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Investments in Unconsolidated Affiliates - Summary of Investments in Unconsolidated Affiliates Not Accounted for Under Equity Method Without a Readily Determinable Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Equity Investments With Readily Determinable Fair Value |  |
Schedule Of Equity Method Investments [Line Items] |  |
Cost Basis | $ 25.0 | $ 25.0
Unrealized Gain (Loss) | (21.5) | (21.2)
Fair Value | 3.5 | 3.8
Equity Investments Without Readily Determinable Fair Value |  |
Schedule Of Equity Method Investments [Line Items] |  |
Cost Basis | 5.5 | 4.2
Accumulated Impairment and Adjustments | (0.2) | (0.2)
Carrying Value | $ 5.3 | $ 4.0

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