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Investment in Equity Method Investee and Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
UPB of MSRs sold	$ 40.7	$ 11,100.0
MAV Canopy HoldCo I, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	15.00%
MSR Asset Vehicle LLC
Schedule of Equity Method Investments [Line Items]
Unpaid principal balance of loans subserviced	$ 56,700.0
MSR Asset Vehicle LLC | Mortgage Servicing Rights Title Transferred
Schedule of Equity Method Investments [Line Items]
UPB of rights to MSRs sold	29,200.0
Joint Marketing and Recapture Agreement
Schedule of Equity Method Investments [Line Items]
UPB of MSRs sold	25.0	261.3
Other MSR Purchase and Sale Agreement
Schedule of Equity Method Investments [Line Items]
UPB of MSRs sold	$ 6,800.0	$ 6,900.0

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- Definition

Unpaid principal balance of loans subserviced.

+ References

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- Definition

Amount of contractual principal due at origination of mortgage loan within 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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