Related Party Transactions - Schedule of Related Party Revenue and Expenses (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 23, 2013	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Successor
Revenue:
Total revenue		$ 21.3	$ 22.3	$ 22.8
Operating costs and expenses:
Total operating costs and expenses		2.5	1.9	2.0
Successor | Data center colocation agreement provided to CBT and CBTS
Revenue:
Total revenue		5.6	7.8	6.4
Successor | 229 West 7th Street lease provided to CBT
Revenue:
Total revenue		1.7	1.9	2.0
Successor | Goldcoast Drive/Parkway (Mason) lease
Revenue:
Total revenue		0.3	0.3	0.4
Successor | Transition services provided to CBTS (network interfaces)
Revenue:
Total revenue		0.6	0.3	0.4
Successor | Data center leases provided to CBTS
Revenue:
Total revenue		13.1	12.0	13.6
Successor | Transition services agreement by CBTS
Operating costs and expenses:
Total operating costs and expenses		1.3	0.7	0.8
Successor | Charges for services provided by CBT (connectivity)
Operating costs and expenses:
Total operating costs and expenses		1.0	1.0	1.0
Successor | 209 West 7th Street rent provided by CBT
Operating costs and expenses:
Total operating costs and expenses		0.1	0.2	0.2
Successor | Management fees with CBI
Operating costs and expenses:
Total operating costs and expenses		0.1	0.0	0.0
Successor | Allocated employee benefit plans by CBI
Operating costs and expenses:
Total operating costs and expenses		0.0	0.0	0.0
Successor | Allocated centralized insurance costs by CBI
Operating costs and expenses:
Total operating costs and expenses		$ 0.0	$ 0.0	$ 0.0
Predecessor
Revenue:
Total revenue	$ 0.4
Operating costs and expenses:
Total operating costs and expenses	0.4
Predecessor | Data center colocation agreement provided to CBT and CBTS
Revenue:
Total revenue	0.3
Predecessor | 229 West 7th Street lease provided to CBT
Revenue:
Total revenue	0.0
Predecessor | Goldcoast Drive/Parkway (Mason) lease
Revenue:
Total revenue	0.0
Predecessor | Transition services provided to CBTS (network interfaces)
Revenue:
Total revenue	0.1
Predecessor | Data center leases provided to CBTS
Revenue:
Total revenue	0.0
Predecessor | Transition services agreement by CBTS
Operating costs and expenses:
Total operating costs and expenses	0.0
Predecessor | Charges for services provided by CBT (connectivity)
Operating costs and expenses:
Total operating costs and expenses	0.1
Predecessor | 209 West 7th Street rent provided by CBT
Operating costs and expenses:
Total operating costs and expenses	0.0
Predecessor | Management fees with CBI
Operating costs and expenses:
Total operating costs and expenses	0.0
Predecessor | Allocated employee benefit plans by CBI
Operating costs and expenses:
Total operating costs and expenses	0.2
Predecessor | Allocated centralized insurance costs by CBI
Operating costs and expenses:
Total operating costs and expenses	$ 0.1