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Debt and Other Financing Arrangements Long-Term Debt and Other (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 1993
Nov. 30, 1998
Sep. 30, 2014
Dec. 31, 2012
Dec. 31, 2015
Oct. 15, 2013
Jan. 24, 2013
Debt Instrument [Line Items]                          
Proceeds from issuance of long-term debt     $ 0us-gaap_ProceedsFromIssuanceOfLongTermDebt $ 536.0us-gaap_ProceedsFromIssuanceOfLongTermDebt $ 525.0us-gaap_ProceedsFromIssuanceOfLongTermDebt                
Debt Instrument, Redemption Price, Percentage   104.125%us-gaap_DebtInstrumentRedemptionPricePercentage                      
Line of Credit Facility, Maximum Borrowing Capacity                     125.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Equity Method Investment Sold, Partnership Units 16.0cbb_EquityMethodInvestmentSoldPartnershipUnits                        
Proceeds from sale of CyrusOne equity method investment 355.9us-gaap_ProceedsFromSaleOfEquityMethodInvestments   355.9us-gaap_ProceedsFromSaleOfEquityMethodInvestments 0us-gaap_ProceedsFromSaleOfEquityMethodInvestments 0us-gaap_ProceedsFromSaleOfEquityMethodInvestments                
Line of Credit Facility, Amount Outstanding   40.0us-gaap_LineOfCredit 0us-gaap_LineOfCredit 40.0us-gaap_LineOfCredit                  
Repayments of Long-term Debt [Abstract]                          
Long-Term Debt, Excluding Capital Leases, Current     6.0cbb_LongTermDebtExcludingCapitalLeasesCurrent                    
Long-Term Debt, Excluding Capital Leases, Repayments of Principal in Year Two     25.1cbb_LongTermDebtExcludingCapitalLeasesRepaymentsOfPrincipalInYearTwo                    
Long-Term Debt, Excluding Capital Leases, Repayments of Principal in Year Three     5.5cbb_LongTermDebtExcludingCapitalLeasesRepaymentsOfPrincipalInYearThree                    
Long-Term Debt, Excluding Capital Leases, Repayments of Principal in Year Four     305.4cbb_LongTermDebtExcludingCapitalLeasesRepaymentsOfPrincipalInYearFour                    
Long-Term Debt, Excluding Capital Leases, Repayments of Principal in Year Five     5.4cbb_LongTermDebtExcludingCapitalLeasesRepaymentsOfPrincipalInYearFive                    
Long-Term Debt, Excluding Capital Leases, Repayments of Principal After Year Five     1,341.9cbb_LongTermDebtExcludingCapitalLeasesRepaymentsOfPrincipalAfterYearFive                    
Long-Term Debt, Excluding Capital Leases, Gross     1,689.3cbb_LongTermDebtExcludingCapitalLeasesGross                    
Long-Term Debt, Excluding Capital Leases, Net   2,162.7cbb_LongTermDebtExcludingCapitalLeasesNet 1,686.1cbb_LongTermDebtExcludingCapitalLeasesNet 2,162.7cbb_LongTermDebtExcludingCapitalLeasesNet                  
Capital Leases, Future Principal Payments Due, Repayments of Principal in Next Twelve Months     7.2cbb_CapitalLeasesFuturePrincipalPaymentsDueRepaymentsofPrincipalinNextTwelveMonths                    
Capital Leases, Future Principal Payments Due in Two Years     6.8cbb_CapitalLeasesFuturePrincipalPaymentsDueinTwoYears                    
Capital Leases, Future Principal Payments Due in Three Years     4.2cbb_CapitalLeasesFuturePrincipalPaymentsDueinThreeYears                    
Capital Leases, Future Principal Payments Due in Four Years     3.3cbb_CapitalLeasesFuturePrincipalPaymentsDueinFourYears                    
Capital Leases, Future Principal Payments Due in Five Years     3.7cbb_CapitalLeasesFuturePrincipalPaymentsDueinFiveYears                    
Capital Leases, Future Principal Payments Due Thereafter     72.9cbb_CapitalLeasesFuturePrincipalPaymentsDueThereafter                    
Capital Leases, Future Minimum Principal Payments Due     98.1cbb_CapitalLeasesFutureMinimumPrincipalPaymentsDue                    
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months     13.2us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths                    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two     31.9us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo                    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three     9.7us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree                    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four     308.7us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour                    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five     9.1us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive                    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five     1,414.8us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive                    
Long-term Debt, Gross     1,787.4us-gaap_DebtInstrumentCarryingAmount                    
Net unamortized discount   6.3us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet 3.2us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet 6.3us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet                  
Net unamortized discount     0us-gaap_DebtInstrumentUnamortizedDiscount                    
Total debt   2,265.2us-gaap_DebtAndCapitalLeaseObligations 1,784.2us-gaap_DebtAndCapitalLeaseObligations 2,265.2us-gaap_DebtAndCapitalLeaseObligations                  
Capital Leases, Future Minimum Payments Due [Abstract]                          
Capital Leases, Future Minimum Payments Due, Next Twelve Months     14.0us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent                    
Capital Leases, Future Minimum Payments Due in Two Years     13.2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears                    
Capital Leases, Future Minimum Payments Due in Three Years     10.2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears                    
Capital Leases, Future Minimum Payments Due in Four Years     9.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears                    
Capital Leases, Future Minimum Payments Due in Five Years     9.2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears                    
Capital Leases, Future Minimum Payments Due Thereafter     108.2us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter                    
Payments of Debt Issuance Costs     0.9us-gaap_PaymentsOfDebtIssuanceCosts 6.7us-gaap_PaymentsOfDebtIssuanceCosts 20.9us-gaap_PaymentsOfDebtIssuanceCosts                
Amortization of Deferred Charges [Abstract]                          
Amortization of Financing Costs     5.1us-gaap_AmortizationOfFinancingCosts 5.9us-gaap_AmortizationOfFinancingCosts 7.2us-gaap_AmortizationOfFinancingCosts                
Deferred Finance Costs [Abstract]                          
Deferred Finance Costs, Noncurrent, Net   26.1us-gaap_DeferredFinanceCostsNoncurrentNet 18.5us-gaap_DeferredFinanceCostsNoncurrentNet 26.1us-gaap_DeferredFinanceCostsNoncurrentNet                  
Debt Covenants [Abstract]                          
Consolidated total leverage ratio, maximum allowed under Line of Credit Facility     7.00                    
Consolidated senior secured leverage ratio, maximum allowed under Line of Credit Facility     3.50                    
Consolidated interest coverage ratio, minimum allowed under Line of Credit Facility     1.50                    
Line of credit facility, maximum capital expenditures in current year     210cbb_Lineofcreditfacilitymaximumcapitalexpendituresincurrentyear                    
Line of credit facility, maximum aggregate capital expenditures over life of the agreement     937.7cbb_Lineofcreditfacilitymaximumaggregatecapitalexpendituresoverlifeoftheagreement                    
Capital expenditures, excluding CyrusOne     182.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 196.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 367.2us-gaap_PaymentsToAcquirePropertyPlantAndEquipment                
Consolidated Adjusted Senior Debt to EBITDA ratio     4:00                    
Secured Debt, Other     216.8us-gaap_SecuredDebtOther                    
Extinguishment of Debt Disclosures [Abstract]                          
Loss on extinguishment of debt     19.6us-gaap_GainsLossesOnExtinguishmentOfDebt 29.6us-gaap_GainsLossesOnExtinguishmentOfDebt 13.6us-gaap_GainsLossesOnExtinguishmentOfDebt                
Senior Notes due 2015 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Interest Rate, Stated Percentage   7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2015Member		   7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2015Member		                  
Senior Notes due 2017 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Interest Rate, Stated Percentage     8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2017Member		                    
Debt Instrument, Face Amount                       500.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2017Member		  
Senior Subordinated Notes due 2018 [Member]                          
Debt Instrument [Line Items]                          
Proceeds from issuance of long-term debt           625.0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member		              
Customary Events of Default Amount for Existing Debt Instruments     35.0cbb_CustomaryEventsOfDefaultAmountForExistingDebtInstruments
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member		                    
Debt Instrument, Interest Rate, Stated Percentage     8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member		                    
Debt Instrument, Face Amount   625.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member		 300.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member		 625.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member		                  
Senior Notes due 2020 [Member]                          
Debt Instrument [Line Items]                          
Proceeds from issuance of long-term debt           775.0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		              
Customary Events of Default Amount for Existing Debt Instruments     35.0cbb_CustomaryEventsOfDefaultAmountForExistingDebtInstruments
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		                    
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		                    
Incremental Percentage of Face Value     1.00%cbb_IncrementalPercentageofFaceValue
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		                    
Redemption Price, Present Value of Percentage of Face Value     104.188%cbb_RedemptionPricePresentValueofPercentageofFaceValue
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		                    
Debt Instrument, Interest Rate, Stated Percentage     8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		                    
Debt Instrument, Face Amount   683.9us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		 661.2us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		 683.9us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member		                  
Senior Notes due 2022 [Member]                          
Debt Instrument [Line Items]                          
Proceeds from issuance of long-term debt         525.0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2022Member		                
Debt Instrument, Interest Rate, Stated Percentage                         6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2022Member
Debt Instrument, Face Amount                         525.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2022Member
Senior Notes due 2023 [Member]                          
Debt Instrument [Line Items]                          
Proceeds from issuance of long-term debt             50.0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2023Member		            
Customary Events of Default Amount for Existing Debt Instruments     20.0cbb_CustomaryEventsOfDefaultAmountForExistingDebtInstruments
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2023Member		                    
Debt Instrument, Interest Rate, Stated Percentage     7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2023Member		                    
Debt Instrument, Face Amount   40.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2023Member		 40.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2023Member		 40.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2023Member		                  
Various Cincinnati Bell Telephone Notes [Member]                          
Debt Instrument [Line Items]                          
Customary Events of Default Amount for Existing Debt Instruments     20.0cbb_CustomaryEventsOfDefaultAmountForExistingDebtInstruments
/ us-gaap_DebtInstrumentAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		                    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum         7.18%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		                
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum         7.27%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		                
Debt Instrument, Face Amount   134.5us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		 134.5us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		 134.5us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		                  
Cincinnati Bell Telephone Senior Notes due 2028 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Interest Rate, Stated Percentage     6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cbb_CincinnatiBellTelephoneSeniorNotesDue2028Member		                    
Proceeds from Issuance of Unsecured Debt               150.0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= cbb_CincinnatiBellTelephoneSeniorNotesDue2028Member		          
Debt Instrument, Face Amount     134.5us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cbb_CincinnatiBellTelephoneSeniorNotesDue2028Member		                    
Line of Credit [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Maximum Borrowing Capacity     150.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		   200.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		         200.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		      
Standby Letters of Credit [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Maximum Borrowing Capacity     30.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		                    
Bridge Loan [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Maximum Borrowing Capacity     25.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_BridgeLoanMember		                    
Senior Notes due 2015 [Member]                          
Extinguishment of Debt Disclosures [Abstract]                          
Extinguishment of Debt, Amount         247.5us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2015Member		                
Senior Notes due 2017 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage   104.125%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2017Member		                      
Extinguishment of Debt Disclosures [Abstract]                          
Extinguishment of Debt, Amount       500.0us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2017Member		                  
Loss on extinguishment of debt   29.6us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2017Member		                      
Senior Subordinated Notes due 2018 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage                 104.375%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorSubordinatedNotesDue2018Member		        
Extinguishment of Debt Disclosures [Abstract]                          
Extinguishment of Debt, Amount     325.0us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorSubordinatedNotesDue2018Member		                    
Loss on extinguishment of debt     19.4us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorSubordinatedNotesDue2018Member		                    
Senior Notes due 2020 [Member]                          
Extinguishment of Debt Disclosures [Abstract]                          
Extinguishment of Debt, Amount     22.7us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2020Member		   91.1us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2020Member		         91.1us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2020Member		      
Loss on extinguishment of debt     0.2us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_SeniorNotesDue2020Member		                    
Various Cincinnati Bell Telephone Notes [Member]                          
Extinguishment of Debt Disclosures [Abstract]                          
Extinguishment of Debt, Amount         73.0us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ExtinguishmentOfDebtAxis
= cbb_VariousCincinnatiBellTelephoneNotesMember		                
CyrusOne LP [Member] | Line of Credit [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Maximum Borrowing Capacity                         225.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ dei_LegalEntityAxis
= cbb_CyrusoneLpMember
CyrusOne LP [Member] | Standby Letters of Credit [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Maximum Borrowing Capacity                         50.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
/ dei_LegalEntityAxis
= cbb_CyrusoneLpMember
CyrusOne LP [Member] | Bridge Loan [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Maximum Borrowing Capacity                         30.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_BridgeLoanMember
/ dei_LegalEntityAxis
= cbb_CyrusoneLpMember
Debt Instrument, Redemption, Period One [Member] | Senior Subordinated Notes due 2018 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage     102.188%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember		                    
Debt Instrument, Redemption, Period One [Member] | Senior Notes due 2020 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage     104.188%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember		                    
Debt Instrument, Redemption, Period Two [Member] | Senior Subordinated Notes due 2018 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= cbb_SeniorSubordinatedNotesDue2018Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember		                    
Debt Instrument, Redemption, Period Two [Member] | Senior Notes due 2020 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage     102.792%us-gaap_DebtInstrumentRedemptionPricePercentage
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Debt Instrument, Redemption, Period Three [Member] | Senior Notes due 2020 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage     101.396%us-gaap_DebtInstrumentRedemptionPricePercentage
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Debt Instrument, Redemption, Period Four [Member] | Senior Notes due 2020 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
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US Treasury Securities [Member] | Senior Notes due 2020 [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Basis Spread on Variable Rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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= us-gaap_USTreasurySecuritiesMember		                    
Data Center Colocation [Member]                          
Debt Covenants [Abstract]                          
Capital expenditures, excluding CyrusOne     0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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= cbb_DataCenterColocationMember		 7.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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CyrusOne [Member]                          
Deferred Finance Costs [Abstract]                          
Deferred Finance Costs, Noncurrent, Net                         $ 16.9us-gaap_DeferredFinanceCostsNoncurrentNet
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