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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Amortization of Debt Issuance Costs and Discounts	$ 5.7	$ 8.1
Amortization of intangibles	0.3	$ 0.9
Total Assets	16,259.3		$ 16,435.4
Servicing | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	15,013.1		15,242.5
Originations | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	1,009.6		945.0
Corporate Segment and Other Operating Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	$ 236.6		$ 247.9

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- Definition

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

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