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Reverse Mortgages - Schedule of Reverse Mortgage Revenue, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Receivables [Abstract]      
Gain on new originations $ 20.5 $ 50.7 $ 65.0
Other change in fair value of securitized loans held for investment and HMBS-related borrowings, net (3) (0.1) (47.1) (22.2)
Net interest income (servicing fee) 23.6 21.9 19.9
Change in fair value included in earnings, net 44.0 25.6 62.7
Loan fees and other 2.8 10.5 17.0
Reverse mortgage revenue, net $ 46.7 $ 36.1 $ 79.7