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Securitizations and Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities of Loans Held for Sale Financing Facility (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 1,290.2	$ 674.2
Receivables, net ($31.9 and $19.9 related to VIEs)	176.4	154.8
Restricted cash	47.1	21.2	$ 43.9
Balance	16,435.4	12,513.7	$ 12,399.2
Mortgage loan financing facilities ($481.9 and $143.4 related to VIEs)	1,528.2	710.6
Total liabilities	15,942.5	12,111.9
Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Receivables, net ($31.9 and $19.9 related to VIEs)	31.9	19.9
Mortgage loan financing facilities ($481.9 and $143.4 related to VIEs)	481.9	143.4
Variable Interest Entity, Primary Beneficiary | Warehouse Mortgage Loan Financing Facility
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	375.4	119.5
Receivables, net ($31.9 and $19.9 related to VIEs)	31.9	19.9
Real Estate Owned	39.4	12.5
Restricted cash	13.3	6.8
Balance	460.0	158.6
Mortgage loan financing facilities ($481.9 and $143.4 related to VIEs)	517.3	164.4
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(35.4)	(21.0)
Accrued Liabilities and Other Liabilities	1.7	0.5
Total liabilities	$ 483.6	$ 143.8

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