Variable Interest Entities - Narrative (Details)	3 Months Ended
	Mar. 31, 2025 USD ($) collateralized_loan_obligation loan	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Variable interest entities
Number of CLOs | collateralized_loan_obligation	6
Number of SASBs | loan	1
VIE assets	$ 62,163,347,000	$ 62,556,497,000
VIE liabilities	55,006,596,000	55,363,025,000
Temporary equity	426,835,000	426,695,000	$ 415,485,000	$ 414,348,000
Investments in unconsolidated entities	$ 98,462,000	$ 99,370,000
CMBS JV
Variable interest entities
Ownership percentage	51.00%
Primary Beneficiary
Variable interest entities
VIE assets	$ 63,800,000
VIE liabilities	100,000
Primary Beneficiary | CMBS Venture Holdings
Variable interest entities
VIE assets	226,600,000
VIE liabilities	58,200,000
Primary Beneficiary | SPT Dolphin
Variable interest entities
VIE assets	2,100,000,000
VIE liabilities	0
Primary Beneficiary | Woodstar Feeder Fund, L.P.
Variable interest entities
VIE assets	600,000,000
VIE liabilities	0
Temporary equity	400,000,000
Not primary beneficiary
Variable interest entities
Maximum risk of loss related to VIEs, on fair value basis	31,300,000
Not primary beneficiary | Measurement Period Adjustments
Variable interest entities
Investments in unconsolidated entities	6,400,000
Not primary beneficiary | Securitization SPEs
Variable interest entities
Long-term debt, gross	$ 4,700,000,000