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Fair Values (Details Textual) - Fair Value, Nonrecurring - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying value of equity securities without readily determinable fair values | $ 900.0 |  | $ 900.0 |  | $ 900.0
Net upward adjustments of equity securities without readily determinable fair values | 1.0 | $ 0.0 | 68.0 | $ 0.0 |
Net downward adjustments of equity securities without readily determinable fair values | 20.0 | $ 17.0 | 31.0 | $ 122.0 |
Cumulative net unrealized gains for equity investments without readily determinable fair values | 1,100.0 |  | 1,100.0 |  | 1,100.0
Cumulative net unrealized losses for equity investments without readily determinable fair values | 456.0 |  | 456.0 |  | 431.0
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying value of equity securities without readily determinable fair values | $ 13.0 |  | $ 13.0 |  | $ 0.0

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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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