Related Party Transactions - Schedule of Related Party Transactions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified		3 Months Ended		2 Months Ended	3 Months Ended		2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	2 Months Ended	3 Months Ended	1 Months Ended		1 Months Ended				2 Months Ended	1 Months Ended			2 Months Ended	1 Months Ended
	Feb. 19, 2014	Mar. 31, 2014 Transition services provided to CBTS (network interfaces)	Mar. 31, 2014 209 West 7th Street rent provided by CBT [Member]	Mar. 31, 2013 Successor [Member]	Mar. 31, 2014 Successor [Member]	Mar. 31, 2014 Successor [Member] Cincinnati Bell Inc. [Member]	Mar. 31, 2013 Successor [Member] Data center colocation agreement provided to CBT and CBTS	Mar. 31, 2014 Successor [Member] Data center colocation agreement provided to CBT and CBTS	Mar. 31, 2013 Successor [Member] 229 West 7th Street lease provided to CBT	Mar. 31, 2014 Successor [Member] 229 West 7th Street lease provided to CBT	Mar. 31, 2013 Successor [Member] Goldcoast Drive lease provided to CBT [Member] CyrusOne L.P. [Member]	Mar. 31, 2014 Successor [Member] Goldcoast Drive lease provided to CBT [Member] CyrusOne L.P. [Member]	Mar. 31, 2013 Successor [Member] Transition services provided to CBTS (network interfaces)	Mar. 31, 2014 Successor [Member] Transition services provided to CBTS (network interfaces)	Mar. 31, 2013 Successor [Member] Data center leases provided to CBTS	Mar. 31, 2014 Successor [Member] Data center leases provided to CBTS	Mar. 31, 2013 Successor [Member] Charges for services provided by CBT (connectivity)	Mar. 31, 2014 Successor [Member] Charges for services provided by CBT (connectivity)	Mar. 31, 2013 Successor [Member] Allocated employee benefit plans by CBI	Mar. 31, 2014 Successor [Member] Allocated employee benefit plans by CBI	Mar. 31, 2013 Successor [Member] Allocated centralized insurance costs by CBI	Mar. 31, 2014 Successor [Member] Allocated centralized insurance costs by CBI	Jan. 23, 2013 Predecessor [Member]	Dec. 31, 2013 Predecessor [Member] Cincinnati Bell Inc. [Member]	Jan. 23, 2013 Predecessor [Member] Data center colocation agreement provided to CBT and CBTS	Jan. 23, 2013 Predecessor [Member] 229 West 7th Street lease provided to CBT	Jan. 23, 2013 Predecessor [Member] Goldcoast Drive lease provided to CBT [Member] CyrusOne L.P. [Member]	Jan. 23, 2013 Predecessor [Member] Transition services provided to CBTS (network interfaces)	Mar. 31, 2013 Predecessor [Member] Transition services provided to CBTS (network interfaces)	Jan. 23, 2013 Predecessor [Member] Data center leases provided to CBTS	Jan. 23, 2013 Predecessor [Member] Charges for services provided by CBT (connectivity)	Jan. 23, 2013 Predecessor [Member] 209 West 7th Street rent provided by CBT [Member]	Mar. 31, 2013 Predecessor [Member] 209 West 7th Street rent provided by CBT [Member]	Jan. 23, 2013 Predecessor [Member] Allocated employee benefit plans by CBI	Jan. 23, 2013 Predecessor [Member] Allocated centralized insurance costs by CBI
Revenue:
Total revenue				$ 3.6	$ 5.8		$ 1.0	$ 1.5	$ 0	$ 0.5	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 2.4	$ 3.6							$ 0.4		$ 0.3	$ 0	$ 0	$ 0.1		$ 0
Operating costs and expenses:
Total operating costs and expenses		0.3	0	0.1	0.6												0.1	0.3	0	0	0	0	0.4					0	0		0.1	0	0	0.2	0.1
Accounts receivable from CBI
Accounts receivable from CBI						0																		0
Total amounts payable to CBI
Accounts payable						0																		0
Distributions payable						0																		0
Total amounts payable to CBI						$ 0																		$ 0
Cash dividend payable to stockholders (in dollars per share)	$ 0.21