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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Schedule of allowance for credit loss Rollforward of allowance for doubtful accounts and credit memo reserves for the six months ended June 30, 2021 is as follows:
Balance as of December 31, 2020$56,981 
Credit memos charged to revenue21,699 
Allowance for bad debts charged to expense13,442 
Deductions and other(1)
(35,145)
Balance as of June 30, 2021$56,977 
(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, 2021 and December 31, 2020 are as follows:
DESCRIPTIONJUNE 30, 2021DECEMBER 31, 2020
Assets:
Operating lease right-of-use assets$2,342,197 $2,196,502 
Financing lease right-of-use assets, net of accumulated depreciation(1)
297,052 310,534 
Liabilities:
Current
Operating lease liabilities$263,784 $250,239 
Financing lease liabilities(1)
43,728 43,149 
Long-term
Operating lease liabilities2,186,625 2,044,598 
Financing lease liabilities(1)
308,895 323,162 
(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, cost
The components of the lease expense for the three and six months ended June 30, 2021 and 2020 are as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
DESCRIPTION2021202020212020
Operating lease cost(1)
$135,086 $119,277 $267,761 $242,566 
Financing lease cost:
Depreciation of financing lease right-of-use assets$12,408 $12,567 $25,056 $25,522 
Interest expense for financing lease liabilities4,910 4,929 9,885 9,773 
(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $29,219 and $57,587 for the three and six months ended June 30, 2021, respectively, and $26,996 and $54,801 for the three and six months ended June 30, 2020, respectively.
Supplemental cash flow information relating to our leases for the six months ended June 30, 2021 and 2020 is as follows:
SIX MONTHS ENDED JUNE 30,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:20212020
Operating cash flows used in operating leases$192,039 $178,011 
Operating cash flows used in financing leases (interest)9,885 9,773 
Financing cash flows used in financing leases23,656 23,953 
NON-CASH ITEMS:
Operating lease modifications and reassessments$63,047 $76,764 
New operating leases (including acquisitions and sale-leaseback transactions)210,881 123,860 
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 operating segment for the six months ended June 30, 2021 are as follows:
GLOBAL RIM BUSINESSGLOBAL DATA CENTER BUSINESSCORPORATE AND OTHER BUSINESSTOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization as of December 31, 2020$4,024,182 $436,987 $96,440 $4,557,609 
Non-tax deductible goodwill acquired during the period6,108 — 8,807 14,915 
Goodwill allocated to IPM Divestment (as defined and described in Note 4)— — (46,105)(46,105)
Fair value and other adjustments(6,091)— (1,268)(7,359)
Currency effects(5,598)(4,573)(135)(10,306)
Goodwill balance, net accumulated amortization as of June 30, 2021$4,018,601 $432,414 $57,739 $4,508,754 
Accumulated goodwill impairment balance as of June 30, 2021$132,409 $— $26,011 $158,420 
Schedule of equity method investments The carrying values and equity interests in our joint ventures at June 30, 2021 and December 31, 2020 are as follows:
JUNE 30, 2021DECEMBER 31, 2020
CARRYING VALUEEQUITY INTERESTCARRYING VALUEEQUITY INTEREST
Web Werks JV
$50,135 38 %$— — %
Joint venture with AGC Equity Partners (the “Frankfurt JV”)
26,387 20 %26,500 20 %
Joint venture with MakeSpace Labs, Inc. (the “MakeSpace JV”)
24,069 45 %16,924 39 %
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, 2021 and December 31, 2020 are as follows:
  FAIR VALUE MEASUREMENTS AT JUNE 30, 2021 USING
DESCRIPTIONTOTAL CARRYING
VALUE AT
JUNE 30, 2021
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)
SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)
Money Market Funds$160,100 $— $160,100 $— 
Time Deposits3,130 — 3,130 — 
Trading Securities12,672 12,431  241  — 
Derivative Liabilities28,863 — 28,863 — 
  FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2020 USING
DESCRIPTIONTOTAL CARRYING
VALUE AT
DECEMBER 31, 2020
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)
SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)
Money Market Funds$62,657 $— $62,657 $— 
Time Deposits2,121 — 2,121 — 
Trading Securities10,892 10,636  256  — 
Derivative Liabilities49,703 — 49,703 — 
Schedule of changes in accumulated other comprehensive items, net
The changes in accumulated other comprehensive items, net for the three and six months ended June 30, 2021 and 2020 are as follows:
THREE MONTHS ENDED JUNE 30, 2021SIX MONTHS ENDED JUNE 30, 2021
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS
CHANGE IN FAIR VALUE OF
DERIVATIVE
INSTRUMENTS
TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS
CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTSTOTAL
Beginning of Period$(272,414)$(34,497)$(306,911)$(206,190)$(49,703)$(255,893)
Other comprehensive income (loss):
Foreign currency translation and other adjustments42,624 — 42,624 (23,600)— (23,600)
Change in fair value of derivative instruments— 5,634 5,634 — 20,840 20,840 
Total other comprehensive income (loss)42,624 5,634 48,258 (23,600)20,840 (2,760)
End of Period$(229,790)$(28,863)$(258,653)$(229,790)$(28,863)$(258,653)
THREE MONTHS ENDED JUNE 30, 2020SIX MONTHS ENDED JUNE 30, 2020
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS
CHANGE IN FAIR VALUE OF
DERIVATIVE
INSTRUMENTS
TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS
CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTSTOTAL
Beginning of Period$(475,130)$(18,118)$(493,248)$(252,825)$(9,756)$(262,581)
Other comprehensive income (loss):
Foreign currency translation and other adjustments68,686 — 68,686 (153,619)— (153,619)
Change in fair value of derivative instruments— (2,961)(2,961)— (11,323)(11,323)
Total other comprehensive income (loss) 68,686 (2,961)65,725 (153,619)(11,323)(164,942)
End of Period$(406,444)$(21,079)$(427,523)$(406,444)$(21,079)$(427,523)
Schedule of cost and accumulated amortization associated with contract fulfillment costs
The costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to obtain or fulfill customer contracts (collectively, “Contract Fulfillment Costs”). Contract Fulfillment Costs as of June 30, 2021 and December 31, 2020 are as follows:
JUNE 30, 2021DECEMBER 31, 2020
GROSS
CARRYING
AMOUNT
ACCUMULATED
AMORTIZATION
NET
CARRYING
AMOUNT
GROSS
CARRYING
AMOUNT
ACCUMULATED
AMORTIZATION
NET
CARRYING
AMOUNT
Intake Costs asset$70,263 $(39,083)$31,180 $63,721 $(33,352)$30,369 
Commissions asset104,184 (45,898)58,286 91,069 (38,787)52,282 
Schedule of deferred revenue liabilities
Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows:
DESCRIPTIONLOCATION IN BALANCE SHEETJUNE 30, 2021DECEMBER 31, 2020
Deferred revenue - CurrentDeferred revenue$256,245 $295,785 
Deferred revenue - Long-termOther Long-term Liabilities34,502 35,612 
Schedule of revenue
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 Update ("ASU") No. 2016-02, Leases (Topic 842), as amended. Storage rental revenue, including revenue associated with power and connectivity, associated with our Global Data Center Business for the three and six months ended June 30, 2021 and 2020 are as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2021202020212020
Storage rental revenue(1)
$71,237 $63,812 $138,394 $128,407 
(1)Revenue associated with power and connectivity included within storage rental revenue was $14,561 and $27,694 for the three and six months ended June 30, 2021, respectively, and $11,540 and $22,953 for the three and six months ended June 30, 2020, respectively.
Schedule of stock-based compensation expense
Stock-based compensation expense for the cost of stock options, restricted stock units (“RSUs”), performance units (“PUs”) and shares of stock issued under our employee stock purchase plan (collectively, “Employee Stock-Based Awards”) for the three and six months ended June 30, 2021 and 2020 is as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2021202020212020
Stock-based compensation expense$22,699 $20,145 $33,652 $26,672 
Schedule of vested and expected to vest
The fair value of RSUs and earned PUs that vested during the three and six months ended June 30, 2021 and 2020 is as follows:
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
 2021202020212020
Fair value of RSUs vested$3,118 $3,266 $22,979 $21,645 
Fair value of earned PUs that vested235 161 5,826 11,051 
Schedule of components of gain/loss on sale/disposal of property, plant and equipment
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2021(1)
2020
2021(1)
2020
(Gain) Loss on disposal/write-down of property, plant and equipment, net$(128,935)$(1,275)$(133,386)$(2,330)
(1)    The gains for the three and six months ended June 30, 2021 primarily consisted of gains of approximately $127,400 associated with the sale-leaseback transactions of five facilities in the United Kingdom, as part of our program to monetize a small portion of our industrial assets. The terms for these leases are consistent with the terms of our lease portfolio, which are disclosed in detail in Note 2.i. to Notes to Consolidated Financial Statements included in our Annual Report.
Schedule of other (income) expense, net
Consolidated other (income) expense, net for the three and six months ended June 30, 2021 and 2020 consists of the following:
 THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
DESCRIPTION2021202020212020
Foreign currency transaction losses (gains), net$4,729 $1,471 $7,043 $(35,928)
Debt extinguishment expense— 17,040 — 17,040 
Other, net(1)
(190,959)7,189 (188,560)1,862 
Other (Income) Expense, Net$(186,230)$25,700 $(181,517)$(17,026)
(1)Other, net for the three and six months ended June 30, 2021 is primarily comprised of (a) a gain of approximately $181,200 associated with our IPM Divestment (as defined in Note 4) and (b) 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.
Schedule of income taxes
Our effective tax rates for the three and six months ended June 30, 2021 and 2020 are as follows:
 THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2021(1)
2020(2)
2021(1)
2020(3)
Effective Tax Rate28.5 %— %27.9 %25.1 %
(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, 2021 were the impacts of differences in the tax rates at which our foreign earnings are subject and a discrete tax expense of approximately $12,000 primarily resulting from a tax law change in the United Kingdom, partially offset by the benefits derived from the dividends paid deduction.
(2)For the three months ended June 30, 2020, we had a provision for income taxes of $9,683 and net income before provision for income taxes of $2,570; as such, our effective tax rate is not meaningful.
(3)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the six months ended June 30, 2020 were the impacts of differences in the tax rates at which our foreign earnings are subject, partially offset by the benefits derived from the dividends paid deduction.
Schedule of calculation 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 three and six months ended June 30, 2021 and 2020 are as follows:
 
THREE MONTHS ENDED
JUNE 30,
SIX MONTHS ENDED
JUNE 30,
 2021202020212020
Net Income (Loss)$276,522 $(7,113)$323,153 $57,779 
Less: Net Income (Loss) Attributable to Noncontrolling Interests1,237 (27)2,265 890 
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)$275,285 $(7,086)$320,888 $56,889 
Weighted-average shares—basic289,247,000 288,071,000 289,001,000 287,955,000 
Effect of dilutive potential stock options641,888 — 349,163 35,706 
Effect of dilutive potential RSUs and PUs1,190,357 — 953,104 309,911 
Weighted-average shares—diluted291,079,245 288,071,000 290,303,267 288,300,617 
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:    
 Basic$0.95 $(0.02)$1.11 $0.20 
 Diluted$0.95 $(0.02)$1.11 $0.20 
Antidilutive stock options, RSUs and PUs, excluded from the calculation381,900 6,836,239 2,544,984 6,174,977