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Other Liabilities - Narrative (Details) - ION Media - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
Mar. 31, 2021
Jan. 07, 2021
Business Acquisition [Line Items]    
Exercise right of warrants ( in dollars per share)   $ 13
Uncertain tax position liabilities assumed in acquisition   $ 19.3
Uncertain tax liabilities assumed in acquisition related to DPAD   $ 15.1
Berkshire Hathaway | Preferred Stock    
Business Acquisition [Line Items]    
Number of shares purchasable by warrant   23.1
Exercise right of warrants ( in dollars per share)   $ 13
Fair value of warrants, with option to settle for cash, for Class A common stock $ 248.0 $ 181.0