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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Amortization of debt issuance costs and discount	$ 19.4	$ 26.7
Amortization of intangibles	0.7	$ 2.3
Total Assets	16,107.4		$ 16,435.4
Servicing | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	14,506.3		15,242.5
Originations | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	1,384.7		945.0
Corporate Segment and Other Operating Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	$ 216.4		$ 247.9

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- Definition

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

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