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Capital Stock (Details)
 3 Months Ended 9 Months Ended
Jan. 07, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
director
classOfCommonShare
Sep. 30, 2021
USD ($)
director
classOfCommonShare
shares
Sep. 30, 2020
USD ($)
shares
May 14, 2021
USD ($)
Feb. 28, 2020
USD ($)
Class of Stock [Line Items]            
Classes of common shares | classOfCommonShare   2 2      
Minimum number of directors up for election to entitle shareholders to vote | director   3 3      
Percentage of directors up for election if more than minimum number   33.33% 33.33%      
Preferred stock dividends   $ 12,000,000 $ 35,067,000      
Losses on stock warrants     99,118,000 $ 0    
ION Media            
Class of Stock [Line Items]            
Exercise right of warrants ( in dollars per share) | $ / shares $ 13          
Berkshire Hathaway            
Class of Stock [Line Items]            
Losses on stock warrants     99,100,000      
Berkshire Hathaway | Fair Value, Inputs, Level 3            
Class of Stock [Line Items]            
Fair value of warrants, with option to settle for cash, for Class A common stock $ 181,000,000       $ 280,000,000  
Preferred Stock | Berkshire Hathaway | ION Media            
Class of Stock [Line Items]            
Financing provided for business acquisition $ 600,000,000          
Preferred shares issued | shares 6,000          
Face value of Preferred shares (in dollars per share) | $ / shares $ 100,000          
Preferred shares redemption price, as a percent 105.00%          
Preferred stock dividend rate 8.00%          
Preferred stock dividend rate if dividends not paid in cash 9.00%          
Preferred stock dividends     $ 33,100,000      
Common stock, Class A            
Class of Stock [Line Items]            
Stock repurchase program, authorized amount (up to)           $ 100,000,000
Shares repurchased | shares     0 0    
Common stock, Class A | Berkshire Hathaway            
Class of Stock [Line Items]            
Number of shares purchasable by warrant (up to) | shares 23,100,000          
Exercise right of warrants ( in dollars per share) | $ / shares $ 13          
Common stock, Class A | Berkshire Hathaway | ION Media            
Class of Stock [Line Items]            
Number of shares purchasable by warrant (up to) | shares 23,100,000