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Fair Value Measurements (Restricted cash and Restricted Time Deposits, Narrative) (Details) - Fair Value, Measurements, Recurring [Member] - Changyou [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan received from bank $ 153.0 $ 215.6    
Interest income from restricted time deposits     $ 5.0 $ 0.1
Interest expense on bank loans     $ 5.3 0.1
Deposit certificates pledged   212.0   212.0
Restricted Cash [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposit certificates pledged   110.0   110.0
Restricted Time Deposit [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposit certificates pledged   $ 102.0   $ 102.0