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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities owned not readily marketable | $ 316.8 |  | $ 159.8
Net unrealized gains (losses) | 139.7 | $ (196.2) |
Level 2 | Measured on a recurring basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-term debt, fair value | 1,511.0 |  | 1,484.0
Level 3 | Measured on a recurring basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investments | $ 72.3 |  | $ 52.0

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