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Asset Sales (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 01, 2021
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of Ohio markets, net         $ 1,112.5
Gain on sale of Ohio markets         $ (689.6)
Transition Services Agreement          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Agreement term   12 months      
Astound broadband markets | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration   $ 661.0      
Atlantic broadband markets          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Lease buyout     $ 9.3    
Atlantic broadband markets | Term B Loans          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Repayment of debt       $ 1,087.0  
Atlantic broadband markets | Discontinued Operations, Disposed of by sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration $ 1,125.0        
Proceeds from sale of Ohio markets, net 1,100.0        
Gain on sale of Ohio markets $ 689.6        
Atlantic | Transition Services Agreement          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Agreement term   1 year