CyrusOne (CONE) 10-K 17 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 11, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-35789
Entity Registrant Name	CyrusOne Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	46-0691837
Entity Address, Address Line One	2850 N. Harwood Street
Entity Address, Address Line Two	Suite 2200
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75201
City Area Code	972
Local Phone Number	350-0060
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 8.9
Entity Common Stock, Shares Outstanding		129,563,290
Entity Central Index Key	0001553023
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	CONE
Security Exchange Name	NASDAQ
1.450% Senior Notes due 2027
Document Information [Line Items]
Title of 12(b) Security	1.450% Senior Notes due 2027
Trading Symbol	CONE27
Security Exchange Name	NASDAQ

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Name	Deloitte & Touche LLP
Auditor Location	Dallas, Texas
Auditor Firm ID	34

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investment in real estate:
Land	$ 210.5	$ 208.8
Buildings and improvements	2,344	2,035.2
Equipment	4,140.3	3,538.9
Gross operating real estate	6,694.8	5,782.9
Less accumulated depreciation	(2,184.1)	(1,767.9)
Net operating real estate	4,510.7	4,015
Construction in progress, including land under development	765.9	982.2
Land held for future development	301.3	268.3
Total investment in real estate, net	5,577.9	5,265.5
Cash and cash equivalents	346.3	271.4
Rent and other receivables (net of allowance for doubtful accounts of $1.4 and $3.5 as of December 31, 2021 and 2020, respectively)	420.4	334.2
Restricted cash	1.3	1.5
Operating lease right-of-use assets, net	143.7	211.4
Equity investments	30.3	67.1
Goodwill	455.1	455.1
Intangible assets (net of accumulated amortization of $280.1 and $249.3 as of December 31, 2021 and 2020, respectively)	124.8	157.8
Other assets	352.2	133.4
Total assets	7,452	6,897.4
Liabilities and equity
Debt	3,492.9	3,409
Finance lease liabilities	156.9	29.1
Operating lease liabilities	178.8	249.1
Construction costs payable	129.7	133
Accounts payable and accrued expenses	192.8	151.3
Dividends payable	68.1	63.3
Deferred revenue and prepaid rents	235	174.1
Deferred tax liability	39.8	53
Other liabilities	34.3	77.3
Total liabilities	4,528.3	4,339.2
Commitment and contingencies
Stockholders' equity
Preferred stock, $.01 par value, 100,000,000 authorized; no shares issued or outstanding	0	0
Common stock, $.01 par value, 500,000,000 shares authorized and 129,554,609 and 120,442,521 shares issued and outstanding at December 31, 2021 and 2020, respectively	1.3	1.2
Additional paid in capital	4,145.1	3,537.3
Accumulated deficit	(1,200.1)	(966.6)
Accumulated other comprehensive loss	(22.6)	(13.7)
Total stockholders’ equity	2,923.7	2,558.2
Total liabilities and equity	$ 7,452	$ 6,897.4

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1.4	$ 3.5
Accumulated amortization	$ 280.1	$ 249.3
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	129,554,609	120,442,521
Common stock, shares outstanding (in shares)	129,554,609	120,442,521

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 1,205.7	$ 1,033.5	$ 981.3
Operating expenses:
Property operating expenses	531.1	411.6	383.4
Sales and marketing	14.9	18.3	20.2
General and administrative	101.9	99.3	83.5
Depreciation and amortization	499.2	449.4	417.7
Transaction, acquisition, integration and other related expenses	21.3	3.7	8.4
Impairment losses and (gain) loss on asset disposals, net	(2)	11.1	1.1
Total operating expenses	1,166.4	993.4	914.3
Operating income	39.3	40.1	67
Interest expense, net	(64.6)	(57.7)	(82)
Gain on marketable equity investment	2.4	89.5	132.3
Loss on early extinguishment of debt	0	(6.5)	(71.8)
Foreign currency and derivative gains (losses), net	43.6	(27.6)	(7.5)
Other expense	(0.3)	0	(0.3)
Net income before income taxes	20.4	37.8	37.7
Income tax benefit	4.9	3.6	3.7
Net income	$ 25.3	$ 41.4	$ 41.4
Weighted average number of common shares outstanding - basic (in shares)	123.8	117.3	112.1
Weighted average number of common shares outstanding - diluted (in shares)	123.9	117.6	112.5
Income (loss) per share - basic (in dollars per share)	$ 0.20	$ 0.35	$ 0.36
Income (loss) per share - diluted (in dollars per share)	$ 0.20	$ 0.35	$ 0.36

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 25.3	$ 41.4	$ 41.4
Other comprehensive income (loss):
Foreign currency translation adjustment	(52.3)	40.5	11.8
Net gain (loss) on cash flow hedging instruments	43.4	(53)	(0.7)
Comprehensive income	$ 16.4	$ 28.9	$ 52.5

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated DeficitCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Total Stockholders' Equity	Total Stockholders' EquityCumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2018		108.3
Beginning Balance at Dec. 31, 2018		$ 1.1	$ 2,837.4	$ (600.2)		$ (12.3)	$ 2,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 41.4			41.4			41.4
Issuance of common stock, net (in shares)		6.5
Issuance of common stock, net			357.2				357.2
Stock-based compensation expense			16.7				16.7
Tax payment upon exercise of equity awards			(9.3)				(9.3)
Foreign currency translation adjustment	11.8					11.8	11.8
Net gain on cash flow hedging instruments	$ (0.7)					(0.7)	(0.7)
Dividends declared				(218)			(218)
Ending Balance (in shares) at Dec. 31, 2019		114.8
Ending Balance at Dec. 31, 2019		$ 1.1	3,202	(767.3)		(1.2)	2,434.6
Ending Balance (Impact of adoption of ASU 2016-02 related to leases) at Dec. 31, 2019					$ 9.5			$ 9.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List] | Impact of adoption of ASU 2016-02 related to leases	Impact of adoption of ASU 2016-02 related to leases
Net income	$ 41.4			41.4			41.4
Issuance of common stock, net (in shares)		5.6
Issuance of common stock, net		$ 0.1	325.6				325.7
Stock-based compensation expense			18.4				18.4
Tax payment upon exercise of equity awards			(8.7)				(8.7)
Foreign currency translation adjustment	40.5					40.5	40.5
Net gain on cash flow hedging instruments	(53)					(53)	(53)
Dividends declared				(240.7)			(240.7)
Ending Balance (in shares) at Dec. 31, 2020		120.4
Ending Balance at Dec. 31, 2020	$ 2,558.2	$ 1.2	3,537.3	(966.6)		(13.7)	2,558.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-02 [Member]
Net income	$ 25.3			25.3			25.3
Issuance of common stock, net (in shares)		9.2
Issuance of common stock, net		$ 0.1	597.6				597.7
Stock-based compensation expense			22.6				22.6
Tax payment upon exercise of equity awards			(12.4)				(12.4)
Foreign currency translation adjustment	(52.3)					(52.3)	(52.3)
Net gain on cash flow hedging instruments	43.4					43.4	43.4
Dividends declared				(258.8)			(258.8)
Ending Balance (in shares) at Dec. 31, 2021		129.6
Ending Balance at Dec. 31, 2021	$ 2,923.7	$ 1.3	$ 4,145.1	$ (1,200.1)		$ (22.6)	$ 2,923.7

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 2.06	$ 2.02	$ 1.92

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 25.3	$ 41.4	$ 41.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	499.2	449.4	417.7
(Recovery)/provision for bad debt expense	(1.5)	1.7	1.7
Gain on marketable equity investment	(2.4)	(89.5)	(132.3)
Foreign currency and derivative (gains) losses, net	(43.6)	27.6	7.5
Proceeds from swap terminations	0	2.9	3.6
Impairment losses and (gain) loss on asset disposals, net	(2)	11.1	1.1
Loss on early extinguishment of debt	0	6.5	71.8
Interest expense amortization, net	7.8	6.8	5
Stock-based compensation expense	22.6	18.4	16.7
Deferred income tax benefit	(9)	(6.9)	(7.5)
Operating lease cost	20.8	20.4	20.3
Other expense	0.2	0.1	0.2
Change in operating assets and liabilities:
Rent and other receivables, net and other assets	(111.8)	(58)	(74.2)
Accounts payable and accrued expenses	33.8	39	(0.8)
Deferred revenue and prepaid rents	62.5	8.8	15.6
Operating lease liabilities	(24.3)	(23.4)	(22.1)
Net cash provided by operating activities	477.6	456.3	365.7
Cash flows from investing activities:
Investments in real estate	(727)	(910.5)	(876.4)
Deposits for contract obligations	(193.4)	0	0
Proceeds from sale of equity investments	46.6	144.1	199
Equity investments	(7.4)	(6.5)	(3.8)
Proceeds from the sale of real estate assets	5.6	0.5	1.3
Net cash used in investing activities	(875.6)	(772.4)	(679.9)
Cash flows from financing activities:
Issuance of common stock, net	597.7	325.7	357.2
Dividends paid	(253.9)	(236.2)	(210.4)
Proceeds from revolving credit facility	173.4	763.7	656.7
Repayments of revolving credit facility	(610.5)	(966.1)	(182.5)
Proceeds from Euro bond	603.1	553.5	0
Proceeds from unsecured term loan	0	1,100	0
Repayments of unsecured term loan	0	(1,400)	(200)
Proceeds from issuance of senior notes	0	395.2	1,197.4
Repayments of senior notes	0	0	(1,200)
Payment of debt extinguishment costs	0	0	(72)
Payment of deferred financing costs	(5.1)	(16.4)	(9.4)
Payments on finance lease liabilities	(4.4)	(3.5)	(2.9)
Tax payment upon exercise of equity awards	(12.4)	(8.7)	(9.3)
Net cash provided by financing activities	487.9	507.2	324.8
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(15.2)	4.1	2.7
Net increase in cash, cash equivalents and restricted cash	74.7	195.2	13.3
Cash, cash equivalents and restricted cash at beginning of period	272.9	77.7	64.4
Cash, cash equivalents and restricted cash at end of period	347.6	272.9	77.7
Supplemental disclosure of cash flow information:
Cash paid for interest, including amounts capitalized of $20.0 million, $22.6 million and $32.9 million in 2021, 2020 and 2019, respectively	73.6	62.4	123
Cash paid for income taxes	4.5	3.7	3.5
Non-cash investing and financing activities:
Construction costs payable	129.7	133	176.3
Dividends payable	$ 68.1	$ 63.3	$ 58.6

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Cash Flows [Abstract]
Capitalized interest	$ 20	$ 22.6	$ 32.9

Description of Business

Description of Business	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business CyrusOne Inc., together with CyrusOne GP (the "General Partner"), a wholly-owned subsidiary of CyrusOne Inc., through which CyrusOne Inc. owns CyrusOne LP (the "Operating Partnership") and the subsidiaries of the Operating Partnership (collectively, “CyrusOne”, “we”, “us”, “our”, and the “Company”) is an owner, operator and developer of enterprise-class, carrier-neutral, multi-tenant and single-tenant data center properties. As of December 31, 2021, all of the issued and outstanding operating partnership units of CyrusOne LP are owned, directly or indirectly, by the Company except for de minimis holdings by certain officers and employees of the Company of LTIP Units (as described below) in CyrusOne LP as a result of awards granted under the LTIP (as defined below). Our customers operate in a number of industries, including information technology, financial services, energy, oil and gas, mining, medical, research and consulting services, and consumer goods and services. We currently operate 56 data centers, including one recovery center, located in the United States, United Kingdom, Germany, The Netherlands, The Republic of Ireland and France. On January 24, 2013, the Company completed its initial public offering (the "IPO") of common stock and its common stock currently trades on the NASDAQ Exchange under the ticker symbol "CONE". On November 14, 2021, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Calvary Parent L.P., a Delaware limited partnership (“Parent”), and Cavalry Merger Sub LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (“Merger Sub”), pursuant to which, subject to the terms and conditions of the Merger Agreement, Merger Sub will be merged with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent. Parent and Merger Sub were formed solely for the purpose of entering into the Merger Agreement and related agreements and consummating the transactions contemplated thereby, and Parent is controlled by funds affiliated with Kohlberg Kravis Roberts & Co. L.P. ("KKR") and Global Infrastructure Management, LLC ("GIP"). Subject to the terms and conditions of the Merger Agreement, the outstanding shares of common stock of the Company at the effective time of the Merger will be acquired for $90.50 per share in an all-cash transaction. The Merger and the other transactions contemplated by the Merger Agreement (the “Merger Transactions”) are subject to customary closing conditions, including the receipt of the required regulatory approvals and the satisfaction or waiver of the other conditions to the Merger described in the Merger Agreement. The Merger Transactions are expected to close during the second quarter of 2022, but there can be no assurances regarding whether the Merger Transactions will close as expected, or at all. The Company’s stockholders voted to approve the Merger, the Merger Agreement and the other transactions contemplated by the Merger Agreement at a special meeting of stockholders held for that purpose on February 1, 2022. Additionally, the waiting period applicable to the Merger Transactions under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, expired on December 29, 2021.

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying financial statements are prepared on a consolidated basis. In addition, the accompanying financial statements have been prepared in accordance with generally accepted accounting principles in the U.S. (GAAP) and include the accounts of the Company, as well as all wholly-owned subsidiaries and any consolidated variable interest entities. All intercompany transactions and balances have been eliminated in consolidation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Risks and Uncertainties We continue to monitor the global outbreak of the novel coronavirus (COVID-19) and to take steps to mitigate the potential risks to us posed by the pandemic. We provide a critical service to our customers and are considered an essential business by most governments. While the impact of the pandemic on our business has not been significant to date, we are unable to predict its future impact on our business, financial condition, results of operations, cash flows and ability to pay dividends as well as the market price of our common stock. Investment in Real Estate Acquisition of Properties Investment in real estate consists of land, buildings, improvements and integral equipment utilized in our data center operations. We expect most acquisitions to be an acquisition of assets rather than a business combination as our typical acquisitions consist of properties whereby substantially all the fair value of gross assets acquired is concentrated in a single asset set (land, building and in-place leases), which are treated as asset acquisitions. See Business Combinations and Asset Acquisitions herein. Business Combinations and Asset Acquisitions We evaluate whether an acquisition is a business combination or an asset acquisition by determining whether the set of assets is a business. Asset Acquisitions When substantially all of the fair value of gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the transaction is accounted for as an asset acquisition. Asset acquisitions are recorded at the cumulative acquisition costs and allocated to the assets acquired and liabilities assumed on a relative fair value basis. The Company allocates the purchase price of real estate to identifiable tangible assets such as land, building, land improvements and tenant improvements acquired based on their fair value. In estimating the fair value of each component, management considers appraisals, replacement cost, its own analysis of recently acquired and existing comparable properties, market rental data and other related information. Transaction costs associated with asset acquisitions are capitalized. Business Combinations When substantially all of the fair value is not concentrated in a group of similar identifiable assets, the set of assets will generally be considered a business and the Company applies acquisition accounting for business combinations, where all tangible and identifiable intangible assets acquired and all liabilities assumed are recorded at fair value. Any excess purchase price is recorded as goodwill. Transaction costs associated with business combinations are expensed as incurred. The following discussion applies to our initial determination of fair value and the resulting subsequent accounting which is generally applicable to both asset acquisitions and business combinations. The fair value of any tangible real estate assets acquired is determined by valuing the building as if it were vacant, and the fair value is then allocated to land, buildings, equipment and improvements based on available information including replacement cost, appraisal or using net operating income capitalization rates, discounted cash flow analysis or similar fair value models. We determine in-place lease values based on our evaluation of the specific characteristics of each tenant’s lease agreement and by applying a fair value model. The estimates of fair value of in-place leases include an estimate of carrying costs during the expected lease up periods considering current market conditions. In estimating fair value of in-place leases, we consider items such as real estate taxes, insurance, leasing commissions, tenant improvements and other operating expenses to execute similar leases as well as projected rental revenue and carrying costs during the expected lease up period. We amortize the value of in-place leases acquired to expense over the approximate weighted average remaining term of the leases, adjusted for projected tenant turnover, on a composite basis. We determine the value of above-market and below-market in-place leases for acquired properties based on the present value (using an interest rate that reflects the risks associated with the leases acquired) of the difference between (1) the contractual amounts to be paid pursuant to the in-place leases and (2) estimates of current market lease rates for the corresponding in-place leases, measured over a period equal to (i) the remaining non-cancellable lease term for above-market leases, or (ii) the remaining non-cancellable lease term plus any renewal options that we consider are reasonably certain that a lessee will execute such renewal option when a lease commences. We record the fair value of above-market and below-market leases as intangible assets or liabilities, and amortize them as an adjustment to revenue over the lease term. We determine the fair value of assumed debt by calculating the net present value of the scheduled debt service payments using current market-based terms for interest rates for debt with similar terms that management believes we could obtain on similar structures and maturities. Any difference between the fair value and stated value of the assumed debt is recorded as a discount or premium and amortized over the remaining term of the loan. In a business combination, we retain the previous lease classification unless there is a lease modification and that modification is not accounted for as a separate new lease. We elected to apply the short-term lease measurement and recognition exemption available under the new accounting standard for leases (discussed below in Note 4, Recently Issued Accounting Standards) to leases that have a remaining lease term of 12 months or less at the acquisition date, and accordingly, do not recognize an intangible asset if the terms of an operating lease are favorable relative to market terms, or a liability if the terms are unfavorable relative to market terms. Leasehold improvements are amortized over the shorter of the useful life of the assets and the remaining lease term at the date of acquisition. Capitalization of Costs We capitalize costs directly related to the development, pre-development or improvement of our investment in real estate, referred to as capital projects and other activities included within this paragraph. Costs associated with our capital projects are capitalized as incurred. If the project is abandoned, these costs are expensed during the period in which the project is abandoned. Costs considered for capitalization include, but are not limited to, construction costs, interest, real estate taxes, insurance and utilities, if appropriate. We capitalize indirect costs such as personnel, office and administrative expenses that are directly related to our development projects based on an estimate of the time spent on the construction and development activities. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. We determine when the capitalization period begins and ends through communication with project and other managers responsible for the tracking and oversight of individual projects. In the event that the activities to ready the asset for its intended use are suspended, the capitalization period will cease until such activities are resumed. In addition, we capitalize incremental initial direct costs incurred for successful origination of new leases which include internal and external leasing commissions. Interest expense is capitalized based on actual qualifying capital expenditures from the period when development commences until the asset is ready for its intended use, at the weighted average borrowing rate during the period. These costs are included in Investment in real estate and depreciated over the estimated useful life of the related assets. Costs incurred for maintaining and repairing our properties, which do not extend their useful lives, are expensed as incurred. Impairment Losses When events or circumstances indicate that the carrying amount of a real estate investment may not be recoverable, we review the carrying value of the asset. When such impairment indicators exist, we review an estimate of the undiscounted future cash flows expected to result from the use of the real estate investment and proceeds from its eventual disposition and compare such amount to the carrying value of the real estate investment. If our undiscounted cash flows indicate that we are unable to recover the carrying value of the real estate investment, an impairment loss is recognized. An impairment loss is measured as the amount by which the real estate investment's carrying value exceeds its estimated fair value. We recorded an impairment loss of $0.5 million for equipment held for use in inventory based on the book value of the abandoned equipment for the year ended December 31, 2021. We recognized an impairment loss of $11.2 million for the year ended December 31, 2020 which included an $8.8 million impairment loss based on our estimate of the decrease in the fair value of the equipment held for use in inventory at our U.S. data centers and a $2.4 million impairment loss based on the estimated fair value for our investment in land held in Atlanta for future development as the Company sold this land to a third-party in February 2021. We recognized an impairment loss of $0.7 million for the year ended December 31, 2019, primarily due to an impairment loss on our South Bend - Monroe facility, which was being actively marketed for sale. These fair values were based on unobservable inputs and the determination of fair value of real estate assets to be held for use is derived using the discounted cash flow method and involves a number of management assumptions relating to future economic events that could materially affect the determination of the ultimate fair value. Such assumptions are Level 3 inputs and include, but are not limited to, projected vacancy rates, rental rates, property operating expenses and required capital expenditures. These factors require management's judgment of factors such as market knowledge, historical experience, lease terms, tenant financial strength, economy, demographics, environment, property location, age, physical condition and expected return requirements, among other things. The aforementioned factors are taken as a whole by management in the determination of fair value. See Fair Value Measurements below for further information on fair value. Cash and Cash Equivalents and Restricted Cash Cash and cash equivalents include all non-restricted cash held in financial institutions and other non-restricted highly liquid short-term investments with original maturities of three months or less. Restricted cash includes cash equivalents restricted by contract or regulation, including letters of credit. Equity Investments We hold investments in various joint ventures where the Company evaluates its ability to influence the operating or financial decisions of the investee in applying the appropriate method of accounting for such investments. Influence tends to be more effective as the investor's percent of ownership in the voting rights of the investee increases. Our equity investments represent less than 20% of the voting rights of the investees and we do not exercise influence over the investee's operating and financial decisions. Accordingly, we do not account for our equity investments using the equity method of accounting. For further information about our equity investments, see Note 8, Equity Investments. During January 2021, we disposed of our remaining investment in GDS Holdings Limited ("GDS"). Prior to its disposal, it was classified as available for sale and carried at fair value. Changes in the fair value were reported as a component of net income in Gain on marketable equity investment. Our other equity investments are carried at cost because we do not exercise influence over the operating and financial decisions of the ventures and there is no readily determinable fair value and our investments are recorded at cost less impairment, if any. Dividends paid from operating profits are reported as a component of net income, while other dividends are reported as a return of capital. Goodwill We evaluate goodwill for possible impairment at least annually or upon the occurrence of events or circumstances that indicate that they would more likely than not reduce the fair value of a reporting unit below its carrying amount. For our annual impairment evaluation, we have the option of performing a qualitative or quantitative goodwill impairment analysis. A qualitative analysis, step zero, analyzes the macro-economic environment in which we operate for any significant changes such as deterioration in the market that the Company operates or overall financial performance such as declining cash flows. Also, entity specific changes are analyzed such as change in management, strategy or composition of reporting unit. This assessment of qualitative factors serves as a basis for determining whether it is necessary to perform the step one test. A quantitative analysis, step one, requires the Company to estimate the fair value of the reporting unit and compare the fair value to the carrying value to identify whether the value of the recorded goodwill is impaired. Changes in certain assumptions could have a significant impact on the impairment test for goodwill under step one. The most critical assumptions are projected future growth rates, operating margins, capital expenditures, tax rates, terminal values and discount rates. These assumptions are subject to change as our long-term plans and strategies are updated each year. During the fourth quarters of 2021, 2020 and 2019, we performed a qualitative evaluation and determined that the fair value of the reporting unit is substantially in excess of the carrying amount and therefore determined that further quantitative impairment testing was not necessary. Rent and Other Receivables Receivables consist principally of rent receivables including straight-line rent receivables. A general reserve may be recognized as an allowance for doubtful accounts when collectibility is not probable, after applying the overall collectibility constraint under the new accounting standard for leases. Straight-line rent receivable, net was $174.1 million and $172.6 million at December 31, 2021 and 2020, respectively. The allowance for doubtful accounts is estimated based upon historic patterns of credit losses for aged receivables as well as specific provisions for certain identifiable, potentially uncollectible balances. Deferred Revenue and Prepaid Rents Deferred revenue is recorded when a customer makes a contractual payment in excess of revenues recognized in accordance with GAAP. Prepaid rent liability is recorded when a customer makes an advance payment or they are contractually obligated to pay any amounts in advance of the associated lease or service period. Revenue Recognition Our revenue consists of lease revenue and revenue from contracts with customers. Lease Revenue: Our leasing revenue primarily consists of colocation rent, metered power reimbursements and interconnection revenue and is accounted for under Accounting Standards Codification ("ASC") 842, Leases ("ASC 842"). We generally are not entitled to reimbursements for rental expenses including real estate taxes, insurance or other common area operating expenses. a. Colocation Rent Revenue Colocation rent revenues, including interconnection revenue, are fixed minimum lease payments generally billed monthly in advance based on the contracted power or leased space. Some contracts may provide initial free rent periods and rents that escalate over the term of the contract. If rents escalate without the lessee gaining access to or control over additional leased power or space at the beginning of the lease term, the rental payments are recognized as revenue on a straight-line basis over the term of the lease. If rents escalate because the lessee gains access to and control over additional power and or leased space, revenue is recognized in proportion to the additional power or space in the periods that the lessee has control over the use of the additional power or space. The excess of revenue recognized over amounts contractually due is recognized as a straight-line receivable, which is included in Rent and other receivables in our Consolidated Balance Sheet. Some of our leases are structured on a gross basis in which the customer pays a fixed amount for colocation space and power. The revenue for these types of leases is recorded in colocation rent revenue. b. Metered Power Reimbursements Revenue Some of our leases provide that the customer is separately billed for power based upon actual or estimated metered usage generally at rates then in effect. Metered power reimbursement revenue is variable lease payments generally billed one month in arrears, and an estimate of this revenue is accrued in the month that the associated power is provided and recorded in metered power reimbursements revenue. Revenue from Contracts with Customers Revenue from our managed services, equipment sales, installations and other services are recognized under ASC 606, Revenue from Contracts with Customers ("ASC 606"). Equipment sold by us generally consists of servers, switches, networking equipment, cable infrastructure and cabinets. Revenue is recognized at a point-in-time when control of the equipment transfers to the customer from the Company, which generally occurs upon delivery to the customer. Managed services include providing a full-service managed data center, monitoring customer computer equipment, managing backups and storage, utilization reporting and other related ancillary information technology services. Management service contracts generally range from one Installation services include mounting, wiring, and testing of customer owned equipment. The installation period is typically short term in duration, and accordingly, revenue from the installation of customer equipment is recognized at a point-in-time once the installation is complete and the performance obligation is satisfied. Other services generally include installation of customer equipment, performing customer system re-boots, server cabinet and cage management, power monitoring, shipping and receiving, resolving technical issues, and other services requested by the customer. Other service revenue is measured based on the consideration specified in the contract and recognized over time as we satisfy the performance obligation. We adopted the practical expedient in ASC 606 that allows the Company to not disclose information about remaining performance obligations that have original expected durations of one year or less, the amount of the transaction price allocated to the remaining performance obligations and when we expect to recognize that amount as revenue for the year. We have also adopted the “as invoiced” practical expedient, whereby the Company recognizes revenue in the amount that directly corresponds to the amount of value transferred to the customer. Contract assets were $0.5 million and $0.4 million as of December 31, 2021 and December 31, 2020, respectively. Contract liabilities were not material as of both December 31, 2021 and December 31, 2020. Depreciation and Amortization Expense Depreciation expense is recognized over the estimated useful lives of real estate applying the straight-line method. The useful life of leased real estate and leasehold improvements is the lesser of the economic useful life of the asset or the term of the lease, including optional renewal periods if renewal is reasonably certain. Amortization expense is recognized over the estimated useful lives of finite-lived intangibles. Finite-lived intangibles include trademarks, customer relationships, favorable leasehold interests, in-place leases, trade names and deferred leasing costs. See Note 9, Goodwill, Intangible and Other Long-Lived Assets, for details. Foreign Currency Translation and Transactions The financial position of foreign subsidiaries is translated at the exchange rates in effect at the end of the period, while revenues and expenses are translated at average exchange rates during the period. Gains or losses from translation of foreign operations where the local currency is the functional currency are included as components of Other comprehensive income (loss). Gains or losses from foreign currency transactions are included in determining net income. Stock-Based Compensation We have a stock-based incentive award plan for our employees and directors. Stock-based compensation expense associated with these awards is recognized in General and administrative expenses, Property operating expenses and Sales and marketing expenses in our Consolidated Statements of Operations. We measure stock-based compensation at the estimated fair value on the grant date and recognize the amortization of stock-based compensation expense over the requisite service period. Fair value is determined based on assumptions related to stock volatility, risk-free rate of return and estimates of market and company performance. Fair Value Measurements Fair value measurements are utilized in accounting for business combinations, asset acquisitions, testing of goodwill and other long-lived assets for impairment, recording unrealized gain on available-for-sale securities, derivatives and related disclosures. Fair value of financial and non-financial assets and liabilities is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The three-tier hierarchy that prioritizes certain inputs used in the methodologies of measuring fair value for asset and liabilities, is as follows: Level 1—Observable inputs for identical instruments such as quoted market prices; Level 2—Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs); and Level 3—Unobservable inputs that reflect our determination of assumptions that market participants would use in pricing the asset or liability. These inputs are developed based on the best information available, including our own data. Derivative Instruments We primarily hedge our foreign currency risk by borrowing in the currencies in which we invest. We may use derivative financial instruments, such as cross-currency swaps to manage foreign currency exchange rate risk related to both our foreign investments and the related earnings. In addition, we occasionally use interest rate swap contracts to manage interest rate risk and limit the impact of future interest rate changes on earnings and cash flows, primarily related to variable-rate debt. Derivative instruments are measured at fair value and recorded in Other assets and Other liabilities, depending on our rights or obligations under the applicable derivative contract. Derivatives that are not designated as hedges must be adjusted to fair value through earnings. Designated Derivatives. We may choose to designate our derivative financial instruments, generally cross-currency swaps as net investment hedges in foreign operations. At inception of the transaction, we designate the derivative financial instrument as a hedge of a specific underlying exposure, including the risk management objective and the strategy for undertaking the hedge transaction. We formally assess both at inception and at least quarterly thereafter, the effectiveness of our hedging transactions. Due to the high degree of effectiveness between the hedging instruments and the underlying exposures hedged, fluctuations in the value of the derivative financial instruments will generally be offset by changes in the cash flows or fair values of the underlying exposures being hedged. In addition to the net investment hedges described above, we may issue debt in a currency that is not the same functional currency of the borrowing entity to hedge our international investments. We designate the debt and related accrued interest as a net investment hedge to offset the translation and economic exposures related to our international investments. If the debt and related accrued interest exceeds the designated amount of our international investment, the foreign currency remeasurement on the unhedged portion of the debt during the period is recognized in Foreign currency and derivative gains (losses), net. For cash flow hedges, such as interest rate swaps, we report the effective portion of the gain or loss as a component of Other comprehensive income (loss) and reclassify it to the applicable line item in the Consolidated Statements of Operations, generally Interest expense, net over the corresponding period of the underlying hedged item. The ineffective portion of a derivative financial instrument’s change in fair value is recognized in earnings, generally Interest expense, net at the time the ineffectiveness occurred. To the extent the hedged debt related to our interest rate swaps and forwards is paid off early, we write off the remaining balance in Other comprehensive income (loss) and recognize the amount in Interest expense, net in the Consolidated Statements of Operations. Undesignated Derivatives . Derivative instruments, such as cross-currency swaps, for which hedge accounting is not applied are recorded at fair value in Other assets and Other liabilities and gains and losses resulting from changes in the fair value are reported in Foreign currency and derivative gains (losses), net in the Consolidated Statements of Operations. In addition, we may choose to not designate our interest rate swap and forward contracts. If a swap or forward contract is not designated as a hedge, the changes in fair value of these instruments is immediately recognized in earnings in Interest expense, net in the Consolidated Statements of Operations. Segment Information Our data centers have similar revenues and operating expenses across all geographic locations. The service offerings and delivery of services are provided in a similar manner, using the same types of facilities and similar technologies. Our chief operating decision maker, the Company's Chief Executive Officer, reviews our financial information on an aggregate basis and makes decisions about the allocations of Company resources and as a result, we have one reportable business segment. Revenues from properties were $1,205.7 million, $1,033.5 million and $981.3 million for the years ended December 31, 2021, 2020 and 2019, respectively. We had Investment in real estate, net of $5.6 billion and $5.3 billion as of December 31, 2021 and 2020, respectively. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to use judgment in the application of accounting policies, including making estimates and assumptions. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different or different assumptions were made, it is possible that different accounting policies would have been applied, resulting in different financial results or a different presentation of our financial statements. Estimates, judgments and assumptions are based on historical experiences that we believe to be reasonable under the circumstances. From time to time we re-evaluate those estimates and assumptions. Our discussion and analysis of financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with GAAP. Our management evaluates these estimates on an ongoing basis, based upon information currently available and on various assumptions management believes are reasonable as of the date of the financial statements. Significant estimates include and are related to determining lease terms and revenue recognition, the fair value for purchase price allocations for business combinations and asset acquisitions, capitalization of costs and the useful lives of real estate and other long-lived assets. Our actual results may differ from these estimates.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	12 Months Ended
	Dec. 31, 2021
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Standards	Recently Issued Accounting Standards Recently Adopted Accounting Pronouncements Income Taxes On January 1, 2021, we adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which simplifies various aspects related to the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. The adoption did not have a significant impact on the Company. Reference Rate Reform On March 12, 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04"). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the first quarter of 2021, we elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives in our financial statements consistent with past presentation. We continue to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur. Lease Modification Q&A Due to the business disruptions and challenges severely affecting the global economy caused by the COVID-19 pandemic, lessors may provide rent deferrals and other lease concessions to lessees. While the lease modification guidance in ASC 842, Leases, addresses changes to lease terms resulting from negotiations between the lessee and the lessor, this guidance did not contemplate concessions being so rapidly executed to address the impact from the COVID-19 pandemic on the lessor's business. In April 2020, FASB issued a question and answer document (the “Lease Modification Q&A”) focused on the application of lease accounting guidance to lease concessions provided as a result of the COVID-19 pandemic. Under the new accounting standard for leases, the Company must determine, on a lease by lease basis, if a lease concession resulted in a lease modification. The Lease Modification Q&A allows the Company, if certain criteria have been met, to bypass the lease by lease analysis, and instead elect to either apply the lease modification accounting framework or not, with such election applied consistently to leases with similar characteristics and circumstances. The adoption of this guidance has not had a material impact on our financial statements. Guarantor Financial Information In March 2020, the SEC amended Rule 3-10 of Regulation S-X to reduce and simplify financial disclosure requirements for issuers and guarantors of registered debt offerings. This new guidance replaces the previous requirement to provide condensed consolidating financial information in the registrant’s financial statements with a requirement to provide alternative financial disclosures in Item 7 "Management's Discussion and Analysis of Financial Condition and Results of Operations" or its financial statements. We adopted these amendments as of April 1, 2020, and the alternative disclosures are presented in Item 7 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the information previously included in the Notes to Consolidated Financial Statements has been removed. Intangibles-Goodwill and Other Internal-Use Software On January 1, 2020, we adopted ASU 2018-15, Intangibles Goodwill and Other Internal Use Software on a prospective basis. The adoption did not have a significant impact on the Company. Fair Value Measurement On January 1, 2020, we adopted ASU 2018-13, Fair Value Measurement, which changes the fair value measurement disclosure requirements of ASC 820, Fair Value Measurement. The amendments are part of the FASB’s disclosure framework project to improve the effectiveness of disclosures important to financial statement users including information about assets and liabilities measured at fair value in our Consolidated Balance Sheets. The adoption did not have a significant impact on the Company. Financial Instruments - Credit Losses On January 1, 2020, we adopted ASU 2016-13, Financial Instruments-Credit Losses (CECL), which requires certain financial assets to be presented at the net amount expected to be collected. CECL and its related amendments apply to our customer contract trade receivables, notes receivable and net investments in leases. Our Rent and other receivables are primarily comprised of rent receivables, which are not within the scope of this sub-topic. The adoption did not have a significant impact on the Company because of our limited exposure to financial instruments subject to this standard. Leases We adopted ASU 2016-02 (codified in ASC 842, Leases ) on January 1, 2019, applied the package of practical expedients included therein and utilized the modified retrospective transition method with the cumulative effect of transition recorded as an adjustment to retained earnings on the effective date. By applying the modified retrospective transition method, the presentation of financial information for periods prior to January 1, 2019 was not restated. We elected the package of practical expedients, which permits us to not reassess (1) whether any expired or existing contracts are or contain leases, (2) the lease classification for any expired or existing leases, and (3) the treatment of any initial direct costs for any existing leases as of the effective date. We did not elect the hindsight practical expedient, which permits entities to use hindsight in determining the lease term and assessing impairment. As a Lessee The ASU requires that a liability be recorded on the balance sheet for all leases where the reporting entity is a lessee, based on the present value of future lease obligations discounted based on the implicit rate or alternatively our incremental borrowing rate. The implicit rate is generally not determinable and, as a result, we use our incremental borrowing rate at the lease commencement date to determine the present value. We determine our incremental borrowing rate based on an estimate of our existing yield curve at the lease commencement. The rates are then adjusted for various factors to estimate the company’s secured rate, including the lease term and collateralization. The determination of our incremental borrowing rate requires judgment. A corresponding right-of-use ("ROU") asset will also be recorded. Amortization of the lease obligation and the ROU asset for leases classified as operating leases are on a straight-line basis. Leases classified as financing leases are required to be accounted for as financing arrangements similar to the accounting treatment for capital leases under ASC 840, Leases (the former accounting standard for all leases, ("ASC 840")). We elected the practical expedient to combine our lease and related non-lease components by asset class for our leases. We elected the practical expedient to not evaluate land easements not previously accounted for as leases prior to the entity’s adoption of the new accounting standard for leases. We elected to apply the short-term lease measurement and recognition exemption available for leases under the new accounting standard for leases that have an original lease term of 12 months or less. The adoption of ASC 842 had a significant impact on our Consolidated Balance Sheets due to the recognition of approximately $87.0 million of ROU assets and $123.2 million of lease liabilities for operating leases. We recognized a $9.5 million cumulative effect adjustment to retained earnings. The adjustment to retained earnings was driven principally by measurement of operating lease liabilities at the present value of the remaining lease payments at the adoption date of January 1, 2019. The increase was offset in part by impairment of ROU assets associated with one build-to-suit ("BTS") arrangement recognized as an operating lease under the new accounting standard for leases. Additionally, we de-recognized certain previously recognized BTS lease assets and liabilities which under the new accounting standard for leases are recognized as operating lease ROU assets and lease liabilities. Prior to the adoption of the new accounting standard for leases, these leases were accounted as financing arrangements or BTS leases assets and liabilities and recorded as buildings and improvement and lease financing arrangements. Prior to the adoption of the new accounting standard for leases, BTS lease assets were amortized over the useful life of the asset and recorded as amortization expense and accretion of BTS lease liability was recorded as an interest expense in the Consolidated Statements of Operations. Upon adoption of the new accounting standard for leases, BTS leases are accounted as operating leases and amortization and accretion of lease liabilities of these operating leases are recorded as lease expenses in property operating expenses in our Consolidated Statements of Operations. As a Lessor The accounting for lessors remained largely unchanged from ASC 840. However, the new accounting standard for leases requires that lessors expense certain costs to obtain a lease that are not incremental to origination of a lease. Upon adoption, initial direct costs that are not incremental are expensed as general and administrative expense in our Consolidated Statements of Operations. Prior to the adoption of the new standard, these costs were capitalizable. As a result of electing the package of practical expedients, initial direct costs have not been reassessed prior to the effective date and therefore adoption of the lease standard did not have an impact on our previously reported Consolidated Statements of Operations with respect to initial direct costs. In addition, under the new accounting standard for leases, certain exceptions under the previous standard for real estate no longer are applicable in the evaluation of the lease classification as an operating, sales type or direct financing lease. In the event that a real estate lease is classified as a sales-type lease, subject to certain conditions, a gain or loss is recognized based on the present value of the lease payments and residual value. We elected the practical expedient to combine all of our lease and nonlease revenue components into a single combined lease component as nonlease components have the same pattern of transfer as the related predominant operating lease components. Our customer leases include options to extend or terminate the lease agreements. We do not generally include extension or termination options in a customer’s lease term for lease classification purposes or for recognizing lease revenue unless we are reasonably certain the customer will exercise these extension or termination options at lease commencement. New Accounting Pronouncements Not Yet Adopted In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Topic 470) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Topic 815). This ASU reduces the number of accounting models for convertible debt instruments and convertible preferred stock, and amends the guidance for the derivatives scope exception for contracts in an entity's own equity. The ASU also amends and makes targeted improvements to the related earnings per share guidance. The ASU is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The standard allows for either modified or full retrospective transition methods. The Company is currently evaluating this ASU but does not expect it to have a significant impact on its financial statements.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Lease Revenue Lease revenue primarily consists of colocation rent and metered power reimbursements from the lease of our data centers. Colocation leases may include all or portions of a data center, where customers may also lease office space to support their colocation operations. Revenue is primarily based on power usage as well as square footage. Customer lease arrangements customarily contain provisions that allow for renewal or continuation on a month-to-month arrangement, and certain leases contain early termination rights. We do not include any of these extension or termination options in a customer’s lease term for lease classification purposes or for recognizing lease revenue unless we are reasonably certain the customer will exercise these extension or termination options at lease commencement. At lease commencement, early termination is generally not deemed probable due to the significant economic penalty incurred by the lessee to exercise its early termination right and to relocate their equipment installed in our facilities. Generally, our customer lease arrangements do not provide any option to purchase and are classified as operating leases. We have substantial revenue primarily related to lease revenue from one customer that represented approximately 19%, 19% and 21% of our total revenue for the years ended December 31, 2021, 2020 and 2019, respectively. At December 31, 2021, the future minimum lease payments to be received under non-cancellable operating leases, excluding month-to-month arrangements and metered power reimbursements are shown below (in millions): As of December 31, 2021 Minimum Lease Payments 2022 $ 827.1 2023 684.6 2024 551.9 2025 467.8 2026 369.9 Thereafter 1,018.2 Total $ 3,919.5 At December 31, 2020, the future minimum lease payments to be received under non-cancellable operating leases, excluding month-to-month arrangements and metered power reimbursements are shown below (in millions): As of December 31, 2020 Minimum Lease Payments 2021 $ 771.1 2022 658.5 2023 527.5 2024 409.3 2025 339.1 Thereafter 922.9 Total $ 3,628.4 Revenue from Contracts with Customers Revenue from equipment sales and the installation of customer equipment is recognized at a point-in-time. Title to such assets are transferred to the customer, and the benefits of the installation service are typically consumed at the completion of the service. Disaggregation of Revenue For the years ended December 31, 2021, 2020 and 2019, lease revenue disaggregated by primary revenue stream is as follows (in millions): Lease revenue Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Colocation (Minimum lease payments) $ 924.1 $ 842.1 $ 793.5 Metered power reimbursements (Variable lease payments) 259.0 161.4 138.8 Total lease revenue $ 1,183.1 $ 1,003.5 $ 932.3 For the years ended December 31, 2021, 2020 and 2019, revenue from contracts with customers disaggregated by primary revenue stream is as follows (in millions): Revenue from contracts with customers Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Equipment sales and services $ 4.2 $ 10.6 $ 29.7 Other revenue 18.4 19.4 19.3 Total revenue from contracts with customers $ 22.6 $ 30.0 $ 49.0 Other revenue related to contracts with customers in the table above includes managed services and other services revenue of $15.1 million, $15.9 million and $15.9 million for the years ended December 31, 2021, 2020 and 2019, respectively. Total revenues from contracts with customers generated from operations outside of the United States were $0.4 million, $4.7 million and $2.9 million for the years ended December 31, 2021, 2020 and 2019, respectively. Accounts receivable associated with revenue from contracts with customers were $0.8 million and $2.3 million as of December 31, 2021 and 2020, respectively.

Leases - As a Lessee

Leases - As a Lessee	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases - As a Lessee	Leases - As a Lessee ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. Variable lease payments consisting of non-lease components and services are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation is incurred. ASC 842 defines initial direct costs as only the incremental costs of signing a lease. Initial direct costs related to leasing that are not incremental are expensed as general and administrative expense in our Consolidated Statements of Operations. As a result of electing the package of practical expedients, initial direct costs incurred prior to January 1, 2019 (the effective date for ASC 842) have not been reassessed. Our operating lease agreements primarily consist of leased real estate and are included within Operating lease ROU assets and Operating lease liabilities on the Consolidated Balance Sheets. Many of our lease agreements include options to extend the lease, which are not included in our minimum lease payments unless they are reasonably certain to be exercised at lease commencement. Rental expense related to operating leases is recognized on a straight-line basis over the lease term. We operate six data center facilities and have a data center under development subject to finance leases. The remaining terms of our data center finance leases range from one The components of lease expense are as follows (in millions): Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Operating lease cost $ 20.8 $ 20.4 $ 20.3 Finance lease cost: Amortization of assets 2.0 2.1 2.3 Interest on lease liabilities 3.4 1.5 1.7 Total net lease cost $ 26.2 $ 24.0 $ 24.3 Supplemental balance sheet information related to leases is as follows (in millions, except lease term and discount rate): December 31, 2021 December 31, 2020 Operating leases: Operating lease right-of-use assets $ 143.7 $ 211.4 Operating lease liabilities $ 178.8 $ 249.1 Finance leases: Property and equipment, at cost $ 163.0 $ 34.7 Accumulated amortization (8.5) (7.1) Property and equipment, net $ 154.5 $ 27.6 Finance lease liabilities $ 156.9 $ 29.1 Weighted average remaining lease term (in years): Operating leases 16.4 14.3 Finance leases (a) 27.3 18.2 Weighted average discount rate: Operating leases 4.0 % 3.7 % Finance leases (a) 2.6 % 4.7 % (a) Excludes a 999-year ground lease in Dublin, The Republic of Ireland entered into during the third quarter of 2019. The Dublin property is under active development and the finance lease is included in Construction in progress, including land under development on the Consolidated Balance Sheets. Supplemental cash flow and other information related to leases is as follows (in millions): Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 24.3 $ 23.4 $ 22.1 Operating cash flows from finance leases 3.4 1.5 1.7 Financing cash flows from finance leases 4.4 3.5 2.9 Non-cash right-of-use assets obtained in exchange for lease liabilities: Operating leases $ — $ 65.2 $ 175.1 Finance leases 129.0 — 0.8 Maturities of lease liabilities were as follows (in millions): As of December 31, 2021 Operating Leases Finance Leases 2022 $ 25.6 $ 7.7 2023 20.8 6.7 2024 16.1 6.4 2025 14.4 6.6 2026 12.6 6.9 Thereafter 155.0 187.9 Total lease payments $ 244.5 $ 222.2 Less: Imputed interest (65.7) (65.3) Total lease obligations $ 178.8 $ 156.9 Maturities of lease liabilities were as follows (in millions): As of December 31, 2020 Operating Leases Finance Leases 2021 $ 27.8 $ 4.2 2022 27.9 3.0 2023 23.9 2.0 2024 19.4 1.4 2025 17.8 1.5 Thereafter 221.6 30.5 Total lease payments $ 338.4 $ 42.6 Less: Imputed interest (89.3) (13.5) Total lease obligations $ 249.1 $ 29.1
Leases - As a Lessee	Leases - As a Lessee ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. Variable lease payments consisting of non-lease components and services are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation is incurred. ASC 842 defines initial direct costs as only the incremental costs of signing a lease. Initial direct costs related to leasing that are not incremental are expensed as general and administrative expense in our Consolidated Statements of Operations. As a result of electing the package of practical expedients, initial direct costs incurred prior to January 1, 2019 (the effective date for ASC 842) have not been reassessed. Our operating lease agreements primarily consist of leased real estate and are included within Operating lease ROU assets and Operating lease liabilities on the Consolidated Balance Sheets. Many of our lease agreements include options to extend the lease, which are not included in our minimum lease payments unless they are reasonably certain to be exercised at lease commencement. Rental expense related to operating leases is recognized on a straight-line basis over the lease term. We operate six data center facilities and have a data center under development subject to finance leases. The remaining terms of our data center finance leases range from one The components of lease expense are as follows (in millions): Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Operating lease cost $ 20.8 $ 20.4 $ 20.3 Finance lease cost: Amortization of assets 2.0 2.1 2.3 Interest on lease liabilities 3.4 1.5 1.7 Total net lease cost $ 26.2 $ 24.0 $ 24.3 Supplemental balance sheet information related to leases is as follows (in millions, except lease term and discount rate): December 31, 2021 December 31, 2020 Operating leases: Operating lease right-of-use assets $ 143.7 $ 211.4 Operating lease liabilities $ 178.8 $ 249.1 Finance leases: Property and equipment, at cost $ 163.0 $ 34.7 Accumulated amortization (8.5) (7.1) Property and equipment, net $ 154.5 $ 27.6 Finance lease liabilities $ 156.9 $ 29.1 Weighted average remaining lease term (in years): Operating leases 16.4 14.3 Finance leases (a) 27.3 18.2 Weighted average discount rate: Operating leases 4.0 % 3.7 % Finance leases (a) 2.6 % 4.7 % (a) Excludes a 999-year ground lease in Dublin, The Republic of Ireland entered into during the third quarter of 2019. The Dublin property is under active development and the finance lease is included in Construction in progress, including land under development on the Consolidated Balance Sheets. Supplemental cash flow and other information related to leases is as follows (in millions): Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 24.3 $ 23.4 $ 22.1 Operating cash flows from finance leases 3.4 1.5 1.7 Financing cash flows from finance leases 4.4 3.5 2.9 Non-cash right-of-use assets obtained in exchange for lease liabilities: Operating leases $ — $ 65.2 $ 175.1 Finance leases 129.0 — 0.8 Maturities of lease liabilities were as follows (in millions): As of December 31, 2021 Operating Leases Finance Leases 2022 $ 25.6 $ 7.7 2023 20.8 6.7 2024 16.1 6.4 2025 14.4 6.6 2026 12.6 6.9 Thereafter 155.0 187.9 Total lease payments $ 244.5 $ 222.2 Less: Imputed interest (65.7) (65.3) Total lease obligations $ 178.8 $ 156.9 Maturities of lease liabilities were as follows (in millions): As of December 31, 2020 Operating Leases Finance Leases 2021 $ 27.8 $ 4.2 2022 27.9 3.0 2023 23.9 2.0 2024 19.4 1.4 2025 17.8 1.5 Thereafter 221.6 30.5 Total lease payments $ 338.4 $ 42.6 Less: Imputed interest (89.3) (13.5) Total lease obligations $ 249.1 $ 29.1

Investment in Real Estate

Investment in Real Estate	12 Months Ended
	Dec. 31, 2021
Real Estate [Abstract]
Investment in Real Estate	Investment in Real Estate All references to square footage, acres, and megawatts are unaudited. Land for future development During the year ended December 31, 2021, the Company purchased land for future development in Madrid, Spain; Amsterdam, The Netherlands; San Antonio, Texas and Frankfurt, Germany totaling 35 acres for $63.8 million. During the year ended December 31, 2020, the Company purchased land for future development in Frankfurt, Germany and London, United Kingdom totaling 35 acres for $58.0 million. Leases of real estate In February 2021, the Company entered into a 20-year lease comprising a 130,000 square feet building and commenced development of a 18 megawatt ("MW") data center in London, United Kingdom. We have three renewal options for 15 years each which were not reasonably certain at commencement and the lease was classified as an operating lease. In June 2021, the Company entered into lease amendments for the two data center leases located in London, United Kingdom to extend the lease terms. Per lease modification accounting rules under ASC 842, these leases were classified as finance leases on the modification effective date. Previously these leases were accounted as operating leases. The finance lease asset and liability are presented in Buildings and improvements and Finance lease liabilities in the Consolidated Balance Sheets, respectively. In March 2020, the Company entered into a 25-year lease comprising a 45,000 square feet building and commenced development of a 27 MW data center in Paris, France, which was preleased to a customer. We have one renewal option for 25 years which was not reasonably certain at commencement and the lease was classified as an operating lease. Real estate related capital expenditures Construction in progress was $765.9 million and $982.2 million, including land which was under active development of $28.0 million and $5.1 million as of December 31, 2021 and December 31, 2020, respectively. For the year ended December 31, 2021, our capital expenditures were $727.0 million, as shown on the statement of cash flows. Substantially all of our investing activity related to our development activities. Our capital expenditures for 2021 primarily related to the acquisition of land for future development and continued development in key markets, primarily in Northern Virginia, Frankfurt, Phoenix, Dublin, London, Somerset, Paris, San Antonio and Chicago. For the year ended December 31, 2020, our capital expenditures were $910.5 million, as shown on the statement of cash flows. Substantially all of our investing activity related to our development activities. Our capital expenditures for 2020 primarily related to the acquisition of land for future development and continued development in key markets, primarily in Dallas, Dublin, Frankfurt, Iowa, London, the New York Metro area, Northern Virginia, Paris, Phoenix, San Antonio and Santa Clara. We recorded an impairment loss of $0.5 million for equipment held for use in inventory based on the book value of the abandoned equipment for the year ended December 31, 2021. For the year ended December 31, 2020, impairment charges of $11.2 million were recognized which included an $8.8 million impairment loss based on our estimate of the decrease in the fair value of the equipment held for use in inventory at our U.S. data centers and a $2.4 million impairment loss based on the estimated fair value for our investment in land held in Atlanta for future development as the Company sold this land to a third-party.

Equity Investments

Equity Investments	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Equity Investments	Equity Investments The Company has the following equity investments where it has a noncontrolling interest in the investees (in millions): Equity Investments as of: Investees Equity Method December 31, 2021 December 31, 2020 GDS, Class A share equivalent Fair value $ — $ 44.2 ODATA investments Cost method 30.3 22.9 Equity investments $ 30.3 $ 67.1 The Company had an equity investment in GDS, a developer and operator of high-performance, large-scale data centers in China. We accounted for our equity investment in GDS using the fair value method. On October 18, 2017, the Company purchased newly issued unregistered ordinary shares equivalent to 8.0 million American depository shares (ADS) at a price per Class A ordinary share equivalent to $12.45 per ADS, a 4% discount to the October 17, 2017 closing price, for a total investment of $100.0 million. Each ADS was equivalent to eight ordinary shares. For the year ended December 31, 2020, we sold approximately 1.8 million GDS ADSs for total net proceeds of approximately $164.1 million with $19.9 million of the proceeds settled in 2021, which left us with approximately 0.5 million GDS ADSs remaining as a result of sales in the prior year period. During January 2021, we disposed of our remaining investment for net proceeds of $46.6 million. The Company recognized Gains on marketable equity investment in GDS ADSs held and sold as follows: IN MILLIONS Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Gain on marketable equity investment $ 2.4 $ 89.5 $ 132.3 Less: Gain recognized on marketable equity investment sold 2.4 69.6 66.7 Unrealized gain on marketable equity investment $ — $ 19.9 $ 65.6 The gain on investment is recognized in the Consolidated Statements of Operations in Gain on marketable equity investment. As of December 31, 2021 and 2020, the Company had a total investment of $30.3 million and $22.9 million, respectively, in four unconsolidated ventures in Brazil, Chile, Colombia and Mexico, with ODATA, a Brazilian headquartered company, specializing in providing colocation services to customers across multiple industries. In evaluating the appropriate accounting method for its ventures with ODATA, we considered our voting interests and ability to exercise significant influence over the operating and financial policies of each venture and concluded that the Company does not exercise significant influence and our investments are accounted for using the cost method. During the years ended December 31, 2021 and 2020, the Company made additional investments totaling $7.4 million and $6.5 million in ODATA, respectively.

Goodwill, Intangible and Other

Goodwill, Intangible and Other Long-Lived Assets	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Intangible and Other Long-Lived Assets	Goodwill, Intangible and Other Long-Lived Assets The carrying amount of goodwill was $455.1 million as of December 31, 2021 and 2020. Summarized below are the carrying values for the major classes of intangible assets: IN MILLIONS For the year ended December 31, 2021 2020 Weighted- Gross Accumulated Total Gross Accumulated Total Customer relationships 8 $ 247.1 $ (174.2) $ 72.9 $ 247.1 $ (163.1) $ 84.0 Trademark/tradename 3 11.5 (9.8) 1.7 11.6 (9.0) 2.6 Favorable leasehold interest 38 5.7 (2.1) 3.6 5.7 (1.6) 4.1 In-place customer leases 3 138.3 (92.8) 45.5 140.4 (74.6) 65.8 Above and below market leases 4 2.3 (1.2) 1.1 2.3 (1.0) 1.3 Total $ 404.9 $ (280.1) $ 124.8 $ 407.1 $ (249.3) $ 157.8 There were no goodwill or intangible asset impairments for the years ended December 31, 2021, 2020 or 2019. The fair value of goodwill and other intangibles is substantially in excess of carrying value for the years ended December 31, 2021, 2020 and 2019. Amortization expense for acquired intangible assets was $31.6 million, $38.9 million and $39.9 million for the years ended December 31, 2021, 2020 and 2019, respectively. The following table presents estimated amortization expense for each of the next five years and thereafter, commencing January 1, 2022: IN MILLIONS Total 2022 $ 29.2 2023 20.3 2024 18.6 2025 17.3 2026 9.3 Thereafter 30.1 Total $ 124.8

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets As of December 31, 2021 and 2020, the components of Other assets are as follows (in millions): December 31, 2021 December 31, 2020 Deposits for contract obligations $ 193.4 $ — Deferred leasing and other contract costs 87.0 62.4 Prepaid expenses 19.8 19.1 Non-real estate assets, net 12.3 13.8 Other assets 39.7 38.1 Total $ 352.2 $ 133.4 Non-real estate assets, net primarily consists of deposits for contract obligations related to non-cancellable contracted commitments for acquisition of equipment, administrative related software and computers and office equipment, which are depreciated or amortized over the shorter of the assets useful life or the lease term. Other assets primarily includes land deposits, fuel inventory, other receivables, deferred tax assets, net of allowance and other deferred costs. During the year ended

Debt

Debt	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Debt	Debt As of December 31, 2021 and 2020, the components of Debt are as follows (unless otherwise noted, interest rate and maturity date information are as of December 31, 2021) (in millions): December 31, 2021 December 31, 2020 Interest Rate Maturity Date Amended Credit Agreement: Revolving Credit Facility: March 2024 (b) EUR Revolver $ — $ 275.9 Monthly EURIBOR + 1.00% GBP Revolver — 157.0 Monthly LIBOR + 1.00% 2023 Term Loan Facility (a) 100.0 100.0 Monthly LIBOR + 1.20% March 2023 (c) 2025 Term Loan Facility (a) 700.0 700.0 Monthly LIBOR + 1.20% March 2025 2024 Notes, including bond discount of $0.6 million and $0.7 million, respectively 599.4 599.3 2.900 % November 2024 2027 Notes, including bond discount of $0.6 million and $0.6 million, respectively (d) 566.6 612.6 1.450 % January 2027 2028 Notes, including bond discount of $6.9 million (e) 560.3 — 1.125 % May 2028 2029 Notes, including bond discount of $1.4 million and $1.6 million, respectively 598.6 598.4 3.450 % November 2029 2030 Notes, including bond discount of $4.2 million and $4.7 million, respectively 395.8 395.3 2.150 % November 2030 Deferred financing costs (27.8) (29.5) — — Total $ 3,492.9 $ 3,409.0 (a) - Monthly USD LIBOR as of December 31, 2021 was 0.11%. (b) - The Company has an option to exercise a one (c) - The Company has an option to exercise two 1-year extension options, subject to certain conditions. (d) - The 2027 Notes represent €495.3 million, including bond discount of €0.7 million of Euro bonds. (e) - The 2028 Notes represent €489.2 million, including bond discount of €6.7 million, of Euro bonds. Credit facilities On March 31, 2020, CyrusOne LP, a Maryland limited partnership and subsidiary of CyrusOne Inc., entered into an amendment to its credit agreement, dated as of March 29, 2018 (as so amended, the “Amended Credit Agreement”), among the Operating Partnership, as borrower, the lenders party thereto (the “Lenders”) and JPMorgan Chase Bank, N.A., as administrative agent for the Lenders. Proceeds from the Amended Credit Agreement were used, among other things, to refinance and replace the credit facilities under a prior $3.0 billion credit facility. The Amended Credit Agreement provides for (i) a $1.4 billion senior unsecured multi-currency revolving credit facility (the “Revolving Credit Facility”), (ii) senior unsecured term loans due 2023 in a dollar equivalent principal amount of $400.0 million (the “2023 Term Loan Facility”), and (iii) senior unsecured term loans due 2025 in a principal amount of $700.0 million (the “2025 Term Loan Facility”). The Amended Credit Agreement also includes an accordion feature pursuant to which the Operating Partnership is permitted to obtain additional revolving or term loan commitments so long as the aggregate principal amount of commitments and/or term loans under the Amended Credit Agreement does not exceed $4.0 billion. The Revolving Credit Facility provides for borrowings in U.S. Dollars, Euros, Pounds Sterling, Canadian Dollars, Australian Dollars, Japanese Yen, Hong Kong Dollars, Singapore Dollars and Swiss Francs (subject to a sublimit of $750.0 million on borrowings in currencies other than U.S. Dollars). The Revolving Credit Facility matures on March 29, 2024 with one 12-month extension option. The 2023 Term Loan Facility matures on March 29, 2023 with two 1-year extension options, and the 2025 Term Loan Facility matures on March 28, 2025. The interest rates for borrowings under the Amended Credit Agreement are, at the option of the borrower, based on a floating rate or base rate, plus a margin determined by reference to a pricing grid based on the lower of (i) the rate corresponding to the then applicable credit rating for the Operating Partnership’s senior unsecured debt or (ii) the rate corresponding to the then applicable ratio of the Company’s consolidated total indebtedness to its gross asset value. The Amended Credit Agreement includes certain restricted covenants, requirements to maintain certain financial ratios, including with respect to unencumbered assets, and events of default. On March 31, 2020, borrowings of $1.3 billion under the Amended Credit Agreement were used to repay the $3.0 Billion Credit Facility, which consisted of a $1.7 billion revolving credit facility ("$1.7 Billion Revolving Credit Facility"), which included a $750.0 million multicurrency borrowing sublimit, a 5-year term loan with commitments totaling $1.0 billion and a $300.0 million 7-year term loan (collectively, the "$3.0 Billion Credit Facility"). The aggregate outstanding principal balance under the Amended Credit Agreement as of March 31, 2020, was $1.3 billion, and the Company recognized a loss on early extinguishment of debt of $3.4 million in connection with the repayment of the $3.0 Billion Credit Facility. The current administrator of LIBOR ceased to publish one-month GBP LIBOR after December 31, 2021 and will cease to publish USD LIBOR after June 30, 2023. GBP LIBOR has been replaced by the Sterling Overnight Index Average or SONIA. There is a risk that the LIBOR transition could increase our interest and other costs relative to our outstanding subordinated debt. We may not be able to refinance those instruments on terms that reduce those costs to the level we would have expected if the administrator of LIBOR were to continue publishing indefinitely. Also, the transition from LIBOR could impact or change our hedge accounting practices. We pay a facility fee calculated based on the aggregate revolving commitments. The facility fee rate varies based on ratings-based pricing levels, and is currently equal to 0.20% per annum of the aggregate revolving commitments. The facility fee was $2.8 million, $2.9 million and $2.6 million for the years ended December 31, 2021, 2020 and 2019, respectively. As of December 31, 2021, we had $100.0 million and $700.0 million outstanding under the 2023 Term Loan Facility and the 2025 Term Loan Facility, respectively, and additional borrowing capacity under the Amended Credit Agreement was approximately $1.4 billion, net of $8.4 million of outstanding letters of credit. We had no borrowings outstanding under the Revolving Credit Facility as of December 31, 2021. Senior notes Euro bonds On May 26, 2021, CyrusOne Europe Finance DAC, a designated activity company organized under the laws of Ireland (the "Issuer"), and an indirect subsidiary of the Company and wholly owned by the Operating Partnership, closed its offering of €500.0 million aggregate principal amount of 1.125% senior notes due May 2028 (the “2028 Notes”). The Company received proceeds of €490.8 million, net of discount, underwriting costs and other deferred financing costs. The Company used the proceeds to repay floating rate Euro and GBP denominated obligations and fund continued development in Europe. The Notes were issued in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”), to persons outside of the United States pursuant to Regulation S under the Securities Act. The Notes have not been and will not be registered under the Securities Act and may not be offered or sold within the United States or to United States persons (within the meaning of Regulation S under the Securities Act) absent registration or an applicable exemption from the registration requirements. The 2028 Notes are senior unsecured obligations of the Issuer guaranteed by CyrusOne LP and CyrusOne Inc., which rank equally in right of payment with all existing and future unsecured senior indebtedness of the Issuer. The 2028 Notes are effectively subordinated in right of payment to any future secured indebtedness, if any, to the extent of the value of the assets securing such indebtedness. The 2028 Notes may be redeemed at our option prior to their scheduled maturity dates at the prices and premiums and on the terms set forth in the respective indentures governing the notes. On January 22, 2020, the Operating Partnership and CyrusOne Finance Corp., a single-purpose finance subsidiary, both wholly-owned subsidiaries of the Company (together, the "Issuers"), completed a public offering of €500.0 million aggregate principal amount of 1.450% senior notes due January 2027 (the “2027 Notes”). The Company received proceeds of €495.3 million, net of discount, underwriting costs and other deferred financing costs. The Company used the proceeds to repay floating rate Euro denominated obligations and fund continued development in Europe. The 2027 Notes are senior unsecured obligations of the Issuers guaranteed by CyrusOne Inc., which rank equally in right of payment with all existing and future unsecured senior indebtedness of the Issuers. The 2027 Notes are effectively subordinated in right of payment to any future secured indebtedness, if any, to the extent of the value of the assets securing such indebtedness. The 2027 Notes may be redeemed at our option prior to their scheduled maturity dates at the prices and premiums and on the terms set forth in the respective indentures governing the notes. US bonds On September 21, 2020, the Issuers completed a public offering of $400.0 million aggregate principal amount of 2.150% senior notes due November 2030 (the "2030 Notes"). The Company received proceeds of $392.6 million, net of discount, underwriting costs and other deferred financing costs. The Company used the proceeds to repay $300.0 million of the outstanding indebtedness under the Operating Partnership's 2023 Term Loan Facility, to repay the then outstanding balance of $20.0 million on the US Revolver balance under the Revolving Credit Facility and the remainder for general corporate purposes. In connection with the repayment of outstanding indebtedness of the senior unsecured term loans due March 2023, the Company recognized a loss on early extinguishment of debt of $3.1 million during the year ended December 31, 2020. On December 5, 2019, the Issuers completed a public offering of $600.0 million aggregate principal amount of 2.900% senior notes due November 2024 (the "2024 Notes") and $600.0 million aggregate principal amount of 3.450% senior notes due November 2029 (the “2029 Notes”). The Company received proceeds of $1,197.4 million, net of discounts, underwriting costs and other deferred financing costs. The Company used the proceeds to finance the repurchase of all of its 5.000% senior notes due 2024 (the "Old 2024 Notes") and all of its 5.375% senior notes due 2027 (together with the Old 2024 Notes, the "Existing Notes"), including the payment of consent payments, for the redemption and discharge of Existing Notes that remained outstanding after the completion of the tender offers and consent solicitations, for the payment of related premiums, fees, discounts and expenses and for general corporate purposes. In connection with the repurchase of the Existing Notes, the Company recognized a loss on early extinguishment of debt of $71.8 million during the year ended December 31, 2019. The 2024 Notes, 2029 Notes and 2030 Notes are senior unsecured obligations of the Issuers guaranteed by CyrusOne Inc., which rank equally in right of payment with all existing and future unsecured senior indebtedness of the Issuers. The 2024 Notes, 2029 Notes and 2030 Notes are effectively subordinated in right of payment to any future secured indebtedness of the Issuers, if any, to the extent of the value of the assets securing such indebtedness. The 2024 Notes, 2029 Notes and 2030 Notes may be redeemed at our option prior to their scheduled maturity dates at the prices and premiums and on the terms set forth in the respective indentures governing the notes. Financial debt covenants Our debt agreements contain customary provisions with respect to events of default, affirmative and negative covenants and borrowing conditions. The most restrictive covenants are generally included in the Amended Credit Agreement. The Amended Credit Agreement requires us to maintain certain financial covenants including the following, in each case on a consolidated basis, a minimum fixed charge ratio, maximum total and secured leverage ratios, maximum net operating income to debt service ratio and a maximum ratio of unsecured indebtedness to unencumbered asset value. In order to continue to have access to amounts available under the Amended Credit Agreement, the Company must remain in compliance with all of that agreement's covenants. As of December 31, 2021, we are in compliance with the financial covenants of our debt agreements. Debt Maturities The following table summarizes aggregate maturities of the Amended Credit Agreement and 2024 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes for the five years subsequent to December 31, 2021, and thereafter: IN MILLIONS Amended Credit Agreement (a)(b) Senior Notes Total 2022 $ — $ — $ — 2023 100.0 — 100.0 2024 — 600.0 600.0 2025 700.0 — 700.0 2026 — — — Thereafter — 2,134.4 2,134.4 Total debt $ 800.0 $ 2,734.4 $ 3,534.4 (a) - The Company has an option to exercise a one (b) - The Company has an option to exercise two one

Fair Value of Financial Instrum

Fair Value of Financial Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments and Hedging Activities	Fair Value of Financial Instruments and Hedging ActivitiesFair value measurements are based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering assumptions in fair value measurements, a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy) has been established. Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets and liabilities that we have the ability to access. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 inputs are unobservable inputs for the asset or liability that are typically based on an entity's own assumptions, as there is little, if any, related market activity. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular input to the fair value measurement requires judgment and considers factors specific to the asset or liability. The fair value of Cash and cash equivalents, Rent and other receivables, Construction costs payable, Dividends payable and Accounts payable and accrued expenses approximate their carrying value because of the short-term nature of these financial instruments. The carrying value, exclusive of deferred financing costs, for the revolving credit facilities and the floating rate term loans approximate estimated fair value as of December 31, 2021 and 2020, due to the floating rate nature of the interest rates and the stability of our credit ratings. We determine the fair value of our derivative financial instruments using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves, foreign exchange rates and implied volatilities. We determine the fair values of our interest rate swaps using the market standard methodology of netting the discounted future fixed cash receipts or payments and the discounted expected variable cash payments. We base the variable cash payments on an expectation of future interest rates, or forward curves, derived from observable market interest rate curves. We base the fair values of our net investment hedges on the change in the spot rate at the end of the period as compared with the strike price at inception. We incorporate credit valuation adjustments to appropriately reflect nonperformance risk for us and the respective counterparty in the fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we consider the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. We have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy. Although the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties, we assess the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives. The carrying value and fair value of other financial instruments are as follows (in millions): IN MILLIONS December 31, 2021 December 31, 2020 Carrying Value Fair Value Carrying Value Fair Value Debt: Variable Rate Debt: Revolving Credit Facility $ — $ — $ 432.9 $ 432.9 2023 Term Loan Facility 100.0 100.0 100.0 100.0 2025 Term Loan Facility 700.0 700.0 700.0 700.0 Fixed Rate Debt: 2024 Notes - 2.900% (1) 599.4 620.3 599.3 640.7 2027 Notes - 1.450% (1) 566.6 577.3 612.6 619.9 2028 Notes - 1.125% (1) 560.3 565.5 — — 2029 Notes - 3.450% (1) 598.6 653.2 598.4 644.1 2030 Notes - 2.150% (1) 395.8 395.7 395.3 388.6 Derivative Contracts: Cross Currency Swaps Liability (2) 13.5 13.5 52.2 52.2 Interest Rate Swap Liability (2) 2.4 2.4 7.0 7.0 Equity Investments carried at Fair Value: GDS equity investment (3) — — 44.2 44.2 (1) - The fair value of notes are based on quoted market prices for these notes, which is considered Level 1 of the fair value hierarchy. (2) - The fair values of our cross currency and interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash flows and the discounted expected variable cash flows based on an expectation of future interest rates derived from Level 2 observable market interest rate curves. (3) - The fair value is based on quoted market prices for the GDS ADSs, which is considered Level 1 of the fair value hierarchy. We recorded impairment losses of $0.5 million for the year ended December 31, 2021. For the year ended December 31, 2020, we recognized impairment losses of $11.2 million included in Impairment losses and (gain) loss on asset disposals, net in our Consolidated Statements of Operations. We utilize estimates of the fair value of assets to determine impairment losses. These estimates include Level 3 inputs including estimates of replacement costs or residual value, market rents, expected occupancy and estimates of additional capital expenditures, and cashflows from each investment. Hedging Activities When we use derivative instruments, it is generally to reduce our exposure to fluctuations in interest rates and foreign currency exchange rate movements. We have not entered into, and do not plan to enter into, financial instruments for trading or speculative purposes. To manage foreign currency exposure, we have entered into Euro denominated debt and cross-currency swaps to hedge the Company's net investment in its Euro functional currency consolidated subsidiaries and the variability in EUR-USD exchange rate. Accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the designation of the derivative, including whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as foreign currency risk or interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. For derivatives designated as "cash flow" hedges, the change in the fair value of the derivative is initially reported in Other comprehensive income ("OCI") in our Consolidated Statements of Comprehensive Income (Loss) and subsequently reclassified into Gain (loss) when the hedged transaction affects earnings, or the hedging relationship is no longer highly effective. We assess the effectiveness of each hedging relationship whenever financial statements are issued, or earnings are reported and at least every three months. We also use derivatives, such as foreign currency swaps, that are not designated as hedges to manage foreign currency exchange rate risks. The changes in fair values of these derivatives that were not designated or did not qualify as hedging instruments are immediately, recognized in earnings within the line item Foreign currency and derivative gains (losses), net in the Consolidated Statements of Operations. The following table summarizes the Company's derivative positions as of December 31, 2021 and 2020 (in millions): December 31, 2021 December 31, 2020 Maturity Date Notional Amount Hedged Risk Asset Liability Asset Liability Designated derivatives Cross Currency Swaps EUR - USD 3/29/2023 $ 250.0 Net investment hedge $ — $ 6.7 $ — $ 26.0 EUR - USD 3/29/2023 250.0 Net investment hedge — 6.8 — 26.2 Interest Rate Swaps USD Libor 3/29/2023 300.0 Interest rate hedge - Float to fixed — 2.4 — 7.0 Total $ — $ 15.9 $ — $ 59.2 Cross-Currency Swaps The Company has entered into cross-currency swaps whereby the Company pays floating interest rate and receives floating interest rate to hedge the variability of future cash flows attributable to changes in the 1-month USD LIBOR versus EURIBOR rates (a pay-floating, receive-floating interest rate swap). The pay-floating, receive-floating interest rate swap payments are recognized in Interest expense, net in the Consolidated Statements of Operations. The Company has two cross-currency EUR/USD contracts to sell $500.0 million and purchase €450.7 million maturing in March 2023 designated as net investment hedges with a fair value liability of $13.5 million and $52.2 million, respectively, for the periods ended December 31, 2021 and 2020, which are reported in Other liabilities. The Company recognized gains of $4.5 million for the year ended December 31, 2020 on undesignated cross-currency contracts which were recognized in Foreign currency and derivative gains (losses), net in the Consolidated Statements of Operations. Interest Rate Swaps On September 3, 2019, the Company entered into a floating-fixed interest rate swap agreement to convert $300.0 million of variable interest rate debt of the 2023 Term Loan Facility to 1.19% fixed rate debt to hedge the risk of changes in cash flows attributable to USD-LIBOR interest payments, with a fair value liability of $2.4 million and $7.0 million, respectively, for the periods ended December 31, 2021 and 2020 which are reported in Other liabilities. On September 21, 2020, the Company paid down $300.0 million of term loans under the 2023 Term Loan Facility. The $300.0 million floating-fixed interest rate swap remains in place and continues to provide an effective hedge of the risk of changes in cash flows attributable to USD-LIBOR term loans through March 2023. For the years ended December 31, 2021 and 2020, the Company recognized changes in fair value of the interest rate swap in OCI. Net Investment Hedges Exchange rate variations impact our financial results because the financial results of our foreign subsidiaries are translated to U.S. dollars each period, with the effect of exchange rate variations being recorded in OCI as part of the cumulative foreign currency translation adjustment. As a result, changes in the value of our borrowings under the foreign currency denominated revolver under our Revolving Credit Facility, 2027 Notes and synthetically swapped debt will be reported in the same manner as foreign currency translation adjustments, which are recorded in OCI as part of the cumulative foreign currency translation adjustment. The following table presents the effect of our derivative financial instruments on our accompanying consolidated financial statements (in millions): December 31, 2021 December 31, 2020 Derivatives in Cash Flow Hedging Relationships Cross-Currency and Interest Rate Swaps: Amount of gain (loss) recognized in OCI for derivatives $ 43.4 $ (53.0) Amount of gain (loss) reclassified from Accumulated OCI for derivatives (1) $ (3.3) $ (1.7) (1) - Gains and (losses) are recognized in Interest expense, net. During the next 12 months, we estimate that based on current prevailing interest rates that losses of approximately $3.4 million will be reclassified from "Accumulated OCI" to Net income.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Currently, our employees participate in health care plans sponsored by CyrusOne, which primarily provide for medical, dental and vision. We incurred $4.3 million, $3.3 million and $3.9 million of expenses related to these plans for the years ended December 31, 2021, 2020 and 2019, respectively. CyrusOne offers a defined contribution 401(k) retirement savings plan to its employees. CyrusOne's matching contribution to its retirement savings plan was $2.3 million, $2.0 million and $1.9 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Income per Share

Income per Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Income per Share	Income per Share Basic income per share is calculated using the weighted average number of shares of common stock outstanding during the period. In addition, Net income applicable to participating securities and the participating securities are both excluded from the computation of basic income per share. Diluted income per share is calculated using the weighted average number of shares of common stock outstanding during the period, including restricted stock outstanding. If there is Net income during the period, the dilutive impact of common stock equivalents outstanding are also reflected. The following table reflects the computation of basic and diluted Net income per share: IN MILLIONS, except per share amounts Year Ended Year Ended Year Ended For December 31, 2021 2020 2019 Basic Diluted Basic Diluted Basic Diluted Numerator: Net income $ 25.3 $ 25.3 $ 41.4 $ 41.4 $ 41.4 $ 41.4 Less: Restricted stock dividends (0.4) (0.4) (0.5) (0.5) (0.7) (0.7) Net income available to stockholders $ 24.9 $ 24.9 $ 40.9 $ 40.9 $ 40.7 $ 40.7 Denominator: Weighted average common outstanding-basic 123.8 123.8 117.3 117.3 112.1 112.1 Performance-based restricted stock and units 0.1 0.3 0.4 Weighted average shares outstanding-diluted 123.9 117.6 112.5 EPS: Net income per share-basic $ 0.20 $ 0.35 $ 0.36 Effect of dilutive shares: Net income per share-diluted $ 0.20 $ 0.35 $ 0.36

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity During the fourth quarter of 2018, the Company entered into sales agreements pursuant to which the Company may issue and sell from time to time shares of its common stock having an aggregate sales price of up to $750.0 million (the "New 2018 ATM Stock Offering Program"). During the second quarter of 2020, the Company entered into sales agreements pursuant to which the Company may issue and sell from time to time shares of its common stock having an aggregate sales price of up to $750.0 million (the "2020 ATM Stock Offering Program"). The 2020 ATM Stock Offering Program replaced the New 2018 ATM Stock Offering Program. During the second quarter of 2021, the Company entered into sales agreements pursuant to which the Company may issue and sell from time to time shares of its common stock having an aggregate sales price of up to $750.0 million (the "2021 ATM Stock Offering Program" and, together with the New 2018 ATM Stock Offering Program and 2020 ATM Stock Offering Program, the “ATM stock offering program”). The 2021 ATM Stock Offering Program replaced the 2020 ATM Stock Offering Program. During the year ended December 31, 2021, the Company settled forward agreements under its ATM stock offering program totaling 8.4 million common shares at an average price of $70.84 for proceeds of $593.7 million, net of expenses. During the year ended December 31, 2020, the Company settled forward agreements totaling 5.0 million common shares at an average price of $63.61 for proceeds of $315.6 million, net of expenses. As of December 31, 2021, there was approximately $513.4 million under the 2021 ATM Stock Offering Program available for future offerings. At December 31, 2021, the Company had approximately 129.6 million shares of common stock outstanding. Forward Sales During the year ended December 31, 2021, CyrusOne Inc. entered into forward equity sale agreements under its ATM stock offering program with respect to approximately 3.0 million shares. The Company received proceeds of $116.6 million from the sale of 1.6 million of its common shares by the forward purchasers in respect of forward equity sale agreements entered during the year ended December 31, 2021. During the year ended December 31, 2020, CyrusOne Inc. entered into forward equity sale agreements with financial institutions acting as forward purchasers under the New 2018 ATM Stock Offering Program and the 2020 ATM Stock Offering Program, as applicable, with respect to approximately 10.2 million shares of its common stock at a weighted average price of $68.98 per share, net of expenses. The Company received proceeds of $219.1 million from the sale of 3.4 million of its common shares by the forward purchasers in respect of forward equity sale agreements entered during the year ended December 31, 2020. The Company currently expects to fully physically settle the remaining forward equity sale agreements by June 2022 and receive cash proceeds upon one or more settlement dates at the Company’s discretion, prior to the final settlement dates under the forward equity sale agreements, in which case we expect to receive aggregate net cash proceeds at settlement equal to the number of shares specified in such forward equity sale agreements multiplied by the relevant forward price per share. The weighted average forward sale price that we expect to receive upon physical settlement of the agreements will be subject to adjustment for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers' stock borrowing costs and (iii) scheduled dividends during the terms of the agreements. The following table represents a summary of forward sale of equity of our common stock for the year ended December 31, 2021 (in millions): Offering Program Forward Shares Sold/(Settled) Net Proceeds Received Remaining Proceeds Available (1) Total at December 31, 2020 6.8 $ — $ 484.7 Forward adjustments — — (7.6) May 2020 Forward Offering settlement (1.4) 95.3 (95.3) May 2020 Forward Offering settlement (1.3) 95.5 (95.5) May 2021 Forward Offering - Sales 0.3 22.5 June 2021 Forward Offering - Sales 1.6 116.6 June 2021 Forward Offering - Sales 1.1 90.8 September 2020 Forward Offering settlement (1.4) 100.5 (100.5) September 2020 Forward Offering settlement (1.6) 112.5 (112.5) November 2020 Forward Offering settlement (1.1) 73.3 (73.3) June 2021 Forward Offering settlement (1.6) 116.6 (116.6) Total as of December 31, 2021 1.4 $ 593.7 $ 113.3 (1) As of December 31, 2021, the total estimated proceeds, net of adjustments for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers' stock borrowing costs and (iii) scheduled dividends adjustments is $113.3 million subject to further adjustment when the forward offerings are settled as described above. Dividends We have declared cash dividends on common shares and distributions on operating partnership units for the years ended December 31, 2021 and 2020 as presented in the table below: Record date Payment date Cash dividend per share or operating partnership unit March 27, 2020 April 9, 2020 $0.50 June 26, 2020 July 10, 2020 $0.50 September 25, 2020 October 9, 2020 $0.51 January 4, 2021 January 8, 2021 $0.51 March 26, 2021 April 9, 2021 $0.51 June 25, 2021 July 9, 2021 $0.51 September 24, 2021 October 8, 2021 $0.52 January 3, 2022 January 7, 2022 $0.52 As of December 31, 2021 and 2020 we had a dividend payable of $68.1 million and $63.3 million, respectively.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation Stock Plans The board of directors of CyrusOne Inc. adopted the 2012 Long-Term Incentive Plan ("LTIP"), prior to the IPO, which was amended and restated on May 2, 2016 and February 18, 2019. The LTIP is administered by the compensation committee of the board of directors. Awards issuable under the LTIP include common stock, restricted stock, restricted stock units, stock options, LTIP Units (as described below) and other incentive awards. CyrusOne Inc. has reserved a total of 8.9 million shares of CyrusOne Inc. common stock for issuance pursuant to the LTIP, which may be adjusted for changes in capitalization and certain corporate transactions. To the extent that an award, if forfeitable, expires, terminates or lapses, or an award is otherwise settled in cash without the delivery of shares of common stock to the participant, then any unpaid shares subject to the award will be available for future grant or issuance under the LTIP. The payment of dividend equivalents in cash in conjunction with any outstanding awards will not be counted against the shares available for issuance under the LTIP. The related stock compensation expense incurred by CyrusOne Inc. is allocated to the operating partnership. Shares available under the LTIP as of December 31, 2021 were approximately 4.2 million. Shares vest according to each agreement and as long as the employee remains employed with the Company. The Company has granted awards with time-based vesting, performance-based vesting and market-based vesting features. The performance-based vesting metrics granted have varied and are described in each of the grant years below. The company began awarding LTIP Units as grants in February 2021. Pursuant to the LTIP plan, the Company may grant partnership common units in CyrusOne LP called LTIP Units. Vested LTIP Units may be redeemed by the Company in cash or CyrusOne common stock, at the discretion of the Company, on a one-for-one basis with common shares, subject to certain restrictions of the Second Amendment to the Amended and Restated Agreement of Limited Partnership of CyrusOne LP. Time-based LTIP Units receive distributions equally along with common shares. Market-based LTIP Units receive distribution equally along with common shares, however payments are deferred if and until vesting has lapsed, subject to de minimis distributions for federal tax purposes. Restricted stock, restricted stock units and LTIP Units are issued as either time-based where the award vests over the service period of the grant or market-based where the fair value at the time of the award is recognized as expense over the service period. Vesting of market-based awards, if any, is based on achieving certain financial targets, currently based on total stockholder return ("TSR"). The restricted stock units have the right to receive dividend equivalents in cash and holders of restricted stock have the right to receive dividends. The market-based awards accrue dividends equivalents that are payable in cash upon the vesting, if any, of the awards. The market-based metric is total stockholder return (TSR) compared to the MSCI US REIT Index (REIT Index) as defined in the award agreements. The market-based restricted stock/units vest annually based upon the achievement of certain criteria for each of the three-year measurement periods. In each of the first two years vesting is limited to 100% of the target. If at the end of the third year total performance over the three-year period exceeds the REIT Index by 2% or more, up to 200% of these awards may vest. The market-based awards will vest based on the below scales. The scales are linear between each point and awards are interpolated between the points. - If CyrusOne's TSR is less than the return of the REIT Index equals 0% - If CyrusOne's TSR is equal to or greater than the return of the REIT Index equals 100%; up to 200% if CyrusOne's TSR exceeds the return of the REIT Index by 2% - If CyrusOne's TSR exceeds the return of the REIT Index, but is negative, any calculated vesting amount will be reduced by 50% The Company uses the Black-Scholes option-pricing model for time and performance-based options and a Monte Carlo simulation for market-based awards. The fair values of these awards use assumptions such as volatility, risk-free interest rate, and expected term of the awards. The holders of restricted stock have all the rights and privileges of shareholders including the right to vote. The holders of restricted stock units do not have all of the rights and privileges of shareholders and do not have the right to vote. These rights will be acquired upon the settlement of the restricted stock units and the issuance of shares. The time-based restricted stock units have the right to receive dividends that are payable within ten days following the date the dividends are payable to shareholders. Market-based restricted stock units accrue dividends which are paid upon the vesting and settlement of the units. Compensation expense is measured based on the estimated grant-date fair value. Expense for time-based grants is recognized under a straight-line method. For market-based grants, expense is recognized under a graded expense attribution method. For performance-based grants, expense is recognized under a graded expense attribution method if it is probable that the performance targets will be achieved. Any dividends declared with respect to the performance and market-based shares shall be accrued by the Company and distributed on the vesting date provided that the applicable performance goal has been attained. The board of directors of CyrusOne Inc. approved the 2014 Employee Stock Purchase Plan ("ESPP") in February 2014, and amended it effective January 2019. The ESPP provides employees with an opportunity to purchase common stock of the Company at a discount and on a payroll deduction basis. Stock-based compensation expense was as follows: For the periods ended December 31, 2021 2020 2019 2016 Grants $ — $ — $ 1.1 2017 Grants — 0.5 3.1 2018 Grants 0.7 3.9 5.4 2019 Grants and ESPP expense 2.0 5.5 7.1 2020 Grants and ESPP expense 10.9 8.5 — 2021 Grants and ESPP expense 9.0 — — Total $ 22.6 $ 18.4 $ 16.7 2016 Grants On February 1, 2016, the Company issued 641,097 shares of time, performance and market-based awards under the LTIP in the form of restricted stock. The grant date fair value of time and performance-based restricted shares was $36.99. The grant date fair value of market-based restricted shares was $43.66. The Company issued stock options on February 1, 2016. The stock option awards have a contractual life of 10 years from the award date and were granted with an exercise price equal to $36.99. The Company issued 222,461 options with a grant date fair value of $6.99. The performance-based metric is return on assets, which is a non-GAAP financial measure and is defined in the award agreement. The time-based restricted stock awards generally vest pro-rata annually over a three-year period. The performance and market-based restricted stock awards vest annually based upon the achievement of certain criteria for each of the three-year measurement periods. The first two years are capped at 100% of the target with a cumulative true-up to a maximum of 200% possible in year three. Certain employees were also awarded time-based restricted stock that cliff vest at the end of three years. The stock options are time-based and vest annually on a pro-rata basis over three years. In addition, during the year ended December 31, 2016, for various new employee hires, the following grants were made: • 5,894 shares of time-based restricted stock which cliff vest in three years from the date of each grant. • 47,667 shares of time-based restricted stock which vest annually on a pro rata basis over a three-year period from the date of each grant. Total awards granted in 2016 had a grant date fair value of $22.6 million. As of December 31, 2021, there was no unearned compensation related to the awards granted in 2016 as all such awards are fully vested. 2017 Grants On February 13, 2017, the Company issued time and market-based awards under the LTIP in the form of restricted stock units and restricted stock. The Company granted 119,218 time-based restricted stock units that generally vest annually on a pro-rata basis over a three-year period and 18,179 shares of time-based restricted stock that generally vest over a one-year period with a grant date fair value of $48.13, and 129,146 market-based restricted stock units, at target, with a grant date fair value of $63.23. In addition, during the year ended December 31, 2017 the Company granted from time to time a total of 20,852 time-based restricted stock units that vest annually on a pro rata basis over a three-year period. Total awards granted in 2017 had a grant date fair value of $15.9 million. As of December 31, 2021, there was no unearned compensation related to the awards granted in 2017 as all such awards are fully vested. 2018 Grants On February 26, 2018, the Company issued time and market-based awards under the LTIP in the form of restricted stock units and restricted stock. The Company granted 161,797 time-based restricted stock units that generally vest annually on a pro-rata basis over a three-year period and 17,052 shares of time-based restricted stock that generally vest over a one-year period with a grant date fair value of $51.31, and 160,266 market-based restricted stock units, at target, with a grant date fair value of $52.53. In addition, during the year ended December 31, 2018 the Company granted from time to time a total of 40,249 time-based restricted stock units that vest annually on a pro rata basis over a three-year period. Total awards granted in 2018 had a grant date fair value of $20.2 million. As of December 31, 2021, there was no unearned compensation related to the awards granted in 2018 as all such awards are fully vested. 2019 Grants On February 21, 2019, the Company issued time and market-based awards under the LTIP in the form of restricted stock units and restricted stock. The Company granted 175,073 time-based restricted stock units that generally vest annually on a pro-rata basis over a three-year period and 16,681 shares of time-based restricted stock that generally vest over a one-year period with a grant date fair value of $52.46, and 184,145 market-based restricted stock units, at target, with a grant date fair value of $43.67. In addition, during the year ended December 31, 2019, the Company granted from time to time a total of 42,052 time-based restricted stock units that vest annually on a pro rata basis over a three-year period. Total awards granted in 2019 had a grant date fair value of $20.5 million. As of December 31, 2021, unearned compensation representing the unvested portion of the awards granted in 2019 totaled $0.2 million, with a weighted average vesting period of 0.1 years. 2020 Grants On February 25, 2020, the Company issued time and market-based awards under the LTIP in the form of restricted stock units. The Company granted 118,974 time-based restricted stock units that generally vest annually on a pro-rata basis over a three-year period and 57,557 market-based restricted stock units, at target, with grant date fair values of $66.42 and $107.94, respectively. On April 30, 2020, the Company granted 14,973 time-based restricted stock that generally vest over a one-year period with a grant date fair value of $70.15. In addition, during the year ended December 31, 2020, the Company granted from time to time a total of 1,226 time-based restricted stock units that vest annually on a pro rata basis over a three-year period with a grant date fair value of $72.64, 45,241 market-based restricted stock units, at target, with a grant date fair value of $144.79, and 103,260 shares of time-based restricted stock that generally vest over a three-year period with an average grant date fair value of $73.98. Total awards granted in 2020 had a grant date fair value of $30.1 million. As of December 31, 2021, unearned compensation representing the unvested portion of the awards granted in 2020 totaled $2.1 million, with a weighted average vesting period of 0.7 years. 2021 Grants On February 18, 2021, the Company issued time and market-based awards under the LTIP in the form of restricted stock, LTIP Unit and restricted stock units. The Company granted 63,394, 54,244 and 18,387 time-based restricted stock, LTIP Units and restricted stock units, respectively, that generally vest annually on a pro-rata basis over a three-year period with grant date fair values of $69.52, $64.52 and $69.52, respectively. The Company granted 89,113 and 12,285 market-based LTIP Units and restricted stock, respectively, at target, with grant date fair values of $94.95 and $96.43, respectively. On May 18, 2021, the Company granted 10,185 and 5,704 time-based restricted stock and LTIP Units, respectively, that generally vest over a one-year period with a grant date fair value of $73.64. On August 11, 2021, the Company granted a sign-on award of 33,459 shares of time-based restricted stock with vesting of 5/6 on December 29, 2021 and 1/6 on January 29, 2022 with a grant date fair value of $74.67. In addition, during the year ended December 31, 2021, the Company granted from time to time a total of 1,835 time-based restricted stock units that vest annually on a pro rata basis over a three-year period. Total awards granted in 2021 had a grant date fair value of $22.7 million. As of December 31, 2021, unearned compensation representing the unvested portion of the awards granted in 2020 totaled $9.1 million, with a weighted average vesting period of 1.8 years. Restricted Stock Units, Restricted Stock, LTIP Units and Stock Options Activity The following tables summarize the unvested restricted stock units, restricted stock, LTIP Units and stock options activity and the weighted average fair value of these shares at the date of grant for the year ended December 31, 2021 (market-based awards are reflected at the target amount of the grant): Restricted Stock Units ("RSU") 2021 Restricted Stock Units Weighted Outstanding January 1, 484,890 $ 66.66 Granted 20,222 69.92 TSR and other adjustments (a) 186,239 86.98 Exercised (431,074) 62.68 Forfeited (40,131) 119.30 Outstanding December 31, 220,146 $ 82.33 (a) TSR adjustments represent the incremental shares earned for the total stockholder return (TSR) performance metric exceeding target and resulting in 200% payout for the 2018 LTIP Performance Awards. Restricted Stock ("RS") 2021 Restricted Stock Weighted Outstanding January 1, 118,233 $ 74.12 Granted 119,323 74.10 Exercised (150,353) 74.17 Forfeited (9,163) 72.25 Outstanding December 31, 78,040 $ 74.21 LTIP Units 2021 LTIP Units Weighted Average Grant Date Fair Value Outstanding January 1, — $ — Granted 149,061 83.15 Exercised — — Forfeited (53,770) 87.08 Outstanding December 31, 95,291 $ 80.93 Stock Options 2021 Options Weighted Outstanding January 1, 97,801 $ 30.87 Granted — — Exercised (95,196) 31.07 Forfeited — — Outstanding December 31, 2,605 23.58 Exercisable at December 31, 2,605 23.58 Vested and expected to vest 2,605 $ 23.58 The aggregate intrinsic value of options outstanding and options exercisable is based on the Company's closing stock price on the last trading day of the fiscal year for in-the-money options. The aggregate intrinsic value represents the cumulative difference between the fair market value of the underlying common stock and the option exercise prices. The total intrinsic value of options exercised during 2021 was $4.2 million, 2020 was $10.5 million and 2019 was $0.4 million. The aggregate intrinsic value of both options outstanding and options exercisable at December 31, 2021 was $0.2 million. Stock Option Assumptions The following table summarizes the stock option assumptions for the years ended December 31, 2021, 2020 and 2019: Options Outstanding Options Exercisable Assumption Range Exercise Prices Number Weighted Number Weighted Risk-Free Expected Annual Dividend Yield Expected Expected 2019 $23.58 51,985 3.3 51,985 3.3 0.92% 3.4% 6.0 35% $28.42 143,358 5.1 143,358 5.1 1.6% - 1.75% 4.4% 5.5-6.5 32.5% - 37.5% $30.74 12,719 5.6 12,719 5.6 1.6% - 1.75% 4.4% 5.5-6.5 32.5% - 37.5% $36.99 167,024 6.1 167,024 6.1 1.47% - 1.64% 4.1% 5.5-6.5 27.5% - 35.0% 2020 $23.58 16,930 0.9 16,930 0.9 0.92% 3.4% 6.0 35% $28.42 43,317 0.6 43,317 0.6 1.6% - 1.75% 4.4% 5.5-6.5 32.5% - 37.5% $36.99 37,554 0.6 37,554 0.6 1.47% - 1.64% 4.1% 5.5-6.5 27.5% - 35.0% 2021 $23.58 2,605 0.8 2,605 0.8 0.92% 3.4% 6.0 35%

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes CyrusOne Inc. elected to be taxed as a REIT under the Code, commencing with its taxable year ended December 31, 2013. To remain qualified as a REIT, the Company is required to distribute at least 90% of its taxable income to its stockholders and meet various other requirements imposed by the Code relating to such matters as operating results, asset holdings, distribution levels and diversity of stock ownership. Provided the Company continues to qualify for taxation as a REIT, the Company is generally not subject to corporate level federal income tax on the earnings distributed currently to its stockholders. It is the Company's policy and intent, subject to change, to distribute 100% of its taxable income and therefore no provision is required in the accompanying financial statements for federal income taxes with regards to activities of CyrusOne Inc. and its subsidiary pass-through entities. CyrusOne Inc. and certain of its subsidiaries are subject to state and local income taxes, franchise taxes, and gross receipts taxes. The Company has elected to treat certain of its subsidiaries as taxable REIT subsidiaries ("TRSs"). The Company's TRSs are subject to U.S. federal, state and local corporate income taxes. The Company's foreign subsidiaries are subject to corporate income taxes in the jurisdictions in which they operate. Income tax (benefit) expense for the years ended December 31, 2021, 2020 and 2019 as reported in the accompanying Consolidated Statements of Operations was comprised of the following: Year Ended December 31, IN MILLIONS 2021 2020 2019 Current Federal $ 1.9 $ 1.5 $ 1.7 State 2.2 2.0 1.9 Foreign 0.5 5.0 0.2 Total current expense $ 4.6 $ 8.5 $ 3.8 Deferred: Federal $ — $ — $ — State — — — Foreign (9.5) (12.1) (7.5) Total deferred benefit (9.5) (12.1) (7.5) Total income tax benefit $ (4.9) $ (3.6) $ (3.7) An income tax expense reconciliation between the U.S. statutory tax rate and the effective tax rate is as follows: Year Ended December 31, IN MILLIONS 2021 2020 2019 Income tax at U.S. federal statutory income tax rate $ 4.3 $ 3.9 $ 7.9 State and local taxes, net of federal income tax benefit 2.2 1.6 1.7 Impact of REIT status (16.9) (18.2) (13.7) Permanent differences — 0.1 (0.7) Foreign tax rate and currency differences (1.6) (2.7) (1.0) Anti-hybrid disallowances 1.9 2.4 1.6 Deferred tax true ups and other 4.6 1.0 — Unrecognized tax benefits 0.5 5.0 — Valuation allowance 0.1 3.3 0.5 Income tax benefit $ (4.9) $ (3.6) $ (3.7) The effective tax rate on income from continuing operations differs from tax at the statutory rate primarily due to the Company's status as a REIT and taxation of its foreign subsidiaries. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. The components of the Company’s deferred tax assets and liabilities are as follows: Year Ended December 31, IN MILLIONS 2021 2020 Deferred tax assets Net operating loss carryforwards $ 18.9 $ 19.7 Accounts receivable/payable and other 8.7 9.1 Disallowed interest and other expenses 4.9 3.4 Finance leases 1.9 1.6 Total gross deferred tax assets $ 34.4 $ 33.8 Valuation allowance (12.6) (12.2) Total gross deferred tax assets, net $ 21.8 $ 21.6 Deferred tax liabilities Deferred rent and other $ (8.6) $ (1.9) Fixed assets (50.1) (67.5) Intangibles (2.9) (5.2) Total gross deferred tax liabilities $ (61.6) $ (74.6) Total net deferred tax liabilities $ (39.8) $ (53.0) As of December 31, 2021, the Company’s deferred tax assets were primarily attributable to foreign NOL carryforwards that generally do not expire. A valuation allowance will be recorded to reduce deferred tax assets to amounts that are more likely than not to be realized. As of each reporting date, the Company’s management considers new evidence, both positive and negative, that could impact management’s view with regard to future realization of deferred tax assets. The Company has recorded a valuation allowance of $12.6 million as of December 31, 2021. The Company and its subsidiaries file tax returns in the U.S. federal jurisdiction, various state and local jurisdictions, and certain foreign jurisdictions. With few exceptions, the Company is no longer subject to examination of its U.S. federal, state and local tax returns for years prior to 2018. A reconciliation of the Company’s beginning and ending liability for unrecognized tax benefits is as follows: IN MILLIONS 2021 2020 2019 Balance at January 1 $ 5.0 $ — $ — Additions related to acquisitions — — — Additions for tax positions for the current year — 5.0 — Additions for tax positions of prior years — — — Reductions for tax positions of prior years — — — Settlements — — — Balance at December 31 $ 5.0 $ 5.0 $ —

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases The Company leases certain data center facilities and equipment from third parties. Certain of these leases provide for renewal options with fixed rent escalations beyond the initial lease term. Standby Letters of Credit As of December 31, 2021, the Company had outstanding letters of credit of $8.4 million as security for obligations under the terms of its lessee agreements. Performance Guarantees Customer contracts generally require specified levels of performance related to uninterrupted service and cooling temperatures and delivery of data center spaces at specified dates. If these performance standards are not met, the Company could be obligated to issue billing credits to the customer. Management assesses the probability that a performance standard will not be achieved. We recognized contingent losses of $0.9 million and $3.5 million for performance guarantees for the years ended December 31, 2021 and December 31, 2020, respectively. No contingent losses were incurred for performance guarantees in 2019. Purchase Commitments The Company has entered into non-cancellable contracted commitments for construction of data center facilities and acquisition of equipment. As of December 31, 2021, these commitments were approximately $287.2 million and are expected to be incurred over the next one one Indemnifications During the normal course of business, we make certain indemnities, commitments and guarantees under which we may be required to make payments in relation to certain transactions. These include (i) intellectual property indemnities to customers in connection with the use, sale and/or license of products and services, (ii) indemnities to vendors and service providers pertaining to claims based on our negligence or willful misconduct and (iii) indemnities involving the representations and warranties in certain contracts. In addition, we have made contractual commitments to several employees providing for payments upon the occurrence of certain prescribed events. The majority of these indemnities, commitments and guarantees do not provide for any limitation on the maximum potential for future payments that we could be obligated to make. Management assesses the probability that these performance standards, credits, claims or indemnities have been incurred and liabilities or asset reserves are established for loss contingencies when the losses associated are deemed to be probable and the loss can be reasonably estimated. Based on information currently available, the Company believes that the outcome of such matters will not, individually or in the aggregate, have a material effect on its consolidated financial statements. Contingencies CyrusOne is involved in legal, tax and regulatory proceedings arising from the conduct of its business activities. Liabilities are established for loss contingencies when losses associated with such claims are deemed to be probable, and the loss can be reasonably estimated. Based on information currently available and consultation with legal counsel, we believe that the outcome of all claims will not, individually or in the aggregate, have a material effect on our financial statements.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventOn January 14, 2022, CyrusOne LLC and CyrusOne LP, two wholly-owned subsidiaries of the Company, entered into an Asset Purchase Agreement with a third party (“Purchaser”), pursuant to which Purchaser has agreed to acquire substantially all of the assets exclusively related to our four facilities in the Houston area for a purchase price of $670.0 million in cash. The asset purchase is anticipated to close in the first quarter of 2022.

Schedule II. Valuation and Qual

Schedule II. Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II. Valuation and Qualifying Accounts	Schedule II. Valuation and Qualifying Accounts Beginning Charge (Deductions)/ End (dollars in millions) of Period to Expenses Additions of Period Allowance for Doubtful Accounts 2021 $ 3.5 $ (1.5) $ (0.6) $ 1.4 2020 1.8 1.7 — 3.5 2019 1.7 1.7 (1.6) 1.8 Deferred Tax Valuation Allowance 2021 $ 12.2 $ 0.4 $ — $ 12.6 2020 7.6 4.6 — 12.2 2019 6.9 0.7 — 7.6

Schedule III. Real Estate Prope

Schedule III. Real Estate Properties and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III. Real Estate Properties and Accumulated Depreciation	Schedule III. Real Estate Properties and Accumulated Depreciation CyrusOne Inc. As of December 31, 2021 (dollars in millions) Initial Costs Cost Capitalized Subsequent to Gross Carrying Amount Description Land Building and Equipment Land Building and Equipment Land Building and Equipment Accumulated Acquisition Amsterdam I $ 9.0 $ — $ — $ 0.5 $ 12.3 $ 38.4 $ 9.5 $ 12.3 $ 38.4 $ 6.2 2020 Austin II 2.0 — — — 23.5 14.8 2.0 23.5 14.8 24.6 2011 Austin III 3.3 — — — 12.7 72.8 3.3 12.7 72.8 29.0 2015 Chicago - Aurora I 2.4 26.0 97.3 — 6.4 41.1 2.4 32.4 138.4 88.7 2016 Chicago - Aurora II 2.6 — — — 23.4 74.7 2.6 23.4 74.7 30.1 2016 Chicago - Aurora Tower — — — — 6.4 1.3 — 6.4 1.3 1.4 2018 Chicago - Lombard 0.7 3.2 — — 1.6 8.4 0.7 4.8 8.4 9.6 2008 Cincinnati - 7th Street 0.9 42.2 — — 72.0 38.7 0.9 114.2 38.7 112.8 1999 Cincinnati - Blue Ash* — 2.6 — — (1.9) 0.2 — 0.7 0.2 0.8 2009 Cincinnati - Hamilton — 9.5 — — 34.2 8.2 — 43.7 8.2 42.7 2007 Cincinnati - Mason — — — — 20.3 2.0 — 20.3 2.0 17.5 2004 Cincinnati - North Cincinnati 0.9 12.3 — — 65.5 25.9 0.9 77.8 25.9 59.9 2008 Council Bluffs I 1.4 — — — 24.0 30.3 1.4 24.0 30.3 4.1 2020 Dallas - Allen 6.5 — — — 16.2 41.4 6.5 16.2 41.4 12.4 2017 Dallas - Carrollton 16.1 — — — 67.2 361.6 16.1 67.2 361.6 198.0 2012 Dallas - Lewisville — 46.2 2.2 — 12.0 40.3 — 58.2 42.5 81.5 2010 Dublin I 4.7 — — — 49.3 67.5 4.7 49.3 67.5 4.1 2021 Florence 2.2 7.7 — — 36.2 11.1 2.2 43.9 11.1 41.3 2005 Frankfurt I 4.1 35.2 120.5 — 1.2 4.8 4.1 36.4 125.3 34.8 2018 Frankfurt II 7.0 — 54.1 — 138.5 47.0 7.0 138.5 101.1 42.3 2018 Frankfurt III 22.3 — — — 89.3 151.0 22.3 89.3 151.0 15.8 2020 Houston - Galleria — 56.0 2.0 — 15.3 23.7 — 71.3 25.7 71.0 2010 Houston - Houston West I 1.4 21.4 0.1 — 63.7 55.0 1.4 85.1 55.1 105.8 2010 Houston - Houston West II 2.0 — — 0.7 22.8 54.2 2.7 22.8 54.2 48.9 2013 Houston - Houston West III 7.1 — — 0.1 18.2 33.1 7.2 18.2 33.1 20.5 2013 London - Great Bridgewater — 28.5 — — (28.5) 1.7 — — 1.7 1.3 2011 London I — 34.2 37.4 — 16.8 19.4 — 51.0 56.8 20.6 2018 London II — 26.9 79.3 — 25.1 40.7 — 52.0 120.0 51.0 2018 London III — — — — 16.8 58.7 — 16.8 58.7 6.1 2020 London IV — — — — 76.5 — — 76.5 — — 2021 London V — — — — 52.8 — — 52.8 — — 2021 Northern Virginia - Sterling I 1.6 — — 0.1 20.2 62.2 1.7 20.2 62.2 42.0 2013 Northern Virginia - Sterling II 3.4 — — — 28.8 111.8 3.4 28.8 111.8 52.9 2013 Northern Virginia - Sterling III 1.9 — — — 22.3 60.9 1.9 22.3 60.9 30.3 2017 Northern Virginia - Sterling IV 4.6 9.6 0.1 — 10.5 76.4 4.6 20.1 76.5 34.4 2016 Northern Virginia - Sterling V 14.5 — — — 93.9 329.2 14.5 93.9 329.2 123.1 2016 Northern Virginia - Sterling VI 9.7 — — — 68.9 220.2 9.7 68.9 220.2 62.0 2018 Northern Virginia - Sterling VII 5.9 — — — — 0.1 5.9 — 0.1 — 2020 Northern Virginia - Sterling VIII 9.1 — — — 25.3 74.0 9.1 25.3 74.0 13.4 2018 Northern Virginia - Sterling IX 16.1 — — — 74.0 125.6 16.1 74.0 125.6 10.3 2020 Norwalk I* — 18.3 25.3 — (14.0) (2.1) — 4.3 23.2 7.2 2015 Paris I — — — — 1.8 55.1 — 1.8 55.1 2.4 2021 Phoenix - Chandler I 2.5 — — — 61.9 72.6 2.5 61.9 72.6 70.1 2011 Phoenix - Chandler II 2.1 — — — 16.2 39.8 2.1 16.2 39.8 31.9 2014 Phoenix - Chandler III 2.0 0.9 2.5 — 10.5 63.4 2.0 11.4 65.9 26.8 2016 Phoenix - Chandler IV 2.0 — — — 18.4 45.5 2.0 18.4 45.5 21.0 2017 Phoenix - Chandler V 1.8 — — — 23.6 120.5 1.8 23.6 120.5 26.4 2017 Phoenix - Chandler VI 2.3 — — 0.1 25.1 102.9 2.4 25.1 102.9 40.6 2016 Phoenix - Chandler VII 4.2 — — — 20.3 70.2 4.2 20.3 70.2 2.2 2016 Raleigh-Durham I 2.1 73.5 71.3 — 10.8 31.0 2.1 84.3 102.3 62.8 2017 San Antonio I 4.6 3.0 — — 28.7 38.8 4.6 31.7 38.8 44.6 2011 San Antonio II 2.3 — — 0.3 30.3 61.4 2.6 30.3 61.4 37.2 2013 (dollars in millions) Initial Costs Cost Capitalized Subsequent to Gross Carrying Amount Description Land Building and Equipment Land Building and Equipment Land Building and Equipment Accumulated Acquisition San Antonio III $ 2.3 $ — $ — $ — $ 40.2 $ 100.1 $ 2.3 $ 40.2 $ 100.1 $ 50.2 2017 San Antonio IV 2.1 — — — 60.6 51.3 2.1 60.6 51.3 29.5 2017 San Antonio V 2.9 — — — 47.9 106.4 2.9 47.9 106.4 13.1 2020 Santa Clara II — 2.7 — — — 0.2 — 2.7 0.2 2.7 2019 Somerset I 12.1 124.6 83.3 — 32.7 78.0 12.1 157.3 161.3 85.3 2017 Stamford - Omega* — 3.2 0.6 — (3.2) (0.6) — — — — 2015 Stamford - Riverbend* — 4.3 13.2 — (3.4) (4.2) — 0.9 9.0 8.8 2015 Totowa - Commerce — 4.1 0.8 — (3.5) 1.0 — 0.6 1.8 1.7 2015 Totowa - Madison — 28.3 45.6 — (22.2) 15.6 — 6.1 61.2 46.3 2015 Wappingers Falls I — 9.9 13.3 — (6.7) 16.1 — 3.2 29.4 22.1 2015 $ 208.7 $ 634.3 $ 648.9 $ 1.8 $ 1,709.7 $ 3,491.4 $ 210.5 $ 2,344.0 $ 4,140.3 $ 2,184.1 Land held for future development $ 301.3 $ — $ — $ — $ — $ — $ 301.3 $ — $ — $ — The aggregate cost of the total properties for federal income tax purposes was $8,740.2 million at December 31, 2021. In addition, Construction in progress was $765.9 million as we continue to build data center facilities. * Reductions in Cost Capitalized Subsequent to Acquisition due to impairment losses recorded for the respective facility. Historical Cost and Accumulated Depreciation and Amortization The following table reconciles the historical cost and accumulated depreciation for the years ended December 31, 2021, 2020 and 2019. Years Ended December 31, (amounts in millions) 2021 2020 2019 Property Balance—beginning of period $ 7,033.4 $ 6,089.5 $ 5,347.5 Disposals (25.5) (6.7) (15.8) Impairments (0.5) (10.8) (0.7) Impact of adoption of ASU 2016-02 — — (97.8) Additions (acquisitions and improvements) 844.2 866.0 850.6 Foreign exchange (loss) gain (89.6) 95.4 5.7 Balance, end of period (1) $ 7,762.0 $ 7,033.4 $ 6,089.5 Accumulated Depreciation Balance—beginning of period $ 1,767.9 $ 1,379.2 $ 1,054.5 Disposals (19.4) (5.9) (14.0) Impact of adoption of ASU 2016-02 — — (19.3) Additions (depreciation and amortization expense) 443.1 401.0 357.0 Foreign exchange (loss) gain (7.5) (6.4) 1.0 Balance, end of period $ 2,184.1 $ 1,767.9 $ 1,379.2 (1) - Includes construction-in-progress of $765.9 million, $982.2 million and $946.3 million for the years ended December 31, 2021, 2020 and 2019, respectively that is not included in amounts reflected above in Schedule III.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying financial statements are prepared on a consolidated basis. In addition, the accompanying financial statements have been prepared in accordance with generally accepted accounting principles in the U.S. (GAAP) and include the accounts of the Company, as well as all wholly-owned subsidiaries and any consolidated variable interest entities. All intercompany transactions and balances have been eliminated in consolidation.
Risks and Uncertainties	Risks and Uncertainties We continue to monitor the global outbreak of the novel coronavirus (COVID-19) and to take steps to mitigate the potential risks to us posed by the pandemic. We provide a critical service to our customers and are considered an essential business by most governments. While the impact of the pandemic on our business has not been significant to date, we are unable to predict its future impact on our business, financial condition, results of operations, cash flows and ability to pay dividends as well as the market price of our common stock.
Investments in Real Estate	Investment in Real Estate Acquisition of Properties Investment in real estate consists of land, buildings, improvements and integral equipment utilized in our data center operations. We expect most acquisitions to be an acquisition of assets rather than a business combination as our typical acquisitions consist of properties whereby substantially all the fair value of gross assets acquired is concentrated in a single asset set (land, building and in-place leases), which are treated as asset acquisitions. See Business Combinations and Asset Acquisitions herein.
Business Combinations and Asset Acquisitions	Business Combinations and Asset Acquisitions We evaluate whether an acquisition is a business combination or an asset acquisition by determining whether the set of assets is a business. Asset Acquisitions When substantially all of the fair value of gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the transaction is accounted for as an asset acquisition. Asset acquisitions are recorded at the cumulative acquisition costs and allocated to the assets acquired and liabilities assumed on a relative fair value basis. The Company allocates the purchase price of real estate to identifiable tangible assets such as land, building, land improvements and tenant improvements acquired based on their fair value. In estimating the fair value of each component, management considers appraisals, replacement cost, its own analysis of recently acquired and existing comparable properties, market rental data and other related information. Transaction costs associated with asset acquisitions are capitalized. Business Combinations When substantially all of the fair value is not concentrated in a group of similar identifiable assets, the set of assets will generally be considered a business and the Company applies acquisition accounting for business combinations, where all tangible and identifiable intangible assets acquired and all liabilities assumed are recorded at fair value. Any excess purchase price is recorded as goodwill. Transaction costs associated with business combinations are expensed as incurred. The following discussion applies to our initial determination of fair value and the resulting subsequent accounting which is generally applicable to both asset acquisitions and business combinations. The fair value of any tangible real estate assets acquired is determined by valuing the building as if it were vacant, and the fair value is then allocated to land, buildings, equipment and improvements based on available information including replacement cost, appraisal or using net operating income capitalization rates, discounted cash flow analysis or similar fair value models. We determine in-place lease values based on our evaluation of the specific characteristics of each tenant’s lease agreement and by applying a fair value model. The estimates of fair value of in-place leases include an estimate of carrying costs during the expected lease up periods considering current market conditions. In estimating fair value of in-place leases, we consider items such as real estate taxes, insurance, leasing commissions, tenant improvements and other operating expenses to execute similar leases as well as projected rental revenue and carrying costs during the expected lease up period. We amortize the value of in-place leases acquired to expense over the approximate weighted average remaining term of the leases, adjusted for projected tenant turnover, on a composite basis. We determine the value of above-market and below-market in-place leases for acquired properties based on the present value (using an interest rate that reflects the risks associated with the leases acquired) of the difference between (1) the contractual amounts to be paid pursuant to the in-place leases and (2) estimates of current market lease rates for the corresponding in-place leases, measured over a period equal to (i) the remaining non-cancellable lease term for above-market leases, or (ii) the remaining non-cancellable lease term plus any renewal options that we consider are reasonably certain that a lessee will execute such renewal option when a lease commences. We record the fair value of above-market and below-market leases as intangible assets or liabilities, and amortize them as an adjustment to revenue over the lease term. We determine the fair value of assumed debt by calculating the net present value of the scheduled debt service payments using current market-based terms for interest rates for debt with similar terms that management believes we could obtain on similar structures and maturities. Any difference between the fair value and stated value of the assumed debt is recorded as a discount or premium and amortized over the remaining term of the loan. In a business combination, we retain the previous lease classification unless there is a lease modification and that modification is not accounted for as a separate new lease. We elected to apply the short-term lease measurement and recognition exemption available under the new accounting standard for leases (discussed below in Note 4, Recently Issued Accounting Standards) to leases that have a remaining lease term of 12 months or less at the acquisition date, and accordingly, do not recognize an intangible asset if the terms of an operating lease are favorable relative to market terms, or a liability if the terms are unfavorable relative to market terms. Leasehold improvements are amortized over the shorter of the useful life of the assets and the remaining lease term at the date of acquisition.
Capitalization of Costs	Capitalization of Costs We capitalize costs directly related to the development, pre-development or improvement of our investment in real estate, referred to as capital projects and other activities included within this paragraph. Costs associated with our capital projects are capitalized as incurred. If the project is abandoned, these costs are expensed during the period in which the project is abandoned. Costs considered for capitalization include, but are not limited to, construction costs, interest, real estate taxes, insurance and utilities, if appropriate. We capitalize indirect costs such as personnel, office and administrative expenses that are directly related to our development projects based on an estimate of the time spent on the construction and development activities. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. We determine when the capitalization period begins and ends through communication with project and other managers responsible for the tracking and oversight of individual projects. In the event that the activities to ready the asset for its intended use are suspended, the capitalization period will cease until such activities are resumed. In addition, we capitalize incremental initial direct costs incurred for successful origination of new leases which include internal and external leasing commissions. Interest expense is capitalized based on actual qualifying capital expenditures from the period when development commences until the asset is ready for its intended use, at the weighted average borrowing rate during the period. These costs are included in Investment in real estate and depreciated over the estimated useful life of the related assets. Costs incurred for maintaining and repairing our properties, which do not extend their useful lives, are expensed as incurred.
Impairment Losses	Impairment Losses When events or circumstances indicate that the carrying amount of a real estate investment may not be recoverable, we review the carrying value of the asset. When such impairment indicators exist, we review an estimate of the undiscounted future cash flows expected to result from the use of the real estate investment and proceeds from its eventual disposition and compare such amount to the carrying value of the real estate investment. If our undiscounted cash flows indicate that we are unable to recover the carrying value of the real estate investment, an impairment loss is recognized. An impairment loss is measured as the amount by which the real estate investment's carrying value exceeds its estimated fair value. We recorded an impairment loss of $0.5 million for equipment held for use in inventory based on the book value of the abandoned equipment for the year ended December 31, 2021. We recognized an impairment loss of $11.2 million for the year ended December 31, 2020 which included an $8.8 million impairment loss based on our estimate of the decrease in the fair value of the equipment held for use in inventory at our U.S. data centers and a $2.4 million impairment loss based on the estimated fair value for our investment in land held in Atlanta for future development as the Company sold this land to a third-party in February 2021. We recognized an impairment loss of $0.7 million for the year ended December 31, 2019, primarily due to an impairment loss on our South Bend - Monroe facility, which was being actively marketed for sale. These fair values were based on unobservable inputs and the determination of fair value of real estate assets to be held for use is derived using the discounted cash flow method and involves a number of management assumptions relating to future economic events that could materially affect the determination of the ultimate fair value. Such assumptions are Level 3 inputs and include, but are not limited to, projected vacancy rates, rental rates, property operating expenses and required capital expenditures. These factors require management's judgment of factors such as market knowledge, historical experience, lease terms, tenant financial strength, economy, demographics, environment, property location, age, physical condition and expected return requirements, among other things. The aforementioned factors are taken as a whole by management in the determination of fair value. See Fair Value Measurements below for further information on fair value.
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents and Restricted Cash Cash and cash equivalents include all non-restricted cash held in financial institutions and other non-restricted highly liquid short-term investments with original maturities of three months or less. Restricted cash includes cash equivalents restricted by contract or regulation, including letters of credit.
Equity Investments	Equity Investments We hold investments in various joint ventures where the Company evaluates its ability to influence the operating or financial decisions of the investee in applying the appropriate method of accounting for such investments. Influence tends to be more effective as the investor's percent of ownership in the voting rights of the investee increases. Our equity investments represent less than 20% of the voting rights of the investees and we do not exercise influence over the investee's operating and financial decisions. Accordingly, we do not account for our equity investments using the equity method of accounting. For further information about our equity investments, see Note 8, Equity Investments. During January 2021, we disposed of our remaining investment in GDS Holdings Limited ("GDS"). Prior to its disposal, it was classified as available for sale and carried at fair value. Changes in the fair value were reported as a component of net income in Gain on marketable equity investment.
Goodwill	Goodwill We evaluate goodwill for possible impairment at least annually or upon the occurrence of events or circumstances that indicate that they would more likely than not reduce the fair value of a reporting unit below its carrying amount. For our annual impairment evaluation, we have the option of performing a qualitative or quantitative goodwill impairment analysis. A qualitative analysis, step zero, analyzes the macro-economic environment in which we operate for any significant changes such as deterioration in the market that the Company operates or overall financial performance such as declining cash flows. Also, entity specific changes are analyzed such as change in management, strategy or composition of reporting unit. This assessment of qualitative factors serves as a basis for determining whether it is necessary to perform the step one test. A quantitative analysis, step one, requires the Company to estimate the fair value of the reporting unit and compare the fair value to the carrying value to identify whether the value of the recorded goodwill is impaired. Changes in certain assumptions could have a significant impact on the impairment test for goodwill under step one. The most critical assumptions are projected future growth rates, operating margins, capital expenditures, tax rates, terminal values and discount rates. These assumptions are subject to change as our long-term plans and strategies are updated each year. During the fourth quarters of 2021, 2020 and 2019, we performed a qualitative evaluation and determined that the fair value of the reporting unit is substantially in excess of the carrying amount and therefore determined that further quantitative impairment testing was not necessary.
Rent and Other Receivables	Rent and Other Receivables Receivables consist principally of rent receivables including straight-line rent receivables. A general reserve may be recognized as an allowance for doubtful accounts when collectibility is not probable, after applying the overall collectibility constraint under the new accounting standard for leases. Straight-line rent receivable, net was $174.1 million and $172.6 million at December 31, 2021 and 2020, respectively. The allowance for doubtful accounts is estimated based upon historic patterns of credit losses for aged receivables as well as specific provisions for certain identifiable, potentially uncollectible balances.
Deferred Revenue and Prepaid Rents	Deferred Revenue and Prepaid Rents Deferred revenue is recorded when a customer makes a contractual payment in excess of revenues recognized in accordance with GAAP. Prepaid rent liability is recorded when a customer makes an advance payment or they are contractually obligated to pay any amounts in advance of the associated lease or service period.
Revenue Recognition	Revenue Recognition Our revenue consists of lease revenue and revenue from contracts with customers. Lease Revenue: Our leasing revenue primarily consists of colocation rent, metered power reimbursements and interconnection revenue and is accounted for under Accounting Standards Codification ("ASC") 842, Leases ("ASC 842"). We generally are not entitled to reimbursements for rental expenses including real estate taxes, insurance or other common area operating expenses. a. Colocation Rent Revenue Colocation rent revenues, including interconnection revenue, are fixed minimum lease payments generally billed monthly in advance based on the contracted power or leased space. Some contracts may provide initial free rent periods and rents that escalate over the term of the contract. If rents escalate without the lessee gaining access to or control over additional leased power or space at the beginning of the lease term, the rental payments are recognized as revenue on a straight-line basis over the term of the lease. If rents escalate because the lessee gains access to and control over additional power and or leased space, revenue is recognized in proportion to the additional power or space in the periods that the lessee has control over the use of the additional power or space. The excess of revenue recognized over amounts contractually due is recognized as a straight-line receivable, which is included in Rent and other receivables in our Consolidated Balance Sheet. Some of our leases are structured on a gross basis in which the customer pays a fixed amount for colocation space and power. The revenue for these types of leases is recorded in colocation rent revenue. b. Metered Power Reimbursements Revenue Some of our leases provide that the customer is separately billed for power based upon actual or estimated metered usage generally at rates then in effect. Metered power reimbursement revenue is variable lease payments generally billed one month in arrears, and an estimate of this revenue is accrued in the month that the associated power is provided and recorded in metered power reimbursements revenue. Revenue from Contracts with Customers Revenue from our managed services, equipment sales, installations and other services are recognized under ASC 606, Revenue from Contracts with Customers ("ASC 606"). Equipment sold by us generally consists of servers, switches, networking equipment, cable infrastructure and cabinets. Revenue is recognized at a point-in-time when control of the equipment transfers to the customer from the Company, which generally occurs upon delivery to the customer. Managed services include providing a full-service managed data center, monitoring customer computer equipment, managing backups and storage, utilization reporting and other related ancillary information technology services. Management service contracts generally range from one Installation services include mounting, wiring, and testing of customer owned equipment. The installation period is typically short term in duration, and accordingly, revenue from the installation of customer equipment is recognized at a point-in-time once the installation is complete and the performance obligation is satisfied. Other services generally include installation of customer equipment, performing customer system re-boots, server cabinet and cage management, power monitoring, shipping and receiving, resolving technical issues, and other services requested by the customer. Other service revenue is measured based on the consideration specified in the contract and recognized over time as we satisfy the performance obligation. We adopted the practical expedient in ASC 606 that allows the Company to not disclose information about remaining performance obligations that have original expected durations of one year or less, the amount of the transaction price allocated to the remaining performance obligations and when we expect to recognize that amount as revenue for the year. We have also adopted the “as invoiced” practical expedient, whereby the Company recognizes revenue in the amount that directly corresponds to the amount of value transferred to the customer. Contract assets were $0.5 million and $0.4 million as of December 31, 2021 and December 31, 2020, respectively. Contract liabilities were not material as of both December 31, 2021 and December 31, 2020.
Depreciation and Amortization Expense	Depreciation and Amortization Expense Depreciation expense is recognized over the estimated useful lives of real estate applying the straight-line method. The useful life of leased real estate and leasehold improvements is the lesser of the economic useful life of the asset or the term of the lease, including optional renewal periods if renewal is reasonably certain.
Foreign Currency Translation and Transactions	Foreign Currency Translation and TransactionsThe financial position of foreign subsidiaries is translated at the exchange rates in effect at the end of the period, while revenues and expenses are translated at average exchange rates during the period. Gains or losses from translation of foreign operations where the local currency is the functional currency are included as components of Other comprehensive income (loss). Gains or losses from foreign currency transactions are included in determining net income.
Stock-Based Compensation	Stock-Based Compensation We have a stock-based incentive award plan for our employees and directors. Stock-based compensation expense associated with these awards is recognized in General and administrative expenses, Property operating expenses and Sales and marketing expenses in our Consolidated Statements of Operations. We measure stock-based compensation at the estimated fair value on the grant date and recognize the amortization of stock-based compensation expense over the requisite service period. Fair value is determined based on assumptions related to stock volatility, risk-free rate of return and estimates of market and company performance.
Fair Value Measurements	Fair Value Measurements Fair value measurements are utilized in accounting for business combinations, asset acquisitions, testing of goodwill and other long-lived assets for impairment, recording unrealized gain on available-for-sale securities, derivatives and related disclosures. Fair value of financial and non-financial assets and liabilities is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The three-tier hierarchy that prioritizes certain inputs used in the methodologies of measuring fair value for asset and liabilities, is as follows: Level 1—Observable inputs for identical instruments such as quoted market prices; Level 2—Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs); and Level 3—Unobservable inputs that reflect our determination of assumptions that market participants would use in pricing the asset or liability. These inputs are developed based on the best information available, including our own data.
Derivative Instruments	Derivative Instruments We primarily hedge our foreign currency risk by borrowing in the currencies in which we invest. We may use derivative financial instruments, such as cross-currency swaps to manage foreign currency exchange rate risk related to both our foreign investments and the related earnings. In addition, we occasionally use interest rate swap contracts to manage interest rate risk and limit the impact of future interest rate changes on earnings and cash flows, primarily related to variable-rate debt. Derivative instruments are measured at fair value and recorded in Other assets and Other liabilities, depending on our rights or obligations under the applicable derivative contract. Derivatives that are not designated as hedges must be adjusted to fair value through earnings. Designated Derivatives. We may choose to designate our derivative financial instruments, generally cross-currency swaps as net investment hedges in foreign operations. At inception of the transaction, we designate the derivative financial instrument as a hedge of a specific underlying exposure, including the risk management objective and the strategy for undertaking the hedge transaction. We formally assess both at inception and at least quarterly thereafter, the effectiveness of our hedging transactions. Due to the high degree of effectiveness between the hedging instruments and the underlying exposures hedged, fluctuations in the value of the derivative financial instruments will generally be offset by changes in the cash flows or fair values of the underlying exposures being hedged. In addition to the net investment hedges described above, we may issue debt in a currency that is not the same functional currency of the borrowing entity to hedge our international investments. We designate the debt and related accrued interest as a net investment hedge to offset the translation and economic exposures related to our international investments. If the debt and related accrued interest exceeds the designated amount of our international investment, the foreign currency remeasurement on the unhedged portion of the debt during the period is recognized in Foreign currency and derivative gains (losses), net. For cash flow hedges, such as interest rate swaps, we report the effective portion of the gain or loss as a component of Other comprehensive income (loss) and reclassify it to the applicable line item in the Consolidated Statements of Operations, generally Interest expense, net over the corresponding period of the underlying hedged item. The ineffective portion of a derivative financial instrument’s change in fair value is recognized in earnings, generally Interest expense, net at the time the ineffectiveness occurred. To the extent the hedged debt related to our interest rate swaps and forwards is paid off early, we write off the remaining balance in Other comprehensive income (loss) and recognize the amount in Interest expense, net in the Consolidated Statements of Operations. Undesignated Derivatives . Derivative instruments, such as cross-currency swaps, for which hedge accounting is not applied are recorded at fair value in Other assets and Other liabilities and gains and losses resulting from changes in the fair value are reported in Foreign currency and derivative gains (losses), net in the Consolidated Statements of Operations. In addition, we may choose to not designate our interest rate swap and forward contracts. If a swap or forward contract is not designated as a hedge, the changes in fair value of these instruments is immediately recognized in earnings in Interest expense, net in the Consolidated Statements of Operations.
Segment Information	Segment InformationOur data centers have similar revenues and operating expenses across all geographic locations. The service offerings and delivery of services are provided in a similar manner, using the same types of facilities and similar technologies. Our chief operating decision maker, the Company's Chief Executive Officer, reviews our financial information on an aggregate basis and makes decisions about the allocations of Company resources and as a result, we have one reportable business segment.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to use judgment in the application of accounting policies, including making estimates and assumptions. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different or different assumptions were made, it is possible that different accounting policies would have been applied, resulting in different financial results or a different presentation of our financial statements. Estimates, judgments and assumptions are based on historical experiences that we believe to be reasonable under the circumstances. From time to time we re-evaluate those estimates and assumptions. Our discussion and analysis of financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with GAAP. Our management evaluates these estimates on an ongoing basis, based upon information currently available and on various assumptions management believes are reasonable as of the date of the financial statements. Significant estimates include and are related to determining lease terms and revenue recognition, the fair value for purchase price allocations for business combinations and asset acquisitions, capitalization of costs and the useful lives of real estate and other long-lived assets. Our actual results may differ from these estimates.
Recently Issued Accounting Standards	Recently Issued Accounting Standards Recently Adopted Accounting Pronouncements Income Taxes On January 1, 2021, we adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which simplifies various aspects related to the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. The adoption did not have a significant impact on the Company. Reference Rate Reform On March 12, 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04"). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the first quarter of 2021, we elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives in our financial statements consistent with past presentation. We continue to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur. Lease Modification Q&A Due to the business disruptions and challenges severely affecting the global economy caused by the COVID-19 pandemic, lessors may provide rent deferrals and other lease concessions to lessees. While the lease modification guidance in ASC 842, Leases, addresses changes to lease terms resulting from negotiations between the lessee and the lessor, this guidance did not contemplate concessions being so rapidly executed to address the impact from the COVID-19 pandemic on the lessor's business. In April 2020, FASB issued a question and answer document (the “Lease Modification Q&A”) focused on the application of lease accounting guidance to lease concessions provided as a result of the COVID-19 pandemic. Under the new accounting standard for leases, the Company must determine, on a lease by lease basis, if a lease concession resulted in a lease modification. The Lease Modification Q&A allows the Company, if certain criteria have been met, to bypass the lease by lease analysis, and instead elect to either apply the lease modification accounting framework or not, with such election applied consistently to leases with similar characteristics and circumstances. The adoption of this guidance has not had a material impact on our financial statements. Guarantor Financial Information In March 2020, the SEC amended Rule 3-10 of Regulation S-X to reduce and simplify financial disclosure requirements for issuers and guarantors of registered debt offerings. This new guidance replaces the previous requirement to provide condensed consolidating financial information in the registrant’s financial statements with a requirement to provide alternative financial disclosures in Item 7 "Management's Discussion and Analysis of Financial Condition and Results of Operations" or its financial statements. We adopted these amendments as of April 1, 2020, and the alternative disclosures are presented in Item 7 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the information previously included in the Notes to Consolidated Financial Statements has been removed. Intangibles-Goodwill and Other Internal-Use Software On January 1, 2020, we adopted ASU 2018-15, Intangibles Goodwill and Other Internal Use Software on a prospective basis. The adoption did not have a significant impact on the Company. Fair Value Measurement On January 1, 2020, we adopted ASU 2018-13, Fair Value Measurement, which changes the fair value measurement disclosure requirements of ASC 820, Fair Value Measurement. The amendments are part of the FASB’s disclosure framework project to improve the effectiveness of disclosures important to financial statement users including information about assets and liabilities measured at fair value in our Consolidated Balance Sheets. The adoption did not have a significant impact on the Company. Financial Instruments - Credit Losses On January 1, 2020, we adopted ASU 2016-13, Financial Instruments-Credit Losses (CECL), which requires certain financial assets to be presented at the net amount expected to be collected. CECL and its related amendments apply to our customer contract trade receivables, notes receivable and net investments in leases. Our Rent and other receivables are primarily comprised of rent receivables, which are not within the scope of this sub-topic. The adoption did not have a significant impact on the Company because of our limited exposure to financial instruments subject to this standard. Leases We adopted ASU 2016-02 (codified in ASC 842, Leases ) on January 1, 2019, applied the package of practical expedients included therein and utilized the modified retrospective transition method with the cumulative effect of transition recorded as an adjustment to retained earnings on the effective date. By applying the modified retrospective transition method, the presentation of financial information for periods prior to January 1, 2019 was not restated. We elected the package of practical expedients, which permits us to not reassess (1) whether any expired or existing contracts are or contain leases, (2) the lease classification for any expired or existing leases, and (3) the treatment of any initial direct costs for any existing leases as of the effective date. We did not elect the hindsight practical expedient, which permits entities to use hindsight in determining the lease term and assessing impairment. As a Lessee The ASU requires that a liability be recorded on the balance sheet for all leases where the reporting entity is a lessee, based on the present value of future lease obligations discounted based on the implicit rate or alternatively our incremental borrowing rate. The implicit rate is generally not determinable and, as a result, we use our incremental borrowing rate at the lease commencement date to determine the present value. We determine our incremental borrowing rate based on an estimate of our existing yield curve at the lease commencement. The rates are then adjusted for various factors to estimate the company’s secured rate, including the lease term and collateralization. The determination of our incremental borrowing rate requires judgment. A corresponding right-of-use ("ROU") asset will also be recorded. Amortization of the lease obligation and the ROU asset for leases classified as operating leases are on a straight-line basis. Leases classified as financing leases are required to be accounted for as financing arrangements similar to the accounting treatment for capital leases under ASC 840, Leases (the former accounting standard for all leases, ("ASC 840")). We elected the practical expedient to combine our lease and related non-lease components by asset class for our leases. We elected the practical expedient to not evaluate land easements not previously accounted for as leases prior to the entity’s adoption of the new accounting standard for leases. We elected to apply the short-term lease measurement and recognition exemption available for leases under the new accounting standard for leases that have an original lease term of 12 months or less. The adoption of ASC 842 had a significant impact on our Consolidated Balance Sheets due to the recognition of approximately $87.0 million of ROU assets and $123.2 million of lease liabilities for operating leases. We recognized a $9.5 million cumulative effect adjustment to retained earnings. The adjustment to retained earnings was driven principally by measurement of operating lease liabilities at the present value of the remaining lease payments at the adoption date of January 1, 2019. The increase was offset in part by impairment of ROU assets associated with one build-to-suit ("BTS") arrangement recognized as an operating lease under the new accounting standard for leases. Additionally, we de-recognized certain previously recognized BTS lease assets and liabilities which under the new accounting standard for leases are recognized as operating lease ROU assets and lease liabilities. Prior to the adoption of the new accounting standard for leases, these leases were accounted as financing arrangements or BTS leases assets and liabilities and recorded as buildings and improvement and lease financing arrangements. Prior to the adoption of the new accounting standard for leases, BTS lease assets were amortized over the useful life of the asset and recorded as amortization expense and accretion of BTS lease liability was recorded as an interest expense in the Consolidated Statements of Operations. Upon adoption of the new accounting standard for leases, BTS leases are accounted as operating leases and amortization and accretion of lease liabilities of these operating leases are recorded as lease expenses in property operating expenses in our Consolidated Statements of Operations. As a Lessor The accounting for lessors remained largely unchanged from ASC 840. However, the new accounting standard for leases requires that lessors expense certain costs to obtain a lease that are not incremental to origination of a lease. Upon adoption, initial direct costs that are not incremental are expensed as general and administrative expense in our Consolidated Statements of Operations. Prior to the adoption of the new standard, these costs were capitalizable. As a result of electing the package of practical expedients, initial direct costs have not been reassessed prior to the effective date and therefore adoption of the lease standard did not have an impact on our previously reported Consolidated Statements of Operations with respect to initial direct costs. In addition, under the new accounting standard for leases, certain exceptions under the previous standard for real estate no longer are applicable in the evaluation of the lease classification as an operating, sales type or direct financing lease. In the event that a real estate lease is classified as a sales-type lease, subject to certain conditions, a gain or loss is recognized based on the present value of the lease payments and residual value. We elected the practical expedient to combine all of our lease and nonlease revenue components into a single combined lease component as nonlease components have the same pattern of transfer as the related predominant operating lease components. Our customer leases include options to extend or terminate the lease agreements. We do not generally include extension or termination options in a customer’s lease term for lease classification purposes or for recognizing lease revenue unless we are reasonably certain the customer will exercise these extension or termination options at lease commencement. New Accounting Pronouncements Not Yet Adopted In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Topic 470) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Topic 815). This ASU reduces the number of accounting models for convertible debt instruments and convertible preferred stock, and amends the guidance for the derivatives scope exception for contracts in an entity's own equity. The ASU also amends and makes targeted improvements to the related earnings per share guidance. The ASU is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The standard allows for either modified or full retrospective transition methods. The Company is currently evaluating this ASU but does not expect it to have a significant impact on its financial statements.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Future Minimum Lease Payments under Non-Cancellable Operating Leases	At December 31, 2021, the future minimum lease payments to be received under non-cancellable operating leases, excluding month-to-month arrangements and metered power reimbursements are shown below (in millions): As of December 31, 2021 Minimum Lease Payments 2022 $ 827.1 2023 684.6 2024 551.9 2025 467.8 2026 369.9 Thereafter 1,018.2 Total $ 3,919.5 At December 31, 2020, the future minimum lease payments to be received under non-cancellable operating leases, excluding month-to-month arrangements and metered power reimbursements are shown below (in millions): As of December 31, 2020 Minimum Lease Payments 2021 $ 771.1 2022 658.5 2023 527.5 2024 409.3 2025 339.1 Thereafter 922.9 Total $ 3,628.4
Disaggregation of Revenue	For the years ended December 31, 2021, 2020 and 2019, lease revenue disaggregated by primary revenue stream is as follows (in millions): Lease revenue Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Colocation (Minimum lease payments) $ 924.1 $ 842.1 $ 793.5 Metered power reimbursements (Variable lease payments) 259.0 161.4 138.8 Total lease revenue $ 1,183.1 $ 1,003.5 $ 932.3 For the years ended December 31, 2021, 2020 and 2019, revenue from contracts with customers disaggregated by primary revenue stream is as follows (in millions): Revenue from contracts with customers Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Equipment sales and services $ 4.2 $ 10.6 $ 29.7 Other revenue 18.4 19.4 19.3 Total revenue from contracts with customers $ 22.6 $ 30.0 $ 49.0

Leases - As a Lessee (Tables)

Leases - As a Lessee (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Lease, Cost	The components of lease expense are as follows (in millions): Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Operating lease cost $ 20.8 $ 20.4 $ 20.3 Finance lease cost: Amortization of assets 2.0 2.1 2.3 Interest on lease liabilities 3.4 1.5 1.7 Total net lease cost $ 26.2 $ 24.0 $ 24.3 Supplemental cash flow and other information related to leases is as follows (in millions): Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 24.3 $ 23.4 $ 22.1 Operating cash flows from finance leases 3.4 1.5 1.7 Financing cash flows from finance leases 4.4 3.5 2.9 Non-cash right-of-use assets obtained in exchange for lease liabilities: Operating leases $ — $ 65.2 $ 175.1 Finance leases 129.0 — 0.8
Assets And Liabilities, Lessee	Supplemental balance sheet information related to leases is as follows (in millions, except lease term and discount rate): December 31, 2021 December 31, 2020 Operating leases: Operating lease right-of-use assets $ 143.7 $ 211.4 Operating lease liabilities $ 178.8 $ 249.1 Finance leases: Property and equipment, at cost $ 163.0 $ 34.7 Accumulated amortization (8.5) (7.1) Property and equipment, net $ 154.5 $ 27.6 Finance lease liabilities $ 156.9 $ 29.1 Weighted average remaining lease term (in years): Operating leases 16.4 14.3 Finance leases (a) 27.3 18.2 Weighted average discount rate: Operating leases 4.0 % 3.7 % Finance leases (a) 2.6 % 4.7 % (a) Excludes a 999-year ground lease in Dublin, The Republic of Ireland entered into during the third quarter of 2019. The Dublin property is under active development and the finance lease is included in Construction in progress, including land under development on the Consolidated Balance Sheets.
Lessee, Operating Lease, Liability, Maturity	Maturities of lease liabilities were as follows (in millions): As of December 31, 2021 Operating Leases Finance Leases 2022 $ 25.6 $ 7.7 2023 20.8 6.7 2024 16.1 6.4 2025 14.4 6.6 2026 12.6 6.9 Thereafter 155.0 187.9 Total lease payments $ 244.5 $ 222.2 Less: Imputed interest (65.7) (65.3) Total lease obligations $ 178.8 $ 156.9 Maturities of lease liabilities were as follows (in millions): As of December 31, 2020 Operating Leases Finance Leases 2021 $ 27.8 $ 4.2 2022 27.9 3.0 2023 23.9 2.0 2024 19.4 1.4 2025 17.8 1.5 Thereafter 221.6 30.5 Total lease payments $ 338.4 $ 42.6 Less: Imputed interest (89.3) (13.5) Total lease obligations $ 249.1 $ 29.1
Finance Lease, Liability, Maturity	Maturities of lease liabilities were as follows (in millions): As of December 31, 2021 Operating Leases Finance Leases 2022 $ 25.6 $ 7.7 2023 20.8 6.7 2024 16.1 6.4 2025 14.4 6.6 2026 12.6 6.9 Thereafter 155.0 187.9 Total lease payments $ 244.5 $ 222.2 Less: Imputed interest (65.7) (65.3) Total lease obligations $ 178.8 $ 156.9 Maturities of lease liabilities were as follows (in millions): As of December 31, 2020 Operating Leases Finance Leases 2021 $ 27.8 $ 4.2 2022 27.9 3.0 2023 23.9 2.0 2024 19.4 1.4 2025 17.8 1.5 Thereafter 221.6 30.5 Total lease payments $ 338.4 $ 42.6 Less: Imputed interest (89.3) (13.5) Total lease obligations $ 249.1 $ 29.1

Equity Investments (Tables)

Equity Investments (Tables)	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Trading, and Equity Securities, FV-NI	The Company has the following equity investments where it has a noncontrolling interest in the investees (in millions): Equity Investments as of: Investees Equity Method December 31, 2021 December 31, 2020 GDS, Class A share equivalent Fair value $ — $ 44.2 ODATA investments Cost method 30.3 22.9 Equity investments $ 30.3 $ 67.1
Unrealized Gain (Loss) on Marketable Equity Investment	The Company recognized Gains on marketable equity investment in GDS ADSs held and sold as follows: IN MILLIONS Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Gain on marketable equity investment $ 2.4 $ 89.5 $ 132.3 Less: Gain recognized on marketable equity investment sold 2.4 69.6 66.7 Unrealized gain on marketable equity investment $ — $ 19.9 $ 65.6

Goodwill, Intangible and Othe_2

Goodwill, Intangible and Other Long-Lived Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Value of Major Classes of Intangible Assets	Summarized below are the carrying values for the major classes of intangible assets: IN MILLIONS For the year ended December 31, 2021 2020 Weighted- Gross Accumulated Total Gross Accumulated Total Customer relationships 8 $ 247.1 $ (174.2) $ 72.9 $ 247.1 $ (163.1) $ 84.0 Trademark/tradename 3 11.5 (9.8) 1.7 11.6 (9.0) 2.6 Favorable leasehold interest 38 5.7 (2.1) 3.6 5.7 (1.6) 4.1 In-place customer leases 3 138.3 (92.8) 45.5 140.4 (74.6) 65.8 Above and below market leases 4 2.3 (1.2) 1.1 2.3 (1.0) 1.3 Total $ 404.9 $ (280.1) $ 124.8 $ 407.1 $ (249.3) $ 157.8
Schedule of Estimated Amortization Expense for Finite-Lived Intangible Assets	The following table presents estimated amortization expense for each of the next five years and thereafter, commencing January 1, 2022: IN MILLIONS Total 2022 $ 29.2 2023 20.3 2024 18.6 2025 17.3 2026 9.3 Thereafter 30.1 Total $ 124.8

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	As of December 31, 2021 and 2020, the components of Other assets are as follows (in millions): December 31, 2021 December 31, 2020 Deposits for contract obligations $ 193.4 $ — Deferred leasing and other contract costs 87.0 62.4 Prepaid expenses 19.8 19.1 Non-real estate assets, net 12.3 13.8 Other assets 39.7 38.1 Total $ 352.2 $ 133.4

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-term debt Instruments	As of December 31, 2021 and 2020, the components of Debt are as follows (unless otherwise noted, interest rate and maturity date information are as of December 31, 2021) (in millions): December 31, 2021 December 31, 2020 Interest Rate Maturity Date Amended Credit Agreement: Revolving Credit Facility: March 2024 (b) EUR Revolver $ — $ 275.9 Monthly EURIBOR + 1.00% GBP Revolver — 157.0 Monthly LIBOR + 1.00% 2023 Term Loan Facility (a) 100.0 100.0 Monthly LIBOR + 1.20% March 2023 (c) 2025 Term Loan Facility (a) 700.0 700.0 Monthly LIBOR + 1.20% March 2025 2024 Notes, including bond discount of $0.6 million and $0.7 million, respectively 599.4 599.3 2.900 % November 2024 2027 Notes, including bond discount of $0.6 million and $0.6 million, respectively (d) 566.6 612.6 1.450 % January 2027 2028 Notes, including bond discount of $6.9 million (e) 560.3 — 1.125 % May 2028 2029 Notes, including bond discount of $1.4 million and $1.6 million, respectively 598.6 598.4 3.450 % November 2029 2030 Notes, including bond discount of $4.2 million and $4.7 million, respectively 395.8 395.3 2.150 % November 2030 Deferred financing costs (27.8) (29.5) — — Total $ 3,492.9 $ 3,409.0 (a) - Monthly USD LIBOR as of December 31, 2021 was 0.11%. (b) - The Company has an option to exercise a one (c) - The Company has an option to exercise two 1-year extension options, subject to certain conditions. (d) - The 2027 Notes represent €495.3 million, including bond discount of €0.7 million of Euro bonds. (e) - The 2028 Notes represent €489.2 million, including bond discount of €6.7 million, of Euro bonds.
Schedule of Maturities of Long-term Debt	The following table summarizes aggregate maturities of the Amended Credit Agreement and 2024 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes for the five years subsequent to December 31, 2021, and thereafter: IN MILLIONS Amended Credit Agreement (a)(b) Senior Notes Total 2022 $ — $ — $ — 2023 100.0 — 100.0 2024 — 600.0 600.0 2025 700.0 — 700.0 2026 — — — Thereafter — 2,134.4 2,134.4 Total debt $ 800.0 $ 2,734.4 $ 3,534.4 (a) - The Company has an option to exercise a one (b) - The Company has an option to exercise two one

Fair Value of Financial Instr_2

Fair Value of Financial Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Carrying Value and Fair Value of Other Financial Instruments	The carrying value and fair value of other financial instruments are as follows (in millions): IN MILLIONS December 31, 2021 December 31, 2020 Carrying Value Fair Value Carrying Value Fair Value Debt: Variable Rate Debt: Revolving Credit Facility $ — $ — $ 432.9 $ 432.9 2023 Term Loan Facility 100.0 100.0 100.0 100.0 2025 Term Loan Facility 700.0 700.0 700.0 700.0 Fixed Rate Debt: 2024 Notes - 2.900% (1) 599.4 620.3 599.3 640.7 2027 Notes - 1.450% (1) 566.6 577.3 612.6 619.9 2028 Notes - 1.125% (1) 560.3 565.5 — — 2029 Notes - 3.450% (1) 598.6 653.2 598.4 644.1 2030 Notes - 2.150% (1) 395.8 395.7 395.3 388.6 Derivative Contracts: Cross Currency Swaps Liability (2) 13.5 13.5 52.2 52.2 Interest Rate Swap Liability (2) 2.4 2.4 7.0 7.0 Equity Investments carried at Fair Value: GDS equity investment (3) — — 44.2 44.2 (1) - The fair value of notes are based on quoted market prices for these notes, which is considered Level 1 of the fair value hierarchy. (2) - The fair values of our cross currency and interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash flows and the discounted expected variable cash flows based on an expectation of future interest rates derived from Level 2 observable market interest rate curves. (3) - The fair value is based on quoted market prices for the GDS ADSs, which is considered Level 1 of the fair value hierarchy.
Summary of Derivative Positions	The following table summarizes the Company's derivative positions as of December 31, 2021 and 2020 (in millions): December 31, 2021 December 31, 2020 Maturity Date Notional Amount Hedged Risk Asset Liability Asset Liability Designated derivatives Cross Currency Swaps EUR - USD 3/29/2023 $ 250.0 Net investment hedge $ — $ 6.7 $ — $ 26.0 EUR - USD 3/29/2023 250.0 Net investment hedge — 6.8 — 26.2 Interest Rate Swaps USD Libor 3/29/2023 300.0 Interest rate hedge - Float to fixed — 2.4 — 7.0 Total $ — $ 15.9 $ — $ 59.2
Effect of Derivative Financial Instruments	The following table presents the effect of our derivative financial instruments on our accompanying consolidated financial statements (in millions): December 31, 2021 December 31, 2020 Derivatives in Cash Flow Hedging Relationships Cross-Currency and Interest Rate Swaps: Amount of gain (loss) recognized in OCI for derivatives $ 43.4 $ (53.0) Amount of gain (loss) reclassified from Accumulated OCI for derivatives (1) $ (3.3) $ (1.7) (1) - Gains and (losses) are recognized in Interest expense, net.

Income (Loss) per Share (Tables

Income (Loss) per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net (Loss) Income Per Share	The following table reflects the computation of basic and diluted Net income per share: IN MILLIONS, except per share amounts Year Ended Year Ended Year Ended For December 31, 2021 2020 2019 Basic Diluted Basic Diluted Basic Diluted Numerator: Net income $ 25.3 $ 25.3 $ 41.4 $ 41.4 $ 41.4 $ 41.4 Less: Restricted stock dividends (0.4) (0.4) (0.5) (0.5) (0.7) (0.7) Net income available to stockholders $ 24.9 $ 24.9 $ 40.9 $ 40.9 $ 40.7 $ 40.7 Denominator: Weighted average common outstanding-basic 123.8 123.8 117.3 117.3 112.1 112.1 Performance-based restricted stock and units 0.1 0.3 0.4 Weighted average shares outstanding-diluted 123.9 117.6 112.5 EPS: Net income per share-basic $ 0.20 $ 0.35 $ 0.36 Effect of dilutive shares: Net income per share-diluted $ 0.20 $ 0.35 $ 0.36

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Schedule Of Summary Of Forward Sales Of Equity	The following table represents a summary of forward sale of equity of our common stock for the year ended December 31, 2021 (in millions): Offering Program Forward Shares Sold/(Settled) Net Proceeds Received Remaining Proceeds Available (1) Total at December 31, 2020 6.8 $ — $ 484.7 Forward adjustments — — (7.6) May 2020 Forward Offering settlement (1.4) 95.3 (95.3) May 2020 Forward Offering settlement (1.3) 95.5 (95.5) May 2021 Forward Offering - Sales 0.3 22.5 June 2021 Forward Offering - Sales 1.6 116.6 June 2021 Forward Offering - Sales 1.1 90.8 September 2020 Forward Offering settlement (1.4) 100.5 (100.5) September 2020 Forward Offering settlement (1.6) 112.5 (112.5) November 2020 Forward Offering settlement (1.1) 73.3 (73.3) June 2021 Forward Offering settlement (1.6) 116.6 (116.6) Total as of December 31, 2021 1.4 $ 593.7 $ 113.3 (1) As of December 31, 2021, the total estimated proceeds, net of adjustments for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers' stock borrowing costs and (iii) scheduled dividends adjustments is $113.3 million subject to further adjustment when the forward offerings are settled as described above.
Schedule of Declared Cash Dividends and Distributions	We have declared cash dividends on common shares and distributions on operating partnership units for the years ended December 31, 2021 and 2020 as presented in the table below: Record date Payment date Cash dividend per share or operating partnership unit March 27, 2020 April 9, 2020 $0.50 June 26, 2020 July 10, 2020 $0.50 September 25, 2020 October 9, 2020 $0.51 January 4, 2021 January 8, 2021 $0.51 March 26, 2021 April 9, 2021 $0.51 June 25, 2021 July 9, 2021 $0.51 September 24, 2021 October 8, 2021 $0.52 January 3, 2022 January 7, 2022 $0.52

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Compensation Expense	Stock-based compensation expense was as follows: For the periods ended December 31, 2021 2020 2019 2016 Grants $ — $ — $ 1.1 2017 Grants — 0.5 3.1 2018 Grants 0.7 3.9 5.4 2019 Grants and ESPP expense 2.0 5.5 7.1 2020 Grants and ESPP expense 10.9 8.5 — 2021 Grants and ESPP expense 9.0 — — Total $ 22.6 $ 18.4 $ 16.7
Schedule of Restricted Stock Awards Activity	The following tables summarize the unvested restricted stock units, restricted stock, LTIP Units and stock options activity and the weighted average fair value of these shares at the date of grant for the year ended December 31, 2021 (market-based awards are reflected at the target amount of the grant): Restricted Stock Units ("RSU") 2021 Restricted Stock Units Weighted Outstanding January 1, 484,890 $ 66.66 Granted 20,222 69.92 TSR and other adjustments (a) 186,239 86.98 Exercised (431,074) 62.68 Forfeited (40,131) 119.30 Outstanding December 31, 220,146 $ 82.33 (a) TSR adjustments represent the incremental shares earned for the total stockholder return (TSR) performance metric exceeding target and resulting in 200% payout for the 2018 LTIP Performance Awards. Restricted Stock ("RS") 2021 Restricted Stock Weighted Outstanding January 1, 118,233 $ 74.12 Granted 119,323 74.10 Exercised (150,353) 74.17 Forfeited (9,163) 72.25 Outstanding December 31, 78,040 $ 74.21 LTIP Units 2021 LTIP Units Weighted Average Grant Date Fair Value Outstanding January 1, — $ — Granted 149,061 83.15 Exercised — — Forfeited (53,770) 87.08 Outstanding December 31, 95,291 $ 80.93
Schedule of Unvested Stock Options	Stock Options 2021 Options Weighted Outstanding January 1, 97,801 $ 30.87 Granted — — Exercised (95,196) 31.07 Forfeited — — Outstanding December 31, 2,605 23.58 Exercisable at December 31, 2,605 23.58 Vested and expected to vest 2,605 $ 23.58
Schedule of Option Valuation Assumptions	The following table summarizes the stock option assumptions for the years ended December 31, 2021, 2020 and 2019: Options Outstanding Options Exercisable Assumption Range Exercise Prices Number Weighted Number Weighted Risk-Free Expected Annual Dividend Yield Expected Expected 2019 $23.58 51,985 3.3 51,985 3.3 0.92% 3.4% 6.0 35% $28.42 143,358 5.1 143,358 5.1 1.6% - 1.75% 4.4% 5.5-6.5 32.5% - 37.5% $30.74 12,719 5.6 12,719 5.6 1.6% - 1.75% 4.4% 5.5-6.5 32.5% - 37.5% $36.99 167,024 6.1 167,024 6.1 1.47% - 1.64% 4.1% 5.5-6.5 27.5% - 35.0% 2020 $23.58 16,930 0.9 16,930 0.9 0.92% 3.4% 6.0 35% $28.42 43,317 0.6 43,317 0.6 1.6% - 1.75% 4.4% 5.5-6.5 32.5% - 37.5% $36.99 37,554 0.6 37,554 0.6 1.47% - 1.64% 4.1% 5.5-6.5 27.5% - 35.0% 2021 $23.58 2,605 0.8 2,605 0.8 0.92% 3.4% 6.0 35%

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Income tax (benefit) expense for the years ended December 31, 2021, 2020 and 2019 as reported in the accompanying Consolidated Statements of Operations was comprised of the following: Year Ended December 31, IN MILLIONS 2021 2020 2019 Current Federal $ 1.9 $ 1.5 $ 1.7 State 2.2 2.0 1.9 Foreign 0.5 5.0 0.2 Total current expense $ 4.6 $ 8.5 $ 3.8 Deferred: Federal $ — $ — $ — State — — — Foreign (9.5) (12.1) (7.5) Total deferred benefit (9.5) (12.1) (7.5) Total income tax benefit $ (4.9) $ (3.6) $ (3.7)
Schedule of Effective Income Tax Rate Reconciliation	An income tax expense reconciliation between the U.S. statutory tax rate and the effective tax rate is as follows: Year Ended December 31, IN MILLIONS 2021 2020 2019 Income tax at U.S. federal statutory income tax rate $ 4.3 $ 3.9 $ 7.9 State and local taxes, net of federal income tax benefit 2.2 1.6 1.7 Impact of REIT status (16.9) (18.2) (13.7) Permanent differences — 0.1 (0.7) Foreign tax rate and currency differences (1.6) (2.7) (1.0) Anti-hybrid disallowances 1.9 2.4 1.6 Deferred tax true ups and other 4.6 1.0 — Unrecognized tax benefits 0.5 5.0 — Valuation allowance 0.1 3.3 0.5 Income tax benefit $ (4.9) $ (3.6) $ (3.7)
Schedule of Deferred Tax Assets and Liabilities	The components of the Company’s deferred tax assets and liabilities are as follows: Year Ended December 31, IN MILLIONS 2021 2020 Deferred tax assets Net operating loss carryforwards $ 18.9 $ 19.7 Accounts receivable/payable and other 8.7 9.1 Disallowed interest and other expenses 4.9 3.4 Finance leases 1.9 1.6 Total gross deferred tax assets $ 34.4 $ 33.8 Valuation allowance (12.6) (12.2) Total gross deferred tax assets, net $ 21.8 $ 21.6 Deferred tax liabilities Deferred rent and other $ (8.6) $ (1.9) Fixed assets (50.1) (67.5) Intangibles (2.9) (5.2) Total gross deferred tax liabilities $ (61.6) $ (74.6) Total net deferred tax liabilities $ (39.8) $ (53.0)
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the Company’s beginning and ending liability for unrecognized tax benefits is as follows: IN MILLIONS 2021 2020 2019 Balance at January 1 $ 5.0 $ — $ — Additions related to acquisitions — — — Additions for tax positions for the current year — 5.0 — Additions for tax positions of prior years — — — Reductions for tax positions of prior years — — — Settlements — — — Balance at December 31 $ 5.0 $ 5.0 $ —

Description of Business (Detail

Description of Business (Details)	12 Months Ended
	Dec. 31, 2021centerdataCenter	Nov. 24, 2021$ / shares
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of data centers | dataCenter	56
Number of recovery centers | center	1
CyrusOne Merger
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Share price (usd per share) | $ / shares		$ 90.50

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)segment	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Summary Of Significant Accounting Policies [Line Items]
Impairment losses and (gain) loss on asset disposals, net	$ 0.5	$ 11.2
Rent and other receivables	420.4	334.2
Contract assets	$ 0.5	0.4
Number of business segments | segment	1
Revenue	$ 1,205.7	1,033.5	$ 981.3
Net investment in real estate	5,577.9	5,265.5
Straight-line rent receivable, net
Summary Of Significant Accounting Policies [Line Items]
Rent and other receivables	174.1	172.6
U.S. Data Centers
Summary Of Significant Accounting Policies [Line Items]
Impairment losses and (gain) loss on asset disposals, net		$ 8.8
Atlanta
Summary Of Significant Accounting Policies [Line Items]
Impairment losses and (gain) loss on asset disposals, net	$ 2.4
South Bend - Monroe
Summary Of Significant Accounting Policies [Line Items]
Impairment losses and (gain) loss on asset disposals, net			$ 0.7
Minimum
Summary Of Significant Accounting Policies [Line Items]
Management service contracts, term	1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Management service contracts, term	5 years

Recently Issued Accounting St_2

Recently Issued Accounting Standards - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU assets	$ 143.7	$ 211.4
Operating lease liabilities	178.8	249.1
Retained earnings	$ (1,200.1)	$ (966.6)
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU assets			$ 87
Operating lease liabilities			123.2
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ 9.5

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	$ 1,205.7	$ 1,033.5	$ 981.3
Balances from customers accounts receivables	0.8	2.3
Outside of the United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	0.4	4.7	2.9
Contracts with customers
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	$ 15.1	$ 15.9	$ 15.9
Customer 1 | Revenue | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk (as a percent)	19.00%	19.00%	21.00%

Revenue Recognition - Future Mi

Revenue Recognition - Future Minimum Lease Payments under Non-Cancellable Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
2022	$ 827.1	$ 771.1
2023	684.6	658.5
2024	551.9	527.5
2025	467.8	409.3
2026	369.9	339.1
Thereafter	1,018.2	922.9
Total	$ 3,919.5	$ 3,628.4

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 1,205.7	$ 1,033.5	$ 981.3
Lease revenue
Disaggregation of Revenue [Line Items]
Revenue	1,183.1	1,003.5	932.3
Colocation (Minimum lease payments)
Disaggregation of Revenue [Line Items]
Revenue	924.1	842.1	793.5
Metered power reimbursements (Variable lease payments)
Disaggregation of Revenue [Line Items]
Revenue	259	161.4	138.8
Revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue	22.6	30	49
Equipment sales and services
Disaggregation of Revenue [Line Items]
Revenue	4.2	10.6	29.7
Other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 18.4	$ 19.4	$ 19.3

Leases - As a Lessee - Narrativ

Leases - As a Lessee - Narrative (Details)	12 Months Ended
	Dec. 31, 2021facility
Lessee, Lease, Description [Line Items]
Number of facilities, finance lease	6
Data Center
Lessee, Lease, Description [Line Items]
Number of facilities, operating lease	12
Office
Lessee, Lease, Description [Line Items]
Number of facilities, operating lease	3
Ground Lease 1 | Dublin, Ireland
Lessee, Lease, Description [Line Items]
Finance lease, term of contract	999 years
Minimum
Lessee, Lease, Description [Line Items]
Finance lease, remaining term of contract	1 year
Operating lease, term of contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Finance lease, remaining term of contract	29 years
Operating lease, term of contract	23 years

Leases - As a Lessee - Lease Co

Leases - As a Lessee - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 20.8	$ 20.4	$ 20.3
Operating lease cost		20.4	20.3
Finance lease cost:
Amortization of assets	2	2.1	2.3
Interest on lease liabilities	3.4	1.5	1.7
Total net lease cost	$ 26.2	$ 24	$ 24.3

Leases - As a Lessee - Suppleme

Leases - As a Lessee - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating leases:
Operating lease right-of-use assets	$ 143.7	$ 211.4
Operating lease liabilities	178.8	249.1
Finance leases:
Property and equipment, at cost	163	34.7
Accumulated amortization	$ (8.5)	$ (7.1)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Property and equipment, net	$ 154.5	$ 27.6
Finance lease liabilities	$ 156.9	$ 29.1
Weighted average remaining lease term (in years):
Operating leases	16 years 4 months 24 days	14 years 3 months 18 days
Finance leases	27 years 3 months 18 days	18 years 2 months 12 days
Weighted average discount rate:
Operating leases	4.00%	3.70%
Finance leases	2.60%	4.70%

Leases - As a Lessee - Supple_2

Leases - As a Lessee - Supplemental Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 24.3	$ 23.4	$ 22.1
Operating cash flows from finance leases		1.5	1.7
Financing cash flows from finance leases	4.4	3.5	2.9
Non-cash right-of-use assets obtained in exchange for lease liabilities:
Operating leases	0	65.2	175.1
Finance leases	129	0	0.8
Interest on lease liabilities	$ 3.4	$ 1.5	$ 1.7

Leases - As a Lessee - Maturiti

Leases - As a Lessee - Maturities of Operating and Financing Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Leases
2022	$ 25.6	$ 27.8
2023	20.8	27.9
2024	16.1	23.9
2025	14.4	19.4
2026	12.6	17.8
Thereafter	155	221.6
Total lease payments	244.5	338.4
Less: Imputed interest	(65.7)	(89.3)
Total lease obligations	178.8	249.1
Finance Leases
2022	7.7	4.2
2023	6.7	3
2024	6.4	2
2025	6.6	1.4
2026	6.9	1.5
Thereafter	187.9	30.5
Total lease payments	222.2	42.6
Less: Imputed interest	(65.3)	(13.5)
Total lease obligations	$ 156.9	$ 29.1

Investment in Real Estate - Lan

Investment in Real Estate - Land for future development and Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)a	Dec. 31, 2020USD ($)a
Madrid, Spain And Amsterdam, The Netherlands | Land
Business Acquisition [Line Items]
Purchase price | $	$ 63.8
Madrid, Spain And Amsterdam, The Netherlands | Land For Future Development
Business Acquisition [Line Items]
Area of land (in acres) | a	35
Frankfurt, Germany And London | Land For Future Development
Business Acquisition [Line Items]
Area of land (in acres) | a		35
Purchase price | $		$ 58

Investment in Real Estate - Lea

Investment in Real Estate - Leases of Real Estate (Details) ft² in Thousands	Feb. 28, 2021ft²extensionMW	Jun. 30, 2021dataCenter	Mar. 31, 2020ft²extensionMW
London, UK
Business Acquisition [Line Items]
Operating lease, term of contract	20 years
London, UK | Area leased and purchased for future development
Business Acquisition [Line Items]
Area of building shell (in square feet) | ft²	130
Data center output (MW) | MW	18
Number of renewal options | extension	3
Operating lease, renewal term	15 years
Number of Data Centers | dataCenter		2
Paris, France
Business Acquisition [Line Items]
Operating lease, term of contract			25 years
Paris, France | Area leased and purchased for future development
Business Acquisition [Line Items]
Area of building shell (in square feet) | ft²			45
Data center output (MW) | MW			27
Number of renewal options | extension			1
Operating lease, renewal term			25 years

Investment in Real Estate - Rea

Investment in Real Estate - Real Estate Related Capital Expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Construction in progress, including land under development	$ 765.9	$ 982.2	$ 946.3
Construction in progress, land under active development	28	5.1
Payments to Acquire Other Property, Plant, and Equipment and Real Estate Held For Investment	(727)	(910.5)
Impairment losses and (gain) loss on asset disposals, net	0.5	11.2
Land
Business Acquisition [Line Items]
Impairment losses and (gain) loss on asset disposals, net		2.4
Land | Madrid, Spain And Amsterdam, The Netherlands
Business Acquisition [Line Items]
Purchase price	$ 63.8
Data centers
Business Acquisition [Line Items]
Impairment losses and (gain) loss on asset disposals, net		$ 8.8

Equity Investments - Schedule o

Equity Investments - Schedule of Investees (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Oct. 18, 2017
Schedule of Equity Method Investments [Line Items]
Value of investment	$ 30.3	$ 67.1
Equity investments	30.3	67.1
GDS Holdings Limited
Schedule of Equity Method Investments [Line Items]
Value of investment	0	44.2	$ 100
ODATA investments
Schedule of Equity Method Investments [Line Items]
Cost method	$ 30.3	$ 22.9

Equity Investments - Narrative

Equity Investments - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 18, 2017	Jan. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Value of investment			$ 30.3	$ 67.1
Sales price			46.6	144.1	$ 199
Affiliated Entity | ODATA
Schedule of Equity Method Investments [Line Items]
Additional investments			7.4	6.5
GDS
Schedule of Equity Method Investments [Line Items]
Newly issued American depository shares (in shares)	8,000,000
Price per ordinary share (in dollars per share)	$ 12.45
Discount rate	4.00%
Value of investment	$ 100		0	$ 44.2
American depository shares equivalent (in shares)	8
Number of GDS ADSs sold (in shares)		500,000		1,800,000
Sales price		$ 46.6		$ 164.1
Sale of equity investments, settled				19.9
ODATA investments
Schedule of Equity Method Investments [Line Items]
Cost method			$ 30.3	$ 22.9

Equity Investments - Unrealized

Equity Investments - Unrealized Gain (Loss) on Marketable Equity Investment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gain on marketable equity investment	$ 2.4	$ 89.5	$ 132.3
Less: Gain recognized on marketable equity investment sold	2.4	69.6	66.7
Unrealized gain on marketable equity investment	$ 0	$ 19.9	$ 65.6

Goodwill, Intangible and Othe_3

Goodwill, Intangible and Other Long-Lived Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 455,100,000	$ 455,100,000
Impairment of goodwill	0	0	$ 0
Impairment of intangible assets	0	0	0
Amortization expense for acquired intangible assets	$ 31,600,000	$ 38,900,000	$ 39,900,000

Goodwill, Intangible and Othe_4

Goodwill, Intangible and Other Long-Lived Assets - Carrying Value of Major Classes of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 404.9	$ 407.1
Accumulated Amortization	(280.1)	(249.3)
Total	$ 124.8	157.8
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average  Remaining Life (in years)	8 years
Gross Carrying Amount	$ 247.1	247.1
Accumulated Amortization	(174.2)	(163.1)
Total	$ 72.9	84
Trademark/tradename
Finite-Lived Intangible Assets [Line Items]
Weighted- Average  Remaining Life (in years)	3 years
Gross Carrying Amount	$ 11.5	11.6
Accumulated Amortization	(9.8)	(9)
Total	$ 1.7	2.6
Favorable leasehold interest
Finite-Lived Intangible Assets [Line Items]
Weighted- Average  Remaining Life (in years)	38 years
Gross Carrying Amount	$ 5.7	5.7
Accumulated Amortization	(2.1)	(1.6)
Total	$ 3.6	4.1
In-place customer leases
Finite-Lived Intangible Assets [Line Items]
Weighted- Average  Remaining Life (in years)	3 years
Gross Carrying Amount	$ 138.3	140.4
Accumulated Amortization	(92.8)	(74.6)
Total	$ 45.5	65.8
Above and below market leases
Finite-Lived Intangible Assets [Line Items]
Weighted- Average  Remaining Life (in years)	4 years
Gross Carrying Amount	$ 2.3	2.3
Accumulated Amortization	(1.2)	(1)
Total	$ 1.1	$ 1.3

Goodwill, Intangible and Othe_5

Goodwill, Intangible and Other Long-Lived Assets - Estimated Amortization Expense For Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
2022	$ 29.2
2023	20.3
2024	18.6
2025	17.3
2026	9.3
Thereafter	30.1
Total	$ 124.8	$ 157.8

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits for contract obligations	$ 193.4	$ 0
Deferred leasing and other contract costs	87	62.4
Prepaid expenses	19.8	19.1
Non-real estate assets, net	12.3	13.8
Other assets	39.7	38.1
Total	352.2	$ 133.4
Deposit, fixed price equipment purchase	$ 193.4

Debt - Components of Debt (Deta

Debt - Components of Debt (Details) € in Millions	Sep. 21, 2020USD ($)	Jan. 22, 2020EUR (€)	Dec. 31, 2021EUR (€)extension	Dec. 31, 2021USD ($)	Dec. 31, 2021EUR (€)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)
Debt Instrument [Line Items]
Deferred financing costs				$ (27,800,000)		$ (29,500,000)
Total				$ 3,492,900,000		3,409,000,000
LIBOR | USD
Debt Instrument [Line Items]
Interest rate				0.11%	0.11%
Term Loan | LIBOR | 2023 Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%
Term Loan | LIBOR | 2025 Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%
Senior Notes | 2024 Notes, including bond discount of $0.6 million and $0.7 million, respectively
Debt Instrument [Line Items]
Long-term debt, gross						599,300,000
Interest rate				2.90%	2.90%
Bond discount (premium)				$ 600,000		700,000
Senior Notes | 2024 Notes, including bond discount of $0.6 million and $0.7 million, respectively | Carrying Value
Debt Instrument [Line Items]
Long-term debt, gross				$ 599,400,000		599,300,000
Senior Notes | 2027 Notes, including bond discount of $0.6 million and $0.6 million, respectively(d)
Debt Instrument [Line Items]
Long-term debt, gross						612,600,000
Interest rate		1.45%		1.45%	1.45%
Bond discount (premium)				$ 600,000	€ 0.7	600,000
Proceeds from debt | €		€ 495.3	€ 495.3
Senior Notes | 2027 Notes, including bond discount of $0.6 million and $0.6 million, respectively(d) | Carrying Value
Debt Instrument [Line Items]
Long-term debt, gross				$ 566,600,000		612,600,000
Senior Notes | 2028 Notes, including bond discount of $6.9 million
Debt Instrument [Line Items]
Long-term debt, gross						0
Interest rate				1.125%	1.125%
Bond discount (premium)				$ 6,900,000	€ 6.7
Proceeds from debt | €			€ 489.2
Senior Notes | 2028 Notes, including bond discount of $6.9 million | Carrying Value
Debt Instrument [Line Items]
Long-term debt, gross				$ 560,300,000		0
Senior Notes | 2029 Notes, including bond discount of $1.4 million and $1.6 million, respectively
Debt Instrument [Line Items]
Long-term debt, gross						598,400,000
Interest rate				3.45%	3.45%
Bond discount (premium)				$ 1,400,000		1,600,000
Senior Notes | 2029 Notes, including bond discount of $1.4 million and $1.6 million, respectively | Carrying Value
Debt Instrument [Line Items]
Long-term debt, gross				$ 598,600,000		598,400,000
Senior Notes | 2030 Notes, including bond discount of $4.2 million and $4.7 million, respectively
Debt Instrument [Line Items]
Interest rate	2.15%			2.15%	2.15%
Bond discount (premium)				$ 4,200,000		4,700,000
Proceeds from debt	$ 392,600,000
Senior Notes | 2030 Notes, including bond discount of $4.2 million and $4.7 million, respectively | Carrying Value
Debt Instrument [Line Items]
Long-term debt, gross				395,800,000		395,300,000
Revolving Credit Facility
Debt Instrument [Line Items]
Option to extend maturity of debt, period			1 year
Revolving Credit Facility | Fair Value
Debt Instrument [Line Items]
Long-term debt, gross				0		432,900,000
Revolving Credit Facility | Carrying Value
Debt Instrument [Line Items]
Long-term debt, gross				0		432,900,000
Revolving Credit Facility | 1.4 Billion Senior Multi Currency Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings on line of credit				0
Option to extend maturity of debt, period			12 months
Number of extension options | extension			1
Revolving Credit Facility | $3 Billion Credit Facility
Debt Instrument [Line Items]
Borrowings on line of credit							$ 1,300,000,000
Revolving Credit Facility | EUR Revolver
Debt Instrument [Line Items]
Borrowings on line of credit				0		275,900,000
Revolving Credit Facility | GBP Revolver
Debt Instrument [Line Items]
Borrowings on line of credit				0		157,000,000
Revolving Credit Facility | 2023 Term Loan Facility
Debt Instrument [Line Items]
Option to extend maturity of debt, period			1 year
Number of extension options | extension			2
Revolving Credit Facility | 2023 Term Loan Facility | Fair Value
Debt Instrument [Line Items]
Borrowings on line of credit				100,000,000		100,000,000
Revolving Credit Facility | 2023 Term Loan Facility | Carrying Value
Debt Instrument [Line Items]
Borrowings on line of credit				100,000,000		100,000,000
Revolving Credit Facility | 2025 Term Loan Facility | Fair Value
Debt Instrument [Line Items]
Borrowings on line of credit				700,000,000		700,000,000
Revolving Credit Facility | 2025 Term Loan Facility | Carrying Value
Debt Instrument [Line Items]
Borrowings on line of credit				$ 700,000,000		$ 700,000,000
Revolving Credit Facility | EURIBOR | 1.4 Billion EUR Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Revolving Credit Facility | GPB LIBOR | 1.4 Billion GBP Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%

Debt - Credit Facilities (Detai

Debt - Credit Facilities (Details)	Mar. 31, 2020USD ($)	Mar. 29, 2018USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2021USD ($)extension	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Line of Credit Facility [Line Items]
Gain (loss) on early extinguishment of debt				$ 0	$ (6,500,000)	$ (71,800,000)
Outstanding letters of credit				$ 8,400,000
2023 Term Loan
Line of Credit Facility [Line Items]
Debt instrument, term		5 years
2023 Term Loan | Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 1,000,000,000
Number of extension options | extension				2
Option to extend maturity				1 year
2025 Term Loan
Line of Credit Facility [Line Items]
Debt instrument, term		7 years
2025 Term Loan | Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 300,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Option to extend maturity				1 year
Revolving Credit Facility | $3 Billion Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		3,000,000,000
Repayments of long-term debt	$ 1,300,000,000
Line of credit	$ 1,300,000,000		$ 1,300,000,000
Gain (loss) on early extinguishment of debt			$ (3,400,000)
Remaining borrowing capacity				$ 1,400,000,000
Revolving Credit Facility | $1.7 Billion Revolving Credit Facility:
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,700,000,000
Multicurrency borrowing sublimit		$ 750,000,000
Commitment fee upon greater utilization (as a percent)				0.20%
Revolving Credit Facility | 1.4 Billion Senior Multi Currency Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 1,400,000,000
Additional maximum borrowing capacity				4,000,000,000
Multicurrency borrowing sublimit				$ 750,000,000
Number of extension options | extension				1
Option to extend maturity				12 months
Line of credit				$ 0
Revolving Credit Facility | 2023 Term Loan Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 400,000,000
Number of extension options | extension				2
Option to extend maturity				1 year
Revolving Credit Facility | 2025 Term Loan Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 700,000,000
Revolving Credit Facility | Second Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Facility fee				$ 2,800,000	$ 2,900,000	$ 2,600,000

Debt - Senior Notes (Details)

Debt - Senior Notes (Details)	Sep. 21, 2020USD ($)	Jan. 22, 2020EUR (€)	Dec. 05, 2019USD ($)	Dec. 31, 2021EUR (€)	May 26, 2021EUR (€)	Mar. 29, 2018USD ($)
1.4 Billion US Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from sale of GDS shares used to pay down term loan	$ 20,000,000
$3 Billion Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 3,000,000,000
Senior Notes | 2028 Notes, including bond discount of $6.9 million
Debt Instrument [Line Items]
Debt principal amount | €					€ 500,000,000
Interest rate				1.125%
Proceeds from debt | €				€ 489,200,000
Proceeds from (Repayments of) Debt | €				€ 490,800,000
Senior Notes | 1.450% Senior Notes due 2027
Debt Instrument [Line Items]
Debt principal amount | €		€ 500,000,000
Interest rate		1.45%		1.45%
Proceeds from debt | €		€ 495,300,000		€ 495,300,000
Senior Notes | 2.150% Senior Notes due 2030
Debt Instrument [Line Items]
Debt principal amount	$ 400,000,000
Interest rate	2.15%			2.15%
Proceeds from debt	$ 392,600,000
Senior Notes | 2.900% Senior Notes Due 2024
Debt Instrument [Line Items]
Interest rate				2.90%
Senior Notes | 2.900% Senior Notes Due 2024 | CyrusOne LP and CyrusOne Finance Corp
Debt Instrument [Line Items]
Debt principal amount			$ 600,000,000
Interest rate			2.90%
Senior Notes | 3.450% Senior Notes Due 2029
Debt Instrument [Line Items]
Interest rate				3.45%
Senior Notes | 3.450% Senior Notes Due 2029 | CyrusOne LP and CyrusOne Finance Corp
Debt Instrument [Line Items]
Debt principal amount			$ 600,000,000
Interest rate			3.45%
Senior Notes | 2.900% Senior Notes Due 2024 and 3.450% Senior Notes Due 2029
Debt Instrument [Line Items]
Debt proceeds, net of underwriting costs			$ 1,197,400,000
Senior Notes | 2024 Notes
Debt Instrument [Line Items]
Interest rate			5.00%
Senior Notes | 5.375% Senior Notes Due 2027
Debt Instrument [Line Items]
Interest rate			5.375%
Senior Notes | 5.000% Senior Notes Due 2024 and 5.375% Senior Notes Due 2027
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 71,800,000
Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate					1.125%
Term Loan | 2023 Term Loan
Debt Instrument [Line Items]
Proceeds from sale of GDS shares used to pay down term loan	300,000,000
Loss on early extinguishment of debt	$ 3,100,000
Maximum borrowing capacity						$ 1,000,000,000

Debt - Maturities of Debt (Deta

Debt - Maturities of Debt (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)extension
Debt Instrument [Line Items]
2022	$ 0
2023	100
2024	600
2025	700
2026	0
Thereafter	2,134.4
Total debt	$ 3,534.4
Revolving Credit Facility
Debt Instrument [Line Items]
Option to extend maturity of debt, period	1 year
Amended Credit Agreement
Debt Instrument [Line Items]
2022	$ 0
2023	100
2024	0
2025	700
2026	0
Thereafter	0
Total debt	800
Senior Notes
Debt Instrument [Line Items]
2022	0
2023	0
2024	600
2025	0
2026	0
Thereafter	2,134.4
Total debt	$ 2,734.4
Term Loan | 2023 Term Loan
Debt Instrument [Line Items]
Option to extend maturity of debt, period	1 year
Number of extension options | extension	2

Fair Value of Financial Instr_3

Fair Value of Financial Instruments and Hedging Activities - Carrying Value and Fair Value of Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Sep. 21, 2020	Jan. 22, 2020	Oct. 18, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	$ 15.9	$ 59.2
Equity investments	30.3	67.1
Carrying Value | Currency Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability		52.2
Carrying Value | Interest Rate Swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability		7
Carrying Value | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	0	432.9
Fair Value | Currency Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	13.5	52.2
Fair Value | Interest Rate Swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability		7
Fair Value | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	0	432.9
2023 Term Loan Facility | Carrying Value | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings on line of credit	100	100
2023 Term Loan Facility | Fair Value | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings on line of credit	100	100
2025 Term Loan Facility | Carrying Value | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings on line of credit	700	700
2025 Term Loan Facility | Fair Value | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings on line of credit	$ 700	700
Senior Notes | 2.900% Senior Notes Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross		599.3
Interest rate	2.90%
Senior Notes | 2.900% Senior Notes Due 2024 | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	$ 599.4	599.3
Senior Notes | 1.450% Senior Notes due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross		612.6
Interest rate	1.45%			1.45%
Senior Notes | 1.450% Senior Notes due 2027 | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	$ 566.6	612.6
Senior Notes | 1.125% Senior Notes due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross		0
Interest rate	1.125%
Senior Notes | 1.125% Senior Notes due 2028 | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	$ 560.3	0
Senior Notes | 3.450% Senior Notes Due 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross		598.4
Interest rate	3.45%
Senior Notes | 3.450% Senior Notes Due 2029 | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	$ 598.6	598.4
Senior Notes | 2.150% Senior Notes due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	2.15%		2.15%
Senior Notes | 2.150% Senior Notes due 2030 | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	$ 395.8	395.3
Level 1 | Senior Notes | 2.900% Senior Notes Due 2024 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	620.3	640.7
Level 1 | Senior Notes | 1.450% Senior Notes due 2027 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	577.3	619.9
Level 1 | Senior Notes | 1.125% Senior Notes due 2028 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	565.5	0
Level 1 | Senior Notes | 3.450% Senior Notes Due 2029 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	653.2	644.1
Level 1 | Senior Notes | 2.150% Senior Notes due 2030 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	395.7	388.6
GDS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investments	0	44.2			$ 100
GDS | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investments	0	44.2
GDS | Level 2 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investments	$ 0	$ 44.2

Fair Value of Financial Instr_4

Fair Value of Financial Instruments and Hedging Activities - Narrative (Details) € in Millions, $ in Millions	Sep. 21, 2020USD ($)	Dec. 31, 2021USD ($)instrument	Dec. 31, 2020USD ($)	Dec. 31, 2021EUR (€)instrument	Sep. 03, 2019USD ($)
Debt Instrument [Line Items]
Impairment losses and (gain) loss on asset disposals, net		$ 0.5	$ 11.2
Derivative liabilities		15.9	59.2
Asset		0	0
Term Loan | 2023 Term Loan Facility
Debt Instrument [Line Items]
Proceeds from sale of GDS shares used to pay down term loan	$ 300
Cross-Currency Swaps | Other Liabilities
Debt Instrument [Line Items]
Derivative liabilities		13.5	52.2
Interest Rate Swaps | Term Loan
Debt Instrument [Line Items]
Derivative liability, notional amount					$ 300
Fixed interest rate					1.19%
Interest Rate Swaps | Other Liabilities
Debt Instrument [Line Items]
Derivative liabilities		$ 2.4	$ 7
Maturing March 2023 | Cross-Currency Swaps
Debt Instrument [Line Items]
Number of derivative instruments | instrument		2		2
Derivative asset, notional amount		$ 500
Derivative liability, notional amount | €				€ 450.7
Gain (loss) recognized in earnings		$ 4.5

Fair Value of Financial Instr_5

Fair Value of Financial Instruments and Hedging Activities - Derivative Positions (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount
Asset	0	$ 0
Liability	15.9	59.2
3/29/2023 | Net investment hedge | Cross Currency Swaps | Designated derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	250
Asset	0	0
Liability	6.7	26
3/29/2023 | Net investment hedge | Cross Currency Swaps | Designated derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	250
Asset	0	0
Liability	6.8	26.2
3/29/2023 | Interest rate hedge - Float to fixed | Interest Rate Swaps | Designated derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	300
Asset	0	0
Liability	$ 2.4	$ 7

Fair Value of Financial Instr_6

Fair Value of Financial Instruments and Hedging Activities - Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Amount of gain (loss) recognized in OCI for derivatives	$ 43.4	$ (53)	$ (0.7)
Cross-Currency Swaps
Derivative [Line Items]
Amount of gain (loss) recognized in OCI for derivatives	43.4	(53)
Amount of gain (loss) reclassified from Accumulated OCI for derivatives	(3.3)	$ (1.7)
Expected reclassification from Accumulated OCI to Net Income	$ 3.4

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Health care plan expenses	$ 4.3	$ 3.3	$ 3.9
Retirement savings plan matching contributions	$ 2.3	$ 2	$ 1.9

Income per Share - Computation

Income per Share - Computation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income (loss)	$ 25.3	$ 41.4	$ 41.4
Less: Restricted stock dividends, Basic	(0.4)	(0.5)	(0.7)
Less: Restricted stock dividends, Diluted	(0.4)	(0.5)	(0.7)
Net income (loss) available to stockholders, Basic	24.9	40.9	40.7
Net (loss) income available to stockholders, Diluted	$ 24.9	$ 40.9	$ 40.7
Denominator:
Weighted average common outstanding - basic (in shares)	123.8	117.3	112.1
Performance-based restricted stock and units (in shares)	0.1	0.3	0.4
Weighted average shares outstanding- diluted (in shares)	123.9	117.6	112.5
EPS:
Net income (loss) per share-basic (in dollars per share)	$ 0.20	$ 0.35	$ 0.36
Effect of dilutive shares:
Net income (loss) per share-diluted (in dollars per share)	$ 0.20	$ 0.35	$ 0.36

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from sale of stock	$ 597,700,000	$ 325,700,000	$ 357,200,000
Common stock outstanding (in shares)	129,554,609	120,442,521
Dividends payable	$ 68,100,000	$ 63,300,000	$ 58,600,000
New 2018 ATM Stock Offering Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares authorized				$ 750,000,000
2020 ATM Stock Offering Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares authorized	750,000,000
2021 ATM Stock Offering Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares authorized	750,000,000
Value of shares available to grant	$ 513,400,000
Forward Offering Settlement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forward offering settlement (in shares)	8,400,000	5,000,000
Price per share (in dollars per share)	$ 70.84	$ 63.61
Proceeds from settlement of forward equity sale agreement	$ 593,700,000	$ 315,600,000
Forward sale agreement with Jefferies LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forward offering settlement (in shares)	0
Proceeds from settlement of forward equity sale agreement	$ 0
Sale of stock, number of shares (in shares)	1,400,000	6,800,000
Forward sale agreement with Jefferies LLC | New 2018 ATM Stock Offering Program And 2020 ATM Stock Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price per share (in dollars per share)		$ 68.98
Sale of stock, number of shares (in shares)		10,200,000
Issuance of common stock (in shares)		3,400,000
Sale of stock, consideration received on transaction		$ 219,100,000
Forward sale agreement with Jefferies LLC | 2021 ATM Stock Offering Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, number of shares (in shares)	3,000,000
Issuance of common stock (in shares)	1,600,000
Sale of stock, consideration received on transaction	$ 116,600,000

Stockholders' Equity - Forward

Stockholders' Equity - Forward Sale of Equity (Details) - Forward sale agreement with Jefferies LLC shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)shares
Forward Sale Of Equity Of Common Stock [Roll Forward]
Beginning balance (in shares) | shares	6.8
Forward offering settlement (in shares) | shares	0
Ending balance (in shares) | shares	1.4
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Net proceeds received, beginning balance	$ 0
Proceeds from settlement of forward equity sale agreement	0
Net proceeds received, ending balance	593.7
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, beginning balance	484.7
Remaining proceeds available, settlements	(7.6)
Remaining proceeds available, ending balance	113.3
Estimated proceeds, net of adjustments	$ 113.3
May 2020 Forward Offering settlement
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering settlement (in shares) | shares	(1.4)
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement	$ 95.3
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, settlements	$ (95.3)
May 2020 Forward Offering settlement
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering settlement (in shares) | shares	(1.3)
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement	$ 95.5
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, settlements	$ (95.5)
May 2021 Forward Offering - Sales
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering sales (in shares) | shares	0.3
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, additions	$ 22.5
June 2021 Forward Offering - Sales
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering sales (in shares) | shares	1.6
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, additions	$ 116.6
June 2021 Forward Offering - Sales
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering sales (in shares) | shares	1.1
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, additions	$ 90.8
September 2020 Forward Offering settlement
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering settlement (in shares) | shares	(1.4)
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement	$ 100.5
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, settlements	$ (100.5)
September 2020 Forward Offering settlement
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering settlement (in shares) | shares	(1.6)
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement	$ 112.5
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, settlements	$ (112.5)
November 2020 Forward Offering settlement
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering settlement (in shares) | shares	(1.1)
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement	$ 73.3
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, settlements	$ (73.3)
June 2021 Forward Offering settlement
Forward Sale Of Equity Of Common Stock [Roll Forward]
Forward offering settlement (in shares) | shares	(1.6)
Forward Sales Of Equity Of Common Stock, Net Proceeds Received [Roll Forward]
Proceeds from settlement of forward equity sale agreement	$ 116.6
Forward Sales Of Equity Of Common Stock, Remaining Expected Proceeds Available [Roll Forward]
Remaining proceeds available, settlements	$ (116.6)

Stockholders' Equity - Declared

Stockholders' Equity - Declared Cash Dividends and Distributions (Details) - $ / shares	Jan. 07, 2022	Oct. 08, 2021	Jul. 09, 2021	Apr. 09, 2021	Jan. 08, 2021	Oct. 09, 2020	Jul. 10, 2020	Apr. 09, 2020
Class of Stock [Line Items]
Declared cash dividends and distributions (in dollars per share)		$ 0.52	$ 0.51	$ 0.51	$ 0.51	$ 0.51	$ 0.50	$ 0.50
Subsequent Event
Class of Stock [Line Items]
Declared cash dividends and distributions (in dollars per share)	$ 0.52

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)

Jan. 29, 2022

Dec. 29, 2021

Aug. 11, 2021

May 18, 2021

Feb. 18, 2021

Apr. 30, 2020

Feb. 25, 2020

Feb. 21, 2019

Feb. 26, 2018

Feb. 13, 2017

Feb. 01, 2016

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of options (in dollars per share)

$ 0

Total intrinsic value of options exercised

$ 4,200,000

$ 10,500,000

$ 400,000

Aggregate intrinsic value of options outstanding and exercisable

200,000

2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value

$ 22,600,000

Unearned compensation related to awards granted

$ 0

2017 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Cap on vesting (as a percent)

100.00%

Grant date fair value

$ 15,900,000

2018 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value

$ 20,200,000

2019 Grants and ESPP expense

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value

$ 20,500,000

Unearned compensation related to awards granted

$ 200,000

Weighted average vesting period

1 month 6 days

2020 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value

$ 30,100,000

Unearned compensation related to awards granted

$ 2,100,000

Weighted average vesting period

8 months 12 days

2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value

$ 22,700,000

Unearned compensation related to awards granted

$ 9,100,000

Weighted average vesting period

1 year 9 months 18 days

Market-based awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period when vesting is limited to 100%

2 years

Vesting period

3 years

Market-based awards | Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

REIT index causing awards to vest (as a percent)

2.00%

Market-based awards | Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

REIT index causing awards to vest (as a percent)

200.00%

Market-based awards | If CyrusOne's total stockholder return is less than the return of the Index

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting rights (as a percent)

0.00%

Market-based awards | If CyrusOne's total stockholder return is equal to or greater than the return of the Index

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting rights (as a percent)

100.00%

Market-based awards | if CyrusOne's total stockholder return exceeds the return of the Index by 2%

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting rights (as a percent)

200.00%

Market-based awards | If CyrusOne's total stockholder return exceeds the return of the Index, but is negative

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting rights (as a percent)

50.00%

Market-based awards | 2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of non-option awards (in dollars per share)

$ 43.66

Market-based awards | 2017 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

129,146

Grant date fair value of non-option awards (in dollars per share)

$ 63.23

Market-based awards | 2018 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

160,266

Grant date fair value of non-option awards (in dollars per share)

$ 52.53

Market-based awards | 2019 Grants and ESPP expense

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

184,145

Grant date fair value of non-option awards (in dollars per share)

$ 43.67

Market-based awards | 2020 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

57,557

45,241

Grant date fair value of non-option awards (in dollars per share)

$ 107.94

$ 144.79

Market-based awards | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vested (in shares)

89,113

Grant date fair value of non-option awards (in dollars per share)

$ 94.95

Time-based restricted stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Term of right to receive dividends payable

10 days

Time-based restricted stock units | 2016 Grants | Cliff Vesting

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period

3 years

Time-based restricted stock units | 2017 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

119,218

20,852

Vesting period

3 years

3 years

Time-based restricted stock units | 2018 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

161,797

40,249

Vesting period

3 years

3 years

Time-based restricted stock units | 2019 Grants and ESPP expense

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

175,073

42,052

Vesting period

3 years

3 years

Time-based restricted stock units | 2020 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

14,973

118,974

1,226

Grant date fair value of non-option awards (in dollars per share)

$ 70.15

$ 66.42

$ 72.64

Vesting period

1 year

3 years

3 years

Time-based restricted stock units | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

10,185

1,835

Vesting period

3 years

3 years

Time-based restricted stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

119,323

Grant date fair value of non-option awards (in dollars per share)

$ 74.10

Time-based restricted stock | 2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

47,667

Vesting period

3 years

3 years

Time-based restricted stock | 2016 Grants | Cliff Vesting

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

5,894

Vesting period

3 years

Time-based restricted stock | 2017 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

18,179

Vesting period

1 year

Time-based restricted stock | 2018 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

17,052

Vesting period

1 year

Time-based restricted stock | 2019 Grants and ESPP expense

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

16,681

Vesting period

1 year

Time-based restricted stock | 2020 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

103,260

Grant date fair value of non-option awards (in dollars per share)

$ 73.98

Vesting period

3 years

Time-based restricted stock | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting rights (as a percent)

83.33%

Granted (in shares)

33,459

Grant date fair value of non-option awards (in dollars per share)

$ 74.67

Time-based restricted stock | 2021 Grants | Subsequent Event

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting rights (as a percent)

16.67%

Stock options | 2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

222,461

Contractual life

10 years

Exercise price (in dollars per share)

$ 36.99

Grant date fair value of options (in dollars per share)

$ 6.99

Performance-based and market-based awards | 2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period when vesting is limited to 100%

2 years

Cap on vesting (as a percent)

100.00%

Vesting period

3 years

Cumulative true-up maximum (as a percent)

200.00%

Time-based restricted stock units and restricted stock | 2017 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of non-option awards (in dollars per share)

$ 48.13

Time-based restricted stock units and restricted stock | 2018 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of non-option awards (in dollars per share)

$ 51.31

Time-based restricted stock units and restricted stock | 2019 Grants and ESPP expense

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of non-option awards (in dollars per share)

$ 52.46

Time-based restricted stock units and restricted stock | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of non-option awards (in dollars per share)

$ 73.64

$ 96.43

Vesting period

1 year

Time, performance and market-based awards | 2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

641,097

Time, performance and market-based awards | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vested (in shares)

12,285

Time and performance-based awards | 2016 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value of non-option awards (in dollars per share)

$ 36.99

Restricted stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

20,222

Grant date fair value of non-option awards (in dollars per share)

$ 69.92

Restricted stock units | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

18,387

Grant date fair value of non-option awards (in dollars per share)

$ 69.52

LTIP Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

149,061

Grant date fair value of non-option awards (in dollars per share)

$ 83.15

LTIP Units | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

5,704

54,244

Grant date fair value of non-option awards (in dollars per share)

$ 64.52

Time-Based Restricted Stock | 2021 Grants

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in shares)

63,394

Grant date fair value of non-option awards (in dollars per share)

$ 69.52

LTIP

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares reserved for issuance

8,900,000

Number of shares available for grant

4,200,000

Stock-Based Compensation - Comp

Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	$ 22.6	$ 18.4	$ 16.7
2016 Grants
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	0	0	1.1
2017 Grants
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	0	0.5	3.1
2018 Grants
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	0.7	3.9	5.4
2019 Grants and ESPP expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	2	5.5	7.1
2020 Grants and ESPP expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	10.9	8.5	0
2021 Grants and ESPP expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation expense	$ 9	$ 0	$ 0

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Awards Activity (Details)	12 Months Ended
	Dec. 31, 2021$ / sharesshares
Restricted Stock Units
Shares
Non-vested beginning balance (in shares)	484,890
Granted (in shares)	20,222
TSR and other adjustments (in shares)	186,239
Exercised (in shares)	(431,074)
Forfeited (in shares)	(40,131)
Non-vested ending balance (in shares)	220,146
Weighted Average Grant Date Fair Value
Non-vested beginning balance (in dollars per share) | $ / shares	$ 66.66
Granted (in dollars per share) | $ / shares	69.92
TSR and other adjustments (in dollars per share) | $ / shares	$ 86.98
Exercised (in dollars per share)	62.68
Forfeited (in dollars per share) | $ / shares	$ 119.30
Non-vested ending balance (in dollars per share) | $ / shares	$ 82.33
TSR performance metric, payout percent	200.00%
Restricted Stock
Shares
Non-vested beginning balance (in shares)	118,233
Granted (in shares)	119,323
Exercised (in shares)	(150,353)
Forfeited (in shares)	(9,163)
Non-vested ending balance (in shares)	78,040
Weighted Average Grant Date Fair Value
Non-vested beginning balance (in dollars per share) | $ / shares	$ 74.12
Granted (in dollars per share) | $ / shares	$ 74.10
Exercised (in dollars per share)	74.17
Forfeited (in dollars per share) | $ / shares	$ 72.25
Non-vested ending balance (in dollars per share) | $ / shares	$ 74.21
LTIP Units
Shares
Non-vested beginning balance (in shares)	0
Granted (in shares)	149,061
Exercised (in shares)	0
Forfeited (in shares)	(53,770)
Non-vested ending balance (in shares)	95,291
Weighted Average Grant Date Fair Value
Non-vested beginning balance (in dollars per share) | $ / shares	$ 0
Granted (in dollars per share) | $ / shares	$ 83.15
Exercised (in dollars per share)	0
Forfeited (in dollars per share) | $ / shares	$ 87.08
Non-vested ending balance (in dollars per share) | $ / shares	$ 80.93

Stock-Based Compensation - Unve

Stock-Based Compensation - Unvested Stock Options (Details)	12 Months Ended
	Dec. 31, 2021$ / sharesshares
Options
Beginning balance (in shares) | shares	97,801
Granted (in shares) | shares	0
Exercised (in shares) | shares	(95,196)
Forfeited or expired (in shares) | shares	0
Ending balance (in shares) | shares	2,605
Exercisable (in shares) | shares	2,605
Vested and expected to vest (in shares) | shares	2,605
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 30.87
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	31.07
Forfeited or expired (in dollars per share) | $ / shares	0
Ending balance (in dollars per share) | $ / shares	23.58
Exercisable (in dollars per share) | $ / shares	23.58
Vested and expected to vest (in dollars per share) | $ / shares	$ 23.58

Stock-Based Compensation - Opti

Stock-Based Compensation - Option Valuation Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)	2,605	97,801
Options Exercisable, Number of Shares (in shares)	2,605
23.58
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices (in dollars per share)	$ 23.58	$ 23.58	$ 23.58
Options Outstanding, Number of Shares (in shares)	2,605	16,930	51,985
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)	9 months 18 days	10 months 24 days	3 years 3 months 18 days
Options Exercisable, Number of Shares (in shares)	2,605	16,930	51,985
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)	9 months 18 days	10 months 24 days	3 years 3 months 18 days
Risk-Free Interest Rate (as a percent)	0.92%	0.92%	0.92%
Expected Annual Dividend Yield (as a percent)	3.40%	3.40%	3.40%
Expected Terms in Years	6 years	6 years	6 years
Expected Volatility (as a percent)	35.00%	35.00%	35.00%
28.42
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices (in dollars per share)		$ 28.42	$ 28.42
Options Outstanding, Number of Shares (in shares)		43,317	143,358
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)		7 months 6 days	5 years 1 month 6 days
Options Exercisable, Number of Shares (in shares)		43,317	143,358
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)		7 months 6 days	5 years 1 month 6 days
Expected Annual Dividend Yield (as a percent)		4.40%	4.40%
30.74
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices (in dollars per share)			$ 30.74
Options Outstanding, Number of Shares (in shares)			12,719
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)			5 years 7 months 6 days
Options Exercisable, Number of Shares (in shares)			12,719
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)			5 years 7 months 6 days
Expected Annual Dividend Yield (as a percent)			4.40%
36.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices (in dollars per share)		$ 36.99	$ 36.99
Options Outstanding, Number of Shares (in shares)		37,554	167,024
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)		7 months 6 days	6 years 1 month 6 days
Options Exercisable, Number of Shares (in shares)		37,554	167,024
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)		7 months 6 days	6 years 1 month 6 days
Expected Annual Dividend Yield (as a percent)		4.10%	4.10%
Minimum | 28.42
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate (as a percent)		1.60%	1.60%
Expected Terms in Years		5 years 6 months	5 years 6 months
Expected Volatility (as a percent)		0.325%	32.50%
Minimum | 30.74
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate (as a percent)			1.60%
Expected Terms in Years			5 years 6 months
Expected Volatility (as a percent)			0.325%
Minimum | 36.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate (as a percent)		1.47%	1.47%
Expected Terms in Years		5 years 6 months	5 years 6 months
Expected Volatility (as a percent)			0.275%
Maximum | 28.42
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate (as a percent)		1.75%	1.75%
Expected Terms in Years		6 years 6 months	6 years 6 months
Expected Volatility (as a percent)		0.375%	0.375%
Maximum | 30.74
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate (as a percent)			1.75%
Expected Terms in Years			6 years 6 months
Expected Volatility (as a percent)			0.375%
Maximum | 36.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate (as a percent)		1.64%	1.64%
Expected Terms in Years		6 years 6 months	6 years 6 months
Expected Volatility (as a percent)			0.35%

Income Taxes - Component of Inc

Income Taxes - Component of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
Federal	$ 1.9	$ 1.5	$ 1.7
State	2.2	2	1.9
Foreign	0.5	5	0.2
Total current expense	4.6	8.5	3.8
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	(9.5)	(12.1)	(7.5)
Total deferred benefit	(9.5)	(12.1)	(7.5)
Income tax benefit	$ (4.9)	$ (3.6)	$ (3.7)

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax at U.S. federal statutory income tax rate	$ 4.3	$ 3.9	$ 7.9
State and local taxes, net of federal income tax benefit	2.2	1.6	1.7
Impact of REIT status	(16.9)	(18.2)	(13.7)
Permanent differences	0	0.1	(0.7)
Foreign tax rate and currency differences	(1.6)	(2.7)	(1)
Anti-hybrid disallowances	1.9	2.4	1.6
Deferred tax true ups and other	4.6	1	0
Unrecognized tax benefits	0.5	5	0
Valuation allowance	0.1	3.3	0.5
Income tax benefit	$ (4.9)	$ (3.6)	$ (3.7)

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Net operating loss carryforwards	$ 18.9	$ 19.7
Accounts receivable/payable and other	8.7	9.1
Disallowed interest and other expenses	4.9	3.4
Finance leases	1.9	1.6
Total gross deferred tax assets	34.4	33.8
Valuation allowance	(12.6)	(12.2)
Total gross deferred tax assets, net	21.8	21.6
Deferred tax liabilities
Deferred rent and other	(8.6)	(1.9)
Fixed assets	(50.1)	(67.5)
Intangibles	(2.9)	(5.2)
Total gross deferred tax liabilities	(61.6)	(74.6)
Total net deferred tax liabilities	$ (39.8)	$ (53)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Valuation allowance	$ 12.6	$ 12.2
Accrued interest and penalties	$ 0.5

Income Taxes (Schedule of Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 5	$ 0	$ 0
Additions related to acquisitions	0	0	0
Additions for tax positions for the current year	0	5	0
Additions for tax positions of prior years	0	0	0
Reductions for tax positions of prior years	0	0	0
Settlements	0	0	0
Ending balance	$ 5	$ 5	$ 0

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Outstanding letters of credit	$ 8,400,000
Data Center Facilities and Equipment
Loss Contingencies [Line Items]
Commitments expected to be incurred	$ 287,200,000
Data Center Facilities and Equipment | Minimum
Loss Contingencies [Line Items]
Commitment term	1 year
Data Center Facilities and Equipment | Maximum
Loss Contingencies [Line Items]
Commitment term	2 years
Services
Loss Contingencies [Line Items]
Commitments expected to be incurred	$ 353,300,000
Services | Minimum
Loss Contingencies [Line Items]
Commitment term	1 year
Services | Maximum
Loss Contingencies [Line Items]
Commitment term	7 years
Performance Guarantee
Loss Contingencies [Line Items]
Accruals for performance guarantees	$ 900,000	$ 3,500,000	$ 0

Subsequent Event new (Details)

Subsequent Event new (Details) $ in Millions	Jan. 14, 2022USD ($)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Houston West I, II, and III and Houston Galleria | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 670

Schedule II. Valuation and Qu_2

Schedule II. Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period	$ 3.5	$ 1.8	$ 1.7
Charge to Expenses	(1.5)	1.7	1.7
(Deductions)/Additions	(0.6)	0	(1.6)
End of Period	1.4	3.5	1.8
Deferred Tax Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period	12.2	7.6	6.9
Charge to Expenses	0.4	4.6	0.7
(Deductions)/Additions	0	0	0
End of Period	$ 12.6	$ 12.2	$ 7.6

Schedule III. Real Estate Pro_2

Schedule III. Real Estate Properties and Accumulated Depreciation - Schedule of Real Estate Properties (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Initial Costs
Land	$ 208.7
Building and Improvements	634.3
Equipment	648.9
Cost Capitalized Subsequent to Acquisition
Land	1.8
Building and Improvements	1,709.7
Equipment	3,491.4
Gross Carrying Amount
Land	210.5
Building and Improvements	2,344
Equipment	4,140.3
Accumulated Depreciation	2,184.1	$ 1,767.9	$ 1,379.2	$ 1,054.5
Inventory, Land Held for Development and Sale	301.3
Aggregate cost of the total properties for federal income tax purposes	8,740.2
Construction in progress, including land under development	765.9	$ 982.2	$ 946.3
Amsterdam I
Initial Costs
Land	9
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0.5
Building and Improvements	12.3
Equipment	38.4
Gross Carrying Amount
Land	9.5
Building and Improvements	12.3
Equipment	38.4
Accumulated Depreciation	6.2
Austin II
Initial Costs
Land	2
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	23.5
Equipment	14.8
Gross Carrying Amount
Land	2
Building and Improvements	23.5
Equipment	14.8
Accumulated Depreciation	24.6
Austin III
Initial Costs
Land	3.3
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	12.7
Equipment	72.8
Gross Carrying Amount
Land	3.3
Building and Improvements	12.7
Equipment	72.8
Accumulated Depreciation	29
Chicago - Aurora I
Initial Costs
Land	2.4
Building and Improvements	26
Equipment	97.3
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	6.4
Equipment	41.1
Gross Carrying Amount
Land	2.4
Building and Improvements	32.4
Equipment	138.4
Accumulated Depreciation	88.7
Chicago - Aurora II
Initial Costs
Land	2.6
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	23.4
Equipment	74.7
Gross Carrying Amount
Land	2.6
Building and Improvements	23.4
Equipment	74.7
Accumulated Depreciation	30.1
Chicago - Aurora Tower
Initial Costs
Land	0
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	6.4
Equipment	1.3
Gross Carrying Amount
Land	0
Building and Improvements	6.4
Equipment	1.3
Accumulated Depreciation	1.4
Chicago - Lombard
Initial Costs
Land	0.7
Building and Improvements	3.2
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	1.6
Equipment	8.4
Gross Carrying Amount
Land	0.7
Building and Improvements	4.8
Equipment	8.4
Accumulated Depreciation	9.6
Cincinnati - 7th Street
Initial Costs
Land	0.9
Building and Improvements	42.2
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	72
Equipment	38.7
Gross Carrying Amount
Land	0.9
Building and Improvements	114.2
Equipment	38.7
Accumulated Depreciation	112.8
Cincinnati - Blue Ash
Initial Costs
Land	0
Building and Improvements	2.6
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(1.9)
Equipment	0.2
Gross Carrying Amount
Land	0
Building and Improvements	0.7
Equipment	0.2
Accumulated Depreciation	0.8
Cincinnati - Hamilton
Initial Costs
Land	0
Building and Improvements	9.5
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	34.2
Equipment	8.2
Gross Carrying Amount
Land	0
Building and Improvements	43.7
Equipment	8.2
Accumulated Depreciation	42.7
Cincinnati - Mason
Initial Costs
Land	0
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	20.3
Equipment	2
Gross Carrying Amount
Land	0
Building and Improvements	20.3
Equipment	2
Accumulated Depreciation	17.5
Cincinnati - Northern Cincinnati
Initial Costs
Land	0.9
Building and Improvements	12.3
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	65.5
Equipment	25.9
Gross Carrying Amount
Land	0.9
Building and Improvements	77.8
Equipment	25.9
Accumulated Depreciation	59.9
Council Bluffs I
Initial Costs
Land	1.4
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	24
Equipment	30.3
Gross Carrying Amount
Land	1.4
Building and Improvements	24
Equipment	30.3
Accumulated Depreciation	4.1
Dallas - Allen
Initial Costs
Land	6.5
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	16.2
Equipment	41.4
Gross Carrying Amount
Land	6.5
Building and Improvements	16.2
Equipment	41.4
Accumulated Depreciation	12.4
Dallas - Carrollton
Initial Costs
Land	16.1
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	67.2
Equipment	361.6
Gross Carrying Amount
Land	16.1
Building and Improvements	67.2
Equipment	361.6
Accumulated Depreciation	198
Dallas - Lewisville
Initial Costs
Land	0
Building and Improvements	46.2
Equipment	2.2
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	12
Equipment	40.3
Gross Carrying Amount
Land	0
Building and Improvements	58.2
Equipment	42.5
Accumulated Depreciation	81.5
Dublin I
Initial Costs
Land	4.7
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	49.3
Equipment	67.5
Gross Carrying Amount
Land	4.7
Building and Improvements	49.3
Equipment	67.5
Accumulated Depreciation	4.1
Florence
Initial Costs
Land	2.2
Building and Improvements	7.7
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	36.2
Equipment	11.1
Gross Carrying Amount
Land	2.2
Building and Improvements	43.9
Equipment	11.1
Accumulated Depreciation	41.3
Frankfurt I
Initial Costs
Land	4.1
Building and Improvements	35.2
Equipment	120.5
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	1.2
Equipment	4.8
Gross Carrying Amount
Land	4.1
Building and Improvements	36.4
Equipment	125.3
Accumulated Depreciation	34.8
Frankfurt II
Initial Costs
Land	7
Building and Improvements	0
Equipment	54.1
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	138.5
Equipment	47
Gross Carrying Amount
Land	7
Building and Improvements	138.5
Equipment	101.1
Accumulated Depreciation	42.3
Frankfurt III
Initial Costs
Land	22.3
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	89.3
Equipment	151
Gross Carrying Amount
Land	22.3
Building and Improvements	89.3
Equipment	151
Accumulated Depreciation	15.8
Houston - Galleria
Initial Costs
Land	0
Building and Improvements	56
Equipment	2
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	15.3
Equipment	23.7
Gross Carrying Amount
Land	0
Building and Improvements	71.3
Equipment	25.7
Accumulated Depreciation	71
Houston - Houston West I
Initial Costs
Land	1.4
Building and Improvements	21.4
Equipment	0.1
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	63.7
Equipment	55
Gross Carrying Amount
Land	1.4
Building and Improvements	85.1
Equipment	55.1
Accumulated Depreciation	105.8
Houston - Houston West II
Initial Costs
Land	2
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0.7
Building and Improvements	22.8
Equipment	54.2
Gross Carrying Amount
Land	2.7
Building and Improvements	22.8
Equipment	54.2
Accumulated Depreciation	48.9
Houston - Houston West III
Initial Costs
Land	7.1
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0.1
Building and Improvements	18.2
Equipment	33.1
Gross Carrying Amount
Land	7.2
Building and Improvements	18.2
Equipment	33.1
Accumulated Depreciation	20.5
London - Great Bridgewater
Initial Costs
Land	0
Building and Improvements	28.5
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(28.5)
Equipment	1.7
Gross Carrying Amount
Land	0
Building and Improvements	0
Equipment	1.7
Accumulated Depreciation	1.3
London I
Initial Costs
Land	0
Building and Improvements	34.2
Equipment	37.4
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	16.8
Equipment	19.4
Gross Carrying Amount
Land	0
Building and Improvements	51
Equipment	56.8
Accumulated Depreciation	20.6
London II
Initial Costs
Land	0
Building and Improvements	26.9
Equipment	79.3
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	25.1
Equipment	40.7
Gross Carrying Amount
Land	0
Building and Improvements	52
Equipment	120
Accumulated Depreciation	51
London III
Initial Costs
Land	0
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	16.8
Equipment	58.7
Gross Carrying Amount
Land	0
Building and Improvements	16.8
Equipment	58.7
Accumulated Depreciation	6.1
London IV
Initial Costs
Land	0
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	76.5
Equipment	0
Gross Carrying Amount
Land	0
Building and Improvements	76.5
Equipment	0
Accumulated Depreciation	0
London V
Initial Costs
Land	0
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	52.8
Equipment	0
Gross Carrying Amount
Land	0
Building and Improvements	52.8
Equipment	0
Accumulated Depreciation	0
Northern Virginia - Sterling I
Initial Costs
Land	1.6
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0.1
Building and Improvements	20.2
Equipment	62.2
Gross Carrying Amount
Land	1.7
Building and Improvements	20.2
Equipment	62.2
Accumulated Depreciation	42
Northern Virginia - Sterling II
Initial Costs
Land	3.4
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	28.8
Equipment	111.8
Gross Carrying Amount
Land	3.4
Building and Improvements	28.8
Equipment	111.8
Accumulated Depreciation	52.9
Northern Virginia - Sterling III
Initial Costs
Land	1.9
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	22.3
Equipment	60.9
Gross Carrying Amount
Land	1.9
Building and Improvements	22.3
Equipment	60.9
Accumulated Depreciation	30.3
Northern Virginia - Sterling IV
Initial Costs
Land	4.6
Building and Improvements	9.6
Equipment	0.1
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	10.5
Equipment	76.4
Gross Carrying Amount
Land	4.6
Building and Improvements	20.1
Equipment	76.5
Accumulated Depreciation	34.4
Northern Virginia - Sterling V
Initial Costs
Land	14.5
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	93.9
Equipment	329.2
Gross Carrying Amount
Land	14.5
Building and Improvements	93.9
Equipment	329.2
Accumulated Depreciation	123.1
Northern Virginia - Sterling VI
Initial Costs
Land	9.7
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	68.9
Equipment	220.2
Gross Carrying Amount
Land	9.7
Building and Improvements	68.9
Equipment	220.2
Accumulated Depreciation	62
Northern Virginia - Sterling VII
Initial Costs
Land	5.9
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	0
Equipment	0.1
Gross Carrying Amount
Land	5.9
Building and Improvements	0
Equipment	0.1
Accumulated Depreciation	0
Northern Virginia - Sterling VIII
Initial Costs
Land	9.1
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	25.3
Equipment	74
Gross Carrying Amount
Land	9.1
Building and Improvements	25.3
Equipment	74
Accumulated Depreciation	13.4
Northern Virginia - Sterling IX
Initial Costs
Land	16.1
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	74
Equipment	125.6
Gross Carrying Amount
Land	16.1
Building and Improvements	74
Equipment	125.6
Accumulated Depreciation	10.3
Norwalk I
Initial Costs
Land	0
Building and Improvements	18.3
Equipment	25.3
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(14)
Equipment	(2.1)
Gross Carrying Amount
Land	0
Building and Improvements	4.3
Equipment	23.2
Accumulated Depreciation	7.2
Paris I
Initial Costs
Land	0
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	1.8
Equipment	55.1
Gross Carrying Amount
Land	0
Building and Improvements	1.8
Equipment	55.1
Accumulated Depreciation	2.4
Phoenix - Chandler I
Initial Costs
Land	2.5
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	61.9
Equipment	72.6
Gross Carrying Amount
Land	2.5
Building and Improvements	61.9
Equipment	72.6
Accumulated Depreciation	70.1
Phoenix - Chandler II
Initial Costs
Land	2.1
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	16.2
Equipment	39.8
Gross Carrying Amount
Land	2.1
Building and Improvements	16.2
Equipment	39.8
Accumulated Depreciation	31.9
Phoenix - Chandler III
Initial Costs
Land	2
Building and Improvements	0.9
Equipment	2.5
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	10.5
Equipment	63.4
Gross Carrying Amount
Land	2
Building and Improvements	11.4
Equipment	65.9
Accumulated Depreciation	26.8
Phoenix - Chandler IV
Initial Costs
Land	2
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	18.4
Equipment	45.5
Gross Carrying Amount
Land	2
Building and Improvements	18.4
Equipment	45.5
Accumulated Depreciation	21
Phoenix - Chandler V
Initial Costs
Land	1.8
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	23.6
Equipment	120.5
Gross Carrying Amount
Land	1.8
Building and Improvements	23.6
Equipment	120.5
Accumulated Depreciation	26.4
Phoenix - Chandler VI
Initial Costs
Land	2.3
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0.1
Building and Improvements	25.1
Equipment	102.9
Gross Carrying Amount
Land	2.4
Building and Improvements	25.1
Equipment	102.9
Accumulated Depreciation	40.6
Phoenix - Chandler VII
Initial Costs
Land	4.2
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	20.3
Equipment	70.2
Gross Carrying Amount
Land	4.2
Building and Improvements	20.3
Equipment	70.2
Accumulated Depreciation	2.2
Raleigh-Durham I
Initial Costs
Land	2.1
Building and Improvements	73.5
Equipment	71.3
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	10.8
Equipment	31
Gross Carrying Amount
Land	2.1
Building and Improvements	84.3
Equipment	102.3
Accumulated Depreciation	62.8
San Antonio I
Initial Costs
Land	4.6
Building and Improvements	3
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	28.7
Equipment	38.8
Gross Carrying Amount
Land	4.6
Building and Improvements	31.7
Equipment	38.8
Accumulated Depreciation	44.6
San Antonio II
Initial Costs
Land	2.3
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0.3
Building and Improvements	30.3
Equipment	61.4
Gross Carrying Amount
Land	2.6
Building and Improvements	30.3
Equipment	61.4
Accumulated Depreciation	37.2
San Antonio III
Initial Costs
Land	2.3
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	40.2
Equipment	100.1
Gross Carrying Amount
Land	2.3
Building and Improvements	40.2
Equipment	100.1
Accumulated Depreciation	50.2
San Antonio IV
Initial Costs
Land	2.1
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	60.6
Equipment	51.3
Gross Carrying Amount
Land	2.1
Building and Improvements	60.6
Equipment	51.3
Accumulated Depreciation	29.5
San Antonio V
Initial Costs
Land	2.9
Building and Improvements	0
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	47.9
Equipment	106.4
Gross Carrying Amount
Land	2.9
Building and Improvements	47.9
Equipment	106.4
Accumulated Depreciation	13.1
Santa Clara II
Initial Costs
Land	0
Building and Improvements	2.7
Equipment	0
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	0
Equipment	0.2
Gross Carrying Amount
Land	0
Building and Improvements	2.7
Equipment	0.2
Accumulated Depreciation	2.7
Somerset I
Initial Costs
Land	12.1
Building and Improvements	124.6
Equipment	83.3
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	32.7
Equipment	78
Gross Carrying Amount
Land	12.1
Building and Improvements	157.3
Equipment	161.3
Accumulated Depreciation	85.3
Stamford - Omega
Initial Costs
Land	0
Building and Improvements	3.2
Equipment	0.6
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(3.2)
Equipment	(0.6)
Gross Carrying Amount
Land	0
Building and Improvements	0
Equipment	0
Accumulated Depreciation	0
Stamford - Riverbend
Initial Costs
Land	0
Building and Improvements	4.3
Equipment	13.2
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(3.4)
Equipment	(4.2)
Gross Carrying Amount
Land	0
Building and Improvements	0.9
Equipment	9
Accumulated Depreciation	8.8
Totowa - Commerce
Initial Costs
Land	0
Building and Improvements	4.1
Equipment	0.8
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(3.5)
Equipment	1
Gross Carrying Amount
Land	0
Building and Improvements	0.6
Equipment	1.8
Accumulated Depreciation	1.7
Totowa - Madison
Initial Costs
Land	0
Building and Improvements	28.3
Equipment	45.6
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(22.2)
Equipment	15.6
Gross Carrying Amount
Land	0
Building and Improvements	6.1
Equipment	61.2
Accumulated Depreciation	46.3
Wappinger Falls I
Initial Costs
Land	0
Building and Improvements	9.9
Equipment	13.3
Cost Capitalized Subsequent to Acquisition
Land	0
Building and Improvements	(6.7)
Equipment	16.1
Gross Carrying Amount
Land	0
Building and Improvements	3.2
Equipment	29.4
Accumulated Depreciation	$ 22.1

Schedule III. Real Estate Pro_3

Schedule III. Real Estate Properties and Accumulated Depreciation - Historical Cost and Accumulated Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property
Balance—beginning of period	$ 7,033.4	$ 6,089.5	$ 5,347.5
Disposals	(25.5)	(6.7)	(15.8)
Impairments	(0.5)	(10.8)	(0.7)
Additions (acquisitions and improvements)	844.2	866	850.6
Foreign exchange (loss) gain	(89.6)	95.4	5.7
Balance, end of period	7,762	7,033.4	6,089.5
Accumulated Depreciation
Balance—beginning of period	1,767.9	1,379.2	1,054.5
Disposals	(19.4)	(5.9)	(14)
Additions (depreciation and amortization expense)	443.1	401	357
Foreign exchange (loss) gain	(7.5)	(6.4)	1
Balance, end of period	2,184.1	1,767.9	1,379.2
Construction in progress, including land under development	765.9	$ 982.2	946.3
Accounting Standards Update [Extensible List]		Accounting Standards Update 2016-02 [Member]
Cumulative Effect, Period of Adoption, Adjustment
Property
Balance—beginning of period	0	$ 0	(97.8)
Balance, end of period		0	0
Accumulated Depreciation
Balance—beginning of period	$ 0	0	(19.3)
Balance, end of period		$ 0	$ 0