Securitization Activities - Retained Interests in SPEs (Details) - USD ($) $ in Millions	Aug. 31, 2026	Nov. 30, 2025
Securitization Vehicles [Line Items]
Total RMBS securitization assets	$ 182.4	$ 405.7
Total CMBS securitization assets	621.2	1,108.2
CLOs	12,979.1	10,970.6
Consumer and other loans	2,862.2	2,596.7
U.S. government agency RMBS
Securitization Vehicles [Line Items]
Retained Interests	2.4	4.0
U.S. government agency CMBS
Securitization Vehicles [Line Items]
Retained Interests	1.0	1.1
CLOs
Securitization Vehicles [Line Items]
Retained Interests	102.9	436.6
Consumer and other loans
Securitization Vehicles [Line Items]
Retained Interests	$ 116.9	$ 104.9

Fair value portion of interest continued to be held by a transferor after transferring financial assets to a third party.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant