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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