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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Operating Revenues        
Other operating revenues $ 6.7 $ 21.9 $ 15.2 $ 44.3
Late payment charges        
Disaggregation of Operating Revenues        
Other operating revenues 16.3 17.3 29.9 32.3
Alternative revenues        
Disaggregation of Operating Revenues        
Other operating revenues (11.3) 2.9 (17.3) 9.1
Other        
Disaggregation of Operating Revenues        
Other operating revenues $ 1.7 $ 1.7 $ 2.6 $ 2.9