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, 2025	Dec. 31, 2024	Dec. 31, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages, held-for-sale	$ 1,891.7	$ 1,290.2
Receivables, net ($64.2 and $31.9 related to VIEs)	189.8	176.4
Restricted cash	41.4	47.1	$ 21.2
Balance	16,170.6	16,435.4	$ 12,513.7
Mortgage warehouse facilities	1,224.6	1,046.3
Total liabilities	15,492.8	15,942.5
Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Receivables, net ($64.2 and $31.9 related to VIEs)	64.2	31.9
Variable Interest Entity, Primary Beneficiary | OLIT Securitization Notes
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages, held-for-sale	698.2	375.4
Receivables, net ($64.2 and $31.9 related to VIEs)	62.6	31.9
Real Estate Owned	81.0	39.4
Restricted cash	26.5	13.3
Balance	868.4	460.0
Mortgage warehouse facilities	951.9	517.3
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(52.6)	(35.4)
Accrued Liabilities and Other Liabilities	2.6	1.7
Total liabilities	$ 901.9	$ 483.6