Supplemental Guarantor Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	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, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Apr. 01, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue	$ 289.3	$ 299.8	$ 285.8	$ 292.9	$ 294.9	$ 301.4	$ 283.0	$ 282.2	$ 1,167.8	$ 1,161.5	$ 1,073.4
Operating costs and expenses									1,039.8	984.6	933.6
Operating income (loss)	25.0	36.2	29.7	37.1	31.4	47.8	47.3	50.4	128.0	176.9	139.8
Other expense (income), net									(2.5)	(1.9)	(3.3)
Income (loss) before equity in earnings of subsidiaries and income taxes									450.6	199.1	(73.2)
Income tax expense (benefit)									159.8	81.4	(8.3)
Income (Loss) from Continuing Operations Attributable to Parent	30.5	79.3	180.7	0.3	(4.4)	(7.5)	123.7	5.9	290.8	117.7	(64.9)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	2.1	1.0	10.9	48.9	(13.9)	(19.8)	(9.5)	1.1	62.9	(42.1)	10.2
Net income (loss)	32.6	80.3	191.6	49.2	(18.3)	$ (27.3)	114.2	7.0	353.7	75.6	(54.7)
Other comprehensive income (loss)									2.9	(40.6)	76.4
Total comprehensive income (loss)									356.6	35.0	21.7
Preferred stock dividends									10.4	10.4	10.4
Net income (loss) applicable to common shareowners									343.3	65.2	(65.1)
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents	7.4			57.9	57.9			4.6	57.9	4.6	23.6	$ 7.4		$ 57.9	$ 4.6	$ 23.6
Other current assets												2.2		1.8
Disposal Group, Including Discontinued Operation, Other Assets, Current												0.0		4.7
Total current assets												200.4		268.7
Property, plant and equipment, net												975.5		815.4
Investment in CyrusOne												55.5		273.6
Other noncurrent assets												25.6		33.9
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent												0.0		44.6
Total assets												1,454.4		1,820.7
Current portion of long-term debt												13.8		11.6
Accounts payable												127.4		131.6
Other current liabilities												25.0		25.8
Disposal Group, Including Discontinued Operation, Other Liabilities, Current												5.4		142.0
Liabilities, Current												259.2		410.8
Long-term debt, less current portion												1,231.8		1,689.4
Other Liabilities, Noncurrent												36.6		26.2
Total liabilities												1,752.6		2,469.2
Stockholders' Equity Attributable to Parent												(298.2)		(648.5)	(676.7)	(698.2)
Total liabilities and shareowners' equity (deficit)												1,454.4		1,820.7
Condensed Consolidating Statements of Cash Flows [Abstract]
Cash flows (used in) provided by operating activities									110.9	175.2	78.8
Capital expenditures									(283.6)	(182.3)	(196.9)
Proceeds from Sale of Equity Method Investments	47.6	$ 170.3	$ 426.0				$ 355.9		643.9	355.9	0.0
Dividends received from CyrusOne									22.2	28.4	21.3
Proceeds from sale of assets									1.0	2.0	2.0
Cash Divested from Deconsolidation									0.0	0.0	(12.2)
Distributions received from subsidiaries [Abstract]
Other investing activities									(0.3)	(5.8)	0.0
Cash flows provided by (used in) investing activities									383.2	392.6	(185.4)
Proceeds from issuance of long-term debt									0.0	0.0	536.0
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days									(1.6)	(127.0)	94.2
Repayment of debt									(531.7)	(376.5)	(530.8)
Debt issuance costs									(0.4)	(0.9)	(6.7)
Proceeds from exercise of options and warrants									0.0	1.3	7.1
Other financing activities									(0.6)	(1.1)	(2.3)
Cash flows provided by (used in) financing activities									(544.6)	(514.5)	87.6
(Decrease) increase in cash and cash equivalents									(50.5)	53.3	(19.0)
Cash and cash equivalents at beginning of year				57.9				4.6	57.9	4.6	23.6
Cash and cash equivalents at end of year	7.4				57.9				7.4	57.9	4.6
Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue									1,167.8	1,161.5	1,073.4
Operating costs and expenses									1,039.8	984.6	933.6
Operating income (loss)									128.0	176.9	139.8
Interest Income (Expense), Net									103.1	145.9	176.0
Other expense (income), net									(425.7)	(168.1)	37.0
Income (loss) before equity in earnings of subsidiaries and income taxes									450.6	199.1	(73.2)
Income tax expense (benefit)									159.8	81.4	(8.3)
Equity in earnings of subsidiaries, net of tax									0.0	0.0	0.0
Income (Loss) from Continuing Operations Attributable to Parent									290.8	117.7	(64.9)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									62.9	(42.1)	10.2
Net income (loss)									353.7	75.6	(54.7)
Other comprehensive income (loss)									2.9	(40.6)	76.4
Total comprehensive income (loss)									356.6	35.0	21.7
Preferred stock dividends									10.4	10.4	10.4
Net income (loss) applicable to common shareowners									343.3	65.2	(65.1)
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents	7.4			57.9	57.9			4.6	57.9	4.6	23.6	7.4		57.9	4.6	23.6
Receivables, net												157.1		168.5
Other current assets												35.9		37.6
Disposal Group, Including Discontinued Operation, Other Assets, Current														4.7
Total current assets												200.4		268.7
Property, plant and equipment, net												975.5		815.4
Investment in CyrusOne												55.5		273.6
Goodwill and intangibles, net												14.5		14.9
Investments in and advances to subsidiaries												0.0		0.0
Other noncurrent assets												208.5		403.5
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent														44.6
Total assets												1,454.4		1,820.7
Current portion of long-term debt												13.8		11.6
Accounts payable												128.9		132.0
Other current liabilities												111.1		125.2
Disposal Group, Including Discontinued Operation, Other Liabilities, Current												5.4		142.0
Liabilities, Current												259.2		410.8
Long-term debt, less current portion												1,231.8		1,689.4
Other Liabilities, Noncurrent												261.6		266.3
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent														102.7
Intercompany payables												0.0		0.0
Total liabilities												1,752.6		2,469.2
Stockholders' Equity Attributable to Parent												(298.2)		(648.5)
Total liabilities and shareowners' equity (deficit)												1,454.4		1,820.7
Condensed Consolidating Statements of Cash Flows [Abstract]
Cash flows (used in) provided by operating activities									110.9	175.2	78.8
Capital expenditures									(283.6)	(182.3)	(196.9)
Proceeds from Sale of Equity Method Investments									643.9	355.9
Dividends received from CyrusOne									22.2	28.4	21.3
Proceeds from sale of assets									1.0	196.4	2.0
Cash Divested from Deconsolidation											(12.2)
Distributions received from subsidiaries									0.0	0.0
Funding between Parent and subsidiaries, net investing									0.0	0.0
Distributions received from subsidiaries [Abstract]
Other investing activities									(0.3)	(5.8)	0.4
Cash flows provided by (used in) investing activities									383.2	392.6	(185.4)
Funding between Parent and subsidiaries, net financing									0.0	0.0
Distributions paid to Parent									0.0	0.0
Proceeds from issuance of long-term debt											536.0
Funding between Parent and subsidiaries, net											0.0
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days									(1.6)	(127.0)	94.2
Repayment of debt									(531.7)	(376.5)	(530.8)
Debt issuance costs									(0.4)	(0.9)	(6.7)
Proceeds from exercise of options and warrants										1.3	7.1
Other financing activities									(10.9)	(11.4)	(12.2)
Cash flows provided by (used in) financing activities									(544.6)	(514.5)	87.6
(Decrease) increase in cash and cash equivalents									(50.5)	53.3	(19.0)
Cash and cash equivalents at beginning of year				57.9				4.6	57.9	4.6	23.6
Cash and cash equivalents at end of year	7.4				57.9				7.4	57.9	4.6
Parent Company [Member] | Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue									0.0	0.0	0.0
Operating costs and expenses									22.4	21.5	57.2
Operating income (loss)									(22.4)	(21.5)	(57.2)
Interest Income (Expense), Net									112.7	142.6	162.5
Other expense (income), net									19.5	17.6	28.2
Income (loss) before equity in earnings of subsidiaries and income taxes									(154.6)	(181.7)	(247.9)
Income tax expense (benefit)									(53.3)	(55.8)	(79.8)
Equity in earnings of subsidiaries, net of tax									455.0	201.5	113.4
Income (Loss) from Continuing Operations Attributable to Parent									353.7	75.6	(54.7)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.0	0.0	0.0
Net income (loss)									353.7	75.6	(54.7)
Other comprehensive income (loss)									3.3	(40.5)	76.5
Total comprehensive income (loss)									357.0	35.1	21.8
Preferred stock dividends									10.4	10.4	10.4
Net income (loss) applicable to common shareowners									343.3	65.2	(65.1)
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents	4.6			56.2	56.2			2.1	56.2	2.1	3.8	4.6		56.2	2.1	3.8
Receivables, net												0.7		2.6
Other current assets												1.6		1.3
Disposal Group, Including Discontinued Operation, Other Assets, Current														0.0
Total current assets												6.9		60.1
Property, plant and equipment, net												0.3		0.2
Investment in CyrusOne												0.0		0.0
Goodwill and intangibles, net												0.0		0.0
Investments in and advances to subsidiaries												844.6		1,066.1
Other noncurrent assets												214.4		297.6
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent														0.0
Total assets												1,066.2		1,424.0
Current portion of long-term debt												5.4		5.4
Accounts payable												0.7		1.0
Other current liabilities												41.6		52.3
Disposal Group, Including Discontinued Operation, Other Liabilities, Current												0.0		0.0
Liabilities, Current												47.7		58.7
Long-term debt, less current portion												1,025.8		1,526.1
Other Liabilities, Noncurrent												235.5		254.1
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent														0.0
Intercompany payables												54.7		233.4
Total liabilities												1,363.7		2,072.3
Stockholders' Equity Attributable to Parent												(297.5)		(648.3)
Total liabilities and shareowners' equity (deficit)												1,066.2		1,424.0
Condensed Consolidating Statements of Cash Flows [Abstract]
Cash flows (used in) provided by operating activities									(19.3)	(56.3)	(218.1)
Capital expenditures									(0.1)	(0.2)	0.0
Proceeds from Sale of Equity Method Investments									0.0	0.0
Dividends received from CyrusOne									0.0	0.0	0.0
Proceeds from sale of assets									0.0	0.0	0.0
Cash Divested from Deconsolidation											0.0
Distributions received from subsidiaries									11.3	12.8
Funding between Parent and subsidiaries, net investing									0.0	0.0
Distributions received from subsidiaries [Abstract]
Other investing activities									(0.3)	(0.3)	0.0
Cash flows provided by (used in) investing activities									10.9	12.3	0.0
Funding between Parent and subsidiaries, net financing									486.4	516.2
Distributions paid to Parent									0.0	0.0
Proceeds from issuance of long-term debt											536.0
Funding between Parent and subsidiaries, net											174.2
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days									0.0	(40.0)	40.0
Repayment of debt									(518.5)	(367.3)	(522.0)
Debt issuance costs									(0.2)	(0.7)	(6.7)
Proceeds from exercise of options and warrants										1.3	7.1
Other financing activities									(10.9)	(11.4)	(12.2)
Cash flows provided by (used in) financing activities									(43.2)	98.1	216.4
(Decrease) increase in cash and cash equivalents									(51.6)	54.1	(1.7)
Cash and cash equivalents at beginning of year				56.2				2.1	56.2	2.1	3.8
Cash and cash equivalents at end of year	4.6				56.2				4.6	56.2	2.1
Cincinnati Bell Telephone Company [Member] | Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue									660.1	659.6	644.2
Operating costs and expenses									538.6	488.0	463.1
Operating income (loss)									121.5	171.6	181.1
Interest Income (Expense), Net									(0.9)	(4.5)	(2.7)
Other expense (income), net									7.0	7.4	6.5
Income (loss) before equity in earnings of subsidiaries and income taxes									115.4	168.7	177.3
Income tax expense (benefit)									41.1	61.7	64.7
Equity in earnings of subsidiaries, net of tax									0.0	0.0	0.0
Income (Loss) from Continuing Operations Attributable to Parent									74.3	107.0	112.6
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.0	0.0	0.0
Net income (loss)									74.3	107.0	112.6
Other comprehensive income (loss)									0.0	0.0	0.0
Total comprehensive income (loss)									74.3	107.0	112.6
Preferred stock dividends									0.0	0.0	0.0
Net income (loss) applicable to common shareowners									74.3	107.0	112.6
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents	1.0			1.0	1.0			1.8	1.0	1.8	1.9	1.0		1.0	1.8	1.9
Receivables, net												0.0		1.0
Other current assets												20.2		16.3
Disposal Group, Including Discontinued Operation, Other Assets, Current														0.0
Total current assets												21.2		18.3
Property, plant and equipment, net												921.5		764.0
Investment in CyrusOne												0.0		0.0
Goodwill and intangibles, net												2.2		2.2
Investments in and advances to subsidiaries												63.9		220.8
Other noncurrent assets												3.8		4.9
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent														0.0
Total assets												1,012.6		1,010.2
Current portion of long-term debt												5.0		3.9
Accounts payable												84.8		73.8
Other current liabilities												45.3		52.8
Disposal Group, Including Discontinued Operation, Other Liabilities, Current												0.0		0.0
Liabilities, Current												135.1		130.5
Long-term debt, less current portion												135.1		141.2
Other Liabilities, Noncurrent												168.3		153.7
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent														0.0
Intercompany payables												0.0		0.0
Total liabilities												438.5		425.4
Stockholders' Equity Attributable to Parent												574.1		584.8
Total liabilities and shareowners' equity (deficit)												1,012.6		1,010.2
Condensed Consolidating Statements of Cash Flows [Abstract]
Cash flows (used in) provided by operating activities									198.7	226.3	236.4
Capital expenditures									(260.7)	(152.5)	(153.1)
Proceeds from Sale of Equity Method Investments									0.0	0.0
Dividends received from CyrusOne									0.0	0.0	0.0
Proceeds from sale of assets									0.1	0.3	2.0
Cash Divested from Deconsolidation											0.0
Distributions received from subsidiaries									0.0	0.0
Funding between Parent and subsidiaries, net investing									71.9	(71.0)
Distributions received from subsidiaries [Abstract]
Other investing activities									0.0	0.0	0.0
Cash flows provided by (used in) investing activities									(188.7)	(223.2)	(151.1)
Funding between Parent and subsidiaries, net financing									0.0	0.0
Distributions paid to Parent									0.0	0.0
Proceeds from issuance of long-term debt											0.0
Funding between Parent and subsidiaries, net											(81.7)
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days									0.0	0.0	0.0
Repayment of debt									(10.0)	(3.9)	(3.7)
Debt issuance costs									0.0	0.0	0.0
Proceeds from exercise of options and warrants										0.0	0.0
Other financing activities									0.0	0.0	0.0
Cash flows provided by (used in) financing activities									(10.0)	(3.9)	(85.4)
(Decrease) increase in cash and cash equivalents									0.0	(0.8)	(0.1)
Cash and cash equivalents at beginning of year				1.0				1.8	1.0	1.8	1.9
Cash and cash equivalents at end of year	1.0				1.0				1.0	1.0	1.8
Non-Guarantor Subsidiaries [Member] | Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue									546.3	541.0	467.5
Operating costs and expenses									517.4	514.2	451.6
Operating income (loss)									28.9	26.8	15.9
Interest Income (Expense), Net									(8.7)	7.8	16.2
Other expense (income), net									(452.2)	(193.1)	2.3
Income (loss) before equity in earnings of subsidiaries and income taxes									489.8	212.1	(2.6)
Income tax expense (benefit)									172.0	75.5	6.8
Equity in earnings of subsidiaries, net of tax									0.0	0.0	0.0
Income (Loss) from Continuing Operations Attributable to Parent									317.8	136.6	(9.4)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									62.9	(42.1)	10.2
Net income (loss)									380.7	94.5	0.8
Other comprehensive income (loss)									(0.4)	(0.1)	(0.1)
Total comprehensive income (loss)									380.3	94.4	0.7
Preferred stock dividends									0.0	0.0	0.0
Net income (loss) applicable to common shareowners									380.7	94.5	0.8
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents	1.8			0.7	0.7			0.7	0.7	0.7	17.9	1.8		0.7	0.7	17.9
Receivables, net												156.4		164.9
Other current assets												14.1		20.0
Disposal Group, Including Discontinued Operation, Other Assets, Current														4.7
Total current assets												172.3		190.3
Property, plant and equipment, net												53.7		51.2
Investment in CyrusOne												55.5		273.6
Goodwill and intangibles, net												12.3		12.7
Investments in and advances to subsidiaries												647.2		260.5
Other noncurrent assets												136.6		244.2
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent														44.6
Total assets												1,077.6		1,077.1
Current portion of long-term debt												3.4		2.3
Accounts payable												43.4		57.2
Other current liabilities												24.2		20.0
Disposal Group, Including Discontinued Operation, Other Liabilities, Current												5.4		142.0
Liabilities, Current												76.4		221.5
Long-term debt, less current portion												70.9		22.1
Other Liabilities, Noncurrent												4.0		1.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent														102.7
Intercompany payables												0.0		0.0
Total liabilities												151.3		348.2
Stockholders' Equity Attributable to Parent												926.3		728.9
Total liabilities and shareowners' equity (deficit)												1,077.6		1,077.1
Condensed Consolidating Statements of Cash Flows [Abstract]
Cash flows (used in) provided by operating activities									(68.5)	5.2	60.5
Capital expenditures									(22.8)	(29.6)	(43.8)
Proceeds from Sale of Equity Method Investments									643.9	355.9
Dividends received from CyrusOne									22.2	28.4	21.3
Proceeds from sale of assets									0.9	196.1	0.0
Cash Divested from Deconsolidation											(12.2)
Distributions received from subsidiaries									0.0	0.0
Funding between Parent and subsidiaries, net investing									(555.5)	(545.0)
Distributions received from subsidiaries [Abstract]
Other investing activities									0.0	(5.5)	0.4
Cash flows provided by (used in) investing activities									88.7	0.3	(34.3)
Funding between Parent and subsidiaries, net financing									(2.8)	99.8
Distributions paid to Parent									(11.3)	(12.8)
Proceeds from issuance of long-term debt											0.0
Funding between Parent and subsidiaries, net											(92.5)
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days									(1.6)	(87.0)	54.2
Repayment of debt									(3.2)	(5.3)	(5.1)
Debt issuance costs									(0.2)	(0.2)	0.0
Proceeds from exercise of options and warrants										0.0	0.0
Other financing activities									0.0	0.0	0.0
Cash flows provided by (used in) financing activities									(19.1)	(5.5)	(43.4)
(Decrease) increase in cash and cash equivalents									1.1	0.0	(17.2)
Cash and cash equivalents at beginning of year				0.7				0.7	0.7	0.7	17.9
Cash and cash equivalents at end of year	1.8				0.7				1.8	0.7	0.7
Consolidation, Eliminations [Member] | Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Revenue									(38.6)	(39.1)	(38.3)
Operating costs and expenses									(38.6)	(39.1)	(38.3)
Operating income (loss)									0.0	0.0	0.0
Interest Income (Expense), Net									0.0	0.0	0.0
Other expense (income), net									0.0	0.0	0.0
Income (loss) before equity in earnings of subsidiaries and income taxes									0.0	0.0	0.0
Income tax expense (benefit)									0.0	0.0	0.0
Equity in earnings of subsidiaries, net of tax									(455.0)	(201.5)	(113.4)
Income (Loss) from Continuing Operations Attributable to Parent									(455.0)	(201.5)	(113.4)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.0	0.0	0.0
Net income (loss)									(455.0)	(201.5)	(113.4)
Other comprehensive income (loss)									0.0	0.0	0.0
Total comprehensive income (loss)									(455.0)	(201.5)	(113.4)
Preferred stock dividends									0.0	0.0	0.0
Net income (loss) applicable to common shareowners									(455.0)	(201.5)	(113.4)
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents	0.0			0.0	0.0			0.0	0.0	0.0	0.0	0.0		0.0	$ 0.0	$ 0.0
Receivables, net												0.0		0.0
Other current assets												0.0		0.0
Disposal Group, Including Discontinued Operation, Other Assets, Current														0.0
Total current assets												0.0		0.0
Property, plant and equipment, net												0.0		0.0
Investment in CyrusOne												0.0		0.0
Goodwill and intangibles, net												0.0		0.0
Investments in and advances to subsidiaries												(1,555.7)		(1,547.4)
Other noncurrent assets												(146.3)		(143.2)
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent														0.0
Total assets												(1,702.0)		(1,690.6)
Current portion of long-term debt												0.0		0.0
Accounts payable												0.0		0.0
Other current liabilities												0.0		0.1
Disposal Group, Including Discontinued Operation, Other Liabilities, Current												0.0		0.0
Liabilities, Current												0.0		0.1
Long-term debt, less current portion												0.0		0.0
Other Liabilities, Noncurrent												(146.2)		(143.4)
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent														0.0
Intercompany payables												(54.7)		(233.4)
Total liabilities												(200.9)		(376.7)
Stockholders' Equity Attributable to Parent												(1,501.1)		(1,313.9)
Total liabilities and shareowners' equity (deficit)												(1,702.0)		(1,690.6)
Condensed Consolidating Statements of Cash Flows [Abstract]
Cash flows (used in) provided by operating activities									0.0	0.0	0.0
Capital expenditures									0.0	0.0	0.0
Proceeds from Sale of Equity Method Investments									0.0	0.0
Dividends received from CyrusOne									0.0	0.0	0.0
Proceeds from sale of assets									0.0	0.0	0.0
Cash Divested from Deconsolidation											0.0
Distributions received from subsidiaries									(11.3)	(12.8)
Funding between Parent and subsidiaries, net investing									483.6	616.0
Distributions received from subsidiaries [Abstract]
Other investing activities									0.0	0.0	0.0
Cash flows provided by (used in) investing activities									472.3	603.2	0.0
Funding between Parent and subsidiaries, net financing									(483.6)	(616.0)
Distributions paid to Parent									11.3	12.8
Proceeds from issuance of long-term debt											0.0
Funding between Parent and subsidiaries, net											0.0
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days									0.0	0.0	0.0
Repayment of debt									0.0	0.0	0.0
Debt issuance costs									0.0	0.0	0.0
Proceeds from exercise of options and warrants										0.0	0.0
Other financing activities									0.0	0.0	0.0
Cash flows provided by (used in) financing activities									(472.3)	(603.2)	0.0
(Decrease) increase in cash and cash equivalents									0.0	0.0	0.0
Cash and cash equivalents at beginning of year				0.0				$ 0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	$ 0.0				0.0				0.0	0.0	0.0
Various Cincinnati Bell Telephone Notes [Member]
Debt Instruments [Abstract]
Cincinnati Bell Telephone Notes Outstanding												$ 128.7		134.5
Continuing Operations [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Abstract]
Income tax expense (benefit)									159.8	81.4	(8.3)
Income (Loss) from Continuing Operations Attributable to Parent									290.8	117.7	(64.9)
Preferred stock dividends									10.4	10.4	10.4
Condensed Consolidating Balance Sheets [Abstract]
Other Liabilities, Noncurrent													$ 10.9	7.5
Total liabilities													$ 65.4	65.6
Condensed Consolidating Statements of Cash Flows [Abstract]
Capital expenditures									(283.6)	(175.8)	$ (180.9)
Continuing Operations [Member] | Notes guaranteed by parent [Member]
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents				57.9	57.9				57.9	57.9				57.9
Distributions received from subsidiaries [Abstract]
Cash and cash equivalents at beginning of year				57.9					57.9
Cash and cash equivalents at end of year					57.9					57.9
Continuing Operations [Member] | Non-Guarantor Subsidiaries [Member] | Notes guaranteed by parent [Member]
Condensed Consolidating Balance Sheets [Abstract]
Cash and cash equivalents				0.7	0.7				0.7	0.7				$ 0.7
Distributions received from subsidiaries [Abstract]
Cash and cash equivalents at beginning of year				$ 0.7					$ 0.7
Cash and cash equivalents at end of year					$ 0.7					$ 0.7