Investments - Schedule of Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Investments [Abstract] | ||||
| Net realized gains | $ 52.3 | $ 58.5 | $ 10.7 | $ 33.6 |
| Net change in unrealized gains (losses) | (106.6) | 30.0 | (167.0) | 66.5 |
| Total | $ (54.3) | $ 88.5 | $ (156.3) | $ 100.1 |