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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Depreciation expense $ 10.5 $ 10.3 $ 19.1
Amortization of debt discount and issuance costs 10.1 7.8 7.0
Amortization of Intangible Assets 4.3 0.7 0.0
Servicing      
Segment Reporting Information [Line Items]      
Depreciation expense 0.9 0.7 0.9
Amortization of debt discount and issuance costs 0.8 0.7 0.5
Amortization of Intangible Assets 4.3 0.7  
Originations      
Segment Reporting Information [Line Items]      
Depreciation expense 0.4 0.2 0.1
Corporate Items and Other      
Segment Reporting Information [Line Items]      
Depreciation expense 9.2 9.3 18.1
Amortization of debt discount and issuance costs $ 9.3 $ 7.1 $ 6.5