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The Millicom Group - A.2. Joint Ventures (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 13, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Disclosure of joint ventures [line items]          
Statutory reserves unavailable for distribution   $ 472.0 $ 486.0 $ 310.0  
Profit (loss) from other joint ventures and associates, net   0.0 [1] (40.0) [2] (1.0) [2]  
Increase (Decrease) Joint Ventures [Roll Forward]          
Investments in joint ventures   596.0      
Investments in joint ventures   590.0 596.0    
Honduras joint ventures          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture         50.00%
Joint ventures          
Disclosure of joint ventures [line items]          
Total net assets   401.0 406.0    
Statutory reserves unavailable for distribution   3.0 3.0    
Guatemala and Honduras Joint Ventures          
Disclosure of joint ventures [line items]          
Cash repatriated from joint venture     62.0    
Guatemala and Honduras Joint Ventures | Trade receivables, net          
Disclosure of joint ventures [line items]          
Cash repatriated from joint venture     13.0    
Honduras joint ventures          
Disclosure of joint ventures [line items]          
Total net assets   (17.0) (18.0) (8.0)  
Cash repatriated from joint venture   85.0      
Dividends and advances paid to Millicom   $ 9.0 $ 0.0 $ 24.0  
Proportion of ownership interest in joint venture   66.70% 66.70% 66.70%  
Increase (Decrease) Joint Ventures [Roll Forward]          
Investments in joint ventures   $ 596.0 $ 610.0    
Results for the year   32.0 27.0 $ 27.0  
Dividends declared during the year   (35.0) (34.0)    
Currency exchange differences   (7.0) (7.0)    
Capital increase   3.0      
Investments in joint ventures   $ 590.0 $ 596.0 610.0  
Telefonica Celular S.A          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture   66.70% 66.70%    
Navega S.A. de CV          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture   66.70% 66.70%    
Guatemala joint ventures          
Disclosure of joint ventures [line items]          
Dividends and advances paid to Millicom     $ 13.0 47.0  
Increase (Decrease) Joint Ventures [Roll Forward]          
Results for the year     $ 183.0 144.0  
Ghana          
Increase (Decrease) Joint Ventures [Roll Forward]          
Results for the year       $ 0.0  
Bharti Airtel Ghana Holdings B.V.          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture   50.00% 50.00%    
Increase (Decrease) Joint Ventures [Roll Forward]          
Payments for reimbursements of certain bank facilities $ 37.5        
[1] Tigo Guatemala is fully consolidated since the acquisition of the remaining 45% shareholding on November 12, 2021. See note A.1.2. for further details. As a result, numbers might not be directly comparable with previous years' figures.
[2] Re-presented for discontinued operations (see note A.4.)