Condensed Consolidated Balance Sheets (Successor [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 CyrusOne L.P. [Member]	Dec. 31, 2013 CyrusOne L.P. [Member]
Investment in real estate:
Land	$ 89.6	$ 89.3	$ 89.6	$ 89.3
Buildings and improvements	787.0	783.7	787.0	783.7
Equipment	206.4	190.2	206.4	190.2
Construction in progress	99.4	57.3	99.4	57.3
Subtotal	1,182.4	1,120.5	1,182.4	1,120.5
Accumulated depreciation	(257.6)	(236.7)	(257.6)	(236.7)
Net investment in real estate	924.8	883.8	924.8	883.8
Cash and cash equivalents	125.2	148.8	125.2	148.8
Rent and other receivables, net of allowance for doubtful accounts of $0.5 and $0.5 as of March 31, 2014, and December 31, 2013, respectively	42.4	41.2	42.4	41.2
Goodwill	276.2	276.2	276.2	276.2
Intangible assets, net of accumulated amortization of $59.3 and $55.1 as of March 31, 2014, and December 31, 2013, respectively	81.7	85.9	81.7	85.9
Due from affiliates	0.9	0.6	0.9	0.6
Other assets	76.9	70.3	76.9	70.3
Total assets	1,528.1	1,506.8	1,528.1	1,506.8
Liabilities and equity
Accounts payable and accrued expenses	88.8	66.8	88.8	66.8
Deferred revenue	64.8	55.9	64.8	55.9
Due to affiliates	10.8	8.5	10.8	8.5
Capital lease obligations	15.5	16.7	15.5	16.7
Long-term debt	525.0	525.0	525.0	525.0
Other financing arrangements	56.4	56.3	56.4	56.3
Total liabilities	761.3	729.2	761.3	729.2
Commitments and contingencies
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 22,679,417 and 21,991,669 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	0.2	0.2
Additional paid in capital	342.9	340.7
Accumulated deficit	(23.5)	(18.9)
Total shareholders’ equity	319.6	322.0
Noncontrolling interest	447.2	455.6
Total equity	766.8	777.6	766.8	777.6
Total liabilities and equity	$ 1,528.1	$ 1,506.8	$ 1,528.1	$ 1,506.8