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2. Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Equity Securities, FV-NI, Unrealized Loss $ (20.1)  
Fair value of Appreciation rights    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Investment Owned, Unrecognized Unrealized Appreciation [1] 10.2  
Short-term Investments [Member] | Fair Value, Recurring [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax [2] 0.9 $ 0.3
Short-term Investments [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax [2] $ 0.4 $ 0.2
[1] The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets.
[2] Available-for-sale investments are included in Short-term investments in the condensed consolidatedbalance sheets.