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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Operating Revenues |  |  |  |
Operating revenues | $ 1,643.7 | $ 1,657.5 | $ 5,602.7 | $ 5,593.5
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Operating revenues | 8.0 |  | 3.4 |
Other operating revenues | Alternative revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Operating revenues | (1.9) |  | (32.2) |
Other operating revenues | Late payment charges |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Operating revenues | 9.4 |  | 31.9 |
Other operating revenues | Leases |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Operating revenues | $ 0.5 |  | $ 3.7 |

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