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Fair Value Measurements - Convertible Notes at Fair Value (Details)
$ in Millions
3 Months Ended 7 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Jul. 21, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
Fair Value Measurements          
Increase decrease in fair value of convertible notes $ 0.1 $ 4.7 $ 19.4 $ 4.4  
Principal amount outstanding under the convertible notes 5.0 0.0   111.0  
Estimated fair value of convertible notes $ 5.1 $ 0.0   $ 131.3  
Convertible notes, measurement input, extensible enumeration Discount rate Discount rate     Discount rate
Discount rate          
Fair Value Measurements          
Convertible notes, measurement input 60 20      
Minimum | Discount rate | Predecessor period, July 1, 2023, to July 21, 2023          
Fair Value Measurements          
Convertible notes, measurement input     0.15    
Minimum | Discount rate | Predecessor period, January 1, 2023, to July 21, 2023          
Fair Value Measurements          
Convertible notes, measurement input     0.15    
Maximum | Discount rate | Predecessor period, July 1, 2023, to July 21, 2023          
Fair Value Measurements          
Convertible notes, measurement input     0.40    
Maximum | Discount rate | Predecessor period, January 1, 2023, to July 21, 2023          
Fair Value Measurements          
Convertible notes, measurement input     0.45