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Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Mar. 04, 2021
7.875% Senior Notes, Due 2026
Debt Instrument [Line Items]
Debt instrument stated percentage of interest (percentage)			7.875%
12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027
Debt Instrument [Line Items]
Debt instrument stated percentage of interest (percentage)	12.00%
Other Secured Borrowings \| 7.875% Senior Notes, Due 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 360.0	$ 375.0
Discount	(0.9)	(1.3)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(3.9)	(5.6)
Other Secured Borrowings \| 12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027
Debt Instrument [Line Items]
Long-term debt, gross	285.0	285.0
Discount	(39.1)	(47.3)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(45.3)	(54.8)
Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	645.0	660.0
Senior notes	595.8	599.6
Senior Notes \| 7.875% Senior Notes, Due 2026
Debt Instrument [Line Items]
Unamortized debt issuance costs	(3.0)	(4.3)
Senior Notes \| 12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (6.2)	$ (7.5)