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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | $ 15.7 | $ 9.2 | $ 73.9 | $ 113.5
Late payment charges |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 10.4 | 10.4 | 38.1 | 39.1
Alternative revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (9.6) | (1.7) | (9.6) | 71.1
Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | $ 14.9 | $ 0.5 | $ 45.4 | $ 3.3

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