Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Senior notes, net ($237.2 and $230.2 due to related party)	$ 594.1	$ 599.6
Senior Notes
Debt Instrument [Line Items]
Senior notes	646.1	660.0
Discount	(42.2)	(48.6)
Unamortized debt issuance costs	$ (9.8)	(11.8)
7.875% Senior Notes, Due 2026 \| Secured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	7.875%
Senior notes	$ 361.1	375.0
7.875% Senior Notes, Due 2026 \| Secured Debt \| Before March 15, 2024
Debt Instrument [Line Items]
Redemption price	103.938%
7.875% Senior Notes, Due 2026 \| Secured Debt \| Before March 15, 2025
Debt Instrument [Line Items]
Redemption price	101.969%
7.875% Senior Notes, Due 2026 \| Senior Notes
Debt Instrument [Line Items]
Discount	$ (1.0)	(1.3)
Unamortized debt issuance costs	$ (3.3)	(4.3)
12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027
Debt Instrument [Line Items]
Interest rate (as a percent)	12.00%
12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027 \| Secured Debt
Debt Instrument [Line Items]
Senior notes	$ 285.0	285.0
12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027 \| Payment in Kind (PIK) Note
Debt Instrument [Line Items]
Interest rate (as a percent)	13.25%
12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Discount	$ (41.2)	(47.3)
Unamortized debt issuance costs	$ (6.5)	$ (7.5)

Contractual interest rate for funds borrowed, under the debt agreement.

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