Investments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Investment Holdings [Line Items]
Total investments per Condensed Consolidated Balance Sheets	$ 208.7	$ 221.9
Consolidated Funds
Investment Holdings [Line Items]
Investments	155.8	154.0
Total investments per Condensed Consolidated Balance Sheets	155.8	154.0
Consolidated Entity Excluding Consolidated Funds
Investment Holdings [Line Items]
Total investments per Condensed Consolidated Balance Sheets	52.9	67.9
Consolidated Entity Excluding Consolidated Funds | Other investments
Investment Holdings [Line Items]
Investments	19.9	19.4
Consolidated Entity Excluding Consolidated Funds | Investments related to long-term incentive compensation plans
Investment Holdings [Line Items]
Investments	$ 33.0	$ 48.5