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Acquisitions and Dispositions (Narrative) (Details)
SFr / shares in Units, $ / shares in Units, $ in Millions, SFr in Billions
3 Months Ended
Nov. 11, 2020
CHF (SFr)
SFr / shares
Nov. 11, 2020
USD ($)
May 07, 2020
Mar. 31, 2021
USD ($)
Apr. 30, 2021
Feb. 28, 2021
Nov. 11, 2020
$ / shares
U.K. J.V.              
Business Acquisition [Line Items]              
Termination rights period     24 months        
Extended period     6 months        
Ownership percentage     50.00%        
Telefonica              
Business Acquisition [Line Items]              
Co-venturer ownership percentage     50.00%     50.00%  
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       99.20%      
Recorded liability       $ 41.2      
Sunrise Acquisition | Subsequent Event              
Business Acquisition [Line Items]              
Interest acquired         0.80%