Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	$ 3,208.8	$ 3,025.9	$ 2,825.3	$ 2,547.4	$ 2,466.3
Assets serviced	205,300.0		191,100.0
UPB of loans transferred	70,808.2		64,876.2
MSR related financing liabilities, at fair value	729.0		842.0
Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Assets at Fair Value [Line Items]
MSR related financing liabilities, at fair value	457.5		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	80.6
Rithm Capital Corp \| Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Assets at Fair Value [Line Items]
MSR related financing liabilities, at fair value	80.6
Owned MSRs
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	2,746.2		2,244.3
Assets serviced	174,300.0		152,500.0
Financing Liability Excess Servicing Spread [Member]
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	368.7		373.5
Transferred MSR, Subject To Pledged Liability
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	462.6		581.0
Assets serviced	31,000.0		$ 38,600.0
Transferred MSR, Subject To Pledged Liability \| Rithm Capital Corp
Servicing Assets at Fair Value [Line Items]
Assets serviced	$ 6,800.0