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Acquisitions (Schedules) (Details) - USD ($)
$ in Millions
May 16, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 11, 2016
Business Acquisition [Line Items]          
Goodwill   $ 13,715.8 $ 14,354.1 $ 12,758.5  
BASE          
Business Acquisition [Line Items]          
Cash and cash equivalents         $ 160.1
Other current assets         148.3
Property and equipment, net         811.4
Goodwill         330.7
Other assets, net         10.5
Other accrued and current liabilities         (290.0)
Other long-term liabilities         (93.4)
Total purchase price         1,494.3
CWC          
Business Acquisition [Line Items]          
Special Dividend $ 193.8        
Cost of acquired entity 4,683.9        
Mobile Spectrum | BASE          
Business Acquisition [Line Items]          
Intangible assets subject to amortization         261.0
Customer relationships | BASE          
Business Acquisition [Line Items]          
Intangible assets subject to amortization         115.0
Trademarks | BASE          
Business Acquisition [Line Items]          
Intangible assets subject to amortization         $ 40.7
Liberty Global Shares | CWC | Class A          
Business Acquisition [Line Items]          
Liberty Global Class A & C ordinary shares 1,167.2        
Liberty Global Shares | CWC | Class C          
Business Acquisition [Line Items]          
Liberty Global Class A & C ordinary shares 2,803.5        
LiLAC Shares | CWC | Class A          
Business Acquisition [Line Items]          
Liberty Global Class A & C ordinary shares 144.1        
LiLAC Shares | CWC | Class C          
Business Acquisition [Line Items]          
Liberty Global Class A & C ordinary shares $ 375.3