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Investments - Equity Investments without Readily Determinable Fair Values (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Other Investments |  |  |  |
Cumulative upward adjustments | $ 72.0 |  | $ 72.0 |
Investment in equity security | 0.2 | $ 10.3 | 0.2 | $ 15.3
Upward adjustments | $ 0.0 | $ 2.3 | $ 0.0 | $ 20.0

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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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