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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Years
Dec. 31, 2013
Dec. 31, 2012
Operating lease expense $ 14.0us-gaap_LeaseAndRentalExpense $ 13.4us-gaap_LeaseAndRentalExpense $ 19.3us-gaap_LeaseAndRentalExpense
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 10.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 6.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 5.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 3.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 3.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 21.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 50.4us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Asset Retirement Obligation [Abstract]      
Balance, beginning of period 8.5us-gaap_AssetRetirementObligation 7.1us-gaap_AssetRetirementObligation  
Liabilities settled (0.2)us-gaap_AssetRetirementObligationLiabilitiesSettled (0.1)us-gaap_AssetRetirementObligationLiabilitiesSettled  
Liabilities incurred 0us-gaap_AssetRetirementObligationLiabilitiesIncurred 0.1us-gaap_AssetRetirementObligationLiabilitiesIncurred  
Revisions to estimated cash flow 0.3us-gaap_AssetRetirementObligationRevisionOfEstimate 1.1us-gaap_AssetRetirementObligationRevisionOfEstimate  
Accretion expense 0.5us-gaap_AssetRetirementObligationAccretionExpense 0.5us-gaap_AssetRetirementObligationAccretionExpense  
Deconsolidation of CyrusOne 0cbb_DeconsolidationofAssetRetirementObligation (0.2)cbb_DeconsolidationofAssetRetirementObligation  
Balance, end of period 9.1us-gaap_AssetRetirementObligation 8.5us-gaap_AssetRetirementObligation 7.1us-gaap_AssetRetirementObligation
Letters of Credit Outstanding, Amount 6.9us-gaap_LettersOfCreditOutstandingAmount    
Long-term Purchase Commitments, Range of Years, Minimum 1cbb_LongTermPurchaseCommitmentsRangeOfYearsMinimum    
Long-Term Purchase Commitments, Range of Years, Maximum 3cbb_LongTermPurchaseCommitmentsRangeOfYearsMaximum    
Long-term Purchase Commitment, Amount 178us-gaap_LongTermPurchaseCommitmentAmount 117us-gaap_LongTermPurchaseCommitmentAmount  
Transaction-related compensation 0cbb_TransactionRelatedCompensation 42.6cbb_TransactionRelatedCompensation 0cbb_TransactionRelatedCompensation
Transaction-related compensation to CyrusOne employees   20.0cbb_TransactionrelatedcompensationtoemployeesofEquityMethodInvestee  
Data Center Colocation [Member]      
Operating lease expense   $ 0.3us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cbb_DataCenterColocationMember
$ 5.9us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cbb_DataCenterColocationMember