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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Advances, net	$ 522.7	$ 678.8
Mortgage servicing rights (MSRs), at fair value	2,223.6	2,272.2
Cash and cash equivalents	201.6	201.6
Total assets	13,226.7	$ 12,513.7
Second Lien
Debt Instrument [Line Items]
Advances, net	156.4
Specified deferred servicing fee	6.1
Mortgage servicing rights (MSRs), at fair value	720.3
Cash and cash equivalents	124.3
Specified advance facility reserves	11.3
Specified loan value	26.8
Specified residual value	0.0
Total assets	$ 1,045.1

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