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Loans Held for Sale - Fair Value - Schedule of Loans Held for Sale Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance	$ 1,025.7	$ 845.2	$ 674.2	$ 617.8
Originations and purchases	4,420.5	2,859.9	7,409.4	5,412.3
Proceeds from sales	(4,256.4)	(2,279.6)	(6,837.4)	(4,575.8)
Principal collections	(27.5)	(31.6)	(50.6)	(47.0)
Loans held for investment, at fair value	0.8	1.5	1.9	3.1
Receivables, net	(7.6)	(15.6)	(18.2)	(14.5)
REO (Other assets)	(4.3)	(7.1)	(7.3)	(11.2)
Advances (capitalization upon Ginnie Mae modifications)	2.8	1.7	4.9	3.7
Fair value gain (loss) on loans held for sale, at fair value (1)	(54.7)	(23.9)	(82.2)	(41.1)
Other	4.5	2.3	9.2	5.5
Ending balance	1,103.9	1,352.9	1,103.9	1,352.9
Principal amount outstanding on loans held for sale	1,139.8	678.8	1,139.8	678.8
Premium (discount) balance on loans held for sale	(28.7)	(2.4)	(28.7)	(2.4)
Fair value adjustment to loans held for sale	(7.2)	(2.2)	(7.2)	(2.2)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	1,103.9	$ 1,352.9	1,103.9	$ 1,352.9
GSE loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance			219.3
Ending balance	558.0		558.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	558.0		558.0
Government- Forward loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance			254.0
Ending balance	263.0		263.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	263.0		263.0
Repurchased Ginnie Mae Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance			19.1
Ending balance	23.9		23.9
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	23.9		23.9
Reverse Loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance			166.6
Ending balance	249.8		249.8
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	249.8		249.8
Other residential mortgage loans
Movement In Loans Held For Sale At Fair Value [Roll Forward]
Beginning balance			15.2
Ending balance	9.2		9.2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 9.2		$ 9.2

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