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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Parenthetical) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)
Debt Instrument [Line Items]
Percentage of secured debt that is recourse debt	36.00%	46.00%
Line of Credit
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 7,504,607	$ 6,936,201
Line of Credit | Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 200,000	$ 700,000
Line of Credit | Weighted Average
Debt Instrument [Line Items]
Weighted average advance rate	73.45%	68.60%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 275,000		$ 160,000
Fx contracts - GBP | Line of Credit
Debt Instrument [Line Items]
Currency conversion rate	1.3446	1.25
Fx contracts - GBP | Line of Credit | Weighted Average
Debt Instrument [Line Items]
Weighted average rate	1.99%	2.43%
Weighted average advance rate	76.30%	75.30%
Fx contracts - EUR | Line of Credit
Debt Instrument [Line Items]
Currency conversion rate	1.17	1.04
Fx contracts - EUR | Line of Credit | Credit Suisse Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 281,611
Fx contracts - EUR | Line of Credit | Weighted Average
Debt Instrument [Line Items]
Weighted average rate	2.26%	2.11%
Weighted average advance rate	71.10%	70.80%
SEK | Line of Credit
Debt Instrument [Line Items]
Currency conversion rate	0.11	0.09
SEK | Line of Credit | Weighted Average
Debt Instrument [Line Items]
Weighted average rate	1.50%	1.50%
Weighted average advance rate	80.10%	80.20%
USD | Line of Credit
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 275,000	$ 160,000
USD | Line of Credit | JP Morgan Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	2,000,000	1,500,000
USD | Line of Credit | Credit Suisse Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	800,000	800,000
USD | Line of Credit | Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 200,000	$ 700,000
USD | Line of Credit | Weighted Average
Debt Instrument [Line Items]
Weighted average rate	2.02%	2.47%
Weighted average advance rate	71.90%	62.20%

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