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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt securities:
Interest expense	$ 82.9	$ 74.2	$ 225.6	$ 214.6
Amortization of debt issuance costs and discount			19.4	26.7
OFC Senior Secured Notes
Debt securities:
Interest expense	0.0	11.5	0.0	34.1
Senior Notes
Debt securities:
Interest expense	0.0	6.4	0.0	20.3
MSR financing facilities
Debt securities:
Interest expense	23.0	18.6	63.1	56.1
Mortgage loan financing facilities
Debt securities:
Interest expense	37.0	25.7	94.9	69.3
Advance match funded liabilities
Debt securities:
Interest expense	7.8	9.1	23.4	28.8
Escrow
Debt securities:
Interest expense	2.3	2.8	5.6	6.0
Senior Notes Due 2029
Debt securities:
Interest expense	$ 12.9	$ 0.0	$ 38.6	$ 0.0

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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-Topic 470
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