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Borrowings - Schedule of Mortgage Loan Warehouse Facilities (Footnote) (Details) - USD ($) $ in Millions		1 Months Ended
	Jun. 30, 2023	Jul. 31, 2023	Dec. 31, 2023	Sep. 30, 2023	Aug. 31, 2023	Jun. 15, 2023	Mar. 31, 2023	Feb. 28, 2023	Dec. 31, 2022
Secured Debt
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ (0.4)						$ (0.8)
Master Repurchase Agreement | Secured Debt
Debt Instrument [Line Items]
Uncommitted available borrowing capacity			0.0
Participation Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 400.0	$ 650.0
Participation Agreement | Secured Debt
Debt Instrument [Line Items]
Uncommitted available borrowing capacity			316.1
Master Repurchase Agreement- Flagstar
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500.0					$ 700.0
Line of Credit Facility Committed Amount						$ 250.0
Master Repurchase Agreement- Flagstar | Secured Debt
Debt Instrument [Line Items]
Available borrowing capacity			81.6
Uncommitted available borrowing capacity			250.0
Mortgage Loan Warehouse Facilities
Debt Instrument [Line Items]
Available borrowing capacity			39.2
January 2024 Mortgage Warehouse Agreement | Secured Debt
Debt Instrument [Line Items]
Line Of Credit Facility, Capacity Available For Specific Purpose Other Than For Trade Purchases, Increased (Decreased) Balance	$ 50.0	$ 40.0
Master Repurchase Agreement | Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 350.0	$ 50.0
Uncommitted available borrowing capacity			350.0
OLIT 2023 Notes | Secured Debt
Debt Instrument [Line Items]
Uncommitted available borrowing capacity			0.0
Debt instrument stated percentage of interest (percentage)	3.00%
Mortgage Loan Warehouse Facilities
Debt Instrument [Line Items]
Unamortized debt issuance costs			(1.0)						$ (0.5)
Mortgage Loan Warehouse Facilities | Secured Debt
Debt Instrument [Line Items]
Available borrowing capacity			372.7
Uncommitted available borrowing capacity			1,591.7
Mortgage Loan Warehouse Facilities | Master Repurchase Agreement | Secured Debt
Debt Instrument [Line Items]
Available borrowing capacity			0.0
Mortgage Loan Warehouse Facilities | Participation Agreement | Secured Debt
Debt Instrument [Line Items]
Available borrowing capacity			0.0
Mortgage Loan Warehouse Facilities | Master Repurchase Agreement | Secured Debt
Debt Instrument [Line Items]
Available borrowing capacity			$ 0.0

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