MSR Related Financing Liabilities, at Fair Value - Schedule of Assets, Liabilities Related to MSR Transfer Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities, at fair value	$ 729.0	$ 842.0
Assets serviced	205,300.0	191,100.0
Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities, at fair value	457.5	573.2
Transferred MSR, Subject To Pledged Liability
Servicing Liabilities at Fair Value [Line Items]
Assets serviced	31,000.0	$ 38,600.0
Original Rights to Mortgage Servicing Rights Agreements \| Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities, at fair value	80.6
Rithm Capital Corp \| Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities, at fair value	80.6
Rithm Capital Corp \| Transferred MSR, Subject To Pledged Liability
Servicing Liabilities at Fair Value [Line Items]
Assets serviced	6,800.0
Rithm Capital Corp \| Transferred MSR, Expected To Transfer Upon Receipt Of Required Consent
Servicing Liabilities at Fair Value [Line Items]
Assets serviced	$ 3,400.0