Variable Interest Entities - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) loan collateralized_loan_obligation	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Variable interest entities
Number of CLOs | collateralized_loan_obligation	5
Number of SASBs | loan	1
VIE assets	$ 69,504,196,000	$ 79,043,129,000
VIE liabilities	62,481,214,000	71,844,422,000
Temporary Equity: Redeemable non-controlling interests	414,348,000	362,790,000	$ 214,915,000	$ 0
Investments in unconsolidated entities	$ 90,376,000	$ 91,892,000
CMBS JV
Variable interest entities
Participation / Ownership %	51.00%
Primary beneficiary
Variable interest entities
VIE assets	$ 47,800,000
VIE liabilities	10,300,000
Primary beneficiary | CMBS Venture Holdings
Variable interest entities
VIE assets	313,300,000
VIE liabilities	68,600,000
Primary beneficiary | SPT Dolphin
Variable interest entities
VIE assets	2,000,000,000
VIE liabilities	0
Primary beneficiary | Woodstar Feeder Fund, L.P.
Variable interest entities
VIE assets	600,000,000
VIE liabilities	0
Temporary Equity: Redeemable non-controlling interests	400,000,000
Not primary beneficiary
Variable interest entities
Maximum risk of loss related to VIEs, on fair value basis	18,600,000
Not primary beneficiary | Measurement Period Adjustments
Variable interest entities
Investments in unconsolidated entities	800,000
Not primary beneficiary | Securitization SPEs
Variable interest entities
Long term debt, gross	$ 4,300,000,000