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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt securities:        
Interest expense $ 68.3 $ 37.9 $ 130.5 $ 75.7
Amortization of debt issuance costs and discount 3.3 2.5 6.1 5.1
OFC Senior Secured Notes        
Debt securities:        
Interest expense 10.9 10.5 21.7 20.9
Amortization of debt issuance costs and discount 2.4 2.0 4.7 3.9
Senior Notes        
Debt securities:        
Interest expense 7.8 8.1 15.5 16.3
MSR financing facilities        
Debt securities:        
Interest expense 17.8 8.6 35.3 16.4
Mortgage loan financing facilities        
Debt securities:        
Interest expense 19.8 6.7 33.4 13.8
Advance match funded liabilities        
Debt securities:        
Interest expense 10.4 2.8 21.1 5.5
Escrow        
Debt securities:        
Interest expense $ 1.6 $ 1.2 $ 3.5 $ 2.9