Loans Held for Sale - Summary of Activity in Gain on Loans Held for Sale, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Change in fair value of loans held for sale (2)	$ (0.1)	$ (14.7)	$ 15.9
Gain On Sale Of Loans Including Value Assigned To MSRs Retained	151.4	31.4	17.3
Gain (loss) on economic hedge instruments	(71.9)	36.0	18.6
Change in fair value of IRLCs	17.2	(5.8)	6.4
Provision for representation and warranty obligations	(3.8)	(2.6)	(1.7)
Gain on loans held for sale, net	93.0	59.0	40.6
Change In Fair Value Of Mortgage Loans Held For Sale, Revaluation Gain (Loss)			10.9
MSRs Retained on Transfers of Forward Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt and Equity Securities, Gain (Loss)	385.7	247.6	183.0
Forward Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt and Equity Securities, Gain (Loss)	(233.0)	(200.0)	(178.8)
Repurchased Ginnie Mae Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt and Equity Securities, Gain (Loss)	$ (1.1)	$ (1.4)	$ (2.7)