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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Operating Revenues    
Other operating revenues $ 21.7 $ 0.9
Late payment charges    
Disaggregation of Operating Revenues    
Other operating revenues 12.1 13.2
Alternative revenues    
Disaggregation of Operating Revenues    
Other operating revenues 8.5 (19.7)
Other    
Disaggregation of Operating Revenues    
Other operating revenues $ 1.1 $ 7.4