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2. Fair Value Measurements (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2022

Sep. 30, 2022

Dec. 31, 2021

Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]

Equity Securities, FV-NI, Unrealized Loss

$ (270.0)

$ (6,000.0)

Fair value of Appreciation rights

Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]

Investment Owned, Unrecognized Unrealized Depreciation

^[1]

85.2

85.2

Investment Owned, Unrecognized Unrealized Appreciation

^[1]

0.6

0.6

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]

0.1

0.1

$ 0.6

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]

$ 0.0

$ 0.0

$ 0.5

[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.

X

- 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

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
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+ References

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