Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2013	Dec. 31, 2012
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		$ 292.9	$ 282.2
Operating costs and expenses		255.8	231.8
Operating income (loss)		37.1	50.4
Interest expense (income), net		32.7	38.8
Other expense (income), net		0.4	(0.3)
Income (loss) before equity in earnings of subsidiaries and income taxes		0.9	12.4
Income tax expense (benefit)		0.6	6.5
Income (loss) from continuing operations		0.3	5.9
Income (loss) from discontinued operations		48.9	1.1
Net income (loss)		49.2	7.0
Total comprehensive income (loss)		50.6	8.8
Preferred stock dividends		2.6	2.6
Net income (loss) applicable to common shareowners		46.6	4.4
Condensed Consolidating Balance Sheets
Cash and cash equivalents		13.4			4.2	4.6
Other current assets		3.5		1.8
Other current assets from discontinued operations		0.4		4.7
Total current assets		325.7		337.6
Property, plant and equipment, net		845.7		815.4
Investment in CyrusOne		261.5		273.6
Other noncurrent assets		32.4		33.9
Other noncurrent assets from discontinued operations		16.0		44.6
Total assets		1,733.0		1,820.7
Current portion of long-term debt		12.6		11.6
Accounts payable		111.8		131.6
Other current liabilities		25.9		25.8
Other current liabilities from discontinued operations		26.5		142.0
Total current liabilities		279.4		410.8
Long-term debt, less current portion		1,748.8		1,689.4
Other noncurrent liabilities		39.3		26.2
Total liabilities		2,332.6		2,469.2
Shareowners' (deficit) equity		(599.6)		(648.5)
Total liabilities and shareowners' equity (deficit)		1,733.0		1,820.7
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		6.3	37.8
Capital expenditures		(57.9)	(34.3)
Proceeds from sale of assets		0	1.9
Dividends received from CyrusOne		6.0	7.1
Other investing activities		(0.1)	0
Cash flows provided by (used in) investing activities		(52.0)	(25.3)
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		7.5	(4.1)
Repayment of debt		(3.3)	(5.2)
Proceeds from exercise of options and warrants		0	0.6
Other financing activities		(0.6)	(1.7)
Cash flows provided by (used in) financing activities		1.2	(12.9)
Increase (decrease) in cash and cash equivalents		(44.5)	(0.4)
Cash and cash equivalents at beginning of period	13.4	57.9			4.2	4.6
Cash and cash equivalents at end of period		13.4			4.2	4.6
Debt Instrument, Redemption Price, Percentage	102.188%
Notes guaranteed by parent [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		292.9	282.2
Operating costs and expenses		255.8	231.8
Operating income (loss)		37.1	50.4
Interest expense (income), net		32.7	38.8
Other expense (income), net		3.5	(0.8)
Income (loss) before equity in earnings of subsidiaries and income taxes		0.9	12.4
Income tax expense (benefit)		0.6	6.5
Equity in earnings of subsidiaries, net of tax		0	0
Income (loss) from continuing operations		0.3	5.9
Income (loss) from discontinued operations		48.9	1.1
Net income (loss)		49.2	7.0
Other comprehensive income (loss)		1.4	1.8
Total comprehensive income (loss)		50.6	8.8
Preferred stock dividends		2.6	2.6
Net income (loss) applicable to common shareowners		46.6	4.4
Condensed Consolidating Balance Sheets
Cash and cash equivalents		13.4	4.2
Receivables, net		170.3		168.5
Other current assets		141.6		106.5
Other current assets from discontinued operations		0.4		4.7
Total current assets		325.7		337.6
Property, plant and equipment, net		845.7		815.4
Investment in CyrusOne		261.5		273.6
Goodwill and intangibles, net		14.8		14.9
Investments in and advances to subsidiaries		0		0
Other noncurrent assets		269.3		334.6
Other noncurrent assets from discontinued operations		16.0		44.6
Total assets		1,733.0		1,820.7
Current portion of long-term debt		12.6		11.6
Accounts payable		113.1		132.0
Other current liabilities		127.2		125.2
Other current liabilities from discontinued operations		26.5		142.0
Total current liabilities		279.4		410.8
Long-term debt, less current portion		1,748.8		1,689.4
Other noncurrent liabilities		273.2		266.3
Other noncurrent liabilities from discontinued operations		31.2		102.7
Intercompany payables		0		0
Total liabilities		2,332.6		2,469.2
Shareowners' (deficit) equity		(599.6)		(648.5)
Total liabilities and shareowners' equity (deficit)		1,733.0		1,820.7
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		6.3	37.8
Capital expenditures		(57.9)	(34.3)
Proceeds from sale of assets			1.9
Dividends received from CyrusOne		6.0	7.1
Distributions Received from Subsidiaries		0
Funding Between Parent and Subsidiaries, net investing		0
Other investing activities		(0.1)
Cash flows provided by (used in) investing activities		(52.0)	(25.3)
Funding between Parent and subsidiaries, net financing		0
Funding between Parent and subsidiaries, net			0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		7.5	(4.1)
Repayment of debt		(3.3)	(5.2)
Proceeds from exercise of options and warrants			0.6
Other financing activities		(3.0)	(4.2)
Cash flows provided by (used in) financing activities		1.2	(12.9)
Increase (decrease) in cash and cash equivalents		(44.5)	(0.4)
Cash and cash equivalents at beginning of period		57.9	4.6
Cash and cash equivalents at end of period		13.4	4.2
Notes guaranteed by parent [Member] | Parent Company [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		0	0
Operating costs and expenses		5.3	6.5
Operating income (loss)		(5.3)	(6.5)
Interest expense (income), net		33.9	36.7
Other expense (income), net		(0.4)	(0.3)
Income (loss) before equity in earnings of subsidiaries and income taxes		(38.8)	(42.9)
Income tax expense (benefit)		(14.1)	(13.2)
Equity in earnings of subsidiaries, net of tax		73.9	36.7
Income (loss) from continuing operations		49.2	7.0
Income (loss) from discontinued operations		0	0
Net income (loss)		49.2	7.0
Other comprehensive income (loss)		1.7	1.8
Total comprehensive income (loss)		50.9	8.8
Preferred stock dividends		2.6	2.6
Net income (loss) applicable to common shareowners		46.6	4.4
Condensed Consolidating Balance Sheets
Cash and cash equivalents		10.6	1.9
Receivables, net		1.4		2.6
Other current assets		45.2		4.7
Other current assets from discontinued operations		0		0
Total current assets		57.2		63.5
Property, plant and equipment, net		0.3		0.2
Investment in CyrusOne		0		0
Goodwill and intangibles, net		0		0
Investments in and advances to subsidiaries		1,135.3		1,061.2
Other noncurrent assets		255.6		294.2
Other noncurrent assets from discontinued operations		0		0
Total assets		1,448.4		1,419.1
Current portion of long-term debt		5.4		5.4
Accounts payable		0.6		1.0
Other current liabilities		58.2		52.3
Other current liabilities from discontinued operations		0		0
Total current liabilities		64.2		58.7
Long-term debt, less current portion		1,524.9		1,526.1
Other noncurrent liabilities		247.3		254.1
Other noncurrent liabilities from discontinued operations		0		0
Intercompany payables		211.0		228.5
Total liabilities		2,047.4		2,067.4
Shareowners' (deficit) equity		(599.0)		(648.3)
Total liabilities and shareowners' equity (deficit)		1,448.4		1,419.1
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		(23.5)	(28.2)
Capital expenditures		0	0
Proceeds from sale of assets			0
Dividends received from CyrusOne		0	0
Distributions Received from Subsidiaries		2.7
Funding Between Parent and Subsidiaries, net investing		0
Other investing activities		(0.1)
Cash flows provided by (used in) investing activities		2.6	0
Funding between Parent and subsidiaries, net financing		(20.4)
Funding between Parent and subsidiaries, net			(35.4)
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		0	(2.5)
Repayment of debt		(1.3)	(1.3)
Proceeds from exercise of options and warrants			0.6
Other financing activities		(3.0)	(4.2)
Cash flows provided by (used in) financing activities		(24.7)	28.0
Increase (decrease) in cash and cash equivalents		(45.6)	(0.2)
Cash and cash equivalents at beginning of period		56.2	2.1
Cash and cash equivalents at end of period		10.6	1.9
Notes guaranteed by parent [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		135.0	128.9
Operating costs and expenses		131.3	121.6
Operating income (loss)		3.7	7.3
Interest expense (income), net		(0.4)	2.9
Other expense (income), net		2.0	(2.4)
Income (loss) before equity in earnings of subsidiaries and income taxes		2.1	6.8
Income tax expense (benefit)		0.9	1.8
Equity in earnings of subsidiaries, net of tax		0	0
Income (loss) from continuing operations		1.2	5.0
Income (loss) from discontinued operations		48.9	1.1
Net income (loss)		50.1	6.1
Other comprehensive income (loss)		(0.3)	0
Total comprehensive income (loss)		49.8	6.1
Preferred stock dividends		0	0
Net income (loss) applicable to common shareowners		50.1	6.1
Condensed Consolidating Balance Sheets
Cash and cash equivalents		1.6	1.5
Receivables, net		167.9		164.9
Other current assets		66.0		73.7
Other current assets from discontinued operations		0.4		4.7
Total current assets		235.9		244.0
Property, plant and equipment, net		51.9		51.2
Investment in CyrusOne		261.5		273.6
Goodwill and intangibles, net		12.6		12.7
Investments in and advances to subsidiaries		55.5		250.0
Other noncurrent assets		159.3		190.5
Other noncurrent assets from discontinued operations		16.0		44.6
Total assets		792.7		1,066.6
Current portion of long-term debt		3.4		2.3
Accounts payable		40.5		57.2
Other current liabilities		22.7		20.0
Other current liabilities from discontinued operations		26.5		142.0
Total current liabilities		93.1		221.5
Long-term debt, less current portion		82.5		22.1
Other noncurrent liabilities		11.8		1.9
Other noncurrent liabilities from discontinued operations		31.2		102.7
Intercompany payables		0		0
Total liabilities		218.6		348.2
Shareowners' (deficit) equity		574.1		718.4
Total liabilities and shareowners' equity (deficit)		792.7		1,066.6
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		(5.9)	14.1
Capital expenditures		(6.1)	(11.7)
Proceeds from sale of assets			1.8
Dividends received from CyrusOne		6.0	7.1
Distributions Received from Subsidiaries		0
Funding Between Parent and Subsidiaries, net investing		10.9
Other investing activities		0
Cash flows provided by (used in) investing activities		10.8	(2.8)
Funding between Parent and subsidiaries, net financing		(7.8)
Funding between Parent and subsidiaries, net			6.0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		(2.7)
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		7.5	(1.6)
Repayment of debt		(1.0)	(2.9)
Proceeds from exercise of options and warrants			0
Other financing activities		0	0
Cash flows provided by (used in) financing activities		(4.0)	(10.5)
Increase (decrease) in cash and cash equivalents		0.9	0.8
Cash and cash equivalents at beginning of period		0.7	0.7
Cash and cash equivalents at end of period		1.6	1.5
Notes guaranteed by parent [Member] | Cincinnati Bell Telephone Company [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		167.6	163.3
Operating costs and expenses		128.9	113.7
Operating income (loss)		38.7	49.6
Interest expense (income), net		(0.8)	(0.8)
Other expense (income), net		1.9	1.9
Income (loss) before equity in earnings of subsidiaries and income taxes		37.6	48.5
Income tax expense (benefit)		13.8	17.9
Equity in earnings of subsidiaries, net of tax		0	0
Income (loss) from continuing operations		23.8	30.6
Income (loss) from discontinued operations		0	0
Net income (loss)		23.8	30.6
Other comprehensive income (loss)		0	0
Total comprehensive income (loss)		23.8	30.6
Preferred stock dividends		0	0
Net income (loss) applicable to common shareowners		23.8	30.6
Condensed Consolidating Balance Sheets
Cash and cash equivalents		1.2	0.8
Receivables, net		1.0		1.0
Other current assets		32.0		29.3
Other current assets from discontinued operations		0		0
Total current assets		34.2		31.3
Property, plant and equipment, net		793.5		764.0
Investment in CyrusOne		0		0
Goodwill and intangibles, net		2.2		2.2
Investments in and advances to subsidiaries		213.6		230.8
Other noncurrent assets		4.5		4.9
Other noncurrent assets from discontinued operations		0		0
Total assets		1,048.0		1,033.2
Current portion of long-term debt		3.8		3.9
Accounts payable		72.0		73.8
Other current liabilities		46.3		52.8
Other current liabilities from discontinued operations		0		0
Total current liabilities		122.1		130.5
Long-term debt, less current portion		141.4		141.2
Other noncurrent liabilities		165.8		166.7
Other noncurrent liabilities from discontinued operations		0		0
Intercompany payables		0		0
Total liabilities		429.3		438.4
Shareowners' (deficit) equity		618.7		594.8
Total liabilities and shareowners' equity (deficit)		1,048.0		1,033.2
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		35.7	51.9
Capital expenditures		(51.8)	(22.6)
Proceeds from sale of assets			0.1
Dividends received from CyrusOne		0	0
Distributions Received from Subsidiaries		0
Funding Between Parent and Subsidiaries, net investing		17.3
Other investing activities		0
Cash flows provided by (used in) investing activities		(34.5)	(22.5)
Funding between Parent and subsidiaries, net financing		0
Funding between Parent and subsidiaries, net			29.4
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		0	0
Repayment of debt		(1.0)	(1.0)
Proceeds from exercise of options and warrants			0
Other financing activities		0	0
Cash flows provided by (used in) financing activities		(1.0)	(30.4)
Increase (decrease) in cash and cash equivalents		0.2	(1.0)
Cash and cash equivalents at beginning of period		1.0	1.8
Cash and cash equivalents at end of period		1.2	0.8
Notes guaranteed by parent [Member] | Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		(9.7)	(10.0)
Operating costs and expenses		(9.7)	(10.0)
Operating income (loss)		0	0
Interest expense (income), net		0	0
Other expense (income), net		0	0
Income (loss) before equity in earnings of subsidiaries and income taxes		0	0
Income tax expense (benefit)		0	0
Equity in earnings of subsidiaries, net of tax		(73.9)	(36.7)
Income (loss) from continuing operations		(73.9)	(36.7)
Income (loss) from discontinued operations		0	0
Net income (loss)		(73.9)	(36.7)
Other comprehensive income (loss)		0	0
Total comprehensive income (loss)		(73.9)	(36.7)
Preferred stock dividends		0	0
Net income (loss) applicable to common shareowners		(73.9)	(36.7)
Condensed Consolidating Balance Sheets
Cash and cash equivalents		0	0
Receivables, net		0		0
Other current assets		(1.6)		(1.2)
Other current assets from discontinued operations		0		0
Total current assets		(1.6)		(1.2)
Property, plant and equipment, net		0		0
Investment in CyrusOne		0		0
Goodwill and intangibles, net		0		0
Investments in and advances to subsidiaries		(1,404.4)		(1,542.0)
Other noncurrent assets		(150.1)		(155.0)
Other noncurrent assets from discontinued operations		0		0
Total assets		(1,556.1)		(1,698.2)
Current portion of long-term debt		0		0
Accounts payable		0		0
Other current liabilities		0		0.1
Other current liabilities from discontinued operations		0		0
Total current liabilities		0		0.1
Long-term debt, less current portion		0		0
Other noncurrent liabilities		(151.7)		(156.4)
Other noncurrent liabilities from discontinued operations		0		0
Intercompany payables		(211.0)		(228.5)
Total liabilities		(362.7)		(384.8)
Shareowners' (deficit) equity		(1,193.4)		(1,313.4)
Total liabilities and shareowners' equity (deficit)		(1,556.1)		(1,698.2)
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		0	0
Capital expenditures		0	0
Proceeds from sale of assets			0
Dividends received from CyrusOne		0	0
Distributions Received from Subsidiaries		(2.7)
Funding Between Parent and Subsidiaries, net investing		(28.2)
Other investing activities		0
Cash flows provided by (used in) investing activities		(30.9)	0
Funding between Parent and subsidiaries, net financing		28.2
Funding between Parent and subsidiaries, net			0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		2.7
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		0	0
Repayment of debt		0	0
Proceeds from exercise of options and warrants			0
Other financing activities		0	0
Cash flows provided by (used in) financing activities		30.9	0
Increase (decrease) in cash and cash equivalents		0	0
Cash and cash equivalents at beginning of period		0	0
Cash and cash equivalents at end of period		0	0
Notes guaranteed by subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		292.9	282.2
Operating costs and expenses		255.8	231.8
Operating income (loss)		37.1	50.4
Interest expense (income), net		32.7	38.8
Other expense (income), net		3.5	(0.8)
Income (loss) before equity in earnings of subsidiaries and income taxes		0.9	12.4
Income tax expense (benefit)		0.6	6.5
Equity in earnings of subsidiaries, net of tax		0	0
Income (loss) from continuing operations		0.3	5.9
Income (loss) from discontinued operations		48.9	1.1
Net income (loss)		49.2	7.0
Other comprehensive income (loss)		1.4	1.8
Total comprehensive income (loss)		50.6	8.8
Preferred stock dividends		2.6	2.6
Net income (loss) applicable to common shareowners		46.6	4.4
Condensed Consolidating Balance Sheets
Cash and cash equivalents		13.4	4.2
Receivables, net		170.3		168.5
Other current assets		141.6		106.5
Other current assets from discontinued operations		0.4		4.7
Total current assets		325.7		337.6
Property, plant and equipment, net		845.7		815.4
Investment in CyrusOne		261.5		273.6
Goodwill and intangibles, net		14.8		14.9
Investments in and advances to subsidiaries		0		0
Other noncurrent assets		269.3		334.6
Other noncurrent assets from discontinued operations		16.0		44.6
Total assets		1,733.0		1,820.7
Current portion of long-term debt		12.6		11.6
Accounts payable		113.1		132.0
Other current liabilities		127.2		125.2
Other current liabilities from discontinued operations		26.5		142.0
Total current liabilities		279.4		410.8
Long-term debt, less current portion		1,748.8		1,689.4
Other noncurrent liabilities		273.2		266.3
Other noncurrent liabilities from discontinued operations		31.2		102.7
Intercompany payables		0		0
Total liabilities		2,332.6		2,469.2
Shareowners' (deficit) equity		(599.6)		(648.5)
Total liabilities and shareowners' equity (deficit)		1,733.0		1,820.7
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		6.3	37.8
Capital expenditures		(57.9)	(34.3)
Proceeds from sale of assets			1.9
Dividends received from CyrusOne		6.0	7.1
Distributions Received from Subsidiaries		0
Funding Between Parent and Subsidiaries, net investing		0
Other investing activities		0.1
Cash flows provided by (used in) investing activities		(52.0)	(25.3)
Funding between Parent and subsidiaries, net financing		0
Funding between Parent and subsidiaries, net			0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		7.5	(4.1)
Repayment of debt		(3.3)	(5.2)
Proceeds from exercise of options and warrants			0.6
Other financing activities		(3.0)	(4.2)
Cash flows provided by (used in) financing activities		1.2	(12.9)
Increase (decrease) in cash and cash equivalents		(44.5)	(0.4)
Cash and cash equivalents at beginning of period		57.9	4.6
Cash and cash equivalents at end of period		13.4	4.2
Notes guaranteed by subsidiaries [Member] | Parent Company [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		0	0
Operating costs and expenses		5.3	6.5
Operating income (loss)		(5.3)	(6.5)
Interest expense (income), net		33.9	36.7
Other expense (income), net		(0.4)	(0.3)
Income (loss) before equity in earnings of subsidiaries and income taxes		(38.8)	(42.9)
Income tax expense (benefit)		(14.1)	(13.2)
Equity in earnings of subsidiaries, net of tax		73.9	36.7
Income (loss) from continuing operations		49.2	7.0
Income (loss) from discontinued operations		0	0
Net income (loss)		49.2	7.0
Other comprehensive income (loss)		1.7	1.8
Total comprehensive income (loss)		50.9	8.8
Preferred stock dividends		2.6	2.6
Net income (loss) applicable to common shareowners		46.6	4.4
Condensed Consolidating Balance Sheets
Cash and cash equivalents		10.6	1.9
Receivables, net		1.4		2.6
Other current assets		45.2		4.7
Other current assets from discontinued operations		0		0
Total current assets		57.2		63.5
Property, plant and equipment, net		0.3		0.2
Investment in CyrusOne		0		0
Goodwill and intangibles, net		0		0
Investments in and advances to subsidiaries		1,135.3		1,061.2
Other noncurrent assets		255.6		294.2
Other noncurrent assets from discontinued operations		0		0
Total assets		1,448.4		1,419.1
Current portion of long-term debt		5.4		5.4
Accounts payable		0.6		1.0
Other current liabilities		58.2		52.3
Other current liabilities from discontinued operations		0		0
Total current liabilities		64.2		58.7
Long-term debt, less current portion		1,524.9		1,526.1
Other noncurrent liabilities		247.3		254.1
Other noncurrent liabilities from discontinued operations		0		0
Intercompany payables		211.0		228.5
Total liabilities		2,047.4		2,067.4
Shareowners' (deficit) equity		(599.0)		(648.3)
Total liabilities and shareowners' equity (deficit)		1,448.4		1,419.1
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		(23.5)	(28.2)
Capital expenditures		0	0
Proceeds from sale of assets			0
Dividends received from CyrusOne		0	0
Distributions Received from Subsidiaries		(2.7)
Funding Between Parent and Subsidiaries, net investing		0
Other investing activities		(0.1)
Cash flows provided by (used in) investing activities		2.6	0
Funding between Parent and subsidiaries, net financing		20.4
Funding between Parent and subsidiaries, net			(35.4)
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		0	(2.5)
Repayment of debt		(1.3)	(1.3)
Proceeds from exercise of options and warrants			0.6
Other financing activities		(3.0)	(4.2)
Cash flows provided by (used in) financing activities		(24.7)	28.0
Increase (decrease) in cash and cash equivalents		(45.6)	(0.2)
Cash and cash equivalents at beginning of period		56.2	2.1
Cash and cash equivalents at end of period		10.6	1.9
Notes guaranteed by subsidiaries [Member] | Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		152.9	142.4
Operating costs and expenses		147.3	133.5
Operating income (loss)		5.6	8.9
Interest expense (income), net		(0.7)	2.5
Other expense (income), net		6.1	2.6
Income (loss) before equity in earnings of subsidiaries and income taxes		0.2	3.8
Income tax expense (benefit)		0	1.2
Equity in earnings of subsidiaries, net of tax		0	0
Income (loss) from continuing operations		0.2	2.6
Income (loss) from discontinued operations		48.9	1.1
Net income (loss)		49.1	3.7
Other comprehensive income (loss)		0	0
Total comprehensive income (loss)		49.1	3.7
Preferred stock dividends		0	0
Net income (loss) applicable to common shareowners		49.1	3.7
Condensed Consolidating Balance Sheets
Cash and cash equivalents		0.3	1.1
Receivables, net		9.0		6.1
Other current assets		63.4		69.9
Other current assets from discontinued operations		0.4		4.7
Total current assets		73.1		80.9
Property, plant and equipment, net		51.5		50.8
Investment in CyrusOne		261.5		273.6
Goodwill and intangibles, net		12.6		12.7
Investments in and advances to subsidiaries		181.5		393.1
Other noncurrent assets		160.3		191.6
Other noncurrent assets from discontinued operations		16.0		44.6
Total assets		756.5		1,047.3
Current portion of long-term debt		3.4		2.3
Accounts payable		55.8		76.2
Other current liabilities		24.3		23.5
Other current liabilities from discontinued operations		26.5		142.0
Total current liabilities		110.0		244.0
Long-term debt, less current portion		55.8		2.9
Other noncurrent liabilities		8.8		4.6
Other noncurrent liabilities from discontinued operations		31.2		102.7
Intercompany payables		0		0
Total liabilities		205.8		354.2
Shareowners' (deficit) equity		550.7		693.1
Total liabilities and shareowners' equity (deficit)		756.5		1,047.3
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		(19.2)	25.6
Capital expenditures		(6.1)	(11.7)
Proceeds from sale of assets			0
Dividends received from CyrusOne		6.0	(7.1)
Distributions Received from Subsidiaries		0
Funding Between Parent and Subsidiaries, net investing		(20.4)
Other investing activities		0
Cash flows provided by (used in) investing activities		20.3	(4.6)
Funding between Parent and subsidiaries, net financing		0
Funding between Parent and subsidiaries, net			19.5
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		0	0
Repayment of debt		(1.0)	(0.7)
Proceeds from exercise of options and warrants			0
Other financing activities		0	0
Cash flows provided by (used in) financing activities		(1.0)	(20.2)
Increase (decrease) in cash and cash equivalents		0.1	0.8
Cash and cash equivalents at beginning of period		0.2	0.3
Cash and cash equivalents at end of period		0.3	1.1
Notes guaranteed by subsidiaries [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		149.7	149.8
Operating costs and expenses		112.9	101.8
Operating income (loss)		36.8	48.0
Interest expense (income), net		(0.5)	(0.4)
Other expense (income), net		(2.2)	(3.1)
Income (loss) before equity in earnings of subsidiaries and income taxes		39.5	51.5
Income tax expense (benefit)		14.7	18.5
Equity in earnings of subsidiaries, net of tax		0	0
Income (loss) from continuing operations		24.8	33.0
Income (loss) from discontinued operations		0	0
Net income (loss)		24.8	33.0
Other comprehensive income (loss)		(0.3)	0
Total comprehensive income (loss)		24.5	33.0
Preferred stock dividends		0	0
Net income (loss) applicable to common shareowners		24.8	33.0
Condensed Consolidating Balance Sheets
Cash and cash equivalents		2.5	1.2
Receivables, net		159.9		159.8
Other current assets		34.6		33.1
Other current assets from discontinued operations		0		0
Total current assets		197.0		194.4
Property, plant and equipment, net		793.9		764.4
Investment in CyrusOne		0		0
Goodwill and intangibles, net		2.2		2.2
Investments in and advances to subsidiaries		206.3		209.3
Other noncurrent assets		3.5		3.8
Other noncurrent assets from discontinued operations		0		0
Total assets		1,202.9		1,174.1
Current portion of long-term debt		3.8		3.9
Accounts payable		56.7		54.8
Other current liabilities		44.7		49.3
Other current liabilities from discontinued operations		0		0
Total current liabilities		105.2		108.0
Long-term debt, less current portion		168.1		160.4
Other noncurrent liabilities		168.8		164.0
Other noncurrent liabilities from discontinued operations		0		0
Intercompany payables		128.1		131.9
Total liabilities		570.2		564.3
Shareowners' (deficit) equity		632.7		609.8
Total liabilities and shareowners' equity (deficit)		1,202.9		1,174.1
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		49.0	40.4
Capital expenditures		(51.8)	(22.6)
Proceeds from sale of assets			1.9
Dividends received from CyrusOne		0	0
Distributions Received from Subsidiaries		0
Funding Between Parent and Subsidiaries, net investing		7.2
Other investing activities		0
Cash flows provided by (used in) investing activities		(44.6)	(20.7)
Funding between Parent and subsidiaries, net financing		7.2
Funding between Parent and subsidiaries, net			15.9
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		(2.7)
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		7.5	(1.6)
Repayment of debt		(1.0)	(3.2)
Proceeds from exercise of options and warrants			0
Other financing activities		0	0
Cash flows provided by (used in) financing activities		(3.4)	(20.7)
Increase (decrease) in cash and cash equivalents		1.0	(1.0)
Cash and cash equivalents at beginning of period		1.5	2.2
Cash and cash equivalents at end of period		2.5	1.2
Notes guaranteed by subsidiaries [Member] | Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
Revenue		(9.7)	(10.0)
Operating costs and expenses		(9.7)	(10.0)
Operating income (loss)		0	0
Interest expense (income), net		0	0
Other expense (income), net		0	0
Income (loss) before equity in earnings of subsidiaries and income taxes		0	0
Income tax expense (benefit)		0	0
Equity in earnings of subsidiaries, net of tax		(73.9)	(36.7)
Income (loss) from continuing operations		(73.9)	(36.7)
Income (loss) from discontinued operations		0	0
Net income (loss)		(73.9)	(36.7)
Other comprehensive income (loss)		0	0
Total comprehensive income (loss)		(73.9)	(36.7)
Preferred stock dividends		0	0
Net income (loss) applicable to common shareowners		(73.9)	(36.7)
Condensed Consolidating Balance Sheets
Cash and cash equivalents		0	0
Receivables, net		0		0
Other current assets		(1.6)		(1.2)
Other current assets from discontinued operations		0		0
Total current assets		(1.6)		(1.2)
Property, plant and equipment, net		0		0
Investment in CyrusOne		0		0
Goodwill and intangibles, net		0		0
Investments in and advances to subsidiaries		(1,523.1)		(1,663.6)
Other noncurrent assets		(150.1)		(155.0)
Other noncurrent assets from discontinued operations		0		0
Total assets		(1,674.8)		(1,819.8)
Current portion of long-term debt		0		0
Accounts payable		0		0
Other current liabilities		0		0.1
Other current liabilities from discontinued operations		0		0
Total current liabilities		0		0.1
Long-term debt, less current portion		0		0
Other noncurrent liabilities		(151.7)		(156.4)
Other noncurrent liabilities from discontinued operations		0		0
Intercompany payables		(339.1)		(360.4)
Total liabilities		(490.8)		(516.7)
Shareowners' (deficit) equity		(1,184.0)		(1,303.1)
Total liabilities and shareowners' equity (deficit)		(1,674.8)		(1,819.8)
Condensed Consolidating Statements of Cash Flows
Cash flows provided by (used in) operating activities		0	0
Capital expenditures		0	0
Proceeds from sale of assets			0
Dividends received from CyrusOne		0	0
Distributions Received from Subsidiaries		2.7
Funding Between Parent and Subsidiaries, net investing		27.6
Other investing activities		0
Cash flows provided by (used in) investing activities		(30.3)	0
Funding between Parent and subsidiaries, net financing		(27.6)
Funding between Parent and subsidiaries, net			0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries		(2.7)
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days		0	0
Repayment of debt		0	0
Proceeds from exercise of options and warrants			0
Other financing activities		0	0
Cash flows provided by (used in) financing activities		30.3	0
Increase (decrease) in cash and cash equivalents		0	0
Cash and cash equivalents at beginning of period		0	0
Cash and cash equivalents at end of period		0	0
Various Cincinnati Bell Telephone Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount		134.5		134.5
Senior Subordinated Notes due 2018 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 300.0	$ 300.0		$ 300.0