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Equity Securities - (Summary of Cumulative Gross Unrealized Gains and Cumulative Gross Unrealized Losses and Impairments) (Details) - Non Marketable Equity Securities - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cumulative gross unrealized gains | $ 243.5 | $ 243.3
Cumulative gross unrealized losses and impairments | $ 322.4 | $ 322.4

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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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