Basis of Presentation	12 Months Ended
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying financial statements as of December 31, 2012 and for the period ended January 23, 2013 and the years ended December 31, 2012 and 2011, 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 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. The financial statements as of December 31, 2013 and for the period from January 24, 2013 to December 31, 2013 are prepared on a consolidated basis and are presented as the “Successor” financial statements. In addition, the accompanying consolidated and combined balance sheets reflect a reclassification of certain financial statement accounts. We have combined 'other liabilities' with 'accounts payable and accrued expenses' as of December 31, 2012 and 2011 to conform to the 2013 presentation. We believe combining them more accurately reflects the nature of these accounts.

Basis of Presentation

The accompanying financial statements as of December 31, 2012 and for the period ended January 23, 2013 and the years ended December 31, 2012 and 2011, 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 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. The financial statements as of December 31, 2013 and for the period from January 24, 2013 to December 31, 2013 are prepared on a consolidated basis and are presented as the “Successor” financial statements.

In addition, the accompanying consolidated and combined balance sheets reflect a reclassification of certain financial statement accounts. We have combined 'other liabilities' with 'accounts payable and accrued expenses' as of December 31, 2012 and 2011 to conform to the 2013 presentation. We believe combining them more accurately reflects the nature of these accounts.