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Financial Instruments (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 29, 2020
Jul. 31, 2015
USD ($)
shares
Dec. 31, 2020
MXN ($)
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Dec. 31, 2010
USD ($)
Financial Instruments            
Principal amount     $ 123,877,278,000      
UHI            
Financial Instruments            
Principal amount           $ 1,063.1
UHI | Warrants issued by UHI            
Financial Instruments            
Principal amount   $ 1,125.0        
Warrants exercisable for UHI's common stock | shares   4,858,485        
Warrants exercised | shares   267,532        
Stock spot price | $ / shares     $ 190 $ 390 $ 387  
Expected volatility rate     64.00% 40.00% 36.00%  
Minimum | UHI | Warrants issued by UHI            
Financial Instruments            
Equity stake 10.00% 7.80%        
Minimum | UHI | Warrants issued by UHI | Weighted average cost of capital            
Financial Instruments            
Weighted average cost of capital     8      
Exit multiple     8      
Maximum | UHI | Warrants issued by UHI            
Financial Instruments            
Equity stake 35.90% 10.00%        
Maximum | UHI | Warrants issued by UHI | Weighted average cost of capital            
Financial Instruments            
Weighted average cost of capital     9      
Exit multiple     9