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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Amortization of Debt Issuance Costs and Discounts	$ 11.6	$ 17.9
Amortization of intangibles	0.5	$ 1.7
Total Assets	16,531.3		$ 16,435.4
Servicing | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	14,685.7		15,242.5
Originations | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	1,615.1		945.0
Corporate Segment and Other Operating Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	$ 230.5		$ 247.9

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- Definition

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

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