Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Property, Plant and Equipment [Line Items]
Finance lease, right-of-use asset, after accumulated amortization	$ 553.5	$ 527.9
Leasehold improvements	223.3	259.7
Accumulated depreciation and amortization	(473.2)	(427.2)
Depreciation and amortization	$ 73.8	$ 74.7	$ 67.0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Premises and equipment	Premises and equipment
Minimum
Property, Plant and Equipment [Line Items]
Useful life of premises and equipment	3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life of premises and equipment	10 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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Indicates line item in statement of financial position that includes finance lease right-of-use asset.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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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.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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