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Fair Value - Schedule of Reconciliation of Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Purchases, issuances, sales and settlements
Advances (capitalization upon Ginnie Mae modifications)	$ 2.1	$ 2.0
Total realized and unrealized gains and (losses):
Gains (losses) on derivatives	(49.3)	3.5
Forward loans IRLCs
Total realized and unrealized gains and (losses):
Gains (losses) on derivatives	(0.6)	5.6
Level 3 | Loans Held for Sale - Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	203.1	32.1
Purchases, issuances, sales and settlements
Purchases and other	145.1	12.4
Sales	(38.0)	(20.2)
Settlements (2)	(22.1)
Loans held for investment, at fair value	1.0
Receivables, net	(10.6)	(0.4)
Advances (capitalization upon Ginnie Mae modifications)	(2.1)
Purchases, issuances, sales and settlements, total	74.5	(8.2)
Total realized and unrealized gains and (losses):
Change in fair value included in earnings	6.4	(0.5)
Ending balance	284.0	23.3
REO (Other assets)	(3.0)
Level 3 | ESS Financing Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(248.9)	(199.0)
Purchases, issuances, sales and settlements
Issuances		68.7
Settlements (2)	7.4	6.8
Purchases, issuances, sales and settlements, total	7.4	(62.0)
Total realized and unrealized gains and (losses):
Change in fair value included in earnings	(11.9)	(2.1)
Ending balance	(253.4)	(263.1)
Level 3 | IRLCs
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	5.6	(0.7)
Purchases, issuances, sales and settlements
Issuances	17.2	5.8
Loans held for sale, at fair value	(5.8)	(20.4)
Purchases, issuances, sales and settlements, total	11.4	(14.6)
Total realized and unrealized gains and (losses):
Change in fair value included in earnings	(12.0)	20.1
Ending balance	$ 5.0	$ 4.8

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