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BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2023
Aug. 12, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Contribution Plan [Line Items]          
Benefit payment term     10 years    
Healthcare cost trend rate assumed for next year 5.60% 5.70% 5.60% 6.00%  
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.20% 4.20% 4.20% 4.00%  
Expected future employer contributions $ 28.4   $ 28.4    
Expected future reimbursement 20.0   $ 20.0    
Defined contribution plan, cost 2.4 $ 4.0   $ 7.0 $ 7.4
Retirement savings plan basic match     50.00%    
Employee Contributions First Six Percent          
Defined Contribution Plan [Line Items]          
Participant contribution percentage     6.00%    
Pension Plan          
Defined Contribution Plan [Line Items]          
Employer contributions     $ 8.3    
Reimbursement from CTA     22.8    
Other Benefits          
Defined Contribution Plan [Line Items]          
Employer contributions 0.6 $ 0.6   $ 0.5  
Expected future contributions $ 0.5   $ 0.5