Description of Business and Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Entity Number of Employees	3,300
Company Employees Participating in Collective Bargaining Agreement, Percentage	30.00%
Number of customers that exceed 10% of total accounts receivable	1
Accounts Receivable from customers greater than 10%, percentage	22.00%		22.00%
Revenue from customers greater than 10%, percentage	11.00%	12.00%
Restructuring Reserve, Current	$ 0.9		$ 0.9
Restructuring Reserve, Noncurrent	$ 0.2		0.2
Debt Issuance Costs Reclassified			$ 8.0

Accounts Receivable from customers greater than 10%, percentage

No definition available.

Name:	cbb_AccountsReceivablefromcustomersgreaterthan10percentage
Namespace Prefix:	cbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Company Employees Participating in Collective Bargaining Agreement, Percentage

+ References

No definition available.

+ Details

Name:	cbb_CompanyEmployeesParticipatinginCollectiveBargainingAgreementPercentage
Namespace Prefix:	cbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt issuance costs reclassified from "Other non-current assets" to "Long term debt, less current portion" pursuant to the issuance of ASU 2015-03 by FASB in April 2015.

+ References

No definition available.

+ Details

Name:	cbb_DebtIssuanceCostsReclassified
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of customers that exceed 10% of total accounts receivable

+ References

No definition available.

+ Details

Name:	cbb_Numberofcustomersthatexceed10oftotalaccountsreceivable
Namespace Prefix:	cbb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Revenue from customers greater than 10%, percentage

+ References

No definition available.

+ Details

Name:	cbb_Revenuefromcustomersgreaterthan10percentage
Namespace Prefix:	cbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

Name:	dei_EntityNumberOfEmployees
Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_RestructuringReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_RestructuringReserveNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant