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Earnings Per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Earnings Per Common Share, Basic and Diluted [Line Items]    
Income (Loss) from Continuing Operations Attributable to Parent $ 0.3us-gaap_IncomeLossFromContinuingOperations $ 5.9us-gaap_IncomeLossFromContinuingOperations
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 48.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 1.1us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Numerator:    
Net income (loss) 49.2us-gaap_NetIncomeLoss 7.0us-gaap_NetIncomeLoss
Preferred stock dividends 2.6us-gaap_PreferredStockDividendsIncomeStatementImpact 2.6us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income (loss) available to common shareowners - basic and diluted 46.6cbb_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted 4.4cbb_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
Denominator:    
Weighted average common shares outstanding - basic 209.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 208.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock-based compensation arrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1.0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding - diluted 209.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 209.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic and diluted earnings (loss) per common share $ 0.22us-gaap_EarningsPerShareBasicAndDiluted $ 0.02us-gaap_EarningsPerShareBasicAndDiluted
Stock Compensation Plan [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3.9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
 
Convertible Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertiblePreferredStockMember
4.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertiblePreferredStockMember
Continuing Operations [Member]    
Schedule of Earnings Per Common Share, Basic and Diluted [Line Items]    
Income (Loss) from Continuing Operations Attributable to Parent 0.3us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
 
Numerator:    
Net income (loss)   5.9us-gaap_NetIncomeLoss
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Preferred stock dividends   2.6us-gaap_PreferredStockDividendsIncomeStatementImpact
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Net income (loss) available to common shareowners - basic and diluted (2.3)cbb_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
3.3cbb_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Denominator:    
Weighted average common shares outstanding - basic 209.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
208.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Stock-based compensation arrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
1.0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Weighted average common shares outstanding - diluted 209.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
209.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Income (Loss) from Continuing Operations, Per Basic and Diluted Share $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 0.02us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Discontinued Operations [Member]    
Schedule of Earnings Per Common Share, Basic and Diluted [Line Items]    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 48.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
 
Numerator:    
Net income (loss) 48.9us-gaap_NetIncomeLoss
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
1.1us-gaap_NetIncomeLoss
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Preferred stock dividends 0us-gaap_PreferredStockDividendsIncomeStatementImpact
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0us-gaap_PreferredStockDividendsIncomeStatementImpact
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Net income (loss) available to common shareowners - basic and diluted $ 48.9cbb_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 1.1cbb_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Denominator:    
Weighted average common shares outstanding - basic 209.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
208.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Stock-based compensation arrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
1.0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Weighted average common shares outstanding - diluted 209.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
209.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share $ 0.23us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember