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Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Investment Holdings [Line Items]    
Total investments per Condensed Consolidated Balance Sheets $ 121.1 $ 98.6
Consolidated Funds    
Investment Holdings [Line Items]    
Investments 53.2 33.9
Total investments per Condensed Consolidated Balance Sheets 53.2 33.9
Consolidated Entity Excluding Consolidated Funds    
Investment Holdings [Line Items]    
Total investments per Condensed Consolidated Balance Sheets 67.9 64.7
Consolidated Entity Excluding Consolidated Funds | Other investments    
Investment Holdings [Line Items]    
Investments 20.8 20.0
Consolidated Entity Excluding Consolidated Funds | Investments related to long-term incentive compensation plans    
Investment Holdings [Line Items]    
Investments $ 47.1 $ 44.7