Reverse Mortgages - Schedule of Reverse Mortgage Revenue, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Receivables [Abstract]
Gain on new originations	$ 4.4	$ 9.3	$ 13.9	$ 42.6
Other change in fair value of securitized loans held for investment and HMBS-related borrowings, net	(14.8)	(11.8)	(22.6)	(60.1)
Change in fair value included in earnings, net	(1.7)	5.7	17.8	8.1
Loan fees and other	1.3	1.2	3.7	9.3
Gain (loss) on reverse loans held for investment and HMBS-related borrowings, net	(0.4)	6.9	21.5	17.4
Gain on tail securitization	2.8	2.6	8.9	9.3
Net interest income (servicing fee)	$ 5.9	$ 5.5	$ 17.7	$ 16.3

Fee and Commissions, Reverse Mortgage Banking

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Gain on tail securitization - reverse mortgage

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Net interest income (servicing fee) - Reverse mortgages

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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.

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Amount of interest and fee income from loans classified as other.

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