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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Fair Value - Schedule of Fair Value Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans held for sale
Loans held for sale, at fair value	$ 944.7	$ 1,352.9	$ 617.8	$ 725.2	$ 683.1	$ 917.5
Total Loans held for sale	944.7			725.2
Financial liabilities
Advance match funded liabilities	403.0		513.7
Financing liabilities, at fair value
HMBS-related borrowings	7,613.6	7,486.4	7,326.8	7,208.4	7,155.3	6,885.0
Other financing liabilities, at fair value	1,380.3		1,137.4
Other secured borrowings:
Mortgage loan financing facilities, net ($166.4 and $0.0 related to VIEs)	1,034.7		702.7
MSR financing facilities	901.7		953.8
Senior notes:
Total Senior notes	594.1		599.6
Derivative financial instrument assets (liabilities), net
Derivative liabilities	24.3		15.7
Mortgage servicing rights
MSRs	2,859.8	2,675.7	2,665.2	2,714.2	2,485.7	2,250.1
Carrying Value
Loans held for sale
Total Loans held for sale	948.3		622.7
Loans held for investment, at fair value	7,783.5		7,510.8
Financing liabilities, at fair value
Other financing liabilities, at fair value	1,380.3		1,137.4
Senior notes:
Total Senior notes	594.1		599.6
Fair Value
Loans held for sale
Total Loans held for sale	948.3		622.7
Loans held for investment, at fair value	7,783.5		7,510.8
Financing liabilities, at fair value
Other financing liabilities, at fair value	1,380.3		1,137.4
Senior notes:
Total Senior notes	552.1		555.2
ESS Financing Liability
Financing liabilities, at fair value
Other financing liabilities, at fair value	255.4		199.0
Level 3 \| Carrying Value
Loans held for sale
Loans held for sale, at fair value	944.7		617.8
Loans held for sale, at lower of cost or fair value	3.6		4.9
Loans held for investment, at fair value	7,777.6		7,504.1
Advances, net	564.6		718.9
Receivables, net	164.7		180.8
Financial liabilities
Advance match funded liabilities	403.0		513.7
Financing liabilities, at fair value
HMBS-related borrowings	7,613.6		7,326.8
Other secured borrowings:
Mortgage loan financing facilities, net ($166.4 and $0.0 related to VIEs)	1,034.7		702.7
MSR financing facilities	901.7		953.8
Mortgage servicing rights
MSRs	2,859.8		2,665.2
Level 3 \| Carrying Value \| Second Lien
Senior notes:
Senior secured notes	237.2		230.2
Level 3 \| Fair Value
Loans held for sale
Loans held for sale, at fair value	944.7		617.8
Loans held for sale, at lower of cost or fair value	3.6		4.9
Loans held for investment, at fair value	7,777.6		7,504.1
Advances, net	564.6		718.9
Receivables, net	164.7		180.8
Financial liabilities
Advance match funded liabilities	403.0		513.7
Financing liabilities, at fair value
HMBS-related borrowings	7,613.6		7,326.8
Other secured borrowings:
Mortgage loan financing facilities, net ($166.4 and $0.0 related to VIEs)	1,038.5		702.7
MSR financing facilities	884.0		932.1
Mortgage servicing rights
MSRs	2,859.8		2,665.2
Level 3 \| Fair Value \| Second Lien
Senior notes:
Senior secured notes	227.9		223.9
Level 3 \| Interest Rate Contract \| Carrying Value
Derivative financial instrument assets (liabilities), net
Interest rate lock commitments	(1.1)		(0.7)
Level 3 \| Interest Rate Contract \| Fair Value
Derivative financial instrument assets (liabilities), net
Interest rate lock commitments	(1.1)		(0.7)
Level 3 \| Other \| Carrying Value
Derivative financial instrument assets (liabilities), net
Other (a)	(0.2)		(0.1)
Level 3 \| Other \| Fair Value
Derivative financial instrument assets (liabilities), net
Other (a)	(0.2)		(0.1)
Level 3 \| ESS Financing Liability \| Carrying Value
Financing liabilities, at fair value
Other financing liabilities, at fair value	1,119.1		931.7
Level 3 \| ESS Financing Liability \| Fair Value
Financing liabilities, at fair value
Other financing liabilities, at fair value	1,119.1		931.7
Level 3 \| ESS Financing Liability
Mortgage servicing rights
Loans related to Ginnie Mae guaranteed securitizations	(255.4)			(36.3)
Level 3 \| ESS Financing Liability \| Carrying Value
Financing liabilities, at fair value
Other financing liabilities, at fair value	255.4		199.0
Level 3 \| ESS Financing Liability \| Fair Value
Financing liabilities, at fair value
Other financing liabilities, at fair value	255.4		199.0
Level 3 \| Financing Liability - Owed to Securitization Investors
Mortgage servicing rights
Loans related to Ginnie Mae guaranteed securitizations	(5.9)	(6.0)	(6.7)	(6.8)	(7.3)	(7.9)
Level 3 \| Financing Liability - Owed to Securitization Investors \| Carrying Value
Financing liabilities, at fair value
Other financing liabilities, at fair value	5.9		6.7
Level 3 \| Financing Liability - Owed to Securitization Investors \| Fair Value
Financing liabilities, at fair value
Other financing liabilities, at fair value	5.9		6.7
Level 3 \| Loans Held for Sale - Fair Value
Mortgage servicing rights
Loans related to Ginnie Mae guaranteed securitizations	199.8	$ 197.4	32.1	$ 30.5	$ 41.4	$ 220.9
Level 3 \| Loans Held for Sale - Fair Value \| Ginnie Mae Loans
Mortgage servicing rights
Loans related to Ginnie Mae guaranteed securitizations	199.8
Level 3 \| Loans Held for Investment Securitization Trusts \| Carrying Value
Loans held for sale
Loans held for investment, at fair value	5.9		6.7
Level 3 \| Loans Held for Investment Securitization Trusts \| Fair Value
Loans held for sale
Loans held for investment, at fair value	5.9		6.7
Level 2 \| Carrying Value
Loans held for sale
Loans held for sale, at fair value	944.7		617.8
Senior notes:
Senior secured notes	356.8		369.4
Level 2 \| Fair Value
Loans held for sale
Loans held for sale, at fair value	944.7		617.8
Senior notes:
Senior secured notes	324.2		331.4
Level 2 \| Forward LHFS Trades \| Carrying Value
Derivative financial instrument assets (liabilities), net
Derivative asset	1.3		0.5
Level 2 \| Forward LHFS Trades \| Fair Value
Derivative financial instrument assets (liabilities), net
Derivative asset	1.3		0.5
Level 2 \| Option Contracts \| Carrying Value
Derivative financial instrument assets (liabilities), net
Derivative liabilities	(1.4)		0.0
Level 2 \| Option Contracts \| Fair Value
Derivative financial instrument assets (liabilities), net
Derivative liabilities	(1.4)		0.0
Level 1 \| TBA forward MBS trades \| Carrying Value
Derivative financial instrument assets (liabilities), net
Derivative liabilities	9.6		0.7
Level 1 \| TBA forward MBS trades \| Fair Value
Derivative financial instrument assets (liabilities), net
Derivative liabilities	9.6		0.7
Level 1 \| Interest Rate Swap \| Carrying Value
Derivative financial instrument assets (liabilities), net
Derivative asset	(10.2)		(13.6)
Level 1 \| Interest Rate Swap \| Fair Value
Derivative financial instrument assets (liabilities), net
Derivative asset	(10.2)		(13.6)
Level 1 \| TBA Forward Pipelines Trades \| Carrying Value
Derivative financial instrument assets (liabilities), net
Derivative asset	10.6		6.6
Level 1 \| TBA Forward Pipelines Trades \| Fair Value
Derivative financial instrument assets (liabilities), net
Derivative asset	$ 10.6		$ 6.6