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Commitments - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
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	$ 1,800.0	$ 1,800.0
Funded amount in connection with reverse mortgage loans	198.6
Forward Mortgage Loan Interest Rate Lock Commitments
Other Commitments [Line Items]
Short-term commitments to lend	916.9
Reverse loans IRLCs
Other Commitments [Line Items]
Short-term commitments to lend	$ 20.2
Customer Concentration Risk | Servicing And Subservicing Fees Benchmark | Rithm
Other Commitments [Line Items]
Concentration risk (percent)	32.00%
Concentration Risk, Amount	$ 175.1
Customer Concentration Risk | Servicing And Subservicing Fees Benchmark | MAV Asset Vehicle LLC
Other Commitments [Line Items]
Concentration risk (percent)	10.00%
Concentration Risk, Amount	$ 54.9
Customer Concentration Risk | Unpaid Principal Balance | Rithm Capital Corp
Other Commitments [Line Items]
Concentration risk (percent)	16.00%
Customer Concentration Risk | Unpaid Principal Balance | MAV Asset Vehicle LLC
Other Commitments [Line Items]
Concentration risk (percent)	19.00%
Customer Concentration Risk | Loan Count | Rithm Capital Corp
Other Commitments [Line Items]
Concentration risk (percent)	26.00%
Customer Concentration Risk | Loan Count | MAV Asset Vehicle LLC
Other Commitments [Line Items]
Concentration risk (percent)	15.00%
Customer Concentration Risk | Delinquent Loans | Rithm
Other Commitments [Line Items]
Concentration risk (percent)	68.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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