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Borrowings - Schedule of Mortgage Loan Warehouse Facilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Jun. 15, 2023
Apr. 03, 2023
Dec. 31, 2022
Secured Debt        
Line of Credit Facility [Line Items]        
Unamortized debt issuance costs $ (21.0)      
Secured Debt        
Line of Credit Facility [Line Items]        
Senior notes 916.2     $ 953.8
Unamortized debt issuance costs (0.4)     (0.8)
Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 125.0      
Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 350.0      
Secured Debt | Participation Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 316.1      
Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Secured Debt | Mortgage Warehouse Agreement Two        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Secured Debt | Mortgage Warehouse Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 132.9      
Available borrowing capacity 0.0      
Secured Debt | Mortgage Warehouse Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 217.8      
Available borrowing capacity 0.0      
Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Available borrowing capacity 0.0      
Secured Debt | Loan and Security Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Available borrowing capacity 50.0      
Secured Debt | Master Repurchase Agreement- Flagstar        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 250.0      
Available borrowing capacity 81.6      
Secured Debt | $200 million April 2024 Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 200.0   $ 200.0  
Available borrowing capacity 0.0      
Long-term debt, gross 0.0     0.0
Secured Debt | OLIT 2023 Notes        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Long-term debt, gross 164.4 $ 264.9    
Secured Debt | OLIT Notes FY 2022        
Line of Credit Facility [Line Items]        
Long-term debt, gross       0.0
Secured Debt | September 2024 Loan and Security Agreement        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 0.0      
Available borrowing capacity 30.0      
Long-term debt, gross $ 0.0     $ 0.0
Mortgage Loan Warehouse Facilities        
Line of Credit Facility [Line Items]        
Weighted average interest rate (percentage) 6.15%     5.74%
Unamortized debt issuance costs $ (1.0)     $ (0.5)
Mortgage Loan Warehouse Facilities | Secured Debt        
Line of Credit Facility [Line Items]        
Uncommitted available borrowing capacity 1,591.7      
Available borrowing capacity 372.7      
Long-term debt, gross 731.6     702.7
Senior notes 710.6     702.7
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Available borrowing capacity 34.3      
Long-term debt, gross 15.7     142.2
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Available borrowing capacity 0.0      
Long-term debt, gross 0.0     100.3
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Available borrowing capacity 0.0      
Long-term debt, gross 0.0     0.0
Mortgage Loan Warehouse Facilities | Secured Debt | Participation Agreement        
Line of Credit Facility [Line Items]        
Available borrowing capacity 0.0      
Long-term debt, gross 83.9     64.3
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Available borrowing capacity 135.8      
Long-term debt, gross 64.2     26.1
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Available borrowing capacity 1.0      
Long-term debt, gross 0.0     0.0
Mortgage Loan Warehouse Facilities | Secured Debt | Mortgage Warehouse Agreement Two        
Line of Credit Facility [Line Items]        
Available borrowing capacity 40.0      
Long-term debt, gross 0.0     7.8
Mortgage Loan Warehouse Facilities | Secured Debt | Mortgage Warehouse Agreement        
Line of Credit Facility [Line Items]        
Long-term debt, gross 71.1     44.2
Mortgage Loan Warehouse Facilities | Secured Debt | Mortgage Warehouse Agreement        
Line of Credit Facility [Line Items]        
Long-term debt, gross 12.2     21.9
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement        
Line of Credit Facility [Line Items]        
Long-term debt, gross 151.7     0.0
Mortgage Loan Warehouse Facilities | Secured Debt | Loan and Security Agreement        
Line of Credit Facility [Line Items]        
Long-term debt, gross 0.0     7.2
Mortgage Loan Warehouse Facilities | Secured Debt | Master Repurchase Agreement- Flagstar        
Line of Credit Facility [Line Items]        
Long-term debt, gross $ 168.4     $ 288.8