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Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 70.9 $ 83.8
Less accumulated depreciation and amortization (50.7) (70.2)
Premises and equipment, net 20.2 13.7
Computer Hardware    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 25.6 25.5
Operating Lease ROU Assets    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 21.0 22.9
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 5.3 13.8
Computer Software    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 15.7 17.0
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 3.3 $ 4.7