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Borrowings - Schedule of Mortgage Loan Warehouse Facilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity $ 32.8  
Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 250.0  
Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 50.0  
Other Secured Borrowings | Participation Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 185.7  
Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 0.0  
Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 0.0  
Other Secured Borrowings | Mortgage Warehouse Agreement Two    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 0.0  
Other Secured Borrowings | Mortgage Warehouse Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 159.8  
Available borrowing capacity 0.0  
Other Secured Borrowings | Mortgage Warehouse Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 208.1  
Available borrowing capacity 0.0  
Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 0.0  
Available borrowing capacity 0.0  
Long-term debt, gross 0.0 $ 459.3
Other Secured Borrowings | Loan and Security Agreement    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 0.0  
Available borrowing capacity 42.8  
Other Secured Borrowings | Master Repurchase Agreement- Flagstar    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity 211.2  
Available borrowing capacity $ 0.0  
Mortgage Loan Warehouse Facilities    
Line of Credit Facility [Line Items]    
Weighted average interest rate (percentage) 5.74% 2.61%
Mortgage Loan Warehouse Facilities | Other Secured Borrowings    
Line of Credit Facility [Line Items]    
Uncommitted available borrowing capacity $ 1,097.6  
Available borrowing capacity 332.6  
Long-term debt, gross 702.7 $ 1,085.1
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Available borrowing capacity 0.0  
Long-term debt, gross 142.2 109.4
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Available borrowing capacity 99.7  
Long-term debt, gross 100.3 160.9
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | 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 | Other Secured Borrowings | Participation Agreement    
Line of Credit Facility [Line Items]    
Available borrowing capacity 0.0  
Long-term debt, gross 64.3 45.2
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Available borrowing capacity 146.9  
Long-term debt, gross 26.1 1.8
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | 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 | Other Secured Borrowings | Mortgage Warehouse Agreement Two    
Line of Credit Facility [Line Items]    
Available borrowing capacity 42.2  
Long-term debt, gross 7.8 11.8
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Mortgage Warehouse Agreement    
Line of Credit Facility [Line Items]    
Long-term debt, gross 44.2 87.8
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Mortgage Warehouse Agreement    
Line of Credit Facility [Line Items]    
Long-term debt, gross 21.9 192.0
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Master Repurchase Agreement    
Line of Credit Facility [Line Items]    
Long-term debt, gross 0.0 459.3
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Loan and Security Agreement    
Line of Credit Facility [Line Items]    
Long-term debt, gross 7.2 16.8
Mortgage Loan Warehouse Facilities | Other Secured Borrowings | Master Repurchase Agreement- Flagstar    
Line of Credit Facility [Line Items]    
Long-term debt, gross $ 288.8 $ 0.0