Basis of Presentation	12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying financial statements for the period ended January 23, 2013 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 this period. The financial statements as of December 31, 2015 and 2014 and for the period from January 24, 2013 to December 31, 2013, and the years ended December 31, 2015 and December 31, 2014, are prepared on a consolidated basis and are presented as the “Successor” financial statements. In addition, the accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). All material intercompany transactions and balances have been eliminated in consolidation. All prior year amounts have been presented to conform to current year's presentation.

Basis of Presentation

The accompanying financial statements for the period ended January 23, 2013 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 this period. The financial statements as of December 31, 2015 and 2014 and for the period from January 24, 2013 to December 31, 2013, and the years ended December 31, 2015 and December 31, 2014, are prepared on a consolidated basis and are presented as the “Successor” financial statements.

In addition, the accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). All material intercompany transactions and balances have been eliminated in consolidation. All prior year amounts have been presented to conform to current year's presentation.