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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Debt securities:    
Interest expense $ 62.3 $ 37.9
Amortization of debt issuance costs and discount 2.8 2.5
OFC Senior Secured Notes    
Debt securities:    
Interest expense 10.8 10.4
Amortization of debt issuance costs and discount 2.3 2.0
Senior Notes    
Debt securities:    
Interest expense 7.8 8.2
MSR financing facilities    
Debt securities:    
Interest expense 17.5 7.8
Mortgage loan warehouse facilities    
Debt securities:    
Interest expense 13.6 7.1
Advance match funded liabilities    
Debt securities:    
Interest expense 10.7 2.7
Escrow    
Debt securities:    
Interest expense $ 1.9 $ 1.7