MSR Related Financing Liabilities, at Fair Value - Rithm Transaction (Details) - Rithm Capital Corp - USD ($) $ in Billions	1 Months Ended	3 Months Ended	9 Months Ended
Jun. 30, 2026	May 31, 2026	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2026
Servicing Assets at Fair Value [Line Items]
RMSR			$ 3.4			$ 4.6
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Assets at Fair Value [Line Items]
RMSR			3.4	$ 0.0	$ 1.2	4.6
Subservicing	$ 10.0	$ 11.2	$ 0.6	$ 21.2	$ 0.6	$ 22.4

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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