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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 revenue44,137 
Allowance for bad debts charged to expense24,233 
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:
DESCRIPTIONJUNE 30, 2024DECEMBER 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,
DESCRIPTION2024202320242023
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 liabilities5,217 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.
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:20242023
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 leases21,536 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 BUSINESSGLOBAL DATA CENTER BUSINESSCORPORATE AND OTHERTOTAL 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 adjustments963 (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
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$10,218 $— $10,218 $— 
Time Deposits20,762 — 20,762 — 
Trading Securities8,841 7,166 1,675 — 
Derivative Assets25,607 — 25,607 — 
Derivative Liabilities2,670 — 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
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$66,008 $— $66,008 $— 
Time Deposits15,913 — 15,913 — 
Trading Securities9,952 6,149 3,803 — 
Derivative Assets6,359 — 6,359 — 
Derivative Liabilities5,769 — 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 
Additions63,700 
Payments(158,677)
Other changes, including accretion1,415 
Balance as of June 30, 2024
$114,703 
Schedule of Changes in Accumulated Other Comprehensive Items, Net
The changes in Accumulated other comprehensive items, net for the three and six months ended June 30, 2024 and 2023 are as follows:
THREE MONTHS ENDED JUNE 30, 2024THREE MONTHS ENDED JUNE 30, 2023
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTAL
Beginning of Period$(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 $(382,244)
SIX MONTHS ENDED JUNE 30, 2024SIX MONTHS ENDED JUNE 30, 2023
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTAL
Beginning of Period$(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, 2024DECEMBER 31, 2023
GROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT		GROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT
Intake Costs asset$77,922 $(38,683)$39,239 $76,150 $(39,617)$36,533 
Commissions asset178,289 (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:
DESCRIPTIONLOCATION IN BALANCE SHEETJUNE 30, 2024DECEMBER 31, 2023
Deferred revenue - CurrentDeferred revenue$329,718 $325,665 
Deferred revenue - Long-termOther Long-term Liabilities95,605 100,770 
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,
2024202320242023
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,
2024202320242023
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,
2024202320242023
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,
202420232024
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,
DESCRIPTION2024202320242023
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 Rate27.8 %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,
 2024202320242023
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—basic293,340,000 291,825,000 293,043,000 291,633,000 
Effect of dilutive potential stock options2,068,000 1,322,000 1,977,000 1,269,000 
Effect of dilutive potential RSUs and PUs430,000 380,000 509,000 386,000 
Weighted-average shares—diluted295,838,000 293,527,000 295,529,000 293,288,000 
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 calculation506,149 157,132 435,957 151,431