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Acquisitions and Dispositions (Narrative) (Details)
€ in Millions, $ in Millions, SFr in Billions
3 Months Ended
May 02, 2019
EUR (€)
May 02, 2019
USD ($)
Jul. 31, 2018
Dec. 31, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
CHF (SFr)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Carrying value             $ 29,408.2     $ 29,183.9
UPC Switzerland                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Carrying value             1,645.0      
UPC Austria | Discontinued Operations, Disposed of by Sale                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Term of transitional services     4 years              
Revenue from transitional services             $ 11.2      
Subsequent Event | UPC DTH | Discontinued Operations, Disposed of by Sale                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Term of transitional services 2 years 2 years                
Proceeds from divestiture € 134.2 $ 149.9                
Forecast | Vodafone Disposal Group | Discontinued Operations, Disposed of by Sale                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Compensatory payment         € 250.0       $ 280.5  
Term of transitional services         4 years 4 years        
Proceeds from divestiture         € 10,600.0 $ 11,900.0        
Forecast | UPC Switzerland                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Consideration for disposal | SFr               SFr 6.3    
Term of transitional services       5 years            
Proceeds from divestiture of business       $ 2,600.0            
Forecast | Sunrise Communications Group AG                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Liabilities assumed       $ 3,700.0