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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2025
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, 2025 is as follows:
Balance as of December 31, 2024
$86,712 
Credit memos charged to revenue47,315 
Allowance for bad debts charged to expense29,610 
Deductions and other(1)
(61,740)
Balance as of June 30, 2025
$101,897 
(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, 2025 and December 31, 2024 are as follows:
DESCRIPTIONJUNE 30, 2025DECEMBER 31, 2024
Assets:
Operating lease right-of-use assets$2,414,510 $2,489,893 
Financing lease right-of-use assets, net of accumulated depreciation(1)
474,708 359,265 
Liabilities:
Current
Operating lease liabilities$309,960 $315,400 
Financing lease liabilities(1)
134,619 128,397 
Long-term
Operating lease liabilities$2,254,841 $2,334,826 
Financing lease liabilities(1)
371,509 278,444 
(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, 2025 and 2024 are as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
DESCRIPTION2025202420252024
Operating lease cost(1)
$179,831 $172,735 $353,139 $344,481 
Financing lease cost:
Depreciation of financing lease right-of-use assets$15,246 $12,078 $28,978 $23,022 
Interest expense for financing lease liabilities7,325 5,217 13,454 10,438 
(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $47,261 and $93,666 for the three and six months ended June 30, 2025, respectively, and $39,594 and $77,688 for the three and six months ended June 30, 2024, respectively.
Supplemental cash flow information relating to our leases for the six months ended June 30, 2025 and 2024 is as follows:
SIX MONTHS ENDED JUNE 30,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:20252024
Operating cash flows used in operating leases$244,840 $235,030 
Operating cash flows used in financing leases (interest)13,454 10,438 
Financing cash flows used in financing leases27,242 21,536 
NON-CASH ITEMS:
Operating lease modifications and reassessments$(21,629)$573 
New operating leases (including acquisitions)58,717 80,474 
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 8) for the six months ended June 30, 2025 are as follows:
GLOBAL RIM BUSINESSGLOBAL DATA CENTER BUSINESSCORPORATE AND OTHERTOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization, as of December 31, 2024
$3,816,874 $469,461 $797,482 $5,083,817 
Tax deductible goodwill acquired during the period— — 17,423 17,423 
Fair value and other adjustments— — (1,126)(1,126)
Currency effects110,136 16,013 3,680 129,829 
Goodwill balance, net of accumulated amortization, as of June 30, 2025
$3,927,010 $485,474 $817,459 $5,229,943 
Accumulated goodwill impairment balance as of June 30, 2025
$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 and measured on a recurring basis as of June 30, 2025 and December 31, 2024 are as follows:
  
FAIR VALUE MEASUREMENTS AS OF JUNE 30, 2025 USING
DESCRIPTION
TOTAL CARRYING
VALUE AS OF
JUNE 30, 2025
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$3,335 $— $3,335 $— 
Time Deposits11,650 — 11,650 — 
Trading Securities8,696 6,911 1,785 — 
Derivative Assets993 — 993 — 
Derivative Liabilities77,324 — 77,324 — 
Deferred Purchase Obligations(1)
99,548 — — 99,548 
  FAIR VALUE MEASUREMENTS AS OF DECEMBER 31, 2024 USING
DESCRIPTION
TOTAL CARRYING
VALUE AS OF
DECEMBER 31, 2024
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$2,488 $— $2,488 $— 
Time Deposits9,612 — 9,612 — 
Trading Securities8,144 6,390 1,754 — 
Derivative Assets28,092 — 28,092 — 
Derivative Liabilities5,326 — 5,326 — 
Deferred Purchase Obligations(1)
147,055 — — 147,055 
(1)The balance as of June 30, 2025 primarily relates to the fair value of the deferred purchase obligation associated with the Regency Transaction (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report). The balance as of December 31, 2024 primarily relates to the fair values of the deferred purchase obligations associated with the Regency Transaction and ITRenew Transaction (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report).
(2)The following is a rollforward of the Level 3 liabilities presented above for December 31, 2024 through June 30, 2025:
Balance as of December 31, 2024
$147,055 
Additions2,880 
Payments(49,215)
Other changes, including accretion(1,172)
Balance as of June 30, 2025
$99,548 
Schedule of Changes in Accumulated Other Comprehensive Items, Net
The changes in Accumulated other comprehensive items, net for the three and six months ended June 30, 2025 and 2024 are as follows:
THREE MONTHS ENDED JUNE 30, 2025
THREE MONTHS ENDED JUNE 30, 2024
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTAL
Beginning of Period$(493,553)$(8,816)$(502,369)$(440,129)$11,332 $(428,797)
Other comprehensive income (loss):
Foreign currency translation and other adjustments139,811 — 139,811 (31,806)— (31,806)
Change in fair value of interest rate swaps— (1,025)(1,025)— (488)(488)
Total other comprehensive income (loss)139,811 (1,025)138,786 (31,806)(488)(32,294)
End of Period$(353,742)$(9,841)$(363,583)$(471,935)$10,844 $(461,091)
SIX MONTHS ENDED JUNE 30, 2025
SIX MONTHS ENDED JUNE 30, 2024
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTAL
Beginning of Period$(568,129)$(1,823)$(569,952)$(373,628)$2,472 $(371,156)
Other comprehensive income (loss):
Foreign currency translation and other adjustments214,387 — 214,387 (98,307)— (98,307)
Change in fair value of interest rate swaps— (8,018)(8,018)— 10,900 10,900 
Reclassifications from accumulated other comprehensive items, net— — — — (2,528)(2,528)
Total other comprehensive income (loss)214,387 (8,018)206,369 (98,307)8,372 (89,935)
End of Period$(353,742)$(9,841)$(363,583)$(471,935)$10,844 $(461,091)
Schedule of Cost and Accumulated Amortization Associated with Contract Fulfillment Costs Contract Costs are primarily made up of Intake Costs and Commissions (each as defined in Note 2.s. to Notes to Consolidated Financial Statements included in our Annual Report). Contract Costs as of June 30, 2025 and December 31, 2024 are as follows:
JUNE 30, 2025DECEMBER 31, 2024
DESCRIPTIONGROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT		GROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT
Intake Costs asset$100,986 $(47,968)$53,018 $89,057 $(43,783)$45,274 
Commissions asset226,090 (96,793)129,297 200,149 (78,955)121,194 
Schedule of Deferred Revenue Liabilities
Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows:
DESCRIPTIONLOCATION IN BALANCE SHEETJUNE 30, 2025
DECEMBER 31, 2024(1)
Deferred revenue—Current(2)
Deferred revenue$342,225 $326,882 
Deferred revenue—Long-term(3)
Other Long-term Liabilities142,293 110,601 
(1)    The beginning balance of current and long-term deferred revenue for the year ended December 31, 2024 was $325,665 and $100,770, respectively.
(2)    The current deferred revenue accounted for under Accounting Standards Codification 842, Leases ("ASC 842") is approximately $30,700 and $25,500 as of June 30, 2025 and December 31, 2024, respectively.
(3)    The long-term deferred revenue accounted for under ASC 842 is approximately $119,800 and $95,000 as of June 30, 2025 and December 31, 2024, respectively.
Schedule of Revenue Storage rental revenue associated with our Global Data Center Business for the three and six months ended June 30, 2025 and 2024 is as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2025202420252024
Storage rental revenue$188,279 $147,397 $361,224 $287,425 
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, 2025 and 2024 is as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2025202420252024
Stock-based compensation expense$60,354 $29,889 $86,448 $43,928 
Schedule of Acquisition and Integration Costs
Acquisition and Integration Costs for the three and six months ended June 30, 2025 and 2024 are as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2025202420252024
Acquisition and Integration Costs$4,815 $9,502 $10,638 $17,311 
Schedule of (Loss) Gain on Disposal/Write-Down of Property, Plant and Equipment, Net
(Gain) loss on disposal/write-down of property, plant and equipment, net for the three and six months ended June 30, 2025 and 2024 are as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2025202420252024
(Gain) loss on disposal/write-down of property, plant and equipment, net
$(962)$2,790 $4,609 $3,179 
Schedule of Other Expense (Income), Net
Other expense (income), net for the three and six months ended June 30, 2025 and 2024 consists of the following:
 THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
DESCRIPTION2025202420252024
Foreign currency transaction losses (gains), net(1)
$87,155 $1,013 $116,818 $(15,366)
Other, net(5,278)4,820 (6,453)8,669 
Other Expense (Income), Net
$81,877 $5,833 $110,365 $(6,697)
(1)The losses for the three and six months ended June 30, 2025 primarily consist of the impact of changes in the exchange rate of the British pound sterling and the Euro against the United States dollar on our intercompany balances with and between certain of our subsidiaries.
Schedule of Income Taxes Our effective tax rates for the three and six months ended June 30, 2025 and 2024 are as follows:
 THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2025(1)
2024(2)
2025(1)
2024
Effective Tax Rate60.3 %27.8 %773.6 %21.1 %
(1)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three and six months ended June 30, 2025 were the lack of tax benefits recognized for the foreign exchange losses we recorded in Other expense (income), net, during the period, disallowed interest expenses of certain entities, as well as the differences in the tax rates to which our foreign earnings are subject, partially offset by the benefits derived from the dividends paid deduction.
(2)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended June 30, 2024 were the lack of tax benefits recognized for the year to date ordinary losses of certain entities, the benefits derived from the dividends paid deduction and the differences in the tax rates to which our foreign earnings are subject.
Schedule of Basic and Diluted Net Income (Loss) Per Share Attributable to the Entity
The calculations of basic and diluted (loss) income per share for the three and six months ended June 30, 2025 and 2024 are as follows:
 THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
 2025202420252024
Net (Loss) Income$(43,340)$34,621 $(27,107)$111,646 
Less: Net Income (Loss) Attributable to Noncontrolling Interests1,581 (1,162)1,862 1,802 
Net (Loss) Income Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)$(44,921)$35,783 $(28,969)$109,844 
Weighted-average shares—basic295,364,000 293,340,000 294,935,000 293,043,000 
Effect of dilutive potential stock options— 2,068,000 — 1,977,000 
Effect of dilutive potential RSUs and PUs— 430,000 — 509,000 
Weighted-average shares—diluted295,364,000 295,838,000 294,935,000 295,529,000 
Net (Loss) Income Per Share Attributable to Iron Mountain Incorporated: 
 Basic$(0.15)$0.12 $(0.10)$0.37 
 Diluted$(0.15)$0.12 $(0.10)$0.37 
Antidilutive stock options, RSUs and PUs excluded from the calculation2,413,370 506,149 2,632,028 435,957