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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit $ in Thousands, € in Millions, £ in Millions, kr in Billions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2025 GBP (£)	Mar. 31, 2025 EUR (€)	Mar. 31, 2025 SEK (kr)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 SEK (kr)
Line of Credit Facility [Line Items]
Balance	$ 5,219,777	$ 4,814,973
Collateral	7,387,680	7,032,800
USD
Line of Credit Facility [Line Items]
Balance	0	0
JPMorgan
Line of Credit Facility [Line Items]
Balance	1,330,734	1,033,504
Collateral	1,886,169	1,832,859
Maximum Month-End Balance	1,330,734	1,063,261
Average Month-End Balance	1,152,849	969,759
JPMorgan | USD
Line of Credit Facility [Line Items]
Balance	1,330,734	1,033,504
DB
Line of Credit Facility [Line Items]
Balance	120,033	123,434
Collateral	195,669	199,217
Maximum Month-End Balance	123,434	278,703
Average Month-End Balance	122,301	201,020
DB | USD
Line of Credit Facility [Line Items]
Balance	120,033	123,434
Goldman | USD
Line of Credit Facility [Line Items]
Balance		0
Collateral		0
Maximum Month-End Balance		11,620
Average Month-End Balance		2,903
Goldman | Fx contracts - GBP
Line of Credit Facility [Line Items]
Balance	399,499	373,706
Collateral	517,703	485,054
Maximum Month-End Balance	399,499	390,163
Average Month-End Balance	387,209	251,571
CS Facility
Line of Credit Facility [Line Items]
Balance	540,413	462,886
Collateral	800,512	702,927
Maximum Month-End Balance	540,413	758,201
Average Month-End Balance	513,653	640,453
CS Facility | USD
Line of Credit Facility [Line Items]
Balance	540,413	462,886
HSBC Facility
Line of Credit Facility [Line Items]
Balance	650,929	627,646
Collateral	872,168	839,123
Maximum Month-End Balance	650,929	672,422
Average Month-End Balance	635,035	653,182
HSBC Facility | Fx contracts - GBP
Line of Credit Facility [Line Items]
Balance	389,607	377,483
HSBC Facility | Fx contracts - EUR
Line of Credit Facility [Line Items]
Balance	261,322	250,162
Barclays Facility
Line of Credit Facility [Line Items]
Balance	321,546	321,546
Collateral	422,548	420,774
Maximum Month-End Balance	321,546	353,153
Average Month-End Balance	321,546	242,792
Barclays Facility | USD
Line of Credit Facility [Line Items]
Balance	321,546	321,546
MUFG Facility
Line of Credit Facility [Line Items]
Balance	79,345	171,972
Collateral	166,934	209,493
Maximum Month-End Balance	110,772	211,057
Average Month-End Balance	92,179	197,420
MUFG Facility | Fx contracts - GBP
Line of Credit Facility [Line Items]
Balance	79,345	171,972
Churchill
Line of Credit Facility [Line Items]
Balance	119,982	121,289
Collateral	160,278
Maximum Month-End Balance	120,853
Average Month-End Balance	120,417
Churchill | USD
Line of Credit Facility [Line Items]
Balance	119,982	121,289
Santander Facility | USD
Line of Credit Facility [Line Items]
Balance	0	0
Collateral		0
Maximum Month-End Balance		67,500
Average Month-End Balance		56,250
Santander Facility | Fx contracts - EUR
Line of Credit Facility [Line Items]
Balance		0
Collateral		0
Maximum Month-End Balance		54,677
Average Month-End Balance		22,684
Barclays Securitization
Line of Credit Facility [Line Items]
Balance	1,667,312	1,587,779	£ 724.7	€ 493.2	kr 2.0	£ 716.8	€ 493.9	kr 2.0
Collateral	2,296,668	2,182,088
Maximum Month-End Balance	1,667,312	2,249,538
Average Month-End Balance	1,614,412	2,041,421
Revolving Credit Facility
Line of Credit Facility [Line Items]
Balance	0	0
Collateral	69,031	0
Maximum Month-End Balance	0	150,000
Average Month-End Balance	0	38,796
Churchill Facility
Line of Credit Facility [Line Items]
Collateral		161,264
Maximum Month-End Balance		126,080
Average Month-End Balance		123,684
JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse, Barclays Facility, HSBC Facilities And Barclays Securitization
Line of Credit Facility [Line Items]
Balance	$ 5,229,793	$ 4,823,762

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