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Investments (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2022
Jun. 30, 2021
Jan. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Feb. 28, 2021
Schedule of Equity Method Investments [Line Items]                    
Equity method investments           $ 79,600,000 $ 93,700,000     $ 27,400,000
Payments to acquire equity method investments   $ 23,800,000                
Equity method investment gain loss related to step up fair value   $ 12,300,000                
Investments in marketable equity securities           0 5,800,000      
Proceeds from sale and maturity of marketable securities $ 9,900,000   $ 51,000,000              
Equity securities, FV-NI, gain (loss) $ 4,100,000         4,100,000 (11,100,000) $ 82,800,000    
Equity securities, FV-NI, realized gain (loss)     $ (5,400,000) $ 37,400,000            
Investments in non-marketable equity securities           $ 42,700,000 $ 37,700,000      
Impairment related to partial write-down of equity method investment               $ 20,000,000    
Unrealized gain         $ 14,900,000          
Targeted Streaming Service                    
Schedule of Equity Method Investments [Line Items]                    
Investments in non-marketable equity securities                 $ 5,000,000  
Equity Method Investment                    
Schedule of Equity Method Investments [Line Items]                    
Equity method investment, ownership percentage   50.00%   50.00%     50.00% 50.00%