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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Amortization of intangibles	$ 2.3	$ 4.2
Total Assets	13,226.7		$ 12,513.7
Servicing | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	12,110.2		11,687.6
Originations | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	856.6		551.9
Corporate and Other [Member] | Operating Segments
Segment Reporting Information [Line Items]
Total Assets	$ 259.9		$ 274.3

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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