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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.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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