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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