Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	$ 3,025.9	$ 2,825.3	$ 2,466.3
Assets serviced	200,100.0	191,100.0
UPB of loans transferred	67,477.0	64,876.2
MSR related financing liabilities, at fair value	794.6	842.0
Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Assets at Fair Value [Line Items]
MSR related financing liabilities, at fair value	541.2	573.2
Original Rights to Mortgage Servicing Rights Agreements \| Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Assets at Fair Value [Line Items]
MSR related financing liabilities, at fair value	84.2
Rithm Capital Corp \| Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Assets at Fair Value [Line Items]
MSR related financing liabilities, at fair value	84.2
Owned MSRs
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	2,479.3	2,244.3
Assets serviced	162,900.0	152,500.0
Financing Liability Excess Servicing Spread [Member]
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	343.0	373.5
Transferred MSR, Subject To Pledged Liability
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	546.6	581.0
Assets serviced	37,200.0	$ 38,600.0
Transferred MSR, Subject To Pledged Liability \| Rithm Capital Corp
Servicing Assets at Fair Value [Line Items]
Assets serviced	$ 6,900.0