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Fair Value - Summary of Reconciliation of the Changes in Fair Value of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total realized and unrealized gains and (losses):
Gain (loss) on derivatives, net	$ (23.5)	$ (13.3)	$ 35.3
FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleListNotDisclosedFlag	Change in fair value included in earnings (1)
Interest Rate Lock Commitments [Member]
Total realized and unrealized gains and (losses):
Gain (loss) on derivatives, net	$ (18.8)	(4.6)	17.8
Loans Held for Investments - Restricted for Securitization Investors | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	7.9	9.8	23.3
Purchases, issuances, sales and settlements
Deconsolidation of mortgage-backed securitization trusts			(10.7)
Settlements	(1.2)	(1.9)	(2.9)
Purchases, issuances, sales and settlements, total	(1.2)	(1.9)	(13.6)
Total realized and unrealized gains and (losses):
Ending balance	6.7	7.9	9.8
Financing Liability Owed to Securitization Investors | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(7.9)	(9.8)	(22.0)
Purchases, issuances, sales and settlements
Deconsolidation of mortgage-backed securitization trusts			9.5
Settlements	1.2	1.9	2.9
Purchases, issuances, sales and settlements, total	1.2	1.9	12.4
Total realized and unrealized gains and (losses):
Included in earnings		0.0
Ending balance	(6.7)	(7.9)	(9.8)
Loans Held-For-Sale, Fair Value | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	220.9	51.1	0.0
Purchases, issuances, sales and settlements
Purchases	140.4	436.2	162.6
Sales	(318.0)	(260.0)	(137.8)
Receivables, net	(4.2)	(1.6)	(1.0)
Other assets	(0.3)	(0.4)
Purchases, issuances, sales and settlements, total	(182.1)	174.1	23.8
Total realized and unrealized gains and (losses):
Included in earnings	(6.8)	4.3	(1.7)
Transfers in and / or out of Level 3			25.6
Ending balance	32.1	220.9	51.1
ESS Financing Liability | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0.0
Purchases, issuances, sales and settlements
Purchases	0.0
Issuances	(200.9)
Sales	0.0
Settlements	6.6
Loans held for sale, at fair value (1)	0.0
Receivables, net	0.0
Purchases, issuances, sales and settlements, total	(200.4)
Total realized and unrealized gains and (losses):
Included in earnings	(1.4)
Ending balance	(199.0)	0.0
Other assets and liabilities	(6.1)
Mortgage Backed Securities | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0.0	2.0	2.1
Purchases, issuances, sales and settlements
Sales		(1.6)
Loans held for sale, at fair value (1)			0.0
Purchases, issuances, sales and settlements, total		(1.6)	0.0
Total realized and unrealized gains and (losses):
Included in earnings		(0.4)	0.1
Ending balance		0.0	2.0
Other assets and liabilities		0.0
IRLCs | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	18.1
Purchases, issuances, sales and settlements
Issuances	168.0	627.7	287.0
Loans held for sale, at fair value (1)	(141.5)	(591.7)	(285.2)
Purchases, issuances, sales and settlements, total	26.5	36.0
Total realized and unrealized gains and (losses):
Included in earnings	(45.3)
Ending balance	$ (0.7)	18.1
Other assets and liabilities		0.0
Interest Rate Caps | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		22.7	0.0
Purchases, issuances, sales and settlements
Purchases, issuances, sales and settlements, total			1.8
Total realized and unrealized gains and (losses):
Included in earnings		$ (40.6)	(10.4)
Transfers in and / or out of Level 3			10.5
Ending balance			$ 22.7

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