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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Pension    
Pension and Other Postretirement Benefit Plans [Line Items]    
Employer contributions $ 25.0 $ 6.5
Expected future employer contributions 0.0  
Other Postretirement    
Pension and Other Postretirement Benefit Plans [Line Items]    
Employer contributions 0.0 $ 0.0
Expected future employer contributions $ 0.0