Debt - Narrative (Details)		1 Months Ended		6 Months Ended
	Jan. 28, 2022 USD ($) term	Jul. 31, 2021 USD ($) loan	Oct. 31, 2019 USD ($)	Jun. 30, 2023 USD ($) loan counterparty	May 26, 2023	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Feb. 19, 2022	Jan. 27, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 17, 2021
Debt Instrument [Line Items]
Unpaid principal balance				$ 2,858,915,000
Carrying value of CRE debt investments				106,728,000		$ 145,836,000	$ 106,247,000	$ 44,378,000	$ 34,004,000			$ 36,598,000
Principal amount				$ 2,858,915,000			3,169,278,000
Investment grade notes | CLNC 2019-FL1
Debt Instrument [Line Items]
Sale of notes			$ 840,400,000
Advance rate				66.20%
Number of loans (in loans) | loan				15
Reinvestment period			2 years
Number of loan investments removed (in loans) | loan				2
Number of loan investments removed, partially repaid (in loans) | loan				1
Debt repaid				$ 136,300,000
Debt removed				97,700,000
Unpaid principal balance				$ 491,300,000
Number of counterparties holding collateral that exceeds amounts borrowed by more than 10% | counterparty				1
Investment grade notes | BRSP 2021-FL 1
Debt Instrument [Line Items]
Sale of notes		$ 670,000,000
Advance rate		83.75%
Number of loans (in loans) | loan		28
Reinvestment period		2 years
Debt repaid				$ 62,100,000
Unpaid principal balance				$ 800,000,000
Number of loans repaid | loan				3
Investment grade notes | Secured Overnight Financing Rate (SOFR) | CLNC 2019-FL1
Debt Instrument [Line Items]
Benchmark adjustment					1144.80%					0.11448%			0.11448%
Additional lookback period				2 days
Investment grade notes | LIBOR | BRSP 2021-FL 1
Debt Instrument [Line Items]
Weighted average cost of funds percentage		1.49%
Master repurchase facilities
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,000,000,000
Master repurchase facilities
Debt Instrument [Line Items]
Unpaid principal balance				1,217,251,000
Principal amount				$ 1,217,251,000			1,339,993,000
Master repurchase facilities | Minimum
Debt Instrument [Line Items]
Initial debt term (in years)				2 years
Master repurchase facilities | Maximum
Debt Instrument [Line Items]
Initial debt term (in years)				5 years
Master repurchase facilities | Bank 1
Debt Instrument [Line Items]
Unpaid principal balance				$ 216,400,000
Master repurchase facilities | Revolving credit facility | Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 165,000,000										$ 300,000,000
Borrowing capacity, increase to maximum available principal amount											$ 300,000,000
Maximum amount that can be drawn				$ 165,000,000
Maximum amount of base value available for borrowing				50.00%
Number of additional terms (in terms) | term	2
Length of potential extension terms	6 months
Tangible net worth				$ 1,112,000,000
Percentage of net cash proceeds from offering				0.70
EBITDA plus lease expenses to fixed charges				1.50
Minimum interest coverage ratio				3.00
Maximum leverage ratio				0.80
Master repurchase facilities | Revolving credit facility | Credit agreement | Minimum
Debt Instrument [Line Items]
Unused amount, commitment fee percentage				0.25%
Master repurchase facilities | Revolving credit facility | Credit agreement | Maximum
Debt Instrument [Line Items]
Unused amount, commitment fee percentage				0.35%
Master repurchase facilities | Revolving credit facility | Credit agreement | Federal funds rate | Option two
Debt Instrument [Line Items]
Interest rate margin (in percentage)				0.50%
Master repurchase facilities | Revolving credit facility | Credit agreement | Secured Overnight Financing Rate (SOFR) | Option one
Debt Instrument [Line Items]
Interest rate margin (in percentage)				2.25%
Master repurchase facilities | Revolving credit facility | Credit agreement | Secured Overnight Financing Rate (SOFR) | Option two
Debt Instrument [Line Items]
Interest rate margin (in percentage)				1.00%
Margin on basis spread on variable rate				0.0125
Master repurchase facilities | Master repurchase facilities
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,000,000,000
Unpaid principal balance				1,200,000,000			1,300,000,000
Principal amount				1,217,251,000			1,339,993,000
Master repurchase facilities | Master repurchase facilities | Asset Pledged as Collateral
Debt Instrument [Line Items]
Carrying value of CRE debt investments				1,700,000,000			1,800,000,000
Master repurchase facilities | Master repurchase facilities | Bank 1
Debt Instrument [Line Items]
Maximum borrowing capacity				600,000,000
Principal amount				$ 512,430,000			415,892,000
Master repurchase facilities | Master repurchase facilities | Bank 1 | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate margin (in percentage)				2.17%
Letters of Credit | Revolving credit facility | Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000,000
Securitization bonds payable, net
Debt Instrument [Line Items]
Unpaid principal balance				$ 995,187,000
Principal amount				995,187,000			1,172,717,000
Securitization bonds payable, net | Asset Pledged as Collateral
Debt Instrument [Line Items]
Carrying value of CRE debt investments				1,300,000,000			1,500,000,000
Securitization bonds payable, net | Investment grade notes | CLNC 2019-FL1
Debt Instrument [Line Items]
Principal amount				325,187,000			502,717,000
Securitization bonds payable, net | Investment grade notes | BRSP 2021-FL 1
Debt Instrument [Line Items]
Principal amount				$ 670,000,000			$ 670,000,000
Securitization bonds payable, net | Investment grade notes | Minimum | CLNC 2019-FL1
Debt Instrument [Line Items]
Initial debt term (in years)				2 years
Securitization bonds payable, net | Investment grade notes | Maximum | CLNC 2019-FL1
Debt Instrument [Line Items]
Initial debt term (in years)				3 years
Securitization bonds payable, net | Investment grade notes | Secured Overnight Financing Rate (SOFR) | CLNC 2019-FL1
Debt Instrument [Line Items]
Interest rate margin (in percentage)				2.14%
Securitization bonds payable, net | Investment grade notes | Secured Overnight Financing Rate (SOFR) | BRSP 2021-FL 1
Debt Instrument [Line Items]
Interest rate margin (in percentage)				1.49%