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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt securities:      
Interest expense $ 186.0 $ 144.0 $ 109.4
Amortization of debt discount and issuance costs 10.1 7.8 7.0
Other Secured Borrowings      
Debt securities:      
Interest expense 42.1 31.7 0.0
Amortization of debt discount and issuance costs 7.9 5.0  
Senior Notes      
Debt securities:      
Interest expense 31.8 31.9 26.6
Mortgage Loan Warehouse Facilities      
Debt securities:      
Interest expense 37.8 30.6 15.2
MSR Financing Facilities      
Debt securities:      
Interest expense 47.0 26.0 15.9
Match Funded Liabilities      
Debt securities:      
Interest expense 19.8 14.2 24.1
SSTL      
Debt securities:      
Interest expense 0.0 3.0 20.5
Other      
Debt securities:      
Interest expense $ 7.5 $ 6.5 $ 7.0