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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($) $ in Millions | 3 Months Ended
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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

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- Definition Amount of revenue that is not accounted for under Topic 606. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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