Commitments and Contingencies - Schedule of limited partners' callable commitments (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	$ 121.8	$ 275.5
Real Estate Funds
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	82.8	106.5
Real Estate Funds \| JCR Capital - REA Preferred Equity Parallel Fund
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	9.9	11.5
Real Estate Funds \| Silverpeak NRE FundCo 3 LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	10.4	31.9
Real Estate Funds \| Townsend Group Value-Add Fund
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	29.7	29.7
Real Estate Funds \| Silverpeak NRE FundCo LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	3.7	4.3
Real Estate Funds \| SP V - II, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	6.4	6.4
Real Estate Funds \| Silverpeak NRE FundCo 2 LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	22.7	22.7
Loans Receivable
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	39.0	43.0
Loans Receivable \| Project Sonic Senior Loan
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	1.9	1.9
Loans Receivable \| Project Sonic Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	0.6	0.6
Loans Receivable \| One Biscayne Tower Senior Loan
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	22.8	25.1
Loans Receivable \| One Biscayne Tower Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	7.6	8.3
Loans Receivable \| MRA Hub 34 Holding, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	1.5	1.5
Loans Receivable \| The Reserve at Chino Hills
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	0.0	0.9
Loans Receivable \| 735 Watkins Mill
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	4.6	4.7
Real Estate Operating Business
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	0.0	126.0
Real Estate Operating Business \| DataBank
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS	$ 0.0	$ 126.0