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Loans Held for Sale - Fair Value - Schedule of Gains on Loans Held for Sale, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
MSRs retained on transfers of forward mortgage loans	$ 61.6	$ 71.4	$ 163.9	$ 134.0
Gain (loss) on sales of loans, net	61.4	(22.5)	81.7	(1.0)
Change in fair value of IRLCs	1.1	(2.7)	(0.4)	(0.2)
Change in fair value of loans held for sale	7.8	(4.1)	4.4	5.0
Gain (loss) on economic hedge instruments	(36.0)	34.1	(26.3)	38.9
Other	(0.8)	(0.7)	(1.7)	(1.3)
Gain on loans held for sale, net	25.8	8.2	53.2	36.3
MSR valuation adjustments, net	(31.5)	(16.4)	(75.8)	(134.2)
Gain (loss) on Sale of Forward Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain (loss) on sales of loans, net	(7.9)	(89.4)	(85.7)	(139.6)
Repurchased Ginnie Mae Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain (loss) on sales of loans, net	$ 0.0	$ (0.5)	$ (1.0)	$ (0.5)

X

- Definition

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

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No definition available.

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Represents the net increase or decrease in the fair value of the interest rate derivative or group of derivatives.

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- Definition

The amount of mortgage servicing rights (MSRs) retained in connection with transfer of securitized loans accounted for as sales.

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No definition available.

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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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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
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-Name Accounting Standards Codification
-Section S99
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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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Amount of increase (decrease) in fair value from changes in the inputs used to calculate the fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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