Noncontrolling Interests - Operating Partnership (Details) - USD ($) $ in Millions							3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 14, 2015	Jun. 26, 2015	Apr. 07, 2015	Jun. 25, 2014	Jan. 24, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Ownership %	100.00%						100.00%				59.20%					100.00%	59.20%
Ownership percentage by noncontrolling owners	0.00%						0.00%				40.80%					0.00%	40.80%
Net loss attributed to common shareholders							$ (1.0)	$ (4.6)	$ (5.5)	$ (4.3)	$ (7.0)	$ 0.1	$ (1.1)	$ 0.2	$ (5.3)	$ (15.4)	$ (7.8)	$ (5.3)
Noncontrolling interest in net loss															(10.3)	(4.8)	(6.7)
Dividends declared															(41.4)	$ (90.9)	$ (54.9)
Rate partnership units are converted (in shares)																1
Common stock issued (in shares)																200,000
Cincinnati Bell Inc.
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners	9.50%						9.50%									9.50%
IPO
Noncontrolling Interest [Line Items]
Common stock issued (in shares)	6,346,835	1,350,000	13,000,000	14,300,000	16,000,000.0	19,000,000
Parent
Noncontrolling Interest [Line Items]
Operating partnership units	72,600,000						72,600,000				38,700,000					72,600,000	38,700,000
Noncontrolling interest in net loss															10.3	$ 4.8	$ 6.7
Dividends declared															(13.6)	$ (74.6)	$ (29.2)
Non Controlling Interest
Noncontrolling Interest [Line Items]
Operating partnership units	0						0				26,600,000					0	26,600,000
Noncontrolling interest in net loss															(10.3)	$ (4.8)	$ (6.7)
Dividends declared															$ (27.8)	$ (16.3)	$ (25.7)