10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 2021
OR
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from ________ to ________

Commission File Number: 001-37552

WILLSCOT MOBILE MINI HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware	82-3430194
(State or other jurisdiction of incorporation)	(I.R.S. Employer Identification No.)

4646 E Van Buren St., Suite 400

Phoenix, Arizona 85008

(Address, including zip code, of principal executive offices)

(480) 894-6311

(Registrant’s telephone number, including area code)

(Former Name or Former Address, if Changed Since Last Report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	WSC	The Nasdaq Capital Market
Warrants to purchase Common Stock(1)	WSCTW	OTC Markets Group Inc.

(1) Issued in connection with the registrant's acquisition of Modular Space Holding, Inc. in August 2018, which are exercisable for one share of the registrant's common stock at an exercise price of $15.50 per share.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulations S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒	Accelerated filer ☐
Non-accelerated filer ☐	Smaller reporting company ☐
	Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒

Shares of Common Stock, par value $0.0001 per share, outstanding: 223,153,746 shares at November 1, 2021.

WILLSCOT MOBILE MINI HOLDINGS CORP.

Quarterly Report on Form 10-Q

Table of Contents

PART I Financial Information
	Item 1	Financial Statements (unaudited, except as noted below)
			Condensed Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020 (audited)
			Condensed Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2021 and 2020
			Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three and Nine Months Ended September 30, 2021 and 2020
			Condensed Consolidated Statements of Changes in Equity for the Three and Nine Months Ended September 30, 2021 and 2020
			Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2021 and 2020
			Notes to the Condensed Consolidated Financial Statements
	Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations
	Item 3	Quantitative and Qualitative Disclosures About Market Risk
	Item 4	Controls and Procedures
PART II Other Information
	Item 1	Legal Proceedings
	Item 1A	Risk Factors
	Item 2	Unregistered Sales of Equity Securities and Use of Proceeds
	Item 3	Defaults Upon Senior Securities
	Item 4	Mine Safety Disclosures
	Item 5	Other Information
	Item 6	Exhibits
SIGNATURE

2

ITEM 1.    Financial Statements

WillScot Mobile Mini Holdings Corp.

Condensed Consolidated Balance Sheets

(in thousands, except share data)	September 30, 2021 (unaudited)		December 31, 2020
Assets
Cash and cash equivalents	$	11,317	$	24,937
Trade receivables, net of allowances for credit losses at September 30, 2021 and December 31, 2020 of $41,867 and $29,258, respectively	398,350		330,942
Inventories	30,943		23,731
Prepaid expenses and other current assets	35,940		29,954
Assets held for sale	962		12,004
Total current assets	477,512		421,568
Rental equipment, net	2,968,895		2,931,646
Property, plant and equipment, net	307,253		303,650
Operating lease assets	233,800		232,094
Goodwill	1,178,290		1,171,219
Intangible assets, net	467,289		495,947
Other non-current assets	11,142		16,081
Total long-term assets	5,166,669		5,150,637
Total assets	$	5,644,181	$	5,572,205
Liabilities and equity
Accounts payable	$	145,320	$	106,926
Accrued expenses	163,339		141,672
Deferred revenue and customer deposits	163,977		135,485
Operating lease liabilities - current	50,552		48,063
Current portion of long-term debt	18,652		16,521
Total current liabilities	541,840		448,667
Long-term debt	2,598,300		2,453,809
Deferred tax liabilities	346,687		307,541
Operating lease liabilities - non-current	183,035		183,761
Common stock warrant liabilities	—		77,404
Other non-current liabilities	17,735		37,150
Long-term liabilities	3,145,757		3,059,665
Total liabilities	3,687,597		3,508,332
Commitments and contingencies (see Note 17)
Preferred Stock: $0.0001 par, 1,000,000 shares authorized and zero shares issued and outstanding at September 30, 2021 and December 31, 2020	—		—
Common Stock: $0.0001 par, 500,000,000 shares authorized and 223,665,627 and 229,038,158 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	23		23
Additional paid-in-capital	3,655,587		3,852,291
Accumulated other comprehensive loss	(33,713)		(37,207)
Accumulated deficit	(1,665,313)		(1,751,234)
Total shareholders' equity	1,956,584		2,063,873
Total liabilities and equity	$	5,644,181	$	5,572,205

See the accompanying notes which are an integral part of these condensed consolidated financial statements.

3

WillScot Mobile Mini Holdings Corp.

Condensed Consolidated Statements of Operations

(Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands, except share and per share data)	2021		2020		2021		2020
Revenues:
Leasing and services revenue:
Leasing	$	363,396	$	300,082	$	1,022,237	$	678,577
Delivery and installation	99,699		84,694		274,883		187,404
Sales revenue:
New units	15,860		19,360		37,823		38,736
Rental units	11,597		13,179		42,034		25,281
Total revenues	490,552		417,315		1,376,977		929,998
Costs:
Costs of leasing and services:
Leasing	82,448		64,788		235,375		162,344
Delivery and installation	80,991		66,354		228,280		153,742
Costs of sales:
New units	11,499		12,935		25,660		25,469
Rental units	5,603		8,837		22,870		16,446
Depreciation of rental equipment	56,462		54,837		175,053		146,279
Gross profit	253,549		209,564		689,739		425,718
Expenses:
Selling, general and administrative	133,424		112,079		372,296		241,269
Transaction costs	303		52,191		1,147		63,241
Other depreciation and amortization	18,814		16,867		58,760		22,824
Lease impairment expense and other related charges	601		944		2,328		3,999
Restructuring costs	1,856		3,854		11,958		4,543
Currency losses (gains), net	127		(371)		196		147
Other expense (income), net	1,476		(1,012)		207		(1,757)
Operating income	96,948		25,012		242,847		91,452
Interest expense	29,201		33,034		88,377		89,810
Fair value loss (gain) on common stock warrant liabilities	—		22,303		26,597		(46,063)
Loss on extinguishment of debt	—		42,401		5,999		42,401
Income (loss) before income tax	67,747		(72,726)		121,874		5,304
Income tax expense (benefit)	6,644		(66,675)		35,953		(66,170)
Net income (loss)	61,103		(6,051)		85,921		71,474
Net income attributable to non-controlling interest, net of tax	—		—		—		1,213
Net income (loss) attributable to WillScot Mobile Mini	$	61,103	$	(6,051)	$	85,921	$	70,261
Earnings (loss) per share attributable to WillScot Mobile Mini common shareholders
Basic	$	0.27	$	(0.03)	$	0.38	$	0.47
Diluted	$	0.26	$	(0.03)	$	0.37	$	0.15
Weighted average shares:
Basic	225,998,202		226,649,993		227,557,664		149,283,083
Diluted	231,868,397		226,649,993		234,084,800		152,432,945

See the accompanying notes which are an integral part of these condensed consolidated financial statements.

4

WillScot Mobile Mini Holdings Corp.

Condensed Consolidated Statements of Comprehensive Income (Loss)

(Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Net income (loss)	$	61,103	$	(6,051)	$	85,921	$	71,474
Other comprehensive income (loss):
Foreign currency translation adjustment, net of income tax expense of $0 and $60 for the three and nine months ended September 30, 2021, respectively, and $0 for the three and nine months ended September 30, 2020	(11,162)		14,619		(3,035)		1,457
Net gain (loss) on derivatives, net of income tax expense (benefit) of $676 and $(1,183) for the three months ended September 30, 2021 and 2020, respectively, and $1,999 and $(1,183) for the nine months ended September 30, 2021 and 2020, respectively	2,206		3,905		6,529		(3,878)
Total other comprehensive income (loss)	(8,956)		18,524		3,494		(2,421)
Comprehensive income	52,147		12,473		89,415		69,053
Comprehensive loss attributable to non-controlling interest	—		—		—		(672)
Total comprehensive income attributable to WillScot Mobile Mini	$	52,147	$	12,473	$	89,415	$	69,725

See the accompanying notes which are an integral part of these condensed consolidated financial statements.

5

WillScot Mobile Mini Holdings Corp.

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

Nine Months Ended September 30, 2021
	Common Stock			Additional Paid-in-Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Total Shareholders' Equity
(in thousands)	Shares	Amount
Balance at December 31, 2020	229,038	$	23	$	3,852,291	$	(37,207)	$	(1,751,234)	$	2,063,873
Net income	—	—		—		—		4,447		4,447
Other comprehensive income	—	—		—		7,211		—		7,211
Stock-based compensation and issuance of Common Stock from vesting	229	—		4,951		—		—		4,951
Repurchase and cancellation of Common Stock and warrants	(2,793)	—		(76,788)		—		—		(76,788)
Issuance of Common Stock from the exercise of options and warrants	341	—		5,414		—		—		5,414
Withholding taxes on net share settlement of stock-based compensation	—	—		(3,219)		—		—		(3,219)
Balance at March 31, 2021	226,815	$	23	$	3,782,649	$	(29,996)	$	(1,746,787)	$	2,005,889
Net income	—	—		—		—		20,371		20,371
Other comprehensive income	—	—		—		5,239		—		5,239
Stock-based compensation and issuance of Common Stock from vesting	60	—		9,038		—		—		9,038
Repurchase and cancellation of Common Stock and warrants	(4,100)	—		(35,508)		—		—		(35,508)
Issuance of Common Stock from the exercise of options and warrants	4,058	—		384		—		—		384
Balance at June 30, 2021	226,833	$	23	$	3,756,563	$	(24,757)	$	(1,726,416)	$	2,005,413
Net income	—	—		—		—		61,103		61,103
Other comprehensive income	—	—		—		(8,956)		—		(8,956)
Stock-based compensation and issuance of Common Stock from vesting	192	—		7,686		—		—		7,686
Repurchase and cancellation of Common Stock and warrants	(3,752)	—		(106,264)		—		—		(106,264)
Issuance of Common Stock from the exercise of options and warrants	393	—		1,517		—		—		1,517
Withholding taxes on net share settlement of stock-based compensation	—	—		(3,915)		—		—		(3,915)
Balance at September 30, 2021	223,666	$	23	$	3,655,587	$	(33,713)	$	(1,665,313)	$	1,956,584

See the accompanying notes which are an integral part of these condensed consolidated financial statements.

6

WillScot Mobile Mini Holdings Corp.

Condensed Consolidated Statements of Changes in Equity (continued)

(Unaudited)

Nine Months Ended September 30, 2020
	Class A Common Stock(1)			Class B Common Stock			Additional Paid-in-Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Total Shareholders' Equity		Non-Controlling Interest		Total Equity
(in thousands)	Shares	Amount		Shares	Amount
Balance at December 31, 2019	108,819	$	11	8,024	$	1	$	2,378,733	$	(62,775)	$	(1,825,361)	$	490,609	$	64,590	$	555,199
Net income (loss)	—	—		—	—		—		—		91,785		91,785		(130)		91,655
Other comprehensive loss	—	—		—	—		—		(27,199)		—		(27,199)		(2,703)		(29,902)
Stock-based compensation and issuance of Common Stock from vesting	239	—		—	—		1,787		—		—		1,787		—		1,787
Issuance of Common Stock from the exercise of warrants	1,497	—		—	—		28,958		—		—		28,958		—		28,958
Withholding taxes on net share settlement of stock-based compensation	—	—		—	—		(673)		—		—		(673)		—		(673)
Balance at March 31, 2020	110,555	$	11	8,024	$	1	$	2,408,805	$	(89,974)	$	(1,733,576)	$	585,267	$	61,757	$	647,024
Net (loss) income	—	—		—	—		—		—		(15,473)		(15,473)		1,343		(14,130)
Other comprehensive income	—	—		—	—		—		8,139		—		8,139		818		8,957
Reclassification of ModSpace Warrants	—	—		—	—		26,216		—		—		26,216		—		26,216
Stock-based compensation and issuance of Common Stock from vesting	—	—		—	—		2,227		—		—		2,227		—		2,227
Sapphire Exchange - see Note 10	10,641	1		(8,024)	(1)		66,890		(2,972)		—		63,918		(63,918)		—
Issuance of Common Stock from the exercise of warrants	37	—		—	—		374		—		—		374		—		374
Balance at June 30, 2020	121,233	$	12	—	$	—	$	2,504,512	$	(84,807)	$	(1,749,049)	$	670,668	$	—	$	670,668
Net loss	—	—		—	—		—		—		(6,051)		(6,051)		—		(6,051)
Other comprehensive income	—	—		—	—		—		18,524		—		18,524		—		18,524
Mobile Mini Merger	106,427	11		—	—		1,348,570		—		—		1,348,581		—		1,348,581
Stock-based compensation	321	—		—	—		6,058		—		—		6,058		—		6,058
Balance at September 30, 2020	227,981	$	23	—	$	—	$	3,859,140	$	(66,283)	$	(1,755,100)	$	2,037,780	$	—	$	2,037,780

(1) See Note 1 for information regarding the Company's conversion of Class A Common Stock to Common Stock on July 1, 2020 concurrent with the Merger.

See the accompanying notes which are an integral part of these condensed consolidated financial statements.

7

WillScot Mobile Mini Holdings Corp.

Condensed Consolidated Statements of Cash Flows (Unaudited)

	Nine Months Ended September 30,
(in thousands)	2021		2020
Operating activities:
Net income	$	85,921	$	71,474
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	235,536		171,425
Provision for credit losses	26,661		22,184
Impairment losses on right of use assets	—		57
Gain on sale of rental equipment and other property, plant and equipment	(25,327)		(8,756)
Amortization of debt discounts and debt issuance costs	10,554		9,547
Fair value loss (gain) on common stock warrant liabilities	26,597		(46,063)
Loss on extinguishment of debt	5,999		42,401
Stock-based compensation expense	21,674		6,958
Deferred income tax expense (benefit)	28,140		(67,324)
Unrealized currency losses, net	34		897
Changes in operating assets and liabilities:
Trade receivables	(93,592)		(15,274)
Inventories	(7,311)		1,440
Prepaid expenses and other assets	3,118		2,215
Operating lease assets and liabilities	59		584
Accrued interest	2,468		(7,657)
Accounts payable and other accrued expenses	45,868		(19,090)
Deferred revenue and customer deposits	25,656		10,077
Net cash provided by operating activities	392,055		175,095
Investing activities:
Acquisition of businesses, net of cash acquired	(56,244)		17,173
Proceeds from sale of rental equipment	42,034		25,281
Purchase of rental equipment and refurbishments	(178,191)		(122,273)
Proceeds from the sale of property, plant and equipment	16,647		5,825
Purchase of property, plant and equipment	(20,836)		(9,079)
Net cash used in investing activities	(196,590)		(83,073)
Financing activities:
Receipts from issuance of Common Stock from the exercise of options	7,315		7,694
Repurchase and cancellation of Common Stock and warrants	(320,562)		—
Payment of Common Stock issuance costs	—		(4,222)
Receipts from borrowings	551,063		2,735,793
Payment of financing costs	—		(64,552)
Repayment of borrowings	(423,591)		(2,715,042)
Payment of debt extinguishment premium costs	(3,705)		(34,610)
Principal payments on finance lease obligations	(12,321)		—
Taxes paid on employee stock awards	(7,134)		(673)
Net cash used in financing activities	(208,935)		(75,612)
Effect of exchange rate changes on cash and cash equivalents	(150)		542
Net change in cash and cash equivalents	(13,620)		16,952
Cash and cash equivalents at the beginning of the period	24,937		3,045
Cash and cash equivalents at the end of the period	$	11,317	$	19,997
Supplemental cash flow information:
Interest paid	$	66,437	$	80,558
Income taxes paid, net	$	6,124	$	1,276
Capital expenditures accrued or payable	$	35,819	$	24,179

See the accompanying notes which are an integral part of these condensed consolidated financial statements.

8

WillScot Mobile Mini Holdings Corp.

Notes to the Condensed Consolidated Financial Statements (Unaudited)

NOTE 1 - Summary of Significant Accounting Policies

Organization and Nature of Operations

WillScot Mobile Mini Holdings Corp. (“WillScot Mobile Mini” and, together with its subsidiaries, the “Company”) is a leading provider of modular space and portable storage solutions in the United States (“US”), Canada, Mexico and the United Kingdom ("UK"). The Company also maintains a fleet of specialty containment products, including liquid and solid containment solutions. The Company leases, sells, delivers and installs mobile solutions and storage products through an integrated network of branch locations that spans North America and the UK.

On July 1, 2020, WillScot Corporation, a Delaware corporation (“WillScot”), and Mobile Mini, Inc. (“Mobile Mini”) merged (the “Merger”). Immediately following the Merger, WillScot changed its name to “WillScot Mobile Mini Holdings Corp.” and filed an amended and restated certificate of incorporation (the "A&R Charter"), which reclassified all outstanding shares of WillScot Class A Common Stock and converted such shares into shares of Common Stock, par value $0.0001 per share, of WillScot Mobile Mini ("WillScot Mobile Mini Common Stock"). The WillScot Class A Common Stock was listed on the Nasdaq Capital Market (Nasdaq: WSC) up until the Merger, and the WillScot Mobile Mini Common Stock has been listed on the Nasdaq Capital Market (Nasdaq: WSC) since the Merger. As used herein, the term “Common Stock” or “the Company’s Common Stock” refers to WillScot Class A Common Stock prior to filing of the A&R Charter on July 1, 2020 and to WillScot Mobile Mini Common Stock as of and following the filing of the A&R Charter July 1, 2020.

The preparation of financial statements in accordance with US Generally Accepted Accounting Principles (“GAAP”) requires that our condensed consolidated financial statements and most of the disclosures in these notes be presented on a historical basis. Unless the context otherwise requires, the terms “Company” and “WillScot Mobile Mini” as used in these financial statements mean WillScot and its subsidiaries when referring to periods prior to July 1, 2020 (prior to the Merger) and to WillScot Mobile Mini, when referring to periods on or after July 1, 2020 (after the Merger).

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Quarterly Report on Form 10-Q and do not include all the information and notes required by GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements comprise the financial statements of WillScot Mobile Mini and its subsidiaries that it controls due to ownership of a majority voting interest and contain all adjustments, which are of a normal and recurring nature, necessary to present fairly the financial position, results of operations and cash flows for the interim periods presented.

Subsidiaries are fully consolidated from the date of acquisition, being the date on which the Company obtains control, and continue to be consolidated until the date when such control ceases. The financial statements of the subsidiaries are prepared for the same reporting period as the Company. All intercompany balances and transactions are eliminated.

The results of operations for the nine months ended September 30, 2021 are not necessarily indicative of the results to be expected for the full year. For further information, refer to the consolidated financial statements and notes included in the Company's Annual Report on Form 10-K/A for the year ended December 31, 2020.

Reclassifications

Certain reclassifications have been made to prior year financial statements to conform to the current year presentation.

Recently Issued and Adopted Accounting Standards

Recently Issued Accounting Standards

In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848), which is elective, and provides for optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The Company is currently evaluating the impact of reference rate reform and the potential impact of adoption of these elective practical expedients on its consolidated financial statements and does not expect the impact to be material.

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40). The new ASU eliminates the beneficial conversion and cash conversion accounting models for convertible instruments. It also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, the new guidance modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The amendments in the ASU are effective for public entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. The Company does not expect the adoption of this pronouncement to have a material impact on its consolidated financial statements.

9

Recently Adopted Accounting Standards

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which removes certain exceptions to the general principles for income taxes and also improves consistent application of accounting by clarifying or amending existing guidance. On January 1, 2021, the Company adopted ASU 2019-12 and the impact of adoption was not material to the Company's consolidated financial statements. The Company applied the standard prospectively for intraperiod tax allocation, year-to-date losses that exceed anticipated annual losses and enacted changes in tax laws.

NOTE 2 - Acquisitions

Mobile Mini Merger

Purchase Price

Upon completion of the Merger on July 1, 2020, each issued and outstanding share of Mobile Mini Common Stock, par value $0.01 per share, converted to 2.405 shares of WillScot Class A Common Stock, par value $0.0001 per share, and cash in lieu of any fractional shares. The Company issued 106,426,721 shares of Class A Common Stock to Mobile Mini stockholders as consideration for the Merger. The trading price of the Class A Common Stock was $12.53 per share on the closing date. In addition, Mobile Mini stock options converted into WillScot Mobile Mini stock options. The purchase price was determined as follows:

(in thousands, except share and per share data)	July 1, 2020
Mobile Mini Common Stock outstanding	44,252,275
Share conversion ratio	2.405
Common Stock issued	106,426,721
Common Stock per share price as of July 1, 2020	$	12.53
Fair value of shares of WillScot Class A Common Stock issued	$	1,333,527
Cash paid for fractional shares	30
Fair value of Mobile Mini Options converted to WillScot Mobile Mini Options	19,279
Total purchase price	$	1,352,836

The Merger was accounted for using the acquisition method of accounting, and WillScot was considered the accounting acquirer. Under the acquisition method of accounting, the Company assigned the purchase price to tangible and identifiable intangible assets acquired and liabilities assumed based on their fair values at the closing date. The excess of the purchase price over those fair values was recorded as goodwill.

The Company recorded the fair values based on independent valuations, discounted cash flow analyses, quoted market prices, contributory asset charges, and estimates made by management. The following table summarizes the July 1, 2020 fair values of the assets acquired and liabilities assumed.

10

Opening Balance Sheet

(in thousands)	July 1, 2020
Cash and cash equivalents	$	17,203
Trade receivables	87,492
Inventories	8,987
Prepaid expenses and other current assets	13,717
Rental equipment	1,032,672
Property, plant and equipment	160,729
Operating lease assets	92,054
Intangible assets	374,500
Goodwill identified	937,135
Other non-current assets	2,520
Total identifiable assets acquired	2,727,009
Accounts payable	(29,797)
Accrued expenses	(40,335)
Deferred revenue and customer deposits	(38,846)
Operating lease liabilities	(89,968)
Debt and finance lease liabilities	(897,244)
Deferred tax liabilities	(276,555)
Other long-term liabilities	(1,428)
Total liabilities assumed	(1,374,173)
Purchase Price	$	1,352,836

Mobile Mini generated $522.3 million of revenue and $94.3 million of pre-tax income in the nine months ended September 30, 2021, which is included in the condensed consolidated statements of operations.

The pro forma results presented below give effect to the following as if they occurred on January 1, 2019:

(i)	The Merger;
(ii)	Borrowings under the Company's 2025 Secured Notes and 2020 ABL Facility (both as defined in Note 9) used to repay certain debt in connection with the Merger;
(iii)	Extinguishment of the Mobile Mini revolving credit facility and senior notes assumed in the Merger and immediately repaid;
(iv)	Extinguishment of WillScot's 2017 ABL Facility and WillScot's 2022 Secured Notes (both as defined in Note 9) repaid in connection with the Merger;
(v)	Transaction costs incurred in connection with the Merger; and
(vi)	Elimination of WillScot's non-controlling interest and WillScot's Class B common stock in connection with the Merger. See Note 10 for further details.

The pro forma information is not necessarily indicative of the Company’s results of operations had the Merger been completed on January 1, 2019, nor is it necessarily indicative of the Company’s future results. The pro forma information does not reflect any cost savings from operating efficiencies, synergies, or revenue opportunities that could result from the Merger.

The Company's results of operations for the three and nine months ended September 30, 2021 and the three months ended September 30, 2020 represent the activities of the Company after the Merger. As a result, there were no differences between pro forma results and actual results on a reported basis.

11

The tables below present unaudited pro forma condensed combined statement of operations information for the nine months ended September 30, 2020:

(in thousands)	Nine Months Ended September 30, 2020
WillScot revenues	$	929,998
Mobile Mini revenues	284,240
Pro forma revenues	$	1,214,238
WillScot Mobile Mini income before income tax	$	5,304	(a)
Mobile Mini income before income tax	37,875
Pro forma income before income tax	43,179
Pro forma adjustments to combined income before income tax:
Elimination of Merger transaction costs	80,040		(b)
Impact of fair value mark-ups on rental fleet depreciation	(2,334)		(c)
Other depreciation expense and intangible asset amortization	(11,397)		(d)
Interest expense	(6,113)		(e)
Elimination of Mobile Mini interest expense	15,921		(f)
Elimination of loss on extinguishment of debt	19,682		(g)
Pro forma income before income tax	138,978
Income tax expense	22,300		(h)
Pro forma net income	$	116,678

(a)	Excludes impact of non-controlling interest which was eliminated as part of the Sapphire Exchange. See Note 10.
(b)	Eliminates discrete transaction costs incurred as a result of the Mobile Mini Merger.
(c)	Depreciation on rental equipment and property, plant and equipment were adjusted for the determination of the fair value of equipment acquired in the Mobile Mini Merger.
(d)	Represents the differential in other depreciation and amortization expense related to the fair value purchase accounting adjustments as a result of the Merger, principally the amortization of the Mobile Mini customer relationship valued at $209.0 million.
(e)	In connection with the Merger, the Company entered into a new ABL Facility and drew $1.47 billion at close with an estimated interest rate of 2.046%, issued the 2025 Secured Notes at 6.125%, repaid the 2022 Secured Notes and repaid the 2017 ABL Facility. Interest and amortization of deferred financing fees for the 2020 ABL Facility and the 2025 Secured Notes has been included offset by the removal of interest and amortization of deferred financing fees attributable to the 2022 Secured Notes and the 2017 ABL Facility. See Note 9 for definitions of terms.
(f)	Interest and amortization of deferred financing fees on the senior notes and line of credit maintained by Mobile Mini which were assumed at acquisition and repaid immediately using proceeds from the 2020 ABL Facility and 2025 Secured Notes was eliminated.
(g)	Elimination of loss on extinguishment of debt in connection with the redemption premium on the 2022 Secured Notes and unamortized deferred financing costs on the 2022 Secured Notes and 2017 ABL Facility. See Note 9 for definitions of terms.
(h)	Reflects the recorded income tax provision plus the adjustment to recognize the income tax impacts of the unaudited pro forma adjustments for which a tax expense is recognized using a US federal and state statutory tax rate of 25.5%. This rate may vary from the effective tax rates of the historical and combined businesses. In addition, the three and nine months ended September 30, 2020 included adjustments of $54.1 million and $56.8 million, respectively, to eliminate the reversal of valuation allowance as a result of reassessment of the realizability of deferred tax assets as a result of the Merger.

Other Acquisitions

On September 17, 2021, the Company acquired certain assets and liabilities of Equipe Container Services, Inc., Saf-T-Box, LP and American Mobile Leasing, LLC, which consisted primarily of approximately 11,000 storage units and 400 modular units, for $56.3 million in cash. Based on a preliminary allocation, the accompanying financial statements include approximately $53.0 million and $3.0 million of rental equipment and land, respectively, as a result of these acquisitions.

The amount of revenue and earnings the acquirees included in the consolidated statements of operations for the three and nine-months ended September 30, 2021 is not material to the financial statements. The pre-acquisition revenue and earnings for the acquirees as a percentage of the Company's 2020 Pro Forma results disclosed above and as a percentage of the Company's actual results for the year ended December 31, 2020 were not significant.

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Transaction and Integration Costs

The Company recorded $0.3 million and $52.2 million in transaction costs related to the Merger and other acquisitions during the three months ended September 30, 2021 and 2020, respectively, and $1.1 million and $63.2 million in transaction costs related to the Merger and other acquisitions in the nine months ended September 30, 2021 and 2020, respectively. The Company also recorded $8.2 million and $7.1 million in integration costs related to the Merger within selling, general and administrative ("SG&A") expense during the three months ended September 30, 2021 and 2020, respectively, and $23.2 million and $9.4 million during the nine months ended September 30, 2021 and 2020, respectively.

NOTE 3 - Revenue

Revenue Disaggregation

Geographic Areas

The Company had total revenue in the following geographic areas for the three and nine months ended September 30, 2020 as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
US	$	427,251	$	368,285	$	1,197,800	$	841,227
Canada	31,536		24,098		84,663		57,083
Mexico	3,666		3,279		10,977		10,035
UK	28,099		21,653		83,537		21,653
Total revenues	$	490,552	$	417,315	$	1,376,977	$	929,998

Major Product and Service Lines

Equipment leasing is the Company's core business. This includes rental modular space, portable space and tank and pump units along with value added products and services ("VAPS"), which include furniture, steps, ramps, basic appliances, internet connectivity devices, and other items used by customers in connection with the Company's products. Leasing is complemented by new unit sales and sales of rental units. In connection with its leasing and sales activities, the Company provides services including delivery and installation, maintenance and ad hoc services and removal services at the end of lease transactions.

The Company’s revenue by major product and service line for the three and nine months ended September 30, 2021 was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Modular space leasing revenue	$	188,507	$	163,635	$	539,835	$	427,409
Portable storage leasing revenue	66,184		52,941		179,645		64,506
Tank and pump leasing revenue	19,040		14,112		51,909		14,112
VAPS and third party leasing revenues(a)	73,517		56,330		206,823		139,754
Other leasing-related revenue(b)	16,148		13,064		44,025		32,796
Leasing revenue	363,396		300,082		1,022,237		678,577
Delivery and installation revenue	99,699		84,694		274,883		187,404
Total leasing and services revenue	463,095		384,776		1,297,120		865,981
New unit sales revenue	15,860		19,360		37,823		38,736
Rental unit sales revenue	11,597		13,179		42,034		25,281
Total revenues	$	490,552	$	417,315	$	1,376,977	$	929,998

(a)	Includes $7.2 million and $5.6 million of service revenue for the three months ended September 30, 2021 and 2020, respectively, and $21.2 million and $13.9 million of service revenue for the nine months ended September 30, 2021 and 2020, respectively.
(b)	Includes primarily damage billings, delinquent payment charges, and other processing fees.

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Leasing and Services Revenue

The majority of revenue (73% for the three and nine months ended September 30, 2021 and 71% for the three and nine months ended September 30, 2020) is generated by rental income subject to the guidance of ASU 2018-11, Leases (Topic 842) ("ASC 842"). The remaining revenue for the three and nine months ended September 30, 2021 and 2020 is generated by performance obligations in contracts with customers for services or sale of units subject to the guidance in ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASC 606").

Receivables, Contract Assets and Liabilities

As reflected above, approximately 73% of the Company's rental revenue is generated by lease revenue subject to the guidance in ASC 842. The customers that are responsible for the remaining revenue accounted for under ASC 606 are generally the same customers that rent the Company's equipment. The Company manages credit risk associated with its accounts receivables at the customer level. As the same customers generate the revenues that are accounted for under both ASC 606 and ASC 842, the discussions below on credit risk and the Company's allowance for credit losses address its total revenues. The Company's top five customers with the largest open receivables balances represented 4.7% of the total receivables balance as of September 30, 2021.

As of September 30, 2021 and December 31, 2020, the Company had approximately $78.8 million and $74.1 million, respectively, of deferred revenue that relates to removal services for lease transactions and advance billings for sale transactions, which are within the scope of ASC 606 and are included in deferred revenue and customer deposits in the condensed consolidated balance sheets. During the three months ended September 30, 2021, $20.9 million of previously deferred revenue relating to removal services for lease transactions and advance billings for sale transactions was recognized as revenue.

The Company does not have material contract assets and it did not recognize any material impairments of contract assets.

The Company's uncompleted contracts with customers have unsatisfied (or partially satisfied) performance obligations. For the future services revenues that are expected to be recognized within twelve months, the Company has elected to utilize the optional disclosure exemption made available regarding transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations. The transaction price for performance obligations that will be completed in greater than twelve months is variable based on the costs ultimately incurred to provide those services.

The primary costs to obtain contracts for new and rental unit sales with the Company's customers are commissions paid to its sales force. The Company pays its sales force commissions on the sale of new and rental units. For new and rental unit sales, the period benefited by each commission is less than one year, therefore the commissions are expensed as incurred.

Credit Losses

The Company is exposed to credit losses from trade receivables generated through its leasing and sales business. The Company assesses each customer’s ability to pay for the products it leases or sells by conducting a credit review. The credit review considers expected billing exposure and timing for payment and the customer’s established credit rating. The Company performs its credit review of new customers at inception of the customer relationship and for existing customers when the customer transacts new leases after a defined period of dormancy. The Company also considers contract terms and conditions, country risk and business strategy in the evaluation.

The Company monitors ongoing credit exposure through an active review of customer balances against contract terms and due dates. The Company may employ collection agencies and legal counsel to pursue recovery of defaulted receivables. The allowances for credit losses reflect the estimate of the amount of receivables that the Company will be unable to collect based on historical write-off experience and, as applicable, current conditions and reasonable and supportable forecasts that affect collectability. This estimate could require change based on changing circumstances, including changes in the economy or in the particular circumstances of individual customers. Accordingly, the Company may be required to increase or decrease its allowances.

Activity in the allowance for credit losses was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Balance at beginning of period	$	36,785	$	19,183	$	29,258	$	15,828
Net charges to bad debt expense and revenue	9,751		13,062		26,661		22,184
Write-offs	(4,543)		(6,822)		(14,415)		(12,395)
Foreign currency translation and other	(126)		(1,237)		363		(1,431)
Balance at end of period	$	41,867	$	24,186	$	41,867	$	24,186

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NOTE 4 - Leases

As of September 30, 2021, the undiscounted future lease payments for operating and finance lease liabilities were as follows:

(in thousands)	Operating		Finance
2021 (remaining)	$	16,246	$	5,520
2022	60,038		20,012
2023	49,165		16,561
2024	40,555		13,639
2025	33,371		13,747
Thereafter	76,957		22,841
Total lease payments	276,332		92,320
Less: interest	(42,745)		(6,720)
Present value of lease liabilities	$	233,587	$	85,600

Finance lease liabilities are included within long-term debt and current portion of long-term debt on the condensed consolidated balance sheets.

The Company’s lease activity during the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Financial Statement Line	2021		2020
Finance Lease Expense
Amortization of finance lease assets	$	14,231	$	4,360
Interest on obligations under finance leases	1,674		512
Total finance lease expense	$	15,905	$	4,872
Operating Lease Expense
Fixed lease expense
Cost of leasing and services	$	3,019	$	4,444
Selling, general and administrative	44,732		29,682
Lease impairment expense and other related charges	1,571		2,103
Short-term lease expense
Cost of leasing and services	17,751		19,765
Selling, general and administrative	680		1,612
Lease impairment expense and other related charges	0		471
Variable lease expense
Cost of leasing and services	5,442		5,277
Selling, general and administrative	5,702		3,645
Lease impairment expense and other related charges	402		666
Total operating lease expense	$	79,299	$	67,665

Lease impairment expense and other related charges relate to closed locations that are no longer used in operations as a result of consolidation activities within the Company. During the nine months ended September 30, 2021, the Company recorded $2.3 million in lease impairment expense and other related charges which is comprised of $0.3 million loss on lease exit and impairment charges and $2.0 million in closed location rent expense. During the nine months ended September 30, 2020, the Company recorded $4.0 million in lease impairment expense and other related charges which is comprised of $0.7 million loss on lease exit and $3.3 million in closed location rent expense.

15

Supplemental cash flow information related to leases for the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Supplemental Cash Flow Information	2021		2020
Cash paid for the amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	48,403	$	35,065
Operating cash outflows from finance leases	$	1,669	$	491
Financing cash outflows from finance leases	$	12,388	$	3,434
Right of use assets obtained in exchange for lease obligations	$	43,448	$	26,727
Assets obtained in exchange for finance leases	$	19,947	$	6,322

Weighted-average remaining operating lease terms and the weighted average discount rates as of September 30, 2021 and December 31, 2020 were as follows:

Lease Terms and Discount Rates	September 30, 2021		December 31, 2020
Weighted-average remaining lease term - operating leases	6.0 years		6.4 years
Weighted-average discount rate - operating leases	5.3	%	5.7	%
Weighted-average remaining lease term - finance leases	4.5 years		4.6 years
Weighted-average discount rate - finance leases	2.9	%	2.9	%

The Company presents information related to leasing revenues in Note 3.

NOTE 5 - Inventories

Inventories at the respective balance sheet dates consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Raw materials	$	24,472	$	19,560
Finished units	6,471		4,171
Inventories	$	30,943	$	23,731

NOTE 6 - Rental Equipment, net

Rental equipment, net at the respective balance sheet dates consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Modular space units	$	2,901,998	$	2,796,284
Portable storage units	716,033		653,707
Tank and pump products	149,123		132,071
Value added products	158,336		143,652
Total rental equipment	3,925,490		3,725,714
Less: accumulated depreciation	(956,595)		(794,068)
Rental equipment, net	$	2,968,895	$	2,931,646

During the third quarter of 2021, certain of the Company’s rental equipment in Louisiana was adversely impacted by Hurricane Ida. The Company maintains insurance on its rental equipment, generally in the form of replacement cost policies. Such policies are subject to varying deductibles and other conditions. Based on management’s preliminary estimates of potential losses net of insurance recoveries, the impact to our financial statements in Q3 is immaterial.

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NOTE 7 - Goodwill

Changes in the carrying amount of goodwill were as follows:

(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Total
Balance at December 31, 2019	$	235,177	$	—	$	—	$	—	$	235,177
Acquisition of Mobile Mini	—		726,529		59,183		143,262		928,974
Effects of movements in foreign exchange rates	651		—		6,417		—		7,068
Balance at December 31, 2020	235,828		726,529		65,600		143,262		1,171,219
Changes to Mobile Mini purchase accounting	285,000		(233,666)		—		(43,173)		8,161
Effects of movements in foreign exchange rates	113		(311)		(910)		18		(1,090)
Balance at September 30, 2021	$	520,941	$	492,552	$	64,690	$	100,107	$	1,178,290

The Company had no goodwill impairment during the nine months ended September 30, 2021 or the year ended December 31, 2020. Changes to Mobile Mini purchase accounting are largely the result of the finalization of the assignment of goodwill to the reporting units during the measurement period.

NOTE 8 - Intangibles

Intangible assets other than goodwill at the respective balance sheet dates consisted of the following:

	September 30, 2021
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	—	$	3,000	$	(3,000)	$	—
Mobile Mini customer relationships	6.8	209,000		(31,898)		177,102
Technology	4.8	1,500		(313)		1,187
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	502,500	$	(35,211)	$	467,289

	December 31, 2020
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	0.7	$	3,000	$	(2,375)	$	625
Mobile Mini customer relationships	8.0	217,000		(12,053)		204,947
Technology	5.5	1,500		(125)		1,375
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	510,500	$	(14,553)	$	495,947

Amortization expense related to intangible assets was $6.8 million and $5.4 million for the three months ended September 30, 2021 and 2020, respectively, and $20.6 million and $5.9 million for the nine months ended September 30, 2021 and 2020, respectively.

As discussed in Note 2, the Company acquired Mobile Mini on July 1, 2020. The Company recorded $164.0 million to indefinite-lived intangible assets related to the Mobile Mini trade name and $210.5 million of intangibles subject to amortization related to Mobile Mini customer relationships and technology.

17

Based on the carrying value at September 30, 2021, future amortization of intangible assets is expected to be as follows for the years ended December 31:

(in thousands)
2021 (remaining)	$	6,604
2022	26,416
2023	26,416
2024	26,416
2025	26,416
Thereafter	66,021
Total	$	178,289

NOTE 9 - Debt

The carrying value of debt outstanding at the respective balance sheet dates consisted of the following:

(in thousands, except rates)	Interest rate	Year of maturity	September 30, 2021		December 31, 2020
2025 Secured Notes	6.125%	2025	$	517,581	$	637,068
ABL Facility(a)	Varies	2025	1,521,518		1,263,833
2028 Secured Notes	4.625%	2028	492,253		491,555
Finance Leases	Varies	Varies	85,600		77,874
Total debt			2,616,952		2,470,330
Less: current portion of long-term debt			18,652		16,521
Total long-term debt			$	2,598,300	$	2,453,809

(a) As of both September 30, 2021 and December 31, 2020, the Company had no outstanding principal borrowings on the Multicurrency Facility and $6.6 million and $7.9 million, respectively, of related debt issuance costs. No related debt issuance costs were recorded as a direct offset against the principal borrowings on the Multicurrency Facility, and the $6.6 million and $7.9 million in excess of principal was included in other non-current assets on the condensed consolidated balance sheets.

Asset Backed Lending Facilities ("ABL Facility")

On November 29, 2017, Williams Scotsman Holdings Corp ("Holdings"), Williams Scotsman International, Inc. ("WSII") and certain of its subsidiaries entered into an ABL credit agreement (the “2017 ABL Facility”), as amended, that provided a senior secured revolving credit facility that matured on May 29, 2022. The 2017 ABL Facility consisted of (i) a $1.3 billion asset-backed revolving credit facility for WSII and certain of its domestic subsidiaries (the "2017 US ABL Facility"), (ii) a $140.0 million asset-based revolving credit facility (the "2017 Canadian ABL Facility") for certain Canadian subsidiaries of WSII, and (iii) an accordion feature that permitted the borrowers to increase the lenders’ commitments in an aggregate amount not to exceed $375.0 million, subject to the satisfaction of customary conditions and lender approval, plus any voluntary prepayments that are accompanied by permanent commitment reductions under the 2017 ABL Facility.

On July 1, 2020, in connection with the completion of the Merger, Holdings, WSII, and certain of its subsidiaries, entered into a new asset-based credit agreement, that provides for revolving credit facilities in the aggregate principal amount of up to $2.4 billion, consisting of: (i) a senior secured asset-based US dollar revolving credit facility in the aggregate principal amount of $2.0 billion (the “US Facility”), available to WSII and certain of its subsidiaries (collectively, the “US Borrowers”), and (ii) a $400.0 million senior secured asset-based multicurrency revolving credit facility (the "Multicurrency Facility" together with the US Facility, the “2020 ABL Facility”), available to be drawn in US Dollars, Canadian Dollars, British Pounds Sterling or Euros by the US Borrowers, and certain of WSII’s wholly-owned subsidiaries organized in Canada and in the UK. On July 1, 2020, in connection with the completion of the Merger, approximately $1.5 billion of proceeds from the 2020 ABL Facility were used to repay the 2017 ABL Facility and the asset-backed lending facility assumed in the transaction with Mobile Mini, as well as to pay fees and expenses related to the Merger and the debt financing transactions. In connection with the repayment of the 2017 ABL facility, the Company wrote off $4.4 million of deferred financing costs to loss on extinguishment of debt in the third quarter of 2020. The 2020 ABL Facility matures July 1, 2025.

18

Borrowings under the 2020 ABL Facility initially bear interest at (i) in the case of US Dollars, at WSII’s option, either an adjusted LIBOR rate plus 1.875% or an alternative base rate plus 0.875%, (ii) in the case of Canadian Dollars, at WSII’s option, either a Canadian BA rate plus 1.875% or Canadian prime rate plus 0.875%, and (iii) in the case of Euros and British Pounds Sterling, an adjusted LIBOR rate plus 1.875%. The 2020 ABL Facility requires the payment of an annual commitment fee on the unused available borrowings of 0.225% per annum. At September 30, 2021, the weighted average interest rate for borrowings under the 2020 ABL Facility was 1.97%. The weighted average interest rate on the balance outstanding as of September 30, 2021, as adjusted for the effects of the interest rate swap agreements, was 2.73%. Refer to Note 16 for a more detailed discussion on interest rate management.

Borrowing availability under the US Facility and the Multicurrency Facility is equal to the lesser of (i) the aggregate Revolver Commitments and (ii) the Line Cap. At September 30, 2021, the Line Cap was $2.4 billion and the Borrowers had $831.6 million of available borrowing capacity under the 2020 ABL Facility, including $431.6 million under the US Facility and $400.0 million under the Multicurrency Facility. At September 30, 2021, borrowing capacity under the 2020 ABL Facility allowed for up to $207.1 million of letters of credit and up to $170.0 million of swingline loans. At September 30, 2021, letters of credit and bank guarantees carried fees of 2.00%. The Company had issued $12.9 million of standby letters of credit under the 2020 ABL Facility at September 30, 2021.

The Company had $1.6 billion outstanding principal under the 2020 ABL Facility at September 30, 2021. Debt issuance costs of $34.0 million were included in the carrying value of the 2020 ABL Facility at September 30, 2021.

2022 Senior Secured Notes

WSII had $270.0 million aggregate principal amount of 7.875% senior secured notes due December 15, 2022 (the “2022 Secured Notes”). In connection with the Merger and related financing transactions in the third quarter of 2020, using proceeds from the 2025 Secured Notes discussed below, the Company redeemed all of its 2022 Secured Notes.

2023 Senior Secured Notes

WSII had $490.0 million of 6.875% senior secured notes due August 15, 2023 (the “2023 Secured Notes”). On August 11, 2020, WSII redeemed 10% of the outstanding principal amount of the 2023 Secured Notes, $49.0 million. On August 25, 2020, the Company completed a private offering of its 2028 Secured Notes, discussed below, and used the offering proceeds to repay, along with expenses, the $441.0 million outstanding principal amount of its 2023 Secured Notes.

2025 Senior Secured Notes

In anticipation of the Merger, on June 15, 2020, Picasso Finance Sub, Inc., a newly-formed indirect finance subsidiary (the “Finance Sub”) of the Company, completed a private offering of $650.0 million in aggregate principal amount of its 6.125% senior secured notes due 2025 (the “2025 Secured Notes”). Finance Sub was merged into WSII on July 1, 2020. The offering proceeds were used to repay the 2022 Secured Notes, repay Mobile Mini senior notes assumed in the acquisition and pay certain fees and expenses related to the Merger and the related financing transactions.

On March 26, 2021, using cash on hand and borrowings on the 2020 ABL Facility, the Company redeemed 10% of the outstanding principal, or $65.0 million, of its 2025 Secured Notes and recorded a loss on extinguishment of debt in the condensed consolidated statement of operations of $3.2 million comprised of a redemption premium of $1.9 million and write- off of unamortized deferred financing fees of $1.3 million in the first quarter of 2021.

On June 16, 2021, using cash on hand and borrowings on the 2020 ABL Facility, the Company redeemed 10% of the outstanding principal, or $58.5 million, of its 2025 Secured Notes and recorded a loss on extinguishment of debt in the condensed consolidated statement of operations of $2.8 million comprised of a redemption premium of $1.8 million and write-off of unamortized deferred financing fees of $1.0 million in the second quarter of 2021.

The 2025 Secured Notes mature on June 15, 2025 and bear interest at a rate of 6.125% per annum. Interest is payable semi-annually on June 15 and December 15 of each year, beginning December 15, 2020. Unamortized deferred financing costs pertaining to the 2025 Secured Notes were $8.9 million as of September 30, 2021.

2028 Senior Secured Notes

On August 25, 2020, the Company, completed a private offering of $500.0 million in aggregate principal amount of 4.625% senior secured notes due 2028 (the “2028 Secured Notes”). The 2028 Secured Notes mature on August 15, 2028. They bear interest at a rate of 4.625% per annum. Interest is payable semi-annually on August 15 and February 15 of each year, beginning February 15, 2021. Unamortized deferred financing cost pertaining to the 2028 Secured Notes were $7.7 million as of September 30, 2021.

Finance Leases

The Company maintains finance leases primarily related to transportation equipment. At September 30, 2021 and December 31, 2020, obligations under finance leases for certain real property and transportation related equipment were $85.6 million and $77.9 million, respectively. Refer to Note 4 for further information.

The Company is in compliance with all debt covenants and restrictions for the aforementioned debt instruments as of September 30, 2021 and December 31, 2020.

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NOTE 10 – Equity

Common Stock

On June 30, 2020, as contemplated by the merger agreement, Sapphire Holding S.à r.l. ("Sapphire Holdings"), an affiliate of TDR Capital LLP (“TDR Capital”), exchanged each of its shares of common stock of Holdings for 1.3261 shares of newly issued WillScot Class A Common Stock (the "Sapphire Exchange"). As a result of the Sapphire Exchange, all issued and outstanding shares of WillScot’s Class B Common Stock, par value $0.0001 per share (the "Class B Common Stock"), were automatically canceled for no consideration and the existing exchange agreement was automatically terminated. As a result of the Sapphire Exchange, Holdings became a wholly-owned subsidiary of WillScot. Sapphire Holdings received 10,641,182 shares of Common Stock of WillScot in the Sapphire Exchange. Prior to the Sapphire Exchange, Sapphire Holdings' ownership of Holdings was recorded as a non-controlling interest in the consolidated financial statements. Subsequent to the Sapphire Exchange, the Company's subsidiaries are each wholly owned and there is no non-controlling interest. As a result of the Sapphire Exchange, non-controlling interest of $63.9 million was reclassified to $66.9 million of additional paid-in-capital and $3.0 million to accumulated other comprehensive loss, on the condensed consolidated balance sheet.

In connection with the Merger on July 1, 2020, the Company issued 106,426,722 shares of Class A Common Stock in exchange for Mobile Mini Common Stock outstanding and subsequently filed an amended and restated certificate of incorporation, which reclassified all outstanding shares of the Class A Common Stock and converted such shares into shares of Common Stock, par value $0.0001 per share, of WillScot Mobile Mini.

In connection with the stock compensation vesting events and stock option exercises described in Note 15, and the warrant exercises described below, the Company issued 5,273,466 shares of Common Stock during the nine months ended September 30, 2021.

Stock Repurchase Program

On August 7, 2020, the Company's Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $250 million of its outstanding shares of Common Stock. On April 29, 2021, the Board of Directors approved an increase in repurchase authority to $500 million. The stock repurchase program does not obligate the Company to purchase any particular number of shares, and the timing and exact amount of any repurchases will depend on various factors, including market pricing and conditions, business, legal, accounting, and other considerations.

The Company may repurchase its shares in open market transactions from time to time or through privately negotiated transactions in accordance with federal securities laws, at the Company's discretion. The repurchase program, which has no expiration date, may be increased, suspended, or terminated at any time. The program is expected to be implemented over the course of several years and is conducted subject to the covenants in the agreements governing the Company's indebtedness.

During the nine months ended September 30, 2021, the Company repurchased 11,656,552 shares of Common Stock and stock equivalents for $322.6 million. As of September 30, 2021, $142.2 million of the approved repurchase pool remained available. In October of 2021, the Company's Board of Directors replaced the existing share repurchase program with a new share repurchase program that authorizes the Company to repurchase up to $1.0 billion of its outstanding shares of Common Stock and equivalents.

Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive income (loss) ("AOCI"), net of tax, for the nine months ended September 30, 2021 and 2020 were as follows:

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2020	$	(24,694)	$	(12,513)	$	(37,207)
Other comprehensive income (loss) before reclassifications	5,034		(760)		4,274
Reclassifications from AOCI to income	—		2,937		2,937
Balance at March 31, 2021	(19,660)		(10,336)		(29,996)
Other comprehensive income (loss) before reclassifications	3,093		(848)		2,245
Reclassifications from AOCI to income	—		2,994		2,994
Balance at June 30, 2021	(16,567)		(8,190)		(24,757)
Other comprehensive loss before reclassifications	(11,162)		(830)		(11,992)
Reclassifications from AOCI to income	—		3,036		3,036
Balance at September 30, 2021	$	(27,729)	$	(5,984)	$	(33,713)

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(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2019	$	(52,982)	$	(9,793)	$	(62,775)
Other comprehensive loss before reclassifications	(21,144)		(10,330)		(31,474)
Reclassifications from AOCI to income	—		1,572		1,572
Less other comprehensive loss attributable to non-controlling interest	1,913		790		2,703
Balance at March 31, 2020	(72,213)		(17,761)		(89,974)
Other comprehensive income (loss) before reclassifications	7,982		(1,642)		6,340
Reclassifications from AOCI to income	—		2,617		2,617
Less other comprehensive income attributable to non-controlling interest	(730)		(88)		(818)
Impact of elimination of non-controlling interest on accumulated other comprehensive income	(1,299)		(1,673)		(2,972)
Balance at June 30, 2020	(66,260)		(18,547)		(84,807)
Other comprehensive income prior to reclassifications	14,619		947		15,566
Reclassifications from AOCI to income	—		2,958		2,958
Balance at September 30, 2020	$	(51,641)	$	(14,642)	$	(66,283)

For the nine months ended September 30, 2021 and 2020, $9.0 million and $7.1 million, respectively, was reclassified from AOCI into the condensed consolidated statements of operations within interest expense related to the interest rate swaps discussed in Note 16. The Company recorded a tax expense of $0.7 million and $2.0 million for the three and nine months ended September 30, 2021, respectively, and an income tax benefit of $1.2 million for the three and nine months ended September 30, 2020 associated with this reclassification.

NOTE 11 – Warrants

Warrants

2015 Public Warrants

WillScot was incorporated under the name Double Eagle Acquisition Corporation ("DEAC") on June 26, 2015. On November 29, 2017, DEAC acquired WSII from Algeco Scotsman Global S.à.r.l., which is majority owned by an investment fund managed by TDR Capital, and DEAC domesticated to Delaware and changed its name to WillScot Corporation.

As part of its initial public offering, DEAC issued warrants (the “2015 Public Warrants”). Each 2015 Public Warrant entitled the holder to purchase one-half of one share of Common Stock at a price of $5.75 per half share (or $11.50 per whole share), subject to adjustment. On January 24, 2020, the Company delivered a notice (the "Redemption Notice") to redeem all of its 2015 Public Warrants that remained unexercised on February 24, 2020. As further described in the Redemption Notice and permitted under the Warrant Agreement, holders of these warrants who exercised them following the date of the Redemption Notice were required to do so on a cashless basis. From January 1, 2020 through January 24, 2020, 796,610 warrants were exercised for cash, resulting in the Company receiving cash proceeds of $4.6 million and the Company issuing 398,305 shares of the Company's Class A Common Stock. After January 24, 2020 through February 24, 2020, 5,836,048 warrants were exercised on a cashless basis. An aggregate of 1,097,162 shares of the Company's Class A Common Stock was issued in connection with these exercises. On February 24, 2020, the Company completed the redemption of 38,509 remaining warrants under the Redemption Notice for $0.01 per warrant. No Public Warrants remain outstanding.

2015 Private Warrants

DEAC also issued warrants to purchase its Common Stock in a private placement concurrently with its initial public offering (the “2015 Private Warrants”). Each 2015 Private Warrant entitled the holder to purchase one-half of one share of Common Stock at a price of $5.75 per half share (or $11.50 per whole share), subject to adjustment. Additionally, if held by certain original investors (or their permitted assignees), the 2015 Private Warrants could be exercised on a cashless basis and are not subject to redemption. During the six months ended June 30, 2021, 3,055,000 2015 Private Warrants were repurchased for $25.5 million and cancelled. In addition, during the six months ended June 30, 2021, 9,655,000 warrants were exercised on a cashless basis, resulting in the issuance of 2,939,898 shares of Common Stock. As a result of these transactions, no 2015 private warrants remain outstanding.

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2018 Warrants

In connection with the Modular Space Holdings ("ModSpace") acquisition in 2018, WillScot issued warrants to purchase approximately 10.0 million shares of Common Stock (the "2018 Warrants") to former shareholders of ModSpace. Each 2018 Warrant entitles the holder thereof to purchase one share of Common Stock at an exercise price of $15.50 per share, subject to potential adjustment. The 2018 Warrants expire on November 29, 2022. During the nine months ended September 30, 2021, 223,310 of these 2018 Warrants were repurchased for $2.3 million and cancelled. In addition, during the nine months ended September 30, 2021, 2,981,195 2018 Warrants were exercised on a cashless basis, resulting in the issuance of 1,372,548 shares of common stock. At September 30, 2021, 6,525,736 2018 Warrants were outstanding.

The Company accounted for its warrants in the following ways: (i) the 2015 Public Warrants as liabilities through their final redemption in February 2020, (ii) the 2015 Private Warrants as liabilities through their final repurchase or exercise in May 2021, and (iii) the 2018 Warrants as liabilities until June 30, 2020, the date all issued and outstanding shares of the Company's Class B Common Stock were cancelled. Subsequent to June 30, 2020, the 2018 Warrants were equity classified.

The Company determined the following fair values for the outstanding common stock warrants recorded as liabilities:

(in thousands)	September 30, 2021	December 31, 2020
2015 Private Warrants	N/A	$	77,404

NOTE 12 – Income Taxes

The Company recorded $6.6 million and $36.0 million of income tax expense for the three and nine months ended September 30, 2021, respectively, and $66.7 million and $66.2 million of income tax benefit for the three and nine months ended September 30, 2020, respectively. The Company’s effective tax rate for the three and nine months ended September 30, 2021 was 9.8% and 29.5%, respectively. The Company's effective tax rate for the three and nine months ended September 30, 2020 was 91.7% and (1,247.5)%, respectively.

The effective tax rate for the three months ended September 30, 2021 differs from the US federal statutory rate of 21% primarily due to the reversal of approximately $12.8 million in reserves for uncertain tax positions (“UTP”) due to the expiration of relevant statutes of limitation. The effective tax rate for the nine months ended September 30, 2021 differs from the US federal statutory rate of 21% primarily due to the permanent add-backs related to fair value accounting on the Company’s warrants and executive compensation with an offset related to the discrete tax benefit from the reversal of reserves for UTP.

The effective tax rate for the three months ended September 30, 2020 is different from the US statutory rate of 21% primarily as a result of a pre-tax loss approximately equal to the discrete tax benefit from the reversal of the Company’s valuation allowance on net operating losses prior to the merger with Mobile Mini and the reversal of reserves for UTP due to the expiration of statutes of limitations. The effective tax rate for the nine months ended September 30, 2020 is different from the US statutory rate of 21% primarily as a result of discrete benefits from the reversal of valuation allowances and reserves for UTP.

NOTE 13 - Fair Value Measures

The fair value of financial assets and liabilities are included at the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale.

The Company utilizes the suggested accounting guidance for the three levels of inputs that may be used to measure fair value:

Level 1 -	Observable inputs such as quoted prices in active markets for identical assets or liabilities;
Level 2 -	Observable inputs, other than Level 1 inputs in active markets, that are observable either directly or indirectly; and
Level 3 -	Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions

The Company has assessed that the fair value of cash and cash equivalents, trade receivables, trade payables, and other current liabilities approximate their carrying amounts. Based on the borrowing rates currently available for bank loans with similar terms and average maturities, the fair value of finance leases at September 30, 2021 approximate their respective book values.

Prior to their redemption, the Company’s 2015 Public Warrants traded in active markets. When classified as liabilities, warrants traded in active markets with sufficient trading volume represent Level 1 financial instruments as they are publicly traded in active markets and thus have observable market prices which are used to estimate the fair value adjustments for the related common stock warrant liabilities. When classified as liabilities, warrants not traded in active markets, or traded with insufficient volume, represent Level 3 financial instruments that are valued using a Black-Scholes option-pricing model to estimate the fair value adjustments for the related common stock warrant liabilities.

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The following table shows the carrying amounts and fair values of financial liabilities which are disclosed, but not measured, at fair value, including their levels in the fair value hierarchy:

	September 30, 2021								December 31, 2020
	Carrying Amount		Fair Value						Carrying Amount		Fair Value
(in thousands)			Level 1		Level 2		Level 3				Level 1		Level 2		Level 3
ABL Facilities	$	1,521,518	$	—	$	1,555,500	$	—	$	1,263,833	$	—	$	1,304,612	$	—
2025 Secured Notes	517,581		—		556,374		—		637,068		—		694,876		—
2028 Secured Notes	492,253		—		521,435		—		491,555		—		518,820		—
Total	$	2,531,352	$	—	$	2,633,309	$	—	$	2,392,456	$	—	$	2,518,308	$	—

As of September 30, 2021, the carrying values of the ABL Facilities, the 2025 Secured Notes, and the 2028 Secured Notes include $34.0 million, $8.9 million, and $7.7 million, respectively, of unamortized debt issuance costs, which are presented as a direct reduction of the corresponding liability. As of December 31, 2020, the carrying value of the ABL Facilities, the 2025 Secured Notes, and the 2028 Secured Notes includes $40.8 million, $12.9 million, and $8.4 million, respectively, of unamortized debt issuance costs, which are presented as a direct reduction of the corresponding liability.

The carrying value of the ABL Facilities, excluding debt issuance costs, approximates fair value as the interest rates are variable and reflective of current market rates. The fair value of the 2025 Secured Notes and the 2028 Secured Notes is based on their last trading price at the end of each period obtained from a third party. The classification and the fair value of derivative assets and liabilities designated as hedges in the condensed consolidated balance sheets are disclosed in Note 16.

The following table shows the carrying amounts and fair values of financial liabilities which are measured at fair value:

	September 30, 2021								December 31, 2020
	Carrying Amount		Fair Value						Carrying Amount		Fair Value
(in thousands)			Level 1		Level 2		Level 3				Level 1		Level 2		Level 3
2015 Private warrants	N/A		N/A		N/A		N/A		$	77,404	$	—	$	—	$	77,404
Total	$	—	$	—	$	—	$	—	$	77,404	$	—	$	—	$	77,404

Level 3 Disclosures

When the 2015 Private Warrants and 2018 Warrants were classified as liabilities, the Company utilized a Black Scholes option-pricing model to value the warrants at each reporting period and transaction date, with changes in fair value recognized in the statements of operations. The estimated fair value of the common stock warrant liability was determined using Level 3 inputs. Inherent in the pricing model were assumptions related to expected share-price volatility, expected life, risk-free interest rate and dividend yield. The Company estimated the volatility of its ordinary shares based on historical volatility that matched the expected remaining life of the warrants. The risk-free interest rate was based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected remaining life of the warrants. The expected life of the warrants was assumed to be equivalent to their remaining contractual term. The dividend rate was based on the historical rate, which the Company anticipates to remain at zero.

The 2018 Warrants were reclassified to equity at June 30, 2020, the date all issued and outstanding shares of the Company's Class B Common Stock were cancelled.

The following table provides quantitative information regarding Level 3 fair value measurements:

	December 31, 2020
(in thousands)	2015 Private Warrants
Stock Price	$	23.17
Strike Price	$	11.50
Expected Life	1.91
Volatility	41.2		%
Risk Free rate	0.13		%
Dividend yield	—
Fair value of warrants	$	12.17

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The following table presents changes in Level 3 liabilities measured at fair value for the three months ended September 30, 2020:

(in thousands)	2015 Private Warrants
Balance - June 30, 2020	$	34,421
Measurement adjustment	22,303
Balance - September 30, 2020	$	56,724

The following table presents changes in Level 3 liabilities measured at fair value for the nine months ended September 30, 2021 and September 30, 2020.

(in thousands)	2015 Private Warrants
Balance - December 31, 2020	$	77,404
Exercise or conversion	(78,495)
Measurement adjustment	25,486
Repurchases	(24,395)
Balance - September 30, 2021	$	—

(in thousands)	2015 Private Warrants		2018 Warrants
Balance - December 31, 2019	$	72,705	$	58,369
Exercise or conversion	—		(416)
Measurement adjustment	(15,981)		(31,737)
Reclassification to equity at June 30, 2020	—		(26,216)
Balance - September 30, 2020	$	56,724	$	—

NOTE 14 - Restructuring

Restructuring costs include charges associated with exit or disposal activities that meet the definition of restructuring under FASB ASC Topic 420, Exit or Disposal Cost Obligations (“ASC 420”). The Company's restructuring plans are generally country or region specific and are typically completed within a one-year period. Restructuring costs incurred under these plans include (i) one-time termination benefits related to employee separations, (ii) contract termination costs, and (iii) other related costs associated with exit or disposal activities, including but not limited to, costs for consolidating or closing facilities other than lease costs accounted for under ASC 842. Costs related to the integration of acquired businesses that do not meet the definition of restructuring under ASC 420, such as employee training costs, duplicate facility costs and professional services expenses, are included within SG&A expense.

The following is a summary of the activity in the Company’s restructuring accruals for the three and nine months ended September 30, 2021 and 2020, which primarily relate to employee costs:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands)	2021		2020		2021		2020
Beginning balance	$	4,380	$	525	$	1,750	$	447
Charges	1,856		3,854		11,958		4,543
Cash payments	(3,845)		(2,432)		(5,548)		(3,027)
Foreign currency translation	—		2		—		3
Non-cash movements	(1,442)		133		(7,211)		116
Ending balance	$	949	$	2,082	$	949	$	2,082

    The restructuring charges during the three and nine months ended September 30, 2021 are driven by employee termination costs as a result of the elimination of positions due to the Merger. The restructuring charges during the three months ended September 30, 2020 are primarily driven by termination costs as a result of the Merger, and restructuring charges for the nine months ended September 30, 2020 are primarily driven by employee termination costs due to reductions in force in response to the COVID-19 pandemic and termination costs as a result of the Merger.

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The restructuring non-cash movements during the three and nine months ended September 30, 2021 primarily represent stock compensation costs recognized as a result of the modification of certain equity awards associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer.

Segments (as defined in Note 18)

The $1.9 million of restructuring charges for the three months ended September 30, 2021 includes $0.1 million of charges related to the NA Modular segment, $0.4 million of charges related to the NA Storage segment, and $1.4 million of unallocated charges.

The $3.9 million of restructuring charges for the three months ended September 30, 2020 includes $0.3 million of charges related to the NA Modular segment, $3.3 million of charges related to the NA Storage segment and $0.3 million of charges related to the UK Storage segment.

The $12.0 million of restructuring charges for the nine months ended September 30, 2021 includes $1.6 million of charges related to the NA Modular segment, $3.2 million of charges related to the NA Storage segment, and $7.2 million of unallocated charges.

The $4.5 million of restructuring charges for the nine months ended September 30, 2020 includes $0.9 million of charges pertaining to the NA Modular segment, $3.3 million of charges related to the NA Storage segment and $0.3 million of charges related to the UK Storage segment.

NOTE 15 - Stock-Based Compensation

Prior to the Merger, stock awards were granted under the WillScot Corporation 2017 Incentive Award Plan (the "2017 Incentive Plan"), which included Restricted Stock Awards ("RSAs") and Restricted Stock Units ("RSUs"). On June 24, 2020, WillScot's stockholders approved the WillScot Mobile Mini 2020 Incentive Award Plan ("2020 Incentive Plan") to take effect pending completion of the Merger. The plan amended and restated in its entirety the 2017 Incentive Plan. As a result, all historical and future incentive awards to the Company's Board of Directors, executive officers and employees, as determined by the Company's Compensation Committee ("the Comp Committee"), are granted under the 2020 Incentive Plan. The 2020 Incentive Plan is administered by the Comp Committee. Under the 2020 Incentive Plan, the Comp Committee may grant an aggregate of 6,488,988 shares of Common Stock in the form of non-qualified stock options, incentive stock options, stock appreciation rights, RSAs, RSUs, performance compensation awards and stock bonus awards. Stock-based payments, including the grant of stock options, RSAs and RSUs, are subject to service-based vesting requirements, and expense is recognized on a straight-line basis over the vesting period. Forfeitures are accounted for as they occur.

Stock-based compensation expense includes grants of stock options, time-based RSUs ("Time-Based RSUs") and performance-based RSUs ("Performance-Based RSUs", together with Time-Based RSUs, the "RSUs"). The 2020 Incentive Plan continues the former Market-Based RSUs renamed as "Performance-Based RSUs." RSUs are recognized in the financial statements based on their fair value. In addition, stock-based payments to non-executive directors include grants of RSAs. Time-Based RSUs and RSAs are valued based on the intrinsic value of the difference between the exercise price, if any, of the award and the fair market value of WillScot Mobile Mini's Common Stock on the grant date. Performance-Based RSUs are valued based on a Monte Carlo simulation model to reflect the impact of the Performance-Based RSUs market condition. The probability of satisfying a market condition is considered in the estimation of the grant-date fair value for Performance-Based RSUs and the compensation cost is not reversed if the market condition is not achieved, provided the requisite service has been provided.

Restricted Stock Awards

The following table summarizes the Company's RSA activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	57,448	$	11.75	52,755	$	14.69
Granted	44,708	29.30		65,959	11.75
Forfeited	(8,532)	29.30		—	—
Vested	(57,448)	11.75		(61,266)	14.28
Balance September 30,	36,176	$	29.30	57,448	$	11.75

Compensation expense for RSAs recognized in SG&A on the condensed consolidated statements of operations was $0.3 million for each of the three months ended September 30, 2021 and 2020. Compensation expense for RSAs recognized in SG&A on the condensed consolidated statements of operations was $0.6 million and $0.7 million for the nine months ended

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September 30, 2021 and 2020, respectively. At September 30, 2021, there was $0.7 million of unrecognized compensation cost related to RSAs that is expected to be recognized over the remaining weighted average vesting period of 0.7 years.

Time-Based RSUs

The following table summarizes the Company's Time-Based RSU activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	1,125,766	$	13.44	1,065,305	$	12.78
Granted	415,737	27.25		632,864	14.37
Forfeited	(65,153)	16.74		(22,728)	13.45
Vested	(467,055)	14.14		(323,678)	12.93
Balance September 30,	1,009,295	$	18.59	1,351,763	$	13.48

Compensation expense for Time-Based RSUs recognized in SG&A on the condensed consolidated statements of operations was $3.2 million and $1.6 million for the three months ended September 30, 2021 and 2020, respectively. Compensation expense for RSUs recognized in SG&A on the condensed consolidated statements of operations was $7.5 million and $3.9 million for the nine months ended September 30, 2021 and 2020, respectively. At September 30, 2021, unrecognized compensation cost related to Time-Based RSUs totaled $13.5 million and is expected to be recognized over the remaining weighted average vesting period of 2.3 years.

Included in restructuring costs for the three and nine months ended September 30, 2021 was expense of approximately $1.1 million and $5.9 million, respectively, recognized as a result of the modification of certain RSUs associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer.

Performance-Based RSUs

The following table summarizes the Company's Performance-Based RSU award activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	593,388	$	14.88	288,281	$	13.22
Granted	977,645	33.21		325,256	16.35
Forfeited	(20,077)	25.87		(12,700)	14.70
Balance September 30,	1,550,956	$	26.29	600,837	$	14.88

Compensation expense for Performance-Based RSUs recognized in SG&A on the condensed consolidated statements of operations was $2.7 million and $0.8 million for the three months ended September 30, 2021 and 2020, respectively. Compensation expense for Performance-Based RSUs recognized in SG&A on the condensed consolidated statements of operations was $5.8 million and $1.7 million for the nine months ended September 30, 2021 and 2020, respectively. At September 30, 2021, unrecognized compensation cost related to Performance-Based RSUs totaled $30.3 million and is expected to be recognized over the remaining vesting period of 2.7 years.

Included in restructuring costs for the three and nine months ended September 30, 2021 was expense of approximately $0.3 million and $1.3 million, respectively, recognized as a result of the modification of certain Performance-Based RSUs associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer.

Certain Performance-Based RSUs cliff vest based on achievement of the relative total stockholder return ("TSR") of the Company's Common Stock as compared to the TSR of the constituents in an index at the grant date over the performance period of three years. For certain 2021 grants, the TSR of the Company's Common Stock is compared to the TSR of the constituents in the S&P 400 Index. The target number of RSUs may be adjusted from 0% to 200% based on the TSR attainment levels defined by the Company's Compensation Committee. The 100% target payout is tied to performance at the 50% percentile, with a payout curve ranging from 0% (for performance less than the 25% percentile) to 200% (for performance above the 85% percentile). For grants in 2020 and prior, the TSR of the Company's Common Stock is compared to the TSR of constituents in the Russell 3000 Index. The target number of RSUs may be adjusted from 0% to 150% based on the TSR attainment levels defined by the Company's Compensation Committee. The 100% target payout is tied to performance at the

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50% percentile, with a payout curve ranging from 0% (for performance less than the 25% percentile) to 150% (for performance at or above the 75% percentile).

For 555,790 Performance-Based RSUs granted in 2021, the awards cliff vest based on achievement of specified share prices of the Company's Common Stock at annual measurement dates over performance periods of 4.5 to 4.8 years. The target number of RSUs may be adjusted from 0 to 1,333,334 based on the stock price attainment levels defined by the Company's Compensation Committee. The 555,790 RSU target payout is tied to a stock price of $47.50, with a payout ranging from 0 RSUs (for a stock price less than $42.50) to 1,333,334 RSUs (for a stock price of $60.00 or greater).

Stock Options

The following table summarizes the Company's stock option activity as of September 30, 2021:

	WillScot Options	Weighted-Average Exercise Price per Share		Converted Mobile Mini Options	Weighted-Average Exercise Price per Share
Balance December 31 , 2020	534,188	$	13.60	2,031,455	$	14.78
Forfeited	—	—		(6,240)	12.19
Exercised	—	—		(484,986)	15.26
Balance September 30, 2021	534,188	$	13.60	1,540,229	$	14.65
Fully vested and exercisable options, September 30, 2021	400,641	$	13.60	1,540,229	$	14.65

The following table summarizes the Company's stock option activity as of September 30, 2020:

	WillScot Options	Weighted-Average Exercise Price per Share		Converted Mobile Mini Options	Weighted-Average Exercise Price per Share
Balance, December 31, 2019	534,188	$	13.60	—	$	—
Converted at Merger	—	—		7,361,516	13.52
Exercised	—	—		(259,708)	11.99
Balance at September 30, 2020	534,188	$	13.60	7,101,808	$	13.58
Fully vested and exercisable options, September 30, 2020	267,094	$	13.60	7,101,808	$	13.58

WillScot Options

Compensation expense for stock option awards, recognized in SG&A on the condensed consolidated statements of operations, was $0.2 million for each of the three months ended September 30, 2021 and 2020. Compensation expense for stock option awards, recognized in SG&A on the condensed consolidated statements of operations, was $0.6 million for each of the nine months ended September 30, 2021 and 2020. At September 30, 2021, unrecognized compensation cost related to stock option awards totaled $0.3 million and is expected to be recognized over the remaining vesting period of 0.5 years.

NOTE 16 - Derivatives

On November 6, 2018, the Company entered into an interest rate swap agreement (the “Swap Agreement”) with a financial counterparty that effectively converts $400.0 million in aggregate notional amount of variable-rate debt under the Company’s ABL Facility into fixed-rate debt. The Swap Agreement will terminate on May 29, 2022. Under the terms of the Swap Agreement, the Company receives a floating rate equal to one-month LIBOR and makes payments based on a fixed rate of 3.06% on the notional amount. The receive rate under the terms of the Swap Agreement was 0.08% and 0.15% at September 30, 2021 and December 31, 2020, respectively.

The Swap Agreement was designated and qualified as a hedge of the Company’s exposure to changes in interest payment cash flows created by fluctuations in variable interest rates on the ABL Facility.

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The location and the fair value of derivative instruments designated as hedges, at the respective balance sheet dates, were as follows:

(in thousands)	Balance Sheet Account	September 30, 2021		December 31, 2020
Cash Flow Hedges:
Interest rate swap	Accrued expenses	$	8,380	$	11,619
Interest rate swap	Other non-current liabilities	$	—	$	5,308

The fair value of the interest rate swap is based on dealer quotes of market forward rates, a Level 2 input on the fair value hierarchy, and reflects the amount that the Company would receive or pay as of September 30, 2021 and December 31, 2020, respectively, for contracts involving the same attributes and maturity dates.

The following table discloses the impact of the interest rate swap, excluding the impact of income taxes, on other comprehensive income (“OCI”), AOCI and the Company’s statements of operations for the nine months ended September 30,:

(in thousands)	2021		2020
Gain (loss) recognized in OCI	$	8,528	$	(5,061)
Location of gain (loss) recognized in income	Interest expense		Interest expense
Loss reclassified from AOCI into income (effective portion)	$	(8,967)	$	(7,147)

NOTE 17 - Commitments and Contingencies

The Company is involved in various lawsuits, claims and legal proceedings that arise in the ordinary course of business. The Company assesses these matters on a case-by-case basis as they arise and establishes reserves as required. As of September 30, 2021, with respect to these outstanding matters, the Company believes that the amount or range of reasonably possible loss will not, either individually or in the aggregate, have a material adverse effect on the consolidated financial position, results of operations, or cash flows. However, the outcome of such matters is inherently unpredictable and subject to significant uncertainties.

NOTE 18 - Segment Reporting

The Company operates in four reportable segments as follows: North America Modular Solutions ("NA Modular"), North America Storage Solutions ("NA Storage"), United Kingdom Storage Solutions ("UK Storage") and Tank and Pump Solutions ("Tank and Pump"). Total assets for each reportable segment are not available because the Company utilizes a centralized approach to working capital management. Transactions between reportable segments are not significant.

In connection with the Merger, the Company determined its reportable segments as discussed above and retrospectively adjusted prior year's presentation to conform to the current presentation of reportable segments.

The Company defines EBITDA as net income (loss) plus interest (income) expense, income tax (benefit) expense, depreciation and amortization. The Company reflects the further adjustments to EBITDA ("Adjusted EBITDA") to exclude certain non-cash items and the effect of what the Company considers transactions or events not related to its core business operations. The Chief Operating Decision Maker ("CODM") evaluates business segment performance utilizing Adjusted EBITDA as shown in the reconciliation of the Company’s consolidated net income (loss) to Adjusted EBITDA below. Management believes that evaluating segment performance excluding such items is meaningful because it provides insight with respect to the intrinsic operating results of the Company.

The Company also regularly evaluates gross profit by segment to assist in the assessment of its operational performance. The Company considers Adjusted EBITDA to be the more important metric because it more fully captures the business performance of the segments, inclusive of indirect costs.

Reportable Segments

The following tables set forth certain information regarding each of the Company’s reportable segments for the three and nine months ended September 30, 2021 and 2020, respectively. Consistent with the financial statements, the segment results do not include Mobile Mini's operations prior to July 1, 2020. Please refer to the Management Discussion & Analysis of Financial Condition and Results of Operations included in this document, for pro forma results inclusive of Mobile Mini's financial results for periods prior to the Merger date.

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	Three Months Ended September 30, 2021
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	219,736	$	101,172	$	21,691	$	20,797			$	363,396
Delivery and installation	58,017		28,330		5,563		7,789				99,699
Sales revenue:
New units	13,483		1,307		580		490				15,860
Rental units	7,815		3,088		265		429				11,597
Total revenues	299,051		133,897		28,099		29,505				490,552
Costs:
Cost of leasing and services:
Leasing	59,260		14,393		4,314		4,481				82,448
Delivery and installation	51,655		19,328		3,238		6,770				80,991
Cost of sales:
New units	10,080		727		368		324				11,499
Rental units	3,636		1,587		245		135				5,603
Depreciation of rental equipment	46,566		5,366		1,058		3,472				56,462
Gross profit	$	127,854	$	92,496	$	18,876	$	14,323			$	253,549
Other selected data:
Adjusted EBITDA	$	106,825	$	59,123	$	13,255	$	10,946	$	—	$	190,149
Selling, general and administrative expense (a)	$	66,529	$	38,740	$	6,680	$	6,955	$	14,823	$	133,727
Purchases of rental equipment and refurbishments	$	31,789	$	11,920	$	11,649	$	5,016	$	—	$	60,374

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

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	Three Months Ended September 30, 2020
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	192,243	$	77,041	$	15,399	$	15,399			$	300,082
Delivery and installation	52,144		20,868		4,744		6,938				84,694
Sales revenue:
New units	14,024		3,783		1,011		542				19,360
Rental units	9,456		2,801		499		423				13,179
Total revenues	267,867		104,493		21,653		23,302				417,315
Costs:
Cost of leasing and services:
Leasing	49,516		9,260		3,382		2,630				64,788
Delivery and installation	44,465		13,120		3,240		5,529				66,354
Cost of sales:
New units	9,484		2,351		726		374				12,935
Rental units	6,356		1,930		466		85				8,837
Depreciation of rental equipment	45,967		4,448		1,168		3,254				54,837
Gross profit	$	112,079	$	73,384	$	12,671	$	11,430			$	209,564
Other selected data:
Adjusted EBITDA	$	100,281	$	46,465	$	8,306	$	8,507	$	—	$	163,559
Selling, general and administrative expense (a)	$	58,935	$	31,368	$	5,533	$	6,177	$	62,257	$	164,270
Purchases of rental equipment and refurbishments	$	34,249	$	7,234	$	677	$	431	$	—	$	42,591

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

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	Nine Months Ended September 30, 2021
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	636,979	$	267,489	$	61,426	$	56,343			$	1,022,237
Delivery and installation	161,548		73,214		18,152		21,969				274,883
Sales revenue:
New units	27,814		5,355		2,746		1,908				37,823
Rental units	28,316		11,381		1,214		1,123				42,034
Total revenues	854,657		357,439		83,538		81,343				1,376,977
Costs:
Cost of leasing and services:
Leasing	172,108		37,300		13,339		12,628				235,375
Delivery and installation	147,514		51,811		10,638		18,317				228,280
Cost of sales:
New units	19,330		3,190		1,802		1,338				25,660
Rental units	14,611		6,667		1,163		429				22,870
Depreciation of rental equipment	144,102		17,635		3,290		10,026				175,053
Gross profit	$	356,992	$	240,836	$	53,306	$	38,605			$	689,739
Other selected data:
Adjusted EBITDA	$	307,741	$	154,971	$	36,647	$	29,870	$	—	$	529,229
Selling, general and administrative expense (a)	$	192,285	$	103,501	$	19,949	$	18,868	$	38,840	$	373,443
Purchases of rental equipment and refurbishments	$	120,288	$	24,165	$	22,645	$	11,093	$	—	$	178,191

(a) Includes both SG&A expense and Transaction costs from the consolidated statement of operations.

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	Nine Months Ended September 30, 2020
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	570,738	$	77,041	$	15,399	$	15,399			$	678,577
Delivery and installation	154,854		20,868		4,744		6,938				187,404
Sales revenue:
New units	33,400		3,783		1,011		542				38,736
Rental units	21,558		2,801		499		423				25,281
Total revenues	780,550		104,493		21,653		23,302				929,998
Costs:
Cost of leasing and services:
Leasing	147,072		9,260		3,382		2,630				162,344
Delivery and installation	131,853		13,120		3,240		5,529				153,742
Cost of sales:
New units	22,018		2,351		726		374				25,469
Rental units	13,965		1,930		466		85				16,446
Depreciation of rental equipment	137,409		4,448		1,168		3,254				146,279
Gross profit	$	328,233	$	73,384	$	12,671	$	11,430			$	425,718
Other selected data:
Adjusted EBITDA	$	287,345	$	46,465	$	8,306	$	8,507	$	—	$	350,623
Selling, general and administrative expense (a)	$	180,791	$	31,368	$	5,533	$	6,177	$	80,641	$	304,510
Purchases of rental equipment and refurbishments	$	113,931	$	7,234	$	677	$	431	$	—	$	122,273

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

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The following tables present a reconciliation of the Company’s income (loss) from operations to Adjusted EBITDA for the three and nine months ended September 30, 2021 and 2020, respectively:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Net income (loss)	$	61,103	$	(6,051)	$	85,921	$	71,474
Income tax expense (benefit)	6,644		(66,675)		35,953		(66,170)
Loss on extinguishment of debt	—		42,401		5,999		42,401
Fair value loss (gain) on common stock warrant liabilities	—		22,303		26,597		(46,063)
Interest expense	29,201		33,034		88,377		89,810
Depreciation and amortization	75,276		71,704		233,813		169,103
Currency losses (gains), net	127		(371)		196		147
Restructuring costs, lease impairment expense and other related charges	2,457		4,798		14,286		8,542
Transaction costs	303		52,191		1,147		63,241
Integration costs	8,247		7,083		23,211		10,921
Stock compensation expense	6,259		2,944		14,480		6,958
Other	532		198		(751)		259
Adjusted EBITDA	$	190,149	$	163,559	$	529,229	$	350,623

Included in restructuring costs for the three and nine months ended September 30, 2021 was expense of approximately $1.4 million and $7.2 million, respectively, recognized as a result of the modification of certain equity awards associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer. For the nine months ended September 30, 2021, stock-based compensation expense reported in the Statement of Cash Flows included these charges.

NOTE 19 - Earnings (Loss) Per Share

Basic earnings (loss) per share (“EPS”) is calculated by dividing net income (loss) attributable to WillScot Mobile Mini by the weighted average number of shares of Common Stock outstanding during the period. The shares of Common Stock issued as a result of the vesting of RSUs and RSAs as well as the exercise of stock options or redemption of warrants were included in EPS based on the weighted average number of days in which they were vested and outstanding during the period.

Prior to June 30, 2020, the Company had shares of Class B Common Stock which had no rights to dividends or distributions made by the Company and, in turn, were excluded from the EPS calculation. On June 30, 2020, the Sapphire Exchange was completed, and all shares of Class B Common Stock were cancelled, and Sapphire Holdings received 10,641,182 shares of Common Stock.

Diluted EPS is computed similarly to basic EPS, except that it includes the potential dilution that would occur if dilutive securities were exercised. Effects of potentially dilutive securities are presented only in periods in which they are dilutive. When liability-classified warrants are in the money and the impact of their inclusion on diluted EPS is dilutive, diluted EPS also assumes share settlement of such instruments through an adjustment to net income available to common stockholders for the fair value (gain) loss on common stock warrant liabilities and inclusion of the number of dilutive shares in the denominator.

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The following table reconciles net income attributable to WillScot Mobile Mini common shareholders and the weighted average shares outstanding for the basic calculation to the weighted average shares outstanding for the diluted calculation:

	Three Months Ended				Nine Months Ended
	September 30				September 30
(in thousands)	2021		2020		2021		2020
Numerator:
Net income (loss) attributable to common shareholders - basic	$	61,103	$	(6,051)	$	85,921	$	70,261
Fair value gain on common stock warrant liabilities	—		—		—		(47,718)
Net income (loss) attributable to common shareholders - dilutive	$	61,103	$	(6,051)	$	85,921	$	22,543
Denominator:
Weighted average Common Shares outstanding - basic	225,998		226,650		227,558		149,283
Dilutive effect of shares outstanding
Warrants	3,722		—		4,112		2,122
RSAs	4		—		25		31
Time-based RSUs	476		—		573		314
Performance-based RSUs	618		—		751		272
Stock Options	1,050		—		1,066		411
Weighted average Common Shares outstanding - dilutive	231,868		226,650		234,085		152,433

The following potential common shares were excluded from the computation of dilutive EPS because their effect would have been anti-dilutive:

	Three Months Ended		Nine Months Ended
	September 30		September 30
(in thousands)	2021	2020	2021	2020
Warrants	—	18,758	—	—
RSAs	—	57	—	—
Time-based RSUs	—	1,352	—	—
Performance-based RSUs	—	184	—	—
Stock Options	—	7,630	—	—

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NOTE 20 - Related Parties

Related party balances included in the Company’s condensed consolidated balance sheets at September 30, 2021 and December 31, 2020, consisted of the following:

(in thousands)	Financial Statement Line Item	September 30, 2021		December 31, 2020
Receivables due from affiliates	Trade receivables, net of allowances for credit losses	$	433	$	30
Amounts due to affiliates	Accrued expenses	(392)		(461)
Total related party liabilities, net		$	41	$	(431)

Related party transactions included in the Company’s condensed consolidated statements of operations for the three and nine months ended September 30, 2021 and 2020, respectively, consisted of the following:

		Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	Financial Statement Line Item	2021		2020		2021		2020
Leasing revenue from related parties	Leasing revenue	$	541	$	504	$	706	$	1,330
Consulting expense to related party	Selling, general & administrative expense	(1,511)		(1,738)		(3,660)		(4,733)
Total related party expense, net		$	(970)	$	(1,234)	$	(2,954)	$	(3,403)

On June 30, 2020, the Company completed the Sapphire Exchange, whereby Sapphire Holdings, an affiliate of TDR Capital, exchanged shares of Class B Common Stock for 10,641,182 shares of Class A Common Stock. As a result of the Sapphire Exchange, all issued and outstanding shares of WillScot’s Class B Common Stock were automatically canceled for no consideration and the existing exchange agreement was automatically terminated.

On August 22, 2018, WillScot’s principal stockholder, Sapphire Holdings, entered into a margin loan (the "Margin Loan") under which all of its shares of WillScot Mobile Mini Common Stock were pledged to secure borrowings of up to $125.0 million under the loan agreement. WillScot Mobile Mini was not a party to the loan agreement and had no obligations thereunder. On June 29, 2021, Sapphire Holdings repaid all outstanding amounts under the Margin Loan with proceeds from the sale of certain shares of WillScot Mobile Mini and no WillScot Mobile Mini shares remain pledged thereunder.

On March 1, 2021, the Company repurchased from Sapphire Holdings and cancelled 2,750,000 shares of its Common Stock. On June 29, 2021, the Company repurchased from Sapphire Holdings and cancelled an additional 3,900,000 shares of its Common Stock. Following the reduction in Sapphire Holdings’ beneficial ownership of Common Stock resulting from the foregoing repurchases and the underwritten secondary offering by Sapphire Holdings of 16,100,000 shares of Common Stock on June 25, 2021, Gary Lindsay resigned his position as a member of the WillScot Mobile Mini board of directors pursuant to the terms of the shareholders agreement dated July 1, 2020 between Sapphire Holdings, TDR Capital II Holdings L.P., TDR Capital, L.L.P. and WillScot Mobile Mini.

On September 9, 2021, the Company repurchased from Sapphire Holdings and cancelled an additional 2,379,839 shares of its common stock, and Sapphire Holdings sold its remaining 21,410,019 shares through an underwritten secondary offering. Following the reduction in Sapphire Holdings' beneficial ownership of Common Stock resulting from the foregoing repurchase and secondary offering, Stephen Robertson resigned his position as a member of the Willscot Mobile Mini board of directors pursuant to the aforementioned shareholders agreement dated July 1, 2020, and Sapphire Holdings, TDR Capital II Holdings L.P. and TDR Capital, L.L.P. ceased to be related parties of WillScot Mobile Mini.

The Company purchased rental equipment from former related party affiliates for $1.0 million for the three months ended September 30, 2020. The Company purchased rental equipment from related party affiliates of $2.5 million and $2.6 million for the nine months ended September 30, 2021 and 2020, respectively.

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ITEM 2.    Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”) is intended to help the reader understand WillScot Mobile Mini Holdings Corp. ("WillScot Mobile Mini"), formerly known as WillScot Corporation ("WillScot"), our operations and our present business environment. MD&A is provided as a supplement to, and should be read in conjunction with, our financial statements and the accompanying notes thereto, contained in Part I, Item 1 of this report. The discussion of results of operations in this MD&A is presented on a historical basis, as of or for the three and nine months ended September 30, 2021 or prior periods. On July 1, 2020, WillScot and Mobile Mini, Inc. (“Mobile Mini”) merged (the “Merger”). As the Merger was completed on July 1, 2020, unless the context otherwise requires, the terms “we”, “us”, “our” “Company” and “WillScot Mobile Mini” as used in these financial statements mean WillScot Corporation and its subsidiaries when referring to periods prior to July 1, 2020 (prior to the Merger) and to WillScot Mobile Mini when referring to periods on or after July 1, 2020 (after the Merger).

The consolidated financial statements were prepared in conformity with accounting principles generally accepted in the US (“GAAP”). We use certain non-GAAP financial information that we believe is important for purposes of comparison to prior periods and development of future projections and earnings growth prospects. This information is also used by management to measure the profitability of our ongoing operations and analyze our business performance and trends. Reconciliations of non-GAAP measures are provided in the Other Non-GAAP Financial Data and Reconciliations section.

Executive Summary and Outlook

We are a leading business services provider specializing in innovative flexible work space and portable storage solutions. We service diverse end markets across all sectors of the economy throughout the United States ("US"), Canada, Mexico and the United Kingdom ("UK"). We are also a leading provider of specialty containment solutions in the US with over 12,800 tank and pump units in our fleet. As of September 30, 2021, our branch network included approximately 275 branch locations and additional drop lots to service over 85,000 customers. We offer our customers an extensive selection of “Ready to Work” modular space and portable storage solutions with over 155,000 modular space units and over 205,000 portable storage units in our fleet.

We primarily lease, rather than sell, our modular and portable storage units to customers, which results in a highly diversified and predictable recurring revenue stream. Over 90% of new lease orders are on our standard lease agreement, pre-negotiated master lease or national account agreements. The initial lease periods vary, and our leases are customarily renewable on a month-to-month basis after their initial term. Our lease revenue is highly predictable due to its recurring nature and the underlying stability and diversification of our lease portfolio. However, given that our customers value flexibility, they consistently extend their leases or renew on a month-to-month basis such that the average effective duration of our lease portfolio excluding seasonal portable storage units is nearly 30 months. We complement our core leasing business by selling both new and used units, allowing us to leverage scale, achieve purchasing benefits and redeploy capital employed in our lease fleet.

Our customers operate in a diversified set of end markets, including construction, commercial and industrial, retail and wholesale trade, education, energy and natural resources, government, and healthcare. Core to our operating model is the ability to redeploy standardized assets across end markets, as we did in 2020 to service emerging demand in the healthcare and government sectors related to COVID-19, as well as expanded space requirements related to social distancing. We track several market leading indicators including those related to our two largest end markets, the commercial and industrial segment and the construction segment, which together accounted for over 85% of our revenues for the three months ended September 30, 2021.

We remain focused on our core priorities of growing leasing revenues by increasing units on rent, both organically and through our consolidation strategy, delivering “Ready to Work” solutions to our customers with value added products and services ("VAPS"), and on continually improving the overall customer experience.

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Significant Developments

Mobile Mini Merger

On July 1, 2020, we closed the Merger at which time Mobile Mini became a wholly-owned subsidiary of WillScot. Concurrent with the closing of the Merger, we changed our name to WillScot Mobile Mini Holdings Corp. We believe that the Merger is resulting in strategic and financial benefits by combining the two industry leaders in the complementary modular space and portable storage solutions markets. As part of the Merger, we planned to integrate the two companies' customer relationship management, operating, and financial systems. A significant portion of these efforts to date had been focused on the conversion of the combined company onto a single enterprise resource planning system, which was successfully completed during the second quarter of 2021.

Other Acquisitions

On September 17, 2021, the Company acquired certain assets and liabilities of three companies in the United States that focus primarily in the portable storage solutions market for $56.3 million in cash. The primary assets acquired included approximately 11,000 storage units and 400 modular units, the majority of which were on rent. See Note 2 to the condensed consolidated financial statements for further discussion. We continue to manage a pipeline of potential acquisition targets and anticipate that mergers and acquisitions will be a significant portion of our capital allocation priorities.

Reportable Segments

Following the Merger, we operate in four reporting segments: NA Modular, NA Storage, UK Storage, and Tank and Pump. Prior to the Merger, WillScot had two reporting segments, US Modular and Other North America Modular. These two segments were combined to create the NA Modular segment, which represents the legacy WillScot operations. The other segments, NA Storage, UK Storage, and Tank and Pump, align to the legacy operations and segments reported by Mobile Mini. The reporting segments are aligned with how we operate and analyze our business results. During the third quarter of 2021, the majority of the portable storage product business within the NA Modular segment was transitioned to the NA Storage segment, and associated revenues, expenses, and operating metrics beginning in the third quarter of 2021 were transferred to the NA Storage segment.

Financing Activities

On March 26, 2021, we redeemed $65.0 million of our 6.125% senior secured notes due 2025 (the “2025 Secured Notes”) at a redemption price of 103.0%, plus accrued and unpaid interest. This repayment was funded by internally generated cash flow and lower cost borrowings under the 2020 ABL facility. Upon redemption in the first quarter of 2021, we recorded a loss on extinguishment of debt in the condensed consolidated statement of operations of $3.2 million comprised of a redemption premium of $1.9 million and write off of unamortized deferred financing fees of $1.3 million.

On June 16, 2021, we redeemed an additional $58.5 million of our 2025 Secured Notes at a redemption price of 103.0%, plus accrued and unpaid interest. This repayment was funded by internally generated cash flow and lower cost borrowings under the 2020 ABL facility. Upon redemption in the second quarter of 2021, we recorded a loss on extinguishment of debt in the condensed consolidated statement of operations of $2.8 million comprised of a redemption premium of $1.8 million and write off of unamortized deferred financing fees of $1.0 million.

Share and Warrant Repurchases

On March 1, 2021, we repurchased and cancelled 2,750,000 shares of our Common Stock directly from Sapphire Holding S.à r.l. (“Sapphire Holdings”), our largest shareholder at that time, which is controlled by TDR Capital LLP (“TDR Capital”), for $73.7 million. On June 29, 2021, we repurchased and cancelled an additional 3,900,000 shares of our Common Stock directly from Sapphire Holdings for $108.2 million. On September 9, 2021, we repurchased and cancelled an additional 2,379,839 shares of our Common Stock directly from Sapphire Holdings for $67.1 million.

During the nine months ended September 30, 2021, we repurchased and cancelled 3,055,000 2015 Private Warrants for $25.5 million. In addition, during the nine months ended September 30, 2021, 9,655,000 2015 Private Warrants were exercised on a cashless basis, resulting in the issuance of 2,939,898 shares of Common Stock. As a result of these transactions, no 2015 Private Warrants were outstanding as of September 30, 2021.

During the nine months ended September 30, 2021, we repurchased and cancelled 223,310 2018 Warrants for $2.3 million. In addition, during the nine months ended September 30, 2021, 2,981,195 of the 2018 Warrants were exercised on a cashless basis, resulting in the issuance of 1,372,548 shares of common stock. At September 30, 2021, 6,525,736 of the 2018 Warrants were outstanding.

During the nine months ended September 30, 2021, we repurchased a total of 11,656,552 shares of Common Stock and stock equivalents for $322.6 million, including the shares repurchased from Sapphire Holdings and all repurchased warrants. As of September 30, 2021, we had $142.2 million remaining of a $500.0 million share repurchase authorization under our stock repurchase program. Given the predictability of our free cash flow, we believe that repurchases will be a reoccurring capital allocation priority. In October of 2021, the Company's Board of Directors replaced the existing share repurchase program with a new share repurchase program that authorizes the Company to repurchase up to $1.0 billion of its outstanding shares of Common Stock and equivalents.

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COVID-19 Impact on Business

Since the outbreak of COVID-19 was designated as a global pandemic by the World Health Organization (the “WHO”) in March 2020, our operations have generally continued to operate normally with additional safety protocols in place as we have been considered an essential business in most jurisdictions. The global macroeconomic backdrop and impact on our end markets has evolved rapidly since the beginning of 2020. However, overall our lease portfolio and financial results have proven to be durable and predictable despite the severity of the economic contraction in 2020 and the current expansion in 2021. On a pro forma basis, our deliveries were down 25% in the second quarter of 2020 year over year and 13% in the third quarter of 2020 year over year due to COVID-19 related economic contraction in our largest geographic markets. This reduced delivery demand slowed the growth of our leasing revenues as well as our delivery and installation revenues. However, we successfully implemented significant variable cost and capital expenditure reductions to help offset the financial impact of the temporarily reduced activity levels.

Importantly, due to our long lease durations, the majority of our gross profit in any given period is from units already out on rent. This gives us significant forward visibility into our future cash flows, which allows us to plan ahead and adjust our capital expenditures and cost structure for varying demand levels. As expected, our portfolio of units already out on rent at the onset of the pandemic was resilient and largely unimpacted, despite the unprecedented swings in economic activity in 2020.

Activity levels in the fourth quarter of 2020 and the first half of 2021 stabilized, and our volume of new lease activations grew significantly in the second quarter of 2021 as economic activity rebounded sharply with modular deliveries across our NA Modular and NA Storage segments up a combined 9% over 2020 levels and storage product deliveries across these two segments up a combined 39% over 2020 levels and on par with 2019 pro forma activity levels. This recovery continued in the third quarter of 2021 and for the three months ended September 30, 2021, both modular and storage product deliveries across our NA Modular and NA Storage segments were up a combined 6% over 2020 levels. Overall, while new lease activation volumes over the past seven quarters were impacted in line with the swings in economic activity, our lease revenue streams were stable and predictable and remain on an attractive upward long-term trajectory, which is a direct reflection of the diversification in our end markets, our long lease durations, and the success of the organic growth initiatives that we are executing.

Third Quarter Highlights

For the three months ended September 30, 2021, key drivers of our financial performance included:

•Total revenues increased by $73.3 million, or 17.6%. Leasing revenue increased $63.3 million, or 21.1%, delivery and installation revenue increased $15.0 million, or 17.7%, rental unit sales decreased $1.6 million, or 12.1%, and new sales revenue decreased $3.5 million, or 18.0%.

Key leasing revenue drivers include:

–Average portable storage units on rent increased 19,408 units, or 13.5%, and average modular space units on rent decreased 1,395 units, or 1.3%. The increase in average portable storage units on rent was driven by significant increases in delivery activity during 2021 as economic activity rebounded versus 2020 more quickly across portable storage units than modular space units.

–Average modular space monthly rental rate increased $127, or 19.8%, to $767 driven by strong pricing performance across all relevant segments. Average modular space monthly rental rates increased by $141, or 20.3%, in the NA Modular segment, by $97, or 19.2%, in the NA Storage segment, and by $98, or 27.5% in the UK Storage segment.

–Average portable storage monthly rental rate increased $14, or 10.7%, to $145 driven by increased pricing as a result of our price management tools and processes, further supported by tight supply on portable storage containers in the markets in which we operate.

–Average utilization for portable storage units increased to 83.9% from 73.2% for the same period in 2020 driven by increased demand in 2021 as compared to the same period in 2020. Average utilization for modular space units decreased 50 basis points ("bps") to 70.1%.

•NA Modular segment revenue, which represents 61.0% of consolidated revenue for the three months ended September 30, 2021, increased $31.2 million, or 11.6%, to $299.1 million. The increase was driven by our core leasing revenue, which grew $27.5 million, or 14.3%, due to continued growth of pricing and value added products. Delivery and installation revenues increased $5.9 million, or 11.3%, driven by increased demand for new project deliveries as compared to 2020, which was significantly impacted by slowdowns associated with COVID-19. The increases to leasing revenue and delivery and installation revenues were partially offset by declines in revenues for portable storage units as the result of transitioning the majority of the portable storage product business within the NA Modular segment to the NA Storage segment. Rental unit sales decreased $1.8 million, or 18.8%, and new unit sales decreased $0.5 million, or 3.6%. NA Modular revenue drivers for the three months ended September 30, 2021 included:

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–Modular space average monthly rental rate of $834, increased 20.3% year over year representing a continuation of the long-term price optimization and VAPS penetration opportunities across our portfolio.

–Average modular space units on rent decreased 2,182, or 2.5%, year over year driven by lower deliveries during 2020 as a result of the COVID-19 pandemic. Sequentially from June 30, 2021, modular space units on rent increased approximately 700 units, or 0.8% during the third quarter.

–Average modular space monthly utilization decreased 70 bps to 67.6% for the three months ended September 30, 2021, as compared to the three months ended September 30, 2020. Sequentially from the second quarter, average modular utilization decreased 10 bps, however end of period utilization increased over 100 bps from June 30, 2021 to September 30, 2021.

•NA Storage segment revenue, which represents 27.3% of consolidated revenue for the three months ended September 30, 2021, increased $29.4 million, or 28.1%, to $133.9 million. The increase was driven by our core leasing revenue, which grew $24.2 million, or 31.4%, due to increased units on rent driven by significant increases in delivery activity during 2021 as economic activity rebounded versus 2020, and increased pricing. Delivery and installation revenues increased $7.4 million, or 35.4%, driven by increased demand for new project deliveries as compared to 2020, which was significantly impacted by slowdowns associated with COVID-19. The increases to leasing revenue and delivery and installation revenues in the NA Storage segment were also impacted as the result of transitioning the majority of the portable storage product business within the NA Modular segment to the NA Storage segment. Rental unit sales increased $0.3 million, or 10.7%, and new unit sales decreased $2.5 million, or 65.8%. NA Storage revenue drivers for the three months ended September 30, 2021 included:

•Portable storage average monthly rental rate of $155, increased 6.9% year over year as a result of our price management tools and processes, further supported by tight supply on portable storage containers in the markets in which we operate. Modular space average monthly rental rate of $602, increased 19.2% year over year as a result of price optimization and early benefits from increased VAPS penetration opportunities.

•Average portable storage units on rent increased 31,902, or 30.3%, year over year driven by significant increases in delivery activity during 2021 as economic activity rebounded versus 2020. NA Storage portable storage units on rent also increased as a result of the transitioning of the majority of the portable storage product business within the NA Modular segment to the NA Storage segment during the third quarter, which represented the transfer of approximately 12,000 units on rent. Combined, average portable storage units on rent for the NA Storage and NA Modular segments increased approximately 16,922 units, or 14.0%. Given the timing of acquisitions during the quarter, acquisition units did not have a material impact on average units on rent. Average modular space units on rent were essentially flat year over year.

•Average portable storage monthly utilization increased 980 bps to 83.2% for the three months ended September 30, 2021, as compared to the three months ended September 30, 2020. Average modular space monthly utilization decreased 280 bps to 77.6% for three months ended September 30, 2021, as compared to the three months ended September 30, 2020.

•Generated consolidated net income of $61.1 million for the three months ended September 30, 2021. Net Income Excluding Gain/Loss from Warrants of $61.1 million for the three months ended September 30, 2021 represented an increase of $44.8 million versus the three months ended September 30, 2020, and included $11.1 million of discrete costs expensed in the period related to merger integration activities. Discrete costs in the period included $8.6 million of integration and transaction costs and $2.5 million of restructuring costs, lease impairment expense and other related charges.

•Adjusted EBITDA of $190.1 million for the three months ended September 30, 2021 represented an increase of $26.5 million, or 16.2%, as compared to the same period in 2020. This increase was driven primarily by increased leasing gross profit.

•Consolidated Adjusted EBITDA Margin was 38.8% in the third quarter of 2021 and decreased 50 bps versus prior year driven by an expected higher proportion of delivery and installation revenues to total revenues and increased variable costs as a result of higher activity levels in the current year quarter.

•Generated Free Cash Flow of $78.5 million for the three months ended September 30, 2021 representing an increase of $50.5 million as compared to the same period in 2020. Net cash provided by operating activities increased $69.0 million to $130.4 million. Net cash used in investing activities increased by $18.7 million to support increases in delivery activity during 2021 as economic activity rebounded versus 2020.

•Returned $106.3 million to shareholders through stock and warrant repurchases and closed three acquisitions totaling approximately 11,000 storage units and 400 modular units for $56.3 million in cash during the three months ended September 30, 2021. The predictability of our free cash flow allows us to pursue multiple capital allocation priorities opportunistically, including investing in organic opportunities we see in the market, continuing our deleveraging trajectory, opportunistically executing accretive acquisitions, and returning capital to shareholders.

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Consolidated Results of Operations

Three Months Ended September 30, 2021 Compared to the Three Months Ended September 30, 2020

Our condensed consolidated statements of operations for the three months ended September 30, 2021 and 2020 are presented below. The below results only include Mobile Mini for the periods subsequent to the Merger:

	Three Months Ended September 30,				2021 vs. 2020 $ Change
(in thousands)	2021		2020
Revenues:
Leasing and services revenue:
Leasing	$	363,396	$	300,082	$	63,314
Delivery and installation	99,699		84,694		15,005
Sales revenue:
New units	15,860		19,360		(3,500)
Rental units	11,597		13,179		(1,582)
Total revenues	490,552		417,315		73,237
Costs:
Costs of leasing and services:
Leasing	82,448		64,788		17,660
Delivery and installation	80,991		66,354		14,637
Costs of sales:
New units	11,499		12,935		(1,436)
Rental units	5,603		8,837		(3,234)
Depreciation of rental equipment	56,462		54,837		1,625
Gross profit	253,549		209,564		43,985
Expenses:
Selling, general and administrative	133,424		112,079		21,345
Transaction costs	303		52,191		(51,888)
Other depreciation and amortization	18,814		16,867		1,947
Lease impairment expense and other related charges	601		944		(343)
Restructuring costs	1,856		3,854		(1,998)
Currency losses (gains), net	127		(371)		498
Other expense (income), net	1,476		(1,012)		2,488
Operating income	96,948		25,012		71,936
Interest expense	29,201		33,034		(3,833)
Fair value loss on common stock warrant liabilities	—		22,303		(22,303)
Loss on extinguishment of debt	—		42,401		(42,401)
Income (loss) before income tax	67,747		(72,726)		140,473
Income tax expense (benefit)	6,644		(66,675)		73,319
Net income (loss) attributable to WillScot Mobile Mini	$	61,103	$	(6,051)	$	67,154

Comparison of Three Months Ended September 30, 2021 and 2020

Revenue: Total revenue increased $73.3 million, or 17.6%, to $490.6 million for the three months ended September 30, 2021 from $417.3 million for the three months ended September 30, 2020. Leasing revenue increased $63.3 million, or 21.1%, as compared to the same period in 2020 driven by improved pricing and value added products, and an increase of 19,408 average portable storage units on rent driven by significant increases in delivery activity during 2021 across portable storage units as economic activity rebounded versus 2020. Delivery and installation revenues increased $15.0 million, or 17.7%, due to increased overall activity across all of our segments. Rental unit sales decreased $1.6 million, or 12.1%, and new unit sales decreased $3.5 million, or 18.0%.

Total average units on rent for the three months ended September 30, 2021 and 2020 were 273,080 and 255,067, respectively, representing an increase of 18,013, or 7.1%. Portable storage average units on rent increased by 19,408 units, or

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13.5%, for the three months ended September 30, 2021 driven by strong delivery growth in 2021 as a result of increased economic activity versus 2020. The average portable storage unit utilization rate during the three months ended September 30, 2021 was 83.9%, as compared to 73.2% during the same period in 2020. Modular space average units on rent decreased 1,395 units, or 1.3%, for the three months ended September 30, 2021 as compared to the three months ended September 30, 2020 driven by lower deliveries during 2020 as a result of the COVID-19 pandemic and delivery activity in 2021 has not rebounded as significantly for modular products as it has for portable storage products. The average modular space unit utilization rate during the three months ended September 30, 2021 was 70.1%, as compared to 70.6% during the same period in 2020.

Modular space average monthly rental rates increased 19.8% to $767 for the three months ended September 30, 2021. Improved pricing was achieved across all relevant segments. Average modular space monthly rental rates increased by $141, or 20.3%, to $834 in the NA Modular segment, by $97, or 19.2%, in the NA Storage segment, and by $98, or 27.5% in the UK Storage segment. Increases were driven by a continuation of the long-term price optimization and VAPS penetration opportunities across our NA Modular segment as well as by some early application of these same price management tools and processes across the NA Storage and UK Storage segments. NA Storage also is beginning to see early benefits from increased VAPS penetration opportunities.

Average portable storage monthly rental rates increased 10.7% to $145 for the three months ended September 30, 2021 driven by our price management tools and processes, further supported by tight supply on portable storage containers in the markets in which we operate.

Gross Profit: Our gross profit percentage was 51.7% and 50.2% for the three months ended September 30, 2021 and 2020, respectively. Our gross profit percentage, excluding the effects of depreciation, was 63.2% and 63.4% for the three months ended September 30, 2021 and 2020, respectively.

Gross profit increased $44.0 million, or 21.0%, to $253.5 million for the three months ended September 30, 2021 from $209.6 million for the three months ended September 30, 2020. The increase in gross profit is a result of a $45.7 million increase in leasing gross profit and increased delivery and installation gross profit of $0.4 million, partially offset by decreased new and rental unit sale margins of $0.5 million. Increases were primarily a result of increased revenues due to favorable average monthly rental rates across both portable storage and modular space units, as well as due to increased portable storage units on rent, partially offset by increased variable costs during the period as a result of increased delivery activity. Depreciation increased $1.6 million as a result of capital investments made over the past twelve months in our existing rental equipment.

SG&A: Selling, general and administrative ("SG&A") increased $21.3 million, or 19.0%, to $133.4 million for the three months ended September 30, 2021, compared to $112.1 million for the three months ended September 30, 2020. Approximately $6.9 million of the increase is related to variable compensation and commissions related to increased delivery activity and financial performance with other increases in occupancy costs, insurance costs, and increased travel and entertainment costs as travel reopened a bit more as compared to 2020. Additionally, as a result of the Merger and the related integration, integration costs increased $1.1 million to $8.2 million for the three months ended September 30, 2021, compared to $7.1 million for the three months ended September 30, 2020, and stock compensation expense increased $3.4 million to $6.3 million for the three months ended September 30, 2021, compared to $2.9 million for the three months ended September 30, 2020.

Transaction Costs: Transaction costs decreased from $52.2 million for the three months ended September 30, 2020 to $0.3 million for the three months ended September 30, 2021. Transaction costs for the three months ended September 30, 2020 were related to the Merger which closed on July 1, 2020.

Other Depreciation and Amortization: Other depreciation and amortization increased $1.9 million to $18.8 million for the three months ended September 30, 2021 compared to $16.9 million for the three months ended September 30, 2020. The increase was driven by increased depreciation as a result of our recent investments in our enterprise resource planning system and other infrastructure investments across our branch network.

Lease Impairment Expense and Other Related Charges: Lease impairment expense and other related charges was $0.6 million for the three months ended September 30, 2021 as compared to $0.9 million for the three months ended September 30, 2020.

Restructuring Costs: In the three months ended September 30, 2021, the Company had $1.9 million of restructuring costs. In the three months ended September 30, 2020, the Company had $3.9 million of restructuring costs. Restructuring costs in both periods were primarily driven by employee termination costs as a result of the elimination of positions due to the Merger.

Currency Losses (Gains), net: Currency losses, net changed by $0.5 million to a $0.1 million loss for the three months ended September 30, 2021 from a $0.4 million gain for the three months ended September 30, 2020. This change was primarily attributable to the impact of foreign currency exchanges rate changes on intercompany receivables and payables denominated in a currency other than the subsidiary's functional currency.

Other Expense (Income), Net: Other expense (income), net was expense of $1.5 million for the three months ended September 30, 2021 compared to income of $1.0 million for the three months ended September 30, 2020. Other expense, net

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of $1.5 million for the three months ended September 30, 2021 is primarily related to losses incurred related to Hurricane Ida in the Gulf Coast area of the United States, and other income, net of $1.0 million for the three months ended September 30, 2020 reflected the reversal of a non-income tax liability of $1.3 million.

Interest Expense: Interest expense decreased $3.8 million, or 11.5%, to $29.2 million for the three months ended September 30, 2021 from $33.0 million for the three months ended September 30, 2020. The decrease in interest expense is a result of the lower overall weighted average interest rates as a result of our financing activities. See Note 9 to the condensed consolidated financial statements for further discussion of our debt.

Fair Value Loss on Common Stock Warrant Liabilities: The fair value loss on common stock warrant liabilities was a $22.3 million loss for the three months ended September 30, 2020. The loss for the three months ended September 30, 2020 was primarily due to the change in estimated fair value of common stock warrant liabilities. At September 30, 2021, no 2015 Public or Private Warrants were outstanding, and as a result, there was no fair value loss on common stock warrant liabilities recorded for the three months ended September 30, 2021. At September 30, 2021, 6,525,736 2018 Warrants were outstanding and classified as a component of equity, therefore, we will not reflect a common stock warrant liability on our balance sheet or related income or expense from changes in fair value on our statement of operations in the future.

Loss on Extinguishment of Debt: During the three months ended September 30, 2020, as a result of the Merger and the related financing transactions, we recorded a loss on extinguishment of debt of $42.4 million. This loss was comprised of the redemption premium and write off of unamortized deferred financing costs associated with the following: (i) $15.2 million due to the redemption of the 2022 Secured Notes, (ii) $22.7 million due to the redemption of the 2023 Secured Notes, and (iii) $4.4 million associated with the 2017 ABL Facility.

Income Tax Expense: Income tax expense increased $73.3 million to an expense of $6.6 million for the three months ended September 30, 2021 compared to a benefit of $66.7 million for the three months ended September 30, 2020. The increase in expense was driven by pre-tax income increase for the three months ended September 30, 2021. Additionally, a $54.1 million tax benefit was recorded in three months ended September 30, 2020 due to the reversal of the Company's valuation allowance after the Merger.

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Nine Months Ended September 30, 2021 Compared to the Nine Months Ended September 30, 2020

Our condensed consolidated statements of operations for the nine months ended September 30, 2021 and 2020 are presented below. The below results only include Mobile Mini for the periods subsequent to the Merger:

	Nine Months Ended September 30,				2021 vs. 2020 $ Change
(in thousands)	2021		2020
Revenues:
Leasing and services revenue:
Leasing	$	1,022,237	$	678,577	$	343,660
Delivery and installation	274,883		187,404		87,479
Sales revenue:
New units	37,823		38,736		(913)
Rental units	42,034		25,281		16,753
Total revenues	1,376,977		929,998		446,979
Costs:
Costs of leasing and services:
Leasing	235,375		162,344		73,031
Delivery and installation	228,280		153,742		74,538
Costs of sales:
New units	25,660		25,469		191
Rental units	22,870		16,446		6,424
Depreciation of rental equipment	175,053		146,279		28,774
Gross profit	689,739		425,718		264,021
Expenses:
Selling, general and administrative	372,296		241,269		131,027
Transaction costs	1,147		63,241		(62,094)
Other depreciation and amortization	58,760		22,824		35,936
Lease impairment expense and other related charges	2,328		3,999		(1,671)
Restructuring costs	11,958		4,543		7,415
Currency losses, net	196		147		49
Other expense (income), net	207		(1,757)		1,964
Operating income	242,847		91,452		151,395
Interest expense	88,377		89,810		(1,433)
Fair value loss (gain) on common stock warrant liabilities	26,597		(46,063)		72,660
Loss on extinguishment of debt	5,999		42,401		(36,402)
Income before income tax	121,874		5,304		116,570
Income tax expense (benefit)	35,953		(66,170)		102,123
Net income	85,921		71,474		14,447
Net income attributable to non-controlling interest, net of tax	—		1,213		(1,213)
Net income attributable to WillScot Mobile Mini	$	85,921	$	70,261	$	15,660

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Comparison of Nine Months Ended September 30, 2021 and 2020

Revenue: Total revenue increased $447.0 million, or 48.1%, to $1,377.0 million for the nine months ended September 30, 2021 from $930.0 million for the nine months ended September 30, 2020. The increase was driven by the addition of Mobile Mini's revenues to our consolidated results for the full year, as well as by increased activity in the third quarter of 2021. The Merger closed on July 1, 2020, and the addition of Mobile Mini's results for the first and second quarter of 2021 drove a $330.8 million year over year increase. Leasing revenue increased $343.7 million, or 50.6%, as compared to the same period in 2020 driven by an increase of 109,542 average modular space and portable storage units on rent as a result of the Merger and increased economic activity, and improved pricing and value added products in our NA Modular segment. Delivery and installation revenues increased $87.5 million, or 46.7%, due to increased overall activity as a result of the Merger and increased activity in 2021. Rental unit sales increased $16.8 million, or 66.4%, and new unit sales decreased $0.9 million, or 2.3%.

Total average units on rent for the nine months ended September 30, 2021 and 2020 were 263,664 and 154,122, respectively. The increase was due to units acquired as part of the Merger, and increased units on rent year over year in the third quarter on portable storage units. In total, modular space average units on rent increased 14,779 units, or 15.5%, for the nine months ended September 30, 2021 as compared to the nine months ended September 30, 2020. Modular space average monthly rental rates increased 11.3% to $727 for the nine months ended September 30, 2021. Portable storage average units on rent increased by 94,763 units, or 161.5%, for the nine months ended September 30, 2021 driven by units acquired as part of the Merger and increased units on rent year over year in the third quarter. Average portable storage monthly rental rates increased 8.5% to $140 for the nine months ended September 30, 2021 driven by the accretive impact of higher rates from the Mobile Mini portable storage fleet and year over year increases during the third quarter. The average modular space unit utilization rate during the nine months ended September 30, 2021 was 70.2%, as compared to 69.8% during the same period in 2020. This increase was driven by higher utilization on units acquired as part of the Merger. The average portable storage unit utilization rate during the nine months ended September 30, 2021 was 78.7%, as compared to 71.3% during the same period in 2020. The increase in average portable storage utilization rate was driven by higher utilization on the acquired Mobile Mini units and continued improvement in portable storage utilization rates year over year in the third quarter.

Gross Profit: Our gross profit percentage was 50.1% and 45.8% for the nine months ended September 30, 2021 and 2020, respectively. Our gross profit percentage, excluding the effects of depreciation, was 62.8% and 61.5% for the nine months ended September 30, 2021 and 2020, respectively.

Gross profit increased $264.0 million, or 62.0%, to $689.7 million for the nine months ended September 30, 2021 from $425.7 million for the nine months ended September 30, 2020. The increase in gross profit is a result of a $270.6 million increase in leasing gross profit, increased delivery and installation gross profit of $12.9 million, and increased new and rental unit sale margins of $9.2 million. Increases in all were primarily a result of increased revenues due to the Merger and due to favorable average monthly rental rates on modular space and portable storage units, as well as favorable year over year volumes on portable storage units in the third quarter. Depreciation increased to $175.1 million as a result of fleet acquired in the Merger and capital investments made in our existing rental equipment.

SG&A: Selling, general and administrative ("SG&A") increased $131.0 million, or 54.3%, to $372.3 million for the nine months ended September 30, 2021, compared to $241.3 million for the nine months ended September 30, 2020. The primary driver of the increase is related to additional SG&A costs related to operating a larger business as a result of the Merger. The Merger closed on July 1, 2020, and SG&A costs included in Adjusted EBITDA for the NA Storage, UK Storage, and Tank and Pump segments in the first and second quarters of 2021 drove $89.9 million of the year over year increase. Additionally, as a result of the Merger and the related integration, integration costs increased $12.3 million to $23.2 million for the nine months ended September 30, 2021, compared to $10.9 million for the nine months ended September 30, 2020 and stock compensation expense increased $7.5 million to $14.5 million for the nine months ended September 30, 2021, compared to $7.0 million for the nine months ended September 30, 2020. The primary driver of the remaining increases are related to additional SG&A costs related to increased economic activity, including increased employee and occupancy costs, insurance costs, and increased travel and entertainment costs as travel reopened a bit more as compared to 2020.

Transaction Costs: Transaction costs decreased $62.1 million to $1.1 million for the nine months ended September 30, 2021 compared to $63.2 million for the nine months ended September 30, 2020. Transaction costs for the nine months ended September 30, 2020 were related to the Merger which closed on July 1, 2020.

Other Depreciation and Amortization: Other depreciation and amortization increased $36.0 million to $58.8 million for the nine months ended September 30, 2021 compared to $22.8 million for the nine months ended September 30, 2020 driven by increased depreciation and amortization as a result of property, plant and equipment and intangible assets acquired in the Merger and our recent investments in our enterprise resource planning system, and the amortization of the customer relationship intangible assets acquired in the Merger.

Lease Impairment Expense and Other Related Charges: Lease impairment expense and other related charges was $2.3 million for the nine months ended September 30, 2021 as compared to $4.0 million for the nine months ended September 30, 2020.

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Restructuring Costs: In the nine months ended September 30, 2021, the Company had $12.0 million of restructuring costs primarily as a result of employee termination costs from the elimination of positions due to the Merger. $7.2 million of the employee termination costs were settled in stock, which is non-cash and non-recurring and not included in stock compensation expense. In the nine months ended September 30, 2020, $4.5 million of restructuring costs were primarily due to employee termination costs as a result of the Merger and, to a lesser extent, reductions in force across our branch network in response to COVID-19 economic conditions.

Currency Losses, Net: Currency losses, net increased by $0.1 million to a $0.2 million loss for the nine months ended September 30, 2021 from a $0.1 million loss for the nine months ended September 30, 2020. This increase was primarily attributable to the impact of foreign currency exchanges rate changes on intercompany receivables and payables denominated in a currency other than the subsidiary's functional currency.

Other Expense (Income), Net: Other expense (income), net was $0.2 million of expense for the nine months ended September 30, 2021 compared to $1.8 million of income for the nine months ended September 30, 2020. Other income, net of $1.8 million for the nine months ended September 30, 2020 was primarily related to the reversal of a non-income tax liability of $2.5 million.

Interest Expense: Interest expense decreased $1.4 million to $88.4 million for the nine months ended September 30, 2021 from $89.8 million for the nine months ended September 30, 2020. The decrease in interest expense was a result of the lower overall weighted average interest rates as a result of our financing activities. See Note 9 to the condensed consolidated financial statements for further discussion of our debt.

Fair Value Loss (Gain) on Common Stock Warrant Liabilities: The fair value    loss (gain) on common stock warrant liabilities increased $72.7 million to a $26.6 million loss for the nine months ended September 30, 2021 from a $46.1 million gain for the nine months ended September 30, 2020. The increase was primarily due to the change in estimated fair value of common stock warrant liabilities. At September 30, 2021, no 2015 Public or Private Warrants remain outstanding. At September 30, 2021, 6,525,736 2018 Warrants were outstanding and classified as a component of equity, therefore, we will not reflect a common stock warrant liability on our balance sheet or related income or expense from changes in fair value on our statement of operations in the future.

Loss on Extinguishment of Debt: During the nine months ended September 30, 2021, we redeemed $123.5 million of the outstanding principal of our 2025 Secured Notes and recorded a loss on extinguishment of debt of $6.0 million comprised of a redemption premium of $3.7 million and write off of unamortized deferred financing fees of $2.3 million. As a result of the Merger and the related financing transactions, we recorded a loss on extinguishment of debt of $42.4 million in the nine months ended September 30, 2020. This loss on extinguishment of debt was comprised of the redemption premium and write off of unamortized deferred financing costs associated with the following: (i) $15.2 million due to the redemption of the 2022 Secured Notes, (ii) $22.7 million due to the redemption of the 2023 Secured Notes, and (iii) $4.4 million associated with the 2017 ABL Facility.

Income Tax Expense: Income tax expense increased $102.2 million to expense of $36.0 million for the nine months ended September 30, 2021 compared to a benefit of $66.2 million for the nine months ended September 30, 2020. The increase in expense was driven by pre-tax income increase for the nine months ended September 30, 2021. Additionally, a $56.8 million tax benefit was recorded in nine months ended September 30, 2020 due to the reversal of the Company's valuation allowance after the merger with Mobile Mini.

Business Segment Results

The Company operates in four reportable segments as follows: NA Modular, NA Storage, UK Storage and Tank and Pump. The NA Modular segment represents the activities of WillScot prior to the Merger. The NA Storage, UK Storage and Tank and Pump segments align to the three segments reported by Mobile Mini prior to the Merger. During the third quarter of 2021, the majority of the portable storage product business within the NA Modular segment was transitioned to the NA Storage segment, and associated revenues, expenses, and operating metrics beginning in the third quarter of 2021 were transferred to the NA Storage segment, representing a shift of approximately $5.0 million of revenue and gross margin per quarter from the NA Modular segment to the NA Storage segment. This adjustment was not made to the historical segment results of prior periods, given its relative immateriality.

The following tables and discussion summarize our reportable segment financial information for the three and nine months ended September 30, 2021 and 2020. The below results only include Mobile Mini for the periods subsequent to the Merger. A Summary Business Segment Supplemental Unaudited Pro Forma Financial Information section has been included in this MD&A in order to provide period over period comparable financial information for the NA Storage, UK Storage and Tank and Pump reporting segments as these segments were not included in our reported results for the first six months of 2020.

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Comparison of Three Months Ended September 30, 2021 and 2020

	Three Months Ended September 30, 2021
(in thousands, except for units on rent and rates)	NA Modular			NA Storage			UK Storage			Tank and Pump			Total
Revenue	$	299,051		$	133,897		$	28,099		$	29,505		$	490,552
Gross profit	$	127,854		$	92,496		$	18,876		$	14,323		$	253,549
Adjusted EBITDA	$	106,825		$	59,123		$	13,255		$	10,946		$	190,149
Capital expenditures for rental equipment	$	31,789		$	11,920		$	11,649		$	5,016		$	60,374
Average modular space units on rent	84,218			16,316			9,298			—			109,832
Average modular space utilization rate	67.6		%	77.6		%	83.4		%	—		%	70.1		%
Average modular space monthly rental rate	$	834		$	602		$	454		$	—		$	767
Average portable storage units on rent	493			137,123			25,632			—			163,248
Average portable storage utilization rate	48.0		%	83.2		%	89.1		%	—		%	83.9		%
Average portable storage monthly rental rate	$	179		$	155		$	90		$	—		$	145
Average tank and pump solutions rental fleet utilization based on original equipment cost	—		%	—		%	—		%	74.8		%	74.8		%

	Three Months Ended September 30, 2020
(in thousands, except for units on rent and rates)	NA Modular			NA Storage			UK Storage			Tank and Pump			Total
Revenue	$	267,867		$	104,493		$	21,653		$	23,302		$	417,315
Gross profit	$	112,079		$	73,384		$	12,671		$	11,430		$	209,564
Adjusted EBITDA	$	100,281		$	46,465		$	8,306		$	8,507		$	163,559
Capital expenditures for rental equipment	$	34,249		$	7,234		$	677		$	431		$	42,591
Average modular space units on rent	86,400			16,383			8,444			—			111,227
Average modular space utilization rate	68.3		%	80.4		%	79.1		%	—		%	70.6		%
Average modular space monthly rental rate	$	693		$	505		$	356		$	—		$	640
Average portable storage units on rent	15,473			105,221			23,146			—			143,840
Average portable storage utilization rate	61.3		%	73.4		%	83.2		%	—		%	73.2		%
Average portable storage monthly rental rate	$	124		$	145		$	75		$	—		$	131
Average tank and pump solutions rental fleet utilization based on original equipment cost	—		%	—		%	—		%	58.2		%	58.2		%

NA Modular

Revenue: Total revenue increased $31.2 million, or 11.6%, to $299.1 million for the three months ended September 30, 2021 from $267.9 million for the three months ended September 30, 2020. The increase was primarily the result of a $27.5 million, or 14.3%, increase in leasing revenue, and a $5.9 million, or 11.3% increase in modular delivery and installation revenue. The increases to leasing revenue and delivery and installation revenues were partially offset by declines in revenues for portable storage units as a result of transitioning the majority of the portable storage product business within the NA Modular segment to the NA Storage segment. Approximately 12,000 units were transferred during the third quarter to the NA Storage segment, reallocating approximately $5.0 million of revenue from NA Modular to NA Storage relative to the third quarter of 2020. The increases to leasing revenue and delivery and installation revenues were also partially offset by a decrease of $1.8 million, or 18.8%, in rental unit sales revenue and a $0.5 million, or 3.6%, decrease in new unit sales. Average modular space monthly rental rates increased 20.3% for the three months ended September 30, 2021 to $834 driven by the continuation of the long-term price optimization and VAPS penetration opportunities across our portfolio. Improved pricing was partially offset by lower volumes as average modular space units on rent decreased by 2,182 units, or 2.5%, year over year. The decrease was driven primarily by reduced demand for new project deliveries as a result of the COVID-19 pandemic primarily in the second and third quarter of 2020. Economic activity in 2021 has improved and sequentially from June 30, 2021, modular space units on rent increased approximately 700 units, or 0.8% during the third quarter.

Gross Profit: Gross profit increased $15.8 million, or 14.1%, to $127.9 million for the three months ended September 30, 2021 from $112.1 million for the three months ended September 30, 2020. The increase in gross profit was driven by higher leasing gross profit, which increased $17.7 million, or 12.4%, driven from improved pricing including VAPS, and partly offset by the reallocation of approximately $5.0 million of revenue and gross profit from NA Modular segment to the NA Storage segment relative to the third quarter of 2020. The increase in gross profit from leasing for the three months ended September

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30, 2021 was further complemented by a $1.1 million increase in rental unit sales gross profit. These increases were partially offset by a $1.3 million decrease in delivery and installation gross profit driven by higher fleet relocation expenses, a $1.1 million decrease in new sales gross profit, and a $0.6 million increase in depreciation of rental equipment related to capital investments made in our existing rental equipment.

Adjusted EBITDA: Adjusted EBITDA increased $6.5 million, or 6.5%, to $106.8 million for the three months ended September 30, 2021 from $100.3 million for the three months ended September 30, 2020. The increase was driven by higher leasing gross profit discussed above. SG&A, excluding discrete items, increased $7.6 million, or 12.9%, for the three months ended September 30, 2021, as compared to the three months ended September 30, 2020.

Capital Expenditures for Rental Equipment: Purchases of rental equipment and refurbishments decreased $2.4 million, or 7.0%, to $31.8 million for the three months ended September 30, 2021 from $34.2 million for the three months ended September 30, 2020.

NA Storage

Revenue: Total revenue increased $29.4 million, or 28.1%, to $133.9 million for the three months ended September 30, 2021 from $104.5 million for the three months ended September 30, 2020. Leasing revenues increased $24.2 million in the current quarter compared to the prior-year quarter. Modular space average units on rent decreased 0.4% and average modular space monthly rental rates increased 19.2% year-over-year driven primarily by increased pricing on new deliveries. Portable storage units on rent increased 30.3% driven by increased economic activity. NA Storage portable storage units on rent also increased as a result of the transitioning of the majority of the portable storage product business within the NA Modular segment to the NA Storage segment during the third quarter, which represented the transfer of approximately 12,000 units on rent. Combined, average portable storage units on rent for the NA Storage and NA Modular segments increased approximately 16,922 units, or 14.0%. Given the timing of acquisitions during the quarter, acquisition units did not have a material impact on average units on rent. Average portable storage monthly rental rates increased 6.9% year-over-year also as a result of increased pricing on new deliveries. Delivery and installation revenues increased $7.4 million year-over-year as delivery levels have increased as a result of economic recovery. Sales revenues decreased $2.2 million compared to the prior-year quarter.

Gross Profit: Gross profit increased by $19.1 million, or 26.0%, to $92.5 million for the three months ended September 30, 2021 compared to $73.4 million for the three months ended September 30, 2020. Gross profit on leasing activity increased by $18.9 million year-over-year driven both by increased volume and pricing as described above. For delivery and installation, gross profit increased $1.3 million. Sales gross profit decreased by $0.2 million to $2.1 million.

Adjusted EBITDA: Adjusted EBITDA increased $12.6 million, or 27.1%, to $59.1 million for the three months ended September 30, 2021 from $46.5 million for the three months ended September 30, 2020 and the margin contracted to 44.2% from 44.5% as a result of increased delivery activity. The increase in Adjusted EBITDA was driven primarily by increased leasing gross profit as described above, partially offset by increased SG&A. Excluding acquisition costs and stock-based compensation, SG&A increased $7.3 million in this segment. The increase was comprised of increased costs for personnel, including commissions and other variable compensation, travel, and computer costs.

Capital Expenditures for Rental Equipment: Purchases of rental equipment and refurbishments of $11.9 million were $4.7 million higher than the prior-year quarter driven by increased fleet investments for specific products, largely portable storage units and ground level offices, to grow units on rent as demand has recovered to pre-COVID-19 levels.

UK Storage

Revenue: Total revenue increased $6.4 million, or 29.5%, to $28.1 million for the three months ended September 30, 2021 from $21.7 million for the three months ended September 30, 2020. In local currency total revenues increased 21.7%. Leasing revenues increased $6.3 million in the current quarter compared to the prior-year quarter. Modular space average units on rent increased 10.1%, while portable storage units on rent increased 10.7%. Average monthly rental rates for modular space units and portable storage units increased 27.5% and 20.0% year-over-year, respectively, including the impacts of currency fluctuations. Delivery and installation revenues increased $0.9 million year-over-year. Sales revenues decreased $0.7 million compared to the prior-year quarter.

Gross Profit: Gross profit increased $6.2 million, or 49.2%, for the three months ended September 30, 2021 to $18.9 million from $12.7 million for the three months ended September 30, 2020. In local currency, gross profit increased 39.7%. This increase was driven by a significant increase in fleet utilization coupled with strong rental rate growth and strategic cost management.

Adjusted EBITDA: Adjusted EBITDA increased $5.0 million, or 60.0%, to $13.3 million for three months ended September 30, 2021 from $8.3 million for the three months ended September 30, 2020 and the margin expanded to 47.2% from 38.4%. The increase results primarily from the favorable gross profit discussed above, partially offset by increased SG&A of $1.2 million driven by increased costs for personnel, including commissions and other variable compensation.

Capital Expenditures for Rental Equipment: Purchases of rental equipment and refurbishments of $11.6 million were driving the $10.9 million increase compared to the prior-year quarter. These investments were made to fulfill increasing demand and to drive increased units on rent and utilization.

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Tank & Pump

Revenue: Total revenue increased $6.2 million, or 26.6%, to $29.5 million for the three months ended September 30, 2021 from $23.3 million for the three months ended September 30, 2020. These increases were driven by increased average original rental cost ("OEC") rental fleet utilization, which increased 1660 bps to 74.8% for the three months ended September 30, 2021 from 58.2% for the three months ended September 30, 2020. 2020 results beginning in the second quarter especially were significantly impacted by lower mid- and down-stream oil and gas activity, petrochemical refining activity and specifically the lower demand for jet fuel resulting from COVID-19.

Gross Profit: Gross profit increased $2.9 million, or 25.4%, for the three months ended September 30, 2021 to $14.3 million from $11.4 million for the three months ended September 30, 2020. This increase was driven by increased gross profit for leasing activity, which increased $3.5 million driven by the increased revenue as discussed above.

Adjusted EBITDA: Adjusted EBITDA increased $2.5 million, or 29.8%, to $11.0 million for the three months ended September 30, 2021 from $8.5 million for the three months ended September 30, 2020 and the margin expanded to 37.1% from 36.5%. The increase in Adjusted EBITDA was driven by the increased gross profit discussed above, partially offset by a $0.6 million increase in SG&A expense driven primarily by increased personnel costs.

Capital Expenditures for Rental Equipment: Current quarter expenditures of $5.0 million were $4.6 million higher than the prior-year quarter as we began to increase investment in additional rental equipment to fund increasing fleet utilization.

Comparison of the Nine Months Ended September 30, 2021 and 2020

	Nine Months Ended September 30, 2021
(in thousands, except for units on rent and rates)	NA Modular			NA Storage			UK Storage			Tank and Pump					Total
Revenue	$	854,657		$	357,439		$	83,538		$	81,343				$	1,376,977
Gross profit	$	356,992		$	240,836		$	53,306		$	38,605				$	689,739
Adjusted EBITDA	$	307,741		$	154,971		$	36,647		$	29,870				$	529,229
Capital expenditures for rental equipment	$	120,288		$	24,165		$	22,645		$	11,093		$	—	$	178,191
Average modular space units on rent	84,589			16,371			9,256			—					110,216
Average modular space utilization rate	67.6		%	78.5		%	83.8		%	—		%			70.2		%
Average modular space monthly rental rate	$	790		$	570		$	428		$	—				$	727
Average portable storage units on rent	9,566			118,598			25,284			—					153,448
Average portable storage utilization rate	64.1		%	78.0		%	90.0		%	—		%			78.7		%
Average portable storage monthly rental rate	$	129		$	152		$	86		$	—				$	140
Average tank and pump solutions rental fleet utilization based on original equipment cost	—		%	—		%	—		%	71.2		%			71.2		%

	Nine Months Ended September 30, 2020
(in thousands, except for units on rent and rates)	NA Modular			NA Storage			UK Storage			Tank and Pump			Total
Revenue	$	780,550		$	104,493		$	21,653		$	23,302		$	929,998
Gross profit	$	328,233		$	73,384		$	12,671		$	11,430		$	425,718
Adjusted EBITDA	$	287,345		$	46,465		$	8,306		$	8,507		$	350,623
Capital expenditures for rental equipment	$	113,931		$	7,234		$	677		$	431		$	122,273
Average modular space units on rent	87,161			5,461			2,815			—			95,437
Average modular space utilization rate	68.7		%	80.4		%	79.1		%	—		%	69.8		%
Average modular space monthly rental rate	$	672		$	505		$	356		$	—		$	653
Average portable storage units on rent	15,896			35,074			7,715			—			58,685
Average portable storage utilization rate	62.6		%	73.4		%	83.2		%	—		%	71.3		%
Average portable storage monthly rental rate	$	121		$	145		$	75		$	—		$	129
Average tank and pump solutions rental fleet utilization based on original equipment cost	—		%	—		%	—		%	58.2		%	58.2		%

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NA Modular

Revenue: Total revenue increased $74.1 million, or 9.5%, to $854.7 million for the nine months ended September 30, 2021 from $780.6 million for the nine months ended September 30, 2020. The increase was primarily the result of a $66.3 million, or 11.6%, increase in leasing revenue, a $6.6 million, or 4.3% increase in delivery and installation revenues, and a $6.7 million, or 31.0%, increase in rental unit sales revenue. The increases to leasing revenue and delivery and installation revenues were partially offset by declines in revenues for portable storage units as the result of transitioning the majority of the portable storage product business within the NA Modular segment to the NA Storage segment during the third quarter of 2021. Approximately 12,000 units were transferred during the third quarter to the NA Storage segment, reallocating approximately $5.0 million of revenue from NA Modular segment to the NA Storage segment relative to the first nine months of 2020. Average modular space monthly rental rates increased 17.6% for the nine months ended September 30, 2021 to $790 driven by the continuation of the long-term price optimization and VAPS penetration opportunities across our portfolio. Improved pricing was partially offset by lower volumes as average modular space units on rent decreased by 2,572 units, or 3.0%, year over year. The decrease was driven primarily by lower deliveries, including reduced demand for new project deliveries as a result of the COVID-19 pandemic primarily in the second and third quarters of 2020.

Gross Profit: Gross profit increased $28.8 million, or 8.8%, to $357.0 million for the nine months ended September 30, 2021 from $328.2 million for the nine months ended September 30, 2020. The increase in gross profit was driven by higher leasing gross profit, which increased $41.3 million, or 9.7%, driven from improved pricing including VAPS, and partly offset by the reallocation of $5.0 million of revenue and gross profit from NA Modular segment to NA Storage segment relative to the first nine months of 2020. The increase in gross profit from leasing for the nine months ended September 30, 2021 was further complemented by a $6.1 million increase in rental unit sales gross profit. These increases were partially offset by a $9.0 million decrease in delivery and installation gross profit driven by higher fleet relocation expenses, a $2.9 million decrease in new sales gross profit, and a $6.7 million increase in depreciation of rental equipment related to capital investments made in our existing rental equipment.

Adjusted EBITDA: Adjusted EBITDA increased $20.4 million, or 7.1%, to $307.7 million for the nine months ended September 30, 2021 from $287.3 million for the nine months ended September 30, 2020. The increase was driven by higher leasing gross profit discussed above. SG&A, excluding discrete items, increased $11.5 million, or 6.4%, for the nine months ended September 30, 2021, as compared to the September 30, 2020 primarily driven by employee and occupancy costs.

Capital Expenditures for Rental Equipment: Purchases of rental equipment and refurbishments increased $6.4 million, or 5.6%, to $120.3 million for the nine months ended September 30, 2021 from $113.9 million for the nine months ended September 30, 2020.

Other Non-GAAP Financial Data and Reconciliations

We use certain non-GAAP financial information that we believe is important for purposes of comparison to prior periods and development of future projections and earnings growth prospects. This information is also used by management to measure the profitability of our ongoing operations and analyze our business performance and trends.

We evaluate business segment performance on Adjusted EBITDA, a non-GAAP measure that excludes certain items as described in the reconciliation of our consolidated net income (loss) to Adjusted EBITDA reconciliation below. We believe that evaluating segment performance excluding such items is meaningful because it provides insight with respect to the intrinsic operating results of the Company.

We also regularly evaluate gross profit by segment to assist in the assessment of the operational performance of each operating segment. We consider Adjusted EBITDA to be the more important metric because it more fully captures the business performance of the segments, inclusive of indirect costs.

Adjusted EBITDA

We define EBITDA as net income (loss) plus interest expense, income tax expense (benefit), depreciation and amortization. Our adjusted EBITDA ("Adjusted EBITDA") reflects the following further adjustments to EBITDA to exclude certain non-cash items and the effect of what we consider transactions or events not related to our core business operations:

•Currency (gains) losses, net: on monetary assets and liabilities denominated in foreign currencies other than the subsidiaries’ functional currency. Substantially all such currency gains (losses) are unrealized and attributable to financings due to and from affiliated companies.

•Goodwill and other impairment charges related to non-cash costs associated with impairment charges to goodwill, other intangibles, rental fleet and property, plant and equipment.

•Restructuring costs, lease impairment expense, and other related charges associated with restructuring plans designed to streamline operations and reduce costs including employee and lease termination costs.

•Transaction costs including legal and professional fees and other transaction specific related costs.

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•Costs to integrate acquired companies, including outside professional fees, non-capitalized costs associated with system integrations, non-lease branch and fleet relocation expenses, employee training costs and other costs required to realize cost or revenue synergies.

•Non-cash charges for stock compensation plans.

•Gains and losses resulting from changes in fair value and extinguishment of common stock warrant liabilities.

•Other expense includes consulting expenses related to certain one-time projects, financing costs not classified as interest expense and gains and losses on disposals of property, plant and equipment.

Adjusted EBITDA has limitations as an analytical tool, and you should not consider the measure in isolation or as a substitute for net income (loss), cash flow from operations or other methods of analyzing WillScot Mobile Mini’s results as reported under GAAP. Some of these limitations are:

•Adjusted EBITDA does not reflect changes in, or cash requirements for our working capital needs;

•Adjusted EBITDA does not reflect our interest expense, or the cash requirements necessary to service interest or principal payments, on our indebtedness;

•Adjusted EBITDA does not reflect our tax expense or the cash requirements to pay our taxes;

•Adjusted EBITDA does not reflect historical cash expenditures or future requirements for capital expenditures or contractual commitments;

•Adjusted EBITDA does not reflect the impact on earnings or changes resulting from matters that we consider not to be indicative of our future operations;

•although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future and Adjusted EBITDA does not reflect any cash requirements for such replacements; and

•other companies in our industry may calculate Adjusted EBITDA differently, limiting its usefulness as a comparative measure.

Because of these limitations, Adjusted EBITDA should not be considered as discretionary cash available to reinvest in the growth of our business or as measures of cash that will be available to meet our obligations.

The following table provides an unaudited reconciliation of Net income (loss) to Adjusted EBITDA:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands)	2021		2020		2021		2020
Net income (loss)	$	61,103	$	(6,051)	$	85,921	$	71,474
Income tax expense (benefit)	6,644		(66,675)		35,953		(66,170)
Loss on extinguishment of debt	—		42,401		5,999		42,401
Fair value loss (gain) on common stock warrant liabilities	—		22,303		26,597		(46,063)
Interest expense	29,201		33,034		88,377		89,810
Depreciation and amortization	75,276		71,704		233,813		169,103
Currency losses (gains), net	127		(371)		196		147
Restructuring costs, lease impairment expense and other related charges	2,457		4,798		14,286		8,542
Transaction costs	303		52,191		1,147		63,241
Integration costs	8,247		7,083		23,211		10,921
Stock compensation expense	6,259		2,944		14,480		6,958
Other	532		198		(751)		259
Adjusted EBITDA	$	190,149	$	163,559	$	529,229	$	350,623

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Net Income Excluding Gain/Loss from Warrants

We define Net Income Excluding Gain/Loss from Warrants as net income plus or minus the impact of the change in the fair value of the common stock warrant liability. Management believes that our financial statements that include the impact of this mark-to-market expense or income may not be necessarily reflective of the actual operating performance of our business.

The following table provides an unaudited reconciliation of Net income (loss) to Net Income (Loss) Excluding Gain/Loss from Warrants:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Net income (loss)	$	61,103	$	(6,051)	$	85,921	$	71,474
Fair value loss (gain) on common stock warrant liabilities	—		22,303		26,597		(46,063)
Net Income (Loss) Excluding Gain/Loss from Warrants	$	61,103	$	16,252	$	112,518	$	25,411

Adjusted Gross Profit and Adjusted Gross Profit Percentage

We define Adjusted Gross Profit as gross profit plus depreciation on rental equipment. Adjusted Gross Profit Percentage is defined as Adjusted Gross Profit divided by revenue. Adjusted Gross Profit and Adjusted Gross Profit Percentage are not measurements of our financial performance under GAAP and should not be considered as an alternative to gross profit, gross profit percentage, or other performance measures derived in accordance with GAAP. In addition, our measurement of Adjusted Gross Profit and Adjusted Gross Profit Percentage may not be comparable to similarly titled measures of other companies. Management believes that the presentation of Adjusted Gross Profit and Adjusted Gross Profit Percentage provides useful information to investors regarding our results of operations because it assists in analyzing the performance of our business.

The following table provides an unaudited reconciliation of gross profit to Adjusted Gross Profit and Adjusted Gross Profit Percentage:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(in thousands)	2021			2020			2021			2020
Revenue (A)	$	490,552		$	417,315		$	1,376,977		$	929,998
Gross profit (B)	$	253,549		$	209,564		$	689,739		$	425,718
Depreciation of rental equipment	56,462			54,837			175,053			146,279
Adjusted Gross Profit (C)	$	310,011		$	264,401		$	864,792		$	571,997
Gross Profit Percentage (B/A)	51.7		%	50.2		%	50.1		%	45.8		%
Adjusted Gross Profit Percentage (C/A)	63.2		%	63.4		%	62.8		%	61.5		%

Net CAPEX

We define Net CAPEX as purchases of rental equipment and refurbishments and purchases of property, plant and equipment (collectively, "Total Capital Expenditures"), less proceeds from the sale of rental equipment and proceeds from the sale of property, plant and equipment (collectively, "Total Proceeds"), which are all included in cash flows from investing activities. Management believes that the presentation of Net CAPEX provides useful information to investors regarding the net capital invested into our rental fleet and plant, property and equipment each year to assist in analyzing the performance of our business.

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The following table provides an unaudited reconciliation of Net CAPEX:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands)	2021		2020		2021		2020
Total purchases of rental equipment and refurbishments	$	(60,374)	$	(42,591)	$	(178,191)	$	(122,273)
Total proceeds from sale of rental equipment	11,597		13,179		42,034		25,281
Net CAPEX for Rental Equipment	(48,777)		(29,412)		(136,157)		(96,992)
Purchase of property, plant and equipment	(3,386)		(5,893)		(20,836)		(9,079)
Proceeds from sale of property, plant and equipment	209		1,982		16,647		5,825
Net CAPEX	$	(51,954)	$	(33,323)	$	(140,346)	$	(100,246)

Summary Business Segment Supplemental Pro Forma Financial Information

As a result of the Merger and the significant financing transactions, we believe presenting supplemental pro forma financial information is beneficial to the readers of the financial statements. For the three months ended September 30, 2021 and 2020 there are no differences between pro forma results and actual results on a reported basis. Please see comparison of results for the three months ended September 30, 2021 and 2020 within "Business Segment Results" above. The following tables set forth key metrics for the nine months ended September 30, 2021 and 2020 used by management to run the business on a pro forma basis as if the Merger and financing transactions had occurred on January 1, 2019. Refer to the Supplemental Pro Forma Financial Information section below for the full reconciliation of the statements of operations.

The Company operates in four reportable segments as follows: NA Modular, NA Storage, UK Storage and Tank and Pump. The NA Modular segment represents the activities of WillScot prior to the Merger. The NA Storage, UK Storage, and Tank and Pump segments align to the three segments reported by Mobile Mini prior to the Merger. These reporting segments are aligned with how we operate and analyze our business results. During the third quarter of 2021, the majority of the portable storage product business within the NA Modular segment was transitioned to the NA Storage segment, and associated revenues, expenses, and operating metrics beginning in the third quarter of 2021 were transferred to the NA Storage segment.

Comparison of Nine Months Ended September 30, 2021 and 2020

	Pro Forma Combined Nine Months Ended September 30,				2021 vs. 2020
(in thousands)	2021		2020		$ Change		% Change
Revenue	$	1,376,977	$	1,214,238	$	162,739	13.4	%
Selling, general and administrative expenses	$	372,296	$	337,439	$	34,857	10.3	%
Net income	$	85,921	$	116,678	$	(30,757)	(26.4)	%
Net income excluding gain/loss from warrants	$	112,518	$	70,615	$	27,025	8.0	%
Adjusted EBITDA	$	529,229	$	466,781	$	62,448	13.4	%
Other Financial Data:
Adjusted EBITDA - NA Modular	$	307,741	$	287,345	$	20,396	7.1	%
Adjusted EBITDA - NA Storage	154,971		131,229		23,742		18.1	%
Adjusted EBITDA - UK Storage	36,647		21,564		15,083		69.9	%
Adjusted EBITDA - Tank and Pump	29,870		26,643		3,227		12.1	%
Consolidated Adjusted EBITDA(a)	$	529,229	$	466,781	$	62,448	13.4	%

(a) We present Adjusted EBITDA, a measurement not calculated in accordance with GAAP, because it is a key metric used by management to assess financial performance.

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NA Modular - Quarterly Results

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2021:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	266,224		$	289,382		$	299,051		$	854,657
Gross profit	$	113,002		$	115,136		$	127,854		$	356,992
Adjusted EBITDA	$	97,371		$	103,545		$	106,825		$	307,741
Capital expenditures for rental equipment	$	39,135		$	49,364		$	31,789		$	120,288
Average modular space units on rent	84,795			84,754			84,218			84,589
Average modular space utilization rate	67.6		%	67.7		%	67.6		%	67.6		%
Average modular space monthly rental rate	$	737		$	801		$	834		$	790
Average portable storage units on rent	14,903			13,301			493			9,566
Average portable storage utilization rate	60.3		%	69.8		%	48.0		%	64.1		%
Average portable storage monthly rental rate	$	124		$	133		$	179		$	129

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2020:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	255,821		$	256,862		$	267,867		$	780,550
Gross profit	$	106,190		$	109,964		$	112,079		$	328,233
Adjusted EBITDA	$	89,544		$	97,520		$	100,281		$	287,345
Capital expenditures for rental equipment	$	39,648		$	40,034		$	34,249		$	113,931
Average modular space units on rent	87,988			87,096			86,400			87,161
Average modular space utilization rate	69.2		%	68.5		%	68.3		%	68.7		%
Average modular space monthly rental rate	$	653		$	669		$	693		$	672
Average portable storage units on rent	16,346			15,869			15,473			15,896
Average portable storage utilization rate	64.1		%	62.5		%	61.3		%	62.6		%
Average portable storage monthly rental rate	$	119		$	120		$	124		$	121

The NA Modular segment represents the activities of WillScot prior to the Merger. As a result, there are no differences between pro forma results and actual results on a reported basis. Please see comparison of results for the three months ended September 30, 2021 and 2020 and the nine months ended September 30, 2021 and 2020 within "Business Segment Results" above.

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NA Storage - Quarterly Results

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2021:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	107,748		$	115,794		$	133,897		$	357,439
Gross profit	$	72,619		$	75,721		$	92,496		$	240,836
Adjusted EBITDA	$	46,322		$	49,526		$	59,123		$	154,971
Capital expenditures for rental equipment	$	3,472		$	8,773		$	11,920		$	24,165
Average modular space units on rent	16,439			16,360			16,316			16,371
Average modular space utilization rate	79.4		%	78.4		%	77.6		%	78.5		%
Average modular space monthly rental rate	$	535		$	573		$	602		$	570
Average portable storage units on rent	105,810			112,862			137,123			118,598
Average portable storage utilization rate	73.9		%	76.1		%	83.2		%	78.0		%
Average portable storage monthly rental rate	$	148		$	151		$	155		$	152

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2020:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	103,495		$	92,826		$	104,493		$	300,814
Gross profit	$	71,400		$	66,639		$	73,384		$	211,423
Adjusted EBITDA	$	43,994		$	40,770		$	46,465		$	131,229
Capital expenditures for rental equipment	$	5,200		$	7,272		$	7,234		$	19,706
Average modular space units on rent	15,509			15,757			16,383			15,883
Average modular space utilization rate	77.8		%	78.6		%	80.4		%	78.9		%
Average modular space monthly rental rate	$	497		$	463		$	505		$	488
Average portable storage units on rent	105,441			101,463			105,221			104,042
Average portable storage utilization rate	73.1		%	70.6		%	73.4		%	72.4		%
Average portable storage monthly rental rate	$	146		$	143		$145			$145

Comparison of Nine Months Ended September 30, 2021 and 2020

NA Storage

Revenue: Total revenue increased $56.6 million, or 18.8%, to $357.4 million for the nine months ended September 30, 2021 from $300.8 million for the nine months ended September 30, 2020. Leasing revenues increased $42.6 million compared to the prior year. Modular space average units on rent increased 3.1% and average modular space monthly rental rates increased 16.8% year-over-year driven primarily by increased pricing on new deliveries. Portable storage units on rent increased 14.0% and average portable storage monthly rental rates increased 4.8% year-over-year also driven primarily by increased pricing on new deliveries. Delivery and installation revenues increased $14.0 million year-over-year as delivery levels in the third quarter have increased as a result of increased demand. Sales revenues remained flat at $16.7 million, compared to prior-year.

Gross Profit: Gross profit increased by $29.4 million, or 13.9%, to $240.8 million for the nine months ended September 30, 2021 compared to $211.4 million compared to the nine months ended September 30, 2020. Gross profit on leasing activity increased by $31.2 million year-over-year driven both by increased volume and pricing as described above. For delivery and installation, gross profit increased $1.3 million. Sales gross profit increased by $0.8 million to $6.9 million.

Adjusted EBITDA: Adjusted EBITDA increased $23.7 million, or 18.1%, to $155.0 million for the nine months ended September 30, 2021 from $131.2 million for the nine months ended September 30, 2020 and the margin contracted to 43.4% from 43.6%. The increase in Adjusted EBITDA was driven primarily by increased leasing gross profit as described above, partially offset by increased SG&A. Excluding acquisition costs and stock-based compensation, SG&A increased $9.5 million in this segment. The increase was comprised of increased costs for personnel, including commissions and other variable compensation, insurance, computer costs, and bad debt expenses.

Capital Expenditures for Rental Equipment: Purchases of rental equipment and refurbishments of $24.2 million for the nine months ended September 30, 2021 were $4.5 million lower than for the nine months ended September 30, 2020.

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Rental fleet expenditures in the first quarter were significantly below 2020 levels in response to COVID-19-related demand reductions, but as economic activity has recovered, we have begun to invest to meet demand for specific products, largely portable storage units and ground level offices.

UK Storage - Quarterly Results

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2021:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	27,007		$	28,432		$	28,099		$	83,538
Gross profit	$	16,493		$	17,937		$	18,876		$	53,306
Adjusted EBITDA	$	11,064		$	12,328		$	13,255		$	36,647
Capital expenditures for rental equipment	$	6,770		$	4,226		$	11,649		$	22,645
Average modular space units on rent	9,115			9,354			9,298			9,256
Average modular space utilization rate	83.8		%	84.3		%	83.4		%	83.8		%
Average modular space monthly rental rate	$	404		$	438		$	454		$	428
Average portable storage units on rent	24,647			25,573			25,632			25,284
Average portable storage utilization rate	89.2		%	91.8		%	89.1		%	90.0		%
Average portable storage monthly rental rate	$	82		$	88		$	90		$	86

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2020:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	20,197		$	17,154		$	21,653		$	59,004
Gross profit	$	11,372		$	10,991		$	12,671		$	35,034
Adjusted EBITDA	$	6,405		$	6,853		$	8,306		$	21,564
Capital expenditures for rental equipment	$	337		$	522		$	677		$	1,536
Average modular space units on rent	7,850			7,912			8,444			8,069
Average modular space utilization rate	74.2		%	74.6		%	79.1		%	76.0		%
Average modular space monthly rental rate	$	326		$	313		$	356		$	332
Average portable storage units on rent	23,328			22,870			23,146			23,115
Average portable storage utilization rate	83.7		%	82.2		%	83.2		%	83.0		%
Average portable storage monthly rental rate	$	73		$	70		$	75		$	73

Comparison of Nine Months Ended September 30, 2021 and 2020

UK Storage

Revenue: Total revenue increased $24.5 million, or 41.5%, to $83.5 million for the nine months ended September 30, 2021 from $59.0 million for the nine months ended September 30, 2020. In local currency total revenues increased 30.2%. Leasing revenues increased $18.9 million in the current quarter compared to the prior-year quarter. Modular space average units on rent increased 14.7%, while portable storage units on rent increased 9.4%. Monthly rental rates for modular space units and portable storage units increased 28.9% and 17.8% year-over-year, respectively, including the impacts of currency fluctuations.

Gross Profit: Gross profit increased $18.3 million, or 52.3%, for the nine months ended September 30, 2021 to $53.3 million from $35.0 million for the nine months ended September 30, 2020. In local currency, gross profit increased 39.7%. This increase was driven by a significant increase in fleet utilization coupled with strong rental rate growth and strategic cost management.

Adjusted EBITDA: Adjusted EBITDA increased $15.0 million, or 69.2%, to $36.6 million for nine months ended September 30, 2021 from $21.6 million for the nine months ended September 30, 2020 and the margin expanded to 43.9% from 36.5%. The increase results primarily from the favorable gross profit discussed above, partially offset by increased SG&A of $3.7 million driven by increased costs for personnel, including commissions and other variable compensation.

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Capital Expenditures for Rental Equipment: Purchases of rental equipment and refurbishments of $22.6 million were driving the $21.1 million increase compared to the prior year. These investments were made to fulfill increasing demand and to drive increased units on rent and utilization.

Tank and Pump - Quarterly Results

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2021:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	24,344		$	27,494		$	29,505		$	81,343
Gross profit	$	11,266		$	13,016		$	14,323		$	38,605
Adjusted EBITDA	$	8,828		$	10,096		$	10,946		$	29,870
Capital expenditures for rental equipment	$	3,158		$	2,919		$	5,016		$	11,093
Average tank and pump solutions rental fleet utilization based on original equipment cost	67.4		%	71.2		%	74.8		%	71.2		%

Pro Forma Quarterly Results for the Nine Months Ended September 30, 2020:

(in thousands, except for units on rent and monthly rental rate)	Q1			Q2			Q3			Total
Revenue	$	26,884		$	23,684		$	23,302		$	73,870
Gross profit	$	13,279		$	11,723		$	11,430		$	36,432
Adjusted EBITDA	$	9,477		$	8,659		$	8,507		$	26,643
Capital expenditures for rental equipment	$	4,514		$	941		$	431		$	5,886
Average tank and pump solutions rental fleet utilization based on original equipment cost	66.4		%	60.5		%	58.2		%	61.7		%

Comparison of Nine Months Ended September 30, 2021 and 2020

Tank & Pump

Revenue: Total revenue increased $7.4 million, or 10.0%, to $81.3 million for the nine months ended September 30, 2021 from $73.9 million for the nine months ended September 30, 2020. These increases were driven by increased average OEC rental fleet utilization, which increased 950 bps to 71.2% for the nine months ended September 30, 2021 from 61.7% for the nine months ended September 30, 2020. 2020 results beginning in the second quarter especially were significantly impacted by lower mid- and down-stream oil and gas activity, petrochemical refining activity and specifically the lower demand for jet fuel resulting from COVID-19.

Gross Profit: Gross profit increased $2.2 million, or 6.0%, for the nine months ended September 30, 2021 to $38.6 million from $36.4 million for the nine months ended September 30, 2020. Gross profit for leasing activity increased by $3.5 million compared to the prior year, however gross profit for delivery and installation activity decreased $0.9 million and gross profit for sales activity decreased $0.4 million.

Adjusted EBITDA: Adjusted EBITDA increased $3.3 million, or 12.4%, to $29.9 million for the nine months ended September 30, 2021 from $26.6 million for the nine months ended September 30, 2020 and the margin improved to 36.7% from 36.1%. The increase in Adjusted EBITDA was primarily driven from favorable gross profit discussed above and by a $1.0 million reduction in SG&A expense.

Capital Expenditures for Rental Equipment: Year to date expenditures of $11.1 million were $5.2 million higher than the prior year as we began to increase investment in additional rental equipment to fund increasing fleet utilization.

Liquidity and Capital Resources

Overview

WillScot Mobile Mini is a holding company that derives its operating cash flow from its operating subsidiaries. Our principal sources of liquidity include cash generated by operating activities from our subsidiaries, borrowings under the 2020 ABL Facility, and sales of equity and debt securities. We believe that our liquidity sources and operating cash flows are sufficient to address our operating, debt service and capital requirements over the next twelve months.

We have been consistently engaged in both the debt and equity capital markets both opportunistically and as necessary to support the growth of our business, desired leverage levels, and other capital allocation priorities. Subsequent to

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the Merger, we believe we have ample liquidity in the 2020 ABL Facility and are generating substantial free cash flow, which together support both organic operations and other capital allocation priorities as they arise.

We continue to review available acquisition opportunities with the awareness that any such acquisition may require us to incur additional debt to finance the acquisition and/or to issue shares of our Common Stock or other equity securities as acquisition consideration or as part of an overall financing plan. In addition, we will continue to evaluate alternatives to optimize our capital structure, which could include the issuance or repurchase of additional unsecured and secured debt, equity securities and/or equity-linked securities. There can be no assurance as to the timing of any such issuance or repurchase. If we obtain additional capital by issuing equity, the interests of our existing stockholders will be diluted. If we incur additional indebtedness, that indebtedness may contain significant financial and other covenants that may significantly restrict our operations. Availability of financing and the associated terms are inherently dependent on the debt and equity capital markets and subject to change. From time to time we may also seek to streamline our capital structure and improve our financial position through refinancing or restructuring our existing debt or retiring certain of our securities for cash or other consideration.

On July 1, 2020, in connection with the completion of the Merger, Holdings, WSII, and certain of its subsidiaries, entered into a new asset-based credit agreement, that provides for revolving credit facilities in the aggregate principal amount of up to $2.4 billion, consisting of: (i) a senior secured asset-based US dollar revolving credit facility in the aggregate principal amount of $2.0 billion (the “US Facility”), available to WSII and certain of its subsidiaries (collectively, the “US Borrowers”), and (ii) a $400.0 million senior secured asset-based multicurrency revolving credit facility (the "Multicurrency Facility") together with the US Facility (collectively, the “2020 ABL Facility”), available to be drawn in US Dollars, Canadian Dollars, British Pounds Sterling or Euros by the US Borrowers, and certain of WSII’s wholly-owned subsidiaries organized in Canada and in the United Kingdom. Borrowing availability under the 2020 ABL Facility is equal to the lesser of $2.4 billion and the applicable borrowing bases. The borrowing bases are a function of, among other things, the value of the assets in the relevant collateral pool. At September 30, 2021, we had $831.6 million of available borrowing capacity under the 2020 ABL Facility.

COVID-19 Impact on Liquidity

We continue to monitor the impact that the global pandemic is having on our financial operations and liquidity; however, to date this impact has been immaterial, and we see the adverse impacts of COVID-19 diminishing as the global economy recovers. We regularly manage all aspects of our business including, but not limited to, monitoring the financial health of our customers, suppliers and other third-party relationships, actively managing our cost structure, reducing or delaying capital spending, and developing new opportunities for growth. We believe that the actions we have taken in recent years to increase our scale and competitive position and strengthen our balance sheet positioned us well to manage through economic cycles and have positioned us well for the current recovery.

Cash Flow Comparison of the Nine Months Ended September 30, 2021 and 2020

Significant factors driving our liquidity position include cash flows generated from operating activities and capital expenditures. Our ability to fund our capital needs will be affected by our ongoing ability to generate cash from operations and access to capital markets.

The following summarizes our change in cash and cash equivalents for the periods presented:

	Nine Months Ended September 30,
(in thousands)	2021		2020
Net cash from operating activities	$	392,055	$	175,095
Net cash from investing activities	(196,590)		(83,073)
Net cash from financing activities	(208,935)		(75,612)
Effect of exchange rate changes on cash and cash equivalents	(150)		542
Net change in cash and cash equivalents	$	(13,620)	$	16,952

Cash Flows from Operating Activities

Cash provided by operating activities for the nine months ended September 30, 2021 was $392.1 million as compared to $175.1 million for the nine months ended September 30, 2020, an increase of $217.0 million. The increase was due to an increase of $213.0 million of net income, adjusted for non-cash items, and an increase of $4.0 million in the net movements of the operating assets and liabilities.

Cash Flows from Investing Activities

Cash used in investing activities for the nine months ended September 30, 2021 was $196.6 million as compared to $83.1 million for the nine months ended September 30, 2020, an increase of $113.5 million. The increase in cash used in investing activities was driven by a $73.4 million increase in cash used in the acquisition of businesses, net of cash acquired, a $55.9 million increase in cash used for the purchase of rental equipment and refurbishments, and a $11.7 million increase in cash used for the purchase of property, plant and equipment. These increases were partially offset by a $16.7 million increase

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in proceeds from the sale of rental equipment and a $10.8 million increase in proceeds from sale of property, plant and equipment.

Cash Flows from Financing Activities

Cash used in financing activities for the nine months ended September 30, 2021 was $208.9 million as compared to $75.6 million for the nine months ended September 30, 2020, an increase of $133.3 million. The increase is primarily due to $320.6 million paid in 2021 to repurchase common stock and warrants as well as a decrease of $2,184.7 million in receipts from borrowing, partially offset by a decrease of $2,291.5 million in repayment of borrowings and a decrease of $64.6 million in payment of financing costs.

Free Cash Flow

Free Cash Flow is a non-GAAP measure. We define Free Cash Flow as net cash provided by operating activities, less purchases of, and proceeds from, rental equipment and property, plant and equipment, which are all included in cash flows from investing activities. Management believes that the presentation of Free Cash Flow provides useful additional information concerning cash flow available to fund our capital allocation alternatives. The following table provides a reconciliation of net cash provided by operating activities to Free Cash Flow.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Net cash provided by operating activities	$	130,447	$	61,368	$	392,055	$	175,095
Purchase of rental equipment and refurbishments	(60,374)		(42,591)		(178,191)		(122,273)
Proceeds from sale of rental equipment	11,597		13,179		42,034		25,281
Purchase of property, plant and equipment	(3,386)		(5,893)		(20,836)		(9,079)
Proceeds from the sale of property, plant and equipment	209		1,982		16,647		5,825
Free Cash Flow	$	78,493	$	28,045	$	251,709	$	74,849

Free Cash Flow for the nine months ended September 30, 2021 was an inflow of $251.7 million as compared to an inflow of $74.8 million for the nine months ended September 30, 2020, an increase in Free Cash Flow of $176.9 million. Free Cash Flow increased year over year principally as a result of the $217.0 million increase in cash provided by operating activities and partially offset by the $55.9 million increase in cash used in the purchase of rental equipment and refurbishments. The $130.4 million in cash provided by operating activities for the three months ended September 30, 2021 was returned to shareholders through stock and warrant repurchases and cancellations and reinvested into the business to support the purchase of rental equipment, including VAPS, and refurbishments.

Contractual Obligations

The following table presents information relating to our contractual obligations and commercial commitments as of September 30, 2021:

(in thousands)	Total		Less than 1 year		Between 1 to 3 years		Between 3 to 5 years		More than 5 years
Long-term indebtedness, including current portion and interest (a)(b)	$	3,068,439	$	106,545	$	203,826	$	2,199,390	$	558,678
Payroll tax withholding (c)	10,350		5,175		5,175		—		—
Operating lease liabilities	276,332		61,275		94,591		61,382		59,084
Total	$	3,355,121	$	172,995	$	303,592	$	2,260,772	$	617,762

(a)	Long-term indebtedness includes borrowings and interest under the 2020 ABL Facility, the 2025 Senior Secured Notes, the 2028 Senior Secured Notes, and finance leases.
(b)	Includes the obligations under our interest rate swap agreement that effectively convert $400 million in aggregate notional amount of variable-rate debt under the Company’s ABL Facility into fixed-rate debt. The future obligations under the interest rate swaps was calculated using the 1-month LIBOR rate as of September 30, 2021.
(c)	Amounts relate to the opportunistic election to delay payment of employer payroll taxes on an interest-free basis in accordance with the Coronavirus Aid, Relief, and Economic Security Act of 2020 (the ‘‘CARES Act’’).

At September 30, 2021, in addition to the above contractual obligations, the Company has an estimated $2.7 million of potential long-term tax liabilities, including interest and penalties related to uncertain tax positions. Because of the high degree of uncertainty regarding the future cash flows associated with these potential long-term tax liabilities, the Company is unable to estimate the years in which settlement will occur with the respective taxing authorities.

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Off-Balance Sheet Arrangements

We have no off-balance sheet arrangements that have or are reasonably likely to have a current or future material effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.

Supplemental Pro Forma Information

The following pro forma financial information has been prepared for WillScot Mobile Mini for the nine months ended September 30, 2020. These pro forma condensed combined statements of operations present the historical consolidated statements of operations of WillScot Mobile Mini, giving effect to the following items as if they had occurred on January 1, 2019:

(i)the Merger with Mobile Mini;

(ii)borrowings under the Company’s 2025 Secured Notes and the 2020 ABL Facility;

(iii)extinguishment of the Mobile Mini line of credit and senior notes assumed in the Merger and subsequently repaid;

(iv)repayment of the 2017 ABL Facility and the 2022 Senior Notes repaid contemporaneously with the Merger;

(v)the transaction costs incurred in connection with the Merger; and

(vi)elimination of non-controlling interest in connection with the Sapphire Exchange as contemplated by the Merger.

The adjustments presented on the pro forma financial statements have been identified and presented to provide relevant information necessary for an accurate understanding of the combined company following the transactions and events described above. The pro forma financial information set forth below is based upon available information and assumptions that we believe are reasonable and is for illustrative purposes only. The financial results may have been different if the transactions described above had actually been completed sooner. You should not rely on the pro forma financial information as being indicative of the historical results that would have been achieved if these transactions and events had been completed as of January 1, 2019. The pro forma combined financial information below should be read in conjunction with the condensed consolidated financial statements and related notes of the Company included elsewhere in this Form 10-Q. All pro forma adjustments and their underlying assumptions are described more fully in the notes below.

Accounting Policies

During the preparation of these pro forma condensed combined financial statements, we assessed whether there were any material differences between the Company’s accounting policies and Mobile Mini’s accounting policies. The assessment performed did not identify any material differences and, as such, these pro forma condensed combined financial statements do not adjust for or assume any differences in accounting policies between WillScot and Mobile Mini.

Pro forma Presentation

The following pro forma condensed combined financial information and associated notes are based on the historical financial statements of WillScot and Mobile Mini as described below. In preparing the pro forma condensed combined statements of operations for the nine months ended September 30, 2020, certain historical financial information for Mobile Mini was reclassified to align to the reporting classifications of WillScot.

The pro forma condensed combined statement of operations for the nine months ended September 30, 2020 are based on, derived from, and should be read in conjunction with, WillScot’s historical financial statements. The aforementioned pro forma financial statements are also based on, derived from, and should be read in conjunction with Mobile Mini’s historical financial statements.

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	Nine Months Ended September 30, 2020
(in thousands)	Historical WillScot		Historical Mobile Mini (as reclassified)		Pro Forma Adjustments		Pro Forma Condensed Combined
Revenues:
Leasing and services revenue:
Leasing	$	678,577	$	208,374	$	—	$	886,951
Delivery and installation	187,404		59,999		—		247,403
Sales revenue:
New units	38,736		8,402		—		47,138
Rental units	25,281		7,465		—		32,746
Total revenues	929,998		284,240		—		1,214,238
Costs:
Costs of leasing and services:
Leasing	162,344		28,584		—		190,928
Delivery and installation	153,742		42,476		—		196,218
Costs of sales:
New units	25,469		5,457		—		30,926
Rental units	16,446		4,625		—		21,071
Depreciation of rental equipment	146,279		15,360		2,334		163,973		(b)
Gross profit	425,718		187,738		(2,334)		611,122
Expenses:
Selling, general and administrative	304,510		112,969		(80,040)		337,439		(a)
Other depreciation and amortization	22,824		19,695		11,397		53,916		(c)
Lease impairment expense and other related charges	3,999		—		—		3,999
Restructuring costs	4,543		—		—		4,543
Currency losses, net	147		39		—		186
Other (income) expense, net	(1,757)		186		—		(1,571)
Operating income	91,452		54,849		66,309		212,610
Interest expense	89,810		16,974		(9,808)		96,976		(d)
Fair value gain on common stock warrant liabilities	(46,063)		—		—		(46,063)
Loss on extinguishment of debt	42,401		—		(19,682)		22,719		(e)
Income before income tax	5,304		37,875		95,799		138,978
Income tax (benefit) expense	(66,170)		12,330		76,140		22,300		(f)
Net income	71,474		25,545		19,659		116,678
Net income attributable to non-controlling interest, net of tax	1,213		—		(1,213)		—		(g)
Net income attributable to WillScot Mobile Mini	$	70,261	$	25,545	$	20,872	$	116,678

60

Notes to Pro Forma Statements

(a)	Represents the elimination of non-recurring transaction costs incurred as a result of the Mobile Mini Merger.
(b)	Represents the adjustment for depreciation of rental fleet relating to the estimated increase in fair value purchase accounting adjustments as a result of the Merger.
(c)	Represents the differential in other depreciation and amortization expense related to the fair value purchase accounting adjustments as a result of the Merger.
(d)	Reflects the adjustment for interest expense related to our debt structure after the Merger as though the following had occurred on January 1, 2019 (i) borrowings under the 2020 ABL Facility, (ii) borrowings under the 2025 Secured Notes, (iii) repayment of the 2017 ABL Facility, (iv) repayment of the 2022 Secured Notes and repayment of the Mobile Mini debt assumed at the Merger.
(e)	Represents the elimination of the one-time loss on extinguishment of debt in connection with the repayment of the 2022 Secured Notes and the 2017 ABL Facility.
(f)	Reflects the adjustment to recognize the income tax impacts of the unaudited pro forma adjustments for which a tax expense is recognized using a U.S. federal and state statutory tax rate of 25.5%. This rate may vary from the effective tax rates of the historical and combined businesses. In addition, the three and nine months ended September 30, 2020 included adjustments of $54.1 million and $56.8 million, respectively, to eliminate the reversal of valuation allowance as a result of reassessment of the realizability of deferred tax assets as a result of the Merger.
(g)	Reflects the adjustment for the extinguishment of non-controlling interest as a result of the Sapphire Exchange on June 30, 2020.

The pro forma adjustment to interest expense consists of the following:

	Nine Months Ended September 30, 2020
(in thousands)
ABL Facility interest	$	(2,561)
2022 Secured Notes interest	(10,631)
2025 Secured Notes interest	18,247
Mobile Mini debt interest	(15,921)
Deferred financing fee amortization	1,058
Net pro forma adjustment	$	(9,808)

Reconciliation of Pro Forma Adjusted EBITDA

The following unaudited table provides a reconciliation of Net income to pro forma unaudited adjusted EBITDA:

	Nine Months Ended September 30, 2020
(in thousands)
Net income	$	116,678
Income tax expense	22,300
Loss on extinguishment of debt	22,719
Fair value gain on common stock warrant liabilities	(46,063)
Interest expense	96,976
Depreciation and amortization	217,889
Currency losses, net	186
Restructuring costs, lease impairment expense, other related charges	8,542
Integration costs	10,921
Stock compensation expense	12,359
Other	4,274
Adjusted EBITDA	$	466,781

61

Reconciliation of Pro Forma Net Income Excluding Gain/Loss from Warrants

The following unaudited table provides a reconciliation of Net income to pro forma unaudited net income excluding gain/loss from warrants:

	Nine Months Ended September 30,
(in thousands)		2020
Net income		$	116,678
Fair value gain on common stock warrant liabilities		(46,063)
Net income excluding gain/loss from warrants		$	70,615

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition, results of operations, liquidity and capital resources is based on our condensed consolidated financial statements, which have been prepared in accordance with GAAP. GAAP requires that we make estimates and judgments that affect the reported amount of assets, liabilities, revenue, expenses and the related disclosure of contingent assets and liabilities. We base these estimates on historical experience and on various other assumptions that we consider reasonable under the circumstances, and reevaluate our estimates and judgments as appropriate. The actual results experienced by us may differ materially and adversely from our estimates.

The US Securities and Exchange Commission (the “SEC”) suggests companies provide additional disclosure on those accounting policies considered most critical. The SEC considers an accounting policy to be critical if it is important to our financial condition and results of operations and requires significant judgments and estimates on the part of management in its application. For a complete discussion of our significant critical accounting policies, see the “Critical Accounting Policies and Estimates” section in Part II, Item 7 of our Annual Report on Form 10-K/A for the year ended December 31, 2020 (the "2020 Annual Report on Form 10-K/A").

There were no significant changes to our critical accounting policies during the nine months ended September 30, 2021.

Recently Issued Accounting Standards

Refer to Part I, Item 1, Note 1 of the notes to our financial statements included in this Quarterly Report on Form 10-Q for our assessment of recently issued and adopted accounting standards.

Cautionary Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the US Private Securities Litigation Reform Act of 1995 and Section 21E of the Securities Act of 1934, as amended. The words “estimates,” “expects,” “anticipates,” “believes,” “forecasts,” “plans,” “intends,” “may,” “will,” “should,” “shall,” “outlook,” “guidance” and variations of these words and similar expressions identify forward-looking statements, which are generally not historical in nature and relate to expectations for future financial performance or business strategies or objectives.

Forward-looking statements are subject to a number of risks, uncertainties, assumptions and other important factors, many of which are outside our control, which could cause actual results or outcomes to differ materially from those discussed in the forward-looking statements. Although WillScot Mobile Mini believes that these forward-looking statements are based on reasonable assumptions, it can give no assurance that any such forward-looking statement will materialize.

Important factors that may affect actual results or outcomes include, among others:

•our ability to successfully acquire and integrate new operations, including Mobile Mini and our conversion to its enterprise resource planning system, and to realize anticipated synergies from the Merger with Mobile Mini;

•operational, economic, political and regulatory risks;

•the effect of global or local economic conditions in the industries and markets in which the Company operates and any changes therein, including financial market conditions and levels of end market demand;

•the impact of the global pandemic related to COVID-19, including the financial condition of the Company’s customers and suppliers and employee health and safety;

•risks associated with cybersecurity and IT systems disruptions, including our ability to manage the business in the event a disaster shuts down our management information systems;

•effective management of our rental equipment;

•trade policies and changes in trade policies, including the imposition of tariffs, their enforcement and downstream consequences;

•our ability to effectively compete in the modular space, portable storage and tank and pump industries;

62

•our ability to effectively manage our credit risk, collect on our accounts receivable, and recover our rental equipment;

•our ability to effectively launch operations into new geographic markets and/or add other business unit operations in existing markets;

•the effect of changes in state building codes on our ability to remarket our buildings;

•foreign currency exchange rate exposure;

•fluctuations in interest rates and commodity prices;

•significant increases in raw material and labor costs;

•fluctuations in fuel costs or oil prices, a reduction in fuel supplies, or a sustained decline in oil prices;

•our reliance on third party manufacturers and suppliers;

•risks associated with labor relations, labor costs and labor disruptions;

•failure to retain key personnel;

•impairment of our goodwill, intangible assets and indefinite-life intangible assets;

•our ability to use our net operating loss carryforwards and other tax attributes;

•our ability to recognize deferred tax assets such as those related to our tax loss carryforwards and, as a result, utilize future tax savings;

•unanticipated changes in our tax obligations, the adoption of a new tax legislation, or exposure to additional income tax liabilities;

•various laws and regulations, including those governing government contracts, corruption and the environment;

•changes in the competitive environment of our customer base as a result of the global, national or local economic climate in which they operate and/or economic or financial disruptions to their industry;

•risks associated with operational measures designed to increase revenue while continuing to control operating costs;

•our ability to adequately protect our intellectual property and other proprietary rights that are material to our business;

•natural disasters and other business disruptions such as pandemics, fires, floods, hurricanes, earthquakes and terrorism;

•property, casualty or other losses not covered by our insurance;

•our ability to redeploy our units effectively should a significant number of our leased units be returned during a short period of time;

•our ability to close our unit sales transactions;

•fluctuations in the fair value of common stock warrant liabilities;

•our ability to maintain an effective system of internal controls and accurately report our financial results and remediate material weaknesses;

•public company requirements that may strain our resources and divert management's attention;

•our ability to manage growth and execute our business plan;

•changes in the supply and price of new and used products we lease;

•unanticipated threats including market entry by a new competitor;

•rising costs adversely affecting our profitability; and

•such other risks and uncertainties described in the periodic reports we file with the SEC from time to time (including our 2020 Annual Report on Form 10-K/A), which are available through the SEC’s EDGAR system at www.sec.gov and on our website.

Any forward-looking statement speaks only at the date which it is made, and WillScot Mobile Mini undertakes no obligation, and disclaims any obligation, to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

63

ITEM 3.    Quantitative and Qualitative Disclosures about Market Risk

We are exposed to certain market risks from changes in foreign currency exchange rates and interest rates. Changes in these factors cause fluctuations in our earnings and cash flows. We evaluate and manage exposure to these market risks as follows:

Interest Rate Risk

We are primarily exposed to interest rate risk through our ABL Facility, which bears interest at variable rates based on LIBOR. We had $1.6 billion in outstanding principal under the ABL Facility at September 30, 2021.

In order to manage this risk, on November 6, 2018, WSII entered into an interest rate swap agreement that effectively converts $400.0 million in aggregate notional amount of variable-rate debt under our ABL Facility into fixed-rate debt. The swap agreement provides for WillScot Mobile Mini to pay a fixed rate of 3.06% per annum on the outstanding debt in exchange for receiving a variable interest rate based on 1-month LIBOR. The effect is a synthetically fixed rate of 4.92% on the $400.0 million notional amount, when including the current applicable margin.

An increase in interest rates by 100 basis points on our ABL Facility, inclusive of the impact of our interest rate swaps, would increase our quarter to date interest expense by approximately $2.7 million based on current outstanding borrowings.

Foreign Currency Risk

We currently generate the majority of our consolidated net revenues in the US, and the reporting currency for our consolidated financial statements is the US dollar. However, we are exposed to currency risk principally through our operations in Canada and the United Kingdom. For the operations outside the US we bill customers primarily in their local currency, which is subject to foreign currency rate changes. As our net revenues and expenses generated outside of the US increase, our results of operations could be adversely impacted by changes in foreign currency exchange rates. Since we recognize foreign revenues in local foreign currencies, if the US dollar strengthens, it could have a negative impact on our foreign revenues upon translation of those results into the US dollar for consolidation into our financial statements.

In addition, we are exposed to gains and losses resulting from fluctuations in foreign currency exchange rates on transactions generated by our foreign subsidiaries in currencies other than their local currencies. These gains and losses are primarily driven by intercompany transactions and rental equipment purchases denominated in currencies other than the functional currency of the purchasing entity. These exposures are included in currency (gains) losses, net, on the condensed consolidated statements of operations. To date, we have not entered into any hedging arrangements with respect to foreign currency risk.

ITEM 4.    Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 as amended (the "Exchange Act"), as of September 30, 2021. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of September 30, 2021.

Changes in Internal Controls

During the second quarter of 2021, our legacy WillScot business began using the enterprise resource planning system (“ERP”) utilized by the legacy Mobile Mini business. We believe that consolidation of our operations into a single ERP will improve the overall system of internal controls over financial reporting, enable us to standardize processes across our business and facilitate the realization of cost savings. We completed the system conversion in the second quarter of 2021, and as a result, modified certain internal controls over financial reporting. During the third quarter of 2021, certain internal control processes were updated to reflect the ERP implementation.

Other than the item discussed above, there were no changes in our internal control over financial reporting that occurred during our quarter ended September 30, 2021 that materially affected or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II

ITEM 1.    Legal Proceedings

The Company is involved in various lawsuits, claims and legal proceedings that arise in the ordinary course of business. The Company assesses these matters on a case-by-case basis as they arise and establishes reserves as required. As of September 30, 2021, with respect to these outstanding matters, the Company believes that the amount or range of reasonably possible loss will not, either individually or in the aggregate, have a material adverse effect on the consolidated financial position, results of operations, or cash flows. However, the outcome of such matters is inherently unpredictable and subject to significant uncertainties.

ITEM 1A.    Risk Factors

The Company’s financial position, results of operations and cash flows are subject to various risks, many of which are not exclusively within the Company’s control, which may cause actual performance to differ materially from historical or projected future performance. In addition to the other information set forth in this report, you should carefully consider the risk factors discussed in Item 1A. of our 2020 Annual Report on Form 10-K/A, which have not materially changed, except as noted below.

Government imposed COVID-19 vaccine mandates could adversely affect our ability to retain and attract employees which could have a material adverse impact on our business and results of operations.

On November 4, 2021, the Occupational Safety and Health Administration (“OSHA”) issued an Emergency Temporary Standard (“ETS”) requiring that all employers with at least 100 employees ensure that their U.S.-based employees are fully vaccinated for COVID-19 or obtain a negative COVID-19 test at least once a week. As a company with more than 100 employees, we would be required to mandate COVID-19 vaccination of our workforce or require our unvaccinated employees to be tested on a weekly basis. Although this ETS takes effect immediately, it also serves as a proposal under Section 6(b) of the Occupational Safety and Health Act for a final standard. It remains unclear, among other things, if the final OSHA standard will apply to all employees or only to employees who work in an office, and how compliance will be documented. President Biden also issued an Executive Order requiring certain COVID-19 precautions for U.S. Government contractors and their subcontractors, which would include us, including mandatory employee vaccination (subject to medical and religious exemptions). It is not currently possible to predict with any certainty the exact impact on the Company of the OSHA ETS or the requirements for U.S. Government contractors and their subcontractors.

The requirement to mandate COVID-19 vaccination of our workforce or require our unvaccinated employees to be tested weekly could result in employee attrition and difficulty securing future labor needs, which could adversely affect our business, financial condition or results of operations.

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ITEM 2.    Unregistered Sales of Equity Securities

The following table summarizes our purchase of Common Stock during the third quarter of 2021:

Period	Total Number of Shares and Equivalents Purchased (in millions)	Average Price Paid per Share		Total Number of Shares and Equivalents Purchased as part of Publicly Announced Plan (in millions)	Maximum Dollar Value of Shares and Equivalents that May Yet Be Purchased Under the Plans (in millions)
July 1, 2021 to July 31, 2021	1.0	$	27.54	1.0	$	220.2
August 1, 2021 to August 31, 2021	0.1	$	25.43	0.1	$	218.3
September 1, 2021 to September 30, 2021	2.7	$	28.59	2.7	$	142.2
Total	3.8	$	28.24	3.8

On August 7, 2020, the Company's Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $250.0 million of its outstanding shares of Common Stock and equivalents. On April 29, 2021, the Company's Board of Directors approved an increase to the authorized amount under the stock repurchase program that authorizes the Company to repurchase up to $500.0 million of its outstanding shares of Common Stock and equivalents. The stock repurchase program does not obligate the Company to purchase any particular number of shares, and the timing and exact amount of any repurchases will depend on various factors, including market pricing and conditions, business, legal, accounting, and other considerations. As of September 30, 2021, $142.2 million remained of the $500.0 million share repurchase authorization. In October of 2021, the Company's Board of Directors replaced the existing share repurchase program with a new share repurchase program that authorizes the Company to repurchase up to $1.0 billion of its outstanding shares of Common Stock and equivalents.

ITEM 3.    Defaults Upon Senior Securities

None.

ITEM 4.    Mine Safety Disclosures

Not applicable.

ITEM 5.    Other Information

None.

66

ITEM 6.    Exhibits

Exhibit No.		Exhibit Description
31.1	*	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	*	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	**	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	**	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS		XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH		XBRL Taxonomy Extension Schema Document
101.CAL		XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF		XBRL Taxonomy Extension Definition Linkbase Document
101.LAB		XBRL Taxonomy Extension Label Linkbase Document
101.PRE		XBRL Taxonomy Extension Presentation Linkbase Document

*Filed herewith

**Furnished (and not filed) herewith pursuant to Item 601(b)(32)(ii) of Regulation S-K under the Exchange Act

67

Signature

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		WillScot Mobile Mini Holdings Corp.
		By:	/s/ CHRISTOPHER J. MINER
Dated:	November 5, 2021		Christopher J. Miner
			Executive Vice President & Chief Legal Officer

68

EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Bradley L. Soultz, certify that:

1. I have reviewed this quarterly report on Form 10-Q of WillScot Mobile Mini Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 5, 2021

/s/ BRADLEY L. SOULTZ

Bradley L. Soultz

Chief Executive Officer and Director (Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Timothy D. Boswell, certify that:

1. I have reviewed this quarterly report on Form 10-Q of WillScot Mobile Mini Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 5, 2021

/s/ TIMOTHY D. BOSWELL

Timothy D. Boswell

President and Chief Financial Officer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer

Pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of WillScot Mobile Mini Corp. (the “Company”) hereby certifies, to such officer's knowledge, that:

(i) the quarterly report on Form 10-Q of the Company for the period ended September 30, 2021 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 

Date: November 5, 2021

/s/ BRADLEY L. SOULTZ

Bradley L. Soultz

Chief Executive Officer and Director (Principal Executive Officer)

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to WillScot Mobile Mini Corporation and will be retained by WillScot Mobile Mini Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification of Chief Financial Officer

Pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of WillScot Mobile Mini Corp. (the “Company”) hereby certifies, to such officer's knowledge, that:

(i) the quarterly report on Form 10-Q of the Company for the period ended September 30, 2021 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 

Date: November 5, 2021

/s/ TIMOTHY D. BOSWELL

Timothy D. Boswell

President and Chief Financial Officer (Principal Financial Officer)

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to WillScot Mobile Mini Corporation and will be retained by WillScot Mobile Mini Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 01, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-37552
Entity Registrant Name	WILLSCOT MOBILE MINI HOLDINGS CORP.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-3430194
Entity Address, Address Line One	4646 E Van Buren St.
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Phoenix
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85008
City Area Code	480
Local Phone Number	894-6311
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		223,153,746
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001647088
Current Fiscal Year End Date	--12-31
Common Stock, par value $0.0001 per share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	WSC
Security Exchange Name	NASDAQ
Warrants to purchase Common Stock
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase Common Stock(1)
Trading Symbol	WSCTW

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 11,317	$ 24,937
Trade receivables, net of allowances for credit losses at September 30, 2021 and December 31, 2020 of $41,867 and $29,258, respectively	398,350	330,942
Inventories	30,943	23,731
Prepaid expenses and other current assets	35,940	29,954
Assets held for sale	962	12,004
Total current assets	477,512	421,568
Rental equipment, net	2,968,895	2,931,646
Property, plant and equipment, net	307,253	303,650
Operating lease assets	233,800	232,094
Goodwill	1,178,290	1,171,219
Intangible assets, net	467,289	495,947
Other non-current assets	11,142	16,081
Total long-term assets	5,166,669	5,150,637
Total assets	5,644,181	5,572,205
Liabilities and equity
Accounts payable	145,320	106,926
Accrued expenses	163,339	141,672
Deferred revenue and customer deposits	163,977	135,485
Operating lease liabilities - current	50,552	48,063
Current portion of long-term debt	18,652	16,521
Total current liabilities	541,840	448,667
Long-term debt	2,598,300	2,453,809
Deferred tax liabilities	346,687	307,541
Operating lease liabilities - non-current	183,035	183,761
Common stock warrant liabilities	0	77,404
Other non-current liabilities	17,735	37,150
Long-term liabilities	3,145,757	3,059,665
Total liabilities	3,687,597	3,508,332
Commitments and contingencies (see Note 17)
Preferred Stock: $0.0001 par, 1,000,000 shares authorized and zero shares issued and outstanding at September 30, 2021 and December 31, 2020	0	0
Common Stock: $0.0001 par, 500,000,000 shares authorized and 223,665,627 and 229,038,158 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	23	23
Additional paid-in-capital	3,655,587	3,852,291
Accumulated other comprehensive loss	(33,713)	(37,207)
Accumulated deficit	(1,665,313)	(1,751,234)
Total shareholders' equity	1,956,584	2,063,873
Total liabilities and equity	$ 5,644,181	$ 5,572,205

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Trade receivables, net of allowance	$ 41,867	$ 29,258
Preferred stock par value (in USD per share)	$ 0.0001	$ 0.0001
Preferred stock authorized (in shares)	1,000,000	1,000,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Common stock par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	500,000,000	500,000,000
Common stock issued (in shares)	223,665,627	229,038,158
Common stock outstanding (in shares)	223,665,627	229,038,158

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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Leasing	$ 363,396	$ 300,082	$ 1,022,237	$ 678,577
Total revenues	490,552	417,315	1,376,977	929,998
Costs:
Leasing	82,448	64,788	235,375	162,344
Depreciation of rental equipment	56,462	54,837	175,053	146,279
Gross profit	253,549	209,564	689,739	425,718
Expenses:
Selling, general and administrative	133,424	112,079	372,296	241,269
Transaction costs	303	52,191	1,147	63,241
Other depreciation and amortization	18,814	16,867	58,760	22,824
Lease impairment expense and other related charges	601	944	2,328	3,999
Restructuring costs	1,856	3,854	11,958	4,543
Currency losses (gains), net	127	(371)	196	147
Other expense (income), net	1,476	(1,012)	207	(1,757)
Operating income	96,948	25,012	242,847	91,452
Interest expense	29,201	33,034	88,377	89,810
Fair value loss (gain) on common stock warrant liabilities	0	22,303	26,597	(46,063)
Loss on extinguishment of debt	0	42,401	5,999	42,401
Income (loss) before income tax	67,747	(72,726)	121,874	5,304
Income tax expense (benefit)	6,644	(66,675)	35,953	(66,170)
Net income (loss)	61,103	(6,051)	85,921	71,474
Net income attributable to non-controlling interest, net of tax	0	0	0	1,213
Net income (loss) attributable to WillScot Mobile Mini	$ 61,103	$ (6,051)	$ 85,921	$ 70,261
Earnings (loss) per share attributable to WillScot Mobile Mini common shareholders
Basic (in USD per share)	$ 0.27	$ (0.03)	$ 0.38	$ 0.47
Diluted (in USD per share)	$ 0.26	$ (0.03)	$ 0.37	$ 0.15
Weighted average shares:
Basic (in shares)	225,998,202	226,649,993	227,557,664	149,283,083
Diluted (in shares)	231,868,397	226,649,993	234,084,800	152,432,945
Delivery and installation
Revenues:
Revenues	$ 99,699	$ 84,694	$ 274,883	$ 187,404
Costs:
Cost of sales	80,991	66,354	228,280	153,742
New units
Revenues:
Revenues	15,860	19,360	37,823	38,736
Total revenues	15,860	19,360	37,823	38,736
Costs:
Cost of sales	11,499	12,935	25,660	25,469
Rental units
Revenues:
Revenues	11,597	13,179	42,034	25,281
Total revenues	11,597	13,179	42,034	25,281
Costs:
Cost of sales	$ 5,603	$ 8,837	$ 22,870	$ 16,446

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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 61,103	$ (6,051)	$ 85,921	$ 71,474
Other comprehensive income (loss):
Foreign currency translation adjustment, net of income tax expense of $0 and $60 for the three and nine months ended September 30, 2021, respectively, and $0 for the three and nine months ended September 30, 2020	(11,162)	14,619	(3,035)	1,457
Net gain (loss) on derivatives, net of income tax expense (benefit) of $676 and $(1,183) for the three months ended September 30, 2021 and 2020, respectively, and $1,999 and $(1,183) for the nine months ended September 30, 2021 and 2020, respectively	2,206	3,905	6,529	(3,878)
Total other comprehensive income (loss)	(8,956)	18,524	3,494	(2,421)
Comprehensive income	52,147	12,473	89,415	69,053
Comprehensive loss attributable to non-controlling interest	0	0	0	(672)
Total comprehensive income attributable to WillScot Mobile Mini	$ 52,147	$ 12,473	$ 89,415	$ 69,725

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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, income tax expense	$ 0	$ 0	$ 60	$ 0
Net gain (loss) on derivatives, net of income tax expense (benefit)	$ 676	$ (1,183)	$ 1,999	$ (1,183)

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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total Shareholders' Equity	Non-Controlling Interest	Class A Common Stock Common Stock		Class B Common Stock Common Stock
Beginning balance (in shares) at Dec. 31, 2019									108,819,000	[1]	8,024,000
Beginning balance at Dec. 31, 2019		$ 555,199		$ 2,378,733	$ (62,775)	$ (1,825,361)	$ 490,609	$ 64,590	$ 11	[1]	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		91,655				91,785	91,785	(130)
Other comprehensive income (loss)		(29,902)			(27,199)		(27,199)	(2,703)
Stock-based compensation and issuance of Common Stock from vesting (in shares)	[1]								239,000
Stock-based compensation and issuance of Common Stock from vesting		1,787		1,787			1,787
Issuance of Common Stock from the exercise of options and warrants (in shares)	[1]								1,497,000
Issuance of Common Stock from the exercise of warrants		28,958		28,958			28,958
Withholding taxes on net share settlement of stock-based compensation		(673)		(673)			(673)
Ending balance (in shares) at Mar. 31, 2020									110,555,000	[1]	8,024,000
Ending Balance at Mar. 31, 2020		647,024		2,408,805	(89,974)	(1,733,576)	585,267	61,757	$ 11	[1]	$ 1
Beginning balance (in shares) at Dec. 31, 2019									108,819,000	[1]	8,024,000
Beginning balance at Dec. 31, 2019		555,199		2,378,733	(62,775)	(1,825,361)	490,609	64,590	$ 11	[1]	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		71,474
Other comprehensive income (loss)		(2,421)
Ending balance (in shares) at Sep. 30, 2020									227,981,000	[1]	0
Ending Balance at Sep. 30, 2020		2,037,780		3,859,140	(66,283)	(1,755,100)	2,037,780	0	$ 23	[1]	$ 0
Beginning balance (in shares) at Mar. 31, 2020									110,555,000	[1]	8,024,000
Beginning balance at Mar. 31, 2020		647,024		2,408,805	(89,974)	(1,733,576)	585,267	61,757	$ 11	[1]	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(14,130)				(15,473)	(15,473)	1,343
Other comprehensive income (loss)		8,957			8,139		8,139	818
Reclassification of ModSpace Warrants		26,216		26,216			26,216
Stock-based compensation and issuance of Common Stock from vesting		2,227		2,227			2,227
Sapphire Exchange (in shares)									10,641,000	[1]	(8,024,000)
Sapphire Exchange		0		66,890	(2,972)		63,918	(63,918)	$ 1	[1]	$ (1)
Issuance of Common Stock from the exercise of options and warrants (in shares)	[1]								37,000
Issuance of Common Stock from the exercise of warrants		374		374			374
Ending balance (in shares) at Jun. 30, 2020									121,233,000	[1]	0
Ending Balance at Jun. 30, 2020		670,668		2,504,512	(84,807)	(1,749,049)	670,668	0	$ 12	[1]	$ 0
Beginning balance (in shares) at Jun. 30, 2020									121,233,000	[1]	0
Beginning balance at Jun. 30, 2020		670,668		2,504,512	(84,807)	(1,749,049)	670,668	0	$ 12	[1]	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(6,051)				(6,051)	(6,051)
Other comprehensive income (loss)		18,524			18,524		18,524
Mobile Mini Merger (in shares)	[1]								106,427,000
Mobile Mini Merger		1,348,581		1,348,570			1,348,581		$ 11	[1]
Stock-based compensation and issuance of Common Stock from vesting (in shares)	[1]								321,000
Stock-based compensation		6,058		6,058			6,058
Ending balance (in shares) at Sep. 30, 2020									227,981,000	[1]	0
Ending Balance at Sep. 30, 2020		$ 2,037,780		3,859,140	(66,283)	(1,755,100)	2,037,780	$ 0	$ 23	[1]	$ 0
Beginning balance (in shares) at Dec. 31, 2020		229,038,158	229,038,000
Beginning balance at Dec. 31, 2020		$ 2,063,873	$ 23	3,852,291	(37,207)	(1,751,234)	2,063,873
Beginning balance at Dec. 31, 2020					(37,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						4,447	4,447
Other comprehensive income (loss)					7,211		7,211
Stock-based compensation and issuance of Common Stock from vesting (in shares)			229,000
Stock-based compensation and issuance of Common Stock from vesting				4,951			4,951
Repurchase and cancellation of Common Stock and warrants (in shares)			(2,793,000)
Repurchase and cancellation of Common Stock and warrants				(76,788)			(76,788)
Issuance of Common Stock from the exercise of options and warrants (in shares)			341,000
Issuance of Common Stock from the exercise of warrants				5,414			5,414
Withholding taxes on net share settlement of stock-based compensation				(3,219)			(3,219)
Ending balance at Mar. 31, 2021			$ 23	3,782,649	(29,996)	(1,746,787)	2,005,889
Ending balance (in shares) at Mar. 31, 2021			226,815,000
Ending Balance at Mar. 31, 2021					(29,996)
Beginning balance (in shares) at Dec. 31, 2020		229,038,158	229,038,000
Beginning balance at Dec. 31, 2020		$ 2,063,873	$ 23	3,852,291	(37,207)	(1,751,234)	2,063,873
Beginning balance at Dec. 31, 2020					(37,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		85,921
Other comprehensive income (loss)		$ 3,494
Issuance of Common Stock from the exercise of options and warrants (in shares)		5,273,466
Ending balance at Sep. 30, 2021		$ 1,956,584	$ 23	3,655,587	(33,713)	(1,665,313)	1,956,584
Ending balance (in shares) at Sep. 30, 2021		223,665,627	223,666,000
Ending Balance at Sep. 30, 2021					(33,713)
Beginning balance (in shares) at Mar. 31, 2021			226,815,000
Beginning balance at Mar. 31, 2021			$ 23	3,782,649	(29,996)	(1,746,787)	2,005,889
Beginning balance at Mar. 31, 2021					(29,996)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						20,371	20,371
Other comprehensive income (loss)					5,239		5,239
Stock-based compensation and issuance of Common Stock from vesting (in shares)			60,000
Stock-based compensation and issuance of Common Stock from vesting				9,038			9,038
Repurchase and cancellation of Common Stock and warrants (in shares)			(4,100,000)
Repurchase and cancellation of Common Stock and warrants				(35,508)			(35,508)
Issuance of Common Stock from the exercise of options and warrants (in shares)			4,058,000
Issuance of Common Stock from the exercise of warrants				384			384
Ending balance at Jun. 30, 2021			$ 23	3,756,563	(24,757)	(1,726,416)	2,005,413
Ending balance (in shares) at Jun. 30, 2021			226,833,000
Ending Balance at Jun. 30, 2021					(24,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ 61,103				61,103	61,103
Other comprehensive income (loss)		(8,956)			(8,956)		(8,956)
Stock-based compensation and issuance of Common Stock from vesting (in shares)			192,000
Stock-based compensation and issuance of Common Stock from vesting				7,686			7,686
Repurchase and cancellation of Common Stock and warrants (in shares)			(3,752,000)
Repurchase and cancellation of Common Stock and warrants				(106,264)			(106,264)
Issuance of Common Stock from the exercise of options and warrants (in shares)			393,000
Issuance of Common Stock from the exercise of warrants				1,517			1,517
Withholding taxes on net share settlement of stock-based compensation				(3,915)			(3,915)
Ending balance at Sep. 30, 2021		$ 1,956,584	$ 23	$ 3,655,587	(33,713)	$ (1,665,313)	$ 1,956,584
Ending balance (in shares) at Sep. 30, 2021		223,665,627	223,666,000
Ending Balance at Sep. 30, 2021					$ (33,713)

[1] See Note 1 for information regarding the Company's conversion of Class A Common Stock to Common Stock on July 1, 2020 concurrent with the Merger.

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ 85,921	$ 71,474
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	235,536	171,425
Provision for credit losses	26,661	22,184
Impairment losses on right of use assets	0	57
Gain on sale of rental equipment and other property, plant and equipment	(25,327)	(8,756)
Amortization of debt discounts and debt issuance costs	10,554	9,547
Fair value loss (gain) on common stock warrant liabilities	26,597	(46,063)
Loss on extinguishment of debt	5,999	42,401
Stock-based compensation expense	21,674	6,958
Deferred income tax expense (benefit)	28,140	(67,324)
Unrealized currency losses, net	34	897
Changes in operating assets and liabilities:
Trade receivables	(93,592)	(15,274)
Inventories	(7,311)	1,440
Prepaid expenses and other assets	3,118	2,215
Operating lease assets and liabilities	59	584
Accrued interest	2,468	(7,657)
Accounts payable and other accrued expenses	45,868	(19,090)
Deferred revenue and customer deposits	25,656	10,077
Net cash provided by operating activities	392,055	175,095
Investing activities:
Acquisition of businesses, net of cash acquired	(56,244)	17,173
Proceeds from sale of rental equipment	42,034	25,281
Purchase of rental equipment and refurbishments	(178,191)	(122,273)
Proceeds from the sale of property, plant and equipment	16,647	5,825
Purchase of property, plant and equipment	(20,836)	(9,079)
Net cash used in investing activities	(196,590)	(83,073)
Financing activities:
Receipts from issuance of Common Stock from the exercise of options	7,315	7,694
Repurchase and cancellation of Common Stock and warrants	(320,562)	0
Payment of Common Stock issuance costs	0	(4,222)
Receipts from borrowings	551,063	2,735,793
Payment of financing costs	0	(64,552)
Repayment of borrowings	(423,591)	(2,715,042)
Payment of debt extinguishment premium costs	(3,705)	(34,610)
Principal payments on finance lease obligations	(12,321)	0
Taxes paid on employee stock awards	(7,134)	(673)
Net cash used in financing activities	(208,935)	(75,612)
Effect of exchange rate changes on cash and cash equivalents	(150)	542
Net change in cash and cash equivalents	(13,620)	16,952
Cash and cash equivalents at the beginning of the period	24,937	3,045
Cash and cash equivalents at the end of the period	11,317	19,997
Supplemental cash flow information:
Interest paid	66,437	80,558
Income taxes paid, net	6,124	1,276
Capital expenditures accrued or payable	$ 35,819	$ 24,179

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Organization and Nature of Operations

WillScot Mobile Mini Holdings Corp. (“WillScot Mobile Mini” and, together with its subsidiaries, the “Company”) is a leading provider of modular space and portable storage solutions in the United States (“US”), Canada, Mexico and the United Kingdom ("UK"). The Company also maintains a fleet of specialty containment products, including liquid and solid containment solutions. The Company leases, sells, delivers and installs mobile solutions and storage products through an integrated network of branch locations that spans North America and the UK.

On July 1, 2020, WillScot Corporation, a Delaware corporation (“WillScot”), and Mobile Mini, Inc. (“Mobile Mini”) merged (the “Merger”). Immediately following the Merger, WillScot changed its name to “WillScot Mobile Mini Holdings Corp.” and filed an amended and restated certificate of incorporation (the "A&R Charter"), which reclassified all outstanding shares of WillScot Class A Common Stock and converted such shares into shares of Common Stock, par value $0.0001 per share, of WillScot Mobile Mini ("WillScot Mobile Mini Common Stock"). The WillScot Class A Common Stock was listed on the Nasdaq Capital Market (Nasdaq: WSC) up until the Merger, and the WillScot Mobile Mini Common Stock has been listed on the Nasdaq Capital Market (Nasdaq: WSC) since the Merger. As used herein, the term “Common Stock” or “the Company’s Common Stock” refers to WillScot Class A Common Stock prior to filing of the A&R Charter on July 1, 2020 and to WillScot Mobile Mini Common Stock as of and following the filing of the A&R Charter July 1, 2020.

The preparation of financial statements in accordance with US Generally Accepted Accounting Principles (“GAAP”) requires that our condensed consolidated financial statements and most of the disclosures in these notes be presented on a historical basis. Unless the context otherwise requires, the terms “Company” and “WillScot Mobile Mini” as used in these financial statements mean WillScot and its subsidiaries when referring to periods prior to July 1, 2020 (prior to the Merger) and to WillScot Mobile Mini, when referring to periods on or after July 1, 2020 (after the Merger).

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Quarterly Report on Form 10-Q and do not include all the information and notes required by GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements comprise the financial statements of WillScot Mobile Mini and its subsidiaries that it controls due to ownership of a majority voting interest and contain all adjustments, which are of a normal and recurring nature, necessary to present fairly the financial position, results of operations and cash flows for the interim periods presented.

Subsidiaries are fully consolidated from the date of acquisition, being the date on which the Company obtains control, and continue to be consolidated until the date when such control ceases. The financial statements of the subsidiaries are prepared for the same reporting period as the Company. All intercompany balances and transactions are eliminated.

The results of operations for the nine months ended September 30, 2021 are not necessarily indicative of the results to be expected for the full year. For further information, refer to the consolidated financial statements and notes included in the Company's Annual Report on Form 10-K/A for the year ended December 31, 2020.

Reclassifications

Certain reclassifications have been made to prior year financial statements to conform to the current year presentation.

Recently Issued and Adopted Accounting Standards

Recently Issued Accounting Standards

In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848), which is elective, and provides for optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The Company is currently evaluating the impact of reference rate reform and the potential impact of adoption of these elective practical expedients on its consolidated financial statements and does not expect the impact to be material.

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40). The new ASU eliminates the beneficial conversion and cash conversion accounting models for convertible instruments. It also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, the new guidance modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The amendments in the ASU are effective for public entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. The Company does not expect the adoption of this pronouncement to have a material impact on its consolidated financial statements.

Recently Adopted Accounting StandardsIn December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which removes certain exceptions to the general principles for income taxes and also improves consistent application of accounting by clarifying or amending existing guidance. On January 1, 2021, the Company adopted ASU 2019-12 and the impact of adoption was not material to the Company's consolidated financial statements. The Company applied the standard prospectively for intraperiod tax allocation, year-to-date losses that exceed anticipated annual losses and enacted changes in tax laws.

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Acquisitions

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Acquisitions

Acquisitions

Mobile Mini Merger

Purchase Price

Upon completion of the Merger on July 1, 2020, each issued and outstanding share of Mobile Mini Common Stock, par value $0.01 per share, converted to 2.405 shares of WillScot Class A Common Stock, par value $0.0001 per share, and cash in lieu of any fractional shares. The Company issued 106,426,721 shares of Class A Common Stock to Mobile Mini stockholders as consideration for the Merger. The trading price of the Class A Common Stock was $12.53 per share on the closing date. In addition, Mobile Mini stock options converted into WillScot Mobile Mini stock options. The purchase price was determined as follows:

(in thousands, except share and per share data)	July 1, 2020
Mobile Mini Common Stock outstanding	44,252,275
Share conversion ratio	2.405
Common Stock issued	106,426,721
Common Stock per share price as of July 1, 2020	$	12.53
Fair value of shares of WillScot Class A Common Stock issued	$	1,333,527
Cash paid for fractional shares	30
Fair value of Mobile Mini Options converted to WillScot Mobile Mini Options	19,279
Total purchase price	$	1,352,836

The Merger was accounted for using the acquisition method of accounting, and WillScot was considered the accounting acquirer. Under the acquisition method of accounting, the Company assigned the purchase price to tangible and identifiable intangible assets acquired and liabilities assumed based on their fair values at the closing date. The excess of the purchase price over those fair values was recorded as goodwill.

The Company recorded the fair values based on independent valuations, discounted cash flow analyses, quoted market prices, contributory asset charges, and estimates made by management. The following table summarizes the July 1, 2020 fair values of the assets acquired and liabilities assumed.

Opening Balance Sheet

(in thousands)	July 1, 2020
Cash and cash equivalents	$	17,203
Trade receivables	87,492
Inventories	8,987
Prepaid expenses and other current assets	13,717
Rental equipment	1,032,672
Property, plant and equipment	160,729
Operating lease assets	92,054
Intangible assets	374,500
Goodwill identified	937,135
Other non-current assets	2,520
Total identifiable assets acquired	2,727,009
Accounts payable	(29,797)
Accrued expenses	(40,335)
Deferred revenue and customer deposits	(38,846)
Operating lease liabilities	(89,968)
Debt and finance lease liabilities	(897,244)
Deferred tax liabilities	(276,555)
Other long-term liabilities	(1,428)
Total liabilities assumed	(1,374,173)
Purchase Price	$	1,352,836

Mobile Mini generated $522.3 million of revenue and $94.3 million of pre-tax income in the nine months ended September 30, 2021, which is included in the condensed consolidated statements of operations.

The pro forma results presented below give effect to the following as if they occurred on January 1, 2019:

(i)	The Merger;
(ii)	Borrowings under the Company's 2025 Secured Notes and 2020 ABL Facility (both as defined in Note 9) used to repay certain debt in connection with the Merger;
(iii)	Extinguishment of the Mobile Mini revolving credit facility and senior notes assumed in the Merger and immediately repaid;
(iv)	Extinguishment of WillScot's 2017 ABL Facility and WillScot's 2022 Secured Notes (both as defined in Note 9) repaid in connection with the Merger;
(v)	Transaction costs incurred in connection with the Merger; and
(vi)	Elimination of WillScot's non-controlling interest and WillScot's Class B common stock in connection with the Merger. See Note 10 for further details.

The pro forma information is not necessarily indicative of the Company’s results of operations had the Merger been completed on January 1, 2019, nor is it necessarily indicative of the Company’s future results. The pro forma information does not reflect any cost savings from operating efficiencies, synergies, or revenue opportunities that could result from the Merger.

The Company's results of operations for the three and nine months ended September 30, 2021 and the three months ended September 30, 2020 represent the activities of the Company after the Merger. As a result, there were no differences between pro forma results and actual results on a reported basis.

The tables below present unaudited pro forma condensed combined statement of operations information for the nine months ended September 30, 2020:

(in thousands)	Nine Months Ended September 30, 2020
WillScot revenues	$	929,998
Mobile Mini revenues	284,240
Pro forma revenues	$	1,214,238
WillScot Mobile Mini income before income tax	$	5,304	(a)
Mobile Mini income before income tax	37,875
Pro forma income before income tax	43,179
Pro forma adjustments to combined income before income tax:
Elimination of Merger transaction costs	80,040		(b)
Impact of fair value mark-ups on rental fleet depreciation	(2,334)		(c)
Other depreciation expense and intangible asset amortization	(11,397)		(d)
Interest expense	(6,113)		(e)
Elimination of Mobile Mini interest expense	15,921		(f)
Elimination of loss on extinguishment of debt	19,682		(g)
Pro forma income before income tax	138,978
Income tax expense	22,300		(h)
Pro forma net income	$	116,678

(a)	Excludes impact of non-controlling interest which was eliminated as part of the Sapphire Exchange. See Note 10.
(b)	Eliminates discrete transaction costs incurred as a result of the Mobile Mini Merger.
(c)	Depreciation on rental equipment and property, plant and equipment were adjusted for the determination of the fair value of equipment acquired in the Mobile Mini Merger.
(d)	Represents the differential in other depreciation and amortization expense related to the fair value purchase accounting adjustments as a result of the Merger, principally the amortization of the Mobile Mini customer relationship valued at $209.0 million.
(e)	In connection with the Merger, the Company entered into a new ABL Facility and drew $1.47 billion at close with an estimated interest rate of 2.046%, issued the 2025 Secured Notes at 6.125%, repaid the 2022 Secured Notes and repaid the 2017 ABL Facility. Interest and amortization of deferred financing fees for the 2020 ABL Facility and the 2025 Secured Notes has been included offset by the removal of interest and amortization of deferred financing fees attributable to the 2022 Secured Notes and the 2017 ABL Facility. See Note 9 for definitions of terms.
(f)	Interest and amortization of deferred financing fees on the senior notes and line of credit maintained by Mobile Mini which were assumed at acquisition and repaid immediately using proceeds from the 2020 ABL Facility and 2025 Secured Notes was eliminated.
(g)	Elimination of loss on extinguishment of debt in connection with the redemption premium on the 2022 Secured Notes and unamortized deferred financing costs on the 2022 Secured Notes and 2017 ABL Facility. See Note 9 for definitions of terms.
(h)	Reflects the recorded income tax provision plus the adjustment to recognize the income tax impacts of the unaudited pro forma adjustments for which a tax expense is recognized using a US federal and state statutory tax rate of 25.5%. This rate may vary from the effective tax rates of the historical and combined businesses. In addition, the three and nine months ended September 30, 2020 included adjustments of $54.1 million and $56.8 million, respectively, to eliminate the reversal of valuation allowance as a result of reassessment of the realizability of deferred tax assets as a result of the Merger.

Other Acquisitions

On September 17, 2021, the Company acquired certain assets and liabilities of Equipe Container Services, Inc., Saf-T-Box, LP and American Mobile Leasing, LLC, which consisted primarily of approximately 11,000 storage units and 400 modular units, for $56.3 million in cash. Based on a preliminary allocation, the accompanying financial statements include approximately $53.0 million and $3.0 million of rental equipment and land, respectively, as a result of these acquisitions.

The amount of revenue and earnings the acquirees included in the consolidated statements of operations for the three and nine-months ended September 30, 2021 is not material to the financial statements. The pre-acquisition revenue and earnings for the acquirees as a percentage of the Company's 2020 Pro Forma results disclosed above and as a percentage of the Company's actual results for the year ended December 31, 2020 were not significant.

Transaction and Integration CostsThe Company recorded $0.3 million and $52.2 million in transaction costs related to the Merger and other acquisitions during the three months ended September 30, 2021 and 2020, respectively, and $1.1 million and $63.2 million in transaction costs related to the Merger and other acquisitions in the nine months ended September 30, 2021 and 2020, respectively. The Company also recorded $8.2 million and $7.1 million in integration costs related to the Merger within selling, general and administrative ("SG&A") expense during the three months ended September 30, 2021 and 2020, respectively, and $23.2 million and $9.4 million during the nine months ended September 30, 2021 and 2020, respectively.

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Revenue

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

Revenue Disaggregation

Geographic Areas

The Company had total revenue in the following geographic areas for the three and nine months ended September 30, 2020 as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
US	$	427,251	$	368,285	$	1,197,800	$	841,227
Canada	31,536		24,098		84,663		57,083
Mexico	3,666		3,279		10,977		10,035
UK	28,099		21,653		83,537		21,653
Total revenues	$	490,552	$	417,315	$	1,376,977	$	929,998

Major Product and Service Lines

Equipment leasing is the Company's core business. This includes rental modular space, portable space and tank and pump units along with value added products and services ("VAPS"), which include furniture, steps, ramps, basic appliances, internet connectivity devices, and other items used by customers in connection with the Company's products. Leasing is complemented by new unit sales and sales of rental units. In connection with its leasing and sales activities, the Company provides services including delivery and installation, maintenance and ad hoc services and removal services at the end of lease transactions.

The Company’s revenue by major product and service line for the three and nine months ended September 30, 2021 was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Modular space leasing revenue	$	188,507	$	163,635	$	539,835	$	427,409
Portable storage leasing revenue	66,184		52,941		179,645		64,506
Tank and pump leasing revenue	19,040		14,112		51,909		14,112
VAPS and third party leasing revenues(a)	73,517		56,330		206,823		139,754
Other leasing-related revenue(b)	16,148		13,064		44,025		32,796
Leasing revenue	363,396		300,082		1,022,237		678,577
Delivery and installation revenue	99,699		84,694		274,883		187,404
Total leasing and services revenue	463,095		384,776		1,297,120		865,981
New unit sales revenue	15,860		19,360		37,823		38,736
Rental unit sales revenue	11,597		13,179		42,034		25,281
Total revenues	$	490,552	$	417,315	$	1,376,977	$	929,998

(a)	Includes $7.2 million and $5.6 million of service revenue for the three months ended September 30, 2021 and 2020, respectively, and $21.2 million and $13.9 million of service revenue for the nine months ended September 30, 2021 and 2020, respectively.
(b)	Includes primarily damage billings, delinquent payment charges, and other processing fees.

Leasing and Services Revenue

The majority of revenue (73% for the three and nine months ended September 30, 2021 and 71% for the three and nine months ended September 30, 2020) is generated by rental income subject to the guidance of ASU 2018-11, Leases (Topic 842) ("ASC 842"). The remaining revenue for the three and nine months ended September 30, 2021 and 2020 is generated by performance obligations in contracts with customers for services or sale of units subject to the guidance in ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASC 606").

Receivables, Contract Assets and Liabilities

As reflected above, approximately 73% of the Company's rental revenue is generated by lease revenue subject to the guidance in ASC 842. The customers that are responsible for the remaining revenue accounted for under ASC 606 are generally the same customers that rent the Company's equipment. The Company manages credit risk associated with its accounts receivables at the customer level. As the same customers generate the revenues that are accounted for under both ASC 606 and ASC 842, the discussions below on credit risk and the Company's allowance for credit losses address its total revenues. The Company's top five customers with the largest open receivables balances represented 4.7% of the total receivables balance as of September 30, 2021.

As of September 30, 2021 and December 31, 2020, the Company had approximately $78.8 million and $74.1 million, respectively, of deferred revenue that relates to removal services for lease transactions and advance billings for sale transactions, which are within the scope of ASC 606 and are included in deferred revenue and customer deposits in the condensed consolidated balance sheets. During the three months ended September 30, 2021, $20.9 million of previously deferred revenue relating to removal services for lease transactions and advance billings for sale transactions was recognized as revenue.

The Company does not have material contract assets and it did not recognize any material impairments of contract assets.

The Company's uncompleted contracts with customers have unsatisfied (or partially satisfied) performance obligations. For the future services revenues that are expected to be recognized within twelve months, the Company has elected to utilize the optional disclosure exemption made available regarding transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations. The transaction price for performance obligations that will be completed in greater than twelve months is variable based on the costs ultimately incurred to provide those services.

The primary costs to obtain contracts for new and rental unit sales with the Company's customers are commissions paid to its sales force. The Company pays its sales force commissions on the sale of new and rental units. For new and rental unit sales, the period benefited by each commission is less than one year, therefore the commissions are expensed as incurred.

Credit Losses

The Company is exposed to credit losses from trade receivables generated through its leasing and sales business. The Company assesses each customer’s ability to pay for the products it leases or sells by conducting a credit review. The credit review considers expected billing exposure and timing for payment and the customer’s established credit rating. The Company performs its credit review of new customers at inception of the customer relationship and for existing customers when the customer transacts new leases after a defined period of dormancy. The Company also considers contract terms and conditions, country risk and business strategy in the evaluation.

The Company monitors ongoing credit exposure through an active review of customer balances against contract terms and due dates. The Company may employ collection agencies and legal counsel to pursue recovery of defaulted receivables. The allowances for credit losses reflect the estimate of the amount of receivables that the Company will be unable to collect based on historical write-off experience and, as applicable, current conditions and reasonable and supportable forecasts that affect collectability. This estimate could require change based on changing circumstances, including changes in the economy or in the particular circumstances of individual customers. Accordingly, the Company may be required to increase or decrease its allowances.

Activity in the allowance for credit losses was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Balance at beginning of period	$	36,785	$	19,183	$	29,258	$	15,828
Net charges to bad debt expense and revenue	9,751		13,062		26,661		22,184
Write-offs	(4,543)		(6,822)		(14,415)		(12,395)
Foreign currency translation and other	(126)		(1,237)		363		(1,431)
Balance at end of period	$	41,867	$	24,186	$	41,867	$	24,186

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Leases

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Leases

Leases

As of September 30, 2021, the undiscounted future lease payments for operating and finance lease liabilities were as follows:

(in thousands)	Operating		Finance
2021 (remaining)	$	16,246	$	5,520
2022	60,038		20,012
2023	49,165		16,561
2024	40,555		13,639
2025	33,371		13,747
Thereafter	76,957		22,841
Total lease payments	276,332		92,320
Less: interest	(42,745)		(6,720)
Present value of lease liabilities	$	233,587	$	85,600

Finance lease liabilities are included within long-term debt and current portion of long-term debt on the condensed consolidated balance sheets.

The Company’s lease activity during the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Financial Statement Line	2021		2020
Finance Lease Expense
Amortization of finance lease assets	$	14,231	$	4,360
Interest on obligations under finance leases	1,674		512
Total finance lease expense	$	15,905	$	4,872
Operating Lease Expense
Fixed lease expense
Cost of leasing and services	$	3,019	$	4,444
Selling, general and administrative	44,732		29,682
Lease impairment expense and other related charges	1,571		2,103
Short-term lease expense
Cost of leasing and services	17,751		19,765
Selling, general and administrative	680		1,612
Lease impairment expense and other related charges	0		471
Variable lease expense
Cost of leasing and services	5,442		5,277
Selling, general and administrative	5,702		3,645
Lease impairment expense and other related charges	402		666
Total operating lease expense	$	79,299	$	67,665

Lease impairment expense and other related charges relate to closed locations that are no longer used in operations as a result of consolidation activities within the Company. During the nine months ended September 30, 2021, the Company recorded $2.3 million in lease impairment expense and other related charges which is comprised of $0.3 million loss on lease exit and impairment charges and $2.0 million in closed location rent expense. During the nine months ended September 30, 2020, the Company recorded $4.0 million in lease impairment expense and other related charges which is comprised of $0.7 million loss on lease exit and $3.3 million in closed location rent expense.

Supplemental cash flow information related to leases for the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Supplemental Cash Flow Information	2021		2020
Cash paid for the amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	48,403	$	35,065
Operating cash outflows from finance leases	$	1,669	$	491
Financing cash outflows from finance leases	$	12,388	$	3,434
Right of use assets obtained in exchange for lease obligations	$	43,448	$	26,727
Assets obtained in exchange for finance leases	$	19,947	$	6,322

Weighted-average remaining operating lease terms and the weighted average discount rates as of September 30, 2021 and December 31, 2020 were as follows:

Lease Terms and Discount Rates	September 30, 2021		December 31, 2020
Weighted-average remaining lease term - operating leases	6.0 years		6.4 years
Weighted-average discount rate - operating leases	5.3	%	5.7	%
Weighted-average remaining lease term - finance leases	4.5 years		4.6 years
Weighted-average discount rate - finance leases	2.9	%	2.9	%

The Company presents information related to leasing revenues in Note 3.

Leases

Leases

As of September 30, 2021, the undiscounted future lease payments for operating and finance lease liabilities were as follows:

(in thousands)	Operating		Finance
2021 (remaining)	$	16,246	$	5,520
2022	60,038		20,012
2023	49,165		16,561
2024	40,555		13,639
2025	33,371		13,747
Thereafter	76,957		22,841
Total lease payments	276,332		92,320
Less: interest	(42,745)		(6,720)
Present value of lease liabilities	$	233,587	$	85,600

Finance lease liabilities are included within long-term debt and current portion of long-term debt on the condensed consolidated balance sheets.

The Company’s lease activity during the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Financial Statement Line	2021		2020
Finance Lease Expense
Amortization of finance lease assets	$	14,231	$	4,360
Interest on obligations under finance leases	1,674		512
Total finance lease expense	$	15,905	$	4,872
Operating Lease Expense
Fixed lease expense
Cost of leasing and services	$	3,019	$	4,444
Selling, general and administrative	44,732		29,682
Lease impairment expense and other related charges	1,571		2,103
Short-term lease expense
Cost of leasing and services	17,751		19,765
Selling, general and administrative	680		1,612
Lease impairment expense and other related charges	0		471
Variable lease expense
Cost of leasing and services	5,442		5,277
Selling, general and administrative	5,702		3,645
Lease impairment expense and other related charges	402		666
Total operating lease expense	$	79,299	$	67,665

Lease impairment expense and other related charges relate to closed locations that are no longer used in operations as a result of consolidation activities within the Company. During the nine months ended September 30, 2021, the Company recorded $2.3 million in lease impairment expense and other related charges which is comprised of $0.3 million loss on lease exit and impairment charges and $2.0 million in closed location rent expense. During the nine months ended September 30, 2020, the Company recorded $4.0 million in lease impairment expense and other related charges which is comprised of $0.7 million loss on lease exit and $3.3 million in closed location rent expense.

Supplemental cash flow information related to leases for the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Supplemental Cash Flow Information	2021		2020
Cash paid for the amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	48,403	$	35,065
Operating cash outflows from finance leases	$	1,669	$	491
Financing cash outflows from finance leases	$	12,388	$	3,434
Right of use assets obtained in exchange for lease obligations	$	43,448	$	26,727
Assets obtained in exchange for finance leases	$	19,947	$	6,322

Weighted-average remaining operating lease terms and the weighted average discount rates as of September 30, 2021 and December 31, 2020 were as follows:

Lease Terms and Discount Rates	September 30, 2021		December 31, 2020
Weighted-average remaining lease term - operating leases	6.0 years		6.4 years
Weighted-average discount rate - operating leases	5.3	%	5.7	%
Weighted-average remaining lease term - finance leases	4.5 years		4.6 years
Weighted-average discount rate - finance leases	2.9	%	2.9	%

The Company presents information related to leasing revenues in Note 3.

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Inventories

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories at the respective balance sheet dates consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Raw materials	$	24,472	$	19,560
Finished units	6,471		4,171
Inventories	$	30,943	$	23,731

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Rental Equipment, net

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Rental Equipment, net

Rental Equipment, net

Rental equipment, net at the respective balance sheet dates consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Modular space units	$	2,901,998	$	2,796,284
Portable storage units	716,033		653,707
Tank and pump products	149,123		132,071
Value added products	158,336		143,652
Total rental equipment	3,925,490		3,725,714
Less: accumulated depreciation	(956,595)		(794,068)
Rental equipment, net	$	2,968,895	$	2,931,646

During the third quarter of 2021, certain of the Company’s rental equipment in Louisiana was adversely impacted by Hurricane Ida. The Company maintains insurance on its rental equipment, generally in the form of replacement cost policies. Such policies are subject to varying deductibles and other conditions. Based on management’s preliminary estimates of potential losses net of insurance recoveries, the impact to our financial statements in Q3 is immaterial.

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Goodwill

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

GoodwillChanges in the carrying amount of goodwill were as follows:

(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Total
Balance at December 31, 2019	$	235,177	$	—	$	—	$	—	$	235,177
Acquisition of Mobile Mini	—		726,529		59,183		143,262		928,974
Effects of movements in foreign exchange rates	651		—		6,417		—		7,068
Balance at December 31, 2020	235,828		726,529		65,600		143,262		1,171,219
Changes to Mobile Mini purchase accounting	285,000		(233,666)		—		(43,173)		8,161
Effects of movements in foreign exchange rates	113		(311)		(910)		18		(1,090)
Balance at September 30, 2021	$	520,941	$	492,552	$	64,690	$	100,107	$	1,178,290

The Company had no goodwill impairment during the nine months ended September 30, 2021 or the year ended December 31, 2020. Changes to Mobile Mini purchase accounting are largely the result of the finalization of the assignment of goodwill to the reporting units during the measurement period.

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Intangibles

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangibles

Intangibles

Intangible assets other than goodwill at the respective balance sheet dates consisted of the following:

	September 30, 2021
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	—	$	3,000	$	(3,000)	$	—
Mobile Mini customer relationships	6.8	209,000		(31,898)		177,102
Technology	4.8	1,500		(313)		1,187
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	502,500	$	(35,211)	$	467,289

	December 31, 2020
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	0.7	$	3,000	$	(2,375)	$	625
Mobile Mini customer relationships	8.0	217,000		(12,053)		204,947
Technology	5.5	1,500		(125)		1,375
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	510,500	$	(14,553)	$	495,947

Amortization expense related to intangible assets was $6.8 million and $5.4 million for the three months ended September 30, 2021 and 2020, respectively, and $20.6 million and $5.9 million for the nine months ended September 30, 2021 and 2020, respectively.

As discussed in Note 2, the Company acquired Mobile Mini on July 1, 2020. The Company recorded $164.0 million to indefinite-lived intangible assets related to the Mobile Mini trade name and $210.5 million of intangibles subject to amortization related to Mobile Mini customer relationships and technology.

Based on the carrying value at September 30, 2021, future amortization of intangible assets is expected to be as follows for the years ended December 31:

(in thousands)
2021 (remaining)	$	6,604
2022	26,416
2023	26,416
2024	26,416
2025	26,416
Thereafter	66,021
Total	$	178,289

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Debt

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt

Debt

The carrying value of debt outstanding at the respective balance sheet dates consisted of the following:

(in thousands, except rates)	Interest rate	Year of maturity	September 30, 2021		December 31, 2020
2025 Secured Notes	6.125%	2025	$	517,581	$	637,068
ABL Facility(a)	Varies	2025	1,521,518		1,263,833
2028 Secured Notes	4.625%	2028	492,253		491,555
Finance Leases	Varies	Varies	85,600		77,874
Total debt			2,616,952		2,470,330
Less: current portion of long-term debt			18,652		16,521
Total long-term debt			$	2,598,300	$	2,453,809

(a) As of both September 30, 2021 and December 31, 2020, the Company had no outstanding principal borrowings on the Multicurrency Facility and $6.6 million and $7.9 million, respectively, of related debt issuance costs. No related debt issuance costs were recorded as a direct offset against the principal borrowings on the Multicurrency Facility, and the $6.6 million and $7.9 million in excess of principal was included in other non-current assets on the condensed consolidated balance sheets.

Asset Backed Lending Facilities ("ABL Facility")

On November 29, 2017, Williams Scotsman Holdings Corp ("Holdings"), Williams Scotsman International, Inc. ("WSII") and certain of its subsidiaries entered into an ABL credit agreement (the “2017 ABL Facility”), as amended, that provided a senior secured revolving credit facility that matured on May 29, 2022. The 2017 ABL Facility consisted of (i) a $1.3 billion asset-backed revolving credit facility for WSII and certain of its domestic subsidiaries (the "2017 US ABL Facility"), (ii) a $140.0 million asset-based revolving credit facility (the "2017 Canadian ABL Facility") for certain Canadian subsidiaries of WSII, and (iii) an accordion feature that permitted the borrowers to increase the lenders’ commitments in an aggregate amount not to exceed $375.0 million, subject to the satisfaction of customary conditions and lender approval, plus any voluntary prepayments that are accompanied by permanent commitment reductions under the 2017 ABL Facility.

On July 1, 2020, in connection with the completion of the Merger, Holdings, WSII, and certain of its subsidiaries, entered into a new asset-based credit agreement, that provides for revolving credit facilities in the aggregate principal amount of up to $2.4 billion, consisting of: (i) a senior secured asset-based US dollar revolving credit facility in the aggregate principal amount of $2.0 billion (the “US Facility”), available to WSII and certain of its subsidiaries (collectively, the “US Borrowers”), and (ii) a $400.0 million senior secured asset-based multicurrency revolving credit facility (the "Multicurrency Facility" together with the US Facility, the “2020 ABL Facility”), available to be drawn in US Dollars, Canadian Dollars, British Pounds Sterling or Euros by the US Borrowers, and certain of WSII’s wholly-owned subsidiaries organized in Canada and in the UK. On July 1, 2020, in connection with the completion of the Merger, approximately $1.5 billion of proceeds from the 2020 ABL Facility were used to repay the 2017 ABL Facility and the asset-backed lending facility assumed in the transaction with Mobile Mini, as well as to pay fees and expenses related to the Merger and the debt financing transactions. In connection with the repayment of the 2017 ABL facility, the Company wrote off $4.4 million of deferred financing costs to loss on extinguishment of debt in the third quarter of 2020. The 2020 ABL Facility matures July 1, 2025.

Borrowings under the 2020 ABL Facility initially bear interest at (i) in the case of US Dollars, at WSII’s option, either an adjusted LIBOR rate plus 1.875% or an alternative base rate plus 0.875%, (ii) in the case of Canadian Dollars, at WSII’s option, either a Canadian BA rate plus 1.875% or Canadian prime rate plus 0.875%, and (iii) in the case of Euros and British Pounds Sterling, an adjusted LIBOR rate plus 1.875%. The 2020 ABL Facility requires the payment of an annual commitment fee on the unused available borrowings of 0.225% per annum. At September 30, 2021, the weighted average interest rate for borrowings under the 2020 ABL Facility was 1.97%. The weighted average interest rate on the balance outstanding as of September 30, 2021, as adjusted for the effects of the interest rate swap agreements, was 2.73%. Refer to Note 16 for a more detailed discussion on interest rate management.

Borrowing availability under the US Facility and the Multicurrency Facility is equal to the lesser of (i) the aggregate Revolver Commitments and (ii) the Line Cap. At September 30, 2021, the Line Cap was $2.4 billion and the Borrowers had $831.6 million of available borrowing capacity under the 2020 ABL Facility, including $431.6 million under the US Facility and $400.0 million under the Multicurrency Facility. At September 30, 2021, borrowing capacity under the 2020 ABL Facility allowed for up to $207.1 million of letters of credit and up to $170.0 million of swingline loans. At September 30, 2021, letters of credit and bank guarantees carried fees of 2.00%. The Company had issued $12.9 million of standby letters of credit under the 2020 ABL Facility at September 30, 2021.

The Company had $1.6 billion outstanding principal under the 2020 ABL Facility at September 30, 2021. Debt issuance costs of $34.0 million were included in the carrying value of the 2020 ABL Facility at September 30, 2021.

2022 Senior Secured Notes

WSII had $270.0 million aggregate principal amount of 7.875% senior secured notes due December 15, 2022 (the “2022 Secured Notes”). In connection with the Merger and related financing transactions in the third quarter of 2020, using proceeds from the 2025 Secured Notes discussed below, the Company redeemed all of its 2022 Secured Notes.

2023 Senior Secured Notes

WSII had $490.0 million of 6.875% senior secured notes due August 15, 2023 (the “2023 Secured Notes”). On August 11, 2020, WSII redeemed 10% of the outstanding principal amount of the 2023 Secured Notes, $49.0 million. On August 25, 2020, the Company completed a private offering of its 2028 Secured Notes, discussed below, and used the offering proceeds to repay, along with expenses, the $441.0 million outstanding principal amount of its 2023 Secured Notes.

2025 Senior Secured Notes

In anticipation of the Merger, on June 15, 2020, Picasso Finance Sub, Inc., a newly-formed indirect finance subsidiary (the “Finance Sub”) of the Company, completed a private offering of $650.0 million in aggregate principal amount of its 6.125% senior secured notes due 2025 (the “2025 Secured Notes”). Finance Sub was merged into WSII on July 1, 2020. The offering proceeds were used to repay the 2022 Secured Notes, repay Mobile Mini senior notes assumed in the acquisition and pay certain fees and expenses related to the Merger and the related financing transactions.

On March 26, 2021, using cash on hand and borrowings on the 2020 ABL Facility, the Company redeemed 10% of the outstanding principal, or $65.0 million, of its 2025 Secured Notes and recorded a loss on extinguishment of debt in the condensed consolidated statement of operations of $3.2 million comprised of a redemption premium of $1.9 million and write- off of unamortized deferred financing fees of $1.3 million in the first quarter of 2021.

On June 16, 2021, using cash on hand and borrowings on the 2020 ABL Facility, the Company redeemed 10% of the outstanding principal, or $58.5 million, of its 2025 Secured Notes and recorded a loss on extinguishment of debt in the condensed consolidated statement of operations of $2.8 million comprised of a redemption premium of $1.8 million and write-off of unamortized deferred financing fees of $1.0 million in the second quarter of 2021.

The 2025 Secured Notes mature on June 15, 2025 and bear interest at a rate of 6.125% per annum. Interest is payable semi-annually on June 15 and December 15 of each year, beginning December 15, 2020. Unamortized deferred financing costs pertaining to the 2025 Secured Notes were $8.9 million as of September 30, 2021.

2028 Senior Secured Notes

On August 25, 2020, the Company, completed a private offering of $500.0 million in aggregate principal amount of 4.625% senior secured notes due 2028 (the “2028 Secured Notes”). The 2028 Secured Notes mature on August 15, 2028. They bear interest at a rate of 4.625% per annum. Interest is payable semi-annually on August 15 and February 15 of each year, beginning February 15, 2021. Unamortized deferred financing cost pertaining to the 2028 Secured Notes were $7.7 million as of September 30, 2021.

Finance Leases

The Company maintains finance leases primarily related to transportation equipment. At September 30, 2021 and December 31, 2020, obligations under finance leases for certain real property and transportation related equipment were $85.6 million and $77.9 million, respectively. Refer to Note 4 for further information.

The Company is in compliance with all debt covenants and restrictions for the aforementioned debt instruments as of September 30, 2021 and December 31, 2020.

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Equity

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Equity

Equity

Common Stock

On June 30, 2020, as contemplated by the merger agreement, Sapphire Holding S.à r.l. ("Sapphire Holdings"), an affiliate of TDR Capital LLP (“TDR Capital”), exchanged each of its shares of common stock of Holdings for 1.3261 shares of newly issued WillScot Class A Common Stock (the "Sapphire Exchange"). As a result of the Sapphire Exchange, all issued and outstanding shares of WillScot’s Class B Common Stock, par value $0.0001 per share (the "Class B Common Stock"), were automatically canceled for no consideration and the existing exchange agreement was automatically terminated. As a result of the Sapphire Exchange, Holdings became a wholly-owned subsidiary of WillScot. Sapphire Holdings received 10,641,182 shares of Common Stock of WillScot in the Sapphire Exchange. Prior to the Sapphire Exchange, Sapphire Holdings' ownership of Holdings was recorded as a non-controlling interest in the consolidated financial statements. Subsequent to the Sapphire Exchange, the Company's subsidiaries are each wholly owned and there is no non-controlling interest. As a result of the Sapphire Exchange, non-controlling interest of $63.9 million was reclassified to $66.9 million of additional paid-in-capital and $3.0 million to accumulated other comprehensive loss, on the condensed consolidated balance sheet.

In connection with the Merger on July 1, 2020, the Company issued 106,426,722 shares of Class A Common Stock in exchange for Mobile Mini Common Stock outstanding and subsequently filed an amended and restated certificate of incorporation, which reclassified all outstanding shares of the Class A Common Stock and converted such shares into shares of Common Stock, par value $0.0001 per share, of WillScot Mobile Mini.

In connection with the stock compensation vesting events and stock option exercises described in Note 15, and the warrant exercises described below, the Company issued 5,273,466 shares of Common Stock during the nine months ended September 30, 2021.

Stock Repurchase Program

On August 7, 2020, the Company's Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $250 million of its outstanding shares of Common Stock. On April 29, 2021, the Board of Directors approved an increase in repurchase authority to $500 million. The stock repurchase program does not obligate the Company to purchase any particular number of shares, and the timing and exact amount of any repurchases will depend on various factors, including market pricing and conditions, business, legal, accounting, and other considerations.

The Company may repurchase its shares in open market transactions from time to time or through privately negotiated transactions in accordance with federal securities laws, at the Company's discretion. The repurchase program, which has no expiration date, may be increased, suspended, or terminated at any time. The program is expected to be implemented over the course of several years and is conducted subject to the covenants in the agreements governing the Company's indebtedness.

During the nine months ended September 30, 2021, the Company repurchased 11,656,552 shares of Common Stock and stock equivalents for $322.6 million. As of September 30, 2021, $142.2 million of the approved repurchase pool remained available. In October of 2021, the Company's Board of Directors replaced the existing share repurchase program with a new share repurchase program that authorizes the Company to repurchase up to $1.0 billion of its outstanding shares of Common Stock and equivalents.

Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive income (loss) ("AOCI"), net of tax, for the nine months ended September 30, 2021 and 2020 were as follows:

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2020	$	(24,694)	$	(12,513)	$	(37,207)
Other comprehensive income (loss) before reclassifications	5,034		(760)		4,274
Reclassifications from AOCI to income	—		2,937		2,937
Balance at March 31, 2021	(19,660)		(10,336)		(29,996)
Other comprehensive income (loss) before reclassifications	3,093		(848)		2,245
Reclassifications from AOCI to income	—		2,994		2,994
Balance at June 30, 2021	(16,567)		(8,190)		(24,757)
Other comprehensive loss before reclassifications	(11,162)		(830)		(11,992)
Reclassifications from AOCI to income	—		3,036		3,036
Balance at September 30, 2021	$	(27,729)	$	(5,984)	$	(33,713)

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2019	$	(52,982)	$	(9,793)	$	(62,775)
Other comprehensive loss before reclassifications	(21,144)		(10,330)		(31,474)
Reclassifications from AOCI to income	—		1,572		1,572
Less other comprehensive loss attributable to non-controlling interest	1,913		790		2,703
Balance at March 31, 2020	(72,213)		(17,761)		(89,974)
Other comprehensive income (loss) before reclassifications	7,982		(1,642)		6,340
Reclassifications from AOCI to income	—		2,617		2,617
Less other comprehensive income attributable to non-controlling interest	(730)		(88)		(818)
Impact of elimination of non-controlling interest on accumulated other comprehensive income	(1,299)		(1,673)		(2,972)
Balance at June 30, 2020	(66,260)		(18,547)		(84,807)
Other comprehensive income prior to reclassifications	14,619		947		15,566
Reclassifications from AOCI to income	—		2,958		2,958
Balance at September 30, 2020	$	(51,641)	$	(14,642)	$	(66,283)

For the nine months ended September 30, 2021 and 2020, $9.0 million and $7.1 million, respectively, was reclassified from AOCI into the condensed consolidated statements of operations within interest expense related to the interest rate swaps discussed in Note 16. The Company recorded a tax expense of $0.7 million and $2.0 million for the three and nine months ended September 30, 2021, respectively, and an income tax benefit of $1.2 million for the three and nine months ended September 30, 2020 associated with this reclassification.

Warrants

Warrants

2015 Public Warrants

WillScot was incorporated under the name Double Eagle Acquisition Corporation ("DEAC") on June 26, 2015. On November 29, 2017, DEAC acquired WSII from Algeco Scotsman Global S.à.r.l., which is majority owned by an investment fund managed by TDR Capital, and DEAC domesticated to Delaware and changed its name to WillScot Corporation.

As part of its initial public offering, DEAC issued warrants (the “2015 Public Warrants”). Each 2015 Public Warrant entitled the holder to purchase one-half of one share of Common Stock at a price of $5.75 per half share (or $11.50 per whole share), subject to adjustment. On January 24, 2020, the Company delivered a notice (the "Redemption Notice") to redeem all of its 2015 Public Warrants that remained unexercised on February 24, 2020. As further described in the Redemption Notice and permitted under the Warrant Agreement, holders of these warrants who exercised them following the date of the Redemption Notice were required to do so on a cashless basis. From January 1, 2020 through January 24, 2020, 796,610 warrants were exercised for cash, resulting in the Company receiving cash proceeds of $4.6 million and the Company issuing 398,305 shares of the Company's Class A Common Stock. After January 24, 2020 through February 24, 2020, 5,836,048 warrants were exercised on a cashless basis. An aggregate of 1,097,162 shares of the Company's Class A Common Stock was issued in connection with these exercises. On February 24, 2020, the Company completed the redemption of 38,509 remaining warrants under the Redemption Notice for $0.01 per warrant. No Public Warrants remain outstanding.

2015 Private Warrants

DEAC also issued warrants to purchase its Common Stock in a private placement concurrently with its initial public offering (the “2015 Private Warrants”). Each 2015 Private Warrant entitled the holder to purchase one-half of one share of Common Stock at a price of $5.75 per half share (or $11.50 per whole share), subject to adjustment. Additionally, if held by certain original investors (or their permitted assignees), the 2015 Private Warrants could be exercised on a cashless basis and are not subject to redemption. During the six months ended June 30, 2021, 3,055,000 2015 Private Warrants were repurchased for $25.5 million and cancelled. In addition, during the six months ended June 30, 2021, 9,655,000 warrants were exercised on a cashless basis, resulting in the issuance of 2,939,898 shares of Common Stock. As a result of these transactions, no 2015 private warrants remain outstanding.

2018 Warrants

In connection with the Modular Space Holdings ("ModSpace") acquisition in 2018, WillScot issued warrants to purchase approximately 10.0 million shares of Common Stock (the "2018 Warrants") to former shareholders of ModSpace. Each 2018 Warrant entitles the holder thereof to purchase one share of Common Stock at an exercise price of $15.50 per share, subject to potential adjustment. The 2018 Warrants expire on November 29, 2022. During the nine months ended September 30, 2021, 223,310 of these 2018 Warrants were repurchased for $2.3 million and cancelled. In addition, during the nine months ended September 30, 2021, 2,981,195 2018 Warrants were exercised on a cashless basis, resulting in the issuance of 1,372,548 shares of common stock. At September 30, 2021, 6,525,736 2018 Warrants were outstanding.

The Company accounted for its warrants in the following ways: (i) the 2015 Public Warrants as liabilities through their final redemption in February 2020, (ii) the 2015 Private Warrants as liabilities through their final repurchase or exercise in May 2021, and (iii) the 2018 Warrants as liabilities until June 30, 2020, the date all issued and outstanding shares of the Company's Class B Common Stock were cancelled. Subsequent to June 30, 2020, the 2018 Warrants were equity classified.

The Company determined the following fair values for the outstanding common stock warrants recorded as liabilities:

(in thousands)	September 30, 2021	December 31, 2020
2015 Private Warrants	N/A	$	77,404

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Warrants

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Warrants

Equity

Common Stock

On June 30, 2020, as contemplated by the merger agreement, Sapphire Holding S.à r.l. ("Sapphire Holdings"), an affiliate of TDR Capital LLP (“TDR Capital”), exchanged each of its shares of common stock of Holdings for 1.3261 shares of newly issued WillScot Class A Common Stock (the "Sapphire Exchange"). As a result of the Sapphire Exchange, all issued and outstanding shares of WillScot’s Class B Common Stock, par value $0.0001 per share (the "Class B Common Stock"), were automatically canceled for no consideration and the existing exchange agreement was automatically terminated. As a result of the Sapphire Exchange, Holdings became a wholly-owned subsidiary of WillScot. Sapphire Holdings received 10,641,182 shares of Common Stock of WillScot in the Sapphire Exchange. Prior to the Sapphire Exchange, Sapphire Holdings' ownership of Holdings was recorded as a non-controlling interest in the consolidated financial statements. Subsequent to the Sapphire Exchange, the Company's subsidiaries are each wholly owned and there is no non-controlling interest. As a result of the Sapphire Exchange, non-controlling interest of $63.9 million was reclassified to $66.9 million of additional paid-in-capital and $3.0 million to accumulated other comprehensive loss, on the condensed consolidated balance sheet.

In connection with the Merger on July 1, 2020, the Company issued 106,426,722 shares of Class A Common Stock in exchange for Mobile Mini Common Stock outstanding and subsequently filed an amended and restated certificate of incorporation, which reclassified all outstanding shares of the Class A Common Stock and converted such shares into shares of Common Stock, par value $0.0001 per share, of WillScot Mobile Mini.

In connection with the stock compensation vesting events and stock option exercises described in Note 15, and the warrant exercises described below, the Company issued 5,273,466 shares of Common Stock during the nine months ended September 30, 2021.

Stock Repurchase Program

On August 7, 2020, the Company's Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $250 million of its outstanding shares of Common Stock. On April 29, 2021, the Board of Directors approved an increase in repurchase authority to $500 million. The stock repurchase program does not obligate the Company to purchase any particular number of shares, and the timing and exact amount of any repurchases will depend on various factors, including market pricing and conditions, business, legal, accounting, and other considerations.

The Company may repurchase its shares in open market transactions from time to time or through privately negotiated transactions in accordance with federal securities laws, at the Company's discretion. The repurchase program, which has no expiration date, may be increased, suspended, or terminated at any time. The program is expected to be implemented over the course of several years and is conducted subject to the covenants in the agreements governing the Company's indebtedness.

During the nine months ended September 30, 2021, the Company repurchased 11,656,552 shares of Common Stock and stock equivalents for $322.6 million. As of September 30, 2021, $142.2 million of the approved repurchase pool remained available. In October of 2021, the Company's Board of Directors replaced the existing share repurchase program with a new share repurchase program that authorizes the Company to repurchase up to $1.0 billion of its outstanding shares of Common Stock and equivalents.

Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive income (loss) ("AOCI"), net of tax, for the nine months ended September 30, 2021 and 2020 were as follows:

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2020	$	(24,694)	$	(12,513)	$	(37,207)
Other comprehensive income (loss) before reclassifications	5,034		(760)		4,274
Reclassifications from AOCI to income	—		2,937		2,937
Balance at March 31, 2021	(19,660)		(10,336)		(29,996)
Other comprehensive income (loss) before reclassifications	3,093		(848)		2,245
Reclassifications from AOCI to income	—		2,994		2,994
Balance at June 30, 2021	(16,567)		(8,190)		(24,757)
Other comprehensive loss before reclassifications	(11,162)		(830)		(11,992)
Reclassifications from AOCI to income	—		3,036		3,036
Balance at September 30, 2021	$	(27,729)	$	(5,984)	$	(33,713)

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2019	$	(52,982)	$	(9,793)	$	(62,775)
Other comprehensive loss before reclassifications	(21,144)		(10,330)		(31,474)
Reclassifications from AOCI to income	—		1,572		1,572
Less other comprehensive loss attributable to non-controlling interest	1,913		790		2,703
Balance at March 31, 2020	(72,213)		(17,761)		(89,974)
Other comprehensive income (loss) before reclassifications	7,982		(1,642)		6,340
Reclassifications from AOCI to income	—		2,617		2,617
Less other comprehensive income attributable to non-controlling interest	(730)		(88)		(818)
Impact of elimination of non-controlling interest on accumulated other comprehensive income	(1,299)		(1,673)		(2,972)
Balance at June 30, 2020	(66,260)		(18,547)		(84,807)
Other comprehensive income prior to reclassifications	14,619		947		15,566
Reclassifications from AOCI to income	—		2,958		2,958
Balance at September 30, 2020	$	(51,641)	$	(14,642)	$	(66,283)

For the nine months ended September 30, 2021 and 2020, $9.0 million and $7.1 million, respectively, was reclassified from AOCI into the condensed consolidated statements of operations within interest expense related to the interest rate swaps discussed in Note 16. The Company recorded a tax expense of $0.7 million and $2.0 million for the three and nine months ended September 30, 2021, respectively, and an income tax benefit of $1.2 million for the three and nine months ended September 30, 2020 associated with this reclassification.

Warrants

Warrants

2015 Public Warrants

WillScot was incorporated under the name Double Eagle Acquisition Corporation ("DEAC") on June 26, 2015. On November 29, 2017, DEAC acquired WSII from Algeco Scotsman Global S.à.r.l., which is majority owned by an investment fund managed by TDR Capital, and DEAC domesticated to Delaware and changed its name to WillScot Corporation.

As part of its initial public offering, DEAC issued warrants (the “2015 Public Warrants”). Each 2015 Public Warrant entitled the holder to purchase one-half of one share of Common Stock at a price of $5.75 per half share (or $11.50 per whole share), subject to adjustment. On January 24, 2020, the Company delivered a notice (the "Redemption Notice") to redeem all of its 2015 Public Warrants that remained unexercised on February 24, 2020. As further described in the Redemption Notice and permitted under the Warrant Agreement, holders of these warrants who exercised them following the date of the Redemption Notice were required to do so on a cashless basis. From January 1, 2020 through January 24, 2020, 796,610 warrants were exercised for cash, resulting in the Company receiving cash proceeds of $4.6 million and the Company issuing 398,305 shares of the Company's Class A Common Stock. After January 24, 2020 through February 24, 2020, 5,836,048 warrants were exercised on a cashless basis. An aggregate of 1,097,162 shares of the Company's Class A Common Stock was issued in connection with these exercises. On February 24, 2020, the Company completed the redemption of 38,509 remaining warrants under the Redemption Notice for $0.01 per warrant. No Public Warrants remain outstanding.

2015 Private Warrants

DEAC also issued warrants to purchase its Common Stock in a private placement concurrently with its initial public offering (the “2015 Private Warrants”). Each 2015 Private Warrant entitled the holder to purchase one-half of one share of Common Stock at a price of $5.75 per half share (or $11.50 per whole share), subject to adjustment. Additionally, if held by certain original investors (or their permitted assignees), the 2015 Private Warrants could be exercised on a cashless basis and are not subject to redemption. During the six months ended June 30, 2021, 3,055,000 2015 Private Warrants were repurchased for $25.5 million and cancelled. In addition, during the six months ended June 30, 2021, 9,655,000 warrants were exercised on a cashless basis, resulting in the issuance of 2,939,898 shares of Common Stock. As a result of these transactions, no 2015 private warrants remain outstanding.

2018 Warrants

In connection with the Modular Space Holdings ("ModSpace") acquisition in 2018, WillScot issued warrants to purchase approximately 10.0 million shares of Common Stock (the "2018 Warrants") to former shareholders of ModSpace. Each 2018 Warrant entitles the holder thereof to purchase one share of Common Stock at an exercise price of $15.50 per share, subject to potential adjustment. The 2018 Warrants expire on November 29, 2022. During the nine months ended September 30, 2021, 223,310 of these 2018 Warrants were repurchased for $2.3 million and cancelled. In addition, during the nine months ended September 30, 2021, 2,981,195 2018 Warrants were exercised on a cashless basis, resulting in the issuance of 1,372,548 shares of common stock. At September 30, 2021, 6,525,736 2018 Warrants were outstanding.

The Company accounted for its warrants in the following ways: (i) the 2015 Public Warrants as liabilities through their final redemption in February 2020, (ii) the 2015 Private Warrants as liabilities through their final repurchase or exercise in May 2021, and (iii) the 2018 Warrants as liabilities until June 30, 2020, the date all issued and outstanding shares of the Company's Class B Common Stock were cancelled. Subsequent to June 30, 2020, the 2018 Warrants were equity classified.

The Company determined the following fair values for the outstanding common stock warrants recorded as liabilities:

(in thousands)	September 30, 2021	December 31, 2020
2015 Private Warrants	N/A	$	77,404

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Income Taxes

9 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company recorded $6.6 million and $36.0 million of income tax expense for the three and nine months ended September 30, 2021, respectively, and $66.7 million and $66.2 million of income tax benefit for the three and nine months ended September 30, 2020, respectively. The Company’s effective tax rate for the three and nine months ended September 30, 2021 was 9.8% and 29.5%, respectively. The Company's effective tax rate for the three and nine months ended September 30, 2020 was 91.7% and (1,247.5)%, respectively.

The effective tax rate for the three months ended September 30, 2021 differs from the US federal statutory rate of 21% primarily due to the reversal of approximately $12.8 million in reserves for uncertain tax positions (“UTP”) due to the expiration of relevant statutes of limitation. The effective tax rate for the nine months ended September 30, 2021 differs from the US federal statutory rate of 21% primarily due to the permanent add-backs related to fair value accounting on the Company’s warrants and executive compensation with an offset related to the discrete tax benefit from the reversal of reserves for UTP.

The effective tax rate for the three months ended September 30, 2020 is different from the US statutory rate of 21% primarily as a result of a pre-tax loss approximately equal to the discrete tax benefit from the reversal of the Company’s valuation allowance on net operating losses prior to the merger with Mobile Mini and the reversal of reserves for UTP due to the expiration of statutes of limitations. The effective tax rate for the nine months ended September 30, 2020 is different from the US statutory rate of 21% primarily as a result of discrete benefits from the reversal of valuation allowances and reserves for UTP.

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Fair Value Measures

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measures

Fair Value Measures

The fair value of financial assets and liabilities are included at the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale.

The Company utilizes the suggested accounting guidance for the three levels of inputs that may be used to measure fair value:

Level 1 -	Observable inputs such as quoted prices in active markets for identical assets or liabilities;
Level 2 -	Observable inputs, other than Level 1 inputs in active markets, that are observable either directly or indirectly; and
Level 3 -	Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions

The Company has assessed that the fair value of cash and cash equivalents, trade receivables, trade payables, and other current liabilities approximate their carrying amounts. Based on the borrowing rates currently available for bank loans with similar terms and average maturities, the fair value of finance leases at September 30, 2021 approximate their respective book values.

Prior to their redemption, the Company’s 2015 Public Warrants traded in active markets. When classified as liabilities, warrants traded in active markets with sufficient trading volume represent Level 1 financial instruments as they are publicly traded in active markets and thus have observable market prices which are used to estimate the fair value adjustments for the related common stock warrant liabilities. When classified as liabilities, warrants not traded in active markets, or traded with insufficient volume, represent Level 3 financial instruments that are valued using a Black-Scholes option-pricing model to estimate the fair value adjustments for the related common stock warrant liabilities.

The following table shows the carrying amounts and fair values of financial liabilities which are disclosed, but not measured, at fair value, including their levels in the fair value hierarchy:

	September 30, 2021								December 31, 2020
	Carrying Amount		Fair Value						Carrying Amount		Fair Value
(in thousands)			Level 1		Level 2		Level 3				Level 1		Level 2		Level 3
ABL Facilities	$	1,521,518	$	—	$	1,555,500	$	—	$	1,263,833	$	—	$	1,304,612	$	—
2025 Secured Notes	517,581		—		556,374		—		637,068		—		694,876		—
2028 Secured Notes	492,253		—		521,435		—		491,555		—		518,820		—
Total	$	2,531,352	$	—	$	2,633,309	$	—	$	2,392,456	$	—	$	2,518,308	$	—

As of September 30, 2021, the carrying values of the ABL Facilities, the 2025 Secured Notes, and the 2028 Secured Notes include $34.0 million, $8.9 million, and $7.7 million, respectively, of unamortized debt issuance costs, which are presented as a direct reduction of the corresponding liability. As of December 31, 2020, the carrying value of the ABL Facilities, the 2025 Secured Notes, and the 2028 Secured Notes includes $40.8 million, $12.9 million, and $8.4 million, respectively, of unamortized debt issuance costs, which are presented as a direct reduction of the corresponding liability.

The carrying value of the ABL Facilities, excluding debt issuance costs, approximates fair value as the interest rates are variable and reflective of current market rates. The fair value of the 2025 Secured Notes and the 2028 Secured Notes is based on their last trading price at the end of each period obtained from a third party. The classification and the fair value of derivative assets and liabilities designated as hedges in the condensed consolidated balance sheets are disclosed in Note 16.

The following table shows the carrying amounts and fair values of financial liabilities which are measured at fair value:

	September 30, 2021								December 31, 2020
	Carrying Amount		Fair Value						Carrying Amount		Fair Value
(in thousands)			Level 1		Level 2		Level 3				Level 1		Level 2		Level 3
2015 Private warrants	N/A		N/A		N/A		N/A		$	77,404	$	—	$	—	$	77,404
Total	$	—	$	—	$	—	$	—	$	77,404	$	—	$	—	$	77,404

Level 3 Disclosures

When the 2015 Private Warrants and 2018 Warrants were classified as liabilities, the Company utilized a Black Scholes option-pricing model to value the warrants at each reporting period and transaction date, with changes in fair value recognized in the statements of operations. The estimated fair value of the common stock warrant liability was determined using Level 3 inputs. Inherent in the pricing model were assumptions related to expected share-price volatility, expected life, risk-free interest rate and dividend yield. The Company estimated the volatility of its ordinary shares based on historical volatility that matched the expected remaining life of the warrants. The risk-free interest rate was based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected remaining life of the warrants. The expected life of the warrants was assumed to be equivalent to their remaining contractual term. The dividend rate was based on the historical rate, which the Company anticipates to remain at zero.

The 2018 Warrants were reclassified to equity at June 30, 2020, the date all issued and outstanding shares of the Company's Class B Common Stock were cancelled.

The following table provides quantitative information regarding Level 3 fair value measurements:

	December 31, 2020
(in thousands)	2015 Private Warrants
Stock Price	$	23.17
Strike Price	$	11.50
Expected Life	1.91
Volatility	41.2		%
Risk Free rate	0.13		%
Dividend yield	—
Fair value of warrants	$	12.17

The following table presents changes in Level 3 liabilities measured at fair value for the three months ended September 30, 2020:

(in thousands)	2015 Private Warrants
Balance - June 30, 2020	$	34,421
Measurement adjustment	22,303
Balance - September 30, 2020	$	56,724

The following table presents changes in Level 3 liabilities measured at fair value for the nine months ended September 30, 2021 and September 30, 2020.

(in thousands)	2015 Private Warrants
Balance - December 31, 2020	$	77,404
Exercise or conversion	(78,495)
Measurement adjustment	25,486
Repurchases	(24,395)
Balance - September 30, 2021	$	—

(in thousands)	2015 Private Warrants		2018 Warrants
Balance - December 31, 2019	$	72,705	$	58,369
Exercise or conversion	—		(416)
Measurement adjustment	(15,981)		(31,737)
Reclassification to equity at June 30, 2020	—		(26,216)
Balance - September 30, 2020	$	56,724	$	—

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Restructuring

9 Months Ended

Sep. 30, 2021

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

Restructuring costs include charges associated with exit or disposal activities that meet the definition of restructuring under FASB ASC Topic 420, Exit or Disposal Cost Obligations (“ASC 420”). The Company's restructuring plans are generally country or region specific and are typically completed within a one-year period. Restructuring costs incurred under these plans include (i) one-time termination benefits related to employee separations, (ii) contract termination costs, and (iii) other related costs associated with exit or disposal activities, including but not limited to, costs for consolidating or closing facilities other than lease costs accounted for under ASC 842. Costs related to the integration of acquired businesses that do not meet the definition of restructuring under ASC 420, such as employee training costs, duplicate facility costs and professional services expenses, are included within SG&A expense.

The following is a summary of the activity in the Company’s restructuring accruals for the three and nine months ended September 30, 2021 and 2020, which primarily relate to employee costs:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands)	2021		2020		2021		2020
Beginning balance	$	4,380	$	525	$	1,750	$	447
Charges	1,856		3,854		11,958		4,543
Cash payments	(3,845)		(2,432)		(5,548)		(3,027)
Foreign currency translation	—		2		—		3
Non-cash movements	(1,442)		133		(7,211)		116
Ending balance	$	949	$	2,082	$	949	$	2,082

    The restructuring charges during the three and nine months ended September 30, 2021 are driven by employee termination costs as a result of the elimination of positions due to the Merger. The restructuring charges during the three months ended September 30, 2020 are primarily driven by termination costs as a result of the Merger, and restructuring charges for the nine months ended September 30, 2020 are primarily driven by employee termination costs due to reductions in force in response to the COVID-19 pandemic and termination costs as a result of the Merger.

The restructuring non-cash movements during the three and nine months ended September 30, 2021 primarily represent stock compensation costs recognized as a result of the modification of certain equity awards associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer.

Segments (as defined in Note 18)

The $1.9 million of restructuring charges for the three months ended September 30, 2021 includes $0.1 million of charges related to the NA Modular segment, $0.4 million of charges related to the NA Storage segment, and $1.4 million of unallocated charges.

The $3.9 million of restructuring charges for the three months ended September 30, 2020 includes $0.3 million of charges related to the NA Modular segment, $3.3 million of charges related to the NA Storage segment and $0.3 million of charges related to the UK Storage segment.

The $12.0 million of restructuring charges for the nine months ended September 30, 2021 includes $1.6 million of charges related to the NA Modular segment, $3.2 million of charges related to the NA Storage segment, and $7.2 million of unallocated charges.

The $4.5 million of restructuring charges for the nine months ended September 30, 2020 includes $0.9 million of charges pertaining to the NA Modular segment, $3.3 million of charges related to the NA Storage segment and $0.3 million of charges related to the UK Storage segment.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Prior to the Merger, stock awards were granted under the WillScot Corporation 2017 Incentive Award Plan (the "2017 Incentive Plan"), which included Restricted Stock Awards ("RSAs") and Restricted Stock Units ("RSUs"). On June 24, 2020, WillScot's stockholders approved the WillScot Mobile Mini 2020 Incentive Award Plan ("2020 Incentive Plan") to take effect pending completion of the Merger. The plan amended and restated in its entirety the 2017 Incentive Plan. As a result, all historical and future incentive awards to the Company's Board of Directors, executive officers and employees, as determined by the Company's Compensation Committee ("the Comp Committee"), are granted under the 2020 Incentive Plan. The 2020 Incentive Plan is administered by the Comp Committee. Under the 2020 Incentive Plan, the Comp Committee may grant an aggregate of 6,488,988 shares of Common Stock in the form of non-qualified stock options, incentive stock options, stock appreciation rights, RSAs, RSUs, performance compensation awards and stock bonus awards. Stock-based payments, including the grant of stock options, RSAs and RSUs, are subject to service-based vesting requirements, and expense is recognized on a straight-line basis over the vesting period. Forfeitures are accounted for as they occur.

Stock-based compensation expense includes grants of stock options, time-based RSUs ("Time-Based RSUs") and performance-based RSUs ("Performance-Based RSUs", together with Time-Based RSUs, the "RSUs"). The 2020 Incentive Plan continues the former Market-Based RSUs renamed as "Performance-Based RSUs." RSUs are recognized in the financial statements based on their fair value. In addition, stock-based payments to non-executive directors include grants of RSAs. Time-Based RSUs and RSAs are valued based on the intrinsic value of the difference between the exercise price, if any, of the award and the fair market value of WillScot Mobile Mini's Common Stock on the grant date. Performance-Based RSUs are valued based on a Monte Carlo simulation model to reflect the impact of the Performance-Based RSUs market condition. The probability of satisfying a market condition is considered in the estimation of the grant-date fair value for Performance-Based RSUs and the compensation cost is not reversed if the market condition is not achieved, provided the requisite service has been provided.

Restricted Stock Awards

The following table summarizes the Company's RSA activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	57,448	$	11.75	52,755	$	14.69
Granted	44,708	29.30		65,959	11.75
Forfeited	(8,532)	29.30		—	—
Vested	(57,448)	11.75		(61,266)	14.28
Balance September 30,	36,176	$	29.30	57,448	$	11.75

Compensation expense for RSAs recognized in SG&A on the condensed consolidated statements of operations was $0.3 million for each of the three months ended September 30, 2021 and 2020. Compensation expense for RSAs recognized in SG&A on the condensed consolidated statements of operations was $0.6 million and $0.7 million for the nine months ended

September 30, 2021 and 2020, respectively. At September 30, 2021, there was $0.7 million of unrecognized compensation cost related to RSAs that is expected to be recognized over the remaining weighted average vesting period of 0.7 years.

Time-Based RSUs

The following table summarizes the Company's Time-Based RSU activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	1,125,766	$	13.44	1,065,305	$	12.78
Granted	415,737	27.25		632,864	14.37
Forfeited	(65,153)	16.74		(22,728)	13.45
Vested	(467,055)	14.14		(323,678)	12.93
Balance September 30,	1,009,295	$	18.59	1,351,763	$	13.48

Compensation expense for Time-Based RSUs recognized in SG&A on the condensed consolidated statements of operations was $3.2 million and $1.6 million for the three months ended September 30, 2021 and 2020, respectively. Compensation expense for RSUs recognized in SG&A on the condensed consolidated statements of operations was $7.5 million and $3.9 million for the nine months ended September 30, 2021 and 2020, respectively. At September 30, 2021, unrecognized compensation cost related to Time-Based RSUs totaled $13.5 million and is expected to be recognized over the remaining weighted average vesting period of 2.3 years.

Included in restructuring costs for the three and nine months ended September 30, 2021 was expense of approximately $1.1 million and $5.9 million, respectively, recognized as a result of the modification of certain RSUs associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer.

Performance-Based RSUs

The following table summarizes the Company's Performance-Based RSU award activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	593,388	$	14.88	288,281	$	13.22
Granted	977,645	33.21		325,256	16.35
Forfeited	(20,077)	25.87		(12,700)	14.70
Balance September 30,	1,550,956	$	26.29	600,837	$	14.88

Compensation expense for Performance-Based RSUs recognized in SG&A on the condensed consolidated statements of operations was $2.7 million and $0.8 million for the three months ended September 30, 2021 and 2020, respectively. Compensation expense for Performance-Based RSUs recognized in SG&A on the condensed consolidated statements of operations was $5.8 million and $1.7 million for the nine months ended September 30, 2021 and 2020, respectively. At September 30, 2021, unrecognized compensation cost related to Performance-Based RSUs totaled $30.3 million and is expected to be recognized over the remaining vesting period of 2.7 years.

Included in restructuring costs for the three and nine months ended September 30, 2021 was expense of approximately $0.3 million and $1.3 million, respectively, recognized as a result of the modification of certain Performance-Based RSUs associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer.

Certain Performance-Based RSUs cliff vest based on achievement of the relative total stockholder return ("TSR") of the Company's Common Stock as compared to the TSR of the constituents in an index at the grant date over the performance period of three years. For certain 2021 grants, the TSR of the Company's Common Stock is compared to the TSR of the constituents in the S&P 400 Index. The target number of RSUs may be adjusted from 0% to 200% based on the TSR attainment levels defined by the Company's Compensation Committee. The 100% target payout is tied to performance at the 50% percentile, with a payout curve ranging from 0% (for performance less than the 25% percentile) to 200% (for performance above the 85% percentile). For grants in 2020 and prior, the TSR of the Company's Common Stock is compared to the TSR of constituents in the Russell 3000 Index. The target number of RSUs may be adjusted from 0% to 150% based on the TSR attainment levels defined by the Company's Compensation Committee. The 100% target payout is tied to performance at the

50% percentile, with a payout curve ranging from 0% (for performance less than the 25% percentile) to 150% (for performance at or above the 75% percentile).

For 555,790 Performance-Based RSUs granted in 2021, the awards cliff vest based on achievement of specified share prices of the Company's Common Stock at annual measurement dates over performance periods of 4.5 to 4.8 years. The target number of RSUs may be adjusted from 0 to 1,333,334 based on the stock price attainment levels defined by the Company's Compensation Committee. The 555,790 RSU target payout is tied to a stock price of $47.50, with a payout ranging from 0 RSUs (for a stock price less than $42.50) to 1,333,334 RSUs (for a stock price of $60.00 or greater).

Stock Options

The following table summarizes the Company's stock option activity as of September 30, 2021:

	WillScot Options	Weighted-Average Exercise Price per Share		Converted Mobile Mini Options	Weighted-Average Exercise Price per Share
Balance December 31 , 2020	534,188	$	13.60	2,031,455	$	14.78
Forfeited	—	—		(6,240)	12.19
Exercised	—	—		(484,986)	15.26
Balance September 30, 2021	534,188	$	13.60	1,540,229	$	14.65
Fully vested and exercisable options, September 30, 2021	400,641	$	13.60	1,540,229	$	14.65

The following table summarizes the Company's stock option activity as of September 30, 2020:

	WillScot Options	Weighted-Average Exercise Price per Share		Converted Mobile Mini Options	Weighted-Average Exercise Price per Share
Balance, December 31, 2019	534,188	$	13.60	—	$	—
Converted at Merger	—	—		7,361,516	13.52
Exercised	—	—		(259,708)	11.99
Balance at September 30, 2020	534,188	$	13.60	7,101,808	$	13.58
Fully vested and exercisable options, September 30, 2020	267,094	$	13.60	7,101,808	$	13.58

WillScot Options

Compensation expense for stock option awards, recognized in SG&A on the condensed consolidated statements of operations, was $0.2 million for each of the three months ended September 30, 2021 and 2020. Compensation expense for stock option awards, recognized in SG&A on the condensed consolidated statements of operations, was $0.6 million for each of the nine months ended September 30, 2021 and 2020. At September 30, 2021, unrecognized compensation cost related to stock option awards totaled $0.3 million and is expected to be recognized over the remaining vesting period of 0.5 years.

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Derivatives

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

Derivatives

On November 6, 2018, the Company entered into an interest rate swap agreement (the “Swap Agreement”) with a financial counterparty that effectively converts $400.0 million in aggregate notional amount of variable-rate debt under the Company’s ABL Facility into fixed-rate debt. The Swap Agreement will terminate on May 29, 2022. Under the terms of the Swap Agreement, the Company receives a floating rate equal to one-month LIBOR and makes payments based on a fixed rate of 3.06% on the notional amount. The receive rate under the terms of the Swap Agreement was 0.08% and 0.15% at September 30, 2021 and December 31, 2020, respectively.

The Swap Agreement was designated and qualified as a hedge of the Company’s exposure to changes in interest payment cash flows created by fluctuations in variable interest rates on the ABL Facility.

The location and the fair value of derivative instruments designated as hedges, at the respective balance sheet dates, were as follows:

(in thousands)	Balance Sheet Account	September 30, 2021		December 31, 2020
Cash Flow Hedges:
Interest rate swap	Accrued expenses	$	8,380	$	11,619
Interest rate swap	Other non-current liabilities	$	—	$	5,308

The fair value of the interest rate swap is based on dealer quotes of market forward rates, a Level 2 input on the fair value hierarchy, and reflects the amount that the Company would receive or pay as of September 30, 2021 and December 31, 2020, respectively, for contracts involving the same attributes and maturity dates.

The following table discloses the impact of the interest rate swap, excluding the impact of income taxes, on other comprehensive income (“OCI”), AOCI and the Company’s statements of operations for the nine months ended September 30,:

(in thousands)	2021		2020
Gain (loss) recognized in OCI	$	8,528	$	(5,061)
Location of gain (loss) recognized in income	Interest expense		Interest expense
Loss reclassified from AOCI into income (effective portion)	$	(8,967)	$	(7,147)

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Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company is involved in various lawsuits, claims and legal proceedings that arise in the ordinary course of business. The Company assesses these matters on a case-by-case basis as they arise and establishes reserves as required. As of September 30, 2021, with respect to these outstanding matters, the Company believes that the amount or range of reasonably possible loss will not, either individually or in the aggregate, have a material adverse effect on the consolidated financial position, results of operations, or cash flows. However, the outcome of such matters is inherently unpredictable and subject to significant uncertainties.

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Segment Reporting

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

The Company operates in four reportable segments as follows: North America Modular Solutions ("NA Modular"), North America Storage Solutions ("NA Storage"), United Kingdom Storage Solutions ("UK Storage") and Tank and Pump Solutions ("Tank and Pump"). Total assets for each reportable segment are not available because the Company utilizes a centralized approach to working capital management. Transactions between reportable segments are not significant.

In connection with the Merger, the Company determined its reportable segments as discussed above and retrospectively adjusted prior year's presentation to conform to the current presentation of reportable segments.

The Company defines EBITDA as net income (loss) plus interest (income) expense, income tax (benefit) expense, depreciation and amortization. The Company reflects the further adjustments to EBITDA ("Adjusted EBITDA") to exclude certain non-cash items and the effect of what the Company considers transactions or events not related to its core business operations. The Chief Operating Decision Maker ("CODM") evaluates business segment performance utilizing Adjusted EBITDA as shown in the reconciliation of the Company’s consolidated net income (loss) to Adjusted EBITDA below. Management believes that evaluating segment performance excluding such items is meaningful because it provides insight with respect to the intrinsic operating results of the Company.

The Company also regularly evaluates gross profit by segment to assist in the assessment of its operational performance. The Company considers Adjusted EBITDA to be the more important metric because it more fully captures the business performance of the segments, inclusive of indirect costs.

Reportable Segments

The following tables set forth certain information regarding each of the Company’s reportable segments for the three and nine months ended September 30, 2021 and 2020, respectively. Consistent with the financial statements, the segment results do not include Mobile Mini's operations prior to July 1, 2020. Please refer to the Management Discussion & Analysis of Financial Condition and Results of Operations included in this document, for pro forma results inclusive of Mobile Mini's financial results for periods prior to the Merger date.

	Three Months Ended September 30, 2021
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	219,736	$	101,172	$	21,691	$	20,797			$	363,396
Delivery and installation	58,017		28,330		5,563		7,789				99,699
Sales revenue:
New units	13,483		1,307		580		490				15,860
Rental units	7,815		3,088		265		429				11,597
Total revenues	299,051		133,897		28,099		29,505				490,552
Costs:
Cost of leasing and services:
Leasing	59,260		14,393		4,314		4,481				82,448
Delivery and installation	51,655		19,328		3,238		6,770				80,991
Cost of sales:
New units	10,080		727		368		324				11,499
Rental units	3,636		1,587		245		135				5,603
Depreciation of rental equipment	46,566		5,366		1,058		3,472				56,462
Gross profit	$	127,854	$	92,496	$	18,876	$	14,323			$	253,549
Other selected data:
Adjusted EBITDA	$	106,825	$	59,123	$	13,255	$	10,946	$	—	$	190,149
Selling, general and administrative expense (a)	$	66,529	$	38,740	$	6,680	$	6,955	$	14,823	$	133,727
Purchases of rental equipment and refurbishments	$	31,789	$	11,920	$	11,649	$	5,016	$	—	$	60,374

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

	Three Months Ended September 30, 2020
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	192,243	$	77,041	$	15,399	$	15,399			$	300,082
Delivery and installation	52,144		20,868		4,744		6,938				84,694
Sales revenue:
New units	14,024		3,783		1,011		542				19,360
Rental units	9,456		2,801		499		423				13,179
Total revenues	267,867		104,493		21,653		23,302				417,315
Costs:
Cost of leasing and services:
Leasing	49,516		9,260		3,382		2,630				64,788
Delivery and installation	44,465		13,120		3,240		5,529				66,354
Cost of sales:
New units	9,484		2,351		726		374				12,935
Rental units	6,356		1,930		466		85				8,837
Depreciation of rental equipment	45,967		4,448		1,168		3,254				54,837
Gross profit	$	112,079	$	73,384	$	12,671	$	11,430			$	209,564
Other selected data:
Adjusted EBITDA	$	100,281	$	46,465	$	8,306	$	8,507	$	—	$	163,559
Selling, general and administrative expense (a)	$	58,935	$	31,368	$	5,533	$	6,177	$	62,257	$	164,270
Purchases of rental equipment and refurbishments	$	34,249	$	7,234	$	677	$	431	$	—	$	42,591

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

	Nine Months Ended September 30, 2021
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	636,979	$	267,489	$	61,426	$	56,343			$	1,022,237
Delivery and installation	161,548		73,214		18,152		21,969				274,883
Sales revenue:
New units	27,814		5,355		2,746		1,908				37,823
Rental units	28,316		11,381		1,214		1,123				42,034
Total revenues	854,657		357,439		83,538		81,343				1,376,977
Costs:
Cost of leasing and services:
Leasing	172,108		37,300		13,339		12,628				235,375
Delivery and installation	147,514		51,811		10,638		18,317				228,280
Cost of sales:
New units	19,330		3,190		1,802		1,338				25,660
Rental units	14,611		6,667		1,163		429				22,870
Depreciation of rental equipment	144,102		17,635		3,290		10,026				175,053
Gross profit	$	356,992	$	240,836	$	53,306	$	38,605			$	689,739
Other selected data:
Adjusted EBITDA	$	307,741	$	154,971	$	36,647	$	29,870	$	—	$	529,229
Selling, general and administrative expense (a)	$	192,285	$	103,501	$	19,949	$	18,868	$	38,840	$	373,443
Purchases of rental equipment and refurbishments	$	120,288	$	24,165	$	22,645	$	11,093	$	—	$	178,191

(a) Includes both SG&A expense and Transaction costs from the consolidated statement of operations.

	Nine Months Ended September 30, 2020
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	570,738	$	77,041	$	15,399	$	15,399			$	678,577
Delivery and installation	154,854		20,868		4,744		6,938				187,404
Sales revenue:
New units	33,400		3,783		1,011		542				38,736
Rental units	21,558		2,801		499		423				25,281
Total revenues	780,550		104,493		21,653		23,302				929,998
Costs:
Cost of leasing and services:
Leasing	147,072		9,260		3,382		2,630				162,344
Delivery and installation	131,853		13,120		3,240		5,529				153,742
Cost of sales:
New units	22,018		2,351		726		374				25,469
Rental units	13,965		1,930		466		85				16,446
Depreciation of rental equipment	137,409		4,448		1,168		3,254				146,279
Gross profit	$	328,233	$	73,384	$	12,671	$	11,430			$	425,718
Other selected data:
Adjusted EBITDA	$	287,345	$	46,465	$	8,306	$	8,507	$	—	$	350,623
Selling, general and administrative expense (a)	$	180,791	$	31,368	$	5,533	$	6,177	$	80,641	$	304,510
Purchases of rental equipment and refurbishments	$	113,931	$	7,234	$	677	$	431	$	—	$	122,273

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

The following tables present a reconciliation of the Company’s income (loss) from operations to Adjusted EBITDA for the three and nine months ended September 30, 2021 and 2020, respectively:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Net income (loss)	$	61,103	$	(6,051)	$	85,921	$	71,474
Income tax expense (benefit)	6,644		(66,675)		35,953		(66,170)
Loss on extinguishment of debt	—		42,401		5,999		42,401
Fair value loss (gain) on common stock warrant liabilities	—		22,303		26,597		(46,063)
Interest expense	29,201		33,034		88,377		89,810
Depreciation and amortization	75,276		71,704		233,813		169,103
Currency losses (gains), net	127		(371)		196		147
Restructuring costs, lease impairment expense and other related charges	2,457		4,798		14,286		8,542
Transaction costs	303		52,191		1,147		63,241
Integration costs	8,247		7,083		23,211		10,921
Stock compensation expense	6,259		2,944		14,480		6,958
Other	532		198		(751)		259
Adjusted EBITDA	$	190,149	$	163,559	$	529,229	$	350,623

Included in restructuring costs for the three and nine months ended September 30, 2021 was expense of approximately $1.4 million and $7.2 million, respectively, recognized as a result of the modification of certain equity awards associated with the Transition, Separation and Release Agreement entered into on February 25, 2021 with the Company's former President and Chief Operating Officer. For the nine months ended September 30, 2021, stock-based compensation expense reported in the Statement of Cash Flows included these charges.

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Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Earnings (Loss) Per Share

Basic earnings (loss) per share (“EPS”) is calculated by dividing net income (loss) attributable to WillScot Mobile Mini by the weighted average number of shares of Common Stock outstanding during the period. The shares of Common Stock issued as a result of the vesting of RSUs and RSAs as well as the exercise of stock options or redemption of warrants were included in EPS based on the weighted average number of days in which they were vested and outstanding during the period.

Prior to June 30, 2020, the Company had shares of Class B Common Stock which had no rights to dividends or distributions made by the Company and, in turn, were excluded from the EPS calculation. On June 30, 2020, the Sapphire Exchange was completed, and all shares of Class B Common Stock were cancelled, and Sapphire Holdings received 10,641,182 shares of Common Stock.

Diluted EPS is computed similarly to basic EPS, except that it includes the potential dilution that would occur if dilutive securities were exercised. Effects of potentially dilutive securities are presented only in periods in which they are dilutive. When liability-classified warrants are in the money and the impact of their inclusion on diluted EPS is dilutive, diluted EPS also assumes share settlement of such instruments through an adjustment to net income available to common stockholders for the fair value (gain) loss on common stock warrant liabilities and inclusion of the number of dilutive shares in the denominator.

The following table reconciles net income attributable to WillScot Mobile Mini common shareholders and the weighted average shares outstanding for the basic calculation to the weighted average shares outstanding for the diluted calculation:

	Three Months Ended				Nine Months Ended
	September 30				September 30
(in thousands)	2021		2020		2021		2020
Numerator:
Net income (loss) attributable to common shareholders - basic	$	61,103	$	(6,051)	$	85,921	$	70,261
Fair value gain on common stock warrant liabilities	—		—		—		(47,718)
Net income (loss) attributable to common shareholders - dilutive	$	61,103	$	(6,051)	$	85,921	$	22,543
Denominator:
Weighted average Common Shares outstanding - basic	225,998		226,650		227,558		149,283
Dilutive effect of shares outstanding
Warrants	3,722		—		4,112		2,122
RSAs	4		—		25		31
Time-based RSUs	476		—		573		314
Performance-based RSUs	618		—		751		272
Stock Options	1,050		—		1,066		411
Weighted average Common Shares outstanding - dilutive	231,868		226,650		234,085		152,433

The following potential common shares were excluded from the computation of dilutive EPS because their effect would have been anti-dilutive:

	Three Months Ended		Nine Months Ended
	September 30		September 30
(in thousands)	2021	2020	2021	2020
Warrants	—	18,758	—	—
RSAs	—	57	—	—
Time-based RSUs	—	1,352	—	—
Performance-based RSUs	—	184	—	—
Stock Options	—	7,630	—	—

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Related Parties

9 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Related Parties

Related Parties

Related party balances included in the Company’s condensed consolidated balance sheets at September 30, 2021 and December 31, 2020, consisted of the following:

(in thousands)	Financial Statement Line Item	September 30, 2021		December 31, 2020
Receivables due from affiliates	Trade receivables, net of allowances for credit losses	$	433	$	30
Amounts due to affiliates	Accrued expenses	(392)		(461)
Total related party liabilities, net		$	41	$	(431)

Related party transactions included in the Company’s condensed consolidated statements of operations for the three and nine months ended September 30, 2021 and 2020, respectively, consisted of the following:

		Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	Financial Statement Line Item	2021		2020		2021		2020
Leasing revenue from related parties	Leasing revenue	$	541	$	504	$	706	$	1,330
Consulting expense to related party	Selling, general & administrative expense	(1,511)		(1,738)		(3,660)		(4,733)
Total related party expense, net		$	(970)	$	(1,234)	$	(2,954)	$	(3,403)

On June 30, 2020, the Company completed the Sapphire Exchange, whereby Sapphire Holdings, an affiliate of TDR Capital, exchanged shares of Class B Common Stock for 10,641,182 shares of Class A Common Stock. As a result of the Sapphire Exchange, all issued and outstanding shares of WillScot’s Class B Common Stock were automatically canceled for no consideration and the existing exchange agreement was automatically terminated.

On August 22, 2018, WillScot’s principal stockholder, Sapphire Holdings, entered into a margin loan (the "Margin Loan") under which all of its shares of WillScot Mobile Mini Common Stock were pledged to secure borrowings of up to $125.0 million under the loan agreement. WillScot Mobile Mini was not a party to the loan agreement and had no obligations thereunder. On June 29, 2021, Sapphire Holdings repaid all outstanding amounts under the Margin Loan with proceeds from the sale of certain shares of WillScot Mobile Mini and no WillScot Mobile Mini shares remain pledged thereunder.

On March 1, 2021, the Company repurchased from Sapphire Holdings and cancelled 2,750,000 shares of its Common Stock. On June 29, 2021, the Company repurchased from Sapphire Holdings and cancelled an additional 3,900,000 shares of its Common Stock. Following the reduction in Sapphire Holdings’ beneficial ownership of Common Stock resulting from the foregoing repurchases and the underwritten secondary offering by Sapphire Holdings of 16,100,000 shares of Common Stock on June 25, 2021, Gary Lindsay resigned his position as a member of the WillScot Mobile Mini board of directors pursuant to the terms of the shareholders agreement dated July 1, 2020 between Sapphire Holdings, TDR Capital II Holdings L.P., TDR Capital, L.L.P. and WillScot Mobile Mini.

On September 9, 2021, the Company repurchased from Sapphire Holdings and cancelled an additional 2,379,839 shares of its common stock, and Sapphire Holdings sold its remaining 21,410,019 shares through an underwritten secondary offering. Following the reduction in Sapphire Holdings' beneficial ownership of Common Stock resulting from the foregoing repurchase and secondary offering, Stephen Robertson resigned his position as a member of the Willscot Mobile Mini board of directors pursuant to the aforementioned shareholders agreement dated July 1, 2020, and Sapphire Holdings, TDR Capital II Holdings L.P. and TDR Capital, L.L.P. ceased to be related parties of WillScot Mobile Mini.

The Company purchased rental equipment from former related party affiliates for $1.0 million for the three months ended September 30, 2020. The Company purchased rental equipment from related party affiliates of $2.5 million and $2.6 million for the nine months ended September 30, 2021 and 2020, respectively.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Quarterly Report on Form 10-Q and do not include all the information and notes required by GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements comprise the financial statements of WillScot Mobile Mini and its subsidiaries that it controls due to ownership of a majority voting interest and contain all adjustments, which are of a normal and recurring nature, necessary to present fairly the financial position, results of operations and cash flows for the interim periods presented.

Principles of Consolidation

Subsidiaries are fully consolidated from the date of acquisition, being the date on which the Company obtains control, and continue to be consolidated until the date when such control ceases. The financial statements of the subsidiaries are prepared for the same reporting period as the Company. All intercompany balances and transactions are eliminated.

Reclassifications

Reclassifications

Certain reclassifications have been made to prior year financial statements to conform to the current year presentation.

Recently Issued and Adopted Accounting Standards

Recently Issued Accounting Standards

In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848), which is elective, and provides for optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The Company is currently evaluating the impact of reference rate reform and the potential impact of adoption of these elective practical expedients on its consolidated financial statements and does not expect the impact to be material.

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40). The new ASU eliminates the beneficial conversion and cash conversion accounting models for convertible instruments. It also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, the new guidance modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The amendments in the ASU are effective for public entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. The Company does not expect the adoption of this pronouncement to have a material impact on its consolidated financial statements.

Recently Adopted Accounting StandardsIn December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which removes certain exceptions to the general principles for income taxes and also improves consistent application of accounting by clarifying or amending existing guidance. On January 1, 2021, the Company adopted ASU 2019-12 and the impact of adoption was not material to the Company's consolidated financial statements. The Company applied the standard prospectively for intraperiod tax allocation, year-to-date losses that exceed anticipated annual losses and enacted changes in tax laws.

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Acquisitions (Tables)

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Schedule of Acquisition

The purchase price was determined as follows:

(in thousands, except share and per share data)	July 1, 2020
Mobile Mini Common Stock outstanding	44,252,275
Share conversion ratio	2.405
Common Stock issued	106,426,721
Common Stock per share price as of July 1, 2020	$	12.53
Fair value of shares of WillScot Class A Common Stock issued	$	1,333,527
Cash paid for fractional shares	30
Fair value of Mobile Mini Options converted to WillScot Mobile Mini Options	19,279
Total purchase price	$	1,352,836

The following table summarizes the July 1, 2020 fair values of the assets acquired and liabilities assumed.

Opening Balance Sheet

(in thousands)	July 1, 2020
Cash and cash equivalents	$	17,203
Trade receivables	87,492
Inventories	8,987
Prepaid expenses and other current assets	13,717
Rental equipment	1,032,672
Property, plant and equipment	160,729
Operating lease assets	92,054
Intangible assets	374,500
Goodwill identified	937,135
Other non-current assets	2,520
Total identifiable assets acquired	2,727,009
Accounts payable	(29,797)
Accrued expenses	(40,335)
Deferred revenue and customer deposits	(38,846)
Operating lease liabilities	(89,968)
Debt and finance lease liabilities	(897,244)
Deferred tax liabilities	(276,555)
Other long-term liabilities	(1,428)
Total liabilities assumed	(1,374,173)
Purchase Price	$	1,352,836

Schedule of Unaudited Pro Forma Information

The tables below present unaudited pro forma condensed combined statement of operations information for the nine months ended September 30, 2020:

(in thousands)	Nine Months Ended September 30, 2020
WillScot revenues	$	929,998
Mobile Mini revenues	284,240
Pro forma revenues	$	1,214,238
WillScot Mobile Mini income before income tax	$	5,304	(a)
Mobile Mini income before income tax	37,875
Pro forma income before income tax	43,179
Pro forma adjustments to combined income before income tax:
Elimination of Merger transaction costs	80,040		(b)
Impact of fair value mark-ups on rental fleet depreciation	(2,334)		(c)
Other depreciation expense and intangible asset amortization	(11,397)		(d)
Interest expense	(6,113)		(e)
Elimination of Mobile Mini interest expense	15,921		(f)
Elimination of loss on extinguishment of debt	19,682		(g)
Pro forma income before income tax	138,978
Income tax expense	22,300		(h)
Pro forma net income	$	116,678

(a)	Excludes impact of non-controlling interest which was eliminated as part of the Sapphire Exchange. See Note 10.
(b)	Eliminates discrete transaction costs incurred as a result of the Mobile Mini Merger.
(c)	Depreciation on rental equipment and property, plant and equipment were adjusted for the determination of the fair value of equipment acquired in the Mobile Mini Merger.
(d)	Represents the differential in other depreciation and amortization expense related to the fair value purchase accounting adjustments as a result of the Merger, principally the amortization of the Mobile Mini customer relationship valued at $209.0 million.
(e)	In connection with the Merger, the Company entered into a new ABL Facility and drew $1.47 billion at close with an estimated interest rate of 2.046%, issued the 2025 Secured Notes at 6.125%, repaid the 2022 Secured Notes and repaid the 2017 ABL Facility. Interest and amortization of deferred financing fees for the 2020 ABL Facility and the 2025 Secured Notes has been included offset by the removal of interest and amortization of deferred financing fees attributable to the 2022 Secured Notes and the 2017 ABL Facility. See Note 9 for definitions of terms.
(f)	Interest and amortization of deferred financing fees on the senior notes and line of credit maintained by Mobile Mini which were assumed at acquisition and repaid immediately using proceeds from the 2020 ABL Facility and 2025 Secured Notes was eliminated.
(g)	Elimination of loss on extinguishment of debt in connection with the redemption premium on the 2022 Secured Notes and unamortized deferred financing costs on the 2022 Secured Notes and 2017 ABL Facility. See Note 9 for definitions of terms.
(h)	Reflects the recorded income tax provision plus the adjustment to recognize the income tax impacts of the unaudited pro forma adjustments for which a tax expense is recognized using a US federal and state statutory tax rate of 25.5%. This rate may vary from the effective tax rates of the historical and combined businesses. In addition, the three and nine months ended September 30, 2020 included adjustments of $54.1 million and $56.8 million, respectively, to eliminate the reversal of valuation allowance as a result of reassessment of the realizability of deferred tax assets as a result of the Merger.

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Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The Company had total revenue in the following geographic areas for the three and nine months ended September 30, 2020 as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
US	$	427,251	$	368,285	$	1,197,800	$	841,227
Canada	31,536		24,098		84,663		57,083
Mexico	3,666		3,279		10,977		10,035
UK	28,099		21,653		83,537		21,653
Total revenues	$	490,552	$	417,315	$	1,376,977	$	929,998

The Company’s revenue by major product and service line for the three and nine months ended September 30, 2021 was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Modular space leasing revenue	$	188,507	$	163,635	$	539,835	$	427,409
Portable storage leasing revenue	66,184		52,941		179,645		64,506
Tank and pump leasing revenue	19,040		14,112		51,909		14,112
VAPS and third party leasing revenues(a)	73,517		56,330		206,823		139,754
Other leasing-related revenue(b)	16,148		13,064		44,025		32,796
Leasing revenue	363,396		300,082		1,022,237		678,577
Delivery and installation revenue	99,699		84,694		274,883		187,404
Total leasing and services revenue	463,095		384,776		1,297,120		865,981
New unit sales revenue	15,860		19,360		37,823		38,736
Rental unit sales revenue	11,597		13,179		42,034		25,281
Total revenues	$	490,552	$	417,315	$	1,376,977	$	929,998

(a)	Includes $7.2 million and $5.6 million of service revenue for the three months ended September 30, 2021 and 2020, respectively, and $21.2 million and $13.9 million of service revenue for the nine months ended September 30, 2021 and 2020, respectively.
(b)	Includes primarily damage billings, delinquent payment charges, and other processing fees.

Schedule of Accounts and Notes Receivable Allowances

Activity in the allowance for credit losses was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Balance at beginning of period	$	36,785	$	19,183	$	29,258	$	15,828
Net charges to bad debt expense and revenue	9,751		13,062		26,661		22,184
Write-offs	(4,543)		(6,822)		(14,415)		(12,395)
Foreign currency translation and other	(126)		(1,237)		363		(1,431)
Balance at end of period	$	41,867	$	24,186	$	41,867	$	24,186

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Leases (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Lessee, Operating Lease, Liability, Maturity

As of September 30, 2021, the undiscounted future lease payments for operating and finance lease liabilities were as follows:

(in thousands)	Operating		Finance
2021 (remaining)	$	16,246	$	5,520
2022	60,038		20,012
2023	49,165		16,561
2024	40,555		13,639
2025	33,371		13,747
Thereafter	76,957		22,841
Total lease payments	276,332		92,320
Less: interest	(42,745)		(6,720)
Present value of lease liabilities	$	233,587	$	85,600

Finance Lease, Liability, Fiscal Year Maturity

As of September 30, 2021, the undiscounted future lease payments for operating and finance lease liabilities were as follows:

(in thousands)	Operating		Finance
2021 (remaining)	$	16,246	$	5,520
2022	60,038		20,012
2023	49,165		16,561
2024	40,555		13,639
2025	33,371		13,747
Thereafter	76,957		22,841
Total lease payments	276,332		92,320
Less: interest	(42,745)		(6,720)
Present value of lease liabilities	$	233,587	$	85,600

Lease Activity

The Company’s lease activity during the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Financial Statement Line	2021		2020
Finance Lease Expense
Amortization of finance lease assets	$	14,231	$	4,360
Interest on obligations under finance leases	1,674		512
Total finance lease expense	$	15,905	$	4,872
Operating Lease Expense
Fixed lease expense
Cost of leasing and services	$	3,019	$	4,444
Selling, general and administrative	44,732		29,682
Lease impairment expense and other related charges	1,571		2,103
Short-term lease expense
Cost of leasing and services	17,751		19,765
Selling, general and administrative	680		1,612
Lease impairment expense and other related charges	0		471
Variable lease expense
Cost of leasing and services	5,442		5,277
Selling, general and administrative	5,702		3,645
Lease impairment expense and other related charges	402		666
Total operating lease expense	$	79,299	$	67,665

Supplemental cash flow information related to leases for the nine months ended September 30, 2021 and 2020 was as follows:

(in thousands)	Nine Months Ended September 30,
Supplemental Cash Flow Information	2021		2020
Cash paid for the amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	48,403	$	35,065
Operating cash outflows from finance leases	$	1,669	$	491
Financing cash outflows from finance leases	$	12,388	$	3,434
Right of use assets obtained in exchange for lease obligations	$	43,448	$	26,727
Assets obtained in exchange for finance leases	$	19,947	$	6,322

Weighted-Average Remaining Operating Lease Term and Weighted Average Discount Rate

Weighted-average remaining operating lease terms and the weighted average discount rates as of September 30, 2021 and December 31, 2020 were as follows:

Lease Terms and Discount Rates	September 30, 2021		December 31, 2020
Weighted-average remaining lease term - operating leases	6.0 years		6.4 years
Weighted-average discount rate - operating leases	5.3	%	5.7	%
Weighted-average remaining lease term - finance leases	4.5 years		4.6 years
Weighted-average discount rate - finance leases	2.9	%	2.9	%

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Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories at the respective balance sheet dates consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Raw materials	$	24,472	$	19,560
Finished units	6,471		4,171
Inventories	$	30,943	$	23,731

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Rental Equipment, net (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of Rental Equipment, net

Rental equipment, net at the respective balance sheet dates consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Modular space units	$	2,901,998	$	2,796,284
Portable storage units	716,033		653,707
Tank and pump products	149,123		132,071
Value added products	158,336		143,652
Total rental equipment	3,925,490		3,725,714
Less: accumulated depreciation	(956,595)		(794,068)
Rental equipment, net	$	2,968,895	$	2,931,646

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Goodwill (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill Activity

Changes in the carrying amount of goodwill were as follows:

(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Total
Balance at December 31, 2019	$	235,177	$	—	$	—	$	—	$	235,177
Acquisition of Mobile Mini	—		726,529		59,183		143,262		928,974
Effects of movements in foreign exchange rates	651		—		6,417		—		7,068
Balance at December 31, 2020	235,828		726,529		65,600		143,262		1,171,219
Changes to Mobile Mini purchase accounting	285,000		(233,666)		—		(43,173)		8,161
Effects of movements in foreign exchange rates	113		(311)		(910)		18		(1,090)
Balance at September 30, 2021	$	520,941	$	492,552	$	64,690	$	100,107	$	1,178,290

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Intangible (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Indefinite-Lived Intangible Assets

Intangible assets other than goodwill at the respective balance sheet dates consisted of the following:

	September 30, 2021
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	—	$	3,000	$	(3,000)	$	—
Mobile Mini customer relationships	6.8	209,000		(31,898)		177,102
Technology	4.8	1,500		(313)		1,187
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	502,500	$	(35,211)	$	467,289

	December 31, 2020
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	0.7	$	3,000	$	(2,375)	$	625
Mobile Mini customer relationships	8.0	217,000		(12,053)		204,947
Technology	5.5	1,500		(125)		1,375
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	510,500	$	(14,553)	$	495,947

Schedule of Finite-Lived Intangible Assets

Intangible assets other than goodwill at the respective balance sheet dates consisted of the following:

	September 30, 2021
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	—	$	3,000	$	(3,000)	$	—
Mobile Mini customer relationships	6.8	209,000		(31,898)		177,102
Technology	4.8	1,500		(313)		1,187
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	502,500	$	(35,211)	$	467,289

	December 31, 2020
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:
Trade name - ModSpace	0.7	$	3,000	$	(2,375)	$	625
Mobile Mini customer relationships	8.0	217,000		(12,053)		204,947
Technology	5.5	1,500		(125)		1,375
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	510,500	$	(14,553)	$	495,947

Schedule of Future Amortization of Intangible Assets

Based on the carrying value at September 30, 2021, future amortization of intangible assets is expected to be as follows for the years ended December 31:

(in thousands)
2021 (remaining)	$	6,604
2022	26,416
2023	26,416
2024	26,416
2025	26,416
Thereafter	66,021
Total	$	178,289

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Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Debt

The carrying value of debt outstanding at the respective balance sheet dates consisted of the following:

(in thousands, except rates)	Interest rate	Year of maturity	September 30, 2021		December 31, 2020
2025 Secured Notes	6.125%	2025	$	517,581	$	637,068
ABL Facility(a)	Varies	2025	1,521,518		1,263,833
2028 Secured Notes	4.625%	2028	492,253		491,555
Finance Leases	Varies	Varies	85,600		77,874
Total debt			2,616,952		2,470,330
Less: current portion of long-term debt			18,652		16,521
Total long-term debt			$	2,598,300	$	2,453,809

(a) As of both September 30, 2021 and December 31, 2020, the Company had no outstanding principal borrowings on the Multicurrency Facility and $6.6 million and $7.9 million, respectively, of related debt issuance costs. No related debt issuance costs were recorded as a direct offset against the principal borrowings on the Multicurrency Facility, and the $6.6 million and $7.9 million in excess of principal was included in other non-current assets on the condensed consolidated balance sheets.

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Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) ("AOCI"), net of tax, for the nine months ended September 30, 2021 and 2020 were as follows:

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2020	$	(24,694)	$	(12,513)	$	(37,207)
Other comprehensive income (loss) before reclassifications	5,034		(760)		4,274
Reclassifications from AOCI to income	—		2,937		2,937
Balance at March 31, 2021	(19,660)		(10,336)		(29,996)
Other comprehensive income (loss) before reclassifications	3,093		(848)		2,245
Reclassifications from AOCI to income	—		2,994		2,994
Balance at June 30, 2021	(16,567)		(8,190)		(24,757)
Other comprehensive loss before reclassifications	(11,162)		(830)		(11,992)
Reclassifications from AOCI to income	—		3,036		3,036
Balance at September 30, 2021	$	(27,729)	$	(5,984)	$	(33,713)

(in thousands)	Foreign currency translation		Unrealized losses on hedging activities		Total
Balance at December 31, 2019	$	(52,982)	$	(9,793)	$	(62,775)
Other comprehensive loss before reclassifications	(21,144)		(10,330)		(31,474)
Reclassifications from AOCI to income	—		1,572		1,572
Less other comprehensive loss attributable to non-controlling interest	1,913		790		2,703
Balance at March 31, 2020	(72,213)		(17,761)		(89,974)
Other comprehensive income (loss) before reclassifications	7,982		(1,642)		6,340
Reclassifications from AOCI to income	—		2,617		2,617
Less other comprehensive income attributable to non-controlling interest	(730)		(88)		(818)
Impact of elimination of non-controlling interest on accumulated other comprehensive income	(1,299)		(1,673)		(2,972)
Balance at June 30, 2020	(66,260)		(18,547)		(84,807)
Other comprehensive income prior to reclassifications	14,619		947		15,566
Reclassifications from AOCI to income	—		2,958		2,958
Balance at September 30, 2020	$	(51,641)	$	(14,642)	$	(66,283)

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Warrants (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Fair Value of Outstanding Warrants Recorded as Liabilities

The Company determined the following fair values for the outstanding common stock warrants recorded as liabilities:

(in thousands)	September 30, 2021	December 31, 2020
2015 Private Warrants	N/A	$	77,404

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Fair Value Measures (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Carrying Amounts and Fair Values of Financial Assets and Liabilities

The following table shows the carrying amounts and fair values of financial liabilities which are disclosed, but not measured, at fair value, including their levels in the fair value hierarchy:

	September 30, 2021								December 31, 2020
	Carrying Amount		Fair Value						Carrying Amount		Fair Value
(in thousands)			Level 1		Level 2		Level 3				Level 1		Level 2		Level 3
ABL Facilities	$	1,521,518	$	—	$	1,555,500	$	—	$	1,263,833	$	—	$	1,304,612	$	—
2025 Secured Notes	517,581		—		556,374		—		637,068		—		694,876		—
2028 Secured Notes	492,253		—		521,435		—		491,555		—		518,820		—
Total	$	2,531,352	$	—	$	2,633,309	$	—	$	2,392,456	$	—	$	2,518,308	$	—

The following table shows the carrying amounts and fair values of financial liabilities which are measured at fair value:

	September 30, 2021								December 31, 2020
	Carrying Amount		Fair Value						Carrying Amount		Fair Value
(in thousands)			Level 1		Level 2		Level 3				Level 1		Level 2		Level 3
2015 Private warrants	N/A		N/A		N/A		N/A		$	77,404	$	—	$	—	$	77,404
Total	$	—	$	—	$	—	$	—	$	77,404	$	—	$	—	$	77,404

Quantitative Information Regarding Level 3 Fair Value Measurements

The following table provides quantitative information regarding Level 3 fair value measurements:

	December 31, 2020
(in thousands)	2015 Private Warrants
Stock Price	$	23.17
Strike Price	$	11.50
Expected Life	1.91
Volatility	41.2		%
Risk Free rate	0.13		%
Dividend yield	—
Fair value of warrants	$	12.17

Changes in Level 3 Liabilities Measured at Fair Value

The following table presents changes in Level 3 liabilities measured at fair value for the three months ended September 30, 2020:

(in thousands)	2015 Private Warrants
Balance - June 30, 2020	$	34,421
Measurement adjustment	22,303
Balance - September 30, 2020	$	56,724

The following table presents changes in Level 3 liabilities measured at fair value for the nine months ended September 30, 2021 and September 30, 2020.

(in thousands)	2015 Private Warrants
Balance - December 31, 2020	$	77,404
Exercise or conversion	(78,495)
Measurement adjustment	25,486
Repurchases	(24,395)
Balance - September 30, 2021	$	—

(in thousands)	2015 Private Warrants		2018 Warrants
Balance - December 31, 2019	$	72,705	$	58,369
Exercise or conversion	—		(416)
Measurement adjustment	(15,981)		(31,737)
Reclassification to equity at June 30, 2020	—		(26,216)
Balance - September 30, 2020	$	56,724	$	—

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Restructuring (Tables)

9 Months Ended

Sep. 30, 2021

Restructuring and Related Activities [Abstract]

Summary of Activities in the Restructuring Accruals

The following is a summary of the activity in the Company’s restructuring accruals for the three and nine months ended September 30, 2021 and 2020, which primarily relate to employee costs:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands)	2021		2020		2021		2020
Beginning balance	$	4,380	$	525	$	1,750	$	447
Charges	1,856		3,854		11,958		4,543
Cash payments	(3,845)		(2,432)		(5,548)		(3,027)
Foreign currency translation	—		2		—		3
Non-cash movements	(1,442)		133		(7,211)		116
Ending balance	$	949	$	2,082	$	949	$	2,082

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Restricted Stock Awards

The following table summarizes the Company's RSA activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	57,448	$	11.75	52,755	$	14.69
Granted	44,708	29.30		65,959	11.75
Forfeited	(8,532)	29.30		—	—
Vested	(57,448)	11.75		(61,266)	14.28
Balance September 30,	36,176	$	29.30	57,448	$	11.75

Restricted Stock Units

The following table summarizes the Company's Time-Based RSU activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	1,125,766	$	13.44	1,065,305	$	12.78
Granted	415,737	27.25		632,864	14.37
Forfeited	(65,153)	16.74		(22,728)	13.45
Vested	(467,055)	14.14		(323,678)	12.93
Balance September 30,	1,009,295	$	18.59	1,351,763	$	13.48

The following table summarizes the Company's Performance-Based RSU award activity as of September 30,:

	2021			2020
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Balance December 31,	593,388	$	14.88	288,281	$	13.22
Granted	977,645	33.21		325,256	16.35
Forfeited	(20,077)	25.87		(12,700)	14.70
Balance September 30,	1,550,956	$	26.29	600,837	$	14.88

Stock Option Awards

The following table summarizes the Company's stock option activity as of September 30, 2021:

	WillScot Options	Weighted-Average Exercise Price per Share		Converted Mobile Mini Options	Weighted-Average Exercise Price per Share
Balance December 31 , 2020	534,188	$	13.60	2,031,455	$	14.78
Forfeited	—	—		(6,240)	12.19
Exercised	—	—		(484,986)	15.26
Balance September 30, 2021	534,188	$	13.60	1,540,229	$	14.65
Fully vested and exercisable options, September 30, 2021	400,641	$	13.60	1,540,229	$	14.65

The following table summarizes the Company's stock option activity as of September 30, 2020:

	WillScot Options	Weighted-Average Exercise Price per Share		Converted Mobile Mini Options	Weighted-Average Exercise Price per Share
Balance, December 31, 2019	534,188	$	13.60	—	$	—
Converted at Merger	—	—		7,361,516	13.52
Exercised	—	—		(259,708)	11.99
Balance at September 30, 2020	534,188	$	13.60	7,101,808	$	13.58
Fully vested and exercisable options, September 30, 2020	267,094	$	13.60	7,101,808	$	13.58

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Derivatives (Tables)

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Instruments Designated as Hedges in the Consolidated Balance Sheet

The location and the fair value of derivative instruments designated as hedges, at the respective balance sheet dates, were as follows:

(in thousands)	Balance Sheet Account	September 30, 2021		December 31, 2020
Cash Flow Hedges:
Interest rate swap	Accrued expenses	$	8,380	$	11,619
Interest rate swap	Other non-current liabilities	$	—	$	5,308

Schedule of Impact of Interest Rate Swap on Other Comprehensive Income, AOCI and Statement of Operations

The following table discloses the impact of the interest rate swap, excluding the impact of income taxes, on other comprehensive income (“OCI”), AOCI and the Company’s statements of operations for the nine months ended September 30,:

(in thousands)	2021		2020
Gain (loss) recognized in OCI	$	8,528	$	(5,061)
Location of gain (loss) recognized in income	Interest expense		Interest expense
Loss reclassified from AOCI into income (effective portion)	$	(8,967)	$	(7,147)

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Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables set forth certain information regarding each of the Company’s reportable segments for the three and nine months ended September 30, 2021 and 2020, respectively. Consistent with the financial statements, the segment results do not include Mobile Mini's operations prior to July 1, 2020. Please refer to the Management Discussion & Analysis of Financial Condition and Results of Operations included in this document, for pro forma results inclusive of Mobile Mini's financial results for periods prior to the Merger date.

	Three Months Ended September 30, 2021
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	219,736	$	101,172	$	21,691	$	20,797			$	363,396
Delivery and installation	58,017		28,330		5,563		7,789				99,699
Sales revenue:
New units	13,483		1,307		580		490				15,860
Rental units	7,815		3,088		265		429				11,597
Total revenues	299,051		133,897		28,099		29,505				490,552
Costs:
Cost of leasing and services:
Leasing	59,260		14,393		4,314		4,481				82,448
Delivery and installation	51,655		19,328		3,238		6,770				80,991
Cost of sales:
New units	10,080		727		368		324				11,499
Rental units	3,636		1,587		245		135				5,603
Depreciation of rental equipment	46,566		5,366		1,058		3,472				56,462
Gross profit	$	127,854	$	92,496	$	18,876	$	14,323			$	253,549
Other selected data:
Adjusted EBITDA	$	106,825	$	59,123	$	13,255	$	10,946	$	—	$	190,149
Selling, general and administrative expense (a)	$	66,529	$	38,740	$	6,680	$	6,955	$	14,823	$	133,727
Purchases of rental equipment and refurbishments	$	31,789	$	11,920	$	11,649	$	5,016	$	—	$	60,374

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

	Three Months Ended September 30, 2020
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	192,243	$	77,041	$	15,399	$	15,399			$	300,082
Delivery and installation	52,144		20,868		4,744		6,938				84,694
Sales revenue:
New units	14,024		3,783		1,011		542				19,360
Rental units	9,456		2,801		499		423				13,179
Total revenues	267,867		104,493		21,653		23,302				417,315
Costs:
Cost of leasing and services:
Leasing	49,516		9,260		3,382		2,630				64,788
Delivery and installation	44,465		13,120		3,240		5,529				66,354
Cost of sales:
New units	9,484		2,351		726		374				12,935
Rental units	6,356		1,930		466		85				8,837
Depreciation of rental equipment	45,967		4,448		1,168		3,254				54,837
Gross profit	$	112,079	$	73,384	$	12,671	$	11,430			$	209,564
Other selected data:
Adjusted EBITDA	$	100,281	$	46,465	$	8,306	$	8,507	$	—	$	163,559
Selling, general and administrative expense (a)	$	58,935	$	31,368	$	5,533	$	6,177	$	62,257	$	164,270
Purchases of rental equipment and refurbishments	$	34,249	$	7,234	$	677	$	431	$	—	$	42,591

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

	Nine Months Ended September 30, 2021
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	636,979	$	267,489	$	61,426	$	56,343			$	1,022,237
Delivery and installation	161,548		73,214		18,152		21,969				274,883
Sales revenue:
New units	27,814		5,355		2,746		1,908				37,823
Rental units	28,316		11,381		1,214		1,123				42,034
Total revenues	854,657		357,439		83,538		81,343				1,376,977
Costs:
Cost of leasing and services:
Leasing	172,108		37,300		13,339		12,628				235,375
Delivery and installation	147,514		51,811		10,638		18,317				228,280
Cost of sales:
New units	19,330		3,190		1,802		1,338				25,660
Rental units	14,611		6,667		1,163		429				22,870
Depreciation of rental equipment	144,102		17,635		3,290		10,026				175,053
Gross profit	$	356,992	$	240,836	$	53,306	$	38,605			$	689,739
Other selected data:
Adjusted EBITDA	$	307,741	$	154,971	$	36,647	$	29,870	$	—	$	529,229
Selling, general and administrative expense (a)	$	192,285	$	103,501	$	19,949	$	18,868	$	38,840	$	373,443
Purchases of rental equipment and refurbishments	$	120,288	$	24,165	$	22,645	$	11,093	$	—	$	178,191

(a) Includes both SG&A expense and Transaction costs from the consolidated statement of operations.

	Nine Months Ended September 30, 2020
(in thousands)	NA Modular		NA Storage		UK Storage		Tank and Pump		Unallocated Costs		Total
Revenues:
Leasing and services revenue:
Leasing	$	570,738	$	77,041	$	15,399	$	15,399			$	678,577
Delivery and installation	154,854		20,868		4,744		6,938				187,404
Sales revenue:
New units	33,400		3,783		1,011		542				38,736
Rental units	21,558		2,801		499		423				25,281
Total revenues	780,550		104,493		21,653		23,302				929,998
Costs:
Cost of leasing and services:
Leasing	147,072		9,260		3,382		2,630				162,344
Delivery and installation	131,853		13,120		3,240		5,529				153,742
Cost of sales:
New units	22,018		2,351		726		374				25,469
Rental units	13,965		1,930		466		85				16,446
Depreciation of rental equipment	137,409		4,448		1,168		3,254				146,279
Gross profit	$	328,233	$	73,384	$	12,671	$	11,430			$	425,718
Other selected data:
Adjusted EBITDA	$	287,345	$	46,465	$	8,306	$	8,507	$	—	$	350,623
Selling, general and administrative expense (a)	$	180,791	$	31,368	$	5,533	$	6,177	$	80,641	$	304,510
Purchases of rental equipment and refurbishments	$	113,931	$	7,234	$	677	$	431	$	—	$	122,273

(a) Includes both SG&A expense and Transaction costs from the condensed consolidated statement of operations.

Reconciliation of Company’s Income (Loss) from Operations to Adjusted EBITDA

The following tables present a reconciliation of the Company’s income (loss) from operations to Adjusted EBITDA for the three and nine months ended September 30, 2021 and 2020, respectively:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Net income (loss)	$	61,103	$	(6,051)	$	85,921	$	71,474
Income tax expense (benefit)	6,644		(66,675)		35,953		(66,170)
Loss on extinguishment of debt	—		42,401		5,999		42,401
Fair value loss (gain) on common stock warrant liabilities	—		22,303		26,597		(46,063)
Interest expense	29,201		33,034		88,377		89,810
Depreciation and amortization	75,276		71,704		233,813		169,103
Currency losses (gains), net	127		(371)		196		147
Restructuring costs, lease impairment expense and other related charges	2,457		4,798		14,286		8,542
Transaction costs	303		52,191		1,147		63,241
Integration costs	8,247		7,083		23,211		10,921
Stock compensation expense	6,259		2,944		14,480		6,958
Other	532		198		(751)		259
Adjusted EBITDA	$	190,149	$	163,559	$	529,229	$	350,623

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Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

The following table reconciles net income attributable to WillScot Mobile Mini common shareholders and the weighted average shares outstanding for the basic calculation to the weighted average shares outstanding for the diluted calculation:

	Three Months Ended				Nine Months Ended
	September 30				September 30
(in thousands)	2021		2020		2021		2020
Numerator:
Net income (loss) attributable to common shareholders - basic	$	61,103	$	(6,051)	$	85,921	$	70,261
Fair value gain on common stock warrant liabilities	—		—		—		(47,718)
Net income (loss) attributable to common shareholders - dilutive	$	61,103	$	(6,051)	$	85,921	$	22,543
Denominator:
Weighted average Common Shares outstanding - basic	225,998		226,650		227,558		149,283
Dilutive effect of shares outstanding
Warrants	3,722		—		4,112		2,122
RSAs	4		—		25		31
Time-based RSUs	476		—		573		314
Performance-based RSUs	618		—		751		272
Stock Options	1,050		—		1,066		411
Weighted average Common Shares outstanding - dilutive	231,868		226,650		234,085		152,433

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potential common shares were excluded from the computation of dilutive EPS because their effect would have been anti-dilutive:

	Three Months Ended		Nine Months Ended
	September 30		September 30
(in thousands)	2021	2020	2021	2020
Warrants	—	18,758	—	—
RSAs	—	57	—	—
Time-based RSUs	—	1,352	—	—
Performance-based RSUs	—	184	—	—
Stock Options	—	7,630	—	—

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Related Parties (Tables)

9 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Schedule of Related Party Transaction, Due From (To) Related Party

Related party balances included in the Company’s condensed consolidated balance sheets at September 30, 2021 and December 31, 2020, consisted of the following:

(in thousands)	Financial Statement Line Item	September 30, 2021		December 31, 2020
Receivables due from affiliates	Trade receivables, net of allowances for credit losses	$	433	$	30
Amounts due to affiliates	Accrued expenses	(392)		(461)
Total related party liabilities, net		$	41	$	(431)

Schedule of Related Party Transaction, Income (Expenses) from Related Party

Related party transactions included in the Company’s condensed consolidated statements of operations for the three and nine months ended September 30, 2021 and 2020, respectively, consisted of the following:

		Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	Financial Statement Line Item	2021		2020		2021		2020
Leasing revenue from related parties	Leasing revenue	$	541	$	504	$	706	$	1,330
Consulting expense to related party	Selling, general & administrative expense	(1,511)		(1,738)		(3,660)		(4,733)
Total related party expense, net		$	(970)	$	(1,234)	$	(2,954)	$	(3,403)

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Summary of Significant Accounting Policies (Details) - $ / shares	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2020
Business Acquisition [Line Items]
Common stock par value (in USD per share)	$ 0.0001	$ 0.0001	$ 0.0001
Class A Common Stock
Business Acquisition [Line Items]
Common stock par value (in USD per share)			$ 0.0001

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Acquisitions - Narrative (Details)			3 Months Ended		9 Months Ended
	Sep. 17, 2021 USD ($) storageUnit	Jul. 01, 2020 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares
Business Acquisition [Line Items]
Common stock par value (in USD per share) | $ / shares		$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001
Rental equipment, net			$ 2,968,895,000		$ 2,968,895,000		$ 2,931,646,000
Transaction costs			303,000	$ 52,191,000	1,147,000	$ 63,241,000
Integration costs			8,247,000	7,083,000	23,211,000	10,921,000
Mobile Mini, Inc.
Business Acquisition [Line Items]
Number of shares exchanged (in shares) | shares		2.405
Common stock issued (in shares) | shares		106,426,721
Value of shares converted from acquiree's shares (in USD per share) | $ / shares		$ 12.53
Revenue since acquisition date					522,300,000
Pre-tax income since acquisition date					94,300,000
Payments to acquire businesses		$ 30,000
Transaction costs			300,000	52,200,000	1,100,000	63,200,000
Integration costs			$ 8,200,000	$ 7,100,000	$ 23,200,000	$ 9,400,000
Equipe Container Services, Inc., Saf-T-Box, LP and American Mobile Leasing, LLC
Business Acquisition [Line Items]
Payments to acquire businesses	$ 56,300,000
Rental equipment, net	53,000,000
Land	$ 3,000,000
Equipe Container Services, Inc., Saf-T-Box, LP and American Mobile Leasing, LLC | Storage Unit
Business Acquisition [Line Items]
Number of units in real estate property acquired | storageUnit	11,000
Equipe Container Services, Inc., Saf-T-Box, LP and American Mobile Leasing, LLC | Modular Unit
Business Acquisition [Line Items]
Number of units in real estate property acquired | storageUnit	400
Mobile Mini, Inc.
Business Acquisition [Line Items]
Common stock par value (in USD per share) | $ / shares		$ 0.01

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Acquisitions - Schedule of Consideration Transferred and Purchase Price Allocation (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 01, 2020	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Mobile Mini Common Stock outstanding (in shares)		223,665,627	229,038,158
Mobile Mini, Inc.
Business Acquisition [Line Items]
Share conversion ratio (in shares)	2.405
Common stock issued (in shares)	106,426,721
Common Stock per share price as of July 1, 2020 (in USD per share)	$ 12.53
Cash paid for fractional shares	$ 30
Total purchase price	$ 1,352,836
Mobile Mini, Inc. | Mobile Mini, Inc.
Business Acquisition [Line Items]
Mobile Mini Common Stock outstanding (in shares)	44,252,275
Mobile Mini, Inc. | Common Stock
Business Acquisition [Line Items]
Common stock issued (in shares)	106,426,721
Common Stock per share price as of July 1, 2020 (in USD per share)	$ 12.53
Fair value of shares issued and converted	$ 1,333,527
Mobile Mini, Inc. | Stock Options
Business Acquisition [Line Items]
Fair value of shares issued and converted	$ 19,279

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Acquisitions - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill identified	$ 1,178,290	$ 1,171,219		$ 235,177
Mobile Mini, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 17,203
Trade receivables			87,492
Inventories			8,987
Prepaid expenses and other current assets			13,717
Rental equipment			1,032,672
Property, plant and equipment			160,729
Operating lease assets			92,054
Intangible assets			374,500
Goodwill identified			937,135
Other non-current assets			2,520
Total identifiable assets acquired			2,727,009
Accounts payable			(29,797)
Accrued expenses			(40,335)
Deferred revenue and customer deposits			(38,846)
Operating lease liabilities			(89,968)
Debt and finance lease liabilities			(897,244)
Deferred tax liabilities			(276,555)
Other long-term liabilities			(1,428)
Total liabilities assumed			(1,374,173)
Purchase Price			$ 1,352,836

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Acquisitions - Pro Forma Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 15, 2020
Business Acquisition [Line Items]
Revenues		$ 490,552	$ 417,315	$ 1,376,977	$ 929,998
Income (loss) before income tax		$ 67,747	(72,726)	$ 121,874	5,304
State and federal income taxes, percent		25.50%		25.50%
Elimination of reversal of valuation allowance due to reassessment			$ 54,100		56,800
2025 Secured Notes | Senior Notes
Business Acquisition [Line Items]
Interest rate	6.125%	6.125%		6.125%		6.125%
Revolving Credit Facility | 2020 ABL Facility | Line of Credit
Business Acquisition [Line Items]
Debt drawn	$ 1,470,000
Estimated interest rate	2.046%
Mobile Mini, Inc.
Business Acquisition [Line Items]
Revenues					284,240
Mobile Mini, Inc.
Business Acquisition [Line Items]
Pro forma revenues					1,214,238
Income (loss) before income tax					138,978
Pro forma income before income tax					43,179
Income tax expense					22,300
Pro forma net income					116,678
Intangible assets	$ 374,500
Mobile Mini, Inc. | Mobile Mini customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 209,000
Mobile Mini, Inc. | Elimination of Merger transaction costs
Business Acquisition [Line Items]
Income (loss) before income tax					80,040
Mobile Mini, Inc. | Impact of fair value mark-ups on rental fleet depreciation
Business Acquisition [Line Items]
Income (loss) before income tax					(2,334)
Mobile Mini, Inc. | Other depreciation expense and intangible asset amortization
Business Acquisition [Line Items]
Income (loss) before income tax					(11,397)
Mobile Mini, Inc. | Interest expense
Business Acquisition [Line Items]
Income (loss) before income tax					(6,113)
Mobile Mini, Inc. | Elimination of Mobile Mini interest expense
Business Acquisition [Line Items]
Income (loss) before income tax					15,921
Mobile Mini, Inc. | Elimination of loss on extinguishment of debt
Business Acquisition [Line Items]
Income (loss) before income tax				$ 19,682
Mobile Mini, Inc. | Mobile Mini, Inc.
Business Acquisition [Line Items]
Income (loss) before income tax					$ 37,875

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Revenue - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 490,552	$ 417,315	$ 1,376,977	$ 929,998
Modular space leasing revenue
Disaggregation of Revenue [Line Items]
Total revenues	188,507	163,635	539,835	427,409
Portable storage leasing revenue
Disaggregation of Revenue [Line Items]
Total revenues	66,184	52,941	179,645	64,506
Tank and pump leasing revenue
Disaggregation of Revenue [Line Items]
Total revenues	19,040	14,112	51,909	14,112
VAPS and third party leasing revenues
Disaggregation of Revenue [Line Items]
Total revenues	73,517	56,330	206,823	139,754
Other leasing-related revenue
Disaggregation of Revenue [Line Items]
Total revenues	16,148	13,064	44,025	32,796
Leasing revenue
Disaggregation of Revenue [Line Items]
Total revenues	363,396	300,082	1,022,237	678,577
Delivery and installation revenue
Disaggregation of Revenue [Line Items]
Total revenues	99,699	84,694	274,883	187,404
Total leasing and services revenue
Disaggregation of Revenue [Line Items]
Total revenues	463,095	384,776	1,297,120	865,981
New unit sales revenue
Disaggregation of Revenue [Line Items]
Total revenues	15,860	19,360	37,823	38,736
Rental unit sales revenue
Disaggregation of Revenue [Line Items]
Total revenues	11,597	13,179	42,034	25,281
VAPS service
Disaggregation of Revenue [Line Items]
Total revenues	7,200	5,600	21,200	13,900
US
Disaggregation of Revenue [Line Items]
Total revenues	427,251	368,285	1,197,800	841,227
Canada
Disaggregation of Revenue [Line Items]
Total revenues	31,536	24,098	84,663	57,083
Mexico
Disaggregation of Revenue [Line Items]
Total revenues	3,666	3,279	10,977	10,035
UK
Disaggregation of Revenue [Line Items]
Total revenues	$ 28,099	$ 21,653	$ 83,537	$ 21,653

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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Deferred revenue for removal services for lease transactions and advance billings for sale transactions	$ 78.8		$ 78.8		$ 74.1
Recognition of previously deferred revenue for removal services for lease transactions and advance billings for sale transactions			$ 20.9
Trade receivables, net of allowances for credit losses | Credit Concentration Risk | Top Five Customers
Disaggregation of Revenue [Line Items]
Concentration risk percentage			4.70%
Modular Leasing | Revenues | Revenue Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	73.00%	71.00%	73.00%	71.00%

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Revenue - Rollforward of Accounts and Notes Receivable, Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 36,785	$ 19,183	$ 29,258	$ 15,828
Net charges to bad debt expense and revenue	9,751	13,062	26,661	22,184
Write-offs	(4,543)	(6,822)	(14,415)	(12,395)
Foreign currency translation and other	(126)	(1,237)	363	(1,431)
Balance at end of period	$ 41,867	$ 24,186	$ 41,867	$ 24,186

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Leases - Lease Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating
2021 (remaining)	$ 16,246
2022	60,038
2023	49,165
2024	40,555
2025	33,371
Thereafter	76,957
Total lease payments	276,332
Less: interest	(42,745)
Present value of lease liabilities	233,587
Finance
2021 (remaining)	5,520
2022	20,012
2023	16,561
2024	13,639
2025	13,747
Thereafter	22,841
Total lease payments	92,320
Less: interest	(6,720)
Present value of lease liabilities	$ 85,600	$ 77,874

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Leases - Lease Cost (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Finance Lease Expense
Amortization of finance lease assets	$ 14,231	$ 4,360
Interest on obligations under finance leases	1,674	512
Total finance lease expense	15,905	4,872
Operating Lease Expense
Total operating lease expense	79,299	67,665
Cost of leasing and services
Operating Lease Expense
Fixed lease expense	3,019	4,444
Short-term lease expense	17,751	19,765
Variable lease expense	5,442	5,277
Selling, general and administrative
Operating Lease Expense
Fixed lease expense	44,732	29,682
Short-term lease expense	680	1,612
Variable lease expense	5,702	3,645
Lease impairment expense and other related charges
Operating Lease Expense
Fixed lease expense	1,571	2,103
Short-term lease expense	0	471
Variable lease expense	$ 402	$ 666

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Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Lease impairment expense and other related charges	$ 601	$ 944	$ 2,328	$ 3,999
Impairment charges and loss on lease exit			300
Closed location rent expense			$ 2,000	3,300
Loss on lease exit				$ 700

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Leases - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for the amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 48,403	$ 35,065
Operating cash outflows from finance leases	1,669	491
Financing cash outflows from finance leases	12,388	3,434
Right of use assets obtained in exchange for lease obligations	43,448	26,727
Assets obtained in exchange for finance leases	$ 19,947	$ 6,322

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Leases - Lease Terms and Discount Rates (Details)	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term - operating leases	6 years	6 years 4 months 24 days
Weighted-average discount rate - operating leases	5.30%	5.70%
Weighted-average remaining lease term - finance leases	4 years 6 months	4 years 7 months 6 days
Weighted-average discount rate - finance leases	2.90%	2.90%

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Inventories - Schedule of Mobile Mini Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 24,472	$ 19,560
Finished units	6,471	4,171
Inventories	$ 30,943	$ 23,731

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Rental Equipment, net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total rental equipment	$ 3,925,490	$ 3,725,714
Less: accumulated depreciation	(956,595)	(794,068)
Rental equipment, net	2,968,895	2,931,646
Modular space units
Property, Plant and Equipment [Line Items]
Total rental equipment	2,901,998	2,796,284
Portable storage units
Property, Plant and Equipment [Line Items]
Total rental equipment	716,033	653,707
Tank and pump products
Property, Plant and Equipment [Line Items]
Total rental equipment	149,123	132,071
Value added products
Property, Plant and Equipment [Line Items]
Total rental equipment	$ 158,336	$ 143,652

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Goodwill - Goodwill Activity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 1,171,219	$ 235,177
Acquisition of Mobile Mini		928,974
Changes to Mobile Mini purchase accounting	8,161
Effects of movements in foreign exchange rates	(1,090)	7,068
Goodwill, end of period	1,178,290	1,171,219
NA Modular
Goodwill [Roll Forward]
Goodwill, beginning of period	235,828	235,177
Acquisition of Mobile Mini		0
Changes to Mobile Mini purchase accounting	285,000
Effects of movements in foreign exchange rates	113	651
Goodwill, end of period	520,941	235,828
NA Storage
Goodwill [Roll Forward]
Goodwill, beginning of period	726,529	0
Acquisition of Mobile Mini		726,529
Changes to Mobile Mini purchase accounting	(233,666)
Effects of movements in foreign exchange rates	(311)	0
Goodwill, end of period	492,552	726,529
UK Storage
Goodwill [Roll Forward]
Goodwill, beginning of period	65,600	0
Acquisition of Mobile Mini		59,183
Changes to Mobile Mini purchase accounting	0
Effects of movements in foreign exchange rates	(910)	6,417
Goodwill, end of period	64,690	65,600
Tank and Pump
Goodwill [Roll Forward]
Goodwill, beginning of period	143,262	0
Acquisition of Mobile Mini		143,262
Changes to Mobile Mini purchase accounting	(43,173)
Effects of movements in foreign exchange rates	18	0
Goodwill, end of period	$ 100,107	$ 143,262

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Goodwill - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment loss	$ 0	$ 0

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Intangibles - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Intangible assets subject to amortization:
Accumulated amortization	$ (35,211)	$ (14,553)
Net book value	178,289
Intangible Assets, Net (Including Goodwill) [Abstract]
Gross carrying amount	502,500	510,500
Accumulated amortization	(35,211)	(14,553)
Net book value	467,289	495,947
Trade name - Mobile Mini
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	164,000	164,000
Trade name - WillScot
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	$ 125,000	$ 125,000
Trade name - ModSpace
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life (in years)	0 years	8 months 12 days
Intangible assets subject to amortization:
Gross carrying amount	$ 3,000	$ 3,000
Accumulated amortization	(3,000)	(2,375)
Net book value	0	625
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated amortization	$ (3,000)	$ (2,375)
Mobile Mini customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life (in years)	6 years 9 months 18 days	8 years
Intangible assets subject to amortization:
Gross carrying amount	$ 209,000	$ 217,000
Accumulated amortization	(31,898)	(12,053)
Net book value	177,102	204,947
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated amortization	$ (31,898)	$ (12,053)
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life (in years)	4 years 9 months 18 days	5 years 6 months
Intangible assets subject to amortization:
Gross carrying amount	$ 1,500	$ 1,500
Accumulated amortization	(313)	(125)
Net book value	1,187	1,375
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated amortization	$ (313)	$ (125)

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Intangibles - Narrative (Details) - Mobile Mini, Inc. - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jul. 01, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 6.8	$ 5.4	$ 20.6	$ 5.9
Customer relationships and technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, finite-lived					$ 210.5
Trade name - Mobile Mini
Finite-Lived Intangible Assets [Line Items]
Intangible assets, indefinite-lived					$ 164.0

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Intangibles - Future Amortization (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2021 (remaining)	$ 6,604
2022	26,416
2023	26,416
2024	26,416
2025	26,416
Thereafter	66,021
Net book value	$ 178,289

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Debt - Carrying Value of Debt Outstanding (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Aug. 25, 2020	Jul. 01, 2020	Jun. 15, 2020
Debt Instrument [Line Items]
Finance Leases	$ 85,600,000	$ 77,874,000
Total debt	2,616,952,000	2,470,330,000
Less: current portion of long-term debt	18,652,000	16,521,000
Total long-term debt	$ 2,598,300,000	2,453,809,000
Senior Notes | 2025 Secured Notes
Debt Instrument [Line Items]
Interest rate	6.125%			6.125%	6.125%
Long-term debt	$ 517,581,000	637,068,000
Unamortized debt issuance costs	$ 8,900,000	12,900,000
Senior Notes | 2028 Secured Notes
Debt Instrument [Line Items]
Interest rate	4.625%		4.625%
Long-term debt	$ 492,253,000	491,555,000
Unamortized debt issuance costs	7,700,000	8,400,000
Line of Credit | ABL Facility - Multicurrency Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	1,521,518,000	1,263,833,000
Outstanding principal	0	0
Unamortized debt issuance costs	$ 6,600,000	$ 7,900,000

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Debt - Narrative (Details) - USD ($)						3 Months Ended				9 Months Ended
	Jun. 16, 2021	Mar. 26, 2021	Aug. 25, 2020	Aug. 11, 2020	Jul. 01, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2020	Jun. 15, 2020	May 14, 2019	Nov. 29, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt						$ 0			$ 42,401,000	$ 5,999,000	$ 42,401,000
Finance Leases						85,600,000				85,600,000		$ 77,874,000
Senior Notes | 2022 Secured Notes
Debt Instrument [Line Items]
Debt, face amount													$ 270,000,000
Interest rate													7.875%
Senior Notes | 2023 Senior Secured Notes
Debt Instrument [Line Items]
Repayments of debt			$ 441,000,000	$ 49,000,000
Debt, face amount															$ 490,000,000
Interest rate															6.875%
Percentage of principal amount redeemed				10.00%
Senior Notes | 2025 Secured Notes
Debt Instrument [Line Items]
Repayments of debt		$ 65,000,000
Write-off of unamortized deferred financing fees							$ 1,000,000	$ 1,300,000
Unamortized debt issuance costs						$ 8,900,000				$ 8,900,000		12,900,000
Debt, face amount														$ 650,000,000
Interest rate					6.125%	6.125%				6.125%				6.125%
Percentage of principal amount redeemed	10.00%	10.00%
Loss on extinguishment of debt							2,800,000	3,200,000
Early redemption premium							$ 1,800,000	$ 1,900,000
Extinguishment of debt, amount	$ 58,500,000
Senior Notes | 2028 Secured Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs						$ 7,700,000				$ 7,700,000		8,400,000
Debt, face amount			$ 500,000,000
Interest rate			4.625%			4.625%				4.625%
Revolving Credit Facility | Line of Credit | 2017 ABL Facility - US Facility
Debt Instrument [Line Items]
Maximum aggregate availability																$ 1,300,000,000
Revolving Credit Facility | Line of Credit | 2017 ABL Facility - Canadian ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability																140,000,000
Revolving Credit Facility | Line of Credit | 2017 ABL Facility
Debt Instrument [Line Items]
Accordion feature																$ 375,000,000
Repayments of debt					$ 1,500,000,000
Write-off of unamortized deferred financing fees									$ 4,400,000
Revolving Credit Facility | Line of Credit | 2020 ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability					$ 2,400,000,000	$ 2,400,000,000				$ 2,400,000,000
Fee on unused borrowings					0.225%
Weighted average interest rate for borrowings						1.97%				1.97%
Available borrowing capacity						$ 831,600,000				$ 831,600,000
Letters of credit amount outstanding						12,900,000				12,900,000
Outstanding principal						1,600,000,000				1,600,000,000
Unamortized debt issuance costs						$ 34,000,000				$ 34,000,000
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | Interest rate swap
Debt Instrument [Line Items]
Weighted average interest rate for borrowings after interest rate derivatives						2.73%				2.73%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | LIBOR | United States of America, Dollars
Debt Instrument [Line Items]
Basis spread on variable rate					1.875%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | LIBOR | Euro Member Countries, Euro
Debt Instrument [Line Items]
Basis spread on variable rate					1.875%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | LIBOR | United Kingdom, Pounds
Debt Instrument [Line Items]
Basis spread on variable rate					1.875%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | Base Rate | United States of America, Dollars
Debt Instrument [Line Items]
Basis spread on variable rate					0.875%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | BA Rate | Canada, Dollars
Debt Instrument [Line Items]
Basis spread on variable rate					1.875%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility | Prime Rate | Canada, Dollars
Debt Instrument [Line Items]
Basis spread on variable rate					0.875%
Revolving Credit Facility | Line of Credit | 2020 ABL Facility - US Facility
Debt Instrument [Line Items]
Maximum aggregate availability					$ 2,000,000,000
Available borrowing capacity						$ 431,600,000				$ 431,600,000
Revolving Credit Facility | Line of Credit | 2020 ABL Facility - Multicurrency Facility
Debt Instrument [Line Items]
Maximum aggregate availability					$ 400,000,000
Available borrowing capacity						400,000,000				400,000,000
Outstanding principal						0				0		0
Unamortized debt issuance costs						6,600,000				$ 6,600,000		$ 7,900,000
Letter of Credit | Line of Credit | 2017 ABL Facility
Debt Instrument [Line Items]
Fee on unused borrowings										2.00%
Letter of Credit | Line of Credit | 2020 ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability						207,100,000				$ 207,100,000
Swingline Loans | Line of Credit | 2020 ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability						$ 170,000,000				$ 170,000,000

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Equity - Narrative (Details) - USD ($)			3 Months Ended			9 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 31, 2021	Apr. 29, 2021	Dec. 31, 2020	Aug. 07, 2020
Subsidiary, Sale of Stock [Line Items]
Shares issued for each share converted (in shares)		1.3261
Common stock par value (in USD per share)	$ 0.0001		$ 0.0001			$ 0.0001				$ 0.0001
Shares issued for conversion (in shares)		10,641,182
Shares issued for conversion					$ 0
Issuance of Common Stock from the exercise of options and warrants (in shares)						5,273,466
Authorized share repurchase program									$ 500,000,000		$ 250,000,000
Shares repurchased (in shares)						11,656,552
Shares repurchased						$ 322,600,000
Remaining authorized share repurchase program			$ 142,200,000			142,200,000
Net gain (loss) on derivatives, net of income tax expense (benefit)			$ 676,000	$ (1,183,000)		1,999,000	$ (1,183,000)
Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Authorized share repurchase program								$ 1,000,000,000
Interest rate swap | Interest expense, net
Subsidiary, Sale of Stock [Line Items]
Loss reclassified from AOCI into income (effective portion)						$ (8,967,000)	$ (7,147,000)
Mobile Mini, Inc.
Subsidiary, Sale of Stock [Line Items]
Shares issued for merger (in shares)	106,426,722
Non-Controlling Interest
Subsidiary, Sale of Stock [Line Items]
Shares issued for conversion		$ (63,900,000)			(63,918,000)
Additional Paid-in-Capital
Subsidiary, Sale of Stock [Line Items]
Shares issued for conversion		66,900,000			66,890,000
Accumulated Other Comprehensive Income (Loss)
Subsidiary, Sale of Stock [Line Items]
Shares issued for conversion		$ (3,000,000)			$ (2,972,000)
Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock par value (in USD per share)		$ 0.0001			$ 0.0001

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Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				$ 670,668	$ 647,024	$ 555,199
Other comprehensive income (loss) before reclassifications	$ (11,992)	$ 2,245	$ 4,274	15,566	6,340	(31,474)
Reclassifications from AOCI to income	3,036	2,994	2,937	2,958	2,617	1,572
Less other comprehensive loss (income) attributable to non-controlling interest					(818)	2,703
Impact of elimination of non-controlling interest on accumulated other comprehensive income					(2,972)
Ending Balance				2,037,780	670,668	647,024
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(16,567)	(19,660)	(24,694)	(66,260)	(72,213)	(52,982)
Other comprehensive income (loss) before reclassifications	(11,162)	3,093	5,034	14,619	7,982	(21,144)
Reclassifications from AOCI to income	0	0	0	0	0	0
Less other comprehensive loss (income) attributable to non-controlling interest					(730)	1,913
Impact of elimination of non-controlling interest on accumulated other comprehensive income					(1,299)
Ending Balance	(27,729)	(16,567)	(19,660)	(51,641)	(66,260)	(72,213)
Unrealized losses on hedging activities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,190)	(10,336)	(12,513)	(18,547)	(17,761)	(9,793)
Other comprehensive income (loss) before reclassifications	(830)	(848)	(760)	947	(1,642)	(10,330)
Reclassifications from AOCI to income	3,036	2,994	2,937	2,958	2,617	1,572
Less other comprehensive loss (income) attributable to non-controlling interest					(88)	790
Impact of elimination of non-controlling interest on accumulated other comprehensive income					(1,673)
Ending Balance	(5,984)	(8,190)	(10,336)	(14,642)	(18,547)	(17,761)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(24,757)	(29,996)	(37,207)	(84,807)	(89,974)	(62,775)
Ending Balance	$ (33,713)	$ (24,757)	$ (29,996)	$ (66,283)	$ (84,807)	$ (89,974)

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Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 24, 2020	Feb. 24, 2020	Jan. 24, 2020	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2018
2015 Public Warrants
Class of Warrant or Right [Line Items]
Number of shares which can be exchanged per warrant (in shares)					0.5
Warrant half exercise price (in USD per share)					$ 5.75
Warrants exercise price (in USD per share)					$ 11.50
Warrants exercised (in shares)	38,509	5,836,048	796,610
Proceeds from warrant exercises			$ 4.6
Receipts from issuance of Common Stock from the exercise of options (in shares)		1,097,162	398,305
Warrant redemption price (in USD per share)	$ 0.01	$ 0.01
Warrants outstanding (in shares)					0
2015 Private warrants
Class of Warrant or Right [Line Items]
Number of shares which can be exchanged per warrant (in shares)					0.5
Warrant half exercise price (in USD per share)				$ 5.75
Warrants exercise price (in USD per share)				$ 11.50
Warrants exercised (in shares)				9,655,000
Receipts from issuance of Common Stock from the exercise of options (in shares)				2,939,898
Warrants outstanding (in shares)				0
Warrants repurchased and canceled (in shares)				3,055,000
Warrants repurchased and canceled				$ 25.5
2018 Warrants
Class of Warrant or Right [Line Items]
Number of shares which can be exchanged per warrant (in shares)					1
Warrants exercise price (in USD per share)					$ 15.50
Warrants exercised (in shares)					2,981,195
Receipts from issuance of Common Stock from the exercise of options (in shares)					1,372,548
Warrants outstanding (in shares)					6,525,736
Warrants repurchased and canceled (in shares)					223,310
Warrants repurchased and canceled					$ 2.3
2018 Warrants | Modular Space Holdings Inc. | Warrants
Class of Warrant or Right [Line Items]
Warrants issued from acquisition (in shares)						10,000,000

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Warrant - Schedule of Fair Value of Outstanding Warrants Recorded as Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Class of Warrant or Right [Line Items]
Common stock warrant liabilities	$ 0	$ 77,404
2015 Private warrants
Class of Warrant or Right [Line Items]
Common stock warrant liabilities		$ 77,404

XML

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 6,644	$ (66,675)	$ 35,953	$ (66,170)
Effective tax rate	9.80%	91.70%	29.50%	(1247.50%)
Reserves for uncertain tax positions	$ 12,800

XML

Fair Value Measures (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 2,531,352	$ 2,392,456
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	0	0
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	2,633,309	2,518,308
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	0	0
ABL Facilities | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	34,000	40,800
ABL Facilities | Carrying Amount | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	1,521,518	1,263,833
ABL Facilities | Fair Value | Level 1 | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
ABL Facilities | Fair Value | Level 2 | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	1,555,500	1,304,612
ABL Facilities | Fair Value | Level 3 | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2025 Secured Notes | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	8,900	12,900
2025 Secured Notes | Carrying Amount | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	517,581	637,068
2025 Secured Notes | Fair Value | Level 1 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2025 Secured Notes | Fair Value | Level 2 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	556,374	694,876
2025 Secured Notes | Fair Value | Level 3 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2028 Secured Notes | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	7,700	8,400
2028 Secured Notes | Carrying Amount | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	492,253	491,555
2028 Secured Notes | Fair Value | Level 1 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2028 Secured Notes | Fair Value | Level 2 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	521,435	518,820
2028 Secured Notes | Fair Value | Level 3 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 0	$ 0

XML

Fair Value Measures - Warrant Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities	$ 0	$ 77,404
2015 Private warrants
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities		77,404
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities	0	77,404
Carrying Amount | 2015 Private warrants
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities		77,404
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities	0	0
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities	0	0
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities	$ 0	77,404
Fair Value | 2015 Private warrants | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities		0
Fair Value | 2015 Private warrants | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities		0
Fair Value | 2015 Private warrants | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrant liabilities		$ 77,404

XML

Fair Value Measures - Quantitative Information Regarding Level 3 Fair Value Measurments (Details) - 2015 Private warrants	Dec. 31, 2020
Stock Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	23.17
Strike Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	11.50
Expected Life
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	1.91
Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	0.412
Risk Free rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	0.0013
Dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	0
Fair value of warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant valuation input	12.17

XML

Fair Value Measures - Changes in Level 3 Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
2015 Private warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 34,421	$ 77,404	$ 72,705
Exercise or conversion		(78,495)	0
Measurement adjustment	22,303	25,486	(15,981)
Repurchases		(24,395)
Reclassification to equity at June 30, 2020			0
Ending balance	56,724	$ 0	56,724
2018 Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			58,369
Exercise or conversion			(416)
Measurement adjustment			(31,737)
Reclassification to equity at June 30, 2020			(26,216)
Ending balance	$ 0		$ 0

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Restructuring - Summary of Activities in the Restructuring Accruals (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance	$ 4,380	$ 525	$ 1,750	$ 447
Charges	1,856	3,854	11,958	4,543
Cash payments	(3,845)	(2,432)	(5,548)	(3,027)
Foreign currency translation	0	2	0	3
Non-cash movements	(1,442)	133	(7,211)	116
Ending balance	$ 949	$ 2,082	$ 949	$ 2,082

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Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,856	$ 3,854	$ 11,958	$ 4,543
Operating Segments | NA Modular
Restructuring Cost and Reserve [Line Items]
Restructuring costs	100	300	1,600	900
Operating Segments | NA Storage
Restructuring Cost and Reserve [Line Items]
Restructuring costs	400	3,300	3,200	3,300
Unallocated Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,400	$ 300	$ 7,200	$ 300

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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 6,259	$ 2,944	$ 14,480	$ 6,958
Unrecognized compensation expense for options	300		300
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	300	300	600	$ 700
Unrecognized compensation expense for awards	700		$ 700
Unrecognized compensation expense, period for recognition			8 months 12 days
Granted (in shares)			44,708	65,959
Vested (in shares)			57,448	61,266
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	3,200	1,600	$ 7,500	$ 3,900
Unrecognized compensation expense for awards	13,500		$ 13,500
Unrecognized compensation expense, period for recognition			2 years 3 months 18 days
Modification of awards	1,100		$ 5,900
Granted (in shares)			415,737	632,864
Vested (in shares)			467,055	323,678
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	2,700	800	$ 5,800	$ 1,700
Unrecognized compensation expense for awards	30,300		$ 30,300
Unrecognized compensation expense, period for recognition			2 years 8 months 12 days
Modification of awards	$ 300		$ 1,300
Granted (in shares)			977,645	325,256
Performance-Based Restricted Stock Units | Awards Granted 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR payout percentage, minimum	0.00%		0.00%
TSR payout percentage, maximum	200.00%		200.00%
TSR payout percentage, target	100.00%		100.00%
TSR, target	50.00%		50.00%
TSR, minimum	25.00%		25.00%
TSR, maximum	85.00%		85.00%
Granted (in shares)			555,790
Share price (in USD per share)	$ 47.50		$ 47.50
Performance-Based Restricted Stock Units | Awards Granted 2021 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			4 years 6 months
Performance-Based Restricted Stock Units | Awards Granted 2021 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			4 years 9 months 18 days
Performance-Based Restricted Stock Units | Awards Granted in 2020 and Prior
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR payout percentage, minimum	0.00%		0.00%
TSR payout percentage, maximum	150.00%		150.00%
TSR payout percentage, target	100.00%		100.00%
TSR, target	50.00%		50.00%
TSR, minimum	25.00%		25.00%
TSR, maximum	75.00%		75.00%
Unrestricted Stock | Awards Granted 2021 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)			0
Share price (in USD per share)	$ 42.50		$ 42.50
Unrestricted Stock | Awards Granted 2021 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)			1,333,334
Share price (in USD per share)	$ 60.00		$ 60.00
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 200	$ 200	$ 600	$ 600
Unrecognized compensation expense, period for recognition			6 months
2020 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which may be granted under plan (in shares)	6,488,988		6,488,988

XML

Stock-Based Compensation - Restricted Stock Award Activity (Details) - Restricted Stock Awards - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Number of Shares
Beginning balance (in shares)	57,448	52,755
Granted (in shares)	44,708	65,959
Forfeited (in shares)	(8,532)	0
Vested (in shares)	(57,448)	(61,266)
Ending balance (in shares)	36,176	57,448
Weighted-Average Grant Date Fair Value
Beginning balance (in USD per share)	$ 11.75	$ 14.69
Granted (in USD per share)	29.30	11.75
Forfeited (in USD per share)	29.30	0
Vested (in USD per share)	11.75	14.28
Ending balance (in USD per share)	$ 29.30	$ 11.75

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Stock-Based Compensation - Time-Based RSUs (Details) - Time-Based Restricted Stock Units - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Number of Shares
Beginning balance (in shares)	1,125,766	1,065,305
Granted (in shares)	415,737	632,864
Forfeited (in shares)	(65,153)	(22,728)
Vested (in shares)	(467,055)	(323,678)
Ending balance (in shares)	1,009,295	1,351,763
Weighted-Average Grant Date Fair Value
Beginning balance (in USD per share)	$ 13.44	$ 12.78
Granted (in USD per share)	27.25	14.37
Forfeited (in USD per share)	16.74	13.45
Vested (in USD per share)	14.14	12.93
Ending balance (in USD per share)	$ 18.59	$ 13.48

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Stock-Based Compensation - Performance Based PSUs (Details) - Performance-Based Restricted Stock Units - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Number of Shares
Beginning balance (in shares)	593,388	288,281
Granted (in shares)	977,645	325,256
Forfeited (in shares)	(20,077)	(12,700)
Ending balance (in shares)	1,550,956	600,837
Weighted-Average Grant Date Fair Value
Beginning balance (in USD per share)	$ 14.88	$ 13.22
Granted (in USD per share)	33.21	16.35
Forfeited (in USD per share)	25.87	14.70
Ending balance (in USD per share)	$ 26.29	$ 14.88

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Stock-Based Compensation - Stock Option Activity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
WillScot Options
Options
Beginning balance (in shares)	534,188	534,188
Forfeited (in shares)	0
Converted at Merger (in shares)		0
Exercised (in shares)	0	0
Ending balance (in shares)	534,188	534,188
Weighted-Average Exercise Price per Share
Beginning balance (in USD per share)	$ 13.60	$ 13.60
Forfeited (in USD per share)	0
Converted at Merger (in USD per share)		0
Exercised (in USD per share)	0	0
Ending balance (in USD per share)	$ 13.60	$ 13.60
Vested and exercisable stock options (in shares)	400,641	267,094
Vested and exercisable stock options, weighted-average exercise price per share (in USD per share)	$ 13.60	$ 13.60
Converted Mobile Mini Options
Options
Beginning balance (in shares)	2,031,455	0
Forfeited (in shares)	(6,240)
Converted at Merger (in shares)		7,361,516
Exercised (in shares)	(484,986)	(259,708)
Ending balance (in shares)	1,540,229	7,101,808
Weighted-Average Exercise Price per Share
Beginning balance (in USD per share)	$ 14.78	$ 0
Forfeited (in USD per share)	12.19
Converted at Merger (in USD per share)		13.52
Exercised (in USD per share)	15.26	11.99
Ending balance (in USD per share)	$ 14.65	$ 13.58
Vested and exercisable stock options (in shares)	1,540,229	7,101,808
Vested and exercisable stock options, weighted-average exercise price per share (in USD per share)	$ 14.65	$ 13.58

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Derivatives - Narrative (Details) - Interest rate swap - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Nov. 06, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Notational amount			$ 400,000,000
Fixed rate			3.06%
Receive rate	0.08%	0.15%

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Derivatives - Location and Fair Value of Derivative Instruments Designated as Hedges in the Consolidated Balance Sheet (Details) - Interest rate swap - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Accrued expenses	$ 8,380	$ 11,619
Other non-current liabilities	$ 0	$ 5,308

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Derivative - Impact of Interest Rate Swap (Details) - Interest rate swap - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI	$ 8,528	$ (5,061)
Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from AOCI into income (effective portion)	$ (8,967)	$ (7,147)

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Segment Reporting - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Stock compensation expense	$ 6,259	$ 2,944	$ 14,480	$ 6,958
Transition, Separation And Release Agreement
Segment Reporting Information [Line Items]
Stock compensation expense	$ 1,400		$ 7,200

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Segment Reporting - Segment Reporting and Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Leasing	$ 363,396	$ 300,082	$ 1,022,237	$ 678,577
Total revenues	490,552	417,315	1,376,977	929,998
Costs:
Leasing	82,448	64,788	235,375	162,344
Depreciation of rental equipment	56,462	54,837	175,053	146,279
Gross profit	253,549	209,564	689,739	425,718
Other selected data:
Adjusted EBITDA	190,149	163,559	529,229	350,623
Selling, general and administrative expense	133,727	164,270	373,443	304,510
Purchases of rental equipment and refurbishments	60,374	42,591	178,191	122,273
Delivery and installation
Revenues:
Revenues	99,699	84,694	274,883	187,404
Costs:
Cost of sales	80,991	66,354	228,280	153,742
New units
Revenues:
Revenues	15,860	19,360	37,823	38,736
Total revenues	15,860	19,360	37,823	38,736
Costs:
Cost of sales	11,499	12,935	25,660	25,469
Rental units
Revenues:
Revenues	11,597	13,179	42,034	25,281
Total revenues	11,597	13,179	42,034	25,281
Costs:
Cost of sales	5,603	8,837	22,870	16,446
Unallocated Costs
Other selected data:
Adjusted EBITDA	0	0	0	0
Selling, general and administrative expense	14,823	62,257	38,840	80,641
Purchases of rental equipment and refurbishments	0	0	0	0
NA Modular | Operating Segments
Revenues:
Leasing	219,736	192,243	636,979	570,738
Total revenues	299,051	267,867	854,657	780,550
Costs:
Leasing	59,260	49,516	172,108	147,072
Depreciation of rental equipment	46,566	45,967	144,102	137,409
Gross profit	127,854	112,079	356,992	328,233
Other selected data:
Adjusted EBITDA	106,825	100,281	307,741	287,345
Selling, general and administrative expense	66,529	58,935	192,285	180,791
Purchases of rental equipment and refurbishments	31,789	34,249	120,288	113,931
NA Modular | Operating Segments | Delivery and installation
Revenues:
Revenues	58,017	52,144	161,548	154,854
Costs:
Cost of sales	51,655	44,465	147,514	131,853
NA Modular | Operating Segments | New units
Revenues:
Revenues	13,483	14,024	27,814	33,400
Costs:
Cost of sales	10,080	9,484	19,330	22,018
NA Modular | Operating Segments | Rental units
Revenues:
Revenues	7,815	9,456	28,316	21,558
Costs:
Cost of sales	3,636	6,356	14,611	13,965
NA Storage | Operating Segments
Revenues:
Leasing	101,172	77,041	267,489	77,041
Total revenues	133,897	104,493	357,439	104,493
Costs:
Leasing	14,393	9,260	37,300	9,260
Depreciation of rental equipment	5,366	4,448	17,635	4,448
Gross profit	92,496	73,384	240,836	73,384
Other selected data:
Adjusted EBITDA	59,123	46,465	154,971	46,465
Selling, general and administrative expense	38,740	31,368	103,501	31,368
Purchases of rental equipment and refurbishments	11,920	7,234	24,165	7,234
NA Storage | Operating Segments | Delivery and installation
Revenues:
Revenues	28,330	20,868	73,214	20,868
Costs:
Cost of sales	19,328	13,120	51,811	13,120
NA Storage | Operating Segments | New units
Revenues:
Revenues	1,307	3,783	5,355	3,783
Costs:
Cost of sales	727	2,351	3,190	2,351
NA Storage | Operating Segments | Rental units
Revenues:
Revenues	3,088	2,801	11,381	2,801
Costs:
Cost of sales	1,587	1,930	6,667	1,930
UK Storage | Operating Segments
Revenues:
Leasing	21,691	15,399	61,426	15,399
Total revenues	28,099	21,653	83,538	21,653
Costs:
Leasing	4,314	3,382	13,339	3,382
Depreciation of rental equipment	1,058	1,168	3,290	1,168
Gross profit	18,876	12,671	53,306	12,671
Other selected data:
Adjusted EBITDA	13,255	8,306	36,647	8,306
Selling, general and administrative expense	6,680	5,533	19,949	5,533
Purchases of rental equipment and refurbishments	11,649	677	22,645	677
UK Storage | Operating Segments | Delivery and installation
Revenues:
Revenues	5,563	4,744	18,152	4,744
Costs:
Cost of sales	3,238	3,240	10,638	3,240
UK Storage | Operating Segments | New units
Revenues:
Revenues	580	1,011	2,746	1,011
Costs:
Cost of sales	368	726	1,802	726
UK Storage | Operating Segments | Rental units
Revenues:
Revenues	265	499	1,214	499
Costs:
Cost of sales	245	466	1,163	466
Tank and Pump | Operating Segments
Revenues:
Leasing	20,797	15,399	56,343	15,399
Total revenues	29,505	23,302	81,343	23,302
Costs:
Leasing	4,481	2,630	12,628	2,630
Depreciation of rental equipment	3,472	3,254	10,026	3,254
Gross profit	14,323	11,430	38,605	11,430
Other selected data:
Adjusted EBITDA	10,946	8,507	29,870	8,507
Selling, general and administrative expense	6,955	6,177	18,868	6,177
Purchases of rental equipment and refurbishments	5,016	431	11,093	431
Tank and Pump | Operating Segments | Delivery and installation
Revenues:
Revenues	7,789	6,938	21,969	6,938
Costs:
Cost of sales	6,770	5,529	18,317	5,529
Tank and Pump | Operating Segments | New units
Revenues:
Revenues	490	542	1,908	542
Costs:
Cost of sales	324	374	1,338	374
Tank and Pump | Operating Segments | Rental units
Revenues:
Revenues	429	423	1,123	423
Costs:
Cost of sales	$ 135	$ 85	$ 429	$ 85

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Segment Reporting - Reconciliation of Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting [Abstract]
Net income (loss)	$ 61,103	$ (6,051)	$ (14,130)	$ 91,655	$ 85,921	$ 71,474
Income tax expense (benefit)	6,644	(66,675)			35,953	(66,170)
Loss on extinguishment of debt	0	42,401			5,999	42,401
Fair value loss (gain) on common stock warrant liabilities	0	22,303			26,597	(46,063)
Interest expense	29,201	33,034			88,377	89,810
Depreciation and amortization	75,276	71,704			233,813	169,103
Currency losses (gains), net	127	(371)			196	147
Restructuring costs, lease impairment expense and other related charges	2,457	4,798			14,286	8,542
Transaction costs	303	52,191			1,147	63,241
Integration costs	8,247	7,083			23,211	10,921
Stock compensation expense	6,259	2,944			14,480	6,958
Other	532	198			(751)	259
Adjusted EBITDA	$ 190,149	$ 163,559			$ 529,229	$ 350,623

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Earnings (Loss) Per Share - Narrative (Details)	Jun. 30, 2020 shares
Earnings Per Share [Abstract]
Shares issued for conversion (in shares)	10,641,182

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Earnings (Loss) Per Share - Reconciliation of Weighted Average Shares Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (loss) attributable to common shareholders - basic	$ 61,103	$ (6,051)	$ 85,921	$ 70,261
Fair value gain on common stock warrant liabilities	0	0	0	(47,718)
Net income (loss) attributable to common shareholders - dilutive	$ 61,103	$ (6,051)	$ 85,921	$ 22,543
Denominator:
Weighted average Common Shares outstanding - basic (in shares)	225,998,202	226,649,993	227,557,664	149,283,083
Warrants (in shares)	3,722,000	0	4,112,000	2,122,000
Weighted average Common Shares outstanding - dilutive (in shares)	231,868,397	226,649,993	234,084,800	152,432,945
RSAs
Denominator:
Awards (in shares)	4,000	0	25,000	31,000
Time-based RSUs
Denominator:
Awards (in shares)	476,000	0	573,000	314,000
Performance-based RSUs
Denominator:
Awards (in shares)	618,000	0	751,000	272,000
Stock Options
Denominator:
Awards (in shares)	1,050,000	0	1,066,000	411,000

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Earnings (Loss) Per Share - Schedule of Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share because their effect would have been anti-dilutive (in shares)	0	18,758	0	0
RSAs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share because their effect would have been anti-dilutive (in shares)	0	57	0	0
Time-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share because their effect would have been anti-dilutive (in shares)	0	1,352	0	0
Performance-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share because their effect would have been anti-dilutive (in shares)	0	184	0	0
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share because their effect would have been anti-dilutive (in shares)	0	7,630	0	0

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Related Parties - Related Party Balances Included in Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Total related party liabilities, net	$ 41	$ (431)
Trade receivables, net of allowances for credit losses
Related Party Transaction [Line Items]
Receivables due from affiliates	433	30
Accrued expenses
Related Party Transaction [Line Items]
Amounts due to affiliates	$ (392)	$ (461)

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Related Parties - Related Party Transactions in Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transactions [Abstract]
Leasing revenue from related parties	$ 541	$ 504	$ 706	$ 1,330
Consulting expense to related party	(1,511)	(1,738)	(3,660)	(4,733)
Total related party expense, net	$ (970)	$ (1,234)	$ (2,954)	$ (3,403)

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Related Parties - Narrative (Details) - USD ($)						3 Months Ended	9 Months Ended
	Sep. 09, 2021	Jun. 29, 2021	Jun. 25, 2021	Mar. 01, 2021	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 22, 2018
Related Party Transaction [Line Items]
Shares issued for conversion (in shares)					10,641,182
Shares repurchased (in shares)							11,656,552
Affiliates
Related Party Transaction [Line Items]
Purchases from affiliates						$ 1,000,000	$ 2,500,000	$ 2,600,000
Sapphire Holdings Sale of Stock
Related Party Transaction [Line Items]
Shares repurchased (in shares)	2,379,839	3,900,000		2,750,000
Underwritten Secondary Offering
Related Party Transaction [Line Items]
Number of shares sold (in shares)	21,410,019
Sapphire Holding S.a. r.l. | Underwritten Secondary Offering
Related Party Transaction [Line Items]
Issuance of stock (in shares)			16,100,000
Margin Loan | Sapphire Holding S.a. r.l.
Related Party Transaction [Line Items]
Debt, face amount									$ 125,000,000