Supplemental Guarantor Information - Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	$ 312.4	$ 299.8	$ 900.5	$ 878.5
Operating costs and expenses	286.9	263.6	818.0	775.5
Operating income (loss)	25.5	36.2	82.5	103.0
Interest expense (income), net	17.9	21.5	58.1	82.2
Other expense (income), net	(0.1)	1.2	(1.2)	6.0
Income (loss) before equity in earnings of subsidiaries and income taxes	29.6	123.4	163.3	406.4
Income tax expense (benefit)	(10.8)	(44.1)	(59.9)	(146.1)
Income from continuing operations	18.8	79.3	103.4	260.3
Income (loss) from discontinued operations, net of tax	0.0	1.0	0.0	60.8
Net income	18.8	80.3	103.4	321.1
Total comprehensive income (loss)	20.2	81.7	107.8	329.9
Preferred stock dividends	2.6	2.6	7.8	7.8
Net income (loss) applicable to common shareowners	16.2	77.7	95.6	313.3
Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	312.4	299.8	900.5	878.5
Operating costs and expenses	286.9	263.6	818.0	775.5
Operating income (loss)	25.5	36.2	82.5	103.0
Interest expense (income), net	17.9	21.5	58.1	82.2
Other expense (income), net	(22.0)	(108.7)	(138.9)	(385.6)
Income (loss) before equity in earnings of subsidiaries and income taxes	29.6	123.4	163.3	406.4
Income tax expense (benefit)	(10.8)	(44.1)	(59.9)	(146.1)
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Income from continuing operations		79.3		260.3
Income (loss) from discontinued operations, net of tax		1.0		60.8
Net income	18.8	80.3	103.4	321.1
Other comprehensive income (loss)	1.4	1.4	4.4	8.8
Total comprehensive income (loss)	20.2	81.7	107.8	329.9
Preferred stock dividends	2.6	2.6	7.8	7.8
Net income (loss) applicable to common shareowners	16.2	77.7	95.6	313.3
Notes guaranteed by parent [Member] \| Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	(10.0)	(9.5)	(30.2)	(28.9)
Operating costs and expenses	(10.0)	(9.5)	(30.2)	(28.9)
Operating income (loss)	0.0	0.0	0.0	0.0
Interest expense (income), net	0.0	0.0	0.0	0.0
Other expense (income), net	0.0	0.0	0.0	0.0
Income (loss) before equity in earnings of subsidiaries and income taxes	0.0	0.0	0.0	0.0
Income tax expense (benefit)	0.0	0.0	0.0	0.0
Equity in earnings of subsidiaries, net of tax	(43.0)	(103.3)	(169.4)	(401.1)
Income from continuing operations		(103.3)		(401.1)
Income (loss) from discontinued operations, net of tax		0.0		0.0
Net income	(43.0)	(103.3)	(169.4)	(401.1)
Other comprehensive income (loss)	0.0	0.0	0.0	0.0
Total comprehensive income (loss)	(43.0)	(103.3)	(169.4)	(401.1)
Preferred stock dividends	0.0	0.0	0.0	0.0
Net income (loss) applicable to common shareowners	(43.0)	(103.3)	(169.4)	(401.1)
Notes guaranteed by parent [Member] \| Parent Company [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	0.0	0.0	0.0	0.0
Operating costs and expenses	3.2	2.4	15.3	14.1
Operating income (loss)	(3.2)	(2.4)	(15.3)	(14.1)
Interest expense (income), net	23.0	25.3	70.4	87.6
Other expense (income), net	11.3	7.4	16.0	20.1
Income (loss) before equity in earnings of subsidiaries and income taxes	(37.5)	(35.1)	(101.7)	(121.8)
Income tax expense (benefit)	13.3	12.1	35.7	41.8
Equity in earnings of subsidiaries, net of tax	43.0	103.3	169.4	401.1
Income from continuing operations		80.3		321.1
Income (loss) from discontinued operations, net of tax		0.0		0.0
Net income	18.8	80.3	103.4	321.1
Other comprehensive income (loss)	1.4	1.7	4.5	9.2
Total comprehensive income (loss)	20.2	82.0	107.9	330.3
Preferred stock dividends	2.6	2.6	7.8	7.8
Net income (loss) applicable to common shareowners	16.2	77.7	95.6	313.3
Notes guaranteed by parent [Member] \| Cincinnati Bell Telephone Company [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	170.0	164.5	507.8	493.6
Operating costs and expenses	150.1	135.9	436.2	398.5
Operating income (loss)	19.9	28.6	71.6	95.1
Interest expense (income), net	1.0	0.0	3.1	(1.1)
Other expense (income), net	1.0	1.7	2.5	5.2
Income (loss) before equity in earnings of subsidiaries and income taxes	17.9	26.9	66.0	91.0
Income tax expense (benefit)	(6.4)	(10.1)	(23.6)	(33.3)
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Income from continuing operations		16.8		57.7
Income (loss) from discontinued operations, net of tax		0.0		0.0
Net income	11.5	16.8	42.4	57.7
Other comprehensive income (loss)	0.0	0.0	0.0	0.0
Total comprehensive income (loss)	11.5	16.8	42.4	57.7
Preferred stock dividends	0.0	0.0	0.0	0.0
Net income (loss) applicable to common shareowners	11.5	16.8	42.4	57.7
Notes guaranteed by parent [Member] \| Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	152.4	144.8	422.9	413.8
Operating costs and expenses	143.6	134.8	396.7	391.8
Operating income (loss)	8.8	10.0	26.2	22.0
Interest expense (income), net	(6.1)	(3.8)	(15.4)	(4.3)
Other expense (income), net	(34.3)	(117.8)	(157.4)	(410.9)
Income (loss) before equity in earnings of subsidiaries and income taxes	49.2	131.6	199.0	437.2
Income tax expense (benefit)	(17.7)	(46.1)	(72.0)	(154.6)
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Income from continuing operations		85.5		282.6
Income (loss) from discontinued operations, net of tax		1.0		60.8
Net income	31.5	86.5	127.0	343.4
Other comprehensive income (loss)	0.0	(0.3)	(0.1)	(0.4)
Total comprehensive income (loss)	31.5	86.2	126.9	343.0
Preferred stock dividends	0.0	0.0	0.0	0.0
Net income (loss) applicable to common shareowners	31.5	86.5	127.0	343.4
Notes guaranteed by subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	312.4	299.8	900.5	878.5
Operating costs and expenses	286.9	263.6	818.0	775.5
Operating income (loss)	25.5	36.2	82.5	103.0
Interest expense (income), net	17.9	21.5	58.1	82.2
Other expense (income), net	(22.0)	(108.7)	(138.9)	(385.6)
Income (loss) before equity in earnings of subsidiaries and income taxes	29.6	123.4	163.3	406.4
Income tax expense (benefit)	(10.8)	(44.1)	(59.9)	(146.1)
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Income from continuing operations		79.3		260.3
Income (loss) from discontinued operations, net of tax		1.0		60.8
Net income	18.8	80.3	103.4	321.1
Other comprehensive income (loss)	1.4	1.4	4.4	8.8
Total comprehensive income (loss)	20.2	81.7	107.8	329.9
Preferred stock dividends	2.6	2.6	7.8	7.8
Net income (loss) applicable to common shareowners	16.2	77.7	95.6	313.3
Notes guaranteed by subsidiaries [Member] \| Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	(10.0)	(9.5)	(30.2)	(28.9)
Operating costs and expenses	(10.0)	(9.5)	(30.2)	(28.9)
Operating income (loss)	0.0	0.0	0.0	0.0
Interest expense (income), net	0.0	0.0	0.0	0.0
Other expense (income), net	0.0	0.0	0.0	0.0
Income (loss) before equity in earnings of subsidiaries and income taxes	0.0	0.0	0.0	0.0
Income tax expense (benefit)	0.0	0.0	0.0	0.0
Equity in earnings of subsidiaries, net of tax	(43.0)	(103.3)	(169.4)	(401.1)
Income from continuing operations		(103.3)		(401.1)
Income (loss) from discontinued operations, net of tax		0.0		0.0
Net income	(43.0)	(103.3)	(169.4)	(401.1)
Other comprehensive income (loss)	0.0	0.0	0.0	0.0
Total comprehensive income (loss)	(43.0)	(103.3)	(169.4)	(401.1)
Preferred stock dividends	0.0	0.0	0.0	0.0
Net income (loss) applicable to common shareowners	(43.0)	(103.3)	(169.4)	(401.1)
Notes guaranteed by subsidiaries [Member] \| Parent Company [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	0.0	0.0	0.0	0.0
Operating costs and expenses	3.2	2.4	15.3	14.1
Operating income (loss)	(3.2)	(2.4)	(15.3)	(14.1)
Interest expense (income), net	23.0	25.3	70.4	87.6
Other expense (income), net	11.3	7.4	16.0	20.1
Income (loss) before equity in earnings of subsidiaries and income taxes	(37.5)	(35.1)	(101.7)	(121.8)
Income tax expense (benefit)	13.3	12.1	35.7	41.8
Equity in earnings of subsidiaries, net of tax	43.0	103.3	169.4	401.1
Income from continuing operations		80.3		321.1
Income (loss) from discontinued operations, net of tax		0.0		0.0
Net income	18.8	80.3	103.4	321.1
Other comprehensive income (loss)	1.4	1.7	4.5	9.2
Total comprehensive income (loss)	20.2	82.0	107.9	330.3
Preferred stock dividends	2.6	2.6	7.8	7.8
Net income (loss) applicable to common shareowners	16.2	77.7	95.6	313.3
Notes guaranteed by subsidiaries [Member] \| Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	175.9	158.5	491.3	462.1
Operating costs and expenses	158.9	148.0	440.1	437.1
Operating income (loss)	17.0	10.5	51.2	25.0
Interest expense (income), net	(6.6)	(4.2)	(16.7)	(5.2)
Other expense (income), net	(29.4)	(113.2)	(142.6)	(398.0)
Income (loss) before equity in earnings of subsidiaries and income taxes	53.0	127.9	210.5	428.2
Income tax expense (benefit)	(19.0)	(44.7)	(76.1)	(151.1)
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Income from continuing operations		83.2		277.1
Income (loss) from discontinued operations, net of tax		1.0		60.8
Net income	34.0	84.2	134.4	337.9
Other comprehensive income (loss)	0.0	0.0	0.0	0.0
Total comprehensive income (loss)	34.0	84.2	134.4	337.9
Preferred stock dividends	0.0	0.0	0.0	0.0
Net income (loss) applicable to common shareowners	34.0	84.2	134.4	337.9
Notes guaranteed by subsidiaries [Member] \| Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	146.5	150.8	439.4	445.3
Operating costs and expenses	134.8	122.7	392.8	353.2
Operating income (loss)	11.7	28.1	46.6	92.1
Interest expense (income), net	1.5	0.4	4.4	(0.2)
Other expense (income), net	(3.9)	(2.9)	(12.3)	(7.7)
Income (loss) before equity in earnings of subsidiaries and income taxes	14.1	30.6	54.5	100.0
Income tax expense (benefit)	(5.1)	(11.5)	(19.5)	(36.8)
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Income from continuing operations		19.1		63.2
Income (loss) from discontinued operations, net of tax		0.0		0.0
Net income	9.0	19.1	35.0	63.2
Other comprehensive income (loss)	0.0	(0.3)	(0.1)	(0.4)
Total comprehensive income (loss)	9.0	18.8	34.9	62.8
Preferred stock dividends	0.0	0.0	0.0	0.0
Net income (loss) applicable to common shareowners	$ 9.0	$ 19.1	$ 35.0	$ 63.2

Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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