Reverse Mortgages - Narrative (Details) loan in Thousands, $ in Millions				3 Months Ended	9 Months Ended
	Sep. 30, 2026 USD ($)	Jun. 30, 2026 USD ($) loan	Apr. 30, 2026 loan	Sep. 30, 2026 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held For Sale, Reverse Mortgages, Unpaid Principal							$ 9,333.0
HMBS-related borrowings, at fair value	$ (3,335.1)	$ (3,610.9)		$ (3,335.1)	$ (3,335.1)	$ (9,924.6)	(9,611.7)	$ (10,253.1)	$ (10,872.1)
Reverse loans held for sale pooled into Home Equity Conversion Mortgage-Backed Securities (HMBS), at fair value	0.0	$ 0.0		0.0	0.0		9,807.5
HMBS-related borrowings, at fair value				0.0	(5,503.1)	$ 0.0
Finance of America Reverse LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Reverse Mortgage Servicing Rights Sold, Number Of Loans \| loan		20	20
Percentage Of Reverse Mortgage Servicing Rights Sold			58.00%
Securitized Assets Sold	5,600.0			5,600.0	5,600.0
Loans Held For Sale, Reverse Mortgages, Unpaid Principal	5,200.0			5,200.0	5,200.0
Reverse MSR, Net	70.0			70.0	70.0
HMBS-related borrowings, at fair value	5,500.0
HECM Loans - Securitized, Pledged To HMBS-Related Borrowings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reverse loans held for sale pooled into Home Equity Conversion Mortgage-Backed Securities (HMBS), at fair value							9,703.1
New HECM Loan Originations And HECM Loan Tails - Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reverse loans held for sale pooled into Home Equity Conversion Mortgage-Backed Securities (HMBS), at fair value							$ 104.4
New HECM Loan Originations And HECM Loan Tails - Unsecuritized \| Finance of America Reverse LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held For Sale Reverse Mortgages Sold	$ 57.0			$ 57.0	$ 57.0