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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Advances, net	$ 550.6	$ 678.8
Mortgage servicing rights (MSRs), at fair value	2,327.7	2,272.2
Cash and cash equivalents	203.1	201.6
Total assets	13,084.7	$ 12,513.7
Second Lien
Debt Instrument [Line Items]
Advances, net	153.0
Specified deferred servicing fee	5.4
Mortgage servicing rights (MSRs), at fair value	674.5
Cash and cash equivalents	127.3
Specified advance facility reserves	10.6
Specified loan value	78.0
Specified residual value	0.0
Total assets	$ 1,048.7

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