Investments - Schedule of Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Investments [Abstract] | ||
| Net realized gains (losses) | $ 0.4 | $ (0.4) |
| Net change in unrealized gains (losses) | (249.0) | 7.4 |
| Total | $ (248.6) | $ 7.0 |