Jun. 30, 2022		290,679,958
Beginning of redeemable noncontrolling interest at Dec. 31, 2021							72,411
Increase (Decrease) in Temporary Equity [Roll Forward]
Other comprehensive income (loss)							(569)
Net income (loss)							951
Noncontrolling interests equity contributions and related costs							21,547
Noncontrolling interests dividends							(1,392)
Ending of redeemable noncontrolling interest at Jun. 30, 2022							93,957
Beginning of Period at Mar. 31, 2022	758,771	$ 2,906	4,409,051	(3,359,876)	(294,358)	1,048
Beginning balance (in shares) at Mar. 31, 2022		290,550,440
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	24,462	$ 1	24,461
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		129,518
Changes in equity related to noncontrolling interests	4,618		983			3,635	(983)
Parent cash dividends declared	(181,197)			(181,197)
Other comprehensive income (loss)	(152,708)				(152,617)	(91)
Net Income (Loss)	200,315			200,081		234
Noncontrolling interests equity contributions and related costs	(2,486)		(2,486)
Noncontrolling interests dividends							(711)
End of period at Jun. 30, 2022	651,775	$ 2,907	4,432,009	(3,340,992)	(446,975)	4,826
Ending balance (in shares) at Jun. 30, 2022		290,679,958
Beginning of redeemable noncontrolling interest at Mar. 31, 2022							73,428
Increase (Decrease) in Temporary Equity [Roll Forward]
Other comprehensive income (loss)							(867)
Net income (loss)							1,543
Noncontrolling interests equity contributions and related costs							21,547
Noncontrolling interests dividends							(711)
Ending of redeemable noncontrolling interest at Jun. 30, 2022							93,957
Beginning of Period at Dec. 31, 2022	$ 636,793	$ 2,908	4,468,035	(3,392,272)	(442,003)	125
Beginning balance (in shares) at Dec. 31, 2022	290,830,296	290,830,296
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	$ 19,100	$ 10	19,090
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		994,662
Changes in equity related to noncontrolling interests	1,367		1,367				(1,367)
Parent cash dividends declared	(365,385)			(365,385)
Other comprehensive income (loss)	59,759				59,759	0
Net Income (Loss)	64,709			64,709
Noncontrolling interests dividends							(2,032)
End of period at Jun. 30, 2023	$ 416,343	$ 2,918	4,488,492	(3,692,948)	(382,244)	125
Ending balance (in shares) at Jun. 30, 2023	291,824,958	291,824,958
Beginning of redeemable noncontrolling interest at Dec. 31, 2022	$ 95,160						95,160
Increase (Decrease) in Temporary Equity [Roll Forward]
Other comprehensive income (loss)							429
Net income (loss)							1,969
Noncontrolling interests equity contributions and related costs							9,900
Noncontrolling interests dividends							(2,032)
Ending of redeemable noncontrolling interest at Jun. 30, 2023	104,059						104,059
Beginning of Period at Mar. 31, 2023	545,589	$ 2,916	4,459,265	(3,510,949)	(405,768)	125
Beginning balance (in shares) at Mar. 31, 2023		291,584,999
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation	27,862	$ 2	27,860
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		239,959
Changes in equity related to noncontrolling interests	1,367		1,367				(1,367)
Parent cash dividends declared	(182,113)			(182,113)
Other comprehensive income (loss)	23,524				23,524
Net Income (Loss)	114			114
Noncontrolling interests dividends							(1,013)
End of period at Jun. 30, 2023	$ 416,343	$ 2,918	$ 4,488,492	$ (3,692,948)	$ (382,244)	$ 125
Ending balance (in shares) at Jun. 30, 2023	291,824,958	291,824,958
Beginning of redeemable noncontrolling interest at Mar. 31, 2023							95,630
Increase (Decrease) in Temporary Equity [Roll Forward]
Other comprehensive income (loss)							(120)
Net income (loss)							1,029
Noncontrolling interests equity contributions and related costs							9,900
Noncontrolling interests dividends							(1,013)
Ending of redeemable noncontrolling interest at Jun. 30, 2023	$ 104,059						$ 104,059

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows from Operating Activities:
Net income (loss)	$ 66,678	$ 243,565
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation	254,395	236,496
Amortization (includes amortization of deferred financing costs and discounts of $8,095 and $9,064 for the six months ended June 30, 2023 and 2022, respectively)	131,161	134,437
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	3,491	3,681
Stock-based compensation expense	34,882	31,597
Provision (benefit) for deferred income taxes	2,799	(18,491)
Loss on early extinguishment of debt	0	671
(Gain) loss on disposal/write-down of property, plant and equipment, net	(14,566)	(51,954)
Loss (gain) on divestments and deconsolidations	0	105,825
Loss (gain) associated with the Clutter transactions	38,000
Loss (gain) on divestments and deconsolidations		(35,821)
Foreign currency transactions and other, net	69,183	(58,821)
(Increase) decrease in assets	(31,071)	(194,756)
(Decrease) increase in liabilities	(108,858)	(50,505)
Cash Flows from Operating Activities	446,094	345,924
Cash Flows from Investing Activities:
Capital expenditures	(600,758)	(330,220)
Cash paid for acquisitions, net of cash acquired	(21,465)	(718,657)
Acquisition of customer relationships	0	(148)
Customer inducements	(2,630)	(4,624)
Contract fulfillment costs	(39,989)	(33,951)
Investments in joint ventures and other investments	(15,830)	0
Proceeds from sales of property and equipment and other, net	35,390	96,497
Cash Flows from Investing Activities	(645,282)	(991,103)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(10,087,033)	(5,351,720)
Proceeds from revolving credit facility, term loan facilities and other debt	9,683,880	6,255,829
Net proceeds from sale of senior note	990,000	0
Debt financing and equity contribution from noncontrolling interests	9,900	21,547
Debt repayment and equity distribution to noncontrolling interests	(2,032)	(1,392)
Parent cash dividends	(367,060)	(364,223)
Net (payments) proceeds associated with employee stock-based awards	(15,782)	(8,636)
Other, net	(2,046)	(9,405)
Cash Flows from Financing Activities	209,827	542,000
Effect of Exchange Rates on Cash and Cash Equivalents	(2,943)	(7,903)
Increase (decrease) in Cash and Cash Equivalents	7,696	(111,082)
Cash and Cash Equivalents, Beginning of Period	141,797	255,828
Cash and Cash Equivalents, End of Period	149,493	144,746
Supplemental Information:
Cash Paid for Interest	270,146	227,633
Cash Paid for Income Taxes, Net	46,502	57,135
Non-Cash Investing and Financing Activities:
Financing Leases and Other	61,085	12,878
Accrued Capital Expenditures	192,197	98,210
Deferred Purchase Obligations and Other Deferred Payments	9,290	276,017
Dividends Payable	$ 192,597	$ 188,556

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Statement of Cash Flows [Abstract]
Deferred financing costs and discount included in amortization	$ 8,095	$ 9,064

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General

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

GENERAL

The unaudited condensed consolidated financial statements of Iron Mountain Incorporated, a Delaware corporation ("IMI"), and its subsidiaries ("we" or "us"), have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been omitted pursuant to those rules and regulations, but we believe that the disclosures included herein are adequate to make the information presented not misleading. Certain prior year financial statement amounts have been reclassified to conform to the current year presentation. The interim condensed consolidated financial statements are presented herein and, in the opinion of management, reflect all adjustments of a normal recurring nature necessary for a fair presentation. Interim results are not necessarily indicative of results for a full year.

The Condensed Consolidated Financial Statements and Notes thereto, which are included herein, should be read in conjunction with the Consolidated Financial Statements and Notes thereto for the year ended December 31, 2022 included in our Annual Report on Form 10-K filed with the SEC on February 23, 2023 (our "Annual Report").

In September 2022, we announced a global program designed to accelerate the growth of our business ("Project Matterhorn"). See Note 11.

We have been organized and have operated as a real estate investment trust for United States federal income tax purposes ("REIT") beginning with our taxable year ended December 31, 2014.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2023

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A. CASH AND CASH EQUIVALENTS

Cash and cash equivalents include cash on hand and cash invested in highly liquid short-term securities, which have remaining maturities at the date of purchase of less than 90 days. Cash and cash equivalents are carried at cost, which approximates fair value.

B. ACCOUNTS RECEIVABLE

We maintain an allowance for doubtful accounts and a credit memo reserve for estimated losses resulting from the potential inability of our customers to make required payments and potential disputes regarding billing and service issues. The rollforward of the allowance for doubtful accounts and credit memo reserves for the six months ended June 30, 2023 is as follows:

Balance as of December 31, 2022	$	54,143
Credit memos charged to revenue	46,222
Allowance for bad debts charged to expense	16,172
Deductions and other(1)	(51,320)
Balance as of June 30, 2023	$	65,217

(1)Primarily consists of the issuance of credit memos, the write-off of accounts receivable and the impact associated with currency translation adjustments.

C. LEASES

We lease facilities for certain warehouses, data centers and office space. We also have land leases, including those on which certain facilities are located.

Operating and financing lease right-of-use assets and lease liabilities as of June 30, 2023 and December 31, 2022 are as follows:

DESCRIPTION	JUNE 30, 2023		DECEMBER 31, 2022
Assets:
Operating lease right-of-use assets	$	2,671,371	$	2,583,704
Financing lease right-of-use assets, net of accumulated depreciation(1)	255,015		251,690
Liabilities:
Current
Operating lease liabilities	$	303,615	$	288,738
Financing lease liabilities(1)	49,148		43,857
Long-term
Operating lease liabilities	$	2,513,975	$	2,429,167
Financing lease liabilities(1)	297,190		289,048

(1)Financing lease right-of-use assets, current financing lease liabilities and long-term financing lease liabilities are included within Property, Plant and Equipment, Net, Current portion of long-term debt and Long-term Debt, net of current portion, respectively, within our Condensed Consolidated Balance Sheets.

The components of the lease expense for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DESCRIPTION	2023		2022		2023		2022
Operating lease cost(1)	$	161,241	$	139,863	$	317,114	$	283,393
Financing lease cost:
Depreciation of financing lease right-of-use assets	$	10,202	$	10,578	$	20,210	$	22,032
Interest expense for financing lease liabilities	4,416		4,359		8,757		9,037

(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $34,418 and $65,998 for the three and six months ended June 30, 2023, respectively, and $28,788 and $59,296 for the three and six months ended June 30, 2022, respectively.

Other information: Supplemental cash flow information relating to our leases for the six months ended June 30, 2023 and 2022 is as follows:

	SIX MONTHS ENDED JUNE 30,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:	2023		2022
Operating cash flows used in operating leases	$	220,764	$	200,958
Operating cash flows used in financing leases (interest)	8,757		9,037
Financing cash flows used in financing leases	22,010		20,084
NON-CASH ITEMS:
Operating lease modifications and reassessments	$	44,779	$	67,699
New operating leases (including acquisitions and sale-leaseback transactions)	163,326		382,890

In addition to the leases signed but not yet commenced that were disclosed in Note 2.j. to Notes to Consolidated Financial Statements included in our Annual Report, we entered into an operating lease in March 2023 that is expected to commence in July 2024, with an initial lease term of 25 years. The total undiscounted minimum lease payments for this lease are approximately $170,100.

D. GOODWILL

Our reporting units as of December 31, 2022 are described in detail in Note 2.l. to Notes to Consolidated Financial Statements included in our Annual Report.

The changes in the carrying value of goodwill attributable to each reportable segment for the six months ended June 30, 2023 are as follows:

	GLOBAL RIM BUSINESS		GLOBAL DATA CENTER BUSINESS		CORPORATE AND OTHER		TOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization as of December 31, 2022	$	3,852,946	$	418,502	$	611,286	$	4,882,734
Non-tax deductible goodwill acquired during the period	22,876		—		383		23,259
Fair value and other adjustments	(80)		—		2,333		2,253
Currency translation adjustments	17,169		2,153		577		19,899
Goodwill balance, net of accumulated amortization as of June 30, 2023	$	3,892,911	$	420,655	$	614,579	$	4,928,145
Accumulated goodwill impairment balance as of June 30, 2023	$	132,409	$	—	$	26,011	$	158,420

E. FAIR VALUE MEASUREMENTS

The assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2023 and December 31, 2022 are as follows:

			FAIR VALUE MEASUREMENTS AT JUNE 30, 2023 USING
DESCRIPTION	TOTAL CARRYING VALUE AT JUNE 30, 2023		QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)		SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)		SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds	$	11,761	$	—	$	11,761	$	—
Time Deposits	1,127		—		1,127		—
Trading Securities	10,340		10,322		18		—
Derivative Assets	28,286		—		28,286		—
Derivative Liabilities	4,540		—		4,540		—
Deferred Purchase Obligations(1)	201,190		—		—		201,190

			FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2022 USING
DESCRIPTION	TOTAL CARRYING VALUE AT DECEMBER 31, 2022		QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)		SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)		SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds	$	11,311	$	—	$	11,311	$	—
Time Deposits	1,102		—		1,102		—
Trading Securities	9,462		9,426		36		—
Derivative Assets	51,396		—		51,396		—
Derivative Liabilities	489		—		489		—
Deferred Purchase Obligations(1)	193,033		—		—		193,033

(1)Primarily relates to the fair value of the Deferred Purchase Obligation (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) associated with the ITRenew Transaction (as defined below in Note 3), which was determined utilizing a Monte-Carlo model and takes into account our forecasted projections as it relates to the underlying performance of the business. The Monte-Carlo simulation model incorporates assumptions as to expected gross profits over the applicable achievement period, including adjustments for the volatility of timing and amount of the associated revenue and costs, as well as discount rates that account for the risk of the underlying arrangement and overall market risks. Any material change to these assumptions may result in a significantly higher or lower fair value of the Deferred Purchase Obligation. The change in value of the Deferred Purchase Obligation during the three and six months ended June 30, 2023 was driven by the accretion of the obligation to present value.

There were no material items that were measured at fair value on a non-recurring basis at June 30, 2023 and December 31, 2022 other than (i) those disclosed in Note 2.p. to Notes to Consolidated Financial Statements included in our Annual Report and (ii) assets acquired and liabilities assumed through our acquisitions that occurred during the six months ended June 30, 2023, all of which are based on Level 3 inputs.

F. ACCUMULATED OTHER COMPREHENSIVE ITEMS, NET

The changes in Accumulated other comprehensive items, net for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30, 2023						THREE MONTHS ENDED JUNE 30, 2022
	FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL		FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL
Beginning of Period	$	(414,832)	$	9,064	$	(405,768)	$	(313,801)	$	19,443	$	(294,358)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	18,155		—		18,155		(186,828)		—		(186,828)
Change in fair value of derivative instruments	—		7,896		7,896		—		34,211		34,211
Reclassifications from accumulated other comprehensive items, net	—		(2,527)		(2,527)		—		—		—
Total other comprehensive income (loss)	18,155		5,369		23,524		(186,828)		34,211		(152,617)
End of Period	$	(396,677)	$	14,433	$	(382,244)	$	(500,629)	$	53,654	$	(446,975)

	SIX MONTHS ENDED JUNE 30, 2023						SIX MONTHS ENDED JUNE 30, 2022
	FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL		FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL
Beginning of Period	$	(454,509)	$	12,506	$	(442,003)	$	(341,024)	$	2,677	$	(338,347)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	57,832		—		57,832		(159,605)		—		(159,605)
Change in fair value of derivative instruments	—		4,454		4,454		—		50,977		50,977
Reclassifications from accumulated other comprehensive items, net	—		(2,527)		(2,527)		—		—		—
Total other comprehensive income (loss)	57,832		1,927		59,759		(159,605)		50,977		(108,628)
End of Period	$	(396,677)	$	14,433	$	(382,244)	$	(500,629)	$	53,654	$	(446,975)

G. REVENUES

The costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to obtain or fulfill customer contracts (collectively, "Contract Fulfillment Costs"). Contract Fulfillment Costs as of June 30, 2023 and December 31, 2022 are as follows:

	JUNE 30, 2023						DECEMBER 31, 2022
	GROSS CARRYING AMOUNT		ACCUMULATED AMORTIZATION		NET CARRYING AMOUNT		GROSS CARRYING AMOUNT		ACCUMULATED AMORTIZATION		NET CARRYING AMOUNT
Intake Costs asset	$	75,428	$	(47,919)	$	27,509	$	68,345	$	(42,132)	$	26,213
Commissions asset	148,003		(66,431)		81,572		133,145		(58,949)		74,196

Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows:

DESCRIPTION	LOCATION IN BALANCE SHEET	JUNE 30, 2023		DECEMBER 31, 2022
Deferred revenue - Current	Deferred revenue	$	336,068	$	328,910
Deferred revenue - Long-term	Other Long-term Liabilities	22,343		32,960

DATA CENTER LESSOR CONSIDERATIONS

Our Global Data Center Business features storage rental provided to customers at contractually specified rates over a fixed contractual period, which are accounted for in accordance with Accounting Standards Codification ("ASC") 842, Leases. Storage rental revenue, including revenue associated with power and connectivity, associated with our Global Data Center Business for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Storage rental revenue(1)	$	110,990	$	89,768	$	218,425	$	177,219

(1)Revenue associated with power and connectivity included within storage rental revenue was $38,692 and $79,364 for the three and six months ended June 30, 2023, respectively

H. STOCK-BASED COMPENSATION

Our stock-based compensation expense includes the cost of stock options, restricted stock units ("RSUs") and performance units ("PUs") (together, the "Employee Stock-Based Awards").

STOCK-BASED COMPENSATION EXPENSE

Stock-based compensation expense for the Employee Stock-Based Awards for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Stock-based compensation expense	$	22,373	$	20,256	$	34,882	$	31,597

As of June 30, 2023, unrecognized compensation cost related to the unvested portion of our Employee Stock-Based Awards is $87,880.

I. ACQUISITION AND INTEGRATION COSTS

Acquisition and integration costs represent operating expenditures directly associated with the closing and integration activities of our business acquisitions that have closed, or are highly probable of closing, and include (i) advisory, legal and professional fees to complete business acquisitions and (ii) costs to integrate acquired businesses into our existing operations, including move, severance and system integration costs (collectively, "Acquisition and Integration Costs").

Acquisition and Integration Costs for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Acquisition and Integration Costs	$	1,511	$	16,878	$	3,106	$	32,539

J. (GAIN) LOSS ON DISPOSAL/WRITE-DOWN OF PROPERTY, PLANT AND EQUIPMENT, NET

(Gain) loss on disposal/write-down of property, plant and equipment, net for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022(2)		2023(1)		2022(2)
(Gain) Loss on disposal/write-down of property, plant and equipment, net(3)	$	(1,505)	$	(51,249)	$	(14,566)	$	(51,954)

(1)    The gains for the six months ended June 30, 2023 primarily consist of a gain of approximately $18,500 associated with a sale-leaseback transaction of a facility in Singapore during the first quarter of 2023.

(2)    The gains for the three and six months ended June 30, 2022 primarily consist of gains of approximately $49,000 associated with sale and sale-leaseback transactions of 11 facilities and parcels of land in the United States.

(3)    The gains recognized during both 2023 and 2022 are the result of our program to monetize a small portion of our industrial assets through sale and sale-leaseback transactions. The terms for these leases are consistent with the terms of our lease portfolio, which are disclosed in detail in Note 2.j. to Notes to Consolidated Financial Statements included in our Annual Report.

K. OTHER EXPENSE (INCOME), NET

Other expense (income), net for the three and six months ended June 30, 2023 and 2022 consists of the following:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DESCRIPTION	2023		2022		2023		2022
Foreign currency transaction losses (gains), net(1)(2)	$	15,063	$	(55,039)	$	29,487	$	(68,240)
Debt extinguishment expense	—		—		—		671
Other, net(3)(4)	47,887		13,822		54,663		82,253
Other Expense (Income), Net	$	62,950	$	(41,217)	$	84,150	$	14,684

(1)The losses for the three and six months ended June 30, 2023 primarily consist of the impact of changes in the exchange rate of the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(2)The gains for the three and six months ended June 30, 2022 primarily consist of the impact of changes in the exchange rate of the Euro and the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(3)Other, net for the six months ended June 30, 2023 consists primarily of a loss of approximately $38,000 associated with the remeasurement to fair value of our previously held equity interest in the Clutter JV (as defined and discussed in Note 4) as well as losses on our equity method investments and the change in value of the Deferred Purchase Obligation.

(4)Other, net for the six months ended June 30, 2022 consists primarily of (i) a loss of approximately $105,800 associated with the OSG Deconsolidation (as defined in Note 4 to Notes to Consolidated Financial Statements included in our Annual Report), partially offset by (ii) a gain of approximately $35,800 associated with the Clutter Transaction (as defined in Note 5 to Notes to Consolidated Financial Statements included in our Annual Report).

L. INCOME TAXES

We provide for income taxes during interim periods based on our estimate of the effective tax rate for the year. Our effective tax rates for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023(1)		2022(2)		2023(1)		2022(2)
Effective Tax Rate	78.8	%	8.2	%	24.0	%	10.4	%

(1)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2023 were (i) the loss of approximately $38,000 recorded in Other, net a component of Other expense (income), net during the second quarter of 2023 to reflect the remeasurement of our previously held equity interest in the Clutter JV to fair value, for which there was no tax impact, (ii) the benefits derived from the dividends paid deduction and (iii) the differences in the tax rates to which our foreign earnings are subject.

(2)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2022 were the benefits derived from the dividends paid deduction and the differences in the tax rates to which our foreign earnings are subject. In addition, there were gains and losses recorded in Other expense (income), net and Gain (loss) on disposal/write-down of property, plant and equipment net, during the period for which there was an insignificant tax impact. During the first quarter of 2022, there was also a release of valuation allowances on deferred tax assets of our U.S. taxable REIT subsidiaries of approximately $9,900 as a result of our acquisition of Intercept Parent, Inc. ("ITRenew").

M. INCOME (LOSS) PER SHARE—BASIC AND DILUTED

The calculations of basic and diluted income (loss) per share for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,029		1,777		1,969		1,185
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)	$	114	$	200,081	$	64,709	$	242,380
Weighted-average shares—basic	291,825,000		290,756,000		291,633,000		290,542,000
Effect of dilutive potential stock options	1,322,000		1,249,262		1,269,000		1,122,444
Effect of dilutive potential RSUs and PUs	380,000		481,972		386,000		501,975
Weighted-average shares—diluted	293,527,000		292,487,234		293,288,000		292,166,419
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic	$	0.00	$	0.69	$	0.22	$	0.83
Diluted	$	0.00	$	0.68	$	0.22	$	0.83
Antidilutive stock options, RSUs and PUs excluded from the calculation	157,132		234,085		151,431		494,833

N. RECENT ACCOUNTING PRONOUNCEMENTS

In December 2021, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers ("ASU 2021-08"). ASU 2021-08 requires that an entity recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with ASC 606, Revenue from Contracts with Customers, and for the related revenue contracts in accordance with ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), as if it had originated the contracts. We adopted ASU 2021-08 on January 1, 2023 on a prospective basis, and there was no material impact on our condensed consolidated financial statements.

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Acquisitions

6 Months Ended

Jun. 30, 2023

Business Combination and Asset Acquisition [Abstract]

Acquisitions

CLUTTER

On June 29, 2023, in order to further expand our on-demand consumer storage business, we acquired 100% of the outstanding shares of Clutter Intermediate, Inc. and control of all assets of the Clutter JV (collectively, "Clutter") for total consideration of $59,100 (the “Clutter Acquisition”). During the third quarter of 2023, we anticipate offering up to 15% equity interest in Clutter to certain former stakeholders of the Clutter JV.

PRELIMINARY PURCHASE PRICE ALLOCATION

A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for all of our acquisitions closed during the six months ended June 30, 2023 is as follows:

	SIX MONTHS ENDED JUNE 30, 2023
Cash Paid (gross of cash acquired)(1)	$	21,215
Deferred Purchase Obligation, Purchase Price Holdbacks and Other	9,290
Fair Value of Previously Held Equity Interest	9,000
Settlement of Pre-Existing Relationships	20,122
Total Consideration	59,627
Fair Value of Identifiable Assets Acquired	56,248
Fair Value of Identifiable Liabilities Assumed	(19,880)
Total Fair Value of Identifiable Net Assets Acquired	36,368
Goodwill Initially Recorded(2)	$	23,259

(1)Cash paid for acquisitions, net in our Condensed Consolidated Statement of Cash Flows includes (i) cash acquired of $1,980 relating to acquisitions completed during the six months ended June 30, 2023 and (ii) contingent and other payments of $2,230 for the six months ended June 30, 2023 relating to acquisitions completed prior to January 1, 2023.

(2)Goodwill is primarily attributable to the assembled workforce, expanded market opportunities and costs and other operating synergies anticipated upon the integration of the operations of us and the acquired businesses.

The preliminary purchase price allocations that are not finalized as of June 30, 2023 relate to the final assessment of the fair values of property, plant and equipment and intangible assets (primarily the customer relationship intangible asset) associated with the acquisitions we closed during the six months ended June 30, 2023. Any adjustments to our estimates of purchase price allocations will be made in the periods in which the adjustments are determined, but no later than the one year measurement period, and the cumulative effect of such adjustments will be calculated as if the adjustments had been completed as of the applicable acquisition date. Adjustments recorded during the six months ended June 30, 2023 were not material to our results from operations.

ITRENEW PRO FORMA FINANCIAL INFORMATION

On January 25, 2022, in order to expand our asset lifecycle management operations, we acquired an approximately 80% interest in ITRenew at an agreed upon purchase price of $725,000, subject to certain working capital adjustments at, and subsequent to, the closing (the "ITRenew Transaction"). The unaudited consolidated pro forma financial information (the "Pro Forma Financial Information") below summarizes the combined results of Iron Mountain and ITRenew on a pro forma basis as if the ITRenew Transaction had occurred on January 1, 2021. The Pro Forma Financial Information is presented for informational purposes and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place on January 1, 2021. The Pro Forma Financial Information, for the periods presented, includes purchase accounting adjustments (including amortization of acquired customer and supplier intangible assets and depreciation of acquired property, plant and equipment) and related tax effects. We and ITRenew collectively incurred $59,370 of operating expenditures to complete the ITRenew Transaction (including advisory and professional fees). These operating expenditures have been reflected within the results of operations in the Pro Forma Financial Information as if they were incurred on January 1, 2021.

	THREE MONTHS ENDED JUNE 30, 2022		SIX MONTHS ENDED JUNE 30, 2022
Total Revenues	$	1,289,534	$	2,555,554
Income from Continuing Operations	$	201,858	$	243,696

In addition to our acquisition of ITRenew, we completed certain other acquisitions in 2023 and 2022. The Pro Forma Financial Information does not reflect these acquisitions due to the insignificant impact of these acquisitions on our consolidated results of operations.

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Investments

6 Months Ended

Jun. 30, 2023

Investments, All Other Investments [Abstract]

Investments

4. INVESTMENTS

CLUTTER JOINT VENTURE

In February 2022, the joint venture formed by MakeSpace Labs, Inc. and us (the "MakeSpace JV") entered into an agreement with Clutter, Inc. pursuant to which the equityholders of the MakeSpace JV contributed their ownership interests in the MakeSpace JV, and Clutter, Inc.’s shareholders contributed their ownership interests in Clutter, Inc., to create a newly formed venture (the "Clutter JV"). In exchange for our 49.99% interest in the MakeSpace JV, we received an approximate 27% interest in the Clutter JV (the "Clutter Transaction"). As a result of the Clutter Transaction, we recognized a gain related to our contributed interest in the MakeSpace JV of approximately $35,800, which was recorded to Other, net, a component of Other expense (income), net, during the first quarter of 2022.

On June 29, 2023, we completed the Clutter Acquisition. In connection with the Clutter Acquisition, our previously held approximately 27% interest in the Clutter JV was remeasured to fair value at the closing date of the Clutter Acquisition. As a result, we recognized a loss of approximately $38,000 to Other, net, a component of Other expense (income), net, during the second quarter of 2023.

WEB WERKS JOINT VENTURE

In April 2021, we closed on an agreement to form a joint venture (the "Web Werks JV") with the shareholders of Web Werks India Private Limited, a colocation data center provider in India. Through December 31, 2022, we made two investments totaling approximately 7,500,000 Indian rupees (or approximately $96,200, based upon the exchange rates between the United States dollar and Indian rupee on the closing date of each investment) in exchange for a noncontrolling interest in the form of convertible preference shares in the Web Werks JV. On July 7, 2023, we made our final contractual investment in the Web Werks JV of approximately 3,750,000 Indian rupees (or approximately $45,300, based upon the exchange rate between the United States dollar and Indian rupee on the closing date of this investment). After the final contractual payment, our interest in the Web Werks JV increased to 63.39% and we assumed control of its board of directors. For financial reporting periods beginning after July 7, 2023, the Web Werks JV will be consolidated within our Global Data Center Business segment.

JOINT VENTURE SUMMARY

The following joint ventures are accounted for as equity method investments and are presented as a component of Other within Other assets, net in our Condensed Consolidated Balance Sheets. The carrying values and equity interests in our joint ventures at June 30, 2023 and December 31, 2022 are as follows:

	JUNE 30, 2023				DECEMBER 31, 2022
	CARRYING VALUE		EQUITY INTEREST		CARRYING VALUE		EQUITY INTEREST
Web Werks JV	$	98,650	53.58	%	$	98,278	53.58	%
Joint venture with AGC Equity Partners (the "Frankfurt JV")	59,394		20.00	%	37,194		20.00	%
Clutter JV	—		—	%	54,172		26.73	%

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Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Derivative instruments we are party to include: (i) interest rate swap agreements (which are designated as cash flow hedges) and (ii) cross-currency swap agreements (which are designated as net investment hedges).

INTEREST RATE SWAP AGREEMENTS DESIGNATED AS CASH FLOW HEDGES

In July 2019, we entered into forward-starting interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. These forward-starting interest rate swap agreements commenced in March 2022 with a total notional amount of $350,000 and provided variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month London Interbank Offered Rate ("LIBOR"), in exchange for the payment of fixed interest rates as specified in the respective interest rate swap agreements. In April 2023, we terminated these agreements in anticipation of the discontinuance of the LIBOR reference rate on June 30, 2023. The terminated swap agreements had associated unrealized gains at the termination date of approximately $10,100. These gains are included in Accumulated other comprehensive items, net and will be reclassified into earnings as reductions to interest expense from the date of termination through March 2024, the original maturity date of the swaps.

In April 2023, we entered into interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. Under these interest rate swap agreements, we receive variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month Secured Overnight Financing Rate, in exchange for the payment of fixed interest rates as specified in the interest rate swap agreements. As of June 30, 2023, we have $350,000 in notional value outstanding associated with these interest rate swap agreements, which expire in February 2026.

In November 2022, we entered into a forward-starting interest rate swap agreement to limit our exposure to changes in interest rates on future borrowings under our Virginia Credit Agreement (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report). This forward-starting interest rate swap agreement commenced in July 2023 and expires in October 2025. As of both June 30, 2023 and December 31, 2022, we have $4,800 in notional value outstanding on this forward-starting interest rate swap agreement.

We have designated each of the interest rate swap agreements described above as cash flow hedges. These interest rate swap agreements are marked to market at the end of each reporting period, representing the fair values of the interest rate swap agreements, and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets, while unrealized losses are recognized as liabilities.

CROSS-CURRENCY SWAP AGREEMENTS DESIGNATED AS A HEDGE OF NET INVESTMENT

We utilize cross-currency interest rate swaps to hedge the variability of exchange rate impacts between the United States dollar and the Euro. As of both June 30, 2023 and December 31, 2022, we have approximately $469,200 in notional value outstanding on cross-currency interest rate swaps, with maturity dates ranging from August 2023 through February 2026.

We have designated these cross-currency swap agreements as hedges of net investments in certain of our Euro denominated subsidiaries and they require an exchange of the notional amounts at maturity. These cross-currency swap agreements are marked to market at the end of each reporting period, representing the fair values of the cross-currency swap agreements, and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets while unrealized losses are recognized as liabilities. The excluded component of our cross-currency swap agreements is recorded in Accumulated other comprehensive items, net and amortized to interest expense on a straight-line basis.

The fair value of derivative instruments recognized in our Condensed Consolidated Balance Sheets at June 30, 2023 and December 31, 2022, by derivative instrument, are as follows:

	JUNE 30, 2023				DECEMBER 31, 2022
DERIVATIVE INSTRUMENTS(1)	Assets		Liabilities		Assets		Liabilities
Cash Flow Hedges(2)
Interest rate swap agreements	$	6,852	$	—	$	12,995	$	489
Net Investment Hedges(3)
Cross-currency swap agreements	21,434		4,540		38,401		—

(1)Our derivative assets are included as a component of (i) Prepaid expenses and other or (ii) Other within Other assets, net and our derivative liabilities are included as a component of (i) Accrued expenses and other current liabilities or (ii) Other long-term liabilities in our Condensed Consolidated Balance Sheets. As of June 30, 2023, $1,459 is included within Prepaid expenses and other, $26,827 is included within Other assets and $4,540 is included within Accrued expense and other current liabilities. As of December 31, 2022, $2,606 is included within Prepaid expenses and other, $48,790 is included within Other assets and $489 is included within Other long-term liabilities.

(2)As of June 30, 2023, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our interest rate swap agreements are $14,433, which include $7,581 related to our terminated interest rate swap agreements.

(3)As of June 30, 2023, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our cross-currency swap agreements are $37,645, which include $20,751 related to the excluded component of our cross-currency swap agreements.

Unrealized gains (losses) recognized in Accumulated other comprehensive income during the three and six months ended June 30, 2023 and 2022, by derivative instrument, are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DERIVATIVE INSTRUMENTS	2023		2022		2023		2022
Cash Flow Hedges
Interest rate swap agreements	$	7,896	$	3,932	$	4,454	$	15,402
Net Investment Hedges
Cross-currency swap agreements	(12,704)		30,279		(21,507)		35,575
Cross-currency swap agreements (excluded component)	5,817		—		11,651		—

Gains (losses) recognized in Net income during the three and six months ended June 30, 2023 and 2022, by derivative instrument, are as follows:

		THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DERIVATIVE INSTRUMENTS	Location of gain (loss)	2023		2022		2023		2022
Cash Flow Hedges
Interest rate swap agreements	Interest expense	$	2,527	$	—	$	2,527	$	—
Net Investment Hedges
Cross-currency swap agreements (excluded component)	Interest expense	(5,817)		—		(11,651)		—

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Debt

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Debt

Long-term debt is as follows:

	JUNE 30, 2023								DECEMBER 31, 2022
	DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT		FAIR VALUE		DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT		FAIR VALUE
Revolving Credit Facility(1)	$	679,500	$	(5,332)	$	674,168	$	679,500	$	1,072,200	$	(6,790)	$	1,065,410	$	1,072,200
Term Loan A(1)	234,375		—		234,375		234,375		240,625		—		240,625		240,625
Term Loan B(1)	662,685		(3,122)		659,563		663,250		666,073		(3,747)		662,326		666,750
Australian Dollar Term Loan	196,333		(543)		195,790		198,005		202,641		(633)		202,008		204,623
UK Bilateral Revolving Credit Facility	177,277		—		177,277		177,277		169,361		—		169,361		169,361
37/8% GBP Senior Notes due 2025 (the "GBP Notes")	506,506		(2,231)		504,275		472,474		483,888		(2,589)		481,299		445,206
47/8% Senior Notes due 2027 (the "47/8% Notes due 2027")(2)	1,000,000		(6,043)		993,957		932,500		1,000,000		(6,754)		993,246		917,500
51/4% Senior Notes due 2028 (the "51/4% Notes due 2028")(2)	825,000		(5,609)		819,391		770,344		825,000		(6,200)		818,800		754,875
5% Senior Notes due 2028 (the "5% Notes due 2028")(2)	500,000		(3,678)		496,322		461,250		500,000		(4,039)		495,961		450,000
7% Senior Notes due 2029 (the "7% Notes due 2029")(2)	1,000,000		(11,853)		988,147		992,500		—		—		—		—
47/8% Senior Notes due 2029 (the "47/8% Notes due 2029")(2)	1,000,000		(9,041)		990,959		892,500		1,000,000		(9,764)		990,236		865,000
51/4% Senior Notes due 2030 (the "51/4% Notes due 2030")(2)	1,300,000		(10,655)		1,289,345		1,166,750		1,300,000		(11,407)		1,288,593		1,111,500
41/2% Senior Notes due 2031 (the "41/2% Notes")(2)	1,100,000		(9,539)		1,090,461		940,500		1,100,000		(10,161)		1,089,839		891,000
5% Senior Notes due 2032 (the "5% Notes due 2032")	750,000		(11,858)		738,142		645,000		750,000		(12,511)		737,489		622,500
55/8% Senior Notes due 2032 (the "55/8% Notes")(2)	600,000		(5,275)		594,725		535,500		600,000		(5,566)		594,434		520,500
Real Estate Mortgages, Financing Lease Liabilities and Other	457,724		(483)		457,241		457,724		425,777		(578)		425,199		425,777
Accounts Receivable Securitization Program	343,100		(426)		342,674		343,100		314,700		(531)		314,169		314,700
Total Long-term Debt	11,332,500		(85,688)		11,246,812				10,650,265		(81,270)		10,568,995
Less Current Portion	(102,582)		—		(102,582)				(87,546)		—		(87,546)
Long-term Debt, Net of Current Portion	$	11,229,918	$	(85,688)	$	11,144,230			$	10,562,719	$	(81,270)	$	10,481,449

(1)Collectively, the “Credit Agreement”. The Credit Agreement consists of a revolving credit facility (the “Revolving Credit Facility”), a term loan A (the “Term Loan A”) and a term loan B (the "Term Loan B"). The Revolving Credit Facility and the Term Loan A are scheduled to mature on March 18, 2027. The Term Loan B is scheduled to mature on January 2, 2026. The remaining amount available for borrowing under the Revolving Credit Facility as of June 30, 2023 was $1,566,061 (which amount represents the maximum availability as of such date). The weighted average interest rate in effect under the Revolving Credit Facility was 7.0% and 6.2% as of June 30, 2023 and December 31, 2022, respectively.

(2)Collectively, the "Parent Notes". IMI is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI’s United States subsidiaries that represent the substantial majority of our United States operations (the "Note Guarantors"). These guarantees are joint and several obligations of the Note Guarantors. The remainder of our subsidiaries do not guarantee the Parent Notes.

See Note 7 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding our long-term debt, including the direct obligors of each of our debt instruments as well as information regarding the fair value of our debt instruments (including the levels of the fair value hierarchy used to determine the fair value of our debt instruments). The levels of the fair value hierarchy used to determine the fair value of our debt as of June 30, 2023 are consistent with the levels of the fair value hierarchy used to determine the fair value of our debt as of December 31, 2022 (which are disclosed in our Annual Report).

MAY 2023 OFFERING

On May 15, 2023, IMI completed a private offering of:

SERIES OF NOTES	AGGREGATE PRINCIPAL AMOUNT		MATURITY DATE	INTEREST PAYMENT DUE	PAR CALL DATE(1)
7% Notes due 2029	$	1,000,000	February 15, 2029	February 15 and August 15	August 15, 2025

(1)We may redeem the 7% Notes due 2029 at any time, at our option, in whole or in part. Prior to the par call date, we may redeem the 7% Notes due 2029 at the redemption price or make-whole premium specified in the indenture governing the 7% Notes due 2029, together with accrued and unpaid interest to, but excluding, the redemption date. On or after the par call date, we may redeem the 7% Notes due 2029 at a price equal to 100% of the principal amount being redeemed, together with accrued and unpaid interest to, but excluding, the redemption date.

The 7% Notes due 2029 were issued at 100% of par. The total net proceeds of approximately $990,000 from the issuance of the 7% Notes due 2029, after deducting the initial purchasers' commissions, were used to repay a portion of the outstanding borrowings under our Revolving Credit Facility.

ACCOUNTS RECEIVABLE SECURITIZATION PROGRAM On June 8, 2023, we amended the Accounts Receivable Securitization Program (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report) to increase the maximum borrowing capacity from $325,000 to $360,000. All other material terms of the Accounts Receivable Securitization Program remain the same as what was disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. MAXIMUM AMOUNT $360,000
OUTSTANDING BORROWING $343,100
INTEREST RATE 6.2% As of June 30, 2023

LETTERS OF CREDIT

As of June 30, 2023, we had outstanding letters of credit totaling $40,410, of which $4,439 reduce our borrowing capacity under the Revolving Credit Facility. The letters of credit expire at various dates between September 2023 and July 2025.

DEBT COVENANTS

The Credit Agreement, our bond indentures and other agreements governing our indebtedness contain certain restrictive financial and operating covenants, including covenants that restrict our ability to complete acquisitions, pay cash dividends, incur indebtedness, make investments, sell assets and take other specified corporate actions. The covenants do not contain a rating trigger. Therefore, a change in our debt rating would not trigger a default under the Credit Agreement, our bond indentures or other agreements governing our indebtedness. The Credit Agreement requires that we satisfy a net total lease adjusted leverage ratio and a fixed charge coverage ratio on a quarterly basis and our bond indentures require that, among other things, we satisfy a leverage ratio (not lease adjusted) or a fixed charge coverage ratio (not lease adjusted) as a condition to taking actions such as paying dividends and incurring indebtedness.

The Credit Agreement uses earnings before interest, taxes, depreciation and amortization and rent expense ("EBITDAR") based calculations and the bond indentures use earnings before interest, taxes, depreciation and amortization ("EBITDA") based calculations as the primary measures of financial performance for purposes of calculating leverage and fixed charge coverage ratios. The EBITDAR- and EBITDA-based leverage calculations include our consolidated subsidiaries, other than those we have designated as "Unrestricted Subsidiaries" as defined in the Credit Agreement and bond indentures. Generally, the Credit Agreement and the bond indentures use a trailing four fiscal quarter basis for purposes of the relevant calculations and require certain adjustments and exclusions for purposes of those calculations, which make the calculation of financial performance for purposes of those calculations under the Credit Agreement and bond indentures not directly comparable to Adjusted EBITDA as presented herein. We are in compliance with our leverage and fixed charge coverage ratios under the Credit Agreement, our bond indentures and other agreements governing our indebtedness as of June 30, 2023. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

We are involved in litigation from time to time in the ordinary course of business, including litigation arising from damage to customer assets in our facilities caused by fires and other natural disasters. While the outcome of litigation is inherently uncertain, we do not believe any current litigation will have a material adverse effect on our consolidated financial condition, results of operations or cash flows.

We have estimated a reasonably possible range for all loss contingencies and believe it is reasonably possible that we could incur aggregate losses in addition to amounts currently accrued for all matters up to an additional $18,000 over the next several years, of which certain amounts would be covered by insurance or indemnity arrangement.

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Stockholders' Equity Matters

6 Months Ended

Jun. 30, 2023

Equity [Abstract]

Stockholders' Equity Matters

STOCKHOLDERS' EQUITY MATTERS

In fiscal year 2022 and the six months ended June 30, 2023, our board of directors declared the following dividends:

DECLARATION DATE	DIVIDEND PER SHARE		RECORD DATE	TOTAL AMOUNT		PAYMENT DATE
February 24, 2022	$	0.6185	March 15, 2022	$	179,661	April 6, 2022
April 28, 2022	0.6185		June 15, 2022	179,781		July 6, 2022
August 4, 2022	0.6185		September 15, 2022	179,790		October 4, 2022
November 3, 2022	0.6185		December 15, 2022	179,866		January 5, 2023
February 23, 2023	0.6185		March 15, 2023	180,339		April 5, 2023
May 4, 2023	0.6185		June 15, 2023	180,493		July 6, 2023

On August 3, 2023, we declared a dividend to our stockholders of record as of September 15, 2023 of $0.65 per share, payable on October 5, 2023.

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Segment Information

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Segment Information

Our reportable segments as of December 31, 2022 are described in Note 11 to Notes to Consolidated Financial Statements included in our Annual Report and are as follows:

•Global RIM Business

•Global Data Center Business

•Corporate and Other

An analysis of our business segment information and reconciliation to the accompanying Condensed Consolidated Financial Statements for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Global RIM Business
Total Revenues	$	1,159,867	$	1,070,476	$	2,286,393	$	2,119,367
Adjusted EBITDA	499,062		469,368		976,846		918,163
Global Data Center Business
Total Revenues	$	118,033	$	100,088	$	230,338	$	197,075
Adjusted EBITDA	53,809		42,307		104,444		84,284
Corporate and Other
Total Revenues	$	80,036	$	118,970	$	155,554	$	221,138
Adjusted EBITDA	(77,213)		(56,969)		(144,824)		(116,747)
Total Consolidated
Total Revenues	$	1,357,936	$	1,289,534	$	2,672,285	$	2,537,580
Adjusted EBITDA	475,658		454,706		936,466		885,700

Adjusted EBITDA for each segment is defined as net income (loss) before interest expense, net, provision (benefit) for income taxes, depreciation and amortization (inclusive of our share of Adjusted EBITDA from our unconsolidated joint ventures), and excluding certain items we do not believe to be indicative of our core operating results, specifically:

EXCLUDED
•Acquisition and Integration Costs •Restructuring and other transformation •(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	•Other expense (income), net •Stock-based compensation expense

Internally, we use Adjusted EBITDA as the basis for evaluating the performance of, and allocating resources to, our operating segments.

A reconciliation of Net Income (Loss) to Adjusted EBITDA on a consolidated basis for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Add/(Deduct):
Interest expense, net	144,178		115,057		281,347		229,499
Provision (benefit) for income taxes	4,255		18,083		21,013		28,163
Depreciation and amortization	195,367		178,254		377,461		361,869
Acquisition and Integration Costs	1,511		16,878		3,106		32,539
Restructuring and other transformation	45,588		—		82,501		—
(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	(1,505)		(51,249)		(14,566)		(51,954)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	58,694		(46,103)		76,185		7,412
Stock-based compensation expense	22,373		20,256		34,882		31,597
Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures	4,054		1,672		7,859		3,010
Adjusted EBITDA	$	475,658	$	454,706	$	936,466	$	885,700

Information as to our revenues by product and service lines by segment for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Global RIM Business
Records Management(1)	$	898,634	$	818,993	$	1,766,622	$	1,621,546
Data Management(1)	130,251		124,394		259,845		258,050
Information Destruction(1)(2)	130,982		127,089		259,926		239,771
Data Center(1)	—		—		—		—
Global Data Center Business
Records Management(1)	$	—	$	—	$	—	$	—
Data Management(1)	—		—		—		—
Information Destruction(1)	—		—		—		—
Data Center(1)	118,033		100,088		230,338		197,075
Corporate and Other
Records Management(1)	$	37,409	$	36,141	$	71,757	$	68,039
Data Management(1)	—		—		—		—
Information Destruction(1)(3)	42,627		82,829		83,797		153,099
Data Center(1)	—		—		—		—
Total Consolidated
Records Management(1)	$	936,043	$	855,134	$	1,838,379	$	1,689,585
Data Management(1)	130,251		124,394		259,845		258,050
Information Destruction(1)(2)(3)	173,609		209,918		343,723		392,870
Data Center(1)	118,033		100,088		230,338		197,075

(1)Each of these offerings has a component of revenue that is storage rental related and a component that is service revenue, except for information destruction, which does not have a storage rental component.

(2)Includes secure shredding services.

(3)Includes product revenue from ITRenew.

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Related Parties

6 Months Ended

Jun. 30, 2023

Related Party Transactions [Abstract]

Related Parties

RELATED PARTIES

In October 2020, in connection with the formation of the Frankfurt JV, we entered into agreements whereby we earn various fees, including (i) special project revenue and (ii) property management and construction and development fees for services we are providing to the Frankfurt JV (the "Frankfurt JV Agreements").

In March 2019, in connection with the formation of the MakeSpace JV, we entered into a storage and service agreement with the MakeSpace JV to provide certain storage and related services to the MakeSpace JV (the "MakeSpace Agreement"). In February 2022, in connection with the formation of the Clutter JV, we terminated the MakeSpace Agreement and entered into a storage and service agreement with the Clutter JV to provide certain storage and related services to the Clutter JV (the "Clutter Agreement"). On June 29, 2023, we completed the Clutter Acquisition and terminated the Clutter Agreement.

Revenue recognized in the accompanying Condensed Consolidated Statements of Operations under these agreements for the three and six months ended June 30, 2023 and 2022 is as follows (approximately):

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Frankfurt JV Agreements(1)	$	800	$	5,700	$	1,700	$	12,800
MakeSpace Agreement and Clutter Agreement(2)	7,000		7,400		13,000		14,400

(1)Revenue associated with the Frankfurt JV Agreements is presented as a component of our Global Data Center Business segment.

(2)Revenue associated with the MakeSpace Agreement and the Clutter Agreement is presented as a component of our Global RIM Business segment.

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Restructuring And Other Transformation

6 Months Ended

Jun. 30, 2023

Restructuring and Related Activities [Abstract]

Restructuring And Other Transformation

RESTRUCTURING AND OTHER TRANSFORMATION

PROJECT MATTERHORN

In September 2022, we announced Project Matterhorn, a global program designed to accelerate the growth of our business. Project Matterhorn investments will focus on transforming our operating model to a global operating model. Project Matterhorn will focus on the formation of a solution-based sales approach that is designed to allow us to optimize our shared services and best practices to better serve our customers' needs. We will be investing to accelerate growth and to capture a greater share of the large, global addressable markets in which we operate. We expect to incur approximately $150,000 in costs annually related to Project Matterhorn from 2023 through 2025. Costs are comprised of (1) restructuring costs, which include (i) site consolidation and other related exit costs, (ii) employee severance costs and (iii) certain professional fees associated with these activities, and (2) other transformation costs, which include professional fees such as project management costs and costs for third party consultants who are assisting in the enablement of our growth initiatives. Total costs related to Project Matterhorn during the three and six months ended June 30, 2023 were $45,588 and $82,501, respectively, and are included in Restructuring and other transformation in our Condensed Consolidated Statement of Operations. There were no Restructuring and other transformation costs related to Project Matterhorn for the three and six months ended June 30, 2022.

Restructuring and other transformation related to Project Matterhorn included in the accompanying Condensed Consolidated Statement of Operations for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Restructuring	$	16,127	$	28,084	$	41,376
Other transformation	29,461		54,417		83,058
Restructuring and other transformation	$	45,588	$	82,501	$	124,434

Restructuring costs for Project Matterhorn, included as a component of Restructuring and other transformation in the accompanying Condensed Consolidated Statement of Operations, by segment for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Global RIM Business	$	15,000	$	24,525	$	37,608
Global Data Center Business	—		78		78
Corporate and Other	1,127		3,481		3,690
Total restructuring costs	$	16,127	$	28,084	$	41,376

Other transformation costs for Project Matterhorn, included as a component of Restructuring and other transformation in the accompanying Condensed Consolidated Statement of Operations, by segment for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Global RIM Business	$	4,958	$	8,443	$	12,344
Global Data Center Business	498		1,368		1,426
Corporate and Other	24,005		44,606		69,288
Total other transformation costs	$	29,461	$	54,417	$	83,058

Accrued restructuring costs and accrued other transformation costs included in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2023 were approximately $7,400 and $22,200, respectively.

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Insider Trading Arrangements	3 Months Ended	6 Months Ended
	Jun. 30, 2023 shares	Jun. 30, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false
Edward Greene [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On June 2, 2023, Mr. Edward Greene, our Executive Vice President, Chief Human Resources Officer, adopted a 10b5-1 trading plan to sell up to 4,851 shares of our common stock between September 5, 2023 and November 30, 2023.
Name	Mr. Edward Greene
Title	Executive Vice President, Chief Human Resources Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 2, 2023
Arrangement Duration	86 days
Aggregate Available	4,851	4,851
John Tomovcsik [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On June 16, 2023, Mr. John Tomovcsik, our Executive Vice President, Chief Operating Officer, terminated a 10b5-1 trading plan that was adopted on March 3, 2023 to exercise options to purchase up to 36,824 shares of our common stock and sell up to 69,731 shares of our common stock between June 7, 2023 and February 29, 2024. On June 20, 2023, Mr. Tomovcsik adopted a 10b5-1 trading plan to exercise options to purchase up to 11,859 shares of our common stock and sell up to 41,859 shares of our common stock between September 18, 2023 and June 18, 2024.
John Tomovcsik, Trading Plan 1 [Member] | John Tomovcsik [Member]
Trading Arrangements, by Individual
Name	Mr. John Tomovcsik
Title	Executive Vice President, Chief Operating Officer
Rule 10b5-1 Arrangement Terminated	true
Termination Date	June 16, 2023
Arrangement Duration	267 days
John Tomovcsik, Trading Plan 1, Exercise Common Stock [Member] | John Tomovcsik [Member]
Trading Arrangements, by Individual
Aggregate Available	36,824	36,824
John Tomovcsik, Trading Plan 1, Sell Common Stock [Member] | John Tomovcsik [Member]
Trading Arrangements, by Individual
Aggregate Available	69,731	69,731
John Tomovcsik, Trading Plan 2 [Member] | John Tomovcsik [Member]
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 20, 2023
Arrangement Duration	274 days
John Tomovcsik, Trading Plan 2, Exercise Common Stock [Member] | John Tomovcsik [Member]
Trading Arrangements, by Individual
Aggregate Available	11,859	11,859
John Tomovcsik, Trading Plan 2, Sell Common Stock [Member] | John Tomovcsik [Member]
Trading Arrangements, by Individual
Aggregate Available	41,859	41,859

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Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Cash and Cash Equivalents	CASH AND CASH EQUIVALENTSCash and cash equivalents include cash on hand and cash invested in highly liquid short-term securities, which have remaining maturities at the date of purchase of less than 90 days. Cash and cash equivalents are carried at cost, which approximates fair value.
Accounts Receivable	ACCOUNTS RECEIVABLE We maintain an allowance for doubtful accounts and a credit memo reserve for estimated losses resulting from the potential inability of our customers to make required payments and potential disputes regarding billing and service issues.
Leases	LEASES We lease facilities for certain warehouses, data centers and office space. We also have land leases, including those on which certain facilities are located.
Revenues	REVENUESThe costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to obtain or fulfill customer contracts (collectively, "Contract Fulfillment Costs").DATA CENTER LESSOR CONSIDERATIONSOur Global Data Center Business features storage rental provided to customers at contractually specified rates over a fixed contractual period, which are accounted for in accordance with Accounting Standards Codification ("ASC") 842, Leases.
Acquisition and Integration Costs	ACQUISITION AND INTEGRATION COSTSAcquisition and integration costs represent operating expenditures directly associated with the closing and integration activities of our business acquisitions that have closed, or are highly probable of closing, and include (i) advisory, legal and professional fees to complete business acquisitions and (ii) costs to integrate acquired businesses into our existing operations, including move, severance and system integration costs (collectively, "Acquisition and Integration Costs").
Income Taxes	INCOME TAXESWe provide for income taxes during interim periods based on our estimate of the effective tax rate for the year.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTSIn December 2021, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers ("ASU 2021-08"). ASU 2021-08 requires that an entity recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with ASC 606, Revenue from Contracts with Customers, and for the related revenue contracts in accordance with ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), as if it had originated the contracts. We adopted ASU 2021-08 on January 1, 2023 on a prospective basis, and there was no material impact on our condensed consolidated financial statements.
Commitments and Contingencies	We are involved in litigation from time to time in the ordinary course of business, including litigation arising from damage to customer assets in our facilities caused by fires and other natural disasters. While the outcome of litigation is inherently uncertain, we do not believe any current litigation will have a material adverse effect on our consolidated financial condition, results of operations or cash flows.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2023

Accounting Policies [Abstract]

Schedule of Allowance for Credit Loss

The rollforward of the allowance for doubtful accounts and credit memo reserves for the six months ended June 30, 2023 is as follows:

Balance as of December 31, 2022	$	54,143
Credit memos charged to revenue	46,222
Allowance for bad debts charged to expense	16,172
Deductions and other(1)	(51,320)
Balance as of June 30, 2023	$	65,217

(1)Primarily consists of the issuance of credit memos, the write-off of accounts receivable and the impact associated with currency translation adjustments.

Schedule of Operating and Financing Lease Right-of-Use Assets and Lease Liabilities

Operating and financing lease right-of-use assets and lease liabilities as of June 30, 2023 and December 31, 2022 are as follows:

DESCRIPTION	JUNE 30, 2023		DECEMBER 31, 2022
Assets:
Operating lease right-of-use assets	$	2,671,371	$	2,583,704
Financing lease right-of-use assets, net of accumulated depreciation(1)	255,015		251,690
Liabilities:
Current
Operating lease liabilities	$	303,615	$	288,738
Financing lease liabilities(1)	49,148		43,857
Long-term
Operating lease liabilities	$	2,513,975	$	2,429,167
Financing lease liabilities(1)	297,190		289,048

(1)Financing lease right-of-use assets, current financing lease liabilities and long-term financing lease liabilities are included within Property, Plant and Equipment, Net, Current portion of long-term debt and Long-term Debt, net of current portion, respectively, within our Condensed Consolidated Balance Sheets.

Schedule of Lease Costs and Other Information

The components of the lease expense for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DESCRIPTION	2023		2022		2023		2022
Operating lease cost(1)	$	161,241	$	139,863	$	317,114	$	283,393
Financing lease cost:
Depreciation of financing lease right-of-use assets	$	10,202	$	10,578	$	20,210	$	22,032
Interest expense for financing lease liabilities	4,416		4,359		8,757		9,037

(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $34,418 and $65,998 for the three and six months ended June 30, 2023, respectively, and $28,788 and $59,296 for the three and six months ended June 30, 2022, respectively.

Supplemental cash flow information relating to our leases for the six months ended June 30, 2023 and 2022 is as follows:

	SIX MONTHS ENDED JUNE 30,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:	2023		2022
Operating cash flows used in operating leases	$	220,764	$	200,958
Operating cash flows used in financing leases (interest)	8,757		9,037
Financing cash flows used in financing leases	22,010		20,084
NON-CASH ITEMS:
Operating lease modifications and reassessments	$	44,779	$	67,699
New operating leases (including acquisitions and sale-leaseback transactions)	163,326		382,890

Schedule of Changes in the Carrying Value of Goodwill Attributable to Each Reportable Operating Segment

The changes in the carrying value of goodwill attributable to each reportable segment for the six months ended June 30, 2023 are as follows:

	GLOBAL RIM BUSINESS		GLOBAL DATA CENTER BUSINESS		CORPORATE AND OTHER		TOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization as of December 31, 2022	$	3,852,946	$	418,502	$	611,286	$	4,882,734
Non-tax deductible goodwill acquired during the period	22,876		—		383		23,259
Fair value and other adjustments	(80)		—		2,333		2,253
Currency translation adjustments	17,169		2,153		577		19,899
Goodwill balance, net of accumulated amortization as of June 30, 2023	$	3,892,911	$	420,655	$	614,579	$	4,928,145
Accumulated goodwill impairment balance as of June 30, 2023	$	132,409	$	—	$	26,011	$	158,420

Schedule of Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis

The assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2023 and December 31, 2022 are as follows:

			FAIR VALUE MEASUREMENTS AT JUNE 30, 2023 USING
DESCRIPTION	TOTAL CARRYING VALUE AT JUNE 30, 2023		QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)		SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)		SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds	$	11,761	$	—	$	11,761	$	—
Time Deposits	1,127		—		1,127		—
Trading Securities	10,340		10,322		18		—
Derivative Assets	28,286		—		28,286		—
Derivative Liabilities	4,540		—		4,540		—
Deferred Purchase Obligations(1)	201,190		—		—		201,190

			FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2022 USING
DESCRIPTION	TOTAL CARRYING VALUE AT DECEMBER 31, 2022		QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)		SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)		SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds	$	11,311	$	—	$	11,311	$	—
Time Deposits	1,102		—		1,102		—
Trading Securities	9,462		9,426		36		—
Derivative Assets	51,396		—		51,396		—
Derivative Liabilities	489		—		489		—
Deferred Purchase Obligations(1)	193,033		—		—		193,033

(1)Primarily relates to the fair value of the Deferred Purchase Obligation (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) associated with the ITRenew Transaction (as defined below in Note 3), which was determined utilizing a Monte-Carlo model and takes into account our forecasted projections as it relates to the underlying performance of the business. The Monte-Carlo simulation model incorporates assumptions as to expected gross profits over the applicable achievement period, including adjustments for the volatility of timing and amount of the associated revenue and costs, as well as discount rates that account for the risk of the underlying arrangement and overall market risks. Any material change to these assumptions may result in a significantly higher or lower fair value of the Deferred Purchase Obligation. The change in value of the Deferred Purchase Obligation during the three and six months ended June 30, 2023 was driven by the accretion of the obligation to present value.

Schedule of Changes in Accumulated Other Comprehensive Items, Net

The changes in Accumulated other comprehensive items, net for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30, 2023						THREE MONTHS ENDED JUNE 30, 2022
	FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL		FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL
Beginning of Period	$	(414,832)	$	9,064	$	(405,768)	$	(313,801)	$	19,443	$	(294,358)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	18,155		—		18,155		(186,828)		—		(186,828)
Change in fair value of derivative instruments	—		7,896		7,896		—		34,211		34,211
Reclassifications from accumulated other comprehensive items, net	—		(2,527)		(2,527)		—		—		—
Total other comprehensive income (loss)	18,155		5,369		23,524		(186,828)		34,211		(152,617)
End of Period	$	(396,677)	$	14,433	$	(382,244)	$	(500,629)	$	53,654	$	(446,975)

	SIX MONTHS ENDED JUNE 30, 2023						SIX MONTHS ENDED JUNE 30, 2022
	FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL		FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS		DERIVATIVE FINANCIAL INSTRUMENTS		TOTAL
Beginning of Period	$	(454,509)	$	12,506	$	(442,003)	$	(341,024)	$	2,677	$	(338,347)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	57,832		—		57,832		(159,605)		—		(159,605)
Change in fair value of derivative instruments	—		4,454		4,454		—		50,977		50,977
Reclassifications from accumulated other comprehensive items, net	—		(2,527)		(2,527)		—		—		—
Total other comprehensive income (loss)	57,832		1,927		59,759		(159,605)		50,977		(108,628)
End of Period	$	(396,677)	$	14,433	$	(382,244)	$	(500,629)	$	53,654	$	(446,975)

Schedule of Cost and Accumulated Amortization Associated with Contract Fulfillment Costs

Contract Fulfillment Costs as of June 30, 2023 and December 31, 2022 are as follows:

	JUNE 30, 2023						DECEMBER 31, 2022
	GROSS CARRYING AMOUNT		ACCUMULATED AMORTIZATION		NET CARRYING AMOUNT		GROSS CARRYING AMOUNT		ACCUMULATED AMORTIZATION		NET CARRYING AMOUNT
Intake Costs asset	$	75,428	$	(47,919)	$	27,509	$	68,345	$	(42,132)	$	26,213
Commissions asset	148,003		(66,431)		81,572		133,145		(58,949)		74,196

Schedule of Deferred Revenue Liabilities

Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows:

DESCRIPTION	LOCATION IN BALANCE SHEET	JUNE 30, 2023		DECEMBER 31, 2022
Deferred revenue - Current	Deferred revenue	$	336,068	$	328,910
Deferred revenue - Long-term	Other Long-term Liabilities	22,343		32,960

Schedule of Revenue

Storage rental revenue, including revenue associated with power and connectivity, associated with our Global Data Center Business for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Storage rental revenue(1)	$	110,990	$	89,768	$	218,425	$	177,219

(1)Revenue associated with power and connectivity included within storage rental revenue was $38,692 and $79,364 for the three and six months ended June 30, 2023, respectively, and $30,713 and $59,031 for the three and six months ended June 30, 2022, respectively.

Schedule of Stock-based Compensation Expense

Stock-based compensation expense for the Employee Stock-Based Awards for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Stock-based compensation expense	$	22,373	$	20,256	$	34,882	$	31,597

Schedule of Acquisition and Integration Costs

Acquisition and Integration Costs for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Acquisition and Integration Costs	$	1,511	$	16,878	$	3,106	$	32,539

Schedule of Components of Gain/Loss on Sale/Disposal of Property, Plant and Equipment

(Gain) loss on disposal/write-down of property, plant and equipment, net for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022(2)		2023(1)		2022(2)
(Gain) Loss on disposal/write-down of property, plant and equipment, net(3)	$	(1,505)	$	(51,249)	$	(14,566)	$	(51,954)

(1)    The gains for the six months ended June 30, 2023 primarily consist of a gain of approximately $18,500 associated with a sale-leaseback transaction of a facility in Singapore during the first quarter of 2023.

(2)    The gains for the three and six months ended June 30, 2022 primarily consist of gains of approximately $49,000 associated with sale and sale-leaseback transactions of 11 facilities and parcels of land in the United States.

(3)    The gains recognized during both 2023 and 2022 are the result of our program to monetize a small portion of our industrial assets through sale and sale-leaseback transactions. The terms for these leases are consistent with the terms of our lease portfolio, which are disclosed in detail in Note 2.j. to Notes to Consolidated Financial Statements included in our Annual Report.

Schedule of Other Expense (Income), Net

Other expense (income), net for the three and six months ended June 30, 2023 and 2022 consists of the following:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DESCRIPTION	2023		2022		2023		2022
Foreign currency transaction losses (gains), net(1)(2)	$	15,063	$	(55,039)	$	29,487	$	(68,240)
Debt extinguishment expense	—		—		—		671
Other, net(3)(4)	47,887		13,822		54,663		82,253
Other Expense (Income), Net	$	62,950	$	(41,217)	$	84,150	$	14,684

(1)The losses for the three and six months ended June 30, 2023 primarily consist of the impact of changes in the exchange rate of the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(2)The gains for the three and six months ended June 30, 2022 primarily consist of the impact of changes in the exchange rate of the Euro and the British pound sterling against the United States dollar on our intercompany balances with and between certain of our subsidiaries.

(3)Other, net for the six months ended June 30, 2023 consists primarily of a loss of approximately $38,000 associated with the remeasurement to fair value of our previously held equity interest in the Clutter JV (as defined and discussed in Note 4) as well as losses on our equity method investments and the change in value of the Deferred Purchase Obligation.

(4)Other, net for the six months ended June 30, 2022 consists primarily of (i) a loss of approximately $105,800 associated with the OSG Deconsolidation (as defined in Note 4 to Notes to Consolidated Financial Statements included in our Annual Report), partially offset by (ii) a gain of approximately $35,800 associated with the Clutter Transaction (as defined in Note 5 to Notes to Consolidated Financial Statements included in our Annual Report).

Schedule of Income Taxes

Our effective tax rates for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023(1)		2022(2)		2023(1)		2022(2)
Effective Tax Rate	78.8	%	8.2	%	24.0	%	10.4	%

(1)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2023 were (i) the loss of approximately $38,000 recorded in Other, net a component of Other expense (income), net during the second quarter of 2023 to reflect the remeasurement of our previously held equity interest in the Clutter JV to fair value, for which there was no tax impact, (ii) the benefits derived from the dividends paid deduction and (iii) the differences in the tax rates to which our foreign earnings are subject.

(2)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2022 were the benefits derived from the dividends paid deduction and the differences in the tax rates to which our foreign earnings are subject. In addition, there were gains and losses recorded in Other expense (income), net and Gain (loss) on disposal/write-down of property, plant and equipment net, during the period for which there was an insignificant tax impact. During the first quarter of 2022, there was also a release of valuation allowances on deferred tax assets of our U.S. taxable REIT subsidiaries of approximately $9,900 as a result of our acquisition of Intercept Parent, Inc. ("ITRenew").

Schedule of Basic and Diluted Net Income (Loss) Per Share Attributable to the Entity

The calculations of basic and diluted income (loss) per share for the three and six months ended June 30, 2023 and 2022 are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,029		1,777		1,969		1,185
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)	$	114	$	200,081	$	64,709	$	242,380
Weighted-average shares—basic	291,825,000		290,756,000		291,633,000		290,542,000
Effect of dilutive potential stock options	1,322,000		1,249,262		1,269,000		1,122,444
Effect of dilutive potential RSUs and PUs	380,000		481,972		386,000		501,975
Weighted-average shares—diluted	293,527,000		292,487,234		293,288,000		292,166,419
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic	$	0.00	$	0.69	$	0.22	$	0.83
Diluted	$	0.00	$	0.68	$	0.22	$	0.83
Antidilutive stock options, RSUs and PUs excluded from the calculation	157,132		234,085		151,431		494,833

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Acquisitions (Tables)

6 Months Ended

Jun. 30, 2023

Business Combination and Asset Acquisition [Abstract]

Schedule of recognized identified assets acquired and liabilities assumed

A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for all of our acquisitions closed during the six months ended June 30, 2023 is as follows:

	SIX MONTHS ENDED JUNE 30, 2023
Cash Paid (gross of cash acquired)(1)	$	21,215
Deferred Purchase Obligation, Purchase Price Holdbacks and Other	9,290
Fair Value of Previously Held Equity Interest	9,000
Settlement of Pre-Existing Relationships	20,122
Total Consideration	59,627
Fair Value of Identifiable Assets Acquired	56,248
Fair Value of Identifiable Liabilities Assumed	(19,880)
Total Fair Value of Identifiable Net Assets Acquired	36,368
Goodwill Initially Recorded(2)	$	23,259

(1)Cash paid for acquisitions, net in our Condensed Consolidated Statement of Cash Flows includes (i) cash acquired of $1,980 relating to acquisitions completed during the six months ended June 30, 2023 and (ii) contingent and other payments of $2,230 for the six months ended June 30, 2023 relating to acquisitions completed prior to January 1, 2023.

(2)Goodwill is primarily attributable to the assembled workforce, expanded market opportunities and costs and other operating synergies anticipated upon the integration of the operations of us and the acquired businesses.

Business Acquisition, Pro Forma Information

These operating expenditures have been reflected within the results of operations in the Pro Forma Financial Information as if they were incurred on January 1, 2021.

	THREE MONTHS ENDED JUNE 30, 2022		SIX MONTHS ENDED JUNE 30, 2022
Total Revenues	$	1,289,534	$	2,555,554
Income from Continuing Operations	$	201,858	$	243,696

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Investments (Tables)

6 Months Ended

Jun. 30, 2023

Investments, All Other Investments [Abstract]

Schedule of Equity Method Investments

The following joint ventures are accounted for as equity method investments and are presented as a component of Other within Other assets, net in our Condensed Consolidated Balance Sheets. The carrying values and equity interests in our joint ventures at June 30, 2023 and December 31, 2022 are as follows:

	JUNE 30, 2023				DECEMBER 31, 2022
	CARRYING VALUE		EQUITY INTEREST		CARRYING VALUE		EQUITY INTEREST
Web Werks JV	$	98,650	53.58	%	$	98,278	53.58	%
Joint venture with AGC Equity Partners (the "Frankfurt JV")	59,394		20.00	%	37,194		20.00	%
Clutter JV	—		—	%	54,172		26.73	%

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Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

The fair value of derivative instruments recognized in our Condensed Consolidated Balance Sheets at June 30, 2023 and December 31, 2022, by derivative instrument, are as follows:

	JUNE 30, 2023				DECEMBER 31, 2022
DERIVATIVE INSTRUMENTS(1)	Assets		Liabilities		Assets		Liabilities
Cash Flow Hedges(2)
Interest rate swap agreements	$	6,852	$	—	$	12,995	$	489
Net Investment Hedges(3)
Cross-currency swap agreements	21,434		4,540		38,401		—

(1)Our derivative assets are included as a component of (i) Prepaid expenses and other or (ii) Other within Other assets, net and our derivative liabilities are included as a component of (i) Accrued expenses and other current liabilities or (ii) Other long-term liabilities in our Condensed Consolidated Balance Sheets. As of June 30, 2023, $1,459 is included within Prepaid expenses and other, $26,827 is included within Other assets and $4,540 is included within Accrued expense and other current liabilities. As of December 31, 2022, $2,606 is included within Prepaid expenses and other, $48,790 is included within Other assets and $489 is included within Other long-term liabilities.

(2)As of June 30, 2023, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our interest rate swap agreements are $14,433, which include $7,581 related to our terminated interest rate swap agreements.

(3)As of June 30, 2023, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our cross-currency swap agreements are $37,645, which include $20,751 related to the excluded component of our cross-currency swap agreements.

Schedule of (Losses) Gains for Derivative Instruments

Unrealized gains (losses) recognized in Accumulated other comprehensive income during the three and six months ended June 30, 2023 and 2022, by derivative instrument, are as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DERIVATIVE INSTRUMENTS	2023		2022		2023		2022
Cash Flow Hedges
Interest rate swap agreements	$	7,896	$	3,932	$	4,454	$	15,402
Net Investment Hedges
Cross-currency swap agreements	(12,704)		30,279		(21,507)		35,575
Cross-currency swap agreements (excluded component)	5,817		—		11,651		—

Gains (losses) recognized in Net income during the three and six months ended June 30, 2023 and 2022, by derivative instrument, are as follows:

		THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
DERIVATIVE INSTRUMENTS	Location of gain (loss)	2023		2022		2023		2022
Cash Flow Hedges
Interest rate swap agreements	Interest expense	$	2,527	$	—	$	2,527	$	—
Net Investment Hedges
Cross-currency swap agreements (excluded component)	Interest expense	(5,817)		—		(11,651)		—

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Debt (Tables)

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Schedule of Carrying Amount and Fair Value of Long-Term Debt Instruments

Long-term debt is as follows:

	JUNE 30, 2023								DECEMBER 31, 2022
	DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT		FAIR VALUE		DEBT (INCLUSIVE OF DISCOUNT)		UNAMORTIZED DEFERRED FINANCING COSTS		CARRYING AMOUNT		FAIR VALUE
Revolving Credit Facility(1)	$	679,500	$	(5,332)	$	674,168	$	679,500	$	1,072,200	$	(6,790)	$	1,065,410	$	1,072,200
Term Loan A(1)	234,375		—		234,375		234,375		240,625		—		240,625		240,625
Term Loan B(1)	662,685		(3,122)		659,563		663,250		666,073		(3,747)		662,326		666,750
Australian Dollar Term Loan	196,333		(543)		195,790		198,005		202,641		(633)		202,008		204,623
UK Bilateral Revolving Credit Facility	177,277		—		177,277		177,277		169,361		—		169,361		169,361
37/8% GBP Senior Notes due 2025 (the "GBP Notes")	506,506		(2,231)		504,275		472,474		483,888		(2,589)		481,299		445,206
47/8% Senior Notes due 2027 (the "47/8% Notes due 2027")(2)	1,000,000		(6,043)		993,957		932,500		1,000,000		(6,754)		993,246		917,500
51/4% Senior Notes due 2028 (the "51/4% Notes due 2028")(2)	825,000		(5,609)		819,391		770,344		825,000		(6,200)		818,800		754,875
5% Senior Notes due 2028 (the "5% Notes due 2028")(2)	500,000		(3,678)		496,322		461,250		500,000		(4,039)		495,961		450,000
7% Senior Notes due 2029 (the "7% Notes due 2029")(2)	1,000,000		(11,853)		988,147		992,500		—		—		—		—
47/8% Senior Notes due 2029 (the "47/8% Notes due 2029")(2)	1,000,000		(9,041)		990,959		892,500		1,000,000		(9,764)		990,236		865,000
51/4% Senior Notes due 2030 (the "51/4% Notes due 2030")(2)	1,300,000		(10,655)		1,289,345		1,166,750		1,300,000		(11,407)		1,288,593		1,111,500
41/2% Senior Notes due 2031 (the "41/2% Notes")(2)	1,100,000		(9,539)		1,090,461		940,500		1,100,000		(10,161)		1,089,839		891,000
5% Senior Notes due 2032 (the "5% Notes due 2032")	750,000		(11,858)		738,142		645,000		750,000		(12,511)		737,489		622,500
55/8% Senior Notes due 2032 (the "55/8% Notes")(2)	600,000		(5,275)		594,725		535,500		600,000		(5,566)		594,434		520,500
Real Estate Mortgages, Financing Lease Liabilities and Other	457,724		(483)		457,241		457,724		425,777		(578)		425,199		425,777
Accounts Receivable Securitization Program	343,100		(426)		342,674		343,100		314,700		(531)		314,169		314,700
Total Long-term Debt	11,332,500		(85,688)		11,246,812				10,650,265		(81,270)		10,568,995
Less Current Portion	(102,582)		—		(102,582)				(87,546)		—		(87,546)
Long-term Debt, Net of Current Portion	$	11,229,918	$	(85,688)	$	11,144,230			$	10,562,719	$	(81,270)	$	10,481,449

(1)Collectively, the “Credit Agreement”. The Credit Agreement consists of a revolving credit facility (the “Revolving Credit Facility”), a term loan A (the “Term Loan A”) and a term loan B (the "Term Loan B"). The Revolving Credit Facility and the Term Loan A are scheduled to mature on March 18, 2027. The Term Loan B is scheduled to mature on January 2, 2026. The remaining amount available for borrowing under the Revolving Credit Facility as of June 30, 2023 was $1,566,061 (which amount represents the maximum availability as of such date). The weighted average interest rate in effect under the Revolving Credit Facility was 7.0% and 6.2% as of June 30, 2023 and December 31, 2022, respectively.

(2)Collectively, the "Parent Notes". IMI is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI’s United States subsidiaries that represent the substantial majority of our United States operations (the "Note Guarantors"). These guarantees are joint and several obligations of the Note Guarantors. The remainder of our subsidiaries do not guarantee the Parent Notes.

On May 15, 2023, IMI completed a private offering of:

SERIES OF NOTES	AGGREGATE PRINCIPAL AMOUNT		MATURITY DATE	INTEREST PAYMENT DUE	PAR CALL DATE(1)
7% Notes due 2029	$	1,000,000	February 15, 2029	February 15 and August 15	August 15, 2025

(1)We may redeem the 7% Notes due 2029 at any time, at our option, in whole or in part. Prior to the par call date, we may redeem the 7% Notes due 2029 at the redemption price or make-whole premium specified in the indenture governing the 7% Notes due 2029, together with accrued and unpaid interest to, but excluding, the redemption date. On or after the par call date, we may redeem the 7% Notes due 2029 at a price equal to 100% of the principal amount being redeemed, together with accrued and unpaid interest to, but excluding, the redemption date.

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Stockholders' Equity Matters (Tables)

6 Months Ended

Jun. 30, 2023

Equity [Abstract]

Schedule of Dividend Declared and Payments

In fiscal year 2022 and the six months ended June 30, 2023, our board of directors declared the following dividends:

DECLARATION DATE	DIVIDEND PER SHARE		RECORD DATE	TOTAL AMOUNT		PAYMENT DATE
February 24, 2022	$	0.6185	March 15, 2022	$	179,661	April 6, 2022
April 28, 2022	0.6185		June 15, 2022	179,781		July 6, 2022
August 4, 2022	0.6185		September 15, 2022	179,790		October 4, 2022
November 3, 2022	0.6185		December 15, 2022	179,866		January 5, 2023
February 23, 2023	0.6185		March 15, 2023	180,339		April 5, 2023
May 4, 2023	0.6185		June 15, 2023	180,493		July 6, 2023

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Schedule of Analysis of Business Segment Information

An analysis of our business segment information and reconciliation to the accompanying Condensed Consolidated Financial Statements for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Global RIM Business
Total Revenues	$	1,159,867	$	1,070,476	$	2,286,393	$	2,119,367
Adjusted EBITDA	499,062		469,368		976,846		918,163
Global Data Center Business
Total Revenues	$	118,033	$	100,088	$	230,338	$	197,075
Adjusted EBITDA	53,809		42,307		104,444		84,284
Corporate and Other
Total Revenues	$	80,036	$	118,970	$	155,554	$	221,138
Adjusted EBITDA	(77,213)		(56,969)		(144,824)		(116,747)
Total Consolidated
Total Revenues	$	1,357,936	$	1,289,534	$	2,672,285	$	2,537,580
Adjusted EBITDA	475,658		454,706		936,466		885,700

Schedule of Reconciliation of Net Income (Loss) to Adjusted EBITDA

A reconciliation of Net Income (Loss) to Adjusted EBITDA on a consolidated basis for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Net Income (Loss)	$	1,143	$	201,858	$	66,678	$	243,565
Add/(Deduct):
Interest expense, net	144,178		115,057		281,347		229,499
Provision (benefit) for income taxes	4,255		18,083		21,013		28,163
Depreciation and amortization	195,367		178,254		377,461		361,869
Acquisition and Integration Costs	1,511		16,878		3,106		32,539
Restructuring and other transformation	45,588		—		82,501		—
(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	(1,505)		(51,249)		(14,566)		(51,954)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	58,694		(46,103)		76,185		7,412
Stock-based compensation expense	22,373		20,256		34,882		31,597
Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures	4,054		1,672		7,859		3,010
Adjusted EBITDA	$	475,658	$	454,706	$	936,466	$	885,700

Schedule of Revenues by Product and Service Lines by Segment

Information as to our revenues by product and service lines by segment for the three and six months ended June 30, 2023 and 2022 is as follows:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Global RIM Business
Records Management(1)	$	898,634	$	818,993	$	1,766,622	$	1,621,546
Data Management(1)	130,251		124,394		259,845		258,050
Information Destruction(1)(2)	130,982		127,089		259,926		239,771
Data Center(1)	—		—		—		—
Global Data Center Business
Records Management(1)	$	—	$	—	$	—	$	—
Data Management(1)	—		—		—		—
Information Destruction(1)	—		—		—		—
Data Center(1)	118,033		100,088		230,338		197,075
Corporate and Other
Records Management(1)	$	37,409	$	36,141	$	71,757	$	68,039
Data Management(1)	—		—		—		—
Information Destruction(1)(3)	42,627		82,829		83,797		153,099
Data Center(1)	—		—		—		—
Total Consolidated
Records Management(1)	$	936,043	$	855,134	$	1,838,379	$	1,689,585
Data Management(1)	130,251		124,394		259,845		258,050
Information Destruction(1)(2)(3)	173,609		209,918		343,723		392,870
Data Center(1)	118,033		100,088		230,338		197,075

(1)Each of these offerings has a component of revenue that is storage rental related and a component that is service revenue, except for information destruction, which does not have a storage rental component.

(2)Includes secure shredding services.

(3)Includes product revenue from ITRenew.

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Related Parties (Tables)

6 Months Ended

Jun. 30, 2023

Related Party Transactions [Abstract]

Schedule of Revenue Recognized

Revenue recognized in the accompanying Condensed Consolidated Statements of Operations under these agreements for the three and six months ended June 30, 2023 and 2022 is as follows (approximately):

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2023		2022		2023		2022
Frankfurt JV Agreements(1)	$	800	$	5,700	$	1,700	$	12,800
MakeSpace Agreement and Clutter Agreement(2)	7,000		7,400		13,000		14,400

(1)Revenue associated with the Frankfurt JV Agreements is presented as a component of our Global Data Center Business segment.

(2)Revenue associated with the MakeSpace Agreement and the Clutter Agreement is presented as a component of our Global RIM Business segment.

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Restructuring And Other Transformation (Tables)

6 Months Ended

Jun. 30, 2023

Restructuring and Related Activities [Abstract]

Schedule of Restructuring And Other Transformation

Restructuring and other transformation related to Project Matterhorn included in the accompanying Condensed Consolidated Statement of Operations for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Restructuring	$	16,127	$	28,084	$	41,376
Other transformation	29,461		54,417		83,058
Restructuring and other transformation	$	45,588	$	82,501	$	124,434

Restructuring costs for Project Matterhorn, included as a component of Restructuring and other transformation in the accompanying Condensed Consolidated Statement of Operations, by segment for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Global RIM Business	$	15,000	$	24,525	$	37,608
Global Data Center Business	—		78		78
Corporate and Other	1,127		3,481		3,690
Total restructuring costs	$	16,127	$	28,084	$	41,376

Other transformation costs for Project Matterhorn, included as a component of Restructuring and other transformation in the accompanying Condensed Consolidated Statement of Operations, by segment for the three and six months ended June 30, 2023, and from the inception of Project Matterhorn through June 30, 2023, is as follows:

	THREE MONTHS ENDED JUNE 30, 2023		SIX MONTHS ENDED JUNE 30, 2023		FROM INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2023
Global RIM Business	$	4,958	$	8,443	$	12,344
Global Data Center Business	498		1,368		1,426
Corporate and Other	24,005		44,606		69,288
Total other transformation costs	$	29,461	$	54,417	$	83,058

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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts and Credit Memo Reserves (Details) - Allowance for doubtful accounts $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 54,143
Credit memos charged to revenue	46,222
Allowance for bad debts charged to expense	16,172
Deductions and other	(51,320)
Ending balance	$ 65,217

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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Operating lease right-of-use assets	$ 2,671,371	$ 2,583,704
Financing lease right-of-use assets, net of accumulated depreciation	255,015	251,690
Current
Operating lease liabilities	303,615	288,738
Finance lease liabilities	49,148	43,857
Long-term
Operating lease liabilities	2,513,975	2,429,167
Finance lease liabilities	$ 297,190	$ 289,048
Finance lease, right-of-use asset, statement of financial position [Extensible List]	Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization	Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Operating lease, liability, current, statement of financial position [Extensible List]	Accrued expenses and other current liabilities (includes current portion of operating lease liabilities)	Accrued expenses and other current liabilities (includes current portion of operating lease liabilities)
Finance lease, liability, current, statement of financial position [Extensible List]	Current portion of long-term debt	Current portion of long-term debt
Finance lease, liability, noncurrent, statement of financial position [Extensible List]	Long-term Debt, net of current portion	Long-term Debt, net of current portion

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Summary of Significant Accounting Policies - Leases Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounting Policies [Abstract]
Operating lease cost	$ 161,241	$ 139,863	$ 317,114	$ 283,393
Depreciation of financing lease right-of-use assets	10,202	10,578	20,210	22,032
Interest expense for financing lease liabilities	4,416	4,359	8,757	9,037
Variable lease costs	$ 34,418	$ 28,788	$ 65,998	$ 59,296

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Summary of Significant Accounting Policies - Leases Narrative (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Accounting Policies [Abstract]
Operating leases not yet commenced, term	25 years
Operating leases not yet commenced	$ 170,100

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Summary of Significant Accounting Policies - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Accounting Policies [Abstract]
Operating cash flows used in operating leases	$ 220,764	$ 200,958
Operating cash flows used in financing leases (interest)	8,757	9,037
Financing cash flows used in financing leases	22,010	20,084
Operating lease modifications and reassessments	44,779	67,699
New operating leases (including acquisitions and sale-leaseback transactions)	$ 163,326	$ 382,890

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Summary of Significant Accounting Policies - Schedule of Changes in Carrying Value of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	$ 4,882,734
Non-tax deductible goodwill acquired during the period	23,259
Fair value and other adjustments	2,253
Currency translation adjustments	19,899
Goodwill ending balance	4,928,145
Accumulated goodwill impairment	158,420
GLOBAL RIM BUSINESS
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	3,852,946
Non-tax deductible goodwill acquired during the period	22,876
Fair value and other adjustments	(80)
Currency translation adjustments	17,169
Goodwill ending balance	3,892,911
Accumulated goodwill impairment	132,409
GLOBAL DATA CENTER BUSINESS
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	418,502
Non-tax deductible goodwill acquired during the period	0
Fair value and other adjustments	0
Currency translation adjustments	2,153
Goodwill ending balance	420,655
Accumulated goodwill impairment	0
CORPORATE AND OTHER
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	611,286
Non-tax deductible goodwill acquired during the period	383
Fair value and other adjustments	2,333
Currency translation adjustments	577
Goodwill ending balance	614,579
Accumulated goodwill impairment	$ 26,011

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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	$ 10,322	$ 9,426
Derivative Assets	0	0
Derivative Liabilities	0	0
Deferred Purchase Obligations	0	0
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) | Money Market Funds
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	0	0
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) | Time Deposits
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	18	36
Derivative Assets	28,286	51,396
Derivative Liabilities	4,540	489
Deferred Purchase Obligations	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Money Market Funds
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	11,761	11,311
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Time Deposits
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	1,127	1,102
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	0	0
Derivative Assets	0	0
Derivative Liabilities	0	0
Deferred Purchase Obligations	201,190	193,033
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Money Market Funds
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Time Deposits
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	0	0
Estimate of Fair Value
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	10,340	9,462
Derivative Assets	28,286	51,396
Derivative Liabilities	4,540	489
Deferred Purchase Obligations	201,190	193,033
Estimate of Fair Value | Money Market Funds
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	11,761	11,311
Estimate of Fair Value | Time Deposits
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	$ 1,127	$ 1,102

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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Rollforward
Beginning of Period	$ 545,589	$ 758,771	$ 636,793	$ 857,068
Other comprehensive income (loss):
Foreign currency translation and other adjustments	18,155	(186,828)	57,832	(159,605)
Change in Fair Value of Derivative Instruments	7,896	34,211	4,454	50,977
Reclassifications from Accumulated Other Comprehensive Items, net	(2,527)	0	(2,527)	0
Total other comprehensive income (loss)	23,524	(152,617)	59,759	(108,628)
End of period	416,343	651,775	416,343	651,775
TOTAL
AOCI Rollforward
Beginning of Period	(405,768)	(294,358)	(442,003)	(338,347)
Other comprehensive income (loss):
End of period	(382,244)	(446,975)	(382,244)	(446,975)
FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS
AOCI Rollforward
Beginning of Period	(414,832)	(313,801)	(454,509)	(341,024)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	18,155	(186,828)	57,832	(159,605)
Change in Fair Value of Derivative Instruments	0	0	0	0
Reclassifications from Accumulated Other Comprehensive Items, net	0	0	0	0
Total other comprehensive income (loss)	18,155	(186,828)	57,832	(159,605)
End of period	(396,677)	(500,629)	(396,677)	(500,629)
DERIVATIVE FINANCIAL INSTRUMENTS
AOCI Rollforward
Beginning of Period	9,064	19,443	12,506	2,677
Other comprehensive income (loss):
Foreign currency translation and other adjustments	0	0	0	0
Change in Fair Value of Derivative Instruments	7,896	34,211	4,454	50,977
Reclassifications from Accumulated Other Comprehensive Items, net	(2,527)	0	(2,527)	0
Total other comprehensive income (loss)	5,369	34,211	1,927	50,977
End of period	$ 14,433	$ 53,654	$ 14,433	$ 53,654

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Summary of Significant Accounting Policies - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Intake Costs asset
Contract With Customer, Asset And Liabilities [Line Items]
GROSS CARRYING AMOUNT	$ 75,428	$ 68,345
ACCUMULATED AMORTIZATION	(47,919)	(42,132)
NET CARRYING AMOUNT	27,509	26,213
Commissions asset
Contract With Customer, Asset And Liabilities [Line Items]
GROSS CARRYING AMOUNT	148,003	133,145
ACCUMULATED AMORTIZATION	(66,431)	(58,949)
NET CARRYING AMOUNT	$ 81,572	$ 74,196

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Summary of Significant Accounting Policies - Summary of Deferred Revenue Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Deferred revenue - Current	$ 336,068	$ 328,910
Deferred revenue - Long-term	$ 22,343	$ 32,960

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Summary of Significant Accounting Policies - Storage Rental (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Lessor, Lease, Description [Line Items]
Storage rental	$ 1,357,936	$ 1,289,534	$ 2,672,285	$ 2,537,580
GLOBAL DATA CENTER BUSINESS
Lessor, Lease, Description [Line Items]
Storage rental	118,033	100,088	230,338	197,075
Storage Rental
Lessor, Lease, Description [Line Items]
Storage rental	830,756	753,126	1,640,845	1,504,196
Storage Rental | GLOBAL DATA CENTER BUSINESS
Lessor, Lease, Description [Line Items]
Storage rental	110,990	89,768	218,425	177,219
Storage Rental, Power and Connectivity | GLOBAL DATA CENTER BUSINESS
Lessor, Lease, Description [Line Items]
Storage rental	$ 38,692	$ 30,713	$ 79,364	$ 59,031

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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounting Policies [Abstract]
Stock-based compensation expense	$ 22,373	$ 20,256	$ 34,882	$ 31,597
Unrecognized compensation cost	$ 87,880		$ 87,880

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Summary of Significant Accounting Policies - Acquisition and Integration costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounting Policies [Abstract]
Acquisition and Integration Costs	$ 1,511	$ 16,878	$ 3,106	$ 32,539

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Summary of Significant Accounting Policies - (Gain) Loss on Disposal/Write-Down of Property, Plant and Equipment, Net (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) facility	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) facility
Accumulated Other Comprehensive Income (Loss) [Line Items]
(Gain) loss on disposal/write-down of property, plant and equipment, net	$ (1,505)	$ (51,249)	$ (14,566)	$ (51,954)
Facilities in Singapore
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sale and sale-leaseback transactions			$ 18,500
Facilities And Parcels Of Land In The United States [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sale and sale-leaseback transactions		$ 49		$ 49
Number of sale lease back properties | facility		11		11

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Summary of Significant Accounting Policies - Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounting Policies [Abstract]
Foreign currency transaction losses (gains), net	$ 15,063	$ (55,039)	$ 29,487	$ (68,240)
Debt extinguishment expense	0	0	0	671
Other, net	47,887	13,822	54,663	82,253
Other Expense (Income), Net	62,950	$ (41,217)	84,150	14,684
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on disposal				35,821
Clutter JV
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss associated with the Clutter transactions	$ 38,000		$ 38,000
(Loss) gain on disposal				35,800
OSG Records Management (Europe) Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on disposal				$ (105,800)

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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022
Accounting Policies [Abstract]
Effective Tax Rate	78.80%	8.20%	24.00%	10.40%
Federal statutory tax rate	21.00%	21.00%	21.00%	21.00%
Deferred tax assets					$ 9,900

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Summary of Significant Accounting Policies - Income (Loss) Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income (Loss) Per Share-Basic and Diluted
Net Income (Loss)	$ 1,143	$ 201,858	$ 66,678	$ 243,565
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1,029	1,777	1,969	1,185
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)	$ 114	$ 200,081	$ 64,709	$ 242,380
Weighted-average shares—basic (in shares)	291,825,000	290,756,000	291,633,000	290,542,000
Effect of dilutive potential stock options (in shares)	1,322,000	1,249,262	1,269,000	1,122,444
Effect of dilutive potential restricted stock, RSUs and PUs (in shares)	380,000	481,972	386,000	501,975
Weighted-average shares—diluted (in shares)	293,527,000	292,487,234	293,288,000	292,166,419
Basic (in dollars per share)	$ 0.00	$ 0.69	$ 0.22	$ 0.83
Diluted (in dollars per share)	$ 0.00	$ 0.68	$ 0.22	$ 0.83
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares)	157,132	234,085	151,431	494,833

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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands			6 Months Ended
	Jun. 29, 2023	Jan. 25, 2022	Jun. 30, 2023	Sep. 30, 2023
Clutter Intermediate, Inc | Forecast
Business Acquisition [Line Items]
Equity interest expected to be sold				15.00%
Clutter Intermediate, Inc
Business Acquisition [Line Items]
Ownership acquired	100.00%
Purchase price	$ 59,100		$ 59,627
ITRenew
Business Acquisition [Line Items]
Ownership acquired		80.00%
Business combination, price of acquisition, expected		$ 725,000
Operating expenditures			$ 59,370

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Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 29, 2023	Jun. 30, 2023	Dec. 31, 2022
Fair Value of Identifiable Assets Acquired
Goodwill initially recorded		$ 4,928,145	$ 4,882,734
Proceeds from previous acquisition		1,980
Cash paid for previous acquisition		2,230
Clutter Intermediate, Inc
Consideration paid for acquisitions
Cash paid (gross of cash acquired)		21,215
Deferred purchase obligation, purchase price holdbacks and other		9,290
Fair Value of Previously Held Equity Interest		9,000
Settlement of Pre-Existing Relationships		20,122
Total Consideration	$ 59,100	59,627
Fair Value of Identifiable Assets Acquired
Fair Value of Identifiable Assets Acquired		56,248
Fair Value of Identifiable Liabilities Assumed		(19,880)
Total Fair Value of Identifiable Net Assets Acquired		36,368
Goodwill initially recorded		$ 23,259

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Acquisitions - Pro Forma Financial Information (Details) - ITRenew - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Total Revenues	$ 1,289,534	$ 2,555,554
Income from Continuing Operations	$ 201,858	$ 243,696

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Investments (Details) ₨ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jul. 07, 2023 USD ($)	Jul. 07, 2023 INR (₨)	Jun. 28, 2023	Dec. 31, 2022 USD ($)	Dec. 31, 2022 INR (₨)	Feb. 28, 2022
Schedule of Equity Method Investments [Line Items]
Gain on disposal				$ 35,821
Clutter JV
Schedule of Equity Method Investments [Line Items]
EQUITY INTEREST	0.00%		0.00%				27.00%	26.73%	26.73%	27.00%
Gain on disposal				$ 35,800
CARRYING VALUE	$ 0		$ 0					$ 54,172
Loss associated with the Clutter transactions	$ 38,000		$ 38,000
MakeSpace JV
Schedule of Equity Method Investments [Line Items]
EQUITY INTEREST										49.99%
Gain on disposal		$ 35,800
Web Werks JV
Schedule of Equity Method Investments [Line Items]
EQUITY INTEREST	53.58%		53.58%					53.58%	53.58%
Equity method investments, fair value disclosure								$ 96,200	₨ 7,500,000
CARRYING VALUE	$ 98,650		$ 98,650					$ 98,278
Web Werks JV | Subsequent Event
Schedule of Equity Method Investments [Line Items]
EQUITY INTEREST					63.39%	63.39%
Equity method investments, fair value disclosure					$ 45,300	₨ 3,750,000
Joint venture with AGC Equity Partners (the "Frankfurt JV")
Schedule of Equity Method Investments [Line Items]
EQUITY INTEREST	20.00%		20.00%					20.00%	20.00%
CARRYING VALUE	$ 59,394		$ 59,394					$ 37,194

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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Apr. 30, 2023	Dec. 31, 2022	Mar. 31, 2022
Interest rate swap agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 350,000			$ 350,000
Cumulative net gain in AOCI	14,433
Interest Rate Swap, Terminated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gain in AOCI	7,581	$ 10,100
Forward-Starting Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	4,800		$ 4,800
Cross-currency Swap Agreements | Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 469,200		$ 469,200

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Derivative Instruments and Hedging Activities - Net Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Apr. 30, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset, current	$ 1,459		$ 2,606
Derivative asset, noncurrent	26,827		48,790
Derivative liability, noncurrent	$ 4,540
Derivative liability, noncurrent			489
Derivative liability, statement of financial position [Extensible Enumeration]	Accrued expenses and other current liabilities (includes current portion of operating lease liabilities), Other Long-term Liabilities
Derivative asset, current, statement of financial position [Extensible Enumeration]	Prepaid expenses and other
Derivative liability, noncurrent, statement of financial position [Extensible Enumeration]	Other Long-term Liabilities
Derivative asset, statement of financial position [Extensible Enumeration]	Prepaid expenses and other, Assets, Noncurrent, Excluding Property, Plant and Equipment, Net
Derivative asset, noncurrent, statement of financial position [Extensible Enumeration]	Assets, Noncurrent, Excluding Property, Plant and Equipment, Net
Cash Flow Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	$ 6,852		12,995
Derivative Liabilities	0		489
Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	21,434		38,401
Derivative Liabilities	4,540		$ 0
Cumulative net gain in cross-currency swaps	37,645
Interest rate swap agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gain in AOCI	14,433
Interest Rate Swap, Terminated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gain in AOCI	7,581	$ 10,100
Cross-currency swap agreements (excluded component) | Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gain in cross-currency swaps	$ 20,751

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Derivative Instruments and Hedging Activities - (Losses) Gains (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Cross-currency swap agreements (excluded component)
Derivative [Line Items]
Net investment hedge, currency swap agreements	$ 5,817	$ 0	$ 11,651	$ 0
Cross-currency swap agreements (excluded component) | Net Investment Hedges
Derivative [Line Items]
(Losses) gains recognized	(5,817)	0	(11,651)	0
Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Cash flow hedge, interest rate swap agreements	7,896	3,932	4,454	15,402
Designated as Hedging Instrument | Interest rate swap agreements | Cash Flow Hedges
Derivative [Line Items]
(Losses) gains recognized	2,527	0	2,527	0
Designated as Hedging Instrument | Cross-currency swap agreements
Derivative [Line Items]
Cross-currency swap agreements	$ (12,704)	$ 30,279	$ (21,507)	$ 35,575

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Debt (Details) - USD ($)		6 Months Ended
	May 15, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 11,332,500,000		$ 10,650,265,000
Net Deferred Financing Costs		(85,688,000)		(81,270,000)
CARRYING AMOUNT		11,246,812,000		10,568,995,000
Debt, current portion		(102,582,000)		(87,546,000)
Unamortized debt issuance expense, net of current portion		0		0
Carrying amount, current maturities		(102,582,000)		(87,546,000)
Long term debt, gross, net of current portion		11,229,918,000		10,562,719,000
Unamortized deferred financing costs, noncurrent		(85,688,000)		(81,270,000)
Carrying amount, excluding current maturities		11,144,230,000		10,481,449,000
Net proceeds from sale of senior note		990,000,000	$ 0
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding		40,410,000
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		679,500,000		1,072,200,000
Net Deferred Financing Costs		(5,332,000)		(6,790,000)
CARRYING AMOUNT		674,168,000		1,065,410,000
FAIR VALUE		679,500,000		$ 1,072,200,000
Remaining capacity		$ 1,566,061,000
Weighted average interest rate (as a percent)		7.00%		6.20%
Letters of credit outstanding		$ 4,439,000
Credit Agreement | UK Bilateral Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		177,277,000		$ 169,361,000
Net Deferred Financing Costs		0		0
CARRYING AMOUNT		177,277,000		169,361,000
FAIR VALUE		177,277,000		169,361,000
Australian Dollar Term Loan
Debt Instrument [Line Items]
Debt (inclusive of discount)		196,333,000		202,641,000
Net Deferred Financing Costs		(543,000)		(633,000)
CARRYING AMOUNT		195,790,000		202,008,000
FAIR VALUE		198,005,000		204,623,000
Real Estate Mortgages, Financing Lease Liabilities and Other
Debt Instrument [Line Items]
Debt (inclusive of discount)		457,724,000		425,777,000
Net Deferred Financing Costs		(483,000)		(578,000)
CARRYING AMOUNT		457,241,000		425,199,000
FAIR VALUE		457,724,000		425,777,000
Term Loan A | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		234,375,000		240,625,000
Net Deferred Financing Costs		0		0
CARRYING AMOUNT		234,375,000		240,625,000
FAIR VALUE		234,375,000		240,625,000
Term Loan B | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		662,685,000		666,073,000
Net Deferred Financing Costs		(3,122,000)		(3,747,000)
CARRYING AMOUNT		659,563,000		662,326,000
FAIR VALUE		$ 663,250,000		666,750,000
37/8% GBP Senior Notes due 2025 (the "GBP Notes") | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		3.875%
Debt (inclusive of discount)		$ 506,506,000		483,888,000
Net Deferred Financing Costs		(2,231,000)		(2,589,000)
CARRYING AMOUNT		504,275,000		481,299,000
FAIR VALUE		$ 472,474,000		445,206,000
47/8% Senior Notes due 2027 (the "47/8% Notes due 2027") | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.875%
Debt (inclusive of discount)		$ 1,000,000,000		1,000,000,000
Net Deferred Financing Costs		(6,043,000)		(6,754,000)
CARRYING AMOUNT		993,957,000		993,246,000
FAIR VALUE		$ 932,500,000		917,500,000
51/4% Senior Notes due 2028 (the “51/4% Notes due 2028”) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.25%
Debt (inclusive of discount)		$ 825,000,000		825,000,000
Net Deferred Financing Costs		(5,609,000)		(6,200,000)
CARRYING AMOUNT		819,391,000		818,800,000
FAIR VALUE		$ 770,344,000		754,875,000
5% Senior Notes due 2028 (the “5% Notes due 2028”) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.00%
Debt (inclusive of discount)		$ 500,000,000		500,000,000
Net Deferred Financing Costs		(3,678,000)		(4,039,000)
CARRYING AMOUNT		496,322,000		495,961,000
FAIR VALUE		$ 461,250,000		450,000,000
7% Senior Notes due 2029 (the "7% Notes due 2029") | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		7.00%
Debt (inclusive of discount)		$ 1,000,000,000		0
Net Deferred Financing Costs		(11,853,000)		0
CARRYING AMOUNT		988,147,000		0
FAIR VALUE		$ 992,500,000		0
Principal amount	$ 1,000,000,000
Net proceeds from sale of senior note	$ 990,000,000
Principal amount percentage	100.00%
47/8% Senior Notes due 2029 (the “47/8% Notes due 2029”) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.875%
Debt (inclusive of discount)		$ 1,000,000,000		1,000,000,000
Net Deferred Financing Costs		(9,041,000)		(9,764,000)
CARRYING AMOUNT		990,959,000		990,236,000
FAIR VALUE		$ 892,500,000		865,000,000
51/4% Senior Notes due 2030 (the “51/4 Notes due 2030”) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.25%
Debt (inclusive of discount)		$ 1,300,000,000		1,300,000,000
Net Deferred Financing Costs		(10,655,000)		(11,407,000)
CARRYING AMOUNT		1,289,345,000		1,288,593,000
FAIR VALUE		$ 1,166,750,000		1,111,500,000
41/2% Senior Notes due 2031 (the “41/2% Notes”) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.50%
Debt (inclusive of discount)		$ 1,100,000,000		1,100,000,000
Net Deferred Financing Costs		(9,539,000)		(10,161,000)
CARRYING AMOUNT		1,090,461,000		1,089,839,000
FAIR VALUE		$ 940,500,000		891,000,000
5% Senior Notes due 2032 (the "5% Notes due 2032") | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.00%
Debt (inclusive of discount)		$ 750,000,000		750,000,000
Net Deferred Financing Costs		(11,858,000)		(12,511,000)
CARRYING AMOUNT		738,142,000		737,489,000
FAIR VALUE		$ 645,000,000		622,500,000
55/8% Senior Notes due 2032 (the "55/8% Notes") | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.625%
Debt (inclusive of discount)		$ 600,000,000		600,000,000
Net Deferred Financing Costs		(5,275,000)		(5,566,000)
CARRYING AMOUNT		594,725,000		594,434,000
FAIR VALUE		535,500,000		520,500,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Debt (inclusive of discount)		343,100,000		314,700,000
Net Deferred Financing Costs		(426,000)		(531,000)
CARRYING AMOUNT		342,674,000		314,169,000
FAIR VALUE		$ 343,100,000		$ 314,700,000

XML

Debt - Accounts Receivable Securitization Program Narrative (Details) - USD ($)	Jun. 30, 2023	Jun. 08, 2023	Jun. 07, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding borrowings	$ 11,332,500,000			$ 10,650,265,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 360,000,000	$ 325,000,000
Outstanding borrowings	$ 343,100,000			$ 314,700,000
Effective interest rate (as a percent)	6.20%

XML

Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Insurance settlement
Commitments and Contingencies
Reasonably possible additional losses	$ 18,000

XML

Stockholders' Equity Matters (Details) - USD ($) $ / shares in Units, $ in Thousands														3 Months Ended		6 Months Ended
	Aug. 03, 2023	Jul. 06, 2023	May 04, 2023	Apr. 05, 2023	Feb. 23, 2023	Jan. 05, 2023	Nov. 03, 2022	Oct. 04, 2022	Aug. 04, 2022	Jul. 06, 2022	Apr. 28, 2022	Apr. 06, 2022	Feb. 24, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Instrument [Line Items]
Dividend per share (in dollars per share)			$ 0.6185		$ 0.6185		$ 0.6185		$ 0.6185		$ 0.6185		$ 0.6185
TOTAL AMOUNT				$ 180,339		$ 179,866		$ 179,790		$ 179,781		$ 179,661		$ 182,113	$ 181,197	$ 365,385	$ 362,220
Subsequent Event
Debt Instrument [Line Items]
Dividend per share (in dollars per share)	$ 0.65
TOTAL AMOUNT		$ 180,493

XML

Segment Information - Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total Revenues	$ 1,357,936	$ 1,289,534	$ 2,672,285	$ 2,537,580
Adjusted EBITDA	475,658	454,706	936,466	885,700
Global RIM Business
Segment Reporting Information [Line Items]
Total Revenues	1,159,867	1,070,476	2,286,393	2,119,367
Adjusted EBITDA	499,062	469,368	976,846	918,163
Global Data Center Business
Segment Reporting Information [Line Items]
Total Revenues	118,033	100,088	230,338	197,075
Adjusted EBITDA	53,809	42,307	104,444	84,284
Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	80,036	118,970	155,554	221,138
Adjusted EBITDA	$ (77,213)	$ (56,969)	$ (144,824)	$ (116,747)

XML

Segment Information - Reconciliation to of Net Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reconciliation to of Net Income to Adjusted EBITDA
Net Income (Loss)	$ 1,143	$ 201,858	$ 66,678	$ 243,565
Interest expense, net	144,178	115,057	281,347	229,499
Provision (benefit) for income taxes	4,255	18,083	21,013	28,163
Depreciation and amortization	195,367	178,254	377,461	361,869
Acquisition and Integration Costs	1,511	16,878	3,106	32,539
Restructuring and other transformation	45,588	0	82,501	0
(Gain) loss on disposal/write-down of property, plant and equipment, net (including real estate)	(1,505)	(51,249)	(14,566)	(51,954)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	58,694	(46,103)	76,185	7,412
Stock-based compensation expense	22,373	20,256	34,882	31,597
Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures	4,054	1,672	7,859	3,010
Adjusted EBITDA	$ 475,658	$ 454,706	$ 936,466	$ 885,700

XML

Segment Information - Revenues by Product and Service Lines by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total Revenues	$ 1,357,936	$ 1,289,534	$ 2,672,285	$ 2,537,580
GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	1,159,867	1,070,476	2,286,393	2,119,367
GLOBAL DATA CENTER BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	118,033	100,088	230,338	197,075
CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	80,036	118,970	155,554	221,138
Records Management
Segment Reporting Information [Line Items]
Total Revenues	936,043	855,134	1,838,379	1,689,585
Records Management | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	898,634	818,993	1,766,622	1,621,546
Records Management | GLOBAL DATA CENTER BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Records Management | CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	37,409	36,141	71,757	68,039
Data Management
Segment Reporting Information [Line Items]
Total Revenues	130,251	124,394	259,845	258,050
Data Management | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	130,251	124,394	259,845	258,050
Data Management | GLOBAL DATA CENTER BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Data Management | CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Information Destruction
Segment Reporting Information [Line Items]
Total Revenues	173,609	209,918	343,723	392,870
Information Destruction | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	130,982	127,089	259,926	239,771
Information Destruction | GLOBAL DATA CENTER BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Information Destruction | CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	42,627	82,829	83,797	153,099
Data Center
Segment Reporting Information [Line Items]
Total Revenues	118,033	100,088	230,338	197,075
Data Center | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Data Center | GLOBAL DATA CENTER BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	118,033	100,088	230,338	197,075
Data Center | CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	$ 0	$ 0	$ 0	$ 0

XML

Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Total Revenues	$ 1,357,936	$ 1,289,534	$ 2,672,285	$ 2,537,580
Co-venturer | Frankfurt JV
Related Party Transaction [Line Items]
Total Revenues	800	5,700	1,700	12,800
Co-venturer | MakeSpace JV and Clutter JV
Related Party Transaction [Line Items]
Total Revenues	$ 7,000	$ 7,400	$ 13,000	$ 14,400

XML

Restructuring And Other Transformation - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and other transformation	$ 45,588,000	$ 0	$ 82,501,000	$ 0
Accrued restructuring	7,400,000		7,400,000		$ 7,400,000
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Accrued transformation costs	22,200,000		22,200,000		22,200,000
Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Expected cost						$ 150,000
Restructuring and other transformation	$ 45,588,000	$ 0	$ 82,501,000	$ 0	$ 124,434,000

XML

Restructuring And Other Transformation - Restructuring Charges (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and other transformation	$ 45,588,000	$ 0	$ 82,501,000	$ 0
Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Restructuring	16,127,000		28,084,000		$ 41,376,000
Other transformation	29,461,000		54,417,000		83,058,000
Restructuring and other transformation	45,588,000	$ 0	82,501,000	$ 0	124,434,000
GLOBAL RIM BUSINESS | Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Restructuring	15,000,000		24,525,000		37,608,000
Other transformation	4,958,000		8,443,000		12,344,000
GLOBAL DATA CENTER BUSINESS | Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Restructuring	0		78,000		78,000
Other transformation	498,000		1,368,000		1,426,000
CORPORATE AND OTHER | Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Restructuring	1,127,000		3,481,000		3,690,000
Other transformation	$ 24,005,000		$ 44,606,000		$ 69,288,000