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Investment in Equity Method Investee (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	May 03, 2021	Dec. 31, 2021	Dec. 21, 2021	Jun. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Ownership percentage	4.90%
UIPB of loans subserviced		$ 33,000.0
UPB of loans sub-serviced still on balance sheet		24,000.0
UPB of portfolio loans acquired		$ 75,600.0		$ 46,800.0	$ 31,700.0	$ 14,600.0
MAV Canopy HoldCo I LLC
Schedule of Equity Method Investments [Line Items]
Investment in equity method investee			$ 250.0
Ownership percentage		15.00%	15.00%
Capital contribution	$ 5.0
MAV Canopy HoldCo I LLC | Oaktree
Schedule of Equity Method Investments [Line Items]
Ownership percentage			85.00%
Forward Bulk Servicing Rights Purchase and Sale Agreement
Schedule of Equity Method Investments [Line Items]
UPB of MSRs sold		$ 4,300.0
Bulk Mortgage Servicing Rights Purchase and Sale Agreements
Schedule of Equity Method Investments [Line Items]
UPB of MSRs sold		20,700.0
Revaluation gain on pledged MSR liability		1.8
Maximum
Schedule of Equity Method Investments [Line Items]
Management fee expense		$ 0.5

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Unpaid principal balance of loans sub-serviced still on balance sheet.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from sale.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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