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Acquisitions (Narrative) (Details)
SFr / shares in Units, $ / shares in Units, $ in Millions, SFr in Billions
1 Months Ended 12 Months Ended
Nov. 11, 2020
CHF (SFr)
SFr / shares
Nov. 11, 2020
USD ($)
Apr. 30, 2021
Dec. 31, 2020
USD ($)
Jul. 19, 2022
Nov. 11, 2020
$ / shares
Sunrise Acquisition            
Business Acquisition [Line Items]            
Share price (in dollars per share) | (per share) SFr 110         $ 120
Consideration transferred SFr 5.0 $ 5,400.0        
Percentage of shares tendered     100.00%      
Revenue       $ 314.0    
Net earnings       $ 15.4    
NetCo | Telenet            
Business Acquisition [Line Items]            
Percentage of ownership interest         66.80%  
NetCo | Fluvius            
Business Acquisition [Line Items]            
Percentage of ownership interest         33.20%