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Description of Business	3 Months Ended
Description of Business	Mar. 31, 2020
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. wholly 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 March 31, 2020, all of the issued and outstanding Operating Partnership units of CyrusOne LP are owned, directly or indirectly, by the Company. 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 50 data centers, including two recovery centers, located in the United States, United Kingdom, Germany and Singapore. 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".