Description of Business (Proposed Merger) (Details) - Twin Acquisition Corp. $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Long-Lived Assets
Proposed merger, agreement termination fee | $	$ 11.9
Professional fees | $	$ 0.2
Contingent consideration, cash
Long-Lived Assets
Proposed merger, company shareholders' consideration in cash (per share) | $ / shares	$ 30.75
Proposed merger, consideration proration of final distribution (as a percentage)	60.00%
Contingent consideration, Cincinnati Bell common stock
Long-Lived Assets
Proposed merger, company shareholders' consideration in Cincinnati Bell common stock shares | shares	1.6305
Proposed merger, consideration proration of final distribution (as a percentage)	40.00%
Contingent consideration, cash and Cincinnati Bell common stock mixture
Long-Lived Assets
Proposed merger, company shareholders' consideration in cash (per share) | $ / shares	$ 18.45
Proposed merger, company shareholders' consideration in Cincinnati Bell common stock shares | shares	0.6522