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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Operating Revenues    
Other operating revenues $ 29.9 $ 8.5
Late payment charges    
Disaggregation of Operating Revenues    
Other operating revenues 17.2 13.6
Alternative revenues    
Disaggregation of Operating Revenues    
Other operating revenues 11.8 (6.0)
Other    
Disaggregation of Operating Revenues    
Other operating revenues $ 0.9 $ 0.9