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Condensed Consolidated Balance Sheets Parenthetical (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Allowance for receivables $ 11,600,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12,400,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred Stock, Shares Authorized 2,357,299us-gaap_PreferredStockSharesAuthorized 2,357,299us-gaap_PreferredStockSharesAuthorized
Preferred Stock, 6 3/4% Cumulative Convertible, Shares Issued 155,250us-gaap_PreferredStockSharesIssued 155,250us-gaap_PreferredStockSharesIssued
Preferred Stock, 6 3/4% Cumulative Convertible, Shares Outstanding 155,250us-gaap_PreferredStockSharesOutstanding 155,250us-gaap_PreferredStockSharesOutstanding
Preferred Stock, Depositary Shares 3,105,000cbb_PreferredStockDepositaryShares 3,105,000cbb_PreferredStockDepositaryShares
Preferred Stock, Dividend Rate, Percentage 6.75%us-gaap_PreferredStockDividendRatePercentage 6.75%us-gaap_PreferredStockDividendRatePercentage
Preferred Stock, Liquidation Preference Per Share $ 1,000us-gaap_PreferredStockLiquidationPreferenceValue $ 1,000us-gaap_PreferredStockLiquidationPreferenceValue
Preferred Stock Liquidation Depositary Per Share $ 50cbb_PreferredStockLiquidationPreferencePerDepositaryShare $ 50cbb_PreferredStockLiquidationPreferencePerDepositaryShare
Common Stock, Par or Stated Value Per Share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 480,000,000us-gaap_CommonStockSharesAuthorized 480,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 209,840,204us-gaap_CommonStockSharesIssued 209,571,138us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 209,296,068us-gaap_CommonStockSharesOutstanding 209,296,068us-gaap_CommonStockSharesOutstanding