Commitments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Commitments - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Threshold of outstanding principal balance on maximum claim amount (as a percent)	98.00%
Floating Rate Reverse Mortgage Loans
Other Commitments [Line Items]
Additional borrowing capacity to borrowers	$ 3,000.0	$ 3,100.0
Funded amount in connection with reverse mortgage loans	76.8
Forward Mortgage Loan Interest Rate Lock Commitments
Other Commitments [Line Items]
Short-term commitments to lend	1,600.0
Reverse loans IRLCs
Other Commitments [Line Items]
Short-term commitments to lend	$ 38.3
Rithm Capital Corp
Other Commitments [Line Items]
Mortgage Loans, Right To Transfer, Percentage	15.00%
Unpaid Principal Balance, Transfers Out	$ 5,700.0
Unpaid Principal Balance, Amount Expected to Deboard	$ 1,900.0
Customer Concentration Risk \| Servicing And Subservicing Fees Benchmark \| Rithm Capital Corp
Other Commitments [Line Items]
Concentration risk (percent)	14.00%
Concentration Risk, Amount	$ 22.2
Customer Concentration Risk \| Unpaid Principal Balance \| Rithm Capital Corp
Other Commitments [Line Items]
Concentration risk (percent)	11.00%
Concentration Risk, Amount	$ 34,700.0
Customer Concentration Risk \| Loan Count \| Rithm Capital Corp
Other Commitments [Line Items]
Concentration risk (percent)	21.00%
Customer Concentration Risk \| Delinquent Loans \| Rithm Capital Corp
Other Commitments [Line Items]
Concentration risk (percent)	58.00%
Customer Concentration Risk \| Pledged MSR Liability Expense Benchmark \| Rithm Capital Corp
Other Commitments [Line Items]
Concentration Risk, Amount	$ 9.0