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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 571.8   $ 725.1      
Allowance for losses (7.2) $ (7.4) (6.2) $ (6.2) $ (6.6) $ (7.0)
Advances, net 564.6   718.9      
Principal and interest            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 193.6   215.5      
Taxes and insurance            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 250.5   367.5      
Foreclosures, bankruptcy, REO and other            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 127.8   $ 142.1