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Reverse Mortgages - Schedule of Reverse Mortgage Revenue, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Receivables [Abstract]      
Gain on new originations $ 22.8 $ 20.5 $ 50.7
Net interest income (servicing fee) 26.2 23.6 21.9
Other change in fair value of securitized loans held for investment and HMBS-related borrowings, net (9.7) (0.1) (47.1)
Change in fair value included in earnings, net 39.4 44.0 25.6
Loan fees and other 3.1 2.8 10.5
Reverse mortgage revenue, net $ 42.5 $ 46.7 $ 36.1