Debt Debt - Schedule of Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Corporate Credit Agreement - Tranche B Term Loan	Sep. 30, 2013 Capital lease obligations and other debt [Member]	Dec. 31, 2012 Capital lease obligations and other debt [Member]	Oct. 15, 2013 8 1/4% Senior Notes due 2017 [Member]	Sep. 30, 2013 8 1/4% Senior Notes due 2017 [Member]	Dec. 31, 2012 8 1/4% Senior Notes due 2017 [Member]	Sep. 30, 2013 8 3/4% Senior Subordinated Notes due 2018 [Member]	Dec. 31, 2012 8 3/4% Senior Subordinated Notes due 2018 [Member]	Sep. 30, 2013 8 3/8% Senior Notes due 2020 [Member]	Dec. 31, 2012 8 3/8% Senior Notes due 2020 [Member]	Sep. 30, 2013 CyrusOne 6 3/8% Senior Notes due 2022 [Member]	Jan. 24, 2013 CyrusOne 6 3/8% Senior Notes due 2022 [Member]	Dec. 31, 2012 CyrusOne 6 3/8% Senior Notes due 2022 [Member]	Sep. 30, 2013 7 1/4% Senior Notes due 2023 [Member]	Dec. 31, 2012 7 1/4% Senior Notes due 2023 [Member]	Sep. 30, 2013 Various Cincinnati Bell Telephone notes [Member]	Dec. 31, 2012 Various Cincinnati Bell Telephone notes [Member]	Sep. 30, 2013 Long-term debt, less current portion, before deducting unamortized discount or premium [Member]	Dec. 31, 2012 Long-term debt, less current portion, before deducting unamortized discount or premium [Member]	Sep. 30, 2013 Current Portion of Long-Term Debt [Member] Corporate Credit Agreement - Tranche B Term Loan	Dec. 31, 2012 Current Portion of Long-Term Debt [Member] Corporate Credit Agreement - Tranche B Term Loan	Sep. 30, 2013 Current Portion of Long-Term Debt [Member] 8 1/4% Senior Notes due 2017 [Member]	Dec. 31, 2012 Current Portion of Long-Term Debt [Member] 8 1/4% Senior Notes due 2017 [Member]	Sep. 30, 2013 Long-Term Debt, Less Current Portion [Member] Corporate Credit Agreement - Tranche B Term Loan	Dec. 31, 2012 Long-Term Debt, Less Current Portion [Member] Corporate Credit Agreement - Tranche B Term Loan	Sep. 30, 2013 Long-Term Debt, Less Current Portion [Member] 8 1/4% Senior Notes due 2017 [Member]	Dec. 31, 2012 Long-Term Debt, Less Current Portion [Member] 8 1/4% Senior Notes due 2017 [Member]
Debt Instrument [Line Items]
Net unamortized discount on 8 1/4% Senior Notes due 2017						$ 3.7	$ (3.7)	$ 0
Receivables facility amount outstanding	0	52.0
Debt Instrument, Face Amount			540.0			500.0			625.0	625.0	683.9	683.9	0	525.0	525.0	40.0	40.0	134.5	134.5			5.4	0	500.0	0	534.6	0	0	500.0
Long-term debt, less current portion	2,108.2	2,676.0		96.9	123.1															2,114.9	2,683.5
Net unamortized discount	(6.7)	(7.5)
Total debt	2,617.1	2,689.4
Debt Instrument, Interest Rate, Stated Percentage							8.25%		8.75%		8.375%			6.375%		7.25%
Current portion of long-term debt	$ 508.9	$ 13.4		$ 7.2	$ 13.4