Name:	cbb_ChangeInAccountingEstimateEffectOfChangeOnBasicAndDilutedEarningsPerShare
Namespace Prefix:	cbb_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The increase in depreciation expense associated with a reduction in the useful lives of property, plant and equipment.

No definition available.

Name:	cbb_ChangeInAccountingEstimateEffectOfChangeOnOperatingResultsIncreaseInDepreciationExpense
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase in depreciation expense associated with a reduction in the useful lives of property, plant and equipment, net of tax.

No definition available.

Name:	cbb_ChangeInAccountingEstimateEffectOfChangeOnOperatingResultsIncreaseInDepreciationExpenseNetOfTax
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	cbb_DescriptionOfAccountingPoliciesLineItems
Namespace Prefix:	cbb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The Company's ownership interest, in shares, in the common stock of CyrusOne Inc., the publicly-traded real estate investment trust entity, following the completion of the initial public offering on January 24, 2013.

No definition available.

Name:	cbb_InvestmentOwnedInCyrusoneIncBalanceShares
Namespace Prefix:	cbb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The Company's ownership interest in CyrusOne Inc., the publicly-traded real estate investment trust entity, following the completion of the initial public offering on January 24, 2013.

No definition available.

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

The number of partnership units of CyrusOne LP, the operating partnership, owned by the Company. These partnership units are exchangeable into shares of common stock of CyrusOne Inc. on a one-for-one basis.

No definition available.

Name:	cbb_InvestmentOwnedInCyrusoneLpBalancePartnershipUnits
Namespace Prefix:	cbb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The company's percentage ownership interest in CyrusOne LP, the operating partnership, after the initial public offering of CyrusOne Inc. on January 24, 2013.

No definition available.

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

The Company's total combined direct and indirect owership interests in CyrusOne Inc., the REIT entity, and CyrusOne LP, the operating partnership.

No definition available.

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

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.