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Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
Jan. 22, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Subsequent Event [Line Items]        
Decommissioning Liability, Noncurrent Estimate $ 10cbb_DecommissioningLiabilityNoncurrentEstimate      
Asset Retirement Obligation   9.1us-gaap_AssetRetirementObligation 8.5us-gaap_AssetRetirementObligation 7.1us-gaap_AssetRetirementObligation
Capital Lease Obligations [Member]        
Subsequent Event [Line Items]        
Asset Retirement Obligation   3.3us-gaap_AssetRetirementObligation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_CapitalLeaseObligationsMember		    
Other Noncurrent Liabilities [Member]        
Subsequent Event [Line Items]        
Asset Retirement Obligation   $ 7.5us-gaap_AssetRetirementObligation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember