Long-Term Debt and Capital Leases - Debt Agreements (Details) - USD ($) $ in Millions							3 Months Ended	9 Months Ended
	Sep. 15, 2016	Aug. 19, 2016	Jul. 15, 2016	May 11, 2016	May 21, 2015	Nov. 27, 2013	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Jul. 01, 2015	Jul. 17, 2012
Long-Term Debt and Capital Lease Obligations
Loss on early extinguishment of debt							$ 28.1	$ 30.6	$ 22.9
Outstanding balance							2,973.0	2,973.0		$ 2,910.2
Term B and Term B-1 Loans
Long-Term Debt and Capital Lease Obligations
Loss on early extinguishment of debt					$ 22.9
Repayment of debt					150.0
Term B Loans
Long-Term Debt and Capital Lease Obligations
Repayments of long-term debt		$ 1,825.0
Loss on early extinguishment of debt		10.5
Outstanding balance							$ 2,053.1	$ 2,053.1		1,400.8
Term B Loans \| Sixth Amendment to Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Face amount		$ 2,065.0
Term of debt instrument		7 years
Period of time after debt instrument term for which a conditional maturity clause becomes effective related to refinancing existing debt		91 days
Funding acquisition and repayment of long-term debt		$ 240.0
Term B Loans \| Sixth Amendment to Senior Secured Credit Facilities \| Adjusted LIBOR rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)		3.50%
Variable interest rate floor (as a percent)		1.00%
Term B Loans \| Sixth Amendment to Senior Secured Credit Facilities \| Alternate base rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)		2.50%
Term B Loans \| Fifth Amendment to Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Face amount				$ 432.5
Term B Loans \| Fifth Amendment to Senior Secured Credit Facilities \| Adjusted LIBOR rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)				3.50%
Variable interest rate floor (as a percent)				1.00%
Term B Loans \| Fifth Amendment to Senior Secured Credit Facilities \| Alternate base rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)				2.50%
Term B Loans \| Third Amendment To Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Face amount					$ 1,411.4
Term B Loans \| Third Amendment To Senior Secured Credit Facilities \| Adjusted LIBOR rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)					3.50%
Variable interest rate floor (as a percent)					1.00%
Term B Loans \| Third Amendment To Senior Secured Credit Facilities \| Alternate base rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)					2.50%
Term B Loans \| Second Amendment to Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Outstanding balance					$ 1,560.4
Term B Loans \| Second Amendment to Senior Secured Credit Facilities \| Adjusted LIBOR rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)						3.75%
Term B Loans \| Second Amendment to Senior Secured Credit Facilities \| Alternate base rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)						2.75%
Term B-1 Loans
Long-Term Debt and Capital Lease Obligations
Repayments of long-term debt				$ 382.5
Loss on early extinguishment of debt				$ 2.5
Outstanding balance										383.4
Term B-1 Loans \| Fourth Amendment to Senior Secured Credit Facilities \| Adjusted LIBOR rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)				3.00%
Variable interest rate floor (as a percent)				0.75%
Term B-1 Loans \| Fourth Amendment to Senior Secured Credit Facilities \| Alternate base rate
Long-Term Debt and Capital Lease Obligations
Basis spread on variable rate (as a percent)				2.00%
Revolving Credit Facility \| Fourth Amendment to Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Face amount											$ 200.0
Amount of available borrowings for which the maturity date is extended if certain conditions in agreement are met											180.0
Minimum amount of outstanding borrowings that requires excess borrowings to be repaid											$ 180.0
Revolving Credit Facility \| Original Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Face amount												$ 200.0
Senior Subordinated Notes
Long-Term Debt and Capital Lease Obligations
Repayments of long-term debt			$ 69.7
Interest rate (as a percent)							13.38%	13.38%
Repayments of long term debt principal portion	$ 159.1		46.9
Payment of call premium	10.7		3.1
Interest Paid	3.5		19.7
Unamortized debt issuance costs	29.0		$ 0.9
Outstanding balance	$ 89.0						$ 88.4	$ 88.4		$ 292.5
Senior Subordinated Notes \| Sixth Amendment to Senior Secured Credit Facilities
Long-Term Debt and Capital Lease Obligations
Interest rate (as a percent)							13.38%	13.38%

WideOpenWest Finance, LLC 10-Q