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Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Revenue	$ 308.3us-gaap_SalesRevenueNet	$ 327.5us-gaap_SalesRevenueNet	$ 319.9us-gaap_SalesRevenueNet	$ 322.5us-gaap_SalesRevenueNet	$ 308.4us-gaap_SalesRevenueNet	$ 310.8us-gaap_SalesRevenueNet	$ 312.0us-gaap_SalesRevenueNet	$ 325.7us-gaap_SalesRevenueNet	$ 1,278.2us-gaap_SalesRevenueNet	$ 1,256.9us-gaap_SalesRevenueNet	$ 1,473.9us-gaap_SalesRevenueNet
Operating income (loss)	7.3us-gaap_OperatingIncomeLoss	16.0us-gaap_OperatingIncomeLoss	35.6us-gaap_OperatingIncomeLoss	56.9us-gaap_OperatingIncomeLoss	40.1us-gaap_OperatingIncomeLoss	57.7us-gaap_OperatingIncomeLoss	46.8us-gaap_OperatingIncomeLoss	19.2us-gaap_OperatingIncomeLoss	115.8us-gaap_OperatingIncomeLoss	163.8us-gaap_OperatingIncomeLoss	270.1us-gaap_OperatingIncomeLoss
Expenditures for long-lived assets									(182.3)	(196.9)	(367.2)
Depreciation and amortization									231.0	169.6	217.4
Assets	1,819.7us-gaap_Assets				2,107.3us-gaap_Assets				1,819.7us-gaap_Assets	2,107.3us-gaap_Assets
Service revenue									999.6us-gaap_SalesRevenueServicesNet	1,039.3us-gaap_SalesRevenueServicesNet	1,272.8us-gaap_SalesRevenueServicesNet
Product revenue									278.6us-gaap_SalesRevenueGoodsNet	217.6us-gaap_SalesRevenueGoodsNet	201.1us-gaap_SalesRevenueGoodsNet
Segment Reporting Information, Additional Information [Abstract]
Number of Operating Segments								4us-gaap_NumberOfOperatingSegments	3us-gaap_NumberOfOperatingSegments
Restructuring charges		9.0us-gaap_RestructuringCharges							15.9us-gaap_RestructuringCharges	13.7us-gaap_RestructuringCharges	3.4us-gaap_RestructuringCharges
Impairment of assets, excluding goodwill									(12.1)us-gaap_OtherAssetImpairmentCharges	0us-gaap_OtherAssetImpairmentCharges	(14.2)us-gaap_OtherAssetImpairmentCharges
Transaction costs		3.0cbb_Transactioncosts							4.4cbb_Transactioncosts	1.6cbb_Transactioncosts	6.3cbb_Transactioncosts
Change in Accounting Estimate, Effect of Change on Operating Results, Increase in Depreciation Expense					3.0			8.5	62.2
Loss from CyrusOne equity method investment									(7.0)	(10.7)	0
Investment in CyrusOne	273.6us-gaap_EquityMethodInvestments				471.0us-gaap_EquityMethodInvestments				273.6us-gaap_EquityMethodInvestments	471.0us-gaap_EquityMethodInvestments
Impairment of assets, excluding goodwill									12.1us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	14.2us-gaap_AssetImpairmentCharges
Transaction-related compensation									0cbb_TransactionRelatedCompensation	42.6cbb_TransactionRelatedCompensation	0cbb_TransactionRelatedCompensation
Handsets and accessories [Member]
Segment Reporting [Abstract]
Product revenue									18.0	21.8	23.2
IT, telephony and other equipment [Member]
Segment Reporting [Abstract]
Product revenue									260.6	195.8	177.9
Wireline [Member]
Segment Reporting [Abstract]
Revenue									740.7	724.8	730.5
Operating income (loss)									182.5	190.2	212.9
Expenditures for long-lived assets									(163.7)	(162.6)	(114.2)
Depreciation and amortization									115.7	112.2	106.0
Assets	832.2				780.8				832.2	780.8
Service revenue									714.5	702.3	705.0
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									(0.5)	9.1	3.5
Impairment of assets, excluding goodwill									4.6	0	0.5
IT Services and Hardware [Member]
Segment Reporting [Abstract]
Revenue									433.0	344.1	315.7
Operating income (loss)									19.8	8.5	10.3
Expenditures for long-lived assets									(11.9)	(10.6)	(9.0)
Depreciation and amortization									11.7	10.5	8.6
Assets	61.4				48.9				61.4	48.9
Service revenue									161.4	138.7	130.2
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									0	0.7	(1.2)
Increase (decrease) in Revenue									88.9
Wireless [Member]
Segment Reporting [Abstract]
Revenue									132.8	201.5	241.8
Operating income (loss)									(66.3)	18.2	51.2
Expenditures for long-lived assets									(6.5)	(16.0)	(15.8)
Depreciation and amortization									103.4	41.2	31.9
Assets	122.7				247.5				122.7	247.5
Service revenue									123.7	183.1	222.7
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges			6.4						16.3	0.2	1.6
Impairment of assets, excluding goodwill									7.5		0.4
Transaction costs									3.2
Change in Accounting Estimate, Effect of Change on Operating Results, Increase in Depreciation Expense									62.2
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results									(19.6)
Gain (Loss) on Disposition of Assets										3.5
Data Center Colocation [Member]
Segment Reporting [Abstract]
Revenue									0	15.6	221.3
Operating income (loss)									0	3.2	30.4
Expenditures for long-lived assets									0	(7.7)	(228.2)
Depreciation and amortization									0	5.2	70.6
Service revenue									0	15.2	214.9
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									0	0	0.5
Impairment of assets, excluding goodwill											11.8
Impairment of assets, excluding goodwill											13.3
Corporate Segment [Member]
Segment Reporting [Abstract]
Operating income (loss)									(20.2)	(56.3)	(34.7)
Expenditures for long-lived assets									(0.2)	0	0
Depreciation and amortization									0.2	0.5	0.3
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									0.1	3.7	(1.0)
Transaction costs									1.2
Intersegment Eliminations [Member]
Segment Reporting [Abstract]
Revenue									(28.3)	(29.1)	(35.4)
Intersegment Eliminations [Member] \| Wireline [Member]
Segment Reporting [Abstract]
Revenue									15.6	16.8	19.1
Intersegment Eliminations [Member] \| IT Services and Hardware [Member]
Segment Reporting [Abstract]
Revenue									11.0	9.6	7.6
Intersegment Eliminations [Member] \| Wireless [Member]
Segment Reporting [Abstract]
Revenue									1.7	2.3	2.3
Intersegment Eliminations [Member] \| Data Center Colocation [Member]
Segment Reporting [Abstract]
Revenue									0	0.4	6.4
Intersegment Eliminations [Member] \| Corporate Segment [Member]
Segment Reporting [Abstract]
Assets	803.4				1,030.1				803.4	1,030.1
Sales [Member] \| Intersegment Eliminations [Member]
Segment Reporting [Abstract]
Revenue									28.3	29.1	35.4
Facility Closing [Member] \| Wireline [Member]
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									(1.4)
Employee Severance [Member]
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									4.2	9.0	2.5
Employee Severance [Member] \| Wireline [Member]
Segment Reporting Information, Additional Information [Abstract]
Restructuring charges									0.9
Telecom and IT equipment [Member] \| IT Services and Hardware [Member]
Segment Reporting Information, Additional Information [Abstract]
Increase (decrease) in Revenue									65.1
Managed and Professional Services [Member] \| IT Services and Hardware [Member]
Segment Reporting Information, Additional Information [Abstract]
Increase (decrease) in Revenue									$ 23.8
Property, Plant and Equipment [Member] \| Wireless [Member]
Segment Reporting Information, Additional Information [Abstract]
Property, Plant and Equipment, Useful Life										30 months