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Fair value measurements - Summary of assets measured on a recurring basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Securitized Debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ (5,491,967) $ (4,711,623)
Transfers out of level 3   0
Purchases 0 0
Issuances of Securitized Debt (2,735,729) (1,372,097)
Capital distributions 0 0
Proceeds from sales or settlements 0 0
Principal repayments 1,236,013 657,092
Principal funding 0 0
Total net gains/(losses)    
Other 0 0
Ending Balance (7,177,923) (5,491,967)
Securitized Debt | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings (23,561) (30,310)
Securitized Debt | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings 0 0
Securitized Debt | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings (162,679) (35,029)
Securitized Debt | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings 0 0
Securitized Debt | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held (22,448) (30,310)
Securitized Debt | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held (162,333) (35,029)
Securitized Debt | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held 0 0
Other liabilities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (336) (7)
Transfers out of level 3   0
Purchases 0 0
Issuances of Securitized Debt 0 0
Capital distributions 0 0
Proceeds from sales or settlements 1,190 1,379
Principal repayments 0 0
Principal funding 0 0
Total net gains/(losses)    
Other 0 0
Ending Balance 0 (336)
Other liabilities | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings 0 0
Other liabilities | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings (1,190) (1,379)
Other liabilities | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings 336 (329)
Other liabilities | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings 0 0
Other liabilities | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held 0 0
Other liabilities | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held 0 (336)
Other liabilities | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held 0 0
Residential Mortgage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 6,416,066 5,675,135
Transfers out of level 3 (1,600) (1,629)
Purchases 3,032,638 1,746,012
Issuances of Securitized Debt 0 0
Capital distributions 0 0
Proceeds from sales or settlements (407,158) (355,229)
Principal repayments (1,039,354) (710,639)
Principal funding 17,691 2,070
Total net gains/(losses)    
Other (9,728) (3,098)
Ending Balance 8,198,215 6,416,066
Residential Mortgage | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 2,459 14,839
Residential Mortgage | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings (4,785) 6,352
Residential Mortgage | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 190,386 42,253
Residential Mortgage | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
Residential Mortgage | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 2,838 14,753
Residential Mortgage | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 185,549 41,011
Residential Mortgage | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
Legacy WMC Commercial loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 67,005 66,303
Transfers out of level 3   0
Purchases 0 0
Issuances of Securitized Debt 0 0
Capital distributions 0 0
Proceeds from sales or settlements 0 0
Principal repayments 0 0
Principal funding 0 0
Total net gains/(losses)    
Other 0 0
Ending Balance 55,376 67,005
Legacy WMC Commercial loans | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings (229) 434
Legacy WMC Commercial loans | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
Legacy WMC Commercial loans | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings (11,400) 268
Legacy WMC Commercial loans | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
Legacy WMC Commercial loans | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations (229) 434
Legacy WMC Commercial loans | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations (11,400) 268
Legacy WMC Commercial loans | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
Non-Agency RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 115,533 37,533
Transfers out of level 3   0
Purchases 80,731 95,395
Issuances of Securitized Debt 0 0
Capital distributions 0 0
Proceeds from sales or settlements 0 (20,289)
Principal repayments (10,668) (1,847)
Principal funding 0 0
Total net gains/(losses)    
Other 0 0
Ending Balance 191,546 115,533
Non-Agency RMBS | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings (2,835) 17
Non-Agency RMBS | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 (87)
Non-Agency RMBS | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 8,785 4,811
Non-Agency RMBS | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
Non-Agency RMBS | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations (2,835) 17
Non-Agency RMBS | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 8,785 4,811
Non-Agency RMBS | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 5,796
Transfers out of level 3 (5,800) (5,796)
Purchases   0
Issuances of Securitized Debt   0
Capital distributions   0
Proceeds from sales or settlements   0
Principal repayments   0
Principal funding   0
Total net gains/(losses)    
Other   0
Ending Balance   0
CMBS | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   0
CMBS | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   0
CMBS | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   0
CMBS | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   0
CMBS | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations   0
CMBS | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations   0
CMBS | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations   0
Legacy WMC Other Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 1,156
Transfers out of level 3   0
Purchases   0
Issuances of Securitized Debt   0
Capital distributions   0
Proceeds from sales or settlements   (762)
Principal repayments   0
Principal funding   0
Total net gains/(losses)    
Other   0
Ending Balance   0
Legacy WMC Other Securities | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   (185)
Legacy WMC Other Securities | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   (227)
Legacy WMC Other Securities | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   18
Legacy WMC Other Securities | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings   0
Legacy WMC Other Securities | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations   0
Legacy WMC Other Securities | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations   0
Legacy WMC Other Securities | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations   0
Other assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 204 1,172
Transfers out of level 3   0
Purchases 0 0
Issuances of Securitized Debt 0 0
Capital distributions 0 0
Proceeds from sales or settlements (1,098) (2,739)
Principal repayments 0 0
Principal funding 0 0
Total net gains/(losses)    
Other 0 0
Ending Balance 0 204
Other assets | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
Other assets | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 1,098 2,739
Other assets | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings (204) (968)
Other assets | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
Other assets | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
Other assets | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 204
Other assets | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
AG Arc    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 30,778 33,574
Transfers out of level 3   0
Purchases 15,330 0
Issuances of Securitized Debt 0 0
Capital distributions (628) (5,042)
Proceeds from sales or settlements 0 0
Principal repayments 0 0
Principal funding 0 0
Total net gains/(losses)    
Other 0 0
Ending Balance 50,016 30,778
AG Arc | Net premium and discount amortization    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
AG Arc | Net realized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
AG Arc | Net unrealized gain/(loss)    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 0 0
AG Arc | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings 4,536 2,246
AG Arc | Level 3 | Net premium and discount amortization    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
AG Arc | Level 3 | Net unrealized gain/(loss)    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations 0 0
AG Arc | Level 3 | Equity in earnings/(loss) from affiliates    
Total net gains/(losses)    
Unrealized gains/(losses) recorded in the consolidated statement of operations $ 4,536 $ 2,246