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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt securities:        
Interest expense $ 74.3 $ 50.4 $ 204.8 $ 126.1
Amortization of debt issuance costs and discount 5.9 2.4 12.0 7.5
OFC Senior Secured Notes        
Debt securities:        
Interest expense 11.0 10.6 32.6 31.5
Amortization of debt issuance costs and discount 2.4 2.0 7.1 5.9
Senior Notes        
Debt securities:        
Interest expense 7.8 7.7 23.3 24.0
MSR financing facilities        
Debt securities:        
Interest expense 16.6 13.8 51.9 30.2
Mortgage loan financing facilities        
Debt securities:        
Interest expense 26.0 10.8 59.4 24.6
Advance match funded liabilities        
Debt securities:        
Interest expense 9.9 5.0 31.0 10.5
Escrow        
Debt securities:        
Interest expense $ 3.1 $ 2.4 $ 6.6 $ 5.4