Basis of Presentation	9 Months Ended
Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying financial statements as of September 30, 2014 and December 31, 2013, and for the three and nine months ended September 30, 2014 and for the three months ended September 30, 2013 and for the period from January 24, 2013 to September 30, 2013, are prepared on a consolidated basis and are presented as the “Successor” financial statements. The financial statements for the period from January 1, 2013 to January 23, 2013 ("Predecessor Period") were prepared on a combined basis using CBI’s historical basis in the assets and liabilities of its data center business and are presented as the “Predecessor” financial statements. The Predecessor financial statements include all revenues, costs, assets and liabilities directly attributable to the data center business. In addition, certain expenses reflected in the Predecessor financial statements include allocations of corporate expenses from CBI, which in the opinion of management are reasonable but do not necessarily reflect what CyrusOne’s financial position, results of operations and cash flows would have been had CyrusOne been a stand-alone company during these respective periods. As a result, the Predecessor financial information is not necessarily indicative of CyrusOne’s future results of operations, financial position and cash flows. In addition, the accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and should be read in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission (“SEC”) on March 3, 2014. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been omitted from this report on Form 10-Q pursuant to the rules and regulations of the SEC. It should also be noted that the results for the interim periods shown in this report are not necessarily indicative of future financial results and have not been audited by our independent registered public accounting firm. In the opinion of management, the accompanying unaudited condensed consolidated and combined financial statements include all adjustments necessary to present fairly our financial position as of September 30, 2014, and our results of operations, for the three and nine months ended September 30, 2014, and the three months ended September 30, 2013 and the periods ended September 30, 2013 (January 24, 2013 to September 30, 2013) and January 23, 2013 (January 1, 2013 to January 23, 2013). These adjustments are of a normal recurring nature and consistent with the adjustments recorded to prepare the annual audited financial statements as of December 31, 2013.

Basis of Presentation

The accompanying financial statements as of September 30, 2014 and December 31, 2013, and for the three and nine months ended September 30, 2014 and for the three months ended September 30, 2013 and for the period from January 24, 2013 to September 30, 2013, are prepared on a consolidated basis and are presented as the “Successor” financial statements. The financial statements for the period from January 1, 2013 to January 23, 2013 ("Predecessor Period") were prepared on a combined basis using CBI’s historical basis in the assets and liabilities of its data center business and are presented as the “Predecessor” financial statements. The Predecessor financial statements include all revenues, costs, assets and liabilities directly attributable to the data center business. In addition, certain expenses reflected in the Predecessor financial statements include allocations of corporate expenses from CBI, which in the opinion of management are reasonable but do not necessarily reflect what CyrusOne’s financial position, results of operations and cash flows would have been had CyrusOne been a stand-alone company during these respective periods. As a result, the Predecessor financial information is not necessarily indicative of CyrusOne’s future results of operations, financial position and cash flows.

In addition, the accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and should be read in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission (“SEC”) on March 3, 2014. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been omitted from this report on Form 10-Q pursuant to the rules and regulations of the SEC.

It should also be noted that the results for the interim periods shown in this report are not necessarily indicative of future financial results and have not been audited by our independent registered public accounting firm. In the opinion of management, the accompanying unaudited condensed consolidated and combined financial statements include all adjustments necessary to present fairly our financial position as of September 30, 2014, and our results of operations, for the three and nine months ended September 30, 2014, and the three months ended September 30, 2013 and the periods ended September 30, 2013 (January 24, 2013 to September 30, 2013) and January 23, 2013 (January 1, 2013 to January 23, 2013). These adjustments are of a normal recurring nature and consistent with the adjustments recorded to prepare the annual audited financial statements as of December 31, 2013.