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Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2022
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization $ (816.1) $ (551.5)  
Depreciation and amortization 190.3 112.2 $ 172.9
Premises and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 1,510.0 $ 1,160.0  
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