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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Sep. 24, 2025	May 31, 2025	Feb. 28, 2025
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Average period to securitization					30 days
MSRs retained		$ 116.0	$ 61.6		$ 258.9	$ 163.9
Percentage of loan transferred through securitization 60 days or more past due					2.00%		2.70%
Threshold period past due	60 days	60 days		60 days	60 days		60 days
Maximum borrowing capacity									$ 350.0
Percentage Of The Limited Liability Company Interest	100.00%	100.00%		100.00%	100.00%					100.00%
Total Assets	$ 16,107.4	$ 16,107.4		$ 16,107.4	$ 16,107.4		$ 16,435.4
Mortgage Warehouse Agreement \| Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	200.0	200.0		200.0	200.0		200.0
Warehouse Mortgage Loan Financing Facility \| Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	478.6	478.6		478.6	478.6		375.4
Loans held for sale pledged as a collateral	200.0	200.0		200.0	200.0		200.0
Total Assets	597.7	597.7		597.7	597.7		$ 460.0
Master Repurchase Agreement Three \| Secured Debt
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Uncommitted available borrowing capacity	350.0	350.0		350.0	350.0
Proceeds from Lines of Credit				270.6
Master Repurchase Agreement Three \| Secured Debt \| Asset Pledged as Collateral with Right
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total Assets	297.5	297.5		297.5	297.5
$205.0 Warehouse Mortgage Loan Facility \| Secured Debt
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Uncommitted available borrowing capacity	205.0	205.0		205.0	205.0
Proceeds from Lines of Credit	144.9
Membership Interest Received In Exchange For Contributed Participation Interest								100.00%
$205.0 Warehouse Mortgage Loan Facility \| Secured Debt \| Asset Pledged as Collateral with Right
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total Assets	$ 149.6	$ 149.6		$ 149.6	$ 149.6
Ginnie Mae Loans
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Percentage of loan transferred through securitization 60 days or more past due					4.80%		7.00%
Threshold period past due	60 days	60 days		60 days	60 days		60 days