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Borrowings - Schedule of Senior Notes (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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      
Debt Instrument [Line Items]      
Discount $ (48.6) $ (55.9)  
Unamortized debt issuance costs (11.8) (14.3)  
Other Secured Borrowings | 7.875% Senior Notes, Due 2026      
Debt Instrument [Line Items]      
Long-term debt, gross 375.0 400.0  
Discount (1.3) (1.8)  
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 (47.3) (54.2)  
Senior Notes      
Debt Instrument [Line Items]      
Long-term debt, gross 660.0 685.0  
Senior notes 599.6 614.8  
Senior Notes | 7.875% Senior Notes, Due 2026      
Debt Instrument [Line Items]      
Unamortized debt issuance costs (4.3) (5.7)  
Senior Notes | 12% Paid in Cash or 13.25% Paid in Kind Senior Notes, Due 2027      
Debt Instrument [Line Items]      
Unamortized debt issuance costs $ (7.5) $ (8.6)