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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Depreciation expense $ 1.8 $ 2.6  
Amortization of debt issuance costs and discount 2.8 2.5  
Amortization of intangibles 1.5 0.6  
Total Assets 12,627.0 12,297.8 $ 12,399.2
Servicing      
Segment Reporting Information [Line Items]      
Depreciation expense 0.2 0.2  
Amortization of debt issuance costs and discount 0.1 0.2  
Amortization of intangibles 1.5 0.6  
Servicing | Operating Segments      
Segment Reporting Information [Line Items]      
Total Assets 11,553.4 11,251.8 11,535.0
Originations      
Segment Reporting Information [Line Items]      
Depreciation expense 0.1 0.1  
Amortization of debt issuance costs and discount 0.0 0.0  
Amortization of intangibles 0.0 0.0  
Originations | Operating Segments      
Segment Reporting Information [Line Items]      
Total Assets 774.0 610.9 570.5
Corporate Items and Other      
Segment Reporting Information [Line Items]      
Depreciation expense 1.5 2.3  
Amortization of debt issuance costs and discount 2.7 2.3  
Amortization of intangibles 0.0 0.0  
Corporate Items and Other | Operating Segments      
Segment Reporting Information [Line Items]      
Total Assets $ 299.6 $ 435.1 $ 293.7