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Commitments - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 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 | Employee	5,200
Floating Rate Reverse Mortgage Loans
Other Commitments [Line Items]
Additional borrowing capacity to borrowers	$ 2,100.0	$ 2,000.0
Funded amount in connection with reverse mortgage loans	147.6
Forward Mortgage Loan Interest Rate Lock Commitments
Other Commitments [Line Items]
Short-term commitments to lend	1,200.0
Reverse loans IRLCs
Other Commitments [Line Items]
Short-term commitments to lend	$ 80.5
New Residential Investment Corp
Other Commitments [Line Items]
Servicing agreements notice of termination	180 days
Customer Concentration Risk | Unpaid Principal Balance | New Residential Investment Corp
Other Commitments [Line Items]
Concentration risk (percent)	24.00%
Customer Concentration Risk | Loan Count | New Residential Investment Corp
Other Commitments [Line Items]
Concentration risk (percent)	34.00%
Customer Concentration Risk | Delinquent Loans | New Residential Investment Corp
Other Commitments [Line Items]
Concentration risk (percent)	62.00%

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