Loans Held for Sale - Schedule of Loans Held for Sale Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	$ 617.8	$ 917.5
Originations and purchases	2,552.4	3,472.6
Proceeds from sales	(2,296.1)	(3,570.9)
Principal collections	(15.4)	(29.5)
Loans held for investment, at fair value	1.6	3.1
Receivables, net	1.1	(0.7)
REO (Other assets)	(4.2)	0.0
Realized loss on sale of loans	(22.0)	(72.3)
Capitalization of advances on Ginnie Mae modifications	2.0	7.3
Fair value gain (loss) on loans held for sale	6.2	(12.3)
Other	1.7	1.0
Ending balance	845.2	716.0
Principal amount outstanding on loans held for sale	845.6	736.6
Premium (discount) balance on loans held for sale	6.7	(3.9)
Fair value adjustment to loans held for sale	(7.1)	(16.7)
Mortgages Held-for-sale, Fair Value Disclosure	845.2	716.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	845.2	716.0
Repurchased Ginnie Mae Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Ending balance	23.3	230.4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 23.3	$ 230.4

Capitalization of advances on Ginnie Mae modifications.

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Fair value adjustment to loans held for sale

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Represents amount of addition or reductions in principal on mortgage loans held for sale other than foreclosures, costs of mortgages sold, and amortization of premium during the reporting period.

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Premium (discount) balance on loans held for sale

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Principal amount outstanding on loans held for sale

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Value of loans held for sale at fair value in the entity's portfolio transferred to real estate owned in non-cash transactions.

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Value of loans held for sale at fair value in the entity's portfolio transferred to receivables in non-cash transactions.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The increase (decrease) during the reporting period in the value of loans or securitized loans that are held with the intention to sell in the near future.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of mortgage loans held-for-sale.

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The amount of cash paid for the origination of mortgages that are held for sale.

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Cash inflow related to a loan origination (the process when securing a mortgage for a piece of real property), lease origination, and principal collections.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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