Investments - Components of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Total investments per Consolidated Balance Sheets	$ 221.9	$ 98.6
Consolidated Funds
Summary of Investment Holdings [Line Items]
Investments	154.0	33.9
Total investments per Consolidated Balance Sheets	154.0	33.9
Consolidated Entity Excluding Consolidated Funds
Summary of Investment Holdings [Line Items]
Total investments per Consolidated Balance Sheets	67.9	64.7
Consolidated Entity Excluding Consolidated Funds | Other investments
Summary of Investment Holdings [Line Items]
Investments	19.4	20.0
Consolidated Entity Excluding Consolidated Funds | Investments related to long-term incentive compensation plans
Summary of Investment Holdings [Line Items]
Investments	$ 48.5	$ 44.7