Iron Mountain (IRM) 10-Q 1 Aug 24 2024 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2024	Jul. 26, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
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		293,335,826
Entity Central Index Key	0001020569
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 144,256	$ 222,789
Accounts receivable (less allowances of $78,513 and $74,762 as of June 30, 2024 and December 31, 2023, respectively)	1,273,900	1,259,826
Prepaid expenses and other	295,583	252,930
Total Current Assets	1,713,739	1,735,545
Property, Plant and Equipment:
Property, plant and equipment	10,976,919	10,373,989
Less—Accumulated depreciation	(4,183,895)	(4,059,120)
Property, Plant and Equipment, Net	6,793,024	6,314,869
Other Assets, Net:
Goodwill	5,099,772	5,017,912
Customer and supplier relationships and other intangible assets	1,284,339	1,279,800
Operating lease right-of-use assets	2,593,461	2,696,024
Other	482,599	429,652
Total Other Assets, Net	9,460,171	9,423,388
Total Assets	17,966,934	17,473,802
Current Liabilities:
Current portion of long-term debt	125,409	120,670
Accounts payable	527,968	539,594
Accrued expenses and other current liabilities (includes current portion of operating lease liabilities)	1,174,979	1,250,259
Deferred revenue	329,718	325,665
Total Current Liabilities	2,158,074	2,236,188
Long-term Debt, net of current portion	12,814,166	11,812,500
Long-term Operating Lease Liabilities, net of current portion	2,453,935	2,562,394
Other Long-term Liabilities	257,497	237,590
Deferred Income Taxes	231,150	235,410
Commitments and Contingencies
Redeemable Noncontrolling Interests	184,861	177,947
Iron Mountain Incorporated Stockholders' (Deficit) 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 293,298,465 and 292,142,739 shares as of June 30, 2024 and December 31, 2023, respectively)	2,933	2,921
Additional paid-in capital	4,555,883	4,533,691
(Distributions in excess of earnings) Earnings in excess of distributions	(4,230,599)	(3,953,808)
Accumulated other comprehensive items, net	(461,091)	(371,156)
Total Iron Mountain Incorporated Stockholders' (Deficit) Equity	(132,874)	211,648
Noncontrolling Interests	125	125
Total (Deficit) Equity	(132,749)	211,773
Total Liabilities and (Deficit) Equity	$ 17,966,934	$ 17,473,802

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 78,513	$ 74,762
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)	293,298,465	292,142,739
Common stock, outstanding shares (in shares)	293,298,465	292,142,739

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues:
Total Revenues	$ 1,534,409	$ 1,357,936	$ 3,011,272	$ 2,672,285
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	675,971	592,644	1,329,226	1,164,270
Selling, general and administrative	344,838	311,805	664,303	606,325
Depreciation and amortization	224,501	195,367	434,056	377,461
Acquisition and Integration Costs	9,502	1,511	17,311	3,106
Restructuring and other transformation	46,513	45,588	87,280	82,501
Loss (Gain) on disposal/write-down of property, plant and equipment, net	2,790	(1,505)	3,179	(14,566)
Total Operating Expenses	1,304,115	1,145,410	2,535,355	2,219,097
Operating Income (Loss)	230,294	212,526	475,917	453,188
Interest Expense, Net	176,521	144,178	341,040	281,347
Other Expense (Income), Net	5,833	62,950	(6,697)	84,150
Net Income (Loss) Before Provision (Benefit) for Income Taxes	47,940	5,398	141,574	87,691
Provision (Benefit) for Income Taxes	13,319	4,255	29,928	21,013
Net Income (Loss)	34,621	1,143	111,646	66,678
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(1,162)	1,029	1,802	1,969
Net Income (Loss) Attributable to Iron Mountain Incorporated	$ 35,783	$ 114	$ 109,844	$ 64,709
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic (in dollars per share)	$ 0.12	$ 0	$ 0.37	$ 0.22
Diluted (in dollars per share)	$ 0.12	$ 0	$ 0.37	$ 0.22
Weighted average common shares outstanding-basic (in shares)	293,340,000	291,825,000	293,043,000	291,633,000
Weighted average common shares outstanding-diluted (in shares)	295,838,000	293,527,000	295,529,000	293,288,000
Storage rental
Revenues:
Total Revenues	$ 919,746	$ 830,756	$ 1,804,588	$ 1,640,845
Service
Revenues:
Total Revenues	$ 614,663	$ 527,180	$ 1,206,684	$ 1,031,440

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Interest income	$ 0	$ 2,290	$ 3,425	$ 5,197

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 34,621	$ 1,143	$ 111,646	$ 66,678
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	(31,579)	18,035	(98,848)	58,261
Change in Fair Value of Derivative Instruments	(488)	7,896	10,900	4,454
Reclassifications from Accumulated Other Comprehensive Items, net	0	(2,527)	(2,528)	(2,527)
Total Other Comprehensive (Loss) Income:	(32,067)	23,404	(90,476)	60,188
Comprehensive Income (Loss)	2,554	24,547	21,170	126,866
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(935)	909	1,261	2,398
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 3,489	$ 23,638	$ 19,909	$ 124,468

CONDENSED CONSOLIDATED STATEM_4

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, 2022	$ 636,793	$ 2,908	$ 4,468,035	$ (3,392,272)	$ (442,003)	$ 125
Beginning balance (in shares) at Dec. 31, 2022		290,830,296,000
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase 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)		994,662,000
Changes in equity related to redeemable noncontrolling interests	1,367		1,367				$ (1,367)
Parent cash dividends declared	(365,385)			(365,385)
Other comprehensive (loss) income	59,759				59,759
Net income (loss)	64,709			64,709
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		291,824,958,000
Beginning of redeemable noncontrolling interest at Dec. 31, 2022							95,160
Increase (Decrease) in Temporary Equity [Roll Forward]
Changes in equity related to redeemable noncontrolling interests	1,367		1,367				(1,367)
Other comprehensive (loss) income							429
Net income (loss)							1,969
Noncontrolling interests equity contributions							9,900
Noncontrolling interests dividends							(2,032)
Ending of redeemable noncontrolling interest at Jun. 30, 2023							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		291,584,999,000
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase 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)		239,959,000
Changes in equity related to redeemable noncontrolling interests	1,367		1,367				(1,367)
Parent cash dividends declared	(182,113)			(182,113)
Other comprehensive (loss) income	23,524				23,524
Net income (loss)	114			114
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		291,824,958,000
Beginning of redeemable noncontrolling interest at Mar. 31, 2023							95,630
Increase (Decrease) in Temporary Equity [Roll Forward]
Changes in equity related to redeemable noncontrolling interests	1,367		1,367				(1,367)
Other comprehensive (loss) income							(120)
Net income (loss)							1,029
Noncontrolling interests equity contributions							9,900
Noncontrolling interests dividends							(1,013)
Ending of redeemable noncontrolling interest at Jun. 30, 2023							104,059
Beginning of Period at Dec. 31, 2023	$ 211,773	$ 2,921	4,533,691	(3,953,808)	(371,156)	125
Beginning balance (in shares) at Dec. 31, 2023	292,142,739	292,142,739,000
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase and option plans and stock-based compensation	$ 21,782	$ 12	21,770
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		1,155,726,000
Changes in equity related to redeemable noncontrolling interests	422		422				6,862
Parent cash dividends declared	(386,635)			(386,635)
Other comprehensive (loss) income	(89,935)				(89,935)
Net income (loss)	109,844			109,844
End of Period at Jun. 30, 2024	$ (132,749)	$ 2,933	4,555,883	(4,230,599)	(461,091)	125
Ending balance (in shares) at Jun. 30, 2024	293,298,465	293,298,465,000
Beginning of redeemable noncontrolling interest at Dec. 31, 2023	$ 177,947						177,947
Increase (Decrease) in Temporary Equity [Roll Forward]
Changes in equity related to redeemable noncontrolling interests	422		422				6,862
Other comprehensive (loss) income							(541)
Net income (loss)							1,802
Noncontrolling interests dividends							(1,209)
Ending of redeemable noncontrolling interest at Jun. 30, 2024	184,861						184,861
Beginning of Period at Mar. 31, 2024	18,660	$ 2,931	4,518,644	(4,074,243)	(428,797)	125
Beginning balance (in shares) at Mar. 31, 2024		293,085,683,000
Increase (Decrease) in Stockholders' Equity
Issuance and net settlement of shares under employee stock purchase and option plans and stock-based compensation	37,241	$ 2	37,239
Issuance and net settlement of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		212,782,000
Changes in equity related to redeemable noncontrolling interests							7,284
Parent cash dividends declared	(192,139)			(192,139)
Other comprehensive (loss) income	(32,294)				(32,294)
Net income (loss)	35,783			35,783
End of Period at Jun. 30, 2024	$ (132,749)	$ 2,933	$ 4,555,883	$ (4,230,599)	$ (461,091)	$ 125
Ending balance (in shares) at Jun. 30, 2024	293,298,465	293,298,465,000
Beginning of redeemable noncontrolling interest at Mar. 31, 2024							179,222
Increase (Decrease) in Temporary Equity [Roll Forward]
Changes in equity related to redeemable noncontrolling interests							7,284
Other comprehensive (loss) income							227
Net income (loss)							(1,162)
Noncontrolling interests dividends							(710)
Ending of redeemable noncontrolling interest at Jun. 30, 2024	$ 184,861						$ 184,861

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows from Operating Activities:
Net income (loss)	$ 111,646	$ 66,678
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation	302,562	254,395
Amortization (includes amortization of deferred financing costs and discounts of $12,243 and $8,095 for the six months ended June 30, 2024 and 2023, respectively)	143,737	131,161
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	2,798	3,491
Stock-based compensation expense	43,928	34,882
(Benefit) provision for deferred income taxes	(442)	2,799
Loss (gain) on disposal/write-down of property, plant and equipment, net	3,179	(14,566)
Loss associated with the Clutter Acquisition	0	38,000
Foreign currency transactions and other, net	12,655	69,183
(Increase) decrease in assets	(86,117)	(31,071)
(Decrease) increase in liabilities	(21,731)	(108,858)
Cash Flows from Operating Activities	512,215	446,094
Cash Flows from Investing Activities:
Capital expenditures	(777,901)	(600,758)
Cash paid for acquisitions, net of cash acquired	(123,323)	(21,465)
Customer inducements	(3,457)	(2,630)
Contract costs	(50,800)	(39,989)
Investments in joint ventures and other investments, net	(10,190)	(15,830)
Proceeds from sales of property and equipment and other, net	5,923	35,390
Cash Flows from Investing Activities	(959,748)	(645,282)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(4,896,450)	(10,087,033)
Proceeds from revolving credit facility, term loan facilities and other debt	5,843,362	9,683,880
Net proceeds from sale of senior note	0	990,000
Debt financing and equity contribution from noncontrolling interests	0	9,900
Equity distribution to noncontrolling interests	(1,209)	(2,032)
Parent cash dividends	(388,709)	(367,060)
Payment of deferred purchase obligation	(158,677)	0
Net (payments) proceeds associated with employee stock-based awards	(22,146)	(15,782)
Other, net	(6,880)	(2,046)
Cash Flows from Financing Activities	369,291	209,827
Effect of Exchange Rates on Cash and Cash Equivalents	(291)	(2,943)
(Decrease) increase in Cash and Cash Equivalents	(78,533)	7,696
Cash and Cash Equivalents, Beginning of Period	222,789	141,797
Cash and Cash Equivalents, End of Period	144,256	149,493
Supplemental Information:
Cash Paid for Interest	382,823	270,146
Cash Paid for Income Taxes, Net	43,099	46,502
Non-Cash Investing and Financing Activities:
Financing Leases and Other	67,996	61,085
Accrued Capital Expenditures	213,636	192,197
Deferred Purchase Obligations and Other Deferred Payments	133,813	9,290
Dividends Payable	$ 200,318	$ 192,597

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Statement of Cash Flows [Abstract]
Deferred financing costs and discount included in amortization	$ 12,243	$ 8,095

General

General	6 Months Ended
	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	GENERAL The unaudited condensed consolidated financial statements of Iron Mountain Incorporated, a Delaware corporation, 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. 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, 2023 included in our Annual Report on Form 10-K filed with the SEC on February 22, 2024 (our "Annual Report"). In September 2022, we announced a global program designed to accelerate the growth of our business ("Project Matterhorn"). See Note 11.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2024
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, 2024 is as follows: Balance as of December 31, 2023 $ 74,762 Credit memos charged to revenue 44,137 Allowance for bad debts charged to expense 24,233 Deductions and other (1) (64,619) Balance as of June 30, 2024 $ 78,513 (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, 2024 and December 31, 2023 are as follows: DESCRIPTION JUNE 30, 2024 DECEMBER 31, 2023 Assets: Operating lease right-of-use assets $ 2,593,461 $ 2,696,024 Financing lease right-of-use assets, net of accumulated depreciation (1) 340,842 304,600 Liabilities: Current Operating lease liabilities $ 302,234 $ 291,795 Financing lease liabilities (1) 42,260 39,089 Long-term Operating lease liabilities $ 2,453,935 $ 2,562,394 Financing lease liabilities (1) 336,653 310,776 (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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DESCRIPTION 2024 2023 2024 2023 Operating lease cost (1) $ 172,735 $ 161,241 $ 344,481 $ 317,114 Financing lease cost: Depreciation of financing lease right-of-use assets $ 12,078 $ 10,202 $ 23,022 $ 20,210 Interest expense for financing lease liabilities 5,217 4,416 10,438 8,757 (1) Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $39,594 and $77,688 for the three and six months ended June 30, 2024, respectively, and $34,418 and $65,998 for the three and six months ended June 30, 2023, respectively. Other information: Supplemental cash flow information relating to our leases for the six months ended June 30, 2024 and 2023 is as follows: SIX MONTHS ENDED JUNE 30, CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES: 2024 2023 Operating cash flows used in operating leases $ 235,030 $ 220,764 Operating cash flows used in financing leases (interest) 10,438 8,757 Financing cash flows used in financing leases 21,536 22,010 NON-CASH ITEMS: Operating lease modifications and reassessments $ 573 $ 44,779 New operating leases (including acquisitions and sale-leaseback transactions) 80,474 163,326 D. GOODWILL Our reporting units as of December 31, 2023 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 and Corporate and Other (as defined in Note 9) for the six months ended June 30, 2024 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, 2023 $ 3,911,945 $ 478,930 $ 627,037 $ 5,017,912 Tax deductible goodwill acquired during the period — — 131,790 131,790 Fair value and other adjustments 963 (186) (186) 591 Currency effects (45,888) (3,928) (705) (50,521) Goodwill balance, net of accumulated amortization, as of June 30, 2024 $ 3,867,020 $ 474,816 $ 757,936 $ 5,099,772 Accumulated goodwill impairment balance as of June 30, 2024 $ 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, 2024 and December 31, 2023 are as follows: FAIR VALUE MEASUREMENTS AT JUNE 30, 2024 USING DESCRIPTION TOTAL CARRYING VALUE AT JUNE 30, 2024 QUOTED PRICES IN SIGNIFICANT OTHER SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) (2) Money Market Funds $ 10,218 $ — $ 10,218 $ — Time Deposits 20,762 — 20,762 — Trading Securities 8,841 7,166 1,675 — Derivative Assets 25,607 — 25,607 — Derivative Liabilities 2,670 — 2,670 — Deferred Purchase Obligations (1) 114,703 — — 114,703 FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2023 USING DESCRIPTION TOTAL CARRYING VALUE AT DECEMBER 31, 2023 QUOTED PRICES IN SIGNIFICANT OTHER SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) (2) Money Market Funds $ 66,008 $ — $ 66,008 $ — Time Deposits 15,913 — 15,913 — Trading Securities 9,952 6,149 3,803 — Derivative Assets 6,359 — 6,359 — Derivative Liabilities 5,769 — 5,769 — Deferred Purchase Obligations (1) 208,265 — — 208,265 (1) Primarily relates to the fair values of the deferred purchase obligations associated with the ITRenew Transaction (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) and the Regency Transaction (as defined in Note 3). (2) The following is a rollforward of the Level 3 liabilities presented above for December 31, 2023 through June 30, 2024: Balance as of December 31, 2023 $ 208,265 Additions 63,700 Payments (158,677) Other changes, including accretion 1,415 Balance as of June 30, 2024 $ 114,703 The level 3 valuations of the deferred purchase obligations were determined utilizing Monte-Carlo models and take into account our forecasted projections as they relate to the underlying performance of the respective businesses. The Monte-Carlo simulation model applied in assessing the fair value of the deferred purchase obligation associated with the ITRenew Transaction incorporates assumptions as to expected gross profits over the 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 arrangement and overall market risks. The Monte-Carlo simulation model applied in assessing the fair value of the deferred purchase obligation associated with the Regency Transaction incorporates assumptions as to expected revenue over the achievement period, including adjustments for volatility and timing, as well as discount rates that account for the risk of the arrangement and overall market risks. Any material change to these assumptions may result in a significantly higher or lower fair value of the related deferred purchase obligation. There were no material items that were measured at fair value on a non-recurring basis at June 30, 2024 and December 31, 2023 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, 2024 (see Note 3), both 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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, 2024 THREE MONTHS ENDED JUNE 30, 2023 FOREIGN DERIVATIVE FINANCIAL TOTAL FOREIGN DERIVATIVE FINANCIAL TOTAL Beginning of Period $ (440,129) $ 11,332 $ (428,797) $ (414,832) $ 9,064 $ (405,768) Other comprehensive (loss) income: Foreign currency translation and other adjustments (31,806) — (31,806) 18,155 — 18,155 Change in fair value of derivative instruments — (488) (488) — 7,896 7,896 Reclassifications from accumulated other comprehensive items, net — — — — (2,527) (2,527) Total other comprehensive (loss) income (31,806) (488) (32,294) 18,155 5,369 23,524 End of Period $ (471,935) $ 10,844 $ (461,091) $ (396,677) $ 14,433 $ (382,244) G. REVENUES The costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to fulfill or obtain customer contracts (collectively, "Contract Costs"). Contract Costs as of June 30, 2024 and December 31, 2023 are as follows: JUNE 30, 2024 DECEMBER 31, 2023 GROSS ACCUMULATED NET GROSS ACCUMULATED NET Intake Costs asset $ 77,922 $ (38,683) $ 39,239 $ 76,150 $ (39,617) $ 36,533 Commissions asset 178,289 (67,801) 110,488 156,639 (64,279) 92,360 Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows: DESCRIPTION LOCATION IN BALANCE SHEET JUNE 30, 2024 DECEMBER 31, 2023 Deferred revenue - Current Deferred revenue $ 329,718 $ 325,665 Deferred revenue - Long-term Other Long-term Liabilities 95,605 100,770 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 842, Leases . Storage rental revenue associated with our Global Data Center Business for the three and six months ended June 30, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Storage rental revenue $ 147,397 $ 110,990 $ 287,425 $ 218,425 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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Stock-based compensation expense $ 29,889 $ 22,373 $ 43,928 $ 34,882 During the six months ended June 30, 2024, we granted approximately 83,100 stock options, 644,200 RSUs and 450,700 PUs under the 2014 Plan (as defined in Note 2.t to Notes to Consolidated Financial Statements included in our Annual Report). As of June 30, 2024, unrecognized compensation cost related to the unvested po 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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Acquisition and Integration Costs $ 9,502 $ 1,511 $ 17,311 $ 3,106 J. LOSS (GAIN) ON DISPOSAL/WRITE-DOWN OF PROPERTY, PLANT AND EQUIPMENT, NET Loss (gain) on disposal/write-down of property, plant and equipment, net for the three and six months ended June 30, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 (1) Loss (gain) on disposal/write-down of property, plant and equipment, net $ 2,790 $ (1,505) $ 3,179 $ (14,566) (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 2023. The gains recognized during 2023 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, 2024 and 2023 consists of the following: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DESCRIPTION 2024 2023 2024 2023 Foreign currency transaction losses (gains), net (1) $ 1,013 $ 15,063 $ (15,366) $ 29,487 Other, net (2) 4,820 47,887 8,669 54,663 Other Expense (Income), Net $ 5,833 $ 62,950 $ (6,697) $ 84,150 (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 $38,000 associated with the remeasurement to fair value of our previously held equity interest in the Clutter JV (as defined and discussed in Note 10) as well as 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). 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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 (1) 2023 (2) 2024 2023 (2) Effective Tax Rate 27.8 % 78.8 % 21.1 % 24.0 % (1) The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended June 30, 2024 were the lack of tax benefits recognized for the year to date ordinary losses of certain entities, the benefits derived from the dividends paid deduction and 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, 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. 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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Net Income (Loss) $ 34,621 $ 1,143 $ 111,646 $ 66,678 Less: Net (Loss) Income Attributable to Noncontrolling Interests (1,162) 1,029 1,802 1,969 Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 35,783 $ 114 $ 109,844 $ 64,709 Weighted-average shares—basic 293,340,000 291,825,000 293,043,000 291,633,000 Effect of dilutive potential stock options 2,068,000 1,322,000 1,977,000 1,269,000 Effect of dilutive potential RSUs and PUs 430,000 380,000 509,000 386,000 Weighted-average shares—diluted 295,838,000 293,527,000 295,529,000 293,288,000 Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated: Basic $ 0.12 $ 0.00 $ 0.37 $ 0.22 Diluted $ 0.12 $ 0.00 $ 0.37 $ 0.22 Antidilutive stock options, RSUs and PUs excluded from the calculation 506,149 157,132 435,957 151,431

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions	ACQUISITIONS REGENCY TECHNOLOGIES On January 3, 2024, in order to expand our asset lifecycle management ("ALM") business, we acquired 100% of RSR Partners, LLC (doing business as Regency Technologies), an information technology asset disposition services provider with operations throughout the United States, for an initial purchase price of approximately $200,000, subject to certain working capital adjustments at, and subsequent to, the closing, with $125,000 paid at closing, funded by borrowings under the Revolving Credit Facility (as defined in Note 6), and the remaining $75,000 (the “January 2025 Payment”) to be paid in January 2025 (the "Regency Transaction"). The present value of the January 2025 Payment is included as a component of Accrued expenses and other current liabilities in our Condensed Consolidated Balance Sheet at June 30, 2024. The agreement for the Regency Transaction also includes a performance-based contingent consideration with a potential earnout range from zero to $200,000 based upon achievement of certain three-year cumulative revenue targets, which would be payable in 2027, if earned (the “Regency Deferred Purchase Obligation”). The preliminary fair value estimate of the Regency Deferred Purchase Obligation as of the acquisition date was approximately $78,400. See Note 2.e. for details on the methodology used to establish the fair value. The fair value of the Regency Deferred Purchase Obligation is included as a component of Other long-term liabilities in our Condensed Consolidated Balance Sheet at June 30, 2024. Subsequent increases or decreases in the fair value estimate of the Regency Deferred Purchase Obligation, as well as the accretion of the discount to present value, is included as a component of Other expense (income), net in our Condensed Consolidated Statements of Operations until the deferred purchase obligation is settled or paid. Subsequent to the acquisition, the results of Regency Technologies are included as a component of Corporate and Other. WEB WERKS On July 1, 2024, we entered into an agreement with the minority shareholders of Web Werks India Private Limited to acquire the remaining interest in the Web Werks JV (as defined in Note 5 to Notes to Consolidated Financial Statements included in our Annual Report). Pursuant to the agreement, we will acquire the remaining approximately 36.61% interest in the Web Werks JV in two separate transactions. On July 5, 2024, we completed the acquisition of an approximately 8.55% interest in the Web Werks JV (“Tranche I”) for approximately 3,000,000 Indian rupees (or approximately $35,000, based upon the exchange rate between the United States dollar and Indian rupee on the closing date of Tranche I). During the third quarter of 2024, we will recognize a charge of approximately $17,000, which will be recorded to Other expense (income), net, representing the difference between the purchase price of Tranche I and the related liability we have recorded on our Condensed Consolidated Balance Sheet at June 30, 2024. Subsequent to the Tranche I payment, our ownership interest in the Web Werks JV is approximately 71.94%. In March 2025, we will be required to make an additional payment of approximately 9,600,000 Indian rupees (or approximately $115,000, based upon the exchange rate between the United States dollar and Indian rupee as of June 30, 2024) (“Tranche II”) to acquire the remaining approximately 28.06% interest in the Web Werks JV. As part of the Tranche II payment in March 2025, we may also make an incremental payment of approximately 1,000,000 Indian rupees (or approximately $12,000, based upon the exchange rate between the United States dollar and Indian rupee as of June 30, 2024) if certain infrastructure goals are achieved before December 31, 2024. Any difference between the fair value of the approximately 28.06% interest and the total consideration paid will be recorded to Other expense (income), net. PRELIMINARY PURCHASE PRICE ALLOCATION A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for our acquisition closed during the six months ended June 30, 2024 is as follows: SIX MONTHS ENDED JUNE 30, 2024 Cash Paid (gross of cash acquired) $ 125,844 Deferred Purchase Obligations, Purchase Price Holdbacks and Other (1) 133,813 Total Consideration 259,657 Fair Value of Identifiable Assets Acquired (2) 156,108 Fair Value of Identifiable Liabilities Acquired (28,241) Goodwill Initially Recorded (3) $ 131,790 (1) Consists of the acquisition-date fair values of the Regency Deferred Purchase Obligation and the January 2025 Payment. (2) Assets acquired include a supplier relationship intangible asset, which has a fair value of $107,500 and a weighted average life of approximately 20 years. (3) 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, 2024 relate to the final assessment of the fair value of the assets acquired and the fair value of the deferred purchase obligation, which may differ materially from these preliminary estimates associated with the acquisition closed during the six months ended June 30, 2024. Any adjustments to our estimates of purchase price allocations will be made in the periods in which the adjustments are determined, and the cumulative effect of such adjustments will be calculated as if the adjustments had been completed as of the acquisition dates. Purchase price allocation adjustments recorded during the six months ended June 30, 2024 were not material to our balance sheet or results from operations.

Investments

Investments	6 Months Ended
	Jun. 30, 2024
Investments, All Other Investments [Abstract]
Investments	INVESTMENTS JOINT VENTURE SUMMARY Our joint venture with AGC Equity Partners (the "Frankfurt JV") is accounted for as an equity method investment and is presented as a component of Other within Other assets, net in our Condensed Consolidated Balance Sheets. The carrying value and equity interest in the Frankfurt JV at June 30, 2024 and December 31, 2023 is as follows: JUNE 30, 2024 DECEMBER 31, 2023 CARRYING VALUE EQUITY INTEREST CARRYING VALUE EQUITY INTEREST Frankfurt JV $ 64,561 20 % $ 57,874 20 %

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
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 We utilize interest rate swap agreements designated as cash flow hedges to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. Certain of our interest rate swap agreements have notional amounts that will increase with the underlying hedged transaction. Under our interest rate swap agreements, we receive variable rate interest payments associated with the notional amount of each interest rate swap, based upon the one-month Secured Overnight Financing Rate ("SOFR"), in exchange for the payment of fixed interest rates as specified in the interest rate swap agreements. Our 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. As of June 30, 2024 and December 31, 2023, we have approximately $1,251,000 and $520,000, respectively, in notional value outstanding on our interest rate swap agreements, with maturity dates ranging from October 2025 through May 2027. CROSS-CURRENCY SWAP AGREEMENTS DESIGNATED AS A HEDGE OF NET INVESTMENT We utilize cross-currency swaps to hedge the variability of exchange rate impacts between the United States dollar and the Euro. As of both June 30, 2024 and December 31, 2023, we have approximately $509,200 in notional value outstanding on cross-currency interest rate swaps, with maturity dates ranging from August 2024 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 values of derivative instruments recognized in our Condensed Consolidated Balance Sheets at June 30, 2024 and December 31, 2023, by derivative instrument, are as follows: JUNE 30, 2024 DECEMBER 31, 2023 DERIVATIVE INSTRUMENTS (1) Assets Liabilities Assets Liabilities Cash Flow Hedges (2) Interest rate swap agreements $ 11,898 $ (2,670) $ 1,601 $ (3,273) Net Investment Hedges (3) Cross-currency swap agreements 13,709 — 4,758 (2,496) (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, 2024, $2,074 is included within Prepaid expenses and other, $23,533 is included within Other assets and $2,670 is included within Other long-term liabilities. As of December 31, 2023, $6,359 is included within Other assets, $2,496 is included within Accrued expenses and other current liabilities and $3,273 is included within Other long-term liabilities. (2) As of June 30, 2024, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our interest rate swap agreements are $10,844. (3) As of June 30, 2024, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our cross-currency swap agreements are $52,259, which include $38,550 related to the excluded component of our cross-currency swap agreements. Unrealized (losses) gains recognized in Accumulated other comprehensive items, net during the three and six months ended June 30, 2024 and 2023, by derivative instrument, are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DERIVATIVE INSTRUMENTS 2024 2023 2024 2023 Cash Flow Hedges Interest rate swap agreements $ (488) $ 7,896 $ 10,900 $ 4,454 Net Investment Hedges Cross-currency swap agreements 3,135 (12,704) 11,447 (21,507) Cross-currency swap agreements (excluded component) 4,177 5,817 8,353 11,651 (Losses) gains recognized in Net income (loss) during the three and six months ended June 30, 2024 and 2023, by derivative instrument, are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DERIVATIVE INSTRUMENTS Location of gain (loss) 2024 2023 2024 2023 Cash Flow Hedges Interest rate swap agreements Interest expense $ — $ 2,527 $ 2,528 $ 2,527 Net Investment Hedges Cross-currency swap agreements (excluded component) Interest expense (4,177) (5,817) (8,353) (11,651)

Debt

Debt	6 Months Ended
	Jun. 30, 2024
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt is as follows: JUNE 30, 2024 DECEMBER 31, 2023 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) $ 745,000 $ (4,065) $ 740,935 $ 745,000 $ — $ (4,621) $ (4,621) $ — Term Loan A (1) 221,875 — 221,875 221,875 228,125 — 228,125 228,125 Term Loan B due 2026 (1) 655,911 (1,874) 654,037 656,250 659,298 (2,498) 656,800 659,750 Term Loan B due 2031 (1) 1,185,635 (12,369) 1,173,266 1,194,000 1,191,000 (13,026) 1,177,974 1,200,000 Virginia 3 Term Loans (2) 221,615 (3,771) 217,844 221,615 101,218 (4,641) 96,577 101,218 Virginia 4/5 Term Loans (2) 61,513 (4,286) 57,227 61,513 16,338 (5,892) 10,446 16,338 Virginia 6 Term Loans (3) 53,825 (5,585) 48,240 53,825 — — — — Australian Dollar Term Loan (2) 191,334 (365) 190,969 192,498 197,743 (482) 197,261 199,195 UK Bilateral Revolving Credit Facility (2) 177,043 — 177,043 177,043 178,239 — 178,239 178,239 GBP Notes (2) 505,836 (1,274) 504,562 492,780 509,254 (1,763) 507,491 489,108 4 7 / 8 % Notes due 2027 (2) 1,000,000 (4,621) 995,379 962,500 1,000,000 (5,332) 994,668 967,500 5 1 / 4 % Notes due 2028 (2 825,000 (4,428) 820,572 796,125 825,000 (5,019) 819,981 800,250 5% Notes due 2028 (2) 500,000 (2,954) 497,046 477,500 500,000 (3,316) 496,684 478,750 7% Notes due 2029 (2) 1,000,000 (9,750) 990,250 1,012,500 1,000,000 (10,813) 989,187 1,027,500 4 7 / 8 % Notes due 2029 (2) 1,000,000 (7,595) 992,405 937,500 1,000,000 (8,318) 991,682 945,000 5 1 / 4 % Notes due 2030 (2) 1,300,000 (9,151) 1,290,849 1,228,500 1,300,000 (9,903) 1,290,097 1,241,500 4 1 / 2 % Notes (2) 1,100,000 (8,296) 1,091,704 990,000 1,100,000 (8,917) 1,091,083 995,500 5% Notes due 2032 (2) 750,000 (10,553) 739,447 682,500 750,000 (11,206) 738,794 684,375 5 5 / 8 % Notes (2) 600,000 (4,695) 595,305 565,500 600,000 (4,985) 595,015 567,000 Real Estate Mortgages, Financing Lease Liabilities and Other 568,267 (638) 567,629 568,267 519,907 (403) 519,504 519,907 Accounts Receivable Securitization Program (3) 373,800 (809) 372,991 373,800 358,500 (317) 358,183 358,183 Total Long-term Debt 13,036,654 (97,079) 12,939,575 12,034,622 (101,452) 11,933,170 Less Current Portion (125,409) — (125,409) (120,670) — (120,670) Long-term Debt, Net of Current Portion $ 12,911,245 $ (97,079) $ 12,814,166 $ 11,913,952 $ (101,452) $ 11,812,500 (1) Collectively, the “Credit Agreement”. The Credit Agreement consists of a revolving credit facility (the “Revolving Credit Facility”), a term loan A facility (the “Term Loan A”) and two term loan B facilities (the "Term Loan B due 2026" and the "Term Loan B due 2031"). The remaining amount available for borrowing under the Revolving Credit Facility as of June 30, 2024 was $1,496,102 (which represents the maximum availability as of such date). The weighted average interest rate in effect under the Revolving Credit Facility was 7.2% as of June 30, 2024. Due to the discontinuance of the Canadian Dollar Offered Rate reference rate on June 28, 2024, the Credit Agreement was amended on June 7, 2024 to update the interest rate benchmark available for Canadian currency borrowings under our Revolving Credit Facility to the Canadian Overnight Repo Rate Average, effective July 1, 2024. All other material terms of the Revolving Credit Facility remain the same as disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. (2) Each as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. (3) The fair value (Level 2 of fair value hierarchy described at Note 2.e.) of this debt instrument approximates the carrying value as borrowings under this debt instrument are based on a current variable market interest rate. 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, which are consistent with the levels of the fair value hierarchy used to determine the fair value of our debt as of June 30, 2024). CREDIT AGREEMENT On July 2, 2024, we amended the Credit Agreement, which resulted in (i) an increase in the principal amount of the Term Loan B due 2031 from $1,194,000 to approximately $1,806,700, (ii) a decrease in the interest rate of the Term Loan B due 2031 from SOFR plus 2.25% to SOFR plus 2.00% and (iii) a decrease in the principal amount of our Term Loan B due 2026 from approximately $656,300 to approximately $53,400. We paid original issue discount fees of approximately $4,300 in connection with this amendment. Quarterly principal payments of approximately $4,500 on the Term Loan B due 2031 will commence in September 2024. All other material terms remain the same as disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. VIRGINIA CREDIT AGREEMENTS As our Global Data Center business continues to expand, we have entered into credit agreements in order to partially finance the construction of various data centers. During the quarter ended June 30, 2024, we entered into two new agreements. These agreements primarily consist of the following term loan facilities: AGREEMENT MAXIMUM BORROWING OUTSTANDING BORROWINGS AS OF JUNE 30, 2024 DIRECT CONTRACTUAL INTEREST RATE UNUSED COMMITMENT FEE MATURITY DATE (1) Virginia 6 Term Loans (2) $ 210,000 $ 53,825 Iron Mountain Data Centers Virginia 6, LLC SOFR plus 2.75% 0.75% May 3, 2027 Virginia 7 Term Loans (3) 300,000 — Iron Mountain Data Centers Virginia 7, LLC SOFR plus 2.50% 0.75% April 12, 2027 (1) All obligations will become due on the specified maturity dates. Each agreement includes two one-year options that allow us to extend the initial maturity date, subject to the conditions specified in the agreements. (2) On May 3, 2024, Iron Mountain Data Centers Virginia 6, LLC, a wholly-owned subsidiary of Iron Mountain Data Centers Virginia 6/7 JV, LLC, entered into a credit agreement (the "Virginia 6 Credit Agreement"). The Virginia 6 Credit Agreement consists of a term loan facility (the "Virginia 6 Term Loans") and a letter of credit facility. The Virginia 6 Credit Agreement is secured by the equity interests and assets of Iron Mountain Data Centers Virginia 6, LLC. As of June 30, 2024, the interest rate in effect under the Virginia 6 Credit Agreement was 5.3%. (3) On April 12, 2024, Iron Mountain Data Centers Virginia 7, LLC, a wholly-owned subsidiary of Iron Mountain Data Centers Virginia 6/7 JV, LLC, entered into a credit agreement (the "Virginia 7 Credit Agreement"). The Virginia 7 Credit Agreement consists of a term loan facility and a letter of credit facility. The Virginia 7 Credit Agreement is secured by the equity interests and assets of Iron Mountain Data Centers Virginia 7, LLC. ACCOUNTS RECEIVABLE SECURITIZATION PROGRAM On June 14, 2024, we amended the Accounts Receivable Securitization Program (as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report) to (i) increase the maximum borrowing capacity from $360,000 to $400,000, with an option to increase the borrowing capacity to $450,000, and (ii) extend the maturity date from July 1, 2025 to July 1, 2027, at which point all obligations become due. All other material terms of the Accounts Receivable Securitization Program remain the same as disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. MAXIMUM AMOUNT $400,000 OUTSTANDING BORROWING $373,800 INTEREST RATE 6.4% As of June 30, 2024 LETTERS OF CREDIT As of June 30, 2024, we had outstanding letters of credit totaling $58,880, of which $8,898 reduce our borrowing capacity under the Revolving Credit Facility. The letters of credit expire at various dates between July 2024 and May 2027. 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, 2024. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2024
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 $15,000 over the next several years, of which certain amounts would be covered by insurance or indemnity arrangement.

Stockholders' Equity Matters

Stockholders' Equity Matters	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Stockholders' Equity Matters	STOCKHOLDERS' EQUITY MATTERS In fiscal year 2023 and the six months ended June 30, 2024, our board of directors declared the following dividends: DECLARATION DATE DIVIDEND RECORD DATE TOTAL PAYMENT DATE 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 August 3, 2023 0.6500 September 15, 2023 189,730 October 5, 2023 November 2, 2023 0.6500 December 15, 2023 189,886 January 4, 2024 February 22, 2024 0.6500 March 15, 2024 190,506 April 4, 2024 May 2, 2024 0.6500 June 17, 2024 190,643 July 5, 2024 On August 1, 2024, we declared a dividend to our stockholders of record as of September 16, 2024 of $0.715 per share, payable on October 3, 2024.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION Our reportable segments as of December 31, 2023 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 The remaining activities of our business consist primarily of our Fine Arts and ALM businesses and other corporate items ("Corporate and Other"). The operations associated with acquisitions completed during the first six months of 2024 have been incorporated into our existing reportable segments. 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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Global RIM Business Total Revenues $ 1,250,577 $ 1,159,867 $ 2,460,734 $ 2,286,393 Adjusted EBITDA 548,742 499,062 1,075,010 976,846 Global Data Center Business Total Revenues $ 152,702 $ 118,033 $ 296,639 $ 230,338 Adjusted EBITDA 66,017 53,809 127,585 104,444 Corporate and Other Total Revenues $ 131,130 $ 80,036 $ 253,899 $ 155,554 Adjusted EBITDA (70,398) (77,213) (139,379) (144,824) Total Consolidated Total Revenues $ 1,534,409 $ 1,357,936 $ 3,011,272 $ 2,672,285 Adjusted EBITDA 544,361 475,658 1,063,216 936,466 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 • Loss (gain) 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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Net Income (Loss) $ 34,621 $ 1,143 $ 111,646 $ 66,678 Add/(Deduct): Interest expense, net 176,521 144,178 341,040 281,347 Provision (benefit) for income taxes 13,319 4,255 29,928 21,013 Depreciation and amortization 224,501 195,367 434,056 377,461 Acquisition and Integration Costs 9,502 1,511 17,311 3,106 Restructuring and other transformation 46,513 45,588 87,280 82,501 Loss (gain) on disposal/write-down of property, plant and equipment, net (including real estate) 2,790 (1,505) 3,179 (14,566) Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures 4,532 58,694 (8,578) 76,185 Stock-based compensation expense 29,889 22,373 43,928 34,882 Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures 2,173 4,054 3,426 7,859 Adjusted EBITDA $ 544,361 $ 475,658 $ 1,063,216 $ 936,466 Information as to our revenues by product and service lines by segment for the three and six months ended June 30, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Global RIM Business Records Management (1) $ 974,480 $ 898,634 $ 1,911,132 $ 1,766,622 Data Management (1) 131,073 130,251 263,123 259,845 Information Destruction (1)(2) 145,024 130,982 286,479 259,926 Data Center (1) — — — — Global Data Center Business Records Management (1) $ — $ — $ — $ — Data Management (1) — — — — Information Destruction (1) — — — — Data Center (1) 152,702 118,033 296,639 230,338 Corporate and Other Records Management (1) $ 40,996 $ 37,409 $ 80,068 $ 71,757 Data Management (1) — — — — Information Destruction (1)(3) 90,134 42,627 173,831 83,797 Data Center (1) — — — — Total Consolidated Records Management (1) $ 1,015,476 $ 936,043 $ 1,991,200 $ 1,838,379 Data Management (1) 131,073 130,251 263,123 259,845 Information Destruction (1)(2)(3) 235,158 173,609 460,310 343,723 Data Center (1) 152,702 118,033 296,639 230,338 (1) Each of these offerings has a component of revenue that is storage rental related and a component that is service related, except for information destruction, which does not have a storage rental component. (2) Information destruction revenue for our Global RIM Business includes secure shredding services. (3) Information destruction revenue for Corporate and Other includes product revenue from our ALM business.

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2024
Related Party Transactions [Abstract]
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 February 2022, we entered into a storage and service agreement with the joint venture formed by Clutter, Inc. and us (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 (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) 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, 2024 and 2023 is as follows (approximately): THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Frankfurt JV Agreements (1) $ 2,100 $ 800 $ 2,500 $ 1,700 Clutter Agreement (2) — 7,000 — 13,000 (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 Clutter Agreement is presented as a component of our Global RIM Business segment.

Restructuring And Other Transfo

Restructuring And Other Transformation	6 Months Ended
	Jun. 30, 2024
Restructuring and Related Activities [Abstract]
Restructuring And Other Transformation	RESTRUCTURING AND OTHER TRANSFORMATION PROJECT MATTERHORN In September 2022, we announced Project Matterhorn. Project Matterhorn investments focus on transforming our operating model to a global operating model. Project Matterhorn focuses 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 are 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. 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, 2024 and 2023, and from the inception of Project Matterhorn through June 30, 2024, is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, FROM THE INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2024 2024 2023 2024 2023 Restructuring $ 16,336 $ 16,127 $ 27,062 $ 28,084 $ 97,673 Other transformation 30,177 29,461 60,218 54,417 206,755 Restructuring and other transformation $ 46,513 $ 45,588 $ 87,280 $ 82,501 $ 304,428 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, 2024 and 2023, and from the inception of Project Matterhorn through June 30, 2024, is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, FROM THE INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2024 2024 2023 2024 2023 Global RIM Business $ 12,643 $ 15,000 $ 22,784 $ 24,525 $ 82,589 Global Data Center Business 2,572 — 2,576 78 3,096 Corporate and Other 1,121 1,127 1,702 3,481 11,988 Total restructuring costs $ 16,336 $ 16,127 $ 27,062 $ 28,084 $ 97,673 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, 2024 and 2023, and from the inception of Project Matterhorn through June 30, 2024, is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, FROM THE INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2024 2024 2023 2024 2023 Global RIM Business $ 10,374 $ 4,958 $ 19,344 $ 8,443 $ 51,614 Global Data Center Business 1,272 498 2,663 1,368 7,685 Corporate and Other 18,531 24,005 38,211 44,606 147,456 Total other transformation costs $ 30,177 $ 29,461 $ 60,218 $ 54,417 $ 206,755 The rollforward of the accrued restructuring costs and accrued other transformation costs, which are included as components of Accrued expenses and other current liabilities in our Condensed Consolidated Balance Sheets, for December 31, 2023 through June 30, 2024, is as follows: RESTRUCTURING OTHER TRANSFORMATION TOTAL RESTRUCTURING AND OTHER TRANSFORMATION Balance as of December 31, 2023 $ 10,731 $ 24,854 $ 35,585 Amount accrued 27,062 60,218 87,280 Payments (30,867) (71,734) (102,601) Balance as of June 30, 2024 $ 6,926 $ 13,338 $ 20,264

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	6 Months Ended
	Jun. 30, 2024 shares	Jun. 30, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Ms. Deborah Marson [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On May 3, 2024, Ms. Deborah Marson, our Executive Vice President, General Counsel and Secretary, adopted a 10b5-1 trading plan to exercise options to purchase up to 4,636 shares of our common stock and sell up to 29,836 shares of our common stock between August 9, 2024 and March 31, 2025. Ms. Marson’s plan will terminate on the earlier of (i) March 31, 2025 and (ii) the date that all trades under the plan are completed.
Name	Ms. Deborah Marson
Title	Executive Vice President, General Counsel and Secretary
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 3, 2024
Expiration Date	March 31, 2025
Arrangement Duration	234 days
Mr. Walter Rakowich [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On June 12, 2024, Mr. Walter Rakowich, a member of our board of directors, adopted a 10b5-1 trading plan to sell up to 40% of the gross shares to be acquired upon vesting of his 2025 and 2026 annual equity awards between May 28, 2025 and June 30, 2026. Mr. Rakowich’s plan will terminate on the earlier of (i) June 30, 2026 and (ii) the date that all trades under the plan are completed.
Name	Mr. Walter Rakowich
Title	board of directors
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 12, 2024
Expiration Date	June 30, 2026
Arrangement Duration	398 days
Purchase Common Stock [Member] | Ms. Deborah Marson [Member]
Trading Arrangements, by Individual
Aggregate Available	4,636	4,636
Sell Common Stock [Member] | Ms. Deborah Marson [Member]
Trading Arrangements, by Individual
Aggregate Available	29,836	29,836

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Cash and Cash Equivalents	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.
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.
Fair Value Measurements	The level 3 valuations of the deferred purchase obligations were determined utilizing Monte-Carlo models and take into account our forecasted projections as they relate to the underlying performance of the respective businesses. The Monte-Carlo simulation model applied in assessing the fair value of the deferred purchase obligation associated with the ITRenew Transaction incorporates assumptions as to expected gross profits over the 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 arrangement and overall market risks. The Monte-Carlo simulation model applied in assessing the fair value of the deferred purchase obligation associated with the Regency Transaction incorporates assumptions as to expected revenue over the achievement period, including adjustments for volatility and timing, as well as discount rates that account for the risk of the arrangement and overall market risks. Any material change to these assumptions may result in a significantly higher or lower fair value of the related deferred purchase obligation.
Revenues	REVENUESThe costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to fulfill or obtain customer contracts (collectively, "Contract Costs"). 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 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.
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.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2024
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, 2024 is as follows: Balance as of December 31, 2023 $ 74,762 Credit memos charged to revenue 44,137 Allowance for bad debts charged to expense 24,233 Deductions and other (1) (64,619) Balance as of June 30, 2024 $ 78,513 (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, 2024 and December 31, 2023 are as follows: DESCRIPTION JUNE 30, 2024 DECEMBER 31, 2023 Assets: Operating lease right-of-use assets $ 2,593,461 $ 2,696,024 Financing lease right-of-use assets, net of accumulated depreciation (1) 340,842 304,600 Liabilities: Current Operating lease liabilities $ 302,234 $ 291,795 Financing lease liabilities (1) 42,260 39,089 Long-term Operating lease liabilities $ 2,453,935 $ 2,562,394 Financing lease liabilities (1) 336,653 310,776 (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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DESCRIPTION 2024 2023 2024 2023 Operating lease cost (1) $ 172,735 $ 161,241 $ 344,481 $ 317,114 Financing lease cost: Depreciation of financing lease right-of-use assets $ 12,078 $ 10,202 $ 23,022 $ 20,210 Interest expense for financing lease liabilities 5,217 4,416 10,438 8,757 (1) Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $39,594 and $77,688 for the three and six months ended June 30, 2024, respectively, and $34,418 and $65,998 for the three and six months ended June 30, 2023, respectively. SIX MONTHS ENDED JUNE 30, CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES: 2024 2023 Operating cash flows used in operating leases $ 235,030 $ 220,764 Operating cash flows used in financing leases (interest) 10,438 8,757 Financing cash flows used in financing leases 21,536 22,010 NON-CASH ITEMS: Operating lease modifications and reassessments $ 573 $ 44,779 New operating leases (including acquisitions and sale-leaseback transactions) 80,474 163,326
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 and Corporate and Other (as defined in Note 9) for the six months ended June 30, 2024 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, 2023 $ 3,911,945 $ 478,930 $ 627,037 $ 5,017,912 Tax deductible goodwill acquired during the period — — 131,790 131,790 Fair value and other adjustments 963 (186) (186) 591 Currency effects (45,888) (3,928) (705) (50,521) Goodwill balance, net of accumulated amortization, as of June 30, 2024 $ 3,867,020 $ 474,816 $ 757,936 $ 5,099,772 Accumulated goodwill impairment balance as of June 30, 2024 $ 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, 2024 and December 31, 2023 are as follows: FAIR VALUE MEASUREMENTS AT JUNE 30, 2024 USING DESCRIPTION TOTAL CARRYING VALUE AT JUNE 30, 2024 QUOTED PRICES IN SIGNIFICANT OTHER SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) (2) Money Market Funds $ 10,218 $ — $ 10,218 $ — Time Deposits 20,762 — 20,762 — Trading Securities 8,841 7,166 1,675 — Derivative Assets 25,607 — 25,607 — Derivative Liabilities 2,670 — 2,670 — Deferred Purchase Obligations (1) 114,703 — — 114,703 FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2023 USING DESCRIPTION TOTAL CARRYING VALUE AT DECEMBER 31, 2023 QUOTED PRICES IN SIGNIFICANT OTHER SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) (2) Money Market Funds $ 66,008 $ — $ 66,008 $ — Time Deposits 15,913 — 15,913 — Trading Securities 9,952 6,149 3,803 — Derivative Assets 6,359 — 6,359 — Derivative Liabilities 5,769 — 5,769 — Deferred Purchase Obligations (1) 208,265 — — 208,265 (1) Primarily relates to the fair values of the deferred purchase obligations associated with the ITRenew Transaction (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) and the Regency Transaction (as defined in Note 3). (2) The following is a rollforward of the Level 3 liabilities presented above for December 31, 2023 through June 30, 2024: Balance as of December 31, 2023 $ 208,265 Additions 63,700 Payments (158,677) Other changes, including accretion 1,415 Balance as of June 30, 2024 $ 114,703
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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, 2024 THREE MONTHS ENDED JUNE 30, 2023 FOREIGN DERIVATIVE FINANCIAL TOTAL FOREIGN DERIVATIVE FINANCIAL TOTAL Beginning of Period $ (440,129) $ 11,332 $ (428,797) $ (414,832) $ 9,064 $ (405,768) Other comprehensive (loss) income: Foreign currency translation and other adjustments (31,806) — (31,806) 18,155 — 18,155 Change in fair value of derivative instruments — (488) (488) — 7,896 7,896 Reclassifications from accumulated other comprehensive items, net — — — — (2,527) (2,527) Total other comprehensive (loss) income (31,806) (488) (32,294) 18,155 5,369 23,524 End of Period $ (471,935) $ 10,844 $ (461,091) $ (396,677) $ 14,433 $ (382,244) SIX MONTHS ENDED JUNE 30, 2024 SIX MONTHS ENDED JUNE 30, 2023 FOREIGN DERIVATIVE FINANCIAL TOTAL FOREIGN DERIVATIVE FINANCIAL TOTAL Beginning of Period $ (373,628) $ 2,472 $ (371,156) $ (454,509) $ 12,506 $ (442,003) Other comprehensive (loss) income: Foreign currency translation and other adjustments (98,307) — (98,307) 57,832 — 57,832 Change in fair value of derivative instruments — 10,900 10,900 — 4,454 4,454 Reclassifications from accumulated other comprehensive items, net — (2,528) (2,528) — (2,527) (2,527) Total other comprehensive (loss) income (98,307) 8,372 (89,935) 57,832 1,927 59,759 End of Period $ (471,935) $ 10,844 $ (461,091) $ (396,677) $ 14,433 $ (382,244)
Schedule of Cost and Accumulated Amortization Associated with Contract Fulfillment Costs	Contract Costs as of June 30, 2024 and December 31, 2023 are as follows: JUNE 30, 2024 DECEMBER 31, 2023 GROSS ACCUMULATED NET GROSS ACCUMULATED NET Intake Costs asset $ 77,922 $ (38,683) $ 39,239 $ 76,150 $ (39,617) $ 36,533 Commissions asset 178,289 (67,801) 110,488 156,639 (64,279) 92,360
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, 2024 DECEMBER 31, 2023 Deferred revenue - Current Deferred revenue $ 329,718 $ 325,665 Deferred revenue - Long-term Other Long-term Liabilities 95,605 100,770
Schedule of Revenue	Storage rental revenue associated with our Global Data Center Business for the three and six months ended June 30, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Storage rental revenue $ 147,397 $ 110,990 $ 287,425 $ 218,425
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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Stock-based compensation expense $ 29,889 $ 22,373 $ 43,928 $ 34,882
Schedule of Acquisition and Integration Costs	Acquisition and Integration Costs for the three and six months ended June 30, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Acquisition and Integration Costs $ 9,502 $ 1,511 $ 17,311 $ 3,106
Schedule of Gain (Loss) on Disposal/Write-Down of Property, Plant and Equipment, Net	Loss (gain) on disposal/write-down of property, plant and equipment, net for the three and six months ended June 30, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 (1) Loss (gain) on disposal/write-down of property, plant and equipment, net $ 2,790 $ (1,505) $ 3,179 $ (14,566) (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 2023. The gains recognized during 2023 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, 2024 and 2023 consists of the following: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DESCRIPTION 2024 2023 2024 2023 Foreign currency transaction losses (gains), net (1) $ 1,013 $ 15,063 $ (15,366) $ 29,487 Other, net (2) 4,820 47,887 8,669 54,663 Other Expense (Income), Net $ 5,833 $ 62,950 $ (6,697) $ 84,150 (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 $38,000 associated with the remeasurement to fair value of our previously held equity interest in the Clutter JV (as defined and discussed in Note 10) as well as 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).
Schedule of Income Taxes	Our effective tax rates for the three and six months ended June 30, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 (1) 2023 (2) 2024 2023 (2) Effective Tax Rate 27.8 % 78.8 % 21.1 % 24.0 % (1) The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended June 30, 2024 were the lack of tax benefits recognized for the year to date ordinary losses of certain entities, the benefits derived from the dividends paid deduction and 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, 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.
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, 2024 and 2023 are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Net Income (Loss) $ 34,621 $ 1,143 $ 111,646 $ 66,678 Less: Net (Loss) Income Attributable to Noncontrolling Interests (1,162) 1,029 1,802 1,969 Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 35,783 $ 114 $ 109,844 $ 64,709 Weighted-average shares—basic 293,340,000 291,825,000 293,043,000 291,633,000 Effect of dilutive potential stock options 2,068,000 1,322,000 1,977,000 1,269,000 Effect of dilutive potential RSUs and PUs 430,000 380,000 509,000 386,000 Weighted-average shares—diluted 295,838,000 293,527,000 295,529,000 293,288,000 Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated: Basic $ 0.12 $ 0.00 $ 0.37 $ 0.22 Diluted $ 0.12 $ 0.00 $ 0.37 $ 0.22 Antidilutive stock options, RSUs and PUs excluded from the calculation 506,149 157,132 435,957 151,431

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [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 our acquisition closed during the six months ended June 30, 2024 is as follows: SIX MONTHS ENDED JUNE 30, 2024 Cash Paid (gross of cash acquired) $ 125,844 Deferred Purchase Obligations, Purchase Price Holdbacks and Other (1) 133,813 Total Consideration 259,657 Fair Value of Identifiable Assets Acquired (2) 156,108 Fair Value of Identifiable Liabilities Acquired (28,241) Goodwill Initially Recorded (3) $ 131,790 (1) Consists of the acquisition-date fair values of the Regency Deferred Purchase Obligation and the January 2025 Payment. (2) Assets acquired include a supplier relationship intangible asset, which has a fair value of $107,500 and a weighted average life of approximately 20 years. (3) 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.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2024
Investments, All Other Investments [Abstract]
Schedule of Equity Method Investments	The carrying value and equity interest in the Frankfurt JV at June 30, 2024 and December 31, 2023 is as follows: JUNE 30, 2024 DECEMBER 31, 2023 CARRYING VALUE EQUITY INTEREST CARRYING VALUE EQUITY INTEREST Frankfurt JV $ 64,561 20 % $ 57,874 20 %

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The fair values of derivative instruments recognized in our Condensed Consolidated Balance Sheets at June 30, 2024 and December 31, 2023, by derivative instrument, are as follows: JUNE 30, 2024 DECEMBER 31, 2023 DERIVATIVE INSTRUMENTS (1) Assets Liabilities Assets Liabilities Cash Flow Hedges (2) Interest rate swap agreements $ 11,898 $ (2,670) $ 1,601 $ (3,273) Net Investment Hedges (3) Cross-currency swap agreements 13,709 — 4,758 (2,496) (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, 2024, $2,074 is included within Prepaid expenses and other, $23,533 is included within Other assets and $2,670 is included within Other long-term liabilities. As of December 31, 2023, $6,359 is included within Other assets, $2,496 is included within Accrued expenses and other current liabilities and $3,273 is included within Other long-term liabilities. (2) As of June 30, 2024, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our interest rate swap agreements are $10,844. (3) As of June 30, 2024, cumulative net gains recorded within Accumulated other comprehensive items, net associated with our cross-currency swap agreements are $52,259, which include $38,550 related to the excluded component of our cross-currency swap agreements.
Schedule of Gains (Losses) for Derivative Instruments	Unrealized (losses) gains recognized in Accumulated other comprehensive items, net during the three and six months ended June 30, 2024 and 2023, by derivative instrument, are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DERIVATIVE INSTRUMENTS 2024 2023 2024 2023 Cash Flow Hedges Interest rate swap agreements $ (488) $ 7,896 $ 10,900 $ 4,454 Net Investment Hedges Cross-currency swap agreements 3,135 (12,704) 11,447 (21,507) Cross-currency swap agreements (excluded component) 4,177 5,817 8,353 11,651 (Losses) gains recognized in Net income (loss) during the three and six months ended June 30, 2024 and 2023, by derivative instrument, are as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, DERIVATIVE INSTRUMENTS Location of gain (loss) 2024 2023 2024 2023 Cash Flow Hedges Interest rate swap agreements Interest expense $ — $ 2,527 $ 2,528 $ 2,527 Net Investment Hedges Cross-currency swap agreements (excluded component) Interest expense (4,177) (5,817) (8,353) (11,651)

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2024
Debt Disclosure [Abstract]
Schedule of Carrying Amount and Fair Value of Long-Term Debt Instruments	Long-term debt is as follows: JUNE 30, 2024 DECEMBER 31, 2023 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) $ 745,000 $ (4,065) $ 740,935 $ 745,000 $ — $ (4,621) $ (4,621) $ — Term Loan A (1) 221,875 — 221,875 221,875 228,125 — 228,125 228,125 Term Loan B due 2026 (1) 655,911 (1,874) 654,037 656,250 659,298 (2,498) 656,800 659,750 Term Loan B due 2031 (1) 1,185,635 (12,369) 1,173,266 1,194,000 1,191,000 (13,026) 1,177,974 1,200,000 Virginia 3 Term Loans (2) 221,615 (3,771) 217,844 221,615 101,218 (4,641) 96,577 101,218 Virginia 4/5 Term Loans (2) 61,513 (4,286) 57,227 61,513 16,338 (5,892) 10,446 16,338 Virginia 6 Term Loans (3) 53,825 (5,585) 48,240 53,825 — — — — Australian Dollar Term Loan (2) 191,334 (365) 190,969 192,498 197,743 (482) 197,261 199,195 UK Bilateral Revolving Credit Facility (2) 177,043 — 177,043 177,043 178,239 — 178,239 178,239 GBP Notes (2) 505,836 (1,274) 504,562 492,780 509,254 (1,763) 507,491 489,108 4 7 / 8 % Notes due 2027 (2) 1,000,000 (4,621) 995,379 962,500 1,000,000 (5,332) 994,668 967,500 5 1 / 4 % Notes due 2028 (2 825,000 (4,428) 820,572 796,125 825,000 (5,019) 819,981 800,250 5% Notes due 2028 (2) 500,000 (2,954) 497,046 477,500 500,000 (3,316) 496,684 478,750 7% Notes due 2029 (2) 1,000,000 (9,750) 990,250 1,012,500 1,000,000 (10,813) 989,187 1,027,500 4 7 / 8 % Notes due 2029 (2) 1,000,000 (7,595) 992,405 937,500 1,000,000 (8,318) 991,682 945,000 5 1 / 4 % Notes due 2030 (2) 1,300,000 (9,151) 1,290,849 1,228,500 1,300,000 (9,903) 1,290,097 1,241,500 4 1 / 2 % Notes (2) 1,100,000 (8,296) 1,091,704 990,000 1,100,000 (8,917) 1,091,083 995,500 5% Notes due 2032 (2) 750,000 (10,553) 739,447 682,500 750,000 (11,206) 738,794 684,375 5 5 / 8 % Notes (2) 600,000 (4,695) 595,305 565,500 600,000 (4,985) 595,015 567,000 Real Estate Mortgages, Financing Lease Liabilities and Other 568,267 (638) 567,629 568,267 519,907 (403) 519,504 519,907 Accounts Receivable Securitization Program (3) 373,800 (809) 372,991 373,800 358,500 (317) 358,183 358,183 Total Long-term Debt 13,036,654 (97,079) 12,939,575 12,034,622 (101,452) 11,933,170 Less Current Portion (125,409) — (125,409) (120,670) — (120,670) Long-term Debt, Net of Current Portion $ 12,911,245 $ (97,079) $ 12,814,166 $ 11,913,952 $ (101,452) $ 11,812,500 (1) Collectively, the “Credit Agreement”. The Credit Agreement consists of a revolving credit facility (the “Revolving Credit Facility”), a term loan A facility (the “Term Loan A”) and two term loan B facilities (the "Term Loan B due 2026" and the "Term Loan B due 2031"). The remaining amount available for borrowing under the Revolving Credit Facility as of June 30, 2024 was $1,496,102 (which represents the maximum availability as of such date). The weighted average interest rate in effect under the Revolving Credit Facility was 7.2% as of June 30, 2024. Due to the discontinuance of the Canadian Dollar Offered Rate reference rate on June 28, 2024, the Credit Agreement was amended on June 7, 2024 to update the interest rate benchmark available for Canadian currency borrowings under our Revolving Credit Facility to the Canadian Overnight Repo Rate Average, effective July 1, 2024. All other material terms of the Revolving Credit Facility remain the same as disclosed in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. (2) Each as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report. (3) The fair value (Level 2 of fair value hierarchy described at Note 2.e.) of this debt instrument approximates the carrying value as borrowings under this debt instrument are based on a current variable market interest rate. AGREEMENT MAXIMUM BORROWING OUTSTANDING BORROWINGS AS OF JUNE 30, 2024 DIRECT CONTRACTUAL INTEREST RATE UNUSED COMMITMENT FEE MATURITY DATE (1) Virginia 6 Term Loans (2) $ 210,000 $ 53,825 Iron Mountain Data Centers Virginia 6, LLC SOFR plus 2.75% 0.75% May 3, 2027 Virginia 7 Term Loans (3) 300,000 — Iron Mountain Data Centers Virginia 7, LLC SOFR plus 2.50% 0.75% April 12, 2027 (1) All obligations will become due on the specified maturity dates. Each agreement includes two one-year options that allow us to extend the initial maturity date, subject to the conditions specified in the agreements. (2) On May 3, 2024, Iron Mountain Data Centers Virginia 6, LLC, a wholly-owned subsidiary of Iron Mountain Data Centers Virginia 6/7 JV, LLC, entered into a credit agreement (the "Virginia 6 Credit Agreement"). The Virginia 6 Credit Agreement consists of a term loan facility (the "Virginia 6 Term Loans") and a letter of credit facility. The Virginia 6 Credit Agreement is secured by the equity interests and assets of Iron Mountain Data Centers Virginia 6, LLC. As of June 30, 2024, the interest rate in effect under the Virginia 6 Credit Agreement was 5.3%. (3) On April 12, 2024, Iron Mountain Data Centers Virginia 7, LLC, a wholly-owned subsidiary of Iron Mountain Data Centers Virginia 6/7 JV, LLC, entered into a credit agreement (the "Virginia 7 Credit Agreement"). The Virginia 7 Credit Agreement consists of a term loan facility and a letter of credit facility. The Virginia 7 Credit Agreement is secured by the equity interests and assets of Iron Mountain Data Centers Virginia 7, LLC.

Stockholders' Equity Matters (T

Stockholders' Equity Matters (Tables)	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Schedule of Dividend Declared and Payments	In fiscal year 2023 and the six months ended June 30, 2024, our board of directors declared the following dividends: DECLARATION DATE DIVIDEND RECORD DATE TOTAL PAYMENT DATE 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 August 3, 2023 0.6500 September 15, 2023 189,730 October 5, 2023 November 2, 2023 0.6500 December 15, 2023 189,886 January 4, 2024 February 22, 2024 0.6500 March 15, 2024 190,506 April 4, 2024 May 2, 2024 0.6500 June 17, 2024 190,643 July 5, 2024

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2024
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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Global RIM Business Total Revenues $ 1,250,577 $ 1,159,867 $ 2,460,734 $ 2,286,393 Adjusted EBITDA 548,742 499,062 1,075,010 976,846 Global Data Center Business Total Revenues $ 152,702 $ 118,033 $ 296,639 $ 230,338 Adjusted EBITDA 66,017 53,809 127,585 104,444 Corporate and Other Total Revenues $ 131,130 $ 80,036 $ 253,899 $ 155,554 Adjusted EBITDA (70,398) (77,213) (139,379) (144,824) Total Consolidated Total Revenues $ 1,534,409 $ 1,357,936 $ 3,011,272 $ 2,672,285 Adjusted EBITDA 544,361 475,658 1,063,216 936,466
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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Net Income (Loss) $ 34,621 $ 1,143 $ 111,646 $ 66,678 Add/(Deduct): Interest expense, net 176,521 144,178 341,040 281,347 Provision (benefit) for income taxes 13,319 4,255 29,928 21,013 Depreciation and amortization 224,501 195,367 434,056 377,461 Acquisition and Integration Costs 9,502 1,511 17,311 3,106 Restructuring and other transformation 46,513 45,588 87,280 82,501 Loss (gain) on disposal/write-down of property, plant and equipment, net (including real estate) 2,790 (1,505) 3,179 (14,566) Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures 4,532 58,694 (8,578) 76,185 Stock-based compensation expense 29,889 22,373 43,928 34,882 Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures 2,173 4,054 3,426 7,859 Adjusted EBITDA $ 544,361 $ 475,658 $ 1,063,216 $ 936,466
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, 2024 and 2023 is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Global RIM Business Records Management (1) $ 974,480 $ 898,634 $ 1,911,132 $ 1,766,622 Data Management (1) 131,073 130,251 263,123 259,845 Information Destruction (1)(2) 145,024 130,982 286,479 259,926 Data Center (1) — — — — Global Data Center Business Records Management (1) $ — $ — $ — $ — Data Management (1) — — — — Information Destruction (1) — — — — Data Center (1) 152,702 118,033 296,639 230,338 Corporate and Other Records Management (1) $ 40,996 $ 37,409 $ 80,068 $ 71,757 Data Management (1) — — — — Information Destruction (1)(3) 90,134 42,627 173,831 83,797 Data Center (1) — — — — Total Consolidated Records Management (1) $ 1,015,476 $ 936,043 $ 1,991,200 $ 1,838,379 Data Management (1) 131,073 130,251 263,123 259,845 Information Destruction (1)(2)(3) 235,158 173,609 460,310 343,723 Data Center (1) 152,702 118,033 296,639 230,338 (1) Each of these offerings has a component of revenue that is storage rental related and a component that is service related, except for information destruction, which does not have a storage rental component. (2) Information destruction revenue for our Global RIM Business includes secure shredding services. (3) Information destruction revenue for Corporate and Other includes product revenue from our ALM business.

Related Parties (Tables)

Related Parties (Tables)	6 Months Ended
	Jun. 30, 2024
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, 2024 and 2023 is as follows (approximately): THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, 2024 2023 2024 2023 Frankfurt JV Agreements (1) $ 2,100 $ 800 $ 2,500 $ 1,700 Clutter Agreement (2) — 7,000 — 13,000 (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 Clutter Agreement is presented as a component of our Global RIM Business segment.

Restructuring And Other Trans_2

Restructuring And Other Transformation (Tables)	6 Months Ended
	Jun. 30, 2024
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, 2024 and 2023, and from the inception of Project Matterhorn through June 30, 2024, is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, FROM THE INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2024 2024 2023 2024 2023 Restructuring $ 16,336 $ 16,127 $ 27,062 $ 28,084 $ 97,673 Other transformation 30,177 29,461 60,218 54,417 206,755 Restructuring and other transformation $ 46,513 $ 45,588 $ 87,280 $ 82,501 $ 304,428 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, 2024 and 2023, and from the inception of Project Matterhorn through June 30, 2024, is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, FROM THE INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2024 2024 2023 2024 2023 Global RIM Business $ 12,643 $ 15,000 $ 22,784 $ 24,525 $ 82,589 Global Data Center Business 2,572 — 2,576 78 3,096 Corporate and Other 1,121 1,127 1,702 3,481 11,988 Total restructuring costs $ 16,336 $ 16,127 $ 27,062 $ 28,084 $ 97,673 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, 2024 and 2023, and from the inception of Project Matterhorn through June 30, 2024, is as follows: THREE MONTHS ENDED JUNE 30, SIX MONTHS ENDED JUNE 30, FROM THE INCEPTION OF PROJECT MATTERHORN THROUGH JUNE 30, 2024 2024 2023 2024 2023 Global RIM Business $ 10,374 $ 4,958 $ 19,344 $ 8,443 $ 51,614 Global Data Center Business 1,272 498 2,663 1,368 7,685 Corporate and Other 18,531 24,005 38,211 44,606 147,456 Total other transformation costs $ 30,177 $ 29,461 $ 60,218 $ 54,417 $ 206,755 The rollforward of the accrued restructuring costs and accrued other transformation costs, which are included as components of Accrued expenses and other current liabilities in our Condensed Consolidated Balance Sheets, for December 31, 2023 through June 30, 2024, is as follows: RESTRUCTURING OTHER TRANSFORMATION TOTAL RESTRUCTURING AND OTHER TRANSFORMATION Balance as of December 31, 2023 $ 10,731 $ 24,854 $ 35,585 Amount accrued 27,062 60,218 87,280 Payments (30,867) (71,734) (102,601) Balance as of June 30, 2024 $ 6,926 $ 13,338 $ 20,264

Summary of Significant Accoun_4

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, 2024 USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 74,762
Credit memos charged to revenue	44,137
Allowance for bad debts charged to expense	24,233
Deductions and other	(64,619)
Ending balance	$ 78,513

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Operating lease right-of-use assets	$ 2,593,461	$ 2,696,024
Financing lease right-of-use assets, net of accumulated depreciation	340,842	304,600
Current
Operating lease liabilities	302,234	291,795
Finance lease liabilities	42,260	39,089
Long-term
Operating lease liabilities	2,453,935	2,562,394
Finance lease liabilities	$ 336,653	$ 310,776
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

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Leases Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounting Policies [Abstract]
Operating lease cost	$ 172,735	$ 161,241	$ 344,481	$ 317,114
Depreciation of financing lease right-of-use assets	12,078	10,202	23,022	20,210
Interest expense for financing lease liabilities	5,217	4,416	10,438	8,757
Variable lease costs	$ 39,594	$ 34,418	$ 77,688	$ 65,998

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Accounting Policies [Abstract]
Operating cash flows used in operating leases	$ 235,030	$ 220,764
Operating cash flows used in financing leases (interest)	10,438	8,757
Financing cash flows used in financing leases	21,536	22,010
Operating lease modifications and reassessments	573	44,779
New operating leases (including acquisitions and sale-leaseback transactions)	$ 80,474	$ 163,326

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Schedule of Changes in Carrying Value of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	$ 5,017,912
Tax deductible goodwill acquired during the period	131,790
Fair value and other adjustments	591
Currency effects	(50,521)
Goodwill ending balance	5,099,772
Accumulated goodwill impairment	158,420
GLOBAL RIM BUSINESS
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	3,911,945
Tax deductible goodwill acquired during the period	0
Fair value and other adjustments	963
Currency effects	(45,888)
Goodwill ending balance	3,867,020
Accumulated goodwill impairment	132,409
GLOBAL DATA CENTER BUSINESS
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	478,930
Tax deductible goodwill acquired during the period	0
Fair value and other adjustments	(186)
Currency effects	(3,928)
Goodwill ending balance	474,816
Accumulated goodwill impairment	0
CORPORATE AND OTHER
Gross amount of goodwill [Roll Forward]
Goodwill beginning balance	627,037
Tax deductible goodwill acquired during the period	131,790
Fair value and other adjustments	(186)
Currency effects	(705)
Goodwill ending balance	757,936
Accumulated goodwill impairment	$ 26,011

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Deferred Purchase Obligations
Deferred Purchase Obligations [Roll Forward]
Balance as of December 31, 2023	$ 208,265
Additions	63,700
Payments	(158,677)
Other changes, including accretion	1,415
Balance as of June 30, 2024	114,703
Fair Value, Measurements, Recurring | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	7,166	$ 6,149
Derivative Assets	0	0
Derivative Liabilities	0	0
Deferred purchase obligations	0	0
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	1,675	3,803
Derivative Assets	25,607	6,359
Derivative Liabilities	2,670	5,769
Deferred purchase obligations	0	0
Fair Value, Measurements, Recurring | 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	10,218	66,008
Fair Value, Measurements, Recurring | 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	20,762	15,913
Fair Value, Measurements, Recurring | 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	114,703	208,265
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | Estimate of Fair Value
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Trading Securities	8,841	9,952
Derivative Assets	25,607	6,359
Derivative Liabilities	2,670	5,769
Deferred purchase obligations	114,703	208,265
Fair Value, Measurements, Recurring | 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	10,218	66,008
Fair Value, Measurements, Recurring | Estimate of Fair Value | Time Deposits
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]
Cash and cash equivalents	$ 20,762	$ 15,913

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Rollforward
Beginning of Period	$ 18,660	$ 545,589	$ 211,773	$ 636,793
Other comprehensive (loss) income:
Foreign currency translation and other adjustments	(31,806)	18,155	(98,307)	57,832
Change in fair value of derivative instruments	(488)	7,896	10,900	4,454
Reclassifications from accumulated other comprehensive items, net	0	(2,527)	(2,528)	(2,527)
Total other comprehensive (loss) income	(32,294)	23,524	(89,935)	59,759
End of Period	(132,749)	416,343	(132,749)	416,343
TOTAL
AOCI Rollforward
Beginning of Period	(428,797)	(405,768)	(371,156)	(442,003)
Other comprehensive (loss) income:
End of Period	(461,091)	(382,244)	(461,091)	(382,244)
FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS
AOCI Rollforward
Beginning of Period	(440,129)	(414,832)	(373,628)	(454,509)
Other comprehensive (loss) income:
Foreign currency translation and other adjustments	(31,806)	18,155	(98,307)	57,832
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 (loss) income	(31,806)	18,155	(98,307)	57,832
End of Period	(471,935)	(396,677)	(471,935)	(396,677)
DERIVATIVE FINANCIAL INSTRUMENTS
AOCI Rollforward
Beginning of Period	11,332	9,064	2,472	12,506
Other comprehensive (loss) income:
Foreign currency translation and other adjustments	0	0	0	0
Change in fair value of derivative instruments	(488)	7,896	10,900	4,454
Reclassifications from accumulated other comprehensive items, net	0	(2,527)	(2,528)	(2,527)
Total other comprehensive (loss) income	(488)	5,369	8,372	1,927
End of Period	$ 10,844	$ 14,433	$ 10,844	$ 14,433

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Intake Costs asset
Contract With Customer, Asset And Liabilities [Line Items]
GROSS CARRYING AMOUNT	$ 77,922	$ 76,150
ACCUMULATED AMORTIZATION	(38,683)	(39,617)
NET CARRYING AMOUNT	39,239	36,533
Commissions asset
Contract With Customer, Asset And Liabilities [Line Items]
GROSS CARRYING AMOUNT	178,289	156,639
ACCUMULATED AMORTIZATION	(67,801)	(64,279)
NET CARRYING AMOUNT	$ 110,488	$ 92,360

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Summary of Deferred Revenue Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Deferred revenue - Current	$ 329,718	$ 325,665
Deferred revenue - Long-term	$ 95,605	$ 100,770

Summary of Significant Accou_13

Summary of Significant Accounting Policies - Storage Rental (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Lessor, Lease, Description [Line Items]
Storage rental revenue	$ 1,534,409	$ 1,357,936	$ 3,011,272	$ 2,672,285
GLOBAL DATA CENTER BUSINESS
Lessor, Lease, Description [Line Items]
Storage rental revenue	152,702	118,033	296,639	230,338
Storage rental
Lessor, Lease, Description [Line Items]
Storage rental revenue	919,746	830,756	1,804,588	1,640,845
Storage rental | GLOBAL DATA CENTER BUSINESS
Lessor, Lease, Description [Line Items]
Storage rental revenue	$ 147,397	$ 110,990	$ 287,425	$ 218,425

Summary of Significant Accou_14

Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Employee Stock-Based Awards
Stock-based compensation expense	$ 29,889	$ 22,373	$ 43,928	$ 34,882
Stock options granted (in shares)			83,100
Unrecognized compensation cost	$ 111,128		$ 111,128
Restricted Stock Units
Employee Stock-Based Awards
Granted (in shares)			644,200
Performance units
Employee Stock-Based Awards
Granted (in shares)			450,700

Summary of Significant Accou_15

Summary of Significant Accounting Policies - Acquisition and Integration costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounting Policies [Abstract]
Acquisition and Integration Costs	$ 9,502	$ 1,511	$ 17,311	$ 3,106

Summary of Significant Accou_16

Summary of Significant Accounting Policies - Loss (Gain) on Disposal/Write-Down of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss (gain) on disposal/write-down of property, plant and equipment, net	$ 2,790	$ (1,505)	$ 3,179	$ (14,566)
Facilities in Singapore
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sale and sale-leaseback transactions				$ 18,500

Summary of Significant Accou_17

Summary of Significant Accounting Policies - Other Expense (Income), Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency transaction losses (gains), net	$ 1,013	$ 15,063	$ (15,366)	$ 29,487
Other, net	4,820	47,887	8,669	54,663
Other Expense (Income), Net	$ 5,833	$ 62,950	(6,697)	$ 84,150
Clutter JV
Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss associated with the Clutter Acquisition			$ 38,000

Summary of Significant Accou_18

Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effective tax rate	27.80%	78.80%	21.10%	24%
Federal statutory tax rate	21%	21%	21%	21%
Clutter JV
Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss associated with the Clutter Acquisition			$ 38,000

Summary of Significant Accou_19

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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income (Loss) Per Share-Basic and Diluted
Net Income (Loss)	$ 34,621	$ 1,143	$ 111,646	$ 66,678
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(1,162)	1,029	1,802	1,969
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)	$ 35,783	$ 114	$ 109,844	$ 64,709
Weighted-average shares—basic (in shares)	293,340,000	291,825,000	293,043,000	291,633,000
Effect of dilutive potential stock options (in shares)	2,068,000	1,322,000	1,977,000	1,269,000
Effect of dilutive potential RSUs and PUs (in shares)	430,000	380,000	509,000	386,000
Weighted-average shares—diluted (in shares)	295,838,000	293,527,000	295,529,000	293,288,000
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic (in dollars per share)	$ 0.12	$ 0	$ 0.37	$ 0.22
Diluted (in dollars per share)	$ 0.12	$ 0	$ 0.37	$ 0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares)	506,149	157,132	435,957	151,431

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) ₨ in Thousands				1 Months Ended			3 Months Ended
	Jul. 05, 2024 USD ($)	Jul. 05, 2024 INR (₨)	Jan. 03, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 INR (₨)	Jan. 31, 2025 USD ($)	Sep. 30, 2024 INR (₨)	Jul. 01, 2024
Web Werks JV | Subsequent Event
Business Acquisition [Line Items]
Equity interest	71.94%	71.94%
Forecast | Web Werks JV
Business Acquisition [Line Items]
Equity interest				28.06%	28.06%
RSR Partners, LLC
Business Acquisition [Line Items]
Ownership acquired			100%
Total consideration			$ 200,000,000
Cash Paid (gross of cash acquired)			125,000,000
RSR Partners, LLC | Regency Deferred Purchase Obligation
Business Acquisition [Line Items]
Value of possible subsequent acquisition, low			0
Value of possible subsequent acquisition, high			200,000,000
Contingent consideration liability			$ 78,400,000
RSR Partners, LLC | Forecast
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)						$ 75,000,000
Web Werks JV | Subsequent Event
Business Acquisition [Line Items]
Ownership acquired	8.55%	8.55%						36.61%
Total consideration	$ 35,000,000	₨ 3,000,000
Web Werks JV | Forecast
Business Acquisition [Line Items]
Total consideration				$ 12,000,000	₨ 1,000,000
Change in contingent liability | ₨							₨ 17,000
Cash Paid (gross of cash acquired)				$ 115,000,000	₨ 9,600,000

Acquisitions - Schedule of Purc

Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Goodwill initially recorded	$ 5,099,772	$ 5,017,912
Year To Date Acquisitions
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)	125,844
Deferred Purchase Obligations, Purchase Price Holdbacks and Other	133,813
Total Consideration	259,657
Fair Value of Identifiable Assets Acquired	156,108
Fair Value of Identifiable Liabilities Acquired	(28,241)
Goodwill initially recorded	131,790
Customer Relationships | Year To Date Acquisitions
Business Acquisition [Line Items]
Customer and supplier relationship intangible assets	$ 107,500
Acquired finite-lived intangible assets, weighted average useful life	20 years

Investments - Schedule of Equit

Investments - Schedule of Equity Method Investments (Details) - Frankfurt JV - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
CARRYING VALUE	$ 64,561	$ 57,874
EQUITY INTEREST	20%	20%

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Interest rate swap agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 1,251,000	$ 520,000
Cross-currency Swap Agreements | Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 509,200	$ 509,200

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest rate swap agreements
Derivative [Line Items]
Interest rate swap agreements	$ 0	$ 2,527	$ 2,528	$ 2,527
Cross-currency swap agreements | Net Investment Hedges
Derivative [Line Items]
Cross-currency swap agreements (excluded component)	(4,177)	(5,817)	(8,353)	(11,651)
Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Interest rate swap agreements	(488)	7,896	10,900	4,454
Designated as Hedging Instrument | Cross-currency swap agreements
Derivative [Line Items]
Cross-currency swap agreements	3,135	(12,704)	11,447	(21,507)
Not Designated as Hedging Instrument | Cross-currency swap agreements
Derivative [Line Items]
Cross-currency swap agreements	$ 4,177	$ 5,817	$ 8,353	$ 11,651

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Net Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset, current	$ 2,074
Derivative asset, noncurrent	23,533	$ 6,359
Derivative liability, current		2,496
Derivative liability, noncurrent	$ 2,670	3,273
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
Interest rate swap agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gain in AOCI	$ 10,844
Cash Flow Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	11,898	1,601
Derivative Liabilities	(2,670)	(3,273)
Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	13,709	4,758
Derivative Liabilities	0	$ (2,496)
Cumulative net gain in cross-currency swaps	52,259
Net Investment Hedges | Cross-currency swap agreements (excluded component)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gain in cross-currency swaps	$ 38,550

Debt - Carrying Amount and Fair

Debt - Carrying Amount and Fair Value of Long-Term Debt Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 13,036,654	$ 12,034,622
UNAMORTIZED DEFERRED FINANCING COSTS	(97,079)	(101,452)
CARRYING AMOUNT	12,939,575	11,933,170
Debt, current portion	(125,409)	(120,670)
Unamortized debt issuance expense, net of current portion	0	0
Carrying amount, current maturities	(125,409)	(120,670)
Long term debt, gross, net of current portion	12,911,245	11,913,952
Unamortized deferred financing costs, noncurrent	(97,079)	(101,452)
Carrying amount, excluding current maturities	12,814,166	11,812,500
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	373,800	358,500
UNAMORTIZED DEFERRED FINANCING COSTS	(809)	(317)
CARRYING AMOUNT	372,991	358,183
FAIR VALUE	373,800	358,183
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	58,880
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	745,000
UNAMORTIZED DEFERRED FINANCING COSTS	(4,065)
CARRYING AMOUNT	740,935
FAIR VALUE	745,000
Remaining capacity	$ 1,496,102
Weighted average interest rate (as a percent)	7.20%
Letters of credit outstanding	$ 8,898
Credit Agreement | UK Bilateral Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	177,043	178,239
UNAMORTIZED DEFERRED FINANCING COSTS	0	0
CARRYING AMOUNT	177,043	178,239
FAIR VALUE	177,043	178,239
Credit Agreement | Revolving Credit Facility, Netting
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)		0
UNAMORTIZED DEFERRED FINANCING COSTS		(4,621)
CARRYING AMOUNT		(4,621)
FAIR VALUE		0
Term Loan Facility | Term Loan A
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	221,875	228,125
UNAMORTIZED DEFERRED FINANCING COSTS	0	0
CARRYING AMOUNT	221,875	228,125
FAIR VALUE	221,875	228,125
Term Loan Facility | Term Loan B due 2026
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	655,911	659,298
UNAMORTIZED DEFERRED FINANCING COSTS	(1,874)	(2,498)
CARRYING AMOUNT	654,037	656,800
FAIR VALUE	656,250	659,750
Term Loan Facility | Term Loan B due 2031
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	1,185,635	1,191,000
UNAMORTIZED DEFERRED FINANCING COSTS	(12,369)	(13,026)
CARRYING AMOUNT	1,173,266	1,177,974
FAIR VALUE	1,194,000	1,200,000
Term Loan Facility | Virginia 3 Term Loans
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	221,615	101,218
UNAMORTIZED DEFERRED FINANCING COSTS	(3,771)	(4,641)
CARRYING AMOUNT	217,844	96,577
FAIR VALUE	221,615	101,218
Term Loan Facility | Virginia 4/5 Term Loans
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	61,513	16,338
UNAMORTIZED DEFERRED FINANCING COSTS	(4,286)	(5,892)
CARRYING AMOUNT	57,227	10,446
FAIR VALUE	61,513	16,338
Term Loan Facility | Virginia 6 Term Loan
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	53,825	0
UNAMORTIZED DEFERRED FINANCING COSTS	(5,585)	0
CARRYING AMOUNT	48,240	0
FAIR VALUE	$ 53,825	0
Stated interest rate (as a percent)	5.30%
Australian Dollar Term Loan
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 191,334	197,743
UNAMORTIZED DEFERRED FINANCING COSTS	(365)	(482)
CARRYING AMOUNT	190,969	197,261
FAIR VALUE	192,498	199,195
Senior Notes | GBP Notes
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	505,836	509,254
UNAMORTIZED DEFERRED FINANCING COSTS	(1,274)	(1,763)
CARRYING AMOUNT	504,562	507,491
FAIR VALUE	$ 492,780	489,108
Stated interest rate (as a percent)	3.875%
Senior Notes | 47/8% Notes due 2027
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,000,000	1,000,000
UNAMORTIZED DEFERRED FINANCING COSTS	(4,621)	(5,332)
CARRYING AMOUNT	995,379	994,668
FAIR VALUE	$ 962,500	967,500
Stated interest rate (as a percent)	4.875%
Senior Notes | 51/4% Notes due 2028
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 825,000	825,000
UNAMORTIZED DEFERRED FINANCING COSTS	(4,428)	(5,019)
CARRYING AMOUNT	820,572	819,981
FAIR VALUE	$ 796,125	800,250
Stated interest rate (as a percent)	5.25%
Senior Notes | 5% Notes due 2028
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 500,000	500,000
UNAMORTIZED DEFERRED FINANCING COSTS	(2,954)	(3,316)
CARRYING AMOUNT	497,046	496,684
FAIR VALUE	$ 477,500	478,750
Stated interest rate (as a percent)	5%
Senior Notes | 7% Notes due 2029
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,000,000	1,000,000
UNAMORTIZED DEFERRED FINANCING COSTS	(9,750)	(10,813)
CARRYING AMOUNT	990,250	989,187
FAIR VALUE	$ 1,012,500	1,027,500
Stated interest rate (as a percent)	7%
Senior Notes | 47/8% Notes due 2029
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,000,000	1,000,000
UNAMORTIZED DEFERRED FINANCING COSTS	(7,595)	(8,318)
CARRYING AMOUNT	992,405	991,682
FAIR VALUE	$ 937,500	945,000
Stated interest rate (as a percent)	4.875%
Senior Notes | 51/4% Notes due 2030
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,300,000	1,300,000
UNAMORTIZED DEFERRED FINANCING COSTS	(9,151)	(9,903)
CARRYING AMOUNT	1,290,849	1,290,097
FAIR VALUE	$ 1,228,500	1,241,500
Stated interest rate (as a percent)	5.25%
Senior Notes | 41/2% Notes
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,100,000	1,100,000
UNAMORTIZED DEFERRED FINANCING COSTS	(8,296)	(8,917)
CARRYING AMOUNT	1,091,704	1,091,083
FAIR VALUE	$ 990,000	995,500
Stated interest rate (as a percent)	4.50%
Senior Notes | 5% Notes due 2032
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 750,000	750,000
UNAMORTIZED DEFERRED FINANCING COSTS	(10,553)	(11,206)
CARRYING AMOUNT	739,447	738,794
FAIR VALUE	$ 682,500	684,375
Stated interest rate (as a percent)	5%
Senior Notes | 55/8% Notes
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 600,000	600,000
UNAMORTIZED DEFERRED FINANCING COSTS	(4,695)	(4,985)
CARRYING AMOUNT	595,305	595,015
FAIR VALUE	$ 565,500	567,000
Stated interest rate (as a percent)	5.625%
Real Estate Mortgages, Financing Lease Liabilities and Other
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 568,267	519,907
UNAMORTIZED DEFERRED FINANCING COSTS	(638)	(403)
CARRYING AMOUNT	567,629	519,504
FAIR VALUE	$ 568,267	$ 519,907

Debt - Credit Agreement (Detail

Debt - Credit Agreement (Details)	6 Months Ended
	Jun. 30, 2024 USD ($) extension	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Outstanding borrowing	$ 13,036,654,000	$ 12,034,622,000
Term Loan Facility
Debt Instrument [Line Items]
Number of extensions | extension	2
Period of extension	1 year
Virginia 6 Term Loan | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing amount	$ 210,000,000
Outstanding borrowing	$ 53,825,000	$ 0
Contractual interest rate	2.75%
Unused commitment fee (percent)	0.75%
Stated interest rate (as a percent)	5.30%
Virginia 7 Term Loan | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing amount	$ 300,000,000
Outstanding borrowing	$ 0
Contractual interest rate	2.50%
Unused commitment fee (percent)	0.75%

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)		6 Months Ended
	Jul. 02, 2024	Jun. 30, 2024	Jun. 14, 2024	Dec. 31, 2023	Jun. 08, 2023
Debt Instrument [Line Items]
Long-term debt		$ 13,036,654,000		$ 12,034,622,000
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding		58,880,000
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		745,000,000
Letters of credit outstanding		8,898,000
Term Loan Facility | Subsequent Event
Debt Instrument [Line Items]
Payment of debt costs	$ 4,300,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Maximum borrowing capacity		400,000,000			$ 360,000,000
Long-term debt		$ 373,800,000		358,500,000
Average interest rate (as a percent)		6.40%
Accounts Receivable Securitization Program | Maximum
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 450,000,000
Term Loan B due 2031 | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,194,000,000
Variable rate		2.25%
Long-term debt		$ 1,185,635,000		1,191,000,000
Term Loan B due 2031 | Term Loan Facility | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,806,700,000
Variable rate	2%
Periodic payment	$ 4,500,000
Term Loan B due 2026 | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		656,300,000
Long-term debt		$ 655,911,000		$ 659,298,000
Term Loan B due 2026 | Term Loan Facility | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 53,400,000

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Insurance settlement
Commitments and Contingencies
Reasonably possible additional losses	$ 15,000

Stockholders' Equity Matters (D

Stockholders' Equity Matters (Details) - USD ($) $ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

Aug. 01, 2024

Jul. 05, 2024

May 02, 2024

Apr. 04, 2024

Feb. 22, 2024

Jan. 04, 2024

Nov. 02, 2023

Oct. 05, 2023

Aug. 03, 2023

Jul. 06, 2023

May 04, 2023

Apr. 05, 2023

Feb. 23, 2023

Jun. 30, 2024

Jun. 30, 2023

Jun. 30, 2024

Jun. 30, 2023

Debt Instrument [Line Items]

Dividend per share (in dollars per share)

$ 0.6500

$ 0.6500

$ 0.6500

$ 0.6500

$ 0.6185

$ 0.6185

TOTAL AMOUNT

$ 190,506

$ 189,886

$ 189,730

$ 180,493

$ 180,339

$ 192,139

$ 182,113

$ 386,635

$ 365,385

Subsequent Event

Debt Instrument [Line Items]

Dividend per share (in dollars per share)

$ 0.715

TOTAL AMOUNT

$ 190,643

Stockholders' Equity Matters -

Stockholders' Equity Matters - Additional Information (Details) - $ / shares	Aug. 01, 2024	May 02, 2024	Feb. 22, 2024	Nov. 02, 2023	Aug. 03, 2023	May 04, 2023	Feb. 23, 2023
Debt Instrument [Line Items]
Dividend per share (in dollars per share)		$ 0.6500	$ 0.6500	$ 0.6500	$ 0.6500	$ 0.6185	$ 0.6185
Subsequent Event
Debt Instrument [Line Items]
Dividend per share (in dollars per share)	$ 0.715

Segment Information - Segment R

Segment Information - Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total Revenues	$ 1,534,409	$ 1,357,936	$ 3,011,272	$ 2,672,285
Adjusted EBITDA	544,361	475,658	1,063,216	936,466
Global RIM Business
Segment Reporting Information [Line Items]
Total Revenues	1,250,577	1,159,867	2,460,734	2,286,393
Adjusted EBITDA	548,742	499,062	1,075,010	976,846
Global Data Center Business
Segment Reporting Information [Line Items]
Total Revenues	152,702	118,033	296,639	230,338
Adjusted EBITDA	66,017	53,809	127,585	104,444
Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	131,130	80,036	253,899	155,554
Adjusted EBITDA	$ (70,398)	$ (77,213)	$ (139,379)	$ (144,824)

Segment Information - Reconcili

Segment Information - Reconciliation to of Net Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reconciliation to of Net Income to Adjusted EBITDA
Net Income (Loss)	$ 34,621	$ 1,143	$ 111,646	$ 66,678
Interest expense, net	176,521	144,178	341,040	281,347
Provision (benefit) for income taxes	13,319	4,255	29,928	21,013
Depreciation and amortization	224,501	195,367	434,056	377,461
Acquisition and Integration Costs	9,502	1,511	17,311	3,106
Restructuring and other transformation	46,513	45,588	87,280	82,501
Loss (gain) on disposal/write-down of property, plant and equipment, net (including real estate)	2,790	(1,505)	3,179	(14,566)
Other expense (income), net, excluding our share of losses (gains) from our unconsolidated joint ventures	4,532	58,694	(8,578)	76,185
Stock-based compensation expense	29,889	22,373	43,928	34,882
Our share of Adjusted EBITDA reconciling items from our unconsolidated joint ventures	2,173	4,054	3,426	7,859
Adjusted EBITDA	$ 544,361	$ 475,658	$ 1,063,216	$ 936,466

Segment Information - Revenues

Segment Information - Revenues by Product and Service Lines by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total Revenues	$ 1,534,409	$ 1,357,936	$ 3,011,272	$ 2,672,285
GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	1,250,577	1,159,867	2,460,734	2,286,393
GLOBAL DATA CENTER BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	152,702	118,033	296,639	230,338
CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	131,130	80,036	253,899	155,554
Records Management
Segment Reporting Information [Line Items]
Total Revenues	1,015,476	936,043	1,991,200	1,838,379
Records Management | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	974,480	898,634	1,911,132	1,766,622
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	40,996	37,409	80,068	71,757
Data Management
Segment Reporting Information [Line Items]
Total Revenues	131,073	130,251	263,123	259,845
Data Management | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	131,073	130,251	263,123	259,845
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	235,158	173,609	460,310	343,723
Information Destruction | GLOBAL RIM BUSINESS
Segment Reporting Information [Line Items]
Total Revenues	145,024	130,982	286,479	259,926
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	90,134	42,627	173,831	83,797
Data Center
Segment Reporting Information [Line Items]
Total Revenues	152,702	118,033	296,639	230,338
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	152,702	118,033	296,639	230,338
Data Center | CORPORATE AND OTHER
Segment Reporting Information [Line Items]
Total Revenues	$ 0	$ 0	$ 0	$ 0

Related Parties (Details)

Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Related Party Transaction [Line Items]
Total Revenues	$ 1,534,409	$ 1,357,936	$ 3,011,272	$ 2,672,285
Co-venturer | Frankfurt JV Agreements
Related Party Transaction [Line Items]
Total Revenues	2,100	800	2,500	1,700
Co-venturer | Clutter Agreement
Related Party Transaction [Line Items]
Total Revenues	$ 0	$ 7,000	$ 0	$ 13,000

Restructuring And Other Trans_3

Restructuring And Other Transformation - Additional Information (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Expected cost	$ 150

Restructuring And Other Trans_4

Restructuring And Other Transformation - Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		22 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and other transformation	$ 46,513	$ 45,588	$ 87,280	$ 82,501
Project Matterhorn
Restructuring Cost and Reserve [Line Items]
Restructuring	16,336	16,127	27,062	28,084	$ 97,673
Other transformation	30,177	29,461	60,218	54,417	206,755
Restructuring and other transformation	46,513	45,588	87,280	82,501	304,428
Project Matterhorn | GLOBAL RIM BUSINESS
Restructuring Cost and Reserve [Line Items]
Restructuring	12,643	15,000	22,784	24,525	82,589
Other transformation	10,374	4,958	19,344	8,443	51,614
Project Matterhorn | GLOBAL DATA CENTER BUSINESS
Restructuring Cost and Reserve [Line Items]
Restructuring	2,572	0	2,576	78	3,096
Other transformation	1,272	498	2,663	1,368	7,685
Project Matterhorn | CORPORATE AND OTHER
Restructuring Cost and Reserve [Line Items]
Restructuring	1,121	1,127	1,702	3,481	11,988
Other transformation	$ 18,531	$ 24,005	$ 38,211	$ 44,606	$ 147,456

Restructuring and Other Trans_5

Restructuring and Other Transformation - Restructuring Rollforward (Details) - Project Matterhorn $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 35,585
Amount accrued	87,280
Payments	(102,601)
Ending balance	20,264
RESTRUCTURING
Restructuring Reserve [Roll Forward]
Beginning balance	10,731
Amount accrued	27,062
Payments	(30,867)
Ending balance	6,926
OTHER TRANSFORMATION
Restructuring Reserve [Roll Forward]
Beginning balance	24,854
Amount accrued	28,084
Payments	(71,734)
Ending balance	$ 13,338