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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | $ 20.0 | $ 6.7 | $ 49.9 | $ 15.2
Late payment charges |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 16.2 | 16.3 | 33.4 | 29.9
Alternative revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 2.1 | (11.3) | 13.9 | (17.3)
Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | $ 1.7 | $ 1.7 | $ 2.6 | $ 2.6

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