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Fair Value Measurements - Convertible Notes at Fair Value (Details)
$ in Millions
1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 21, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jul. 21, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value Measurements            
Increase decrease in fair value of convertible notes $ 2.6 $ (0.7) $ (3.5) $ 29.3    
Principal amount outstanding under the convertible notes         $ 111.0 $ 67.5
Estimated fair value of convertible notes         $ 131.3 $ 86.4
Convertible notes, measurement input, extensible enumeration   Discount rate   Discount rate Discount rate  
Minimum | Discount rate            
Fair Value Measurements            
Convertible notes, measurement input         0.20 0.15
Minimum | Discount rate | Predecessor period, July 1, 2023, to July 21, 2023            
Fair Value Measurements            
Convertible notes, measurement input 0.15   0.15      
Minimum | Discount rate | Predecessor period, January 1, 2023, to July 21, 2023            
Fair Value Measurements            
Convertible notes, measurement input 0.15   0.15      
Maximum | Discount rate            
Fair Value Measurements            
Convertible notes, measurement input         0.40 0.28
Maximum | Discount rate | Predecessor period, July 1, 2023, to July 21, 2023            
Fair Value Measurements            
Convertible notes, measurement input 0.40   0.40      
Maximum | Discount rate | Predecessor period, January 1, 2023, to July 21, 2023            
Fair Value Measurements            
Convertible notes, measurement input 0.45   0.45