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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Allowance for doubtful accounts and credit memo reserves

The rollforward of the allowance for doubtful accounts and credit memo reserves is as follows:

YEAR ENDED DECEMBER 31,						BALANCE AT BEGINNING OF THE YEAR						CREDIT MEMOS CHARGED TO REVENUE						ALLOWANCE FOR BAD DEBTS CHARGED TO EXPENSE						DEDUCTIONS AND OTHER(1)						BALANCE AT END OF THE YEAR
2023						$	54,143					$	92,881					$	32,692					$	(104,954)					$	74,762
2022						62,009						62,891						13,666						(84,423)						54,143
2021						56,981						47,931						26,896						(69,799)						62,009

(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 Accrued expenses and other current liabilities

Accrued expenses and other current liabilities with items greater than 5% of total current liabilities are shown separately and consist of the following:

						DECEMBER 31,
DESCRIPTION						2023						2022
Interest						$	175,218					$	128,272
Deferred purchase obligations, purchase price holdbacks and other						171,273						7,187
Dividends						202,392						194,272
Operating lease liabilities						291,795						288,738
Other						409,581						413,441
Accrued expenses and other current liabilities						$	1,250,259					$	1,031,910

Schedule of Property, Plant and Equipment at cost

Property, plant and equipment are stated at cost and depreciated using the straight-line method with the following useful lives (in years):

DESCRIPTION			RANGE
Buildings and building improvements			5 to 40
Leasehold improvements			5 to 10 or life of the lease (whichever is shorter)
Racking			1 to 20 or life of the lease (whichever is shorter)
Warehouse equipment/vehicles			1 to 10
Furniture and fixtures			1 to 10
Computer hardware and software			2 to 5

Property, plant and equipment (including financing leases in the respective categories), at cost, consist of the following:

						DECEMBER 31,
DESCRIPTION						2023						2022
Land						$	536,780					$	486,715
Buildings and building improvements						3,819,241						3,336,778
Leasehold improvements						1,166,810						1,079,419
Racking						2,054,046						2,058,054
Warehouse equipment/vehicles						526,965						493,128
Furniture and fixtures						46,094						49,610
Computer hardware and software						601,273						585,792
Construction in progress						1,622,780						936,269
Property, plant and equipment						$	10,373,989					$	9,025,765

Schedule of Contract Fulfillment Costs and related amortization

During the years ended December 31, 2023, 2022 and 2021, capitalized interest is as follows:

						YEAR ENDED DECEMBER 31,
						2023						2022						2021
Capitalized interest						$	44,845					$	14,078					$	12,673

During the years ended December 31, 2023, 2022 and 2021, capitalized costs associated with the development of internal use computer software projects are as follows:

			YEAR ENDED DECEMBER 31,
			2023						2022						2021
Capitalized costs associated with the development of internal use computer software projects			$	64,488					$	44,152					$	48,557

Contract Costs, which are included as a component of Other within Other Assets, Net as of December 31, 2023 and 2022 are as follows:

						DECEMBER 31, 2023																		DECEMBER 31, 2022
DESCRIPTION						GROSS CARRYING AMOUNT						ACCUMULATED AMORTIZATION						NET CARRYING AMOUNT						GROSS CARRYING AMOUNT						ACCUMULATED AMORTIZATION						NET CARRYING AMOUNT
Intake Costs asset						$	76,150					$	(39,617)					$	36,533					$	68,345					$	(42,132)					$	26,213
Commissions asset						156,639						(64,279)						92,360						133,145						(58,949)						74,196

Amortization expense associated with the Intake Costs and Commissions assets for the years ended December 31, 2023, 2022 and 2021 are as follows:

						YEAR ENDED DECEMBER 31,
DESCRIPTION						2023						2022						2021
Intake Costs asset						$	18,904					$	18,117					$	17,530
Commissions asset						43,413						40,612						30,739

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 December 31, 2023 and 2022 are as follows:

						DECEMBER 31,
DESCRIPTION						2023						2022
Assets:
Operating lease right-of-use assets(1)						$	2,696,024					$	2,583,704
Financing lease right-of-use assets, net of accumulated depreciation(2)(3)						304,600						251,690
Liabilities:
Current
Operating lease liabilities						$	291,795					$	288,738
Financing lease liabilities(3)						39,089						43,857
Long-term
Operating lease liabilities						$	2,562,394					$	2,429,167
Financing lease liabilities(3)						310,776						289,048

(1)At December 31, 2023 and 2022, these assets are comprised of approximately 99% real estate related assets (which include land, buildings and racking) and 1% non-real estate related assets (which include warehouse equipment, vehicles, furniture and fixtures and computer hardware and software).

(2)At December 31, 2023, these assets are comprised of approximately 68% real estate related assets and 32% non-real estate related assets. At December 31, 2022, these assets are comprised of approximately 64% real estate related assets and 36% non-real estate related assets.

(3)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 Consolidated Balance Sheets.

Schedule of Lease terms and discount rates/Other lease information

The components of the lease expense for the years ended December 31, 2023, 2022 and 2021 are as follows:

						YEAR ENDED DECEMBER 31,
DESCRIPTION						2023						2022						2021
Operating lease cost(1)						$	660,889					$	574,115					$	545,097
Financing lease cost:
Depreciation of financing lease right-of-use assets						$	42,089					$	42,708					$	50,970
Interest expense for financing lease liabilities						18,638						17,329						19,808

(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $142,154, $119,184 and $111,949 for the years ended December 31, 2023, 2022 and 2021, respectively.

Weighted average remaining lease terms and discount rates as of December 31, 2023 and 2022 are as follows:

			DECEMBER 31, 2023												DECEMBER 31, 2022
			OPERATING LEASES						FINANCING LEASES						OPERATING LEASES						FINANCING LEASES
Remaining Lease Term			10.6 years						9.2 years						11.3 years						10.6 years
Discount Rate			6.6		%				6.1		%				6.4		%				5.8		%

Supplemental cash flow information relating to our leases for the years ended December 31, 2023, 2022 and 2021 is as follows:

						YEAR ENDED DECEMBER 31,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:						2023						2022						2021
Operating cash flows used in operating leases						$	450,412					$	409,163					$	392,987
Operating cash flows used in financing leases (interest)						18,638						17,329						19,808
Financing cash flows used in financing leases						52,284						44,869						46,118
NON-CASH ITEMS:
Operating lease modifications and reassessments						$	86,948					$	179,094					$	144,310
New operating leases (including acquisitions and sale-leaseback transactions)						306,479						540,830						282,490

Schedule of Operating lease maturity table

The estimated minimum future lease payments (receipts) as of December 31, 2023 are as follows:

YEAR						OPERATING LEASES(1)						SUBLEASE INCOME						FINANCING LEASES(1)
2024						$	468,015					$	(6,969)					$	56,901
2025						456,638						(4,282)						127,074
2026						421,535						(2,979)						40,283
2027						389,307						(3,451)						30,098
2028						344,744						(48)						55,523
Thereafter						1,970,950						(48)						117,779
Total minimum lease payments (receipts)						4,051,189						$	(17,777)					427,658
Less amounts representing interest or imputed interest						1,197,000												77,793
Present value of lease obligations						$	2,854,189											$	349,865

(1)Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes.

Schedule of Finance lease maturity table

The estimated minimum future lease payments (receipts) as of December 31, 2023 are as follows:

YEAR						OPERATING LEASES(1)						SUBLEASE INCOME						FINANCING LEASES(1)
2024						$	468,015					$	(6,969)					$	56,901
2025						456,638						(4,282)						127,074
2026						421,535						(2,979)						40,283
2027						389,307						(3,451)						30,098
2028						344,744						(48)						55,523
Thereafter						1,970,950						(48)						117,779
Total minimum lease payments (receipts)						4,051,189						$	(17,777)					427,658
Less amounts representing interest or imputed interest						1,197,000												77,793
Present value of lease obligations						$	2,854,189											$	349,865

(1)Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes.

Schedule of Long-Lived Assets Held-for-sale

Gain on disposal/write-down of property, plant and equipment, net for the years ended December 31, 2023, 2022 and 2021 is as follows:

			YEAR ENDED DECEMBER 31,
			2023			2022			2021
Gain on disposal/write-down of property, plant and equipment, net			$	12,825		$	93,268		$	172,041
The gains primarily consist of(1):			•Gains associated with sale and sale-leaseback transactions of approximately $19,500, of which approximately $18,500 relates to a sale-leaseback transaction of a facility in Singapore during the first quarter of 2023. These gains are partially offset by losses related to the disposal of assets associated with facility consolidations.			•Gains associated with sale and sale-leaseback transactions of approximately $94,500, of which (i) approximately $49,000 relates to sale and sale-leaseback transactions of 11 facilities and parcels of land in the United States during the second quarter of 2022, (ii) approximately $17,000 relates to sale-leaseback transactions of two facilities in the United States and one in Canada during the third quarter of 2022 and (iii) approximately $28,500 relates to sale and sale-leaseback transactions of 12 facilities and one parcel of land in the United States and one facility in the United Kingdom during the fourth quarter of 2022.			•Gains associated with sale and sale-leaseback transactions of approximately $164,000, of which (i) approximately $127,400 relates to sale-leaseback transactions of five facilities in the United Kingdom during the second quarter of 2021 and (ii) approximately $36,600 relates to sale and sale-leaseback transactions of nine facilities in the United States during the fourth quarter of 2021.

(1) The gains recognized during the years ended December 31, 2023, 2022 and 2021 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 Note 2.j.

Schedule of Carrying value of goodwill, net for each of the reporting units

The carrying value of goodwill, net for each of our reporting units described above as of December 31, 2022 is as follows:

SEGMENT			REPORTING UNIT			CARRYING VALUE AS OF DECEMBER 31, 2022
Global RIM Business			North America RIM			$	2,667,400
			ESA RIM			521,949
			MENAT RIM			25,007
			Latin America RIM			109,069
			APAC RIM			497,792
			Entertainment Services			31,729
Global Data Center Business			Global Data Center			418,502
Corporate and Other			Fine Arts			33,908
			ALM			577,378
Total						$	4,882,734

The carrying value of goodwill, net for each of our reporting units described above as of December 31, 2023 is as follows:

SEGMENT			REPORTING UNIT			CARRYING VALUE AS OF DECEMBER 31, 2023
Global RIM Business			North America RIM			$	2,694,093
			Europe RIM			541,860
			MENATSA RIM			26,502
			Latin America RIM			120,119
			APAC RIM			496,944
			Entertainment Services			32,427
Global Data Center Business			Global Data Center			478,930
Corporate and Other			Fine Arts			47,535
			ALM			579,502
Total						$	5,017,912

Schedule of Changes in the carrying value of goodwill attributable to each reportable operating segment

The changes in the carrying value of goodwill attributable to each reportable segment for the years ended December 31, 2023 and 2022 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, 2021			$	3,972,852					$	426,074					$	64,605					$	4,463,531
Tax deductible goodwill acquired during the year			—						—						912						912
Non-tax deductible goodwill acquired during the year			696						—						546,693						547,389
Fair value and other adjustments(1)			(12,199)						—						384						(11,815)
Currency effects			(108,403)						(7,572)						(1,308)						(117,283)
Goodwill balance, net of accumulated amortization, as of December 31, 2022			3,852,946						418,502						611,286						4,882,734
Tax deductible goodwill acquired during the year			—						—						11,928						11,928
Non-tax deductible goodwill acquired during the year			21,594						56,674						383						78,651
Fair value and other adjustments			(80)						—						2,333						2,253
Currency effects			37,485						3,754						1,107						42,346
Goodwill balance, net of accumulated amortization, as of December 31, 2023			$	3,911,945					$	478,930					$	627,037					$	5,017,912
Accumulated Goodwill Impairment Balance as of December 31, 2022			$	132,409					$	—					$	26,011					$	158,420
Accumulated Goodwill Impairment Balance as of December 31, 2023			$	132,409					$	—					$	26,011					$	158,420

(1) This amount primarily represents an adjustment to goodwill as a result of the deconsolidation of certain businesses, as described in Note 4.

Schedule of Amortizable intangible assets

The gross carrying amount and accumulated amortization of our finite-lived intangible assets as of December 31, 2023 and 2022, respectively, are as follows:

			DECEMBER 31, 2023												DECEMBER 31, 2022
DESCRIPTION			GROSS CARRYING AMOUNT			ACCUMULATED AMORTIZATION			NET CARRYING AMOUNT						GROSS CARRYING AMOUNT			ACCUMULATED AMORTIZATION			NET CARRYING AMOUNT
Assets:
Customer and supplier relationship intangible assets(1)			$	2,144,641		$	(933,084)		$	1,211,557					$	2,162,154		$	(823,392)		$	1,338,762
Customer inducements(1)			47,565			(25,562)			22,003						47,794			(26,158)			21,636
Data center lease-based intangible assets(1)(2)			141,628			(95,422)			46,206						272,649			(209,902)			62,747
Third-party commissions asset and other(3)			77,638			(39,323)			38,315						83,297			(28,581)			54,716
Liabilities:
Data center below-market leases(4)			$	10,873		$	(5,772)		$	5,101					$	12,831		$	(7,806)		$	5,025

(1)Included in Customer and supplier relationship and other intangible assets in the accompanying Consolidated Balance Sheets.

(2)Data center lease-based intangible assets includes Data Center In-Place Leases, Data Center Tenant Relationships and Data Center Above-Market Leases.

(3)Included in Other (within Other Assets, Net) in the accompanying Consolidated Balance Sheets.

(4)Included in Other long-term liabilities in the accompanying Consolidated Balance Sheets.

Schedule of Amortization expenses

Amortization expense associated with finite-lived intangible assets, revenue reduction associated with the amortization of Customer Inducements and net revenue reduction associated with the amortization of Data Center Above-Market Leases and Data Center Below-Market Leases for the years ended December 31, 2023, 2022 and 2021 is as follows:

						YEAR ENDED DECEMBER 31,
						2023						2022						2021
Amortization expense included in depreciation and amortization associated with:
Customer and supplier relationship intangible assets						$	153,128					$	156,779					$	117,761
Data center in-place leases and tenant relationships						22,322						16,955						42,333
Third-party commissions asset and other						12,541						16,148						6,987
Revenue reduction associated with amortization of:
Customer inducements and data center above-market and below-market leases						$	7,036					$	8,119					$	8,852

Schedule of Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years

Estimated amortization expense for existing finite-lived intangible assets (excluding Contract Costs, as defined and disclosed in Note 2.s.) is as follows:

						ESTIMATED AMORTIZATION
YEAR						INCLUDED IN DEPRECIATION AND AMORTIZATION						REVENUE REDUCTION ASSOCIATED WITH CUSTOMER INDUCEMENTS AND DATA CENTER ABOVE-MARKET AND BELOW-MARKET LEASES
2024						$	187,933					$	5,982
2025						173,432						3,494
2026						156,946						2,607
2027						127,284						2,096
2028						116,387						1,729
Thereafter						533,747						1,343

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 December 31, 2023 and 2022, respectively, are as follows:

												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)
Money Market Funds(1)						$	66,008					$	—					$	66,008					$	—
Time Deposits(1)						15,913						—						15,913						—
Trading Securities						9,952						6,149			(2)			3,803			(3)			—
Derivative Assets(4)						6,359						—						6,359						—
Derivative Liabilities(4)						5,769						—						5,769						—
Deferred Purchase Obligations(5)						208,265						—						—						208,265

												FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2022 USING
DESCRIPTION						TOTAL CARRYING VALUE AT DECEMBER 31, 2022						QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)						SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)						SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds(1)						$	11,311					$	—					$	11,311					$	—
Time Deposits(1)						1,102						—						1,102						—
Trading Securities						9,462						9,426			(2)			36			(3)			—
Derivative Assets(4)						51,396						—						51,396						—
Derivative Liabilities(4)						489						—						489						—
Deferred Purchase Obligations(5)						193,033						—						—						193,033

(1)Money market funds and time deposits are measured based on quoted prices for similar assets and/or subsequent transactions.

(2)Certain trading securities are measured at fair value using quoted market prices.

(3)Certain trading securities are measured based on inputs other than quoted market prices that are observable.

(4)Derivative assets and liabilities include (i) interest rate swap agreements, and (ii) cross-currency swap agreements to hedge the variability of exchange rate impacts between the United States dollar and the Euro and certain of our Euro denominated subsidiaries. Our derivative financial instruments are measured using industry standard valuation models using market-based observable inputs, including interest rate curves, forward and spot prices for currencies and implied volatilities. Credit risk is also factored into the determination of the fair value of our derivative financial instruments. See Note 6 for additional information on our derivative financial instruments.

(5)Primarily relates to the fair value of the Deferred Purchase Obligation associated with the ITRenew Transaction (each as defined in Note 3), which was determined utilizing a Monte Carlo model and takes into account our forecasted projections as it relates to the underlying performance of the business. The Monte Carlo simulation model incorporates assumptions as to expected gross profits over the applicable achievement period, including adjustments for the volatility of timing and amount of the associated revenue and costs, as well as discount rates that account for the risk of the underlying arrangement and overall market risks. Any material change to these assumptions may result in a significantly higher or lower fair value of the Deferred Purchase Obligation. During the fourth quarter of 2022, we recorded a change in the estimated fair value of the Deferred Purchase Obligation as described in Note 2.v. The change in value of the Deferred Purchase Obligation during the year ended December 31, 2023 was driven by the accretion of the obligation to present value.

Schedule of Changes in accumulated other comprehensive items, net

The changes in Accumulated other comprehensive items, net for the years ended December 31, 2023, 2022 and 2021 are as follows:

			FOREIGN CURRENCY  TRANSLATION AND OTHER ADJUSTMENTS						CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTS						TOTAL
Balance as of December 31, 2020			$	(206,190)					$	(49,703)					$	(255,893)
Other comprehensive (loss) income:
Foreign currency translation and other adjustments			(134,834)						—						(134,834)
Change in fair value of derivative instruments			—						52,380						52,380
Total other comprehensive (loss) income			(134,834)						52,380						(82,454)
Balance as of December 31, 2021			(341,024)						2,677						(338,347)
Other comprehensive (loss) income:
Foreign currency translation and other adjustments			(113,485)						—						(113,485)
Change in fair value of derivative instruments			—						9,829						9,829
Total other comprehensive (loss) income			(113,485)						9,829						(103,656)
Balance as of December 31, 2022			(454,509)						12,506						(442,003)
Other comprehensive income (loss):
Foreign currency translation and other adjustments			80,881						—						80,881
Change in fair value of derivative instruments			—						(2,454)						(2,454)
Reclassifications from Accumulated Other Comprehensive Items, net			—						(7,580)						(7,580)
Total other comprehensive income (loss)			80,881						(10,034)						70,847
Balance as of December 31, 2023			$	(373,628)					$	2,472					$	(371,156)

Schedule of Contract with customer, future amortization expense

Estimated amortization expense for Contract Costs is as follows:

YEAR						ESTIMATED AMORTIZATION
2024						$	61,379
2025						44,161
2026						23,353

Schedule of Deferred revenue liabilities

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

									DECEMBER 31,
DESCRIPTION			LOCATION IN BALANCE SHEET						2023						2022
Deferred revenue - Current			Deferred revenue						$	325,665					$	328,910
Deferred revenue - Long-term			Other Long-term Liabilities						100,770						32,960

Schedule of Revenue

Storage rental revenue associated with our Global Data Center Business for the years ended December 31, 2023, 2022 and 2021 are as follows:

						YEAR ENDED DECEMBER 31,
						2023						2022						2021
Storage rental revenue						$	474,066					$	372,208					$	289,592

Schedule of Payments to be received

The future minimum lease payments we expect to receive under non-cancellable data center operating leases for which we are the lessor, excluding month to month leases, for the next five years are as follows:

YEAR						FUTURE MINIMUM LEASE PAYMENTS
2024						$	393,046
2025						388,491
2026						375,800
2027						342,441
2028						296,270

Schedule of Stock-based compensation expense

Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2023, 2022 and 2021 is as follows:

			YEAR ENDED DECEMBER 31,
			2023						2022						2021
Stock-based compensation expense			$	73,799					$	56,861					$	61,001
Stock-based compensation expense, after tax			68,309						52,600						59,243

Schedule of Stock Option grant assumptions

These values were estimated on the date of grant using the Black-Scholes option pricing model. The assumptions used for stock option grants in the years ended December 31, 2023, 2022 and 2021 are as follows:

						YEAR ENDED DECEMBER 31,
STOCK OPTION GRANT ASSUMPTIONS						2023						2022						2021
Expected volatility(1)						29.1		%				28.0		%				28.3		%
Risk-free interest rate(2)						3.92		%				1.72		%				1.45		%
Expected dividend yield(3)						5		%				5		%				7		%
Expected life(4)						10.0 years						10.0 years						10.0 years

(1)Expected volatility is calculated utilizing daily historical volatility over a period that equates to the expected life of the option.

(2)Risk-free interest rate is based on the United States Treasury interest rates whose term is consistent with the expected life (estimated period of time outstanding) of the stock options.

(3)Expected dividend yield is considered in the option pricing model and represents our annualized expected per share dividends over the trade price of our common stock at the date of grant.

(4)Expected life of the stock options granted is estimated using the historical exercise behavior of employees.

Summary of Stock option activity

A summary of stock option activity for the year ended December 31, 2023 is as follows:

			OPTIONS						WEIGHTED AVERAGE EXERCISE PRICE						WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM (YEARS)						AGGREGATE INTRINSIC VALUE
Outstanding at December 31, 2022			4,226,319						$	36.89
Granted			157,132						52.58
Exercised			(322,854)						32.66
Outstanding at December 31, 2023			4,060,597						$	37.84					4.44						$	130,548
Options exercisable at December 31, 2023			3,619,289						$	36.85					3.98						$	119,903
Options expected to vest			441,308						$	45.86					8.20						$	10,645

Summary of Restricted stock and RSU activity

The fair value of RSUs vested during the years ended December 31, 2023, 2022 and 2021 are as follows:

			YEAR ENDED DECEMBER 31,
			2023						2022						2021
Fair value of RSUs vested			$	32,664					$	27,078					$	29,332

A summary of RSU activity for the year ended December 31, 2023 is as follows:

			RSUs						WEIGHTED-AVERAGE GRANT-DATE FAIR VALUE
Non-vested at December 31, 2022			1,306,115						$	43.43
Granted			1,035,583						53.02
Vested			(762,683)						42.83
Forfeited			(218,751)						48.63
Non-vested at December 31, 2023			1,360,264						$	50.24

Schedule of Performance stock units

The fair value of earned PUs that vested during the years ended December 31, 2023, 2022 and 2021 is as follows:

			YEAR ENDED DECEMBER 31,
			2023						2022						2021
Fair value of earned PUs that vested			$	34,896					$	20,059					$	29,701

Schedule of Performance unit (PU) activity

A summary of PU activity for the year ended December 31, 2023 is as follows:

			ORIGINAL PU AWARDS						PU ADJUSTMENT(1)						TOTAL PU AWARDS						WEIGHTED-AVERAGE GRANT-DATE FAIR VALUE
Non-vested at December 31, 2022			830,173						(484,550)						345,623						$	45.65
Granted			641,412						—						641,412						55.76
Prior year grant adjustments for performance(1)			—						160,993						160,993						42.66
Vested			(615,588)						—						(615,588)						56.69
Forfeited			(51,087)						—						(51,087)						53.60
Non-vested at December 31, 2023			804,910						(323,557)						481,353						$	43.16

(1)Represents an increase or decrease in the number of original PUs awarded based on either the final performance criteria or market condition achievement at the end of the performance period of such PUs.

Schedule of Other expense (income), net

Other expense (income), net for the years ended December 31, 2023, 2022 and 2021 consists of the following:

			YEAR ENDED DECEMBER 31,
			2023						2022						2021
Foreign currency transaction losses (gains), net(1)			$	36,799					$	(61,684)					$	(15,753)
Debt extinguishment expense			—						671						—
Other, net(2)(3)(4)			71,841						(8,768)						(177,051)
Other expense (income), net			$	108,640					$	(69,781)					$	(192,804)

(1)The gain or loss on foreign currency transactions, calculated as the difference between the historical exchange rate and the exchange rate at the applicable measurement date, includes gains or losses primarily related to (i) certain foreign currency denominated intercompany obligations of our foreign subsidiaries to us and between our foreign subsidiaries, which are not considered permanently invested, and (ii) borrowings in certain foreign currencies under the Revolving Credit Facility (as defined in Note 7).

(2)Other, net for the year ended December 31, 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 5), as well as losses on our equity method investments and the change in value of the Deferred Purchase Obligation.

(3)Other, net for the year ended December 31, 2022 consists primarily of (i) a gain of approximately $93,600 associated with the remeasurement of the Deferred Purchase Obligation to the present value of our best estimate of fair value and (ii) a gain of approximately $35,800 associated with the Clutter Transaction (as defined in Note 5), partially offset by (iii) a loss of approximately $105,800 associated with the OSG Deconsolidation (as defined in Note 4) and (iv) losses on our equity method investments.

(4)Other, net for the year ended December 31, 2021 consists primarily of (i) a gain of approximately $179,000 associated with our IPM Divestment (as defined in Note 4) and (ii) a gain of approximately $20,300 associated with the loss of control and related deconsolidation, as of May 18, 2021, of one of our wholly-owned Netherlands subsidiaries, for which we had value-added tax liability exposure that was recorded in 2019, partially offset by (iii) losses on our equity method investments.

Schedule of Basic and diluted net income (loss) per share attributable to the entity

The calculation of basic and diluted income (loss) per share for the years ended December 31, 2023, 2022 and 2021 is as follows:

			YEAR ENDED DECEMBER 31,
			2023						2022						2021
Net Income (Loss)			$	187,263					$	562,149					$	452,725
Less: Net Income (Loss) Attributable to Noncontrolling Interests			3,029						5,168						2,506
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)			$	184,234					$	556,981					$	450,219
Weighted-average shares—basic			291,936,000						290,812,000						289,457,000
Effect of dilutive potential stock options			1,435,000						1,125,068						645,886
Effect of dilutive potential RSUs and PUs			594,000						507,109						872,204
Weighted-average shares—diluted			293,965,000						292,444,177						290,975,090
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:
Basic			$	0.63					$	1.92					$	1.56
Diluted			$	0.63					$	1.90					$	1.55
Antidilutive stock options, RSUs and PUs, excluded from the calculation			81,817						305,527						1,447,722

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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X

- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

+ References

No definition available.

+ Details

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X

- Definition

Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

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