Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Principal amount outstanding on loans held for sale	$ 1,401.2	$ 678.8
Premium (discount) balance on loans held for sale	(91.6)	(2.4)
Fair value adjustment to loans held for sale	(19.4)	(2.2)
Mortgages Held-for-sale, Fair Value Disclosure	1,290.2	674.2
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	674.2	617.8	$ 917.5
Originations and purchases	17,811.4	12,797.5	17,582.0
Proceeds from sales	(16,857.8)	(12,450.8)	(17,477.2)
Principal collections	(102.1)	(87.5)	(106.9)
Transfer from loans held for investment to loans held for sale	4.8	6.1	8.0
Transfer of Portfolio Loans and Leases to Held-for-sale		6.1	8.0
Transfer Of Portfolio Loans To Receivables	(32.9)	(33.2)	(13.2)
Real estate owned (Other assets)	(26.8)	(19.4)	(3.1)
Transfer Of Portfolio Loans To Real Estate Owned	(26.8)	(19.4)	(3.1)
Transfer To Receivables	(32.9)	(33.2)	(13.2)
Capitalization of advances on Ginnie Mae modifications	9.3	6.4	18.1
Fair value gain (loss) on loans held for sale	(216.2)	(165.7)	(294.0)
Other	26.1	2.8	(13.4)
Ending balance	1,290.2	674.2	617.8
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	1,290.2	674.2
Loans Held-for-sale, Fair Value Disclosure	1,290.2	674.2	617.8
Transfer Of Portfolio Loans To Real Estate Owned	26.8	19.4	3.1
Transfer Of Portfolio Loans To Receivables	(32.9)	(33.2)	$ (13.2)
Variable Interest Entity, Primary Beneficiary \| Warehouse Mortgage Loan Financing Facility
Receivables [Abstract]
Mortgages Held-for-sale, Fair Value Disclosure	375.4	119.5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	375.4	119.5
GSE Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	219.3
Ending balance	610.8	219.3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	610.8	219.3
Government Forward Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	254.0
Ending balance	215.5	254.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	215.5	254.0
Repurchased Ginnie Mae Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	19.1
Ending balance	26.1	19.1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	26.1	19.1
Reverse Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	166.6
Ending balance	432.4	166.6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	432.4	166.6
Residential Mortgage Backed Securities
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	15.2
Ending balance	5.3	15.2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 5.3	$ 15.2

Capitalization of advances on Ginnie Mae modifications.

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Fair value adjustment to loans held for sale

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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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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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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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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 investments transferred from the entity's investments in noncash transactions.

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