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Mortgage Servicing - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing Asset at Amortized Cost [Line Items]
UPB of portfolio loans acquired	$ 46,800.0	$ 15,700.0	$ 75,600.0	$ 31,700.0
Float balances		1,540.0	2,070.0	1,740.0
Purchase of MSRs	$ 575.3	181.6	844.1	285.1
Agency and Non-Agency Mortgage Servicing Rights
Servicing Asset at Amortized Cost [Line Items]
UPB of MSRs sold		$ 11,700.0	$ 32.0	$ 80.0

X

- Definition

This represents the unpaid principal balance of loans for which servicing rights has been acquired during the period.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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X

- 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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Balance Type:	credit
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X

- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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