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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]  
Schedule of Allowance for Credit Loss The rollforward of the allowance for doubtful accounts and credit memo reserves for the three months ended March 31, 2025 is as follows:
Balance as of December 31, 2024
$86,712 
Credit memos charged to revenue22,089 
Allowance for bad debts charged to expense9,770 
Deductions and other(1)
(27,961)
Balance as of March 31, 2025
$90,610 
(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 March 31, 2025 and December 31, 2024 are as follows:
DESCRIPTIONMARCH 31, 2025DECEMBER 31, 2024
Assets:
Operating lease right-of-use assets$2,386,511 $2,489,893 
Financing lease right-of-use assets, net of accumulated depreciation(1)
371,912 359,265 
Liabilities:
Current
Operating lease liabilities$329,237 $315,400 
Financing lease liabilities(1)
130,980 128,397 
Long-term
Operating lease liabilities$2,224,080 $2,334,826 
Financing lease liabilities(1)
292,185 278,444 
(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 months ended March 31, 2025 and 2024 are as follows:
THREE MONTHS ENDED MARCH 31,
DESCRIPTION20252024
Operating lease cost(1)
$173,308 $171,746 
Financing lease cost:
Depreciation of financing lease right-of-use assets$13,732 $10,944 
Interest expense for financing lease liabilities6,129 5,221 
(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $46,405 and $38,094 for the three months ended March 31, 2025 and 2024, respectively.
Supplemental cash flow information relating to our leases for the three months ended March 31, 2025 and 2024 is as follows:
THREE MONTHS ENDED MARCH 31,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:20252024
Operating cash flows used in operating leases$119,511 $117,336 
Operating cash flows used in financing leases (interest)6,129 5,221 
Financing cash flows used in financing leases13,348 10,679 
NON-CASH ITEMS:
Operating lease modifications and reassessments$(85,512)$(262)
New operating leases (including acquisitions)38,417 64,556 
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 three months ended March 31, 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— — 20,713 20,713 
Fair value and other adjustments— — (1,259)(1,259)
Currency effects32,041 5,223 1,275 38,539 
Goodwill balance, net of accumulated amortization, as of March 31, 2025
$3,848,915 $474,684 $818,211 $5,141,810 
Accumulated goodwill impairment balance as of March 31, 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 March 31, 2025 and December 31, 2024 are as follows:
  
FAIR VALUE MEASUREMENTS AT MARCH 31, 2025 USING
DESCRIPTION
TOTAL CARRYING
VALUE AT
MARCH 31, 2025
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$1,674 $— $1,674 $— 
Time Deposits16,254 — 16,254 — 
Trading Securities8,272 6,507 1,765 — 
Derivative Assets7,714 — 7,714 — 
Derivative Liabilities17,060 — 17,060 — 
Deferred Purchase Obligations(1)
106,001 — — 106,001 
  FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2024 USING
DESCRIPTION
TOTAL CARRYING
VALUE AT
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 March 31, 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 March 31, 2025:
Balance as of December 31, 2024
$147,055 
Additions2,880 
Payments(49,215)
Other changes, including accretion5,281 
Balance as of March 31, 2025
$106,001 
Schedule of Changes in Accumulated Other Comprehensive Items, Net
The changes in Accumulated other comprehensive items, net for the three months ended March 31, 2025 and 2024 are as follows:
THREE MONTHS ENDED MARCH 31, 2025
THREE MONTHS ENDED MARCH 31, 2024
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTAL
Beginning of Period$(568,129)$(1,823)$(569,952)$(373,628)$2,472 $(371,156)
Other comprehensive income (loss):
Foreign currency translation and other adjustments74,576 — 74,576 (66,501)— (66,501)
Change in fair value of interest rate swaps— (6,993)(6,993)— 11,388 11,388 
Reclassifications from accumulated other comprehensive items, net— — — — (2,528)(2,528)
Total other comprehensive income (loss)74,576 (6,993)67,583 (66,501)8,860 (57,641)
End of Period$(493,553)$(8,816)$(502,369)$(440,129)$11,332 $(428,797)
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 March 31, 2025 and December 31, 2024 are as follows:
MARCH 31, 2025DECEMBER 31, 2024
DESCRIPTIONGROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT		GROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT
Intake Costs asset$92,832 $(44,830)$48,002 $89,057 $(43,783)$45,274 
Commissions asset212,688 (83,943)128,745 200,149 (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 SHEETMARCH 31, 2025
DECEMBER 31, 2024(1)
Deferred revenue—Current(2)
Deferred revenue$333,171 $326,882 
Deferred revenue—Long-term(3)
Other Long-term Liabilities118,129 110,601 
(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 $21,200 and $25,500 as of March 31, 2025 and December 31, 2024, respectively.
(3)    The long-term deferred revenue accounted for under ASC 842 is approximately $101,600 and $95,000 as of March 31, 2025 and December 31, 2024, respectively.
Schedule of Revenue Storage rental revenue associated with our Global Data Center Business for the three months ended March 31, 2025 and 2024 is as follows:
THREE MONTHS ENDED MARCH 31,
20252024
Storage rental revenue$172,945 $140,028 
Schedule of Stock-based Compensation Expense
Stock-based compensation expense for the Employee Stock-Based Awards for the three months ended March 31, 2025 and 2024 is as follows:
THREE MONTHS ENDED MARCH 31,
20252024
Stock-based compensation expense$26,094 $14,039 
Schedule of Acquisition and Integration Costs
Acquisition and Integration Costs for the three months ended March 31, 2025 and 2024 are as follows:
THREE MONTHS ENDED MARCH 31,
20252024
Acquisition and Integration Costs$5,823 $7,809 
Schedule of (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 months ended March 31, 2025 and 2024 is as follows:
THREE MONTHS ENDED MARCH 31,
20252024
Loss (gain) on disposal/write-down of property, plant and equipment, net
$5,571 $389 
Schedule of Other Expense (Income), Net
Other expense (income), net for the three months ended March 31, 2025 and 2024 consists of the following:
 THREE MONTHS ENDED MARCH 31,
DESCRIPTION20252024
Foreign currency transaction losses (gains), net(1)
$29,663 $(16,379)
Other, net(1,175)3,849 
Other Expense (Income), Net
$28,488 $(12,530)
(1)The losses for the three months ended March 31, 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 months ended March 31, 2025 and 2024 are as follows:
 THREE MONTHS ENDED MARCH 31,
2025(1)
2024(2)
Effective Tax Rate47.8 %17.7 %
(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 March 31, 2025 were the lack of tax benefits recognized for the ordinary losses, disallowed interest expenses of certain entities and losses we recorded in Other expense (income), net during the period, 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 March 31, 2024 were 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 income (loss) per share for the three months ended March 31, 2025 and 2024 are as follows:
 THREE MONTHS ENDED MARCH 31,
 20252024
Net Income (Loss)$16,233 $77,025 
Less: Net Income (Loss) Attributable to Noncontrolling Interests281 2,964 
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)$15,952 $74,061 
Weighted-average shares—basic294,507,000 292,746,000 
Effect of dilutive potential stock options2,162,000 1,886,000 
Effect of dilutive potential RSUs and PUs591,000 589,000 
Weighted-average shares—diluted297,260,000 295,221,000 
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:  
 Basic$0.05 $0.25 
 Diluted$0.05 $0.25 
Antidilutive stock options, RSUs and PUs excluded from the calculation98,685 365,764