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Commitments - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) Employee	Dec. 31, 2021 USD ($)	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	5,800
Floating Rate Reverse Mortgage Loans
Other Commitments [Line Items]
Additional borrowing capacity to borrowers	$ 1,700.0	$ 1,500.0
Funded amount in connection with reverse mortgage loans	56.4
Forward Mortgage Loan Interest Rate Lock Commitments
Other Commitments [Line Items]
Short-term commitments to lend	569.8
Reverse loans IRLCs
Other Commitments [Line Items]
Short-term commitments to lend	$ 47.8
NRZ
Other Commitments [Line Items]
Servicing agreements notice of termination	180 days
Customer Concentration Risk | Unpaid Principal Balance | NRZ
Other Commitments [Line Items]
Concentration risk (percent)	19.00%
Customer Concentration Risk | Loan Count | NRZ
Other Commitments [Line Items]
Concentration risk (percent)	30.00%
Customer Concentration Risk | Delinquent Loans | NRZ
Other Commitments [Line Items]
Concentration risk (percent)	68.00%

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