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Commitments - Narrative (Details) $ in Millions		6 Months Ended
	Jun. 17, 2021 USD ($) Employees Loan	Jun. 30, 2021 USD ($) Employee	Dec. 31, 2020 USD ($)	Dec. 21, 2020 USD ($)
Other Commitments [Line Items]
Threshold of outstanding principal balance on maximum claim amount (as a percent)		98.00%
Investment in equity method investee				$ 250.0
Number of employees retained	270	5,200
Floating Rate Reverse Mortgage Loans
Other Commitments [Line Items]
Additional borrowing capacity to borrowers		$ 2,000.0	$ 2,000.0
Funded amount in connection with reverse mortgage loans		91.8
Forward Mortgage Loan Interest Rate Lock Commitments
Other Commitments [Line Items]
Short-term commitments to lend		995.0
Reverse loans IRLCs
Other Commitments [Line Items]
Short-term commitments to lend		$ 68.4
New Residential Investment Corp
Other Commitments [Line Items]
Servicing agreements notice of termination		180 days
RMS
Other Commitments [Line Items]
Number of reverse loans serviced | Loan	37,000
Unpaid principal balance of reverse loans serviced | Loan	8,400,000,000
Aggregate purchase price	$ 12.4
Customer Concentration Risk | Unpaid Principal Balance | New Residential Investment Corp
Other Commitments [Line Items]
Concentration risk (percent)		26.00%
Customer Concentration Risk | Loan Count | New Residential Investment Corp
Other Commitments [Line Items]
Concentration risk (percent)		36.00%
Customer Concentration Risk | Delinquent Loans | New Residential Investment Corp
Other Commitments [Line Items]
Concentration risk (percent)		63.00%

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