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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

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Interest expense, offshore bridge loans from banks.

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- Definition

The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash inflow from bank borrowing during the year.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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