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Investments - Schedule of Investments as a Percentage of Investments of Consolidated Funds (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Investments of Consolidated Funds $ 7,782.4 $ 7,253.1
Percentage of investments in Consolidated Funds 100.00% 100.00%
Minimum percent of aggregate assets for individual investments with fair value 5.00%  
Assets of the CLOs - Equity    
Schedule of Investments [Line Items]    
Assets of CLOs $ 0.1 $ 1.3
Percentage of assets of the CLOs 0.01% 0.02%
United States    
Schedule of Investments [Line Items]    
Investments of Consolidated Funds $ 4,801.1 $ 4,086.4
Percentage of investments in Consolidated Funds 61.69% 56.34%
United States | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 520.9 $ 374.3
Percentage of equity securities 6.69% 5.16%
Cost of total assets $ 543.7 $ 397.3
United States | Partnership and LLC interests    
Schedule of Investments [Line Items]    
Fund investments $ 312.7 $ 490.9
Percentage of fund investments 4.02% 6.77%
Cost of total assets $ 194.8 $ 389.2
United States | Loans    
Schedule of Investments [Line Items]    
Loans $ 29.0 $ 38.7
Loans percentage 0.37% 0.53%
Cost of total assets $ 24.0 $ 36.3
United States | Assets of the CLOs - Bonds    
Schedule of Investments [Line Items]    
Assets of CLOs $ 90.1 $ 80.5
Percentage of assets of the CLOs 1.16% 1.11%
United States | Assets of the CLOs - Equity    
Schedule of Investments [Line Items]    
Assets of CLOs $ 3.8 $ 2.0
Percentage of assets of the CLOs 0.05% 0.03%
United States | Assets of the CLOs - Loans    
Schedule of Investments [Line Items]    
Assets of CLOs $ 3,844.6 $ 3,100.0
Percentage of assets of the CLOs 49.40% 42.74%
United States | Total assets of the CLOs    
Schedule of Investments [Line Items]    
Assets of CLOs $ 3,938.5 $ 3,182.5
Percentage of assets of the CLOs 50.61% 43.88%
Cost of total assets $ 3,943.3 $ 3,256.0
Europe    
Schedule of Investments [Line Items]    
Investments of Consolidated Funds $ 2,863.7 $ 3,091.8
Percentage of investments in Consolidated Funds 36.81% 42.63%
Europe | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 10.6 $ 0.0
Percentage of equity securities 0.14% 0.00%
Cost of total assets $ 10.7 $ 0.0
Europe | Assets of the CLOs - Bonds    
Schedule of Investments [Line Items]    
Assets of CLOs $ 373.1 $ 437.9
Percentage of assets of the CLOs 4.79% 6.04%
Europe | Assets of the CLOs - Loans    
Schedule of Investments [Line Items]    
Assets of CLOs $ 2,479.9 $ 2,652.6
Percentage of assets of the CLOs 31.87% 36.57%
Europe | Total assets of the CLOs    
Schedule of Investments [Line Items]    
Assets of CLOs $ 2,853.1 $ 3,091.8
Percentage of assets of the CLOs 36.67% 42.63%
Cost of total assets $ 2,889.4 $ 3,231.8
Global    
Schedule of Investments [Line Items]    
Investments of Consolidated Funds $ 117.6 $ 74.9
Percentage of investments in Consolidated Funds 1.50% 1.03%
Global | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 37.9 $ 0.0
Percentage of equity securities 0.48% 0.00%
Cost of total assets $ 39.9 $ 0.0
Global | Assets of the CLOs - Bonds    
Schedule of Investments [Line Items]    
Assets of CLOs $ 1.9 $ 4.1
Percentage of assets of the CLOs 0.02% 0.06%
Global | Assets of the CLOs - Loans    
Schedule of Investments [Line Items]    
Assets of CLOs $ 77.8 $ 70.8
Percentage of assets of the CLOs 1.00% 0.97%
Global | Total assets of the CLOs    
Schedule of Investments [Line Items]    
Assets of CLOs $ 79.7 $ 74.9
Percentage of assets of the CLOs 1.02% 1.03%
Cost of total assets $ 80.7 $ 77.3
Business Services | United States | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 30.0 $ 0.0
Percentage of equity securities 0.39% 0.00%
Infrastructure | United States | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 361.3 $ 366.5
Percentage of equity securities 4.64% 5.05%
Technology | United States | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 17.3 $ 0.0
Percentage of equity securities 0.22% 0.00%
Transportation | United States | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 29.1 $ 0.0
Percentage of equity securities 0.37% 0.00%
Other | United States | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 83.2 $ 7.8
Percentage of equity securities 1.07% 0.11%
Aerospace & Defense | United States | Loans    
Schedule of Investments [Line Items]    
Loans $ 9.3 $ 10.1
Loans percentage 0.12% 0.14%
Collateralized Debt Obligation | United States | Loans    
Schedule of Investments [Line Items]    
Loans $ 7.2 $ 13.0
Loans percentage 0.09% 0.18%
Environmental Industries | United States | Loans    
Schedule of Investments [Line Items]    
Loans $ 0.9 $ 0.9
Loans percentage 0.01% 0.01%
Education | United States | Loans    
Schedule of Investments [Line Items]    
Loans $ 11.6 $ 14.7
Loans percentage 0.15% 0.20%
Software & Services | Europe | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 10.6 $ 0.0
Percentage of equity securities 0.14% 0.00%
Consumer Services | Global | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 28.3 $ 0.0
Percentage of equity securities 0.36% 0.00%
Hardware | Global | Equity securities    
Schedule of Investments [Line Items]    
Equity securities $ 9.6 $ 0.0
Percentage of equity securities 0.12% 0.00%